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freebsd/libexec/rtld-aout/rtld.c

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Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/*
* Copyright (c) 1993 Paul Kranenburg
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Paul Kranenburg.
* 4. The name of the author may not be used to endorse or promote products
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
* derived from this software without specific prior written permission
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
Fix a bug in the handling of minor version numbers. Formerly, the rtld would accept the first shared library it found with the right major version number, even if the minor version number was too low. If a different version of the shared library with an adequate minor version number appeared later in the search path, it would not be found. Now the rtld searches all locations first looking for a library with a minor version that is high enough. Only if such a library is not found will it fall back to accepting a minor version number that is too low. As before, a warning comes out in that case. This solves some problems encountered when building an older world on a -current system.
1998-11-07 01:59:39 +00:00
* $Id: rtld.c,v 1.56 1998/08/22 15:51:41 mckay Exp $
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
*/
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/resource.h>
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#include <sys/errno.h>
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#include <sys/mman.h>
Weak symbol support from NetBSD. This should bring us in sync with the NetBSD ld code except for local changes for dlopen() and friends and the hashing on the minor value of the shlibs. We should be binary compatible now with all their libraries. Obtained from: NetBSD
1995-03-04 17:49:20 +00:00
#ifndef MAP_COPY
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#define MAP_COPY MAP_PRIVATE
#endif
Use the RTLD_NOW symbol, now that it is defined in <dlfcn.h>.
1997-01-12 19:59:26 +00:00
#include <dlfcn.h>
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
#include <err.h>
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#include <fcntl.h>
#include <a.out.h>
#include <stab.h>
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
#include <stdio.h>
#include <stdlib.h>
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#include <string.h>
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
#include <unistd.h>
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
#include <link.h>
#include "md.h"
#include "shlib.h"
#include "support.h"
#include "dynamic.h"
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Weak symbol support from NetBSD. This should bring us in sync with the NetBSD ld code except for local changes for dlopen() and friends and the hashing on the minor value of the shlibs. We should be binary compatible now with all their libraries. Obtained from: NetBSD
1995-03-04 17:49:20 +00:00
#ifndef MAP_ANON
#define MAP_ANON 0
#define anon_open() do { \
if ((anon_fd = open("/dev/zero", O_RDWR, 0)) == -1) \
err("open: %s", "/dev/zero"); \
} while (0)
#define anon_close() do { \
(void)close(anon_fd); \
anon_fd = -1; \
} while (0)
#else
#define anon_open()
#define anon_close()
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#endif
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/*
* Structure for building a list of shared objects.
*/
struct so_list {
struct so_map *sol_map; /* Link map for shared object */
struct so_list *sol_next; /* Next entry in the list */
};
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/*
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
* Loader private data, hung off <so_map>->som_spd
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
*/
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct somap_private {
int spd_version;
struct so_map *spd_parent;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
struct so_list *spd_children;
struct so_map *spd_prev;
When checking to see whether a needed shared library has already been loaded, look for a match by device and inode number if the traditional pathname comparisons don't find a match. This detects the case in which a library is requested using two different names which are really links to the same file, and avoids loading it twice. Requested by: peter@freebsd.org Reviewed by: peter@freebsd.org
1996-05-22 06:34:12 +00:00
dev_t spd_dev;
ino_t spd_ino;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
int spd_refcount;
int spd_flags;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
#define RTLD_MAIN 0x01
#define RTLD_RTLD 0x02
#define RTLD_DL 0x04
#define RTLD_INIT 0x08
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
unsigned long a_text; /* text size, if known */
unsigned long a_data; /* initialized data size */
unsigned long a_bss; /* uninitialized data size */
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#ifdef SUN_COMPAT
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
long spd_offset; /* Correction for Sun main programs */
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#endif
};
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#define LM_PRIVATE(smp) ((struct somap_private *)(smp)->som_spd)
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#ifdef SUN_COMPAT
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#define LM_OFFSET(smp) (LM_PRIVATE(smp)->spd_offset)
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#else
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#define LM_OFFSET(smp) (0)
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#endif
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
/* Base address for section_dispatch_table entries */
#define LM_LDBASE(smp) (smp->som_addr + LM_OFFSET(smp))
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/* Start of text segment */
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#define LM_TXTADDR(smp) (smp->som_addr == (caddr_t)0 ? PAGSIZ : 0)
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/* Start of run-time relocation_info */
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#define LM_REL(smp) ((struct relocation_info *) \
(smp->som_addr + LM_OFFSET(smp) + LD_REL((smp)->som_dynamic)))
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/* Start of symbols */
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#define LM_SYMBOL(smp, i) ((struct nzlist *) \
(smp->som_addr + LM_OFFSET(smp) + LD_SYMBOL((smp)->som_dynamic) + \
i * (LD_VERSION_NZLIST_P(smp->som_dynamic->d_version) ? \
sizeof(struct nzlist) : sizeof(struct nlist))))
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/* Start of hash table */
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#define LM_HASH(smp) ((struct rrs_hash *) \
((smp)->som_addr + LM_OFFSET(smp) + LD_HASH((smp)->som_dynamic)))
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/* Start of strings */
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#define LM_STRINGS(smp) ((char *) \
((smp)->som_addr + LM_OFFSET(smp) + LD_STRINGS((smp)->som_dynamic)))
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
/* Start of search paths */
#define LM_PATHS(smp) ((char *) \
((smp)->som_addr + LM_OFFSET(smp) + LD_PATHS((smp)->som_dynamic)))
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/* End of text */
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#define LM_ETEXT(smp) ((char *) \
((smp)->som_addr + LM_TXTADDR(smp) + LD_TEXTSZ((smp)->som_dynamic)))
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Sync. up bits with Paul K. Cascade support plus some cosmetic changes. Obtained from: NetBSD
1995-04-21 04:57:50 +00:00
/* Needed shared objects */
#define LM_NEED(smp) ((struct sod *) \
((smp)->som_addr + LM_TXTADDR(smp) + LD_NEED((smp)->som_dynamic)))
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/* PLT is in data segment, so don't use LM_OFFSET here */
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#define LM_PLT(smp) ((jmpslot_t *) \
((smp)->som_addr + LD_PLT((smp)->som_dynamic)))
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/* Parent of link map */
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#define LM_PARENT(smp) (LM_PRIVATE(smp)->spd_parent)
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Sigh, oh well, here's my obligigatory "oops" commit. I don't quite know how I managed to get this out of sync, but I did. I guess that's what I get for directly committing from different machines that I was testing on. Pointed out by: Paul Traina <pst@freebsd.org>
1996-10-01 11:54:38 +00:00
#ifndef RELOC_EXTERN_P
#define RELOC_EXTERN_P(s) ((s)->r_extern)
#endif
#ifndef RELOC_SYMBOL
#define RELOC_SYMBOL(s) ((s)->r_symbolnum)
#endif
#ifndef RELOC_PCREL_P
#define RELOC_PCREL_P(s) ((s)->r_pcrel)
#endif
Implement dladdr.
1998-02-06 16:46:46 +00:00
#define END_SYM "_end"
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
static char __main_progname[] = "main";
static char *main_progname = __main_progname;
static char us[] = "/usr/libexec/ld.so";
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
char **environ;
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
char *__progname;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
int errno;
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
static uid_t uid, euid;
static gid_t gid, egid;
static int careful;
Weak symbol support from NetBSD. This should bring us in sync with the NetBSD ld code except for local changes for dlopen() and friends and the hashing on the minor value of the shlibs. We should be binary compatible now with all their libraries. Obtained from: NetBSD
1995-03-04 17:49:20 +00:00
static int anon_fd = -1;
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
static char *ld_bind_now;
Pay attention to the environment variable "LD_IGNORE_MISSING_OBJECTS". If it is set to a nonempty string, then simply skip any missing shared libraries. This came up in a discussion long ago as a potentially useful feature at sysinstall time. For example, an X11 utility could be used without the X libraries being present, provided the utility had a mode in which no X functions were actually called.
1997-01-17 20:22:18 +00:00
static char *ld_ignore_missing_objects;
Changed the terminology for what used to be called the "memorizing" vector. Now it is called the "symbol caching" vector. This was made possible and unconfusing by other changes that allowed me to localize everything having to do with the caching vector in the function reloc_map(). Switched to alloca() for allocating the caching vector, and eliminated the special mmap-based allocation routines. Although this was motivated by performance reasons, it led to significant simplification of the code, and made it possible to confine the symbol caching code to the single function reloc_map(). Got rid of the unnecessary and inefficient division loop at the beginning of rtld(). Reduced the number of calls to getenv("LD_LIBRARY_PATH") to just 1, on suggestion from <davidg@root.com>. Added breaks out of the relocation loops when the relocation address is found to be 0. A relocation address of 0 is caused by an unused relocation entry. Unused relocation entries are caused by linking a shared object with the "-Bsymbolic" switch. The runtime linker itself is linked that way, and the last 40% of its relocation entries are unused. Thus, breaking out of the loop on the first such entry is a performance win when ld.so relocates itself. As a side benefit, it permits removing a test from md_relocate_simple() in ../i386/md-static-funcs.c. Unused relocation entries in other shared objects (linked with "-Bsymbolic") caused even bigger problems in previous versions of the runtime linker. The runtime linker interpreted the unused entries as if they were valid. That caused it to perform repeated relocations of the first byte of the shared object. In order to do that, it had to remap the text segment writable. Breaking out of the loop on the first unused relocation entry solves that. Submitted by: John Polstra <jdp@polstra.com>
1995-11-02 18:48:15 +00:00
static char *ld_library_path;
Implement support for LD_PRELOAD in the dynamic linker. Remove descriptions of LD_NO_INTERN_SEARCH and LD_NOSTD_PATH from the manual page, since they are not supported. Submitted by: Doug Ambrisko <ambrisko@ambrisko.roble.com>
1996-04-20 18:29:50 +00:00
static char *ld_preload;
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
static char *ld_tracing;
static char *ld_suppress_warnings;
static char *ld_warn_non_pure_code;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
struct so_map *link_map_head;
struct so_map *link_map_tail;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
struct rt_symbol *rt_symbol_head;
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void *__dlopen __P((const char *, int));
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
static int __dlclose __P((void *));
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void *__dlsym __P((void *, const char *));
static const char *__dlerror __P((void));
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
static void __dlexit __P((void));
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void *__dlsym3 __P((void *, const char *, void *));
Implement dladdr.
1998-02-06 16:46:46 +00:00
static int __dladdr __P((const void *, Dl_info *));
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
static struct ld_entry ld_entry = {
Implement dladdr.
1998-02-06 16:46:46 +00:00
__dlopen, __dlclose, __dlsym, __dlerror, __dlexit, __dlsym3, __dladdr
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
};
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
void xprintf __P((char *, ...));
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static struct so_map *map_object __P(( const char *,
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
struct sod *,
struct so_map *));
Implement support for LD_PRELOAD in the dynamic linker. Remove descriptions of LD_NO_INTERN_SEARCH and LD_NOSTD_PATH from the manual page, since they are not supported. Submitted by: Doug Ambrisko <ambrisko@ambrisko.roble.com>
1996-04-20 18:29:50 +00:00
static int map_preload __P((void));
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
static int map_sods __P((struct so_map *));
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static int reloc_dag __P((struct so_map *, int));
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
static void unmap_object __P((struct so_map *, int));
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static struct so_map *alloc_link_map __P(( const char *, struct sod *,
struct so_map *, caddr_t,
struct _dynamic *));
static void init_link_map __P(( struct so_map *,
struct somap_private *,
const char *, struct sod *,
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct so_map *, caddr_t,
struct _dynamic *));
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
static void free_link_map __P((struct so_map *));
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
static inline int check_text_reloc __P(( struct relocation_info *,
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct so_map *,
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
caddr_t));
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
static int reloc_map __P((struct so_map *, int));
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
static void reloc_copy __P((struct so_map *));
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void init_dag __P((struct so_map *));
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
static void init_sods __P((struct so_list *));
Make emacs work again. This is a workaround for the fact that the emacs a.out file, self-generated by emacs's "unexec" function in "unexsunos4.c", is invalid. In particular, its "_end" symbol has the wrong value. The dynamic linker was using the value of that symbol to initialize its sbrk break level. The workaround is to peek at the executable's a.out header in memory, and calculate what "_end" should be based on the segment sizes. I will work out a fix for emacs and send it to the FSF. This dynamic linker workaround is still worthwhile, if only to avoid forcing all emacs users to build a new version. Note: xemacs gives a bogus warning at startup, for related reasons. The warning is harmless and can safely be ignored. I will send a patch to the xemacs maintainers to get rid of it, and meanwhile add a patch file to our port.
1997-12-05 02:06:37 +00:00
static void init_internal_malloc __P((void));
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void init_external_malloc __P((void));
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
static int call_map __P((struct so_map *, char *));
static char *findhint __P((char *, int, int *));
Fix a bug in the handling of minor version numbers. Formerly, the rtld would accept the first shared library it found with the right major version number, even if the minor version number was too low. If a different version of the shared library with an adequate minor version number appeared later in the search path, it would not be found. Now the rtld searches all locations first looking for a library with a minor version that is high enough. Only if such a library is not found will it fall back to accepting a minor version number that is too low. As before, a warning comes out in that case. This solves some problems encountered when building an older world on a -current system.
1998-11-07 01:59:39 +00:00
static char *rtfindlib __P((char *, int, int, int));
Search for libraries in dlopen() when the specified path contains no ``/''s. Elf already searches it seems. Mostly submitted by: Mike Smith <mike@smith.net.au>
1998-06-07 03:53:08 +00:00
static char *rtfindfile __P((const char *));
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
void binder_entry __P((void));
long binder __P((jmpslot_t *));
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
static struct nzlist *lookup __P((char *, struct so_map **, int));
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static inline struct rt_symbol *lookup_rts __P((char *, unsigned long));
static struct nzlist *lookup_in_obj __P((char *, unsigned long,
struct so_map *, int));
static struct rt_symbol *enter_rts __P((char *, unsigned long, long, int,
caddr_t, long, struct so_map *));
static void *sym_addr __P((char *));
Since I got no objections to this patch, and no one has offered any alternative, I present .. ta! da! .. the __error() hack. This patch to the a.out dynamic loader provides old a.out binaries with __error() if they are linked with an older libc that lacks it, but are also linked against a library that needs it. There is a smaller, tricker hack that takes advantage of the fact that ld.so has __error() too, courtesy of the new libc, but this hack is the straightforward version.
1998-06-21 14:22:29 +00:00
static struct nzlist * lookup_errno_hack(char *, struct so_map **, int);
If errors occur during the loading of the shared libraries required by the main program, report them directly from the dynamic linker and die there, rather than returning an error message to crt0.o. This enables the printing of error messages even for old executables, whose version of crt0.o is not able to print them. This fix closes PR bin/1869. The code in crt0.o for printing error messages from the dynamic linker is no longer used, because of this change. But it must remain, for backward compatibility with older dynamic linkers.
1996-10-24 16:24:19 +00:00
static void die __P((void));
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
static void generror __P((char *, ...));
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
static int maphints __P((void));
Weak symbol support from NetBSD. This should bring us in sync with the NetBSD ld code except for local changes for dlopen() and friends and the hashing on the minor value of the shlibs. We should be binary compatible now with all their libraries. Obtained from: NetBSD
1995-03-04 17:49:20 +00:00
static void unmaphints __P((void));
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
static void ld_trace __P((struct so_map *));
static void rt_readenv __P((void));
static int hinthash __P((char *, int));
int rtld __P((int, struct crt_ldso *, struct _dynamic *));
Weak symbol support from NetBSD. This should bring us in sync with the NetBSD ld code except for local changes for dlopen() and friends and the hashing on the minor value of the shlibs. We should be binary compatible now with all their libraries. Obtained from: NetBSD
1995-03-04 17:49:20 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
/*
* Compute a hash value for symbol tables. Don't change this -- the
* algorithm is dictated by the way the linker builds the symbol
* tables in the shared objects.
*/
static inline unsigned long
sym_hash(s)
const char *s;
{
unsigned long h;
h = 0;
while (*s != '\0')
h = (h << 1) + *s++;
return h & 0x7fffffffUL;
}
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
static inline int
strcmp (register const char *s1, register const char *s2)
{
while (*s1 == *s2++)
if (*s1++ == 0)
return (0);
return (*(unsigned char *)s1 - *(unsigned char *)--s2);
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#include "md-static-funcs.c"
/*
* Called from assembler stub that has set up crtp (passed from crt0)
* and dp (our __DYNAMIC).
*/
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
int
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
rtld(version, crtp, dp)
int version;
struct crt_ldso *crtp;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct _dynamic *dp;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
struct relocation_info *reloc;
Changed the terminology for what used to be called the "memorizing" vector. Now it is called the "symbol caching" vector. This was made possible and unconfusing by other changes that allowed me to localize everything having to do with the caching vector in the function reloc_map(). Switched to alloca() for allocating the caching vector, and eliminated the special mmap-based allocation routines. Although this was motivated by performance reasons, it led to significant simplification of the code, and made it possible to confine the symbol caching code to the single function reloc_map(). Got rid of the unnecessary and inefficient division loop at the beginning of rtld(). Reduced the number of calls to getenv("LD_LIBRARY_PATH") to just 1, on suggestion from <davidg@root.com>. Added breaks out of the relocation loops when the relocation address is found to be 0. A relocation address of 0 is caused by an unused relocation entry. Unused relocation entries are caused by linking a shared object with the "-Bsymbolic" switch. The runtime linker itself is linked that way, and the last 40% of its relocation entries are unused. Thus, breaking out of the loop on the first such entry is a performance win when ld.so relocates itself. As a side benefit, it permits removing a test from md_relocate_simple() in ../i386/md-static-funcs.c. Unused relocation entries in other shared objects (linked with "-Bsymbolic") caused even bigger problems in previous versions of the runtime linker. The runtime linker interpreted the unused entries as if they were valid. That caused it to perform repeated relocations of the first byte of the shared object. In order to do that, it had to remap the text segment writable. Breaking out of the loop on the first unused relocation entry solves that. Submitted by: John Polstra <jdp@polstra.com>
1995-11-02 18:48:15 +00:00
struct relocation_info *reloc_limit; /* End+1 of relocation */
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct so_debug *ddp;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
struct so_map *main_map;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct so_map *smp;
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
char *add_paths;
Implement dladdr.
1998-02-06 16:46:46 +00:00
char *main_path;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/* Check version */
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
if (version != CRT_VERSION_BSD_2 &&
version != CRT_VERSION_BSD_3 &&
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
version != CRT_VERSION_BSD_4 &&
Implement dladdr.
1998-02-06 16:46:46 +00:00
version != CRT_VERSION_BSD_5 &&
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
version != CRT_VERSION_SUN)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
return -1;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/* Fixup __DYNAMIC structure */
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
(long)dp->d_un.d_sdt += crtp->crt_ba;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/* Relocate ourselves */
Changed the terminology for what used to be called the "memorizing" vector. Now it is called the "symbol caching" vector. This was made possible and unconfusing by other changes that allowed me to localize everything having to do with the caching vector in the function reloc_map(). Switched to alloca() for allocating the caching vector, and eliminated the special mmap-based allocation routines. Although this was motivated by performance reasons, it led to significant simplification of the code, and made it possible to confine the symbol caching code to the single function reloc_map(). Got rid of the unnecessary and inefficient division loop at the beginning of rtld(). Reduced the number of calls to getenv("LD_LIBRARY_PATH") to just 1, on suggestion from <davidg@root.com>. Added breaks out of the relocation loops when the relocation address is found to be 0. A relocation address of 0 is caused by an unused relocation entry. Unused relocation entries are caused by linking a shared object with the "-Bsymbolic" switch. The runtime linker itself is linked that way, and the last 40% of its relocation entries are unused. Thus, breaking out of the loop on the first such entry is a performance win when ld.so relocates itself. As a side benefit, it permits removing a test from md_relocate_simple() in ../i386/md-static-funcs.c. Unused relocation entries in other shared objects (linked with "-Bsymbolic") caused even bigger problems in previous versions of the runtime linker. The runtime linker interpreted the unused entries as if they were valid. That caused it to perform repeated relocations of the first byte of the shared object. In order to do that, it had to remap the text segment writable. Breaking out of the loop on the first unused relocation entry solves that. Submitted by: John Polstra <jdp@polstra.com>
1995-11-02 18:48:15 +00:00
reloc = (struct relocation_info *) (LD_REL(dp) + crtp->crt_ba);
reloc_limit =
(struct relocation_info *) ((char *) reloc + LD_RELSZ(dp));
while(reloc < reloc_limit) {
/*
* Objects linked with "-Bsymbolic" (in particular, ld.so
* itself) can end up having unused relocation entries at
* the end. These can be detected by the fact that they
* have an address of 0.
*/
if(reloc->r_address == 0) /* We're done */
break;
md_relocate_simple(reloc, crtp->crt_ba,
reloc->r_address + crtp->crt_ba);
++reloc;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
if (version >= CRT_VERSION_BSD_4)
__progname = crtp->crt_ldso;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
if (version >= CRT_VERSION_BSD_3)
main_progname = crtp->crt_prog;
Implement dladdr.
1998-02-06 16:46:46 +00:00
main_path = version >= CRT_VERSION_BSD_5 ? crtp->crt_argv[0] :
main_progname;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
/* Some buggy versions of crt0.o have crt_ldso filled in as NULL. */
if (__progname == NULL)
__progname = us;
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
/* Fill in some fields in _DYNAMIC or crt structure */
if (version >= CRT_VERSION_BSD_4)
crtp->crt_ldentry = &ld_entry; /* crt */
else
crtp->crt_dp->d_entry = &ld_entry; /* _DYNAMIC */
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
/* Initialize our internal malloc package. */
Make emacs work again. This is a workaround for the fact that the emacs a.out file, self-generated by emacs's "unexec" function in "unexsunos4.c", is invalid. In particular, its "_end" symbol has the wrong value. The dynamic linker was using the value of that symbol to initialize its sbrk break level. The workaround is to peek at the executable's a.out header in memory, and calculate what "_end" should be based on the segment sizes. I will work out a fix for emacs and send it to the FSF. This dynamic linker workaround is still worthwhile, if only to avoid forcing all emacs users to build a new version. Note: xemacs gives a bogus warning at startup, for related reasons. The warning is harmless and can safely be ignored. I will send a patch to the xemacs maintainers to get rid of it, and meanwhile add a patch file to our port.
1997-12-05 02:06:37 +00:00
init_internal_malloc();
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/* Setup out (private) environ variable */
environ = crtp->crt_ep;
/* Get user and group identifiers */
uid = getuid(); euid = geteuid();
gid = getgid(); egid = getegid();
careful = (uid != euid) || (gid != egid);
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
rt_readenv();
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Weak symbol support from NetBSD. This should bring us in sync with the NetBSD ld code except for local changes for dlopen() and friends and the hashing on the minor value of the shlibs. We should be binary compatible now with all their libraries. Obtained from: NetBSD
1995-03-04 17:49:20 +00:00
anon_open();
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/* Make a link map entry for the main program */
Implement dladdr.
1998-02-06 16:46:46 +00:00
main_map = alloc_link_map(main_path,
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
(struct sod *) NULL, (struct so_map *) NULL,
(caddr_t) 0, crtp->crt_dp);
LM_PRIVATE(main_map)->spd_refcount++;
LM_PRIVATE(main_map)->spd_flags |= RTLD_MAIN;
/* Make a link map entry for ourselves */
smp = alloc_link_map(us,
(struct sod *) NULL, (struct so_map *) NULL,
(caddr_t) crtp->crt_ba, dp);
LM_PRIVATE(smp)->spd_refcount++;
LM_PRIVATE(smp)->spd_flags |= RTLD_RTLD;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
/*
* Setup the executable's run path
*/
if (version >= CRT_VERSION_BSD_4) {
add_paths = LM_PATHS(main_map);
if (add_paths)
add_search_path(add_paths);
}
/*
* Setup the directory search list for findshlib. We use only
* the standard search path. Any extra directories from
* LD_LIBRARY_PATH are searched explicitly, in rtfindlib.
*/
std_search_path();
Fixup the "ld.so failed" message for the case when ld.so finds undefined symbols. An easy example to see this is to develop an X program which links against Xt, but doesn't add -lX11 to the link line. It will link fine, but cause run-time errors by ld.so because of missing symbols used by Xt defined in X11. This patch makes the errors more readable. Submitted by: jdp@polstra.com (John Polstra)
1995-09-27 23:14:08 +00:00
Implement support for LD_PRELOAD in the dynamic linker. Remove descriptions of LD_NO_INTERN_SEARCH and LD_NOSTD_PATH from the manual page, since they are not supported. Submitted by: Doug Ambrisko <ambrisko@ambrisko.roble.com>
1996-04-20 18:29:50 +00:00
/* Map in LD_PRELOADs before the main program's shared objects so we
can intercept those calls */
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
if (ld_preload != NULL) {
Implement support for LD_PRELOAD in the dynamic linker. Remove descriptions of LD_NO_INTERN_SEARCH and LD_NOSTD_PATH from the manual page, since they are not supported. Submitted by: Doug Ambrisko <ambrisko@ambrisko.roble.com>
1996-04-20 18:29:50 +00:00
if(map_preload() == -1) /* Failed */
If errors occur during the loading of the shared libraries required by the main program, report them directly from the dynamic linker and die there, rather than returning an error message to crt0.o. This enables the printing of error messages even for old executables, whose version of crt0.o is not able to print them. This fix closes PR bin/1869. The code in crt0.o for printing error messages from the dynamic linker is no longer used, because of this change. But it must remain, for backward compatibility with older dynamic linkers.
1996-10-24 16:24:19 +00:00
die();
Implement support for LD_PRELOAD in the dynamic linker. Remove descriptions of LD_NO_INTERN_SEARCH and LD_NOSTD_PATH from the manual page, since they are not supported. Submitted by: Doug Ambrisko <ambrisko@ambrisko.roble.com>
1996-04-20 18:29:50 +00:00
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/* Map all the shared objects that the main program depends upon */
if(map_sods(main_map) == -1)
If errors occur during the loading of the shared libraries required by the main program, report them directly from the dynamic linker and die there, rather than returning an error message to crt0.o. This enables the printing of error messages even for old executables, whose version of crt0.o is not able to print them. This fix closes PR bin/1869. The code in crt0.o for printing error messages from the dynamic linker is no longer used, because of this change. But it must remain, for backward compatibility with older dynamic linkers.
1996-10-24 16:24:19 +00:00
die();
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
if(ld_tracing) { /* We're done */
ld_trace(link_map_head);
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
exit(0);
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
}
crtp->crt_dp->d_un.d_sdt->sdt_loaded = link_map_head->som_next;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
/* Relocate all mapped objects. */
if(reloc_dag(main_map, ld_bind_now != NULL) == -1) /* Failed */
If errors occur during the loading of the shared libraries required by the main program, report them directly from the dynamic linker and die there, rather than returning an error message to crt0.o. This enables the printing of error messages even for old executables, whose version of crt0.o is not able to print them. This fix closes PR bin/1869. The code in crt0.o for printing error messages from the dynamic linker is no longer used, because of this change. But it must remain, for backward compatibility with older dynamic linkers.
1996-10-24 16:24:19 +00:00
die();
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
/*
* Switch to the same malloc that the program uses. We do
* this before initializing the loaded objects, because their
* initialization functions may well call malloc, and it won't
* work right until we have set it up.
*/
init_external_malloc();
/* Initialize all mapped objects. */
init_dag(main_map);
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
ddp = crtp->crt_dp->d_debug;
ddp->dd_cc = rt_symbol_head;
if (ddp->dd_in_debugger) {
Some of the latest changes from Paul K (taken from NetBSD-current).
1993-11-22 19:05:31 +00:00
caddr_t addr = (caddr_t)((long)crtp->crt_bp & (~(PAGSIZ - 1)));
/* Set breakpoint for the benefit of debuggers */
if (mprotect(addr, PAGSIZ,
PROT_READ|PROT_WRITE|PROT_EXEC) == -1) {
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
err(1, "Cannot set breakpoint (%s)", main_progname);
Some of the latest changes from Paul K (taken from NetBSD-current).
1993-11-22 19:05:31 +00:00
}
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
md_set_breakpoint((long)crtp->crt_bp, (long *)&ddp->dd_bpt_shadow);
Some of the latest changes from Paul K (taken from NetBSD-current).
1993-11-22 19:05:31 +00:00
if (mprotect(addr, PAGSIZ, PROT_READ|PROT_EXEC) == -1) {
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
err(1, "Cannot re-protect breakpoint (%s)",
main_progname);
Some of the latest changes from Paul K (taken from NetBSD-current).
1993-11-22 19:05:31 +00:00
}
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
ddp->dd_bpt_addr = crtp->crt_bp;
Some of the latest changes from Paul K (taken from NetBSD-current).
1993-11-22 19:05:31 +00:00
if (link_map_head)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
ddp->dd_sym_loaded = 1;
Some of the latest changes from Paul K (taken from NetBSD-current).
1993-11-22 19:05:31 +00:00
}
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
Weak symbol support from NetBSD. This should bring us in sync with the NetBSD ld code except for local changes for dlopen() and friends and the hashing on the minor value of the shlibs. We should be binary compatible now with all their libraries. Obtained from: NetBSD
1995-03-04 17:49:20 +00:00
/* Close the hints file */
Unmap hints file when finished with it, so that it can go away completely when ldconfig unlinks it. If init is shared, then the referenced unlinked copy of the hints file created by running ldconfig in /etc/rc caused the file system to be unclean after every reboot.
1994-09-15 20:48:55 +00:00
unmaphints();
Many recent fixes from Paul K, add support for chaining of shared lib deps.
1993-11-30 20:47:54 +00:00
/* Close our file descriptor */
(void)close(crtp->crt_ldfd);
Weak symbol support from NetBSD. This should bring us in sync with the NetBSD ld code except for local changes for dlopen() and friends and the hashing on the minor value of the shlibs. We should be binary compatible now with all their libraries. Obtained from: NetBSD
1995-03-04 17:49:20 +00:00
anon_close();
Run-time linker speedups - Round One Implemented symbol memorizing to reduce the number of calls to lookup(), making relocation go faster. While relocating a given shared object, the dynamic linker maintains a memorizing vector that is directly indexed by the symbol number in the relocation entry. The first time a given symbol is looked up, the memorizing vector is filled in with a pointer to the symbol table entry, and a pointer to the so_map of the shared object in which the symbol was defined. On subsequent uses of the same symbol, that information is retrieved directly from the memorizing vector, without calling lookup() again. A symbol that is referenced in a relocation entry is typically referenced in many relocation entries, so this memorizing reduces the number of calls to lookup() dramatically. The overall improvement in the speed of dynamic linking is also dramatic -- as much as a factor of three for programs that use many shared libaries. Submitted by: jdp@polstra.com "John Polstra"
1995-10-25 16:16:35 +00:00
Implement dladdr.
1998-02-06 16:46:46 +00:00
return LDSO_VERSION_HAS_DLADDR;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
void
ld_trace(smp)
struct so_map *smp;
{
char *fmt1, *fmt2, *fmt, *main_local;
int c;
if ((main_local = getenv("LD_TRACE_LOADED_OBJECTS_PROGNAME")) == NULL)
main_local = "";
if ((fmt1 = getenv("LD_TRACE_LOADED_OBJECTS_FMT1")) == NULL)
fmt1 = "\t-l%o.%m => %p (%x)\n";
if ((fmt2 = getenv("LD_TRACE_LOADED_OBJECTS_FMT2")) == NULL)
fmt2 = "\t%o (%x)\n";
for (; smp; smp = smp->som_next) {
struct sod *sodp;
char *name, *path;
if ((sodp = smp->som_sod) == NULL)
continue;
name = (char *)sodp->sod_name;
if (LM_PARENT(smp))
name += (long)LM_LDBASE(LM_PARENT(smp));
if ((path = smp->som_path) == NULL)
path = "not found";
fmt = sodp->sod_library ? fmt1 : fmt2;
while ((c = *fmt++) != '\0') {
switch (c) {
default:
putchar(c);
continue;
case '\\':
switch (c = *fmt) {
case '\0':
continue;
case 'n':
putchar('\n');
break;
case 't':
putchar('\t');
break;
}
break;
case '%':
switch (c = *fmt) {
case '\0':
continue;
case '%':
default:
putchar(c);
break;
case 'A':
printf("%s", main_local);
break;
case 'a':
printf("%s", main_progname);
break;
case 'o':
printf("%s", name);
break;
case 'm':
printf("%d", sodp->sod_major);
break;
case 'n':
printf("%d", sodp->sod_minor);
break;
case 'p':
printf("%s", path);
break;
case 'x':
printf("%p", smp->som_addr);
break;
}
break;
}
++fmt;
}
}
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/*
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
* Allocate a new link map and return a pointer to it.
*
* PATH is the pathname of the shared object.
*
* SODP is a pointer to the shared object dependency structure responsible
* for causing the new object to be loaded. PARENT is the shared object
* into which SODP points. Both can be NULL if the new object is not
* being loaded as a result of a shared object dependency.
*
* ADDR is the address at which the object has been mapped. DP is a pointer
* to its _dynamic structure.
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static struct so_map *
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
alloc_link_map(path, sodp, parent, addr, dp)
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
const char *path;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct sod *sodp;
struct so_map *parent;
caddr_t addr;
struct _dynamic *dp;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct so_map *smp;
struct somap_private *smpp;
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
#ifdef DEBUG /* { */
xprintf("alloc_link_map: \"%s\" at %p\n", path, addr);
#endif /* } */
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
smp = (struct so_map *)xmalloc(sizeof(struct so_map));
smpp = (struct somap_private *)xmalloc(sizeof(struct somap_private));
init_link_map(smp, smpp, path, sodp, parent, addr, dp);
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/* Link the new entry into the list of link maps */
smpp->spd_prev = link_map_tail;
if(link_map_tail == NULL) /* First link map entered into list */
link_map_head = link_map_tail = smp;
else { /* Append to end of list */
link_map_tail->som_next = smp;
link_map_tail = smp;
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
return smp;
}
/*
* Initialize a link map entry that has already been allocated.
*/
static void
init_link_map(smp, smpp, path, sodp, parent, addr, dp)
struct so_map *smp;
struct somap_private *smpp;
const char *path;
struct sod *sodp;
struct so_map *parent;
caddr_t addr;
struct _dynamic *dp;
{
memset(smp, 0, sizeof *smp);
memset(smpp, 0, sizeof *smpp);
smp->som_spd = (caddr_t)smpp;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
smp->som_addr = addr;
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
smp->som_path = path ? strdup(path) : NULL;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
smp->som_sod = sodp;
smp->som_dynamic = dp;
smpp->spd_parent = parent;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#ifdef SUN_COMPAT
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
smpp->spd_offset =
(addr==0 && dp && dp->d_version==LD_VERSION_SUN) ? PAGSIZ : 0;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#endif
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/*
* Remove the specified link map entry from the list of link maps, and free
* the associated storage.
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
free_link_map(smp)
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
struct so_map *smp;
{
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
struct somap_private *smpp = LM_PRIVATE(smp);
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
#ifdef DEBUG /* { */
xprintf("free_link_map: \"%s\"\n", smp->som_path);
#endif /* } */
if(smpp->spd_prev == NULL) /* Removing first entry in list */
link_map_head = smp->som_next;
else /* Update link of previous entry */
smpp->spd_prev->som_next = smp->som_next;
if(smp->som_next == NULL) /* Removing last entry in list */
link_map_tail = smpp->spd_prev;
else /* Update back link of next entry */
LM_PRIVATE(smp->som_next)->spd_prev = smpp->spd_prev;
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
if (smp->som_path != NULL)
free(smp->som_path);
free(smpp);
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
free(smp);
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/*
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
* Map the shared object specified by PATH into memory, if it is not
* already mapped. Increment the object's reference count, and return a
* pointer to its link map.
*
* As a special case, if PATH is NULL, it is taken to refer to the main
* program.
Make the error message more readable when 'ld.so' cannot locate a needed shared library. Formerly, the message looked like this: ld.so: run: libjdp1.so.1.0: Undefined error: 0 The new message looks like this: ld.so: run: Can't find shared library "libjdp1.so.1.0" (Where "run" is the name of the program being executed.) Submitted by: jdp@polstra.com (John Polstra)
1995-09-27 23:17:33 +00:00
*
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
* SODP is a pointer to the shared object dependency structure that caused
* this object to be requested. PARENT is a pointer to the link map of
* the shared object containing that structure. For a shared object not
* being mapped as a result of a shared object dependency, these pointers
* should be NULL. An example of this is a shared object that is explicitly
* loaded via dlopen().
*
* The return value is a pointer to the link map for the requested object.
* If the operation failed, the return value is NULL. In that case, an
* error message can be retrieved by calling dlerror().
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static struct so_map *
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
map_object(path, sodp, parent)
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
const char *path;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct sod *sodp;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
struct so_map *parent;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
struct so_map *smp;
When checking to see whether a needed shared library has already been loaded, look for a match by device and inode number if the traditional pathname comparisons don't find a match. This detects the case in which a library is requested using two different names which are really links to the same file, and avoids loading it twice. Requested by: peter@freebsd.org Reviewed by: peter@freebsd.org
1996-05-22 06:34:12 +00:00
struct stat statbuf;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if(path == NULL) /* Special case for the main program itself */
smp = link_map_head;
else {
When checking to see whether a needed shared library has already been loaded, look for a match by device and inode number if the traditional pathname comparisons don't find a match. This detects the case in which a library is requested using two different names which are really links to the same file, and avoids loading it twice. Requested by: peter@freebsd.org Reviewed by: peter@freebsd.org
1996-05-22 06:34:12 +00:00
/*
* Check whether the shared object is already mapped.
* We check first for an exact match by pathname. That
* will detect the usual case. If no match is found by
* pathname, then stat the file, and check for a match by
* device and inode. That will detect the less common case
* involving multiple links to the same library.
*/
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
for(smp = link_map_head; smp != NULL; smp = smp->som_next) {
if(!(LM_PRIVATE(smp)->spd_flags & (RTLD_MAIN|RTLD_RTLD))
&& smp->som_path != NULL
&& strcmp(smp->som_path, path) == 0)
break;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
}
When checking to see whether a needed shared library has already been loaded, look for a match by device and inode number if the traditional pathname comparisons don't find a match. This detects the case in which a library is requested using two different names which are really links to the same file, and avoids loading it twice. Requested by: peter@freebsd.org Reviewed by: peter@freebsd.org
1996-05-22 06:34:12 +00:00
if(smp == NULL) { /* Check for a match by device and inode */
if (stat(path, &statbuf) == -1) {
generror ("cannot stat \"%s\" : %s",
path, strerror(errno));
return NULL;
}
for (smp = link_map_head; smp != NULL;
smp = smp->som_next) {
struct somap_private *smpp = LM_PRIVATE(smp);
if (!(smpp->spd_flags & (RTLD_MAIN | RTLD_RTLD))
&& smpp->spd_ino == statbuf.st_ino
&& smpp->spd_dev == statbuf.st_dev)
break;
}
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
}
if (smp == NULL) { /* We must map the object */
struct _dynamic *dp;
int fd;
caddr_t addr;
struct exec hdr;
struct somap_private *smpp;
if ((fd = open(path, O_RDONLY, 0)) == -1) {
generror ("open failed for \"%s\" : %s",
path, strerror (errno));
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
return NULL;
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if (read(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) {
generror ("header read failed for \"%s\"", path);
(void)close(fd);
return NULL;
}
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if (N_BADMAG(hdr)) {
generror ("bad magic number in \"%s\"", path);
(void)close(fd);
return NULL;
}
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/*
* Map the entire address space of the object. It is
* tempting to map just the text segment at first, in
* order to avoid having to use mprotect to change the
* protections of the data segment. But that would not
* be correct. Mmap might find a group of free pages
* large enough to hold the text segment, but not large
* enough for the entire object. When we then mapped
* in the data and BSS segments, they would either be
* non-contiguous with the text segment (if we didn't
* specify MAP_FIXED), or they would map over some
* previously mapped region (if we did use MAP_FIXED).
* The only way we can be sure of getting a contigous
* region that is large enough is to map the entire
* region at once.
*/
if ((addr = mmap(0, hdr.a_text + hdr.a_data + hdr.a_bss,
PROT_READ|PROT_EXEC,
MAP_COPY, fd, 0)) == (caddr_t)-1) {
generror ("mmap failed for \"%s\" : %s",
path, strerror (errno));
(void)close(fd);
return NULL;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
(void)close(fd);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/* Change the data segment to writable */
if (mprotect(addr + hdr.a_text, hdr.a_data,
PROT_READ|PROT_WRITE|PROT_EXEC) != 0) {
generror ("mprotect failed for \"%s\" : %s",
path, strerror (errno));
(void)munmap(addr, hdr.a_text + hdr.a_data + hdr.a_bss);
return NULL;
}
/* Map in pages of zeros for the BSS segment */
if (mmap(addr + hdr.a_text + hdr.a_data, hdr.a_bss,
PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_ANON|MAP_COPY|MAP_FIXED,
anon_fd, 0) == (caddr_t)-1) {
generror ("mmap failed for \"%s\" : %s",
path, strerror (errno));
(void)munmap(addr, hdr.a_text + hdr.a_data + hdr.a_bss);
return NULL;
}
/* Assume _DYNAMIC is the first data item */
dp = (struct _dynamic *)(addr+hdr.a_text);
/* Fixup __DYNAMIC structure */
(long)dp->d_un.d_sdt += (long)addr;
smp = alloc_link_map(path, sodp, parent, addr, dp);
/* save segment sizes for unmap. */
smpp = LM_PRIVATE(smp);
smpp->a_text = hdr.a_text;
smpp->a_data = hdr.a_data;
smpp->a_bss = hdr.a_bss;
When checking to see whether a needed shared library has already been loaded, look for a match by device and inode number if the traditional pathname comparisons don't find a match. This detects the case in which a library is requested using two different names which are really links to the same file, and avoids loading it twice. Requested by: peter@freebsd.org Reviewed by: peter@freebsd.org
1996-05-22 06:34:12 +00:00
/*
* Save the device and inode, so we can detect multiple links
* to the same library. Note, if we reach this point, then
* statbuf is guaranteed to have been filled in.
*/
smpp->spd_dev = statbuf.st_dev;
smpp->spd_ino = statbuf.st_ino;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
LM_PRIVATE(smp)->spd_refcount++;
if(LM_PRIVATE(smp)->spd_refcount == 1) { /* First use of object */
/*
* Recursively map all of the shared objects that this
* one depends upon.
*/
if(map_sods(smp) == -1) { /* Failed */
unmap_object(smp, 0); /* Clean up */
return NULL;
}
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
return smp;
}
Implement support for LD_PRELOAD in the dynamic linker. Remove descriptions of LD_NO_INTERN_SEARCH and LD_NOSTD_PATH from the manual page, since they are not supported. Submitted by: Doug Ambrisko <ambrisko@ambrisko.roble.com>
1996-04-20 18:29:50 +00:00
/*
* Map all the shared libraries named in the LD_PRELOAD environment
* variable.
*
* Returns 0 on success, -1 on failure. On failure, an error message can
* be gotten via dlerror().
*/
static int
map_preload __P((void)) {
char *ld_name = ld_preload;
char *name;
while ((name = strsep(&ld_name, ":")) != NULL) {
char *path = NULL;
struct so_map *smp = NULL;
if (*name != '\0') {
path = (strchr(name, '/') != NULL) ? strdup(name) :
rtfindfile(name);
}
if (path == NULL) {
generror("Can't find LD_PRELOAD shared"
" library \"%s\"", name);
} else {
smp = map_object(path, (struct sod *) NULL,
(struct so_map *) NULL);
free(path);
}
if (ld_name != NULL)
*(ld_name - 1) = ':';
if (smp == NULL) {
/*
* We don't bother to unmap already-loaded libraries
* on failure, because in that case the program is
* about to die anyway.
*/
return -1;
}
}
return 0;
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/*
* Map all of the shared objects that a given object depends upon. PARENT is
* a pointer to the link map for the shared object whose dependencies are
* to be mapped.
*
* Returns 0 on success. Returns -1 on failure. In that case, an error
* message can be retrieved by calling dlerror().
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static int
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
map_sods(parent)
struct so_map *parent;
{
struct somap_private *parpp = LM_PRIVATE(parent);
struct so_list **soltail = &parpp->spd_children;
long next = LD_NEED(parent->som_dynamic);
while(next != 0) {
struct sod *sodp =
(struct sod *) (LM_LDBASE(parent) + next);
char *name =
(char *) (LM_LDBASE(parent) + sodp->sod_name);
char *path = NULL;
struct so_map *smp = NULL;
if(sodp->sod_library) {
Fix a bug in the handling of minor version numbers. Formerly, the rtld would accept the first shared library it found with the right major version number, even if the minor version number was too low. If a different version of the shared library with an adequate minor version number appeared later in the search path, it would not be found. Now the rtld searches all locations first looking for a library with a minor version that is high enough. Only if such a library is not found will it fall back to accepting a minor version number that is too low. As before, a warning comes out in that case. This solves some problems encountered when building an older world on a -current system.
1998-11-07 01:59:39 +00:00
/*
* First try for a match with an adequate minor
* number.
*/
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
path = rtfindlib(name, sodp->sod_major,
Fix a bug in the handling of minor version numbers. Formerly, the rtld would accept the first shared library it found with the right major version number, even if the minor version number was too low. If a different version of the shared library with an adequate minor version number appeared later in the search path, it would not be found. Now the rtld searches all locations first looking for a library with a minor version that is high enough. Only if such a library is not found will it fall back to accepting a minor version number that is too low. As before, a warning comes out in that case. This solves some problems encountered when building an older world on a -current system.
1998-11-07 01:59:39 +00:00
sodp->sod_minor, 1);
/*
* If none was found, try for just a major version
* match. A warning is issued by rtfindlib in
* this case, since the minor version number isn't
* really high enough.
*/
if (path == NULL)
path = rtfindlib(name, sodp->sod_major,
sodp->sod_minor, 0);
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
if(path == NULL && !ld_tracing) {
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
generror ("Can't find shared library"
" \"lib%s.so.%d.%d\"", name,
sodp->sod_major, sodp->sod_minor);
}
} else {
if(careful && name[0] != '/') {
generror("Shared library path must start"
" with \"/\" for \"%s\"", name);
} else
path = strdup(name);
}
If errors occur during the loading of the shared libraries required by the main program, report them directly from the dynamic linker and die there, rather than returning an error message to crt0.o. This enables the printing of error messages even for old executables, whose version of crt0.o is not able to print them. This fix closes PR bin/1869. The code in crt0.o for printing error messages from the dynamic linker is no longer used, because of this change. But it must remain, for backward compatibility with older dynamic linkers.
1996-10-24 16:24:19 +00:00
if(path != NULL) {
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
smp = map_object(path, sodp, parent);
free(path);
If errors occur during the loading of the shared libraries required by the main program, report them directly from the dynamic linker and die there, rather than returning an error message to crt0.o. This enables the printing of error messages even for old executables, whose version of crt0.o is not able to print them. This fix closes PR bin/1869. The code in crt0.o for printing error messages from the dynamic linker is no longer used, because of this change. But it must remain, for backward compatibility with older dynamic linkers.
1996-10-24 16:24:19 +00:00
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if(smp != NULL) {
struct so_list *solp = (struct so_list *)
xmalloc(sizeof(struct so_list));
solp->sol_map = smp;
solp->sol_next = NULL;
*soltail = solp;
soltail = &solp->sol_next;
If errors occur during the loading of the shared libraries required by the main program, report them directly from the dynamic linker and die there, rather than returning an error message to crt0.o. This enables the printing of error messages even for old executables, whose version of crt0.o is not able to print them. This fix closes PR bin/1869. The code in crt0.o for printing error messages from the dynamic linker is no longer used, because of this change. But it must remain, for backward compatibility with older dynamic linkers.
1996-10-24 16:24:19 +00:00
} else if(ld_tracing) {
/*
* Allocate a dummy map entry so that we will get the
* "not found" message.
*/
(void)alloc_link_map(NULL, sodp, parent, 0, 0);
Pay attention to the environment variable "LD_IGNORE_MISSING_OBJECTS". If it is set to a nonempty string, then simply skip any missing shared libraries. This came up in a discussion long ago as a potentially useful feature at sysinstall time. For example, an X11 utility could be used without the X libraries being present, provided the utility had a mode in which no X functions were actually called.
1997-01-17 20:22:18 +00:00
} else if (ld_ignore_missing_objects) {
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
const char *msg;
Pay attention to the environment variable "LD_IGNORE_MISSING_OBJECTS". If it is set to a nonempty string, then simply skip any missing shared libraries. This came up in a discussion long ago as a potentially useful feature at sysinstall time. For example, an X11 utility could be used without the X libraries being present, provided the utility had a mode in which no X functions were actually called.
1997-01-17 20:22:18 +00:00
/*
* Call __dlerror() even it we're not going to use
* the message, in order to clear the saved message.
*/
msg = __dlerror(); /* Should never be NULL */
if (!ld_suppress_warnings)
warnx("warning: %s", msg);
If errors occur during the loading of the shared libraries required by the main program, report them directly from the dynamic linker and die there, rather than returning an error message to crt0.o. This enables the printing of error messages even for old executables, whose version of crt0.o is not able to print them. This fix closes PR bin/1869. The code in crt0.o for printing error messages from the dynamic linker is no longer used, because of this change. But it must remain, for backward compatibility with older dynamic linkers.
1996-10-24 16:24:19 +00:00
} else /* Give up */
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
break;
next = sodp->sod_next;
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if(next != 0) {
/*
* Oh drat, we have to clean up a mess.
*
* We failed to load a shared object that we depend upon.
* So now we have to unload any dependencies that we had
* already successfully loaded prior to the error.
*
* Cleaning up doesn't matter so much for the initial
* loading of the program, since any failure is going to
* terminate the program anyway. But it is very important
* to clean up properly when something is being loaded
* via dlopen().
*/
struct so_list *solp;
while((solp = parpp->spd_children) != NULL) {
unmap_object(solp->sol_map, 0);
parpp->spd_children = solp->sol_next;
free(solp);
}
return -1;
Weak symbol support from NetBSD. This should bring us in sync with the NetBSD ld code except for local changes for dlopen() and friends and the hashing on the minor value of the shlibs. We should be binary compatible now with all their libraries. Obtained from: NetBSD
1995-03-04 17:49:20 +00:00
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
return 0;
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/*
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
* Relocate the DAG of shared objects rooted at the given link map
* entry. Returns 0 on success, or -1 on failure. On failure, an
* error message can be retrieved via dlerror().
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static int
reloc_dag(root, bind_now)
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
struct so_map *root;
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
int bind_now;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
{
struct so_map *smp;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/*
* Relocate all newly-loaded objects. We avoid recursion for this
* step by taking advantage of a few facts. This function is called
* only when there are in fact some newly-loaded objects to process.
* Furthermore, all newly-loaded objects will have their link map
* entries at the end of the link map list. And, the root of the
* tree of objects just loaded will have been the first to be loaded
* and therefore the first new object in the link map list. Finally,
* we take advantage of the fact that we can relocate the newly-loaded
* objects in any order.
*
* All these facts conspire to let us simply loop over the tail
* portion of the link map list, relocating each object so
* encountered.
*/
for(smp = root; smp != NULL; smp = smp->som_next) {
if(!(LM_PRIVATE(smp)->spd_flags & RTLD_RTLD)) {
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
if(reloc_map(smp, bind_now) < 0)
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
return -1;
}
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/*
* Copy any relocated initialized data. Again, we can just loop
* over the appropriate portion of the link map list.
*/
for(smp = root; smp != NULL; smp = smp->som_next) {
if(!(LM_PRIVATE(smp)->spd_flags & RTLD_RTLD))
reloc_copy(smp);
}
Remove trailing whitespace.
1995-05-30 05:05:38 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
return 0;
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
}
/*
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
* Remove a reference to the shared object specified by SMP. If no
* references remain, unmap the object and, recursively, its descendents.
* This function also takes care of calling the finalization routines for
* objects that are removed.
*
* If KEEP is true, then the actual calls to munmap() are skipped,
* and the object is kept in memory. That is used only for finalization,
* from dlexit(), when the program is exiting. There are two reasons
* for it. First, the program is exiting and there is no point in
* spending the time to explicitly unmap its shared objects. Second,
* even after dlexit() has been called, there are still a couple of
* calls that are made to functions in libc. (This is really a bug
* in crt0.) So libc and the main program, at least, must remain
* mapped in that situation.
*
* Under no reasonable circumstances should this function fail. If
* anything goes wrong, we consider it an internal error, and report
* it with err().
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
unmap_object(smp, keep)
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
struct so_map *smp;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
int keep;
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
{
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
struct somap_private *smpp = LM_PRIVATE(smp);
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
smpp->spd_refcount--;
if(smpp->spd_refcount == 0) { /* Finished with this object */
struct so_list *solp;
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if(smpp->spd_flags & RTLD_INIT) { /* Was initialized */
/*
* Call the object's finalization routine. For
* backward compatibility, we first try to call
* ".fini". If that does not exist, we call
* "__fini".
*/
if(call_map(smp, ".fini") == -1)
call_map(smp, "__fini");
}
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/* Recursively unreference the object's descendents */
while((solp = smpp->spd_children) != NULL) {
unmap_object(solp->sol_map, keep);
smpp->spd_children = solp->sol_next;
free(solp);
}
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if(!keep) { /* Unmap the object from memory */
if(munmap(smp->som_addr,
smpp->a_text + smpp->a_data + smpp->a_bss) < 0)
err(1, "internal error 1: munmap failed");
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/* Unlink and free the object's link map entry */
free_link_map(smp);
}
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
static inline int
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
check_text_reloc(r, smp, addr)
struct relocation_info *r;
struct so_map *smp;
caddr_t addr;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
char *sym;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
if (addr >= LM_ETEXT(smp))
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
return 0;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
if (RELOC_EXTERN_P(r))
sym = LM_STRINGS(smp) +
LM_SYMBOL(smp, RELOC_SYMBOL(r))->nz_strx;
else
sym = "";
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
if (!ld_suppress_warnings && ld_warn_non_pure_code)
Weak symbol support from NetBSD. This should bring us in sync with the NetBSD ld code except for local changes for dlopen() and friends and the hashing on the minor value of the shlibs. We should be binary compatible now with all their libraries. Obtained from: NetBSD
1995-03-04 17:49:20 +00:00
warnx("warning: non pure code in %s at %x (%s)",
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
smp->som_path, r->r_address, sym);
C++ support changes (+misc fixes) from Paul K.
1993-12-22 23:28:35 +00:00
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
if (smp->som_write == 0 &&
mprotect(smp->som_addr + LM_TXTADDR(smp),
LD_TEXTSZ(smp->som_dynamic),
PROT_READ|PROT_WRITE|PROT_EXEC) == -1) {
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
generror ("mprotect failed for \"%s\" : %s",
smp->som_path, strerror (errno));
return -1;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
smp->som_write = 1;
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
return 0;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
static int
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
reloc_map(smp, bind_now)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct so_map *smp;
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
int bind_now;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
{
Changed the terminology for what used to be called the "memorizing" vector. Now it is called the "symbol caching" vector. This was made possible and unconfusing by other changes that allowed me to localize everything having to do with the caching vector in the function reloc_map(). Switched to alloca() for allocating the caching vector, and eliminated the special mmap-based allocation routines. Although this was motivated by performance reasons, it led to significant simplification of the code, and made it possible to confine the symbol caching code to the single function reloc_map(). Got rid of the unnecessary and inefficient division loop at the beginning of rtld(). Reduced the number of calls to getenv("LD_LIBRARY_PATH") to just 1, on suggestion from <davidg@root.com>. Added breaks out of the relocation loops when the relocation address is found to be 0. A relocation address of 0 is caused by an unused relocation entry. Unused relocation entries are caused by linking a shared object with the "-Bsymbolic" switch. The runtime linker itself is linked that way, and the last 40% of its relocation entries are unused. Thus, breaking out of the loop on the first such entry is a performance win when ld.so relocates itself. As a side benefit, it permits removing a test from md_relocate_simple() in ../i386/md-static-funcs.c. Unused relocation entries in other shared objects (linked with "-Bsymbolic") caused even bigger problems in previous versions of the runtime linker. The runtime linker interpreted the unused entries as if they were valid. That caused it to perform repeated relocations of the first byte of the shared object. In order to do that, it had to remap the text segment writable. Breaking out of the loop on the first unused relocation entry solves that. Submitted by: John Polstra <jdp@polstra.com>
1995-11-02 18:48:15 +00:00
/*
* Caching structure for reducing the number of calls to
* lookup() during relocation.
*
* While relocating a given shared object, the dynamic linker
* maintains a caching vector that is directly indexed by
* the symbol number in the relocation entry. The first time
* a given symbol is looked up, the caching vector is
* filled in with a pointer to the symbol table entry, and
* a pointer to the so_map of the shared object in which the
* symbol was defined. On subsequent uses of the same symbol,
* that information is retrieved directly from the caching
* vector, without calling lookup() again.
*
* A symbol that is referenced in a relocation entry is
* typically referenced in many relocation entries, so this
* caching reduces the number of calls to lookup()
* dramatically. The overall improvement in the speed of
* dynamic linking is also dramatic -- as much as a factor
* of three for programs that use many shared libaries.
*/
struct cacheent {
struct nzlist *np; /* Pointer to symbol entry */
struct so_map *src_map; /* Shared object that defined symbol */
};
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct _dynamic *dp = smp->som_dynamic;
struct relocation_info *r = LM_REL(smp);
struct relocation_info *rend = r + LD_RELSZ(dp)/sizeof(*r);
long symbolbase = (long)LM_SYMBOL(smp, 0);
char *stringbase = LM_STRINGS(smp);
int symsize = LD_VERSION_NZLIST_P(dp->d_version) ?
sizeof(struct nzlist) :
sizeof(struct nlist);
Changed the terminology for what used to be called the "memorizing" vector. Now it is called the "symbol caching" vector. This was made possible and unconfusing by other changes that allowed me to localize everything having to do with the caching vector in the function reloc_map(). Switched to alloca() for allocating the caching vector, and eliminated the special mmap-based allocation routines. Although this was motivated by performance reasons, it led to significant simplification of the code, and made it possible to confine the symbol caching code to the single function reloc_map(). Got rid of the unnecessary and inefficient division loop at the beginning of rtld(). Reduced the number of calls to getenv("LD_LIBRARY_PATH") to just 1, on suggestion from <davidg@root.com>. Added breaks out of the relocation loops when the relocation address is found to be 0. A relocation address of 0 is caused by an unused relocation entry. Unused relocation entries are caused by linking a shared object with the "-Bsymbolic" switch. The runtime linker itself is linked that way, and the last 40% of its relocation entries are unused. Thus, breaking out of the loop on the first such entry is a performance win when ld.so relocates itself. As a side benefit, it permits removing a test from md_relocate_simple() in ../i386/md-static-funcs.c. Unused relocation entries in other shared objects (linked with "-Bsymbolic") caused even bigger problems in previous versions of the runtime linker. The runtime linker interpreted the unused entries as if they were valid. That caused it to perform repeated relocations of the first byte of the shared object. In order to do that, it had to remap the text segment writable. Breaking out of the loop on the first unused relocation entry solves that. Submitted by: John Polstra <jdp@polstra.com>
1995-11-02 18:48:15 +00:00
long numsyms = LD_STABSZ(dp) / symsize;
size_t cachebytes = numsyms * sizeof(struct cacheent);
struct cacheent *symcache =
(struct cacheent *) alloca(cachebytes);
if(symcache == NULL) {
generror("Cannot allocate symbol caching vector for %s",
smp->som_path);
return -1;
Run-time linker speedups - Round One Implemented symbol memorizing to reduce the number of calls to lookup(), making relocation go faster. While relocating a given shared object, the dynamic linker maintains a memorizing vector that is directly indexed by the symbol number in the relocation entry. The first time a given symbol is looked up, the memorizing vector is filled in with a pointer to the symbol table entry, and a pointer to the so_map of the shared object in which the symbol was defined. On subsequent uses of the same symbol, that information is retrieved directly from the memorizing vector, without calling lookup() again. A symbol that is referenced in a relocation entry is typically referenced in many relocation entries, so this memorizing reduces the number of calls to lookup() dramatically. The overall improvement in the speed of dynamic linking is also dramatic -- as much as a factor of three for programs that use many shared libaries. Submitted by: jdp@polstra.com "John Polstra"
1995-10-25 16:16:35 +00:00
}
Changed the terminology for what used to be called the "memorizing" vector. Now it is called the "symbol caching" vector. This was made possible and unconfusing by other changes that allowed me to localize everything having to do with the caching vector in the function reloc_map(). Switched to alloca() for allocating the caching vector, and eliminated the special mmap-based allocation routines. Although this was motivated by performance reasons, it led to significant simplification of the code, and made it possible to confine the symbol caching code to the single function reloc_map(). Got rid of the unnecessary and inefficient division loop at the beginning of rtld(). Reduced the number of calls to getenv("LD_LIBRARY_PATH") to just 1, on suggestion from <davidg@root.com>. Added breaks out of the relocation loops when the relocation address is found to be 0. A relocation address of 0 is caused by an unused relocation entry. Unused relocation entries are caused by linking a shared object with the "-Bsymbolic" switch. The runtime linker itself is linked that way, and the last 40% of its relocation entries are unused. Thus, breaking out of the loop on the first such entry is a performance win when ld.so relocates itself. As a side benefit, it permits removing a test from md_relocate_simple() in ../i386/md-static-funcs.c. Unused relocation entries in other shared objects (linked with "-Bsymbolic") caused even bigger problems in previous versions of the runtime linker. The runtime linker interpreted the unused entries as if they were valid. That caused it to perform repeated relocations of the first byte of the shared object. In order to do that, it had to remap the text segment writable. Breaking out of the loop on the first unused relocation entry solves that. Submitted by: John Polstra <jdp@polstra.com>
1995-11-02 18:48:15 +00:00
bzero(symcache, cachebytes);
Run-time linker speedups - Round One Implemented symbol memorizing to reduce the number of calls to lookup(), making relocation go faster. While relocating a given shared object, the dynamic linker maintains a memorizing vector that is directly indexed by the symbol number in the relocation entry. The first time a given symbol is looked up, the memorizing vector is filled in with a pointer to the symbol table entry, and a pointer to the so_map of the shared object in which the symbol was defined. On subsequent uses of the same symbol, that information is retrieved directly from the memorizing vector, without calling lookup() again. A symbol that is referenced in a relocation entry is typically referenced in many relocation entries, so this memorizing reduces the number of calls to lookup() dramatically. The overall improvement in the speed of dynamic linking is also dramatic -- as much as a factor of three for programs that use many shared libaries. Submitted by: jdp@polstra.com "John Polstra"
1995-10-25 16:16:35 +00:00
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
if (LD_PLTSZ(dp))
md_fix_jmpslot(LM_PLT(smp),
(long)LM_PLT(smp), (long)binder_entry);
for (; r < rend; r++) {
char *sym;
Changed the terminology for what used to be called the "memorizing" vector. Now it is called the "symbol caching" vector. This was made possible and unconfusing by other changes that allowed me to localize everything having to do with the caching vector in the function reloc_map(). Switched to alloca() for allocating the caching vector, and eliminated the special mmap-based allocation routines. Although this was motivated by performance reasons, it led to significant simplification of the code, and made it possible to confine the symbol caching code to the single function reloc_map(). Got rid of the unnecessary and inefficient division loop at the beginning of rtld(). Reduced the number of calls to getenv("LD_LIBRARY_PATH") to just 1, on suggestion from <davidg@root.com>. Added breaks out of the relocation loops when the relocation address is found to be 0. A relocation address of 0 is caused by an unused relocation entry. Unused relocation entries are caused by linking a shared object with the "-Bsymbolic" switch. The runtime linker itself is linked that way, and the last 40% of its relocation entries are unused. Thus, breaking out of the loop on the first such entry is a performance win when ld.so relocates itself. As a side benefit, it permits removing a test from md_relocate_simple() in ../i386/md-static-funcs.c. Unused relocation entries in other shared objects (linked with "-Bsymbolic") caused even bigger problems in previous versions of the runtime linker. The runtime linker interpreted the unused entries as if they were valid. That caused it to perform repeated relocations of the first byte of the shared object. In order to do that, it had to remap the text segment writable. Breaking out of the loop on the first unused relocation entry solves that. Submitted by: John Polstra <jdp@polstra.com>
1995-11-02 18:48:15 +00:00
caddr_t addr;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
Changed the terminology for what used to be called the "memorizing" vector. Now it is called the "symbol caching" vector. This was made possible and unconfusing by other changes that allowed me to localize everything having to do with the caching vector in the function reloc_map(). Switched to alloca() for allocating the caching vector, and eliminated the special mmap-based allocation routines. Although this was motivated by performance reasons, it led to significant simplification of the code, and made it possible to confine the symbol caching code to the single function reloc_map(). Got rid of the unnecessary and inefficient division loop at the beginning of rtld(). Reduced the number of calls to getenv("LD_LIBRARY_PATH") to just 1, on suggestion from <davidg@root.com>. Added breaks out of the relocation loops when the relocation address is found to be 0. A relocation address of 0 is caused by an unused relocation entry. Unused relocation entries are caused by linking a shared object with the "-Bsymbolic" switch. The runtime linker itself is linked that way, and the last 40% of its relocation entries are unused. Thus, breaking out of the loop on the first such entry is a performance win when ld.so relocates itself. As a side benefit, it permits removing a test from md_relocate_simple() in ../i386/md-static-funcs.c. Unused relocation entries in other shared objects (linked with "-Bsymbolic") caused even bigger problems in previous versions of the runtime linker. The runtime linker interpreted the unused entries as if they were valid. That caused it to perform repeated relocations of the first byte of the shared object. In order to do that, it had to remap the text segment writable. Breaking out of the loop on the first unused relocation entry solves that. Submitted by: John Polstra <jdp@polstra.com>
1995-11-02 18:48:15 +00:00
/*
* Objects linked with "-Bsymbolic" can end up having unused
* relocation entries at the end. These can be detected by
* the fact that they have an address of 0.
*/
if(r->r_address == 0) /* Finished relocating this object */
break;
addr = smp->som_addr + r->r_address;
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
if (check_text_reloc(r, smp, addr) < 0)
return -1;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
if (RELOC_EXTERN_P(r)) {
struct so_map *src_map = NULL;
struct nzlist *p, *np;
Run-time linker speedups - Round One Implemented symbol memorizing to reduce the number of calls to lookup(), making relocation go faster. While relocating a given shared object, the dynamic linker maintains a memorizing vector that is directly indexed by the symbol number in the relocation entry. The first time a given symbol is looked up, the memorizing vector is filled in with a pointer to the symbol table entry, and a pointer to the so_map of the shared object in which the symbol was defined. On subsequent uses of the same symbol, that information is retrieved directly from the memorizing vector, without calling lookup() again. A symbol that is referenced in a relocation entry is typically referenced in many relocation entries, so this memorizing reduces the number of calls to lookup() dramatically. The overall improvement in the speed of dynamic linking is also dramatic -- as much as a factor of three for programs that use many shared libaries. Submitted by: jdp@polstra.com "John Polstra"
1995-10-25 16:16:35 +00:00
long relocation;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
if (RELOC_JMPTAB_P(r) && !bind_now)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
continue;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
p = (struct nzlist *)
(symbolbase + symsize * RELOC_SYMBOL(r));
if (p->nz_type == (N_SETV + N_EXT))
src_map = smp;
sym = stringbase + p->nz_strx;
Changed the terminology for what used to be called the "memorizing" vector. Now it is called the "symbol caching" vector. This was made possible and unconfusing by other changes that allowed me to localize everything having to do with the caching vector in the function reloc_map(). Switched to alloca() for allocating the caching vector, and eliminated the special mmap-based allocation routines. Although this was motivated by performance reasons, it led to significant simplification of the code, and made it possible to confine the symbol caching code to the single function reloc_map(). Got rid of the unnecessary and inefficient division loop at the beginning of rtld(). Reduced the number of calls to getenv("LD_LIBRARY_PATH") to just 1, on suggestion from <davidg@root.com>. Added breaks out of the relocation loops when the relocation address is found to be 0. A relocation address of 0 is caused by an unused relocation entry. Unused relocation entries are caused by linking a shared object with the "-Bsymbolic" switch. The runtime linker itself is linked that way, and the last 40% of its relocation entries are unused. Thus, breaking out of the loop on the first such entry is a performance win when ld.so relocates itself. As a side benefit, it permits removing a test from md_relocate_simple() in ../i386/md-static-funcs.c. Unused relocation entries in other shared objects (linked with "-Bsymbolic") caused even bigger problems in previous versions of the runtime linker. The runtime linker interpreted the unused entries as if they were valid. That caused it to perform repeated relocations of the first byte of the shared object. In order to do that, it had to remap the text segment writable. Breaking out of the loop on the first unused relocation entry solves that. Submitted by: John Polstra <jdp@polstra.com>
1995-11-02 18:48:15 +00:00
/*
* Look up the symbol, checking the caching
* vector first.
*/
np = symcache[RELOC_SYMBOL(r)].np;
if(np != NULL) /* Symbol already cached */
src_map = symcache[RELOC_SYMBOL(r)].src_map;
else { /* Symbol not cached yet */
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
np = lookup(sym, &src_map, RELOC_JMPTAB_P(r));
Changed the terminology for what used to be called the "memorizing" vector. Now it is called the "symbol caching" vector. This was made possible and unconfusing by other changes that allowed me to localize everything having to do with the caching vector in the function reloc_map(). Switched to alloca() for allocating the caching vector, and eliminated the special mmap-based allocation routines. Although this was motivated by performance reasons, it led to significant simplification of the code, and made it possible to confine the symbol caching code to the single function reloc_map(). Got rid of the unnecessary and inefficient division loop at the beginning of rtld(). Reduced the number of calls to getenv("LD_LIBRARY_PATH") to just 1, on suggestion from <davidg@root.com>. Added breaks out of the relocation loops when the relocation address is found to be 0. A relocation address of 0 is caused by an unused relocation entry. Unused relocation entries are caused by linking a shared object with the "-Bsymbolic" switch. The runtime linker itself is linked that way, and the last 40% of its relocation entries are unused. Thus, breaking out of the loop on the first such entry is a performance win when ld.so relocates itself. As a side benefit, it permits removing a test from md_relocate_simple() in ../i386/md-static-funcs.c. Unused relocation entries in other shared objects (linked with "-Bsymbolic") caused even bigger problems in previous versions of the runtime linker. The runtime linker interpreted the unused entries as if they were valid. That caused it to perform repeated relocations of the first byte of the shared object. In order to do that, it had to remap the text segment writable. Breaking out of the loop on the first unused relocation entry solves that. Submitted by: John Polstra <jdp@polstra.com>
1995-11-02 18:48:15 +00:00
/*
* Record the needed information about
* the symbol in the caching vector,
* so that we won't have to call
* lookup the next time we encounter
* the symbol.
*/
symcache[RELOC_SYMBOL(r)].np = np;
symcache[RELOC_SYMBOL(r)].src_map = src_map;
}
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
if (np == NULL) {
generror ("Undefined symbol \"%s\" in %s:%s",
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
sym, main_progname, smp->som_path);
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
return -1;
}
Changed the terminology for what used to be called the "memorizing" vector. Now it is called the "symbol caching" vector. This was made possible and unconfusing by other changes that allowed me to localize everything having to do with the caching vector in the function reloc_map(). Switched to alloca() for allocating the caching vector, and eliminated the special mmap-based allocation routines. Although this was motivated by performance reasons, it led to significant simplification of the code, and made it possible to confine the symbol caching code to the single function reloc_map(). Got rid of the unnecessary and inefficient division loop at the beginning of rtld(). Reduced the number of calls to getenv("LD_LIBRARY_PATH") to just 1, on suggestion from <davidg@root.com>. Added breaks out of the relocation loops when the relocation address is found to be 0. A relocation address of 0 is caused by an unused relocation entry. Unused relocation entries are caused by linking a shared object with the "-Bsymbolic" switch. The runtime linker itself is linked that way, and the last 40% of its relocation entries are unused. Thus, breaking out of the loop on the first such entry is a performance win when ld.so relocates itself. As a side benefit, it permits removing a test from md_relocate_simple() in ../i386/md-static-funcs.c. Unused relocation entries in other shared objects (linked with "-Bsymbolic") caused even bigger problems in previous versions of the runtime linker. The runtime linker interpreted the unused entries as if they were valid. That caused it to perform repeated relocations of the first byte of the shared object. In order to do that, it had to remap the text segment writable. Breaking out of the loop on the first unused relocation entry solves that. Submitted by: John Polstra <jdp@polstra.com>
1995-11-02 18:48:15 +00:00
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
/*
* Found symbol definition.
* If it's in a link map, adjust value
* according to the load address of that map.
* Otherwise it's a run-time allocated common
* whose value is already up-to-date.
*/
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
relocation = np->nz_value;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
if (src_map)
relocation += (long)src_map->som_addr;
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
if (RELOC_JMPTAB_P(r)) {
md_bind_jmpslot(relocation, addr);
continue;
}
relocation += md_get_addend(r, addr);
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
if (RELOC_PCREL_P(r))
relocation -= (long)smp->som_addr;
if (RELOC_COPY_P(r) && src_map) {
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
(void)enter_rts(sym, sym_hash(sym),
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
(long)addr,
N_DATA + N_EXT,
src_map->som_addr + np->nz_value,
np->nz_size, src_map);
continue;
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
md_relocate(r, relocation, addr, 0);
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
} else {
md_relocate(r,
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#ifdef SUN_COMPAT
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
md_get_rt_segment_addend(r, addr)
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#else
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
md_get_addend(r, addr)
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#endif
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
+ (long)smp->som_addr, addr, 0);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
}
if (smp->som_write) {
if (mprotect(smp->som_addr + LM_TXTADDR(smp),
LD_TEXTSZ(smp->som_dynamic),
Some of the latest changes from Paul K (taken from NetBSD-current).
1993-11-22 19:05:31 +00:00
PROT_READ|PROT_EXEC) == -1) {
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
generror ("mprotect failed for \"%s\" : %s",
smp->som_path, strerror (errno));
return -1;
Some of the latest changes from Paul K (taken from NetBSD-current).
1993-11-22 19:05:31 +00:00
}
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
smp->som_write = 0;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
return 0;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
reloc_copy(smp)
struct so_map *smp;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
struct rt_symbol *rtsp;
for (rtsp = rt_symbol_head; rtsp; rtsp = rtsp->rt_next)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
if ((rtsp->rt_smp == NULL || rtsp->rt_smp == smp) &&
rtsp->rt_sp->nz_type == N_DATA + N_EXT) {
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
bcopy(rtsp->rt_srcaddr, (caddr_t)rtsp->rt_sp->nz_value,
rtsp->rt_sp->nz_size);
}
}
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
/*
* Initialize the DAG of shared objects rooted at the given object.
*/
static void
init_dag(smp)
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
struct so_map *smp;
{
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
struct somap_private *smpp = LM_PRIVATE(smp);
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if(!(smpp->spd_flags & RTLD_INIT)) { /* Not initialized yet */
smpp->spd_flags |= RTLD_INIT;
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/* Make sure all the children are initialized */
if(smpp->spd_children != NULL)
init_sods(smpp->spd_children);
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if(call_map(smp, ".init") == -1)
call_map(smp, "__init");
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
}
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
init_sods(solp)
struct so_list *solp;
{
/* Recursively initialize the rest of the list */
if(solp->sol_next != NULL)
init_sods(solp->sol_next);
/* Initialize the first element of the list */
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
init_dag(solp->sol_map);
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/*
* Call a function in a given shared object. SMP is the shared object, and
* SYM is the name of the function.
*
* Returns 0 on success, or -1 if the symbol was not found. Failure is not
* necessarily an error condition, so no error message is generated.
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static int
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
call_map(smp, sym)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct so_map *smp;
char *sym;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct so_map *src_map = smp;
struct nzlist *np;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
np = lookup(sym, &src_map, 1);
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if (np) {
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
(*(void (*)())(src_map->som_addr + np->nz_value))();
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
return 0;
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
}
return -1;
}
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
/*
* Run-time common symbol table.
*/
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#define RTC_TABSIZE 57
static struct rt_symbol *rt_symtab[RTC_TABSIZE];
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
/*
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
* Look up a symbol in the run-time common symbol table. For efficiency,
* the symbol's hash value must be passed in too.
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static inline struct rt_symbol *
lookup_rts(name, hash)
char *name;
unsigned long hash;
C++ support changes (+misc fixes) from Paul K.
1993-12-22 23:28:35 +00:00
{
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
register struct rt_symbol *rtsp;
C++ support changes (+misc fixes) from Paul K.
1993-12-22 23:28:35 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
for (rtsp = rt_symtab[hash % RTC_TABSIZE]; rtsp; rtsp = rtsp->rt_link)
if (strcmp(name, rtsp->rt_sp->nz_name) == 0)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
return rtsp;
return NULL;
C++ support changes (+misc fixes) from Paul K.
1993-12-22 23:28:35 +00:00
}
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
/*
* Enter a symbol into the run-time common symbol table. For efficiency,
* the symbol's hash value must be passed in too.
*/
static struct rt_symbol *
enter_rts(name, hash, value, type, srcaddr, size, smp)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
char *name;
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
unsigned long hash;
long value;
int type;
caddr_t srcaddr;
long size;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct so_map *smp;
{
register struct rt_symbol *rtsp, **rpp;
/* Find end of bucket */
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
for (rpp = &rt_symtab[hash % RTC_TABSIZE]; *rpp; rpp = &(*rpp)->rt_link)
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
continue;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
/* Allocate new common symbol */
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
rtsp = (struct rt_symbol *)xmalloc(sizeof(struct rt_symbol));
rtsp->rt_sp = (struct nzlist *)xmalloc(sizeof(struct nzlist));
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
rtsp->rt_sp->nz_name = strdup(name);
rtsp->rt_sp->nz_value = value;
rtsp->rt_sp->nz_type = type;
rtsp->rt_sp->nz_size = size;
rtsp->rt_srcaddr = srcaddr;
rtsp->rt_smp = smp;
rtsp->rt_link = NULL;
/* Link onto linear list as well */
rtsp->rt_next = rt_symbol_head;
rt_symbol_head = rtsp;
*rpp = rtsp;
return rtsp;
}
Some of the latest changes from Paul K (taken from NetBSD-current).
1993-11-22 19:05:31 +00:00
/*
* Lookup NAME in the link maps. The link map producing a definition
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
* is returned in SRC_MAP. If SRC_MAP is not NULL on entry the search
* is confined to that map.
*
* REAL_DEF_ONLY is a boolean which specifies whether certain special
* symbols for functions should satisfy the lookup or not. The
* reasons behind it are somewhat complicated. They are motivated
* by the scenario in which the address of a single function is
* taken from several shared objects. The address should come out
* the same in all cases, because the application code might decide
* to use it in comparisons. To make this work, the linker creates
* a symbol entry for the function in the main executable, with a
* type of N_UNDF+N_EXT, an N_AUX of AUX_FUNC, and a value that
* refers to the PLT entry for the function in the main executable.
* If REAL_DEF_ONLY is false, then this kind of special symbol is
* considered a "definition" when lookup up the symbol. Since the
* main executable is at the beginning of the shared object search
* list, the result is that references from all shared objects will
* resolve to the main program's PLT entry, and thus the function
* addresses will compare equal as they should.
*
* When relocating the PLT entry itself, we obviously must match
* only the true defining symbol for the function. In that case, we
* set REAL_DEF_ONLY to true, which disables matching the special
* N_UNDF+N_EXT entries.
*
* It is not so clear how to set this flag for a lookup done from
* dlsym. If the lookup specifies a particular shared object other
* than the main executable, the flag makes no difference -- only the
* true definition will be matched. (That is because the special
* symbols are only present in the main executable, which will not
* be searched.) But when the lookup is over all the shared objects
* (i.e., dlsym's "fd" parameter is NULL), then the flag does have an
* effect. We elect to match only the true definition even in that
* case.
*
* The upshot of all this is the following rule of thumb: Set
* REAL_DEF_ONLY in all cases except when processing a non-PLT
* relocation.
Some of the latest changes from Paul K (taken from NetBSD-current).
1993-11-22 19:05:31 +00:00
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static struct nzlist *
lookup(name, src_map, real_def_only)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
char *name;
struct so_map **src_map; /* IN/OUT */
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
int real_def_only;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
unsigned long hash;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
hash = sym_hash(name);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
if (*src_map != NULL) /* Look in just one specific object */
return lookup_in_obj(name, hash, *src_map, real_def_only);
else { /* Search runtime symbols and all loaded objects */
unsigned long common_size;
struct so_map *smp;
struct rt_symbol *rtsp;
struct nzlist *np;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
if ((rtsp = lookup_rts(name, hash)) != NULL)
return rtsp->rt_sp;
C++ support changes (+misc fixes) from Paul K.
1993-12-22 23:28:35 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
common_size = 0;
for (smp = link_map_head; smp; smp = smp->som_next) {
if (LM_PRIVATE(smp)->spd_flags & RTLD_RTLD)
continue;
np = lookup_in_obj(name, hash, smp, real_def_only);
if (np == NULL)
continue;
/* We know that np->nz_value > 0 at this point. */
if (np->nz_type == N_UNDF+N_EXT &&
N_AUX(&np->nlist) != AUX_FUNC) { /* Common */
Some of the latest changes from Paul K (taken from NetBSD-current).
1993-11-22 19:05:31 +00:00
if (common_size < np->nz_value)
common_size = np->nz_value;
continue;
}
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
/* We found the symbol definition. */
*src_map = smp;
return np;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
if (common_size > 0) { /* It is a common symbol. */
void *mem;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
mem = memset(xmalloc(common_size), 0, common_size);
rtsp = enter_rts(name, hash, (long)mem, N_UNDF + N_EXT,
0, common_size, NULL);
return rtsp->rt_sp;
}
Since I got no objections to this patch, and no one has offered any alternative, I present .. ta! da! .. the __error() hack. This patch to the a.out dynamic loader provides old a.out binaries with __error() if they are linked with an older libc that lacks it, but are also linked against a library that needs it. There is a smaller, tricker hack that takes advantage of the fact that ld.so has __error() too, courtesy of the new libc, but this hack is the straightforward version.
1998-06-21 14:22:29 +00:00
/*
* Just before giving up, check for the __error() hack.
*/
np = lookup_errno_hack(name, src_map, real_def_only);
if (np != NULL)
return np;
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
/* No definition was found for the symbol. */
return NULL;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
/*
* Lookup a symbol in one specific shared object. The hash
* value is passed in for efficiency. For an explanation of the
* "real_def_only" flag, see the comment preceding the "lookup"
* function.
*/
static struct nzlist *
lookup_in_obj(name, hash, smp, real_def_only)
char *name;
unsigned long hash;
struct so_map *smp;
int real_def_only;
{
unsigned long buckets;
struct rrs_hash *hp;
char *cp;
struct nzlist *np;
char *symbolbase;
struct rrs_hash *hashbase;
char *stringbase;
size_t symsize;
if ((buckets = LD_BUCKETS(smp->som_dynamic)) == 0)
return NULL;
hashbase = LM_HASH(smp);
restart:
hp = &hashbase[hash % buckets];
if (hp->rh_symbolnum == -1)
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
return NULL;
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
symbolbase = (char *)LM_SYMBOL(smp, 0);
stringbase = LM_STRINGS(smp);
symsize = LD_VERSION_NZLIST_P(smp->som_dynamic->d_version)?
sizeof(struct nzlist) : sizeof(struct nlist);
for ( ; ; ) {
np = (struct nzlist *)(symbolbase + hp->rh_symbolnum*symsize);
cp = stringbase + np->nz_strx;
if (strcmp(cp, name) == 0)
break;
if (hp->rh_next == 0) /* End of hash chain */
return NULL;
hp = hashbase + hp->rh_next;
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/*
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
* We have a symbol with the name we're looking for.
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
if (np->nz_type == N_INDR+N_EXT) {
/*
* Next symbol gives the aliased name. Restart
* search with new name.
*/
name = stringbase + (++np)->nz_strx;
hash = sym_hash(name);
goto restart;
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
if (np->nz_value == 0) /* It's not a definition */
return NULL;
if (real_def_only) /* Don't match special function symbols. */
if (np->nz_type == N_UNDF+N_EXT &&
N_AUX(&np->nlist) == AUX_FUNC)
return NULL;
return np;
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
/*
* Return the value of a symbol in the user's program. This is used
* internally for a few symbols which must exist. If the requested
* symbol is not found, this simply exits with a fatal error.
*/
static void *
sym_addr(name)
char *name;
{
struct so_map *smp;
struct nzlist *np;
smp = NULL;
np = lookup(name, &smp, 1);
if (np == NULL)
errx(1, "Program has no symbol \"%s\"", name);
return ((smp == NULL) ? NULL : smp->som_addr) + np->nz_value;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
Since I got no objections to this patch, and no one has offered any alternative, I present .. ta! da! .. the __error() hack. This patch to the a.out dynamic loader provides old a.out binaries with __error() if they are linked with an older libc that lacks it, but are also linked against a library that needs it. There is a smaller, tricker hack that takes advantage of the fact that ld.so has __error() too, courtesy of the new libc, but this hack is the straightforward version.
1998-06-21 14:22:29 +00:00
Pass me the pointy hat with the extra sequins. Just a moment, while I get it to sit right... The __error() hack gave out the wrong address. It returned the address of errno in ld.so instead of the address of errno in the main program. Oops. The hack is now correct, just in time to be obsoleted by elf.
1998-08-22 15:51:41 +00:00
static int *p_errno; /* Pointer to errno variable in main program. */
Since I got no objections to this patch, and no one has offered any alternative, I present .. ta! da! .. the __error() hack. This patch to the a.out dynamic loader provides old a.out binaries with __error() if they are linked with an older libc that lacks it, but are also linked against a library that needs it. There is a smaller, tricker hack that takes advantage of the fact that ld.so has __error() too, courtesy of the new libc, but this hack is the straightforward version.
1998-06-21 14:22:29 +00:00
/*
* Help old a.out binaries that are broken by the new errno macro. They
* can be missing __error() through no fault of their own. In particular,
* old a.out binaries can link against an old libc that does not contain
* __error(), yet still require __error() because of other libraries that
* have been recompiled since the errno change. This locates the backward
* compatible work-alike we have hidden here in ld.so.
*/
static struct nzlist *
lookup_errno_hack(sym, src_map, real_def_only)
char *sym;
struct so_map **src_map;
int real_def_only;
{
struct so_map *smp;
struct nzlist *np;
if (strcmp(sym, "___error") != 0)
return NULL;
Pass me the pointy hat with the extra sequins. Just a moment, while I get it to sit right... The __error() hack gave out the wrong address. It returned the address of errno in ld.so instead of the address of errno in the main program. Oops. The hack is now correct, just in time to be obsoleted by elf.
1998-08-22 15:51:41 +00:00
/*
* Locate errno in the main program. If it's not there, NULL
* will be returned by our __error() substitute, and a core dump
* will follow. That's impossible, of course, since crt0.o always
* supplies errno.
*/
smp = NULL;
np = lookup("_errno", &smp, 1);
if (np != NULL && smp != NULL) {
p_errno = (int *)(smp->som_addr + np->nz_value);
#ifdef DEBUG
xprintf(" HACK: _errno at %p in %s\n", p_errno, smp->som_path);
#endif
}
Since I got no objections to this patch, and no one has offered any alternative, I present .. ta! da! .. the __error() hack. This patch to the a.out dynamic loader provides old a.out binaries with __error() if they are linked with an older libc that lacks it, but are also linked against a library that needs it. There is a smaller, tricker hack that takes advantage of the fact that ld.so has __error() too, courtesy of the new libc, but this hack is the straightforward version.
1998-06-21 14:22:29 +00:00
/*
* Specifically find the ld.so link map because most routines
* skip over it during normal operation.
*/
for (smp = link_map_head; ; smp = smp->som_next)
if (LM_PRIVATE(smp)->spd_flags & RTLD_RTLD)
break;
/*
Pass me the pointy hat with the extra sequins. Just a moment, while I get it to sit right... The __error() hack gave out the wrong address. It returned the address of errno in ld.so instead of the address of errno in the main program. Oops. The hack is now correct, just in time to be obsoleted by elf.
1998-08-22 15:51:41 +00:00
* Find our __error() substitute stashed here in ld.so.
Since I got no objections to this patch, and no one has offered any alternative, I present .. ta! da! .. the __error() hack. This patch to the a.out dynamic loader provides old a.out binaries with __error() if they are linked with an older libc that lacks it, but are also linked against a library that needs it. There is a smaller, tricker hack that takes advantage of the fact that ld.so has __error() too, courtesy of the new libc, but this hack is the straightforward version.
1998-06-21 14:22:29 +00:00
*/
np = lookup("___error_unthreaded_hack", &smp, real_def_only);
if (np != NULL)
*src_map = smp;
#ifdef DEBUG
if (np == NULL)
xprintf(" HACK: %s fudge not found, oops\n", sym);
else
xprintf(" HACK: %s fudge in %s\n", sym, smp->som_path);
#endif
return np;
}
/*
* Just like __error_unthreaded(), but for those poor orphaned a.out
* binaries from way back that are bamboozled by the new errno macro.
*/
int *
__error_unthreaded_hack()
{
Pass me the pointy hat with the extra sequins. Just a moment, while I get it to sit right... The __error() hack gave out the wrong address. It returned the address of errno in ld.so instead of the address of errno in the main program. Oops. The hack is now correct, just in time to be obsoleted by elf.
1998-08-22 15:51:41 +00:00
return p_errno;
Since I got no objections to this patch, and no one has offered any alternative, I present .. ta! da! .. the __error() hack. This patch to the a.out dynamic loader provides old a.out binaries with __error() if they are linked with an older libc that lacks it, but are also linked against a library that needs it. There is a smaller, tricker hack that takes advantage of the fact that ld.so has __error() too, courtesy of the new libc, but this hack is the straightforward version.
1998-06-21 14:22:29 +00:00
}
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/*
* This routine is called from the jumptable to resolve
* procedure calls to shared objects.
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
long
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
binder(jsp)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
jmpslot_t *jsp;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct so_map *smp, *src_map = NULL;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
long addr;
char *sym;
struct nzlist *np;
int index;
/*
* Find the PLT map that contains JSP.
*/
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
for (smp = link_map_head; smp; smp = smp->som_next) {
if (LM_PLT(smp) < jsp &&
jsp < LM_PLT(smp) + LD_PLTSZ(smp->som_dynamic)/sizeof(*jsp))
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
break;
}
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
if (smp == NULL)
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
errx(1, "Call to binder from unknown location: %p\n", jsp);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
index = jsp->reloc_index & JMPSLOT_RELOC_MASK;
/* Get the local symbol this jmpslot refers to */
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
sym = LM_STRINGS(smp) +
LM_SYMBOL(smp,RELOC_SYMBOL(&LM_REL(smp)[index]))->nz_strx;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Some of the latest changes from Paul K (taken from NetBSD-current).
1993-11-22 19:05:31 +00:00
np = lookup(sym, &src_map, 1);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
if (np == NULL)
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
errx(1, "Undefined symbol \"%s\" called from %s:%s at %p",
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
sym, main_progname, smp->som_path, jsp);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
/* Fixup jmpslot so future calls transfer directly to target */
addr = np->nz_value;
if (src_map)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
addr += (long)src_map->som_addr;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
md_fix_jmpslot(jsp, (long)jsp, addr);
#if DEBUG
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
xprintf(" BINDER: %s located at = %#x in %s\n", sym, addr,
src_map->som_path);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
#endif
return addr;
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
static struct hints_header *hheader; /* NULL means not mapped */
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
static struct hints_bucket *hbuckets;
static char *hstrtab;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/*
* Map the hints file into memory, if it is not already mapped. Returns
* 0 on success, or -1 on failure.
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static int
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
maphints __P((void))
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
static int hints_bad; /* TRUE if hints are unusable */
Add the search directories from the hints file only the first time it is opened. After that, the directories are already present, and there is no point in adding them again. This doesn't fix any bugs; it's just for efficiency.
1996-10-10 23:16:50 +00:00
static int paths_added;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
int hfd;
struct hints_header hdr;
caddr_t addr;
if (hheader != NULL) /* Already mapped */
return 0;
if (hints_bad) /* Known to be corrupt or unavailable */
return -1;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Weak symbol support from NetBSD. This should bring us in sync with the NetBSD ld code except for local changes for dlopen() and friends and the hashing on the minor value of the shlibs. We should be binary compatible now with all their libraries. Obtained from: NetBSD
1995-03-04 17:49:20 +00:00
if ((hfd = open(_PATH_LD_HINTS, O_RDONLY, 0)) == -1) {
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
hints_bad = 1;
return -1;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/* Read the header and check it */
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if (read(hfd, &hdr, sizeof hdr) != sizeof hdr ||
HH_BADMAG(hdr) ||
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
(hdr.hh_version != LD_HINTS_VERSION_1 &&
hdr.hh_version != LD_HINTS_VERSION_2)) {
Weak symbol support from NetBSD. This should bring us in sync with the NetBSD ld code except for local changes for dlopen() and friends and the hashing on the minor value of the shlibs. We should be binary compatible now with all their libraries. Obtained from: NetBSD
1995-03-04 17:49:20 +00:00
close(hfd);
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
hints_bad = 1;
return -1;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/* Map the hints into memory */
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
addr = mmap(0, hdr.hh_ehints, PROT_READ, MAP_SHARED, hfd, 0);
if (addr == (caddr_t)-1) {
Weak symbol support from NetBSD. This should bring us in sync with the NetBSD ld code except for local changes for dlopen() and friends and the hashing on the minor value of the shlibs. We should be binary compatible now with all their libraries. Obtained from: NetBSD
1995-03-04 17:49:20 +00:00
close(hfd);
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
hints_bad = 1;
return -1;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
close(hfd);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
hheader = (struct hints_header *)addr;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
hbuckets = (struct hints_bucket *)(addr + hheader->hh_hashtab);
hstrtab = (char *)(addr + hheader->hh_strtab);
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
/* pluck out the system ldconfig path */
Add the search directories from the hints file only the first time it is opened. After that, the directories are already present, and there is no point in adding them again. This doesn't fix any bugs; it's just for efficiency.
1996-10-10 23:16:50 +00:00
if (hheader->hh_version >= LD_HINTS_VERSION_2 && !paths_added) {
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
add_search_path(hstrtab + hheader->hh_dirlist);
Add the search directories from the hints file only the first time it is opened. After that, the directories are already present, and there is no point in adding them again. This doesn't fix any bugs; it's just for efficiency.
1996-10-10 23:16:50 +00:00
paths_added = 1;
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
return 0;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/*
* Unmap the hints file, if it is currently mapped.
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void
Unmap hints file when finished with it, so that it can go away completely when ldconfig unlinks it. If init is shared, then the referenced unlinked copy of the hints file created by running ldconfig in /etc/rc caused the file system to be unclean after every reboot.
1994-09-15 20:48:55 +00:00
unmaphints()
{
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if (hheader != NULL) {
munmap((caddr_t)hheader, hheader->hh_ehints);
Unmap hints file when finished with it, so that it can go away completely when ldconfig unlinks it. If init is shared, then the referenced unlinked copy of the hints file created by running ldconfig in /etc/rc caused the file system to be unclean after every reboot.
1994-09-15 20:48:55 +00:00
hheader = NULL;
}
}
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
int
Make ldconfig and ld.so not hashing the shared lib minor number. This misfeature caused troubles when a program attempted to access a shlib where one with a higher minor number has been hashed. Ldconfig does only include the highest-numbered shlib anyway, so this is in no way a limitation of generality. Caution: after installing the new programs, your /var/run/ld.so.hints needs to be rebuiult; run ldconfig again as it's done from /etc/rc.
1995-01-12 19:12:29 +00:00
hinthash(cp, vmajor)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
char *cp;
Make ldconfig and ld.so not hashing the shared lib minor number. This misfeature caused troubles when a program attempted to access a shlib where one with a higher minor number has been hashed. Ldconfig does only include the highest-numbered shlib anyway, so this is in no way a limitation of generality. Caution: after installing the new programs, your /var/run/ld.so.hints needs to be rebuiult; run ldconfig again as it's done from /etc/rc.
1995-01-12 19:12:29 +00:00
int vmajor;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
int k = 0;
while (*cp)
k = (((k << 1) + (k >> 14)) ^ (*cp++)) & 0x3fff;
k = (((k << 1) + (k >> 14)) ^ (vmajor*257)) & 0x3fff;
return k;
}
#undef major
#undef minor
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/*
* Search for a library in the hints generated by ldconfig. On success,
* returns the full pathname of the matching library. This string is
* always dynamically allocated on the heap.
*
Fix a bug in the handling of minor version numbers. Formerly, the rtld would accept the first shared library it found with the right major version number, even if the minor version number was too low. If a different version of the shared library with an adequate minor version number appeared later in the search path, it would not be found. Now the rtld searches all locations first looking for a library with a minor version that is high enough. Only if such a library is not found will it fall back to accepting a minor version number that is too low. As before, a warning comes out in that case. This solves some problems encountered when building an older world on a -current system.
1998-11-07 01:59:39 +00:00
* MINORP is an in/out parameter. If the incoming value of *MINORP is
* >= 0, then no library will be considered a match unless its minor
* version number is at least that large. Otherwise, only the major
* version number is checked. In any case, the minor number of the
* matching library is stored into *MINORP.
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
*
* Returns NULL if the library cannot be found.
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static char *
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
findhint(name, major, minorp)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
char *name;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
int major;
int *minorp;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
struct hints_bucket *bp =
hbuckets + (hinthash(name, major) % hheader->hh_nbucket);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
while (1) {
/* Sanity check */
if (bp->hi_namex >= hheader->hh_strtab_sz) {
Sync. up bits with Paul K. Cascade support plus some cosmetic changes. Obtained from: NetBSD
1995-04-21 04:57:50 +00:00
warnx("Bad name index: %#x\n", bp->hi_namex);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
break;
}
if (bp->hi_pathx >= hheader->hh_strtab_sz) {
Sync. up bits with Paul K. Cascade support plus some cosmetic changes. Obtained from: NetBSD
1995-04-21 04:57:50 +00:00
warnx("Bad path index: %#x\n", bp->hi_pathx);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
break;
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/*
Fix a bug in the handling of minor version numbers. Formerly, the rtld would accept the first shared library it found with the right major version number, even if the minor version number was too low. If a different version of the shared library with an adequate minor version number appeared later in the search path, it would not be found. Now the rtld searches all locations first looking for a library with a minor version that is high enough. Only if such a library is not found will it fall back to accepting a minor version number that is too low. As before, a warning comes out in that case. This solves some problems encountered when building an older world on a -current system.
1998-11-07 01:59:39 +00:00
* For a given major number, the hints file has only one
* entry -- namely, the one with the highest minor number.
* If we find an entry with a matching major number, we
* know it is the best one.
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
*/
if (strcmp(name, hstrtab + bp->hi_namex) == 0 &&
bp->hi_major == major) {
If a library is found in the hints file, but the library doesn't exist, ignore the hint. This is a straightforward fix, and it should go into 2.2 after a burn-in period of a few days. Noticed by: bde
1997-01-14 17:53:55 +00:00
struct stat s;
Fix a bug in the handling of minor version numbers. Formerly, the rtld would accept the first shared library it found with the right major version number, even if the minor version number was too low. If a different version of the shared library with an adequate minor version number appeared later in the search path, it would not be found. Now the rtld searches all locations first looking for a library with a minor version that is high enough. Only if such a library is not found will it fall back to accepting a minor version number that is too low. As before, a warning comes out in that case. This solves some problems encountered when building an older world on a -current system.
1998-11-07 01:59:39 +00:00
int realminor;
If a library is found in the hints file, but the library doesn't exist, ignore the hint. This is a straightforward fix, and it should go into 2.2 after a burn-in period of a few days. Noticed by: bde
1997-01-14 17:53:55 +00:00
Fix a bug in the handling of minor version numbers. Formerly, the rtld would accept the first shared library it found with the right major version number, even if the minor version number was too low. If a different version of the shared library with an adequate minor version number appeared later in the search path, it would not be found. Now the rtld searches all locations first looking for a library with a minor version that is high enough. Only if such a library is not found will it fall back to accepting a minor version number that is too low. As before, a warning comes out in that case. This solves some problems encountered when building an older world on a -current system.
1998-11-07 01:59:39 +00:00
realminor = bp->hi_ndewey >= 2 ? bp->hi_minor : 0;
if (realminor < *minorp) /* Not good enough */
return NULL;
If a library is found in the hints file, but the library doesn't exist, ignore the hint. This is a straightforward fix, and it should go into 2.2 after a burn-in period of a few days. Noticed by: bde
1997-01-14 17:53:55 +00:00
if (stat(hstrtab + bp->hi_pathx, &s) == -1)
return NULL; /* Doesn't actually exist */
Fix a bug in the handling of minor version numbers. Formerly, the rtld would accept the first shared library it found with the right major version number, even if the minor version number was too low. If a different version of the shared library with an adequate minor version number appeared later in the search path, it would not be found. Now the rtld searches all locations first looking for a library with a minor version that is high enough. Only if such a library is not found will it fall back to accepting a minor version number that is too low. As before, a warning comes out in that case. This solves some problems encountered when building an older world on a -current system.
1998-11-07 01:59:39 +00:00
*minorp = realminor;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
return strdup(hstrtab + bp->hi_pathx);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
if (bp->hi_next == -1)
break;
/* Move on to next in bucket */
bp = &hbuckets[bp->hi_next];
}
/* No hints available for name */
return NULL;
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/*
* Search for the given shared library. On success, returns a string
* containing the full pathname for the library. This string is always
* dynamically allocated on the heap.
*
* Returns NULL if the library cannot be found.
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static char *
Fix a bug in the handling of minor version numbers. Formerly, the rtld would accept the first shared library it found with the right major version number, even if the minor version number was too low. If a different version of the shared library with an adequate minor version number appeared later in the search path, it would not be found. Now the rtld searches all locations first looking for a library with a minor version that is high enough. Only if such a library is not found will it fall back to accepting a minor version number that is too low. As before, a warning comes out in that case. This solves some problems encountered when building an older world on a -current system.
1998-11-07 01:59:39 +00:00
rtfindlib(name, major, minor, strictminor)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
char *name;
int major, minor;
Fix a bug in the handling of minor version numbers. Formerly, the rtld would accept the first shared library it found with the right major version number, even if the minor version number was too low. If a different version of the shared library with an adequate minor version number appeared later in the search path, it would not be found. Now the rtld searches all locations first looking for a library with a minor version that is high enough. Only if such a library is not found will it fall back to accepting a minor version number that is too low. As before, a warning comes out in that case. This solves some problems encountered when building an older world on a -current system.
1998-11-07 01:59:39 +00:00
int strictminor;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
char *ld_path = ld_library_path;
char *path = NULL;
Fix a bug in the handling of minor version numbers. Formerly, the rtld would accept the first shared library it found with the right major version number, even if the minor version number was too low. If a different version of the shared library with an adequate minor version number appeared later in the search path, it would not be found. Now the rtld searches all locations first looking for a library with a minor version that is high enough. Only if such a library is not found will it fall back to accepting a minor version number that is too low. As before, a warning comes out in that case. This solves some problems encountered when building an older world on a -current system.
1998-11-07 01:59:39 +00:00
int realminor;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Fix a bug in the handling of minor version numbers. Formerly, the rtld would accept the first shared library it found with the right major version number, even if the minor version number was too low. If a different version of the shared library with an adequate minor version number appeared later in the search path, it would not be found. Now the rtld searches all locations first looking for a library with a minor version that is high enough. Only if such a library is not found will it fall back to accepting a minor version number that is too low. As before, a warning comes out in that case. This solves some problems encountered when building an older world on a -current system.
1998-11-07 01:59:39 +00:00
realminor = strictminor ? minor : -1;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if (ld_path != NULL) { /* First, search the directories in ld_path */
/*
* There is no point in trying to use the hints file for this.
*/
char *dir;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
while (path == NULL && (dir = strsep(&ld_path, ":")) != NULL) {
path = search_lib_dir(dir, name, &major, &realminor, 0);
Implement support for LD_PRELOAD in the dynamic linker. Remove descriptions of LD_NO_INTERN_SEARCH and LD_NOSTD_PATH from the manual page, since they are not supported. Submitted by: Doug Ambrisko <ambrisko@ambrisko.roble.com>
1996-04-20 18:29:50 +00:00
if (ld_path != NULL)
*(ld_path - 1) = ':';
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if (path == NULL && maphints() == 0) /* Search the hints file */
path = findhint(name, major, &realminor);
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if (path == NULL) /* Search the standard directories */
path = findshlib(name, &major, &realminor, 0);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
if (path != NULL && realminor < minor && !ld_suppress_warnings) {
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
warnx("warning: %s: minor version %d"
" older than expected %d, using it anyway",
path, realminor, minor);
}
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
return path;
}
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
Implement support for LD_PRELOAD in the dynamic linker. Remove descriptions of LD_NO_INTERN_SEARCH and LD_NOSTD_PATH from the manual page, since they are not supported. Submitted by: Doug Ambrisko <ambrisko@ambrisko.roble.com>
1996-04-20 18:29:50 +00:00
/*
* Search for the given shared library file. This is similar to rtfindlib,
* except that the argument is the actual name of the desired library file.
* Thus there is no need to worry about version numbers. The return value
* is a string containing the full pathname for the library. This string
* is always dynamically allocated on the heap.
*
* Returns NULL if the library cannot be found.
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static char *
Implement support for LD_PRELOAD in the dynamic linker. Remove descriptions of LD_NO_INTERN_SEARCH and LD_NOSTD_PATH from the manual page, since they are not supported. Submitted by: Doug Ambrisko <ambrisko@ambrisko.roble.com>
1996-04-20 18:29:50 +00:00
rtfindfile(name)
Search for libraries in dlopen() when the specified path contains no ``/''s. Elf already searches it seems. Mostly submitted by: Mike Smith <mike@smith.net.au>
1998-06-07 03:53:08 +00:00
const char *name;
Implement support for LD_PRELOAD in the dynamic linker. Remove descriptions of LD_NO_INTERN_SEARCH and LD_NOSTD_PATH from the manual page, since they are not supported. Submitted by: Doug Ambrisko <ambrisko@ambrisko.roble.com>
1996-04-20 18:29:50 +00:00
{
char *ld_path = ld_library_path;
char *path = NULL;
if (ld_path != NULL) { /* First, search the directories in ld_path */
char *dir;
while (path == NULL && (dir = strsep(&ld_path, ":")) != NULL) {
struct stat sb;
path = concat(dir, "/", name);
if (lstat(path, &sb) == -1) { /* Does not exist */
free(path);
path = NULL;
}
if (ld_path != NULL)
*(ld_path - 1) = ':';
}
}
/*
* We don't search the hints file. It is organized around major
* and minor version numbers, so it is not suitable for finding
* a specific file name.
*/
if (path == NULL) /* Search the standard directories */
path = find_lib_file(name);
return path;
}
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
/*
* Buffer for error messages and a pointer that is set to point to the buffer
* when a error occurs. It acts as a last error flag, being set to NULL
* after an error is returned.
*/
#define DLERROR_BUF_SIZE 512
static char dlerror_buf [DLERROR_BUF_SIZE];
static char *dlerror_msg = NULL;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void *
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
__dlopen(path, mode)
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
const char *path;
int mode;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
struct so_map *old_tail = link_map_tail;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct so_map *smp;
Use the RTLD_NOW symbol, now that it is defined in <dlfcn.h>.
1997-01-12 19:59:26 +00:00
int bind_now = mode == RTLD_NOW;
Search for libraries in dlopen() when the specified path contains no ``/''s. Elf already searches it seems. Mostly submitted by: Mike Smith <mike@smith.net.au>
1998-06-07 03:53:08 +00:00
char *name;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
/*
* path == NULL is handled by map_object()
*/
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
anon_open();
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
Search for libraries in dlopen() when the specified path contains no ``/''s. Elf already searches it seems. Mostly submitted by: Mike Smith <mike@smith.net.au>
1998-06-07 03:53:08 +00:00
name = (path && strchr(path, '/') == NULL) ? rtfindfile(path) : (char *)path;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/* Map the object, and the objects on which it depends */
Search for libraries in dlopen() when the specified path contains no ``/''s. Elf already searches it seems. Mostly submitted by: Mike Smith <mike@smith.net.au>
1998-06-07 03:53:08 +00:00
smp = map_object(name, (struct sod *) NULL, (struct so_map *) NULL);
if (name != path)
free(name);
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
if(smp == NULL) /* Failed */
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
return NULL;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
LM_PRIVATE(smp)->spd_flags |= RTLD_DL;
/* Relocate and initialize all newly-mapped objects */
if(link_map_tail != old_tail) { /* We have mapped some new objects */
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
if(reloc_dag(smp, bind_now) == -1) /* Failed */
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
return NULL;
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
init_dag(smp);
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
}
Sync. up bits with Paul K. Cascade support plus some cosmetic changes. Obtained from: NetBSD
1995-04-21 04:57:50 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
unmaphints();
anon_close();
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
return smp;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static int
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
__dlclose(fd)
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
void *fd;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct so_map *smp = (struct so_map *)fd;
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
struct so_map *scanp;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#ifdef DEBUG
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
xprintf("dlclose(%s): refcount = %d\n", smp->som_path,
LM_PRIVATE(smp)->spd_refcount);
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
#endif
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
/* Check the argument for validity */
for(scanp = link_map_head; scanp != NULL; scanp = scanp->som_next)
if(scanp == smp) /* We found the map in the list */
break;
if(scanp == NULL || !(LM_PRIVATE(smp)->spd_flags & RTLD_DL)) {
generror("Invalid argument to dlclose");
return -1;
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
unmap_object(smp, 0);
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
return 0;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
Implement dlsym(RTLD_NEXT, symbol).
1997-08-02 04:56:44 +00:00
/*
* This form of dlsym is obsolete. Current versions of crt0 don't call
* it. It can still be called by old executables that were linked with
* old versions of crt0.
*/
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void *
Changes from Paul Kranenburg which bring us into sync with his sources: handling of errors through the standard err() and warn() more fixes for Geoff Rehmet's NULL pointer bug. fixes NULL pointer bugs when linking mono and nested X servers. supports a `-nostdlib' option. accept object files without a symbol table don't attempt dynamic linking when `-A' is given a few variable names have chaged (desc -> fd), and the formatting has changed which should make it much easier to track his sources. I tested 'make world' for /usr/src and X twice with these changes.
1994-06-15 22:41:19 +00:00
__dlsym(fd, sym)
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
void *fd;
const char *sym;
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
{
Implement dlsym(RTLD_NEXT, symbol).
1997-08-02 04:56:44 +00:00
if (fd == RTLD_NEXT) {
generror("RTLD_NEXT not supported by this version of"
ELF preparation step 2: Move a.out libraries to /usr/lib/aout to make space for ELF libs. Make rtld usr /usr/lib/aout as default library path. Make ldconfig reject /usr/lib as an a.out library path. Fix various Makefiles for LIBDIR!=/usr/lib breakage. This will after a make world & reboot give a system that no longer uses /usr/lib/*, infact one could remove all the old libraries there, they are not used anymore. We are getting close to an ELF make world, but I'll let this all settle for a week or two...
1998-05-26 20:12:56 +00:00
" crt0.o");
Implement dlsym(RTLD_NEXT, symbol).
1997-08-02 04:56:44 +00:00
return NULL;
}
return __dlsym3(fd, sym, NULL);
}
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void *
- In dlsym(), if the lookup fails using the original symbol, prepend an underscore and try looking it up again. This is a non-issue if we switch to ELF. Reviewed by: sef, jdp
1997-08-19 23:33:45 +00:00
resolvesym(fd, sym, retaddr)
Implement dlsym(RTLD_NEXT, symbol).
1997-08-02 04:56:44 +00:00
void *fd;
char *sym;
void *retaddr;
{
struct so_map *smp;
struct so_map *src_map;
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
struct nzlist *np;
long addr;
Implement dlsym(RTLD_NEXT, symbol).
1997-08-02 04:56:44 +00:00
if (fd == RTLD_NEXT) {
/* Find the shared object that contains the caller. */
for (smp = link_map_head; smp != NULL; smp = smp->som_next) {
void *textbase = smp->som_addr + LM_TXTADDR(smp);
void *textlimit = LM_ETEXT(smp);
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
Implement dlsym(RTLD_NEXT, symbol).
1997-08-02 04:56:44 +00:00
if (textbase <= retaddr && retaddr < textlimit)
break;
}
if (smp == NULL) {
generror("Cannot determine caller's shared object");
return NULL;
}
smp = smp->som_next;
if (smp != NULL && LM_PRIVATE(smp)->spd_flags & RTLD_RTLD)
smp = smp->som_next;
if (smp == NULL) {
generror("No next shared object for RTLD_NEXT");
return NULL;
}
do {
src_map = smp;
np = lookup(sym, &src_map, 1);
} while (np == NULL && (smp = smp->som_next) != NULL);
} else {
smp = (struct so_map *)fd;
src_map = NULL;
/*
* Restrict search to passed map if dlopen()ed.
*/
if (smp != NULL && LM_PRIVATE(smp)->spd_flags & RTLD_DL)
src_map = smp;
np = lookup(sym, &src_map, 1);
}
if (np == NULL) {
generror("Undefined symbol");
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
return NULL;
Implement dlsym(RTLD_NEXT, symbol).
1997-08-02 04:56:44 +00:00
}
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
addr = np->nz_value;
if (src_map)
addr += (long)src_map->som_addr;
return (void *)addr;
}
Implement dladdr.
1998-02-06 16:46:46 +00:00
static int
__dladdr(addr, dlip)
const void *addr;
Dl_info *dlip;
{
struct _dynamic *dp;
struct so_map *smp;
char *stringbase;
long numsyms;
int symsize;
int i;
/* Find the shared object that contains the address. */
for (smp = link_map_head; smp != NULL; smp = smp->som_next) {
struct so_map *src_map;
struct somap_private *smpp;
struct nzlist *np;
smpp = LM_PRIVATE(smp);
if (smpp->spd_flags & RTLD_RTLD)
continue;
if ((void *)smp->som_addr > addr)
continue;
src_map = smp;
if ((np = lookup(END_SYM, &src_map, 1)) == NULL)
continue; /* No "_end" symbol?! */
if (addr < (void *)(smp->som_addr + np->nz_value))
break;
}
if (smp == NULL) {
generror("No shared object contains address");
return 0;
}
dlip->dli_fname = smp->som_path;
dlip->dli_fbase = smp->som_addr;
dlip->dli_saddr = (void *) 0;
dlip->dli_sname = NULL;
dp = smp->som_dynamic;
symsize = LD_VERSION_NZLIST_P(dp->d_version) ?
sizeof(struct nzlist) : sizeof(struct nlist);
numsyms = LD_STABSZ(dp) / symsize;
stringbase = LM_STRINGS(smp);
for (i = 0; i < numsyms; i++) {
struct nzlist *symp = LM_SYMBOL(smp, i);
unsigned long value;
/* Reject all except definitions. */
if (symp->nz_type != N_EXT + N_ABS &&
symp->nz_type != N_EXT + N_TEXT &&
symp->nz_type != N_EXT + N_DATA &&
symp->nz_type != N_EXT + N_BSS)
continue;
/*
* If the symbol is greater than the specified address, or
* if it is further away from addr than the current nearest
* symbol, then reject it.
*/
value = (unsigned long) (smp->som_addr + symp->nz_value);
if (value > (unsigned long) addr ||
value < (unsigned long) dlip->dli_saddr)
continue;
/* Update our idea of the nearest symbol. */
dlip->dli_sname = stringbase + symp->nz_strx;
dlip->dli_saddr = (void *) value;
if (dlip->dli_saddr == addr) /* Can't get any closer. */
break;
}
/*
* Remove any leading underscore from the symbol name, to hide
* our a.out-ness.
*/
if (dlip->dli_sname != NULL && dlip->dli_sname[0] == '_')
dlip->dli_sname++;
return 1;
}
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void *
- In dlsym(), if the lookup fails using the original symbol, prepend an underscore and try looking it up again. This is a non-issue if we switch to ELF. Reviewed by: sef, jdp
1997-08-19 23:33:45 +00:00
__dlsym3(fd, sym, retaddr)
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
void *fd;
const char *sym;
void *retaddr;
- In dlsym(), if the lookup fails using the original symbol, prepend an underscore and try looking it up again. This is a non-issue if we switch to ELF. Reviewed by: sef, jdp
1997-08-19 23:33:45 +00:00
{
void *result;
result = resolvesym(fd, sym, retaddr);
/*
* XXX - Ugly, but it makes the least impact on the run-time loader
* sources. We assume that most of the time the error is a
* undefined symbol error from above, so we try again. If it's
* not an undefined symbol we end up getting the same error twice,
* but that's acceptable.
*/
if (result == NULL) {
/* Prepend an underscore and try again */
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
char *newsym = xmalloc(strlen(sym) + 2);
- In dlsym(), if the lookup fails using the original symbol, prepend an underscore and try looking it up again. This is a non-issue if we switch to ELF. Reviewed by: sef, jdp
1997-08-19 23:33:45 +00:00
newsym[0] = '_';
strcpy(&newsym[1], sym);
result = resolvesym(fd, newsym, retaddr);
free(newsym);
}
return result;
}
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static const char *
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
__dlerror __P((void))
This is Paul K's latest set of ld changes. A commit was necessary at this late stage due to the fact that link.h was copyright Sun Microsystems. This version of ld sync's us up with NetBSD's ld and supports compatablily with NetBSD's -[zZ] flags (which we had reversed). Compiling with this new ld will give you RRS warnings for libraries which do not contain .type infomation - these wsarnings are harmless and will go away as soon as you recompile your libraries (cd /usr/src; make libraries).
1994-02-13 20:43:13 +00:00
{
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
const char *err;
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
err = dlerror_msg;
dlerror_msg = NULL; /* Next call will return NULL */
return err;
}
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
static void
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
__dlexit __P((void))
{
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
#ifdef DEBUG
xprintf("__dlexit called\n");
#endif
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
This release is a moderate restructuring of the dynamic linker. It addresses a number of problems that were present in earlier versions. The calls to the "init" and "fini" functions of shared libraries have been reordered, so that they are called in a strictly nested fashion, as is required for C++ constructors and destructors. In addition, the "init" functions are called in better order relative to each other. That makes the system more tolerant of C++ programs which depend on a library's being initialized before its clients. The dynamic linker is now more tolerant of shared libraries in which dependencies on other shared libraries are incompletely recorded. Cleanup in the event of errors has been improved throughout the dynamic linker. A number of memory leaks were eliminated. The warning message for a shared library whose minor version number is too old has been clarified. The code dealing with the "ld.so.hints" file has been cleaned up. A bug that caused the hints file to be unmapped incompletely has been fixed. A different bug that could potentially cause the hints file to be mapped on top of a loaded object has been fixed. The code that searches for shared libraries has been cleaned up. The searching is now more compatible with that done by SunOS and SVR4. Also, some unnecessary and useless searches of both the hints file and library directories have been eliminated. Reviewed by: nate@freebsd.org
1996-01-13 00:15:25 +00:00
unmap_object(link_map_head, 1);
Change ld.so to correctly load dependant libraries for dlopen and unload them on dlclose. Also correctly call constructors and destructors for libraries linked with /usr/lib/c++rt0.o. Change interpretation of dlopen manpage to call _init() rather than init() for dlopened objects. Change c++rt0.o to avoid using atexit to call destructors, allowing dlclose to call destructors when an object is unloaded. Change interface between crt0 and ld.so to allow crt0 to call a function on exit to call destructors for shared libraries explicitly. These changes are backwards compatible. Old binaries will work with the new ld.so and new binaries will work with the old ld.so. A version number has been introduced in the crt0-ld.so interface to allow for future changes. Reviewed by: GAWollman, Craig Struble <cstruble@singularity.bevc.blacksburg.va.us>
1995-06-27 09:53:27 +00:00
}
If errors occur during the loading of the shared libraries required by the main program, report them directly from the dynamic linker and die there, rather than returning an error message to crt0.o. This enables the printing of error messages even for old executables, whose version of crt0.o is not able to print them. This fix closes PR bin/1869. The code in crt0.o for printing error messages from the dynamic linker is no longer used, because of this change. But it must remain, for backward compatibility with older dynamic linkers.
1996-10-24 16:24:19 +00:00
/*
* Print the current error message and exit with failure status.
*/
static void
die __P((void))
{
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
const char *msg;
If errors occur during the loading of the shared libraries required by the main program, report them directly from the dynamic linker and die there, rather than returning an error message to crt0.o. This enables the printing of error messages even for old executables, whose version of crt0.o is not able to print them. This fix closes PR bin/1869. The code in crt0.o for printing error messages from the dynamic linker is no longer used, because of this change. But it must remain, for backward compatibility with older dynamic linkers.
1996-10-24 16:24:19 +00:00
fprintf(stderr, "ld.so failed");
if ((msg = __dlerror()) != NULL)
fprintf(stderr, ": %s", msg);
putc('\n', stderr);
_exit(1);
}
Support for more Sun compatible dlopen() and friends. Also added proper error handling. Reviewed by: gj Submitted by: Mark Diekhans <markd@grizzly.com>
1995-02-07 13:33:42 +00:00
/*
* Generate an error message that can be later be retrieved via dlerror.
*/
static void
#if __STDC__
generror(char *fmt, ...)
#else
generror(fmt, va_alist)
char *fmt;
#endif
{
va_list ap;
#if __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
vsnprintf (dlerror_buf, DLERROR_BUF_SIZE, fmt, ap);
dlerror_msg = dlerror_buf;
va_end(ap);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
}
void
#if __STDC__
xprintf(char *fmt, ...)
#else
xprintf(fmt, va_alist)
char *fmt;
#endif
{
char buf[256];
va_list ap;
#if __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
vsnprintf(buf, sizeof(buf), fmt, ap);
Imported NetBSD's ld for shared libs.
1993-11-03 23:41:59 +00:00
(void)write(1, buf, strlen(buf));
va_end(ap);
}
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
/*
* rt_readenv() etc.
*
* Do a sweep over the environment once only, pick up what
* looks interesting.
*
* This is pretty obscure, but is relatively simple. Simply
* look at each environment variable, if it starts with "LD_" then
* look closer at it. If it's in our table, set the variable
* listed. effectively, this is like:
* ld_preload = careful ? NULL : getenv("LD_PRELOAD");
* except that the environment is scanned once only to pick up all
* known variables, rather than scanned multiple times for each
* variable.
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
*
* If an environment variable of interest is set to the empty string, we
* treat it as if it were unset.
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
*/
#define L(n, u, v) { n, sizeof(n) - 1, u, v },
struct env_scan_tab {
char *name;
int len;
int unsafe;
char **value;
} scan_tab[] = {
L("LD_LIBRARY_PATH=", 1, &ld_library_path)
L("LD_PRELOAD=", 1, &ld_preload)
Pay attention to the environment variable "LD_IGNORE_MISSING_OBJECTS". If it is set to a nonempty string, then simply skip any missing shared libraries. This came up in a discussion long ago as a potentially useful feature at sysinstall time. For example, an X11 utility could be used without the X libraries being present, provided the utility had a mode in which no X functions were actually called.
1997-01-17 20:22:18 +00:00
L("LD_IGNORE_MISSING_OBJECTS=", 1, &ld_ignore_missing_objects)
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
L("LD_TRACE_LOADED_OBJECTS=", 0, &ld_tracing)
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
L("LD_BIND_NOW=", 0, &ld_bind_now)
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
L("LD_SUPPRESS_WARNINGS=", 0, &ld_suppress_warnings)
L("LD_WARN_NON_PURE_CODE=", 0, &ld_warn_non_pure_code)
Many places in the code NULL is used in integer context, where plain 0 should be used. This happens to work because we #define NULL to 0, but is stylistically wrong and can cause problems for people trying to port bits of code to other environments. PR: 2752 Submitted by: Arne Henrik Juul <arnej@imf.unit.no>
1997-09-18 14:08:40 +00:00
{ NULL, 0, 0, NULL }
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
};
#undef L
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
static void
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
rt_readenv()
{
char **p = environ;
char *v;
struct env_scan_tab *t;
/* for each string in the environment... */
while ((v = *p++)) {
/* check for LD_xxx */
if (v[0] != 'L' || v[1] != 'D' || v[2] != '_')
continue;
for (t = scan_tab; t->name; t++) {
if (careful && t->unsafe)
continue; /* skip for set[ug]id */
if (strncmp(t->name, v, t->len) == 0) {
Add support for the LD_BIND_NOW environment variable. If it is set to a nonempty string, then function calls are relocated at program start-up rather than lazily. This variable is standard on Sun and SVR4 systems. The dlopen() function now supports both lazy and immediate binding, as determined by its "mode" argument, which can be either 1 (RTLD_LAZY) or 2 (RTLD_NOW). I will add defines of these symbols to <dlfcn.h> as soon as I've done a little more checking to make sure they won't cause collisions or bootstrapping problems that would break "make world". The "LD_*" environment variables which alter dynamic linker behavior are now treated as unset if they are set to the empty string. This agrees with the standard SVR4 conventions for the dynamic linker. Add a work-around for programs compiled with certain buggy versions of crt0.o. The buggy versions failed to set the "crt_ldso" member of the interface structure. This caused certain error messages from the dynamic linker to begin with "(null)" instead of the pathname of the dynamic linker.
1997-01-12 00:16:36 +00:00
if (*(v + t->len) != '\0') /* Not empty */
*t->value = v + t->len;
Update to handle new version ld.so.hints and info in executable for configurable fallback search paths, as well as new crt interface version. Also: - even faster getenv(), get all environment variable settings in a single pass. - ldd printf-like format specifications - minor code cleanups, one vsprintf -> vsnprintf (harmless) The library search sequence is a little more complete now. Before, it'd search $LD_LIBRARY_PATH (by opendir/readdir/closedir), then read the hints file, then read /usr/lib (again by scanning thr directory). It would then fail if there was no "found" library. Now, it does LD_LIBRARY_PATH and the hints file the same, but then uses a longer fallback path. The -R path is fetched from the executable if specified at build time, the ldconfig path is appended, and /usr/lib is appended to that. Duplicates are suppressed. This means that simply placing a new library in /usr/local/lib will work (the same as it did in /usr/lib) without needing ldconfig -m. It will find it quicker if the ldconfig is run though. Similar changes have been made to the NetBSD ld.so, but ours is rather different now due to John Polstra's speedups and fixes from a while back. The ldd printf-like format support came direct from NetBSD. Reviewed by: nate, jdp
1996-10-01 01:52:03 +00:00
break;
}
}
}
}
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
/*
* Malloc implementation for use within the dynamic linker. At first
* we do a simple allocation using sbrk. After the user's program
* has been loaded, we switch to using whatever malloc functions are
* defined there.
*/
/* Symbols related to the sbrk and brk implementations. */
#define CURBRK_SYM "curbrk"
#define MINBRK_SYM "minbrk"
#define END_SYM "_end"
/* Symbols related to malloc. */
#define FREE_SYM "_free"
#define MALLOC_SYM "_malloc"
#define REALLOC_SYM "_realloc"
/* Hooks into the implementation of sbrk and brk. */
extern char *curbrk __asm__(CURBRK_SYM);
extern char *minbrk __asm__(MINBRK_SYM);
/* Pointers to the user program's malloc functions. */
static void *(*p_malloc) __P((size_t));
static void *(*p_realloc) __P((void *, size_t));
static void (*p_free) __P((void *));
/* Upper limit of the memory allocated by our internal malloc. */
static char *rtld_alloc_lev;
/*
* Set up the internal malloc so that it will take its memory from the
* main program's sbrk arena.
*/
static void
Make emacs work again. This is a workaround for the fact that the emacs a.out file, self-generated by emacs's "unexec" function in "unexsunos4.c", is invalid. In particular, its "_end" symbol has the wrong value. The dynamic linker was using the value of that symbol to initialize its sbrk break level. The workaround is to peek at the executable's a.out header in memory, and calculate what "_end" should be based on the segment sizes. I will work out a fix for emacs and send it to the FSF. This dynamic linker workaround is still worthwhile, if only to avoid forcing all emacs users to build a new version. Note: xemacs gives a bogus warning at startup, for related reasons. The warning is harmless and can safely be ignored. I will send a patch to the xemacs maintainers to get rid of it, and meanwhile add a patch file to our port.
1997-12-05 02:06:37 +00:00
init_internal_malloc __P((void))
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
{
Make emacs work again. This is a workaround for the fact that the emacs a.out file, self-generated by emacs's "unexec" function in "unexsunos4.c", is invalid. In particular, its "_end" symbol has the wrong value. The dynamic linker was using the value of that symbol to initialize its sbrk break level. The workaround is to peek at the executable's a.out header in memory, and calculate what "_end" should be based on the segment sizes. I will work out a fix for emacs and send it to the FSF. This dynamic linker workaround is still worthwhile, if only to avoid forcing all emacs users to build a new version. Note: xemacs gives a bogus warning at startup, for related reasons. The warning is harmless and can safely be ignored. I will send a patch to the xemacs maintainers to get rid of it, and meanwhile add a patch file to our port.
1997-12-05 02:06:37 +00:00
const struct exec *hdr;
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
/*
* Before anything calls sbrk or brk, we have to initialize
Make emacs work again. This is a workaround for the fact that the emacs a.out file, self-generated by emacs's "unexec" function in "unexsunos4.c", is invalid. In particular, its "_end" symbol has the wrong value. The dynamic linker was using the value of that symbol to initialize its sbrk break level. The workaround is to peek at the executable's a.out header in memory, and calculate what "_end" should be based on the segment sizes. I will work out a fix for emacs and send it to the FSF. This dynamic linker workaround is still worthwhile, if only to avoid forcing all emacs users to build a new version. Note: xemacs gives a bogus warning at startup, for related reasons. The warning is harmless and can safely be ignored. I will send a patch to the xemacs maintainers to get rid of it, and meanwhile add a patch file to our port.
1997-12-05 02:06:37 +00:00
* its idea of the current break level to just beyond the main
* program's address space. Strictly speaking, the right
* way to do that is to look up the value of "_end" in the
* application's run time symbol table.
*
* That is what we used to do, and it works correctly for
* every valid program. Unfortunately, it doesn't work right
* for "unexec"ed versions of emacs. They are incorrectly
* generated with a wrong value for "_end". (xemacs gets it
* right.)
*
* To work around this, we peek at the exec header to get the
* sizes of the text, data, and bss segments. Luckily, the
* header is in memory at the start of the first mapped page.
* From the segment sizes, we can calculate a proper initial
* value for the break level.
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
*/
Make emacs work again. This is a workaround for the fact that the emacs a.out file, self-generated by emacs's "unexec" function in "unexsunos4.c", is invalid. In particular, its "_end" symbol has the wrong value. The dynamic linker was using the value of that symbol to initialize its sbrk break level. The workaround is to peek at the executable's a.out header in memory, and calculate what "_end" should be based on the segment sizes. I will work out a fix for emacs and send it to the FSF. This dynamic linker workaround is still worthwhile, if only to avoid forcing all emacs users to build a new version. Note: xemacs gives a bogus warning at startup, for related reasons. The warning is harmless and can safely be ignored. I will send a patch to the xemacs maintainers to get rid of it, and meanwhile add a patch file to our port.
1997-12-05 02:06:37 +00:00
hdr = (const struct exec *)PAGSIZ;
if (N_BADMAG(*hdr)) /* Sanity check */
errx(1, "Cannot find program's a.out header");
rtld_alloc_lev = curbrk = minbrk =
(char *)hdr + hdr->a_text + hdr->a_data + hdr->a_bss;
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
}
/*
* Set things up so that the dynamic linker can use the program's
* malloc functions.
*/
static void
init_external_malloc __P((void))
{
/*
* Patch the program's idea of the current break address to
* what it really is as a result of the allocations we have
* already done.
*/
*(char **)(sym_addr(CURBRK_SYM)) = curbrk;
Make emacs work again. This is a workaround for the fact that the emacs a.out file, self-generated by emacs's "unexec" function in "unexsunos4.c", is invalid. In particular, its "_end" symbol has the wrong value. The dynamic linker was using the value of that symbol to initialize its sbrk break level. The workaround is to peek at the executable's a.out header in memory, and calculate what "_end" should be based on the segment sizes. I will work out a fix for emacs and send it to the FSF. This dynamic linker workaround is still worthwhile, if only to avoid forcing all emacs users to build a new version. Note: xemacs gives a bogus warning at startup, for related reasons. The warning is harmless and can safely be ignored. I will send a patch to the xemacs maintainers to get rid of it, and meanwhile add a patch file to our port.
1997-12-05 02:06:37 +00:00
/*
* Set the minimum break level too. Otherwise, "unexec"ed
* emacs sets the break too low and wipes out our tables of
* shared objects.
*/
*(char **)(sym_addr(MINBRK_SYM)) = curbrk;
Get rid of the dynamic linker's internal malloc package, and arrange things so that it uses the same malloc as is used by the program being executed. This has several advantages, the big one being that you can now debug core dumps from dynamically linked programs and get useful information out of them. Until now, that didn't work. The internal malloc package placed the tables describing the loaded shared libraries in a mapped region of high memory that was not written to core files. Thus the debugger had no way of determining what was loaded where in memory. Now that the dynamic linker uses the application's malloc package (normally, but not necessarily, the system malloc), its tables end up in the regular heap area where they will be included in core dumps. The debugger now works very well indeed, thank you very much. Also ... Bring the program a little closer to conformance with style(9). There is still a long way to go. Add minimal const correctness changes to get rid of compiler warnings caused by the recent const changes in <dlfcn.h> and <link.h>. Improve performance by eliminating redundant calculations of symbols' hash values.
1997-11-29 03:32:48 +00:00
/*
* Set up pointers to the program's allocation functions, so
* that we can use them from now on.
*/
p_malloc = (void *(*)(size_t))(sym_addr(MALLOC_SYM));
p_free = (void (*)(void *))(sym_addr(FREE_SYM));
p_realloc = (void *(*)(void *, size_t))(sym_addr(REALLOC_SYM));
}
void *
malloc(size)
size_t size;
{
char *p;
/* If we are far enough along, we can use the system malloc. */
if (p_malloc != NULL)
return (*p_malloc)(size);
/*
* Otherwise we use our simple built-in malloc. We get the
* memory from brk() in increments of one page. We store the
* allocated size in the first word, so that realloc can be
* made to work.
*/
if (rtld_alloc_lev == NULL)
errx(1, "Internal error: internal malloc called before"
" being initialized");
p = (char *)ALIGN(rtld_alloc_lev);
rtld_alloc_lev = p + sizeof(size_t) + size;
if (rtld_alloc_lev > curbrk) { /* Get memory from system */
char *newbrk;
newbrk = (char *)
roundup2((unsigned long)rtld_alloc_lev, PAGSIZ);
if (brk(newbrk) == (char *)-1)
return NULL;
}
*(size_t *)p = size;
return p + sizeof(size_t);
}
void *
realloc(ptr, size)
void *ptr;
size_t size;
{
size_t old_size;
void *new_ptr;
if (ptr == NULL)
return malloc(size);
/*
* If we are far enough along, and if the memory originally came
* from the system malloc, we can use the system realloc.
*/
if (p_realloc != NULL && (char *)ptr >= rtld_alloc_lev)
return (*p_realloc)(ptr, size);
old_size = *((size_t *)ptr - 1);
if (old_size >= size) /* Not expanding the region */
return ptr;
new_ptr = malloc(size);
if (new_ptr != NULL)
memcpy(new_ptr, ptr, old_size);
return new_ptr;
}
void
free(ptr)
void *ptr;
{
if (ptr == NULL)
return;
/*
* If we are far enough along, and if the memory originally came
* from the system malloc, we can use the system free. Otherwise
* we can't free the memory and we just let it go to waste.
*/
if (p_free != NULL && (char *)ptr >= rtld_alloc_lev)
(*p_free)(ptr);
}
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