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3c0a9567e5
Add a -Bforcedynamic option which generates a dynamic object even if no shared libraries were given in the link. Make RRS in text section warnings conditional on "-assert pure-text" so that I can link non-PIC kernel modules without tons of link errors. Changes to bsd.lib.mk to follow. Fix a couple of bugs exposed by the fact that the kernel is not linked at zero. Reviewed by: jdp
1273 lines
33 KiB
C
1273 lines
33 KiB
C
/*
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* Copyright (c) 1993 Paul Kranenburg
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Paul Kranenburg.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $Id: rrs.c,v 1.21 1997/04/25 15:26:12 jdp Exp $
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/file.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <err.h>
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#include <fcntl.h>
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#include <ar.h>
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#include <ranlib.h>
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#include <a.out.h>
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#include <stab.h>
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#include <string.h>
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#include "ld.h"
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#include "dynamic.h"
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static struct _dynamic rrs_dyn; /* defined in link.h */
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static struct so_debug rrs_so_debug; /* defined in link.h */
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static struct section_dispatch_table rrs_sdt; /* defined in link.h */
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static got_t *rrs_got;
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static jmpslot_t *rrs_plt; /* defined in md.h */
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static struct relocation_info *rrs_reloc;
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static struct nzlist *rrs_symbols; /* RRS symbol table */
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static char *rrs_strtab; /* RRS strings */
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static struct rrs_hash *rrs_hashtab; /* RT hash table */
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static struct shobj *rrs_shobjs;
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char *rrs_search_paths; /* `-L' RT search */
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static int rrs_search_paths_size;
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static int reserved_rrs_relocs;
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static int claimed_rrs_relocs;
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static int discarded_rrs_relocs;
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static int number_of_gotslots = 1;
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static int number_of_jmpslots = 1;
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static int number_of_rrs_hash_entries;
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static int number_of_rrs_symbols;
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static int rrs_strtab_size;
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static int rrs_symbol_size;
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static int current_jmpslot_offset;
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static int current_got_offset;
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static int max_got_offset;
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static int min_got_offset;
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static int got_origin;
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static int current_reloc_offset;
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static int current_hash_index;
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int number_of_shobjs;
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/* Convert a GOT offset into a table entry */
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#define GOTP(off) ((got_t *)((long)rrs_got + got_origin + (off)))
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struct shobj {
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struct shobj *next;
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struct file_entry *entry;
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};
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/*
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RRS text segment:
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+-------------------+ <-- sdt_rel (rrs_text_start)
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| |
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| relocation |
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| |
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+-------------------+ <-- <sdt>.sdt_hash
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| |
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| hash buckets |
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+-------------------+ <-- <sdt>.sdt_nzlist
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| |
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| symbols |
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+-------------------+ <-- <sdt>.sdt_strings
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| |
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| strings |
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+-------------------+ <-- <sdt>.sdt_sods
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| |
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| shobjs |
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+-------------------+
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| |
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| shobjs strings | <-- <shobj>.sod_name
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+-------------------+
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RRS data segment:
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+-------------------+ <-- __DYNAMIC (rrs_data_start)
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| |
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| _dymamic |
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| |
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+-------------------+ <-- __DYNAMIC.d_debug
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| |
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| so_debug |
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| |
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+-------------------+ <-- __DYNAMIC.d_un.d_sdt
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| |
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| sdt |
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+-------------------+ <-- sdt_got
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| |
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| _GOT_ | <-- _GLOBAL_OFFSET_TABLE_
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| | ( == sdt_got + got_origin)
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| |
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+-------------------+ <-- sdt_plt
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| |
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| PLT |
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+-------------------+
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*/
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/*
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* Add NAME to the list of needed run-time objects.
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* Return 1 if ENTRY was added to the list.
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*/
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int
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rrs_add_shobj(entry)
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struct file_entry *entry;
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{
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struct shobj **p;
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for (p = &rrs_shobjs; *p != NULL; p = &(*p)->next)
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if (strcmp((*p)->entry->filename, entry->filename) == 0)
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return 0;
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*p = (struct shobj *)xmalloc(sizeof(struct shobj));
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(*p)->next = NULL;
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(*p)->entry = entry;
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number_of_shobjs++;
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return 1;
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}
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void
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alloc_rrs_reloc(entry, sp)
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struct file_entry *entry;
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symbol *sp;
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{
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#ifdef DEBUG
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printf("alloc_rrs_reloc: %s in %s\n", demangle(sp->name), get_file_name(entry));
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#endif
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reserved_rrs_relocs++;
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}
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void
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alloc_rrs_segment_reloc(entry, r)
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struct file_entry *entry;
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struct relocation_info *r;
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{
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#ifdef DEBUG
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printf("alloc_rrs_segment_reloc at %#x in %s\n",
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r->r_address, get_file_name(entry));
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#endif
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reserved_rrs_relocs++;
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}
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void
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alloc_rrs_jmpslot(entry, sp)
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struct file_entry *entry;
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symbol *sp;
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{
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if (sp->flags & GS_HASJMPSLOT)
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return;
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sp->flags |= GS_HASJMPSLOT;
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number_of_jmpslots++;
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reserved_rrs_relocs++;
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}
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void
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alloc_rrs_gotslot(entry, r, lsp)
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struct file_entry *entry;
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struct relocation_info *r;
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struct localsymbol *lsp;
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{
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symbol *sp = lsp->symbol;
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if (!RELOC_EXTERN_P(r)) {
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if (sp != NULL) {
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warnx("%s: relocation for internal symbol "
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"expected at %#x",
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get_file_name(entry), RELOC_ADDRESS(r));
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return;
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}
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if (!RELOC_STATICS_THROUGH_GOT_P(r))
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/* No need for a GOT slot */
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return;
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if (lsp->flags & LS_HASGOTSLOT)
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return;
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lsp->flags |= LS_HASGOTSLOT;
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} else {
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if (sp == NULL) {
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warnx("%s: relocation must refer "
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"to global symbol at %#x",
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get_file_name(entry), RELOC_ADDRESS(r));
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return;
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}
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if (sp->alias)
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sp = sp->alias;
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if (sp->flags & GS_HASGOTSLOT)
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return;
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sp->flags |= GS_HASGOTSLOT;
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}
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number_of_gotslots++;
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reserved_rrs_relocs++;
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}
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void
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alloc_rrs_cpy_reloc(entry, sp)
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struct file_entry *entry;
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symbol *sp;
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{
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if (sp->flags & GS_CPYRELOCRESERVED)
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return;
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#ifdef DEBUG
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printf("alloc_rrs_copy: %s in %s\n", demangle(sp->name), get_file_name(entry));
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#endif
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sp->flags |= GS_CPYRELOCRESERVED;
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reserved_rrs_relocs++;
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}
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static struct relocation_info *
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rrs_next_reloc()
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{
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struct relocation_info *r;
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r = rrs_reloc + claimed_rrs_relocs++;
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if (claimed_rrs_relocs > reserved_rrs_relocs)
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errx(1, "internal error: RRS relocs exceed allocation %d",
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reserved_rrs_relocs);
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return r;
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}
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/*
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* Claim a RRS relocation as a result of a regular (ie. non-PIC)
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* relocation record in a rel file.
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*
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* Return 1 if the output file needs no further updating.
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* Return 0 if the relocation value pointed to by RELOCATION must
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* written to a.out.
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*/
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int
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claim_rrs_reloc(entry, rp, sp, relocation)
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struct file_entry *entry;
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struct relocation_info *rp;
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symbol *sp;
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long *relocation;
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{
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struct relocation_info *r = rrs_next_reloc();
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if (rp->r_address < text_start + text_size
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&& (link_mode & WARNRRSTEXT))
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warnx("%s: RRS text relocation at %#x for \"%s\"",
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get_file_name(entry), rp->r_address, demangle(sp->name));
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#ifdef DEBUG
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printf("claim_rrs_reloc: %s in %s\n", demangle(sp->name), get_file_name(entry));
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#endif
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r->r_address = rp->r_address;
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r->r_symbolnum = sp->rrs_symbolnum;
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if (link_mode & SYMBOLIC) {
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if (!sp->defined)
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warnx("Cannot reduce symbol \"%s\" in %s",
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demangle(sp->name), get_file_name(entry));
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RELOC_EXTERN_P(r) = 0;
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*relocation += sp->value;
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(void) md_make_reloc(rp, r, RELTYPE_RELATIVE);
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return 0;
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} else {
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RELOC_EXTERN_P(r) = 1;
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return md_make_reloc(rp, r, RELTYPE_EXTERN);
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}
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}
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/*
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* Claim a jmpslot. Setup RRS relocation if claimed for the first time.
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*/
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long
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claim_rrs_jmpslot(entry, rp, sp, addend)
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struct file_entry *entry;
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struct relocation_info *rp;
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symbol *sp;
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long addend;
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{
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struct relocation_info *r;
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if (!(sp->flags & GS_HASJMPSLOT))
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errx(1, "internal error: "
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"%s: claim_rrs_jmpslot: %s: no reservation",
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get_file_name(entry),
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demangle(sp->name));
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if (sp->jmpslot_offset != -1)
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return rrs_sdt.sdt_plt + sp->jmpslot_offset;
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sp->jmpslot_offset = current_jmpslot_offset;
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current_jmpslot_offset += sizeof(jmpslot_t);
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#ifdef DEBUG
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printf("claim_rrs_jmpslot: %s: %s(%d) -> offset %x\n",
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get_file_name(entry),
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demangle(sp->name), sp->rrs_symbolnum, sp->jmpslot_offset);
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#endif
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if ((link_mode & SYMBOLIC) || rrs_section_type == RRS_PARTIAL) {
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if (!sp->defined)
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warnx("Cannot reduce symbol \"%s\" in %s",
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demangle(sp->name), get_file_name(entry));
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md_fix_jmpslot( rrs_plt + sp->jmpslot_offset/sizeof(jmpslot_t),
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rrs_sdt.sdt_plt + sp->jmpslot_offset,
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sp->value);
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if (rrs_section_type == RRS_PARTIAL || !JMPSLOT_NEEDS_RELOC) {
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/* PLT is self-contained */
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discarded_rrs_relocs++;
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return rrs_sdt.sdt_plt + sp->jmpslot_offset;
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}
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} else {
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md_make_jmpslot(rrs_plt + sp->jmpslot_offset/sizeof(jmpslot_t),
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sp->jmpslot_offset,
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claimed_rrs_relocs);
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}
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/*
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* Install a run-time relocation for this PLT entry.
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*/
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r = rrs_next_reloc();
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RELOC_SYMBOL(r) = sp->rrs_symbolnum;
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r->r_address = (long)rrs_sdt.sdt_plt + sp->jmpslot_offset;
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if (link_mode & SYMBOLIC) {
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RELOC_EXTERN_P(r) = 0;
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md_make_jmpreloc(rp, r, RELTYPE_RELATIVE);
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} else {
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RELOC_EXTERN_P(r) = 1;
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md_make_jmpreloc(rp, r, 0);
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}
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return rrs_sdt.sdt_plt + sp->jmpslot_offset;
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}
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/*
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* Claim GOT entry for a global symbol. If this is the first relocation
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* claiming the entry, setup a RRS relocation for it.
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* Return offset into the GOT allocated to this symbol.
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*/
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long
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claim_rrs_gotslot(entry, rp, lsp, addend)
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struct file_entry *entry;
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struct relocation_info *rp;
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struct localsymbol *lsp;
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long addend;
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{
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struct relocation_info *r;
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symbol *sp = lsp->symbol;
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int reloc_type = 0;
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if (sp == NULL) {
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return 0;
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}
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if (sp->alias)
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sp = sp->alias;
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if (!(sp->flags & GS_HASGOTSLOT))
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errx(1, "internal error: "
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"%s: claim_rrs_gotslot: %s: no reservation",
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get_file_name(entry), demangle(sp->name));
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if (sp->gotslot_offset != -1) {
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#ifdef DIAGNOSTIC
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if (*GOTP(sp->gotslot_offset) != addend +
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((!(link_mode & SHAREABLE) || (link_mode & SYMBOLIC))
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? sp->value : 0))
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errx(1, "%s: %s: gotslot at %#x is multiple valued, "
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"*got = %#x, addend = %#x, sp->value = %#x",
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get_file_name(entry), demangle(sp->name),
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sp->gotslot_offset,
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*GOTP(sp->gotslot_offset), addend, sp->value);
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#endif
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/* This symbol already passed here before. */
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return sp->gotslot_offset;
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}
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if (current_got_offset == 0)
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/* GOT offset 0 is reserved */
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current_got_offset += sizeof(got_t);
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if (current_got_offset > max_got_offset)
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errx(1, "%s: GOT overflow on symbol `%s' at %#x",
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get_file_name(entry), demangle(sp->name), RELOC_ADDRESS(rp));
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sp->gotslot_offset = current_got_offset;
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current_got_offset += sizeof(got_t);
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#ifdef DEBUG
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printf("claim_rrs_gotslot: %s(%d,%#x) slot offset %#x, addend %#x\n",
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demangle(sp->name), sp->rrs_symbolnum, sp->value, sp->gotslot_offset, addend);
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#endif
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if (sp->defined &&
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(!(link_mode & SHAREABLE) || (link_mode & SYMBOLIC))) {
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/*
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* Reduce to just a base-relative translation.
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*/
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*GOTP(sp->gotslot_offset) = sp->value + addend;
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reloc_type = RELTYPE_RELATIVE;
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} else if ((link_mode & SYMBOLIC) || rrs_section_type == RRS_PARTIAL) {
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/*
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* SYMBOLIC: all symbols must be known.
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* RRS_PARTIAL: we don't link against shared objects,
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* so again all symbols must be known.
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*/
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warnx("Cannot reduce symbol \"%s\" in %s",
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demangle(sp->name), get_file_name(entry));
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} else {
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/*
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* This gotslot will be updated with symbol value at run-time.
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*/
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*GOTP(sp->gotslot_offset) = addend;
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}
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if (rrs_section_type == RRS_PARTIAL) {
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/*
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* Base address is known, gotslot should be fully
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* relocated by now.
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* NOTE: RRS_PARTIAL implies !SHAREABLE.
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*/
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if (!sp->defined)
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warnx("Cannot reduce symbol \"%s\" in %s",
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demangle(sp->name), get_file_name(entry));
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discarded_rrs_relocs++;
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return sp->gotslot_offset;
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}
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/*
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* Claim a relocation entry.
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* If symbol is defined and in "main" (!SHAREABLE)
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|
* we still put out a relocation as we cannot easily
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* undo the allocation.
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* `RELTYPE_RELATIVE' relocations have the external bit off
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* as no symbol need be looked up at run-time.
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|
*/
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r = rrs_next_reloc();
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r->r_address = got_symbol->value + sp->gotslot_offset;
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RELOC_SYMBOL(r) = sp->rrs_symbolnum;
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RELOC_EXTERN_P(r) = !(reloc_type == RELTYPE_RELATIVE);
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md_make_gotreloc(rp, r, reloc_type);
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return sp->gotslot_offset;
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}
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/*
|
|
* Claim a GOT entry for a static symbol. Return offset of the
|
|
* allocated GOT entry. If RELOC_STATICS_THROUGH_GOT_P is in effect,
|
|
* return the offset of the symbol with respect to the *location* of
|
|
* the GOT.
|
|
*/
|
|
long
|
|
claim_rrs_internal_gotslot(entry, rp, lsp, addend)
|
|
struct file_entry *entry;
|
|
struct relocation_info *rp;
|
|
struct localsymbol *lsp;
|
|
long addend;
|
|
{
|
|
struct relocation_info *r;
|
|
|
|
addend += lsp->nzlist.nz_value;
|
|
|
|
if (!RELOC_STATICS_THROUGH_GOT_P(r))
|
|
return addend - got_symbol->value;
|
|
|
|
if (!(lsp->flags & LS_HASGOTSLOT))
|
|
errx(1, "internal error: "
|
|
"%s: claim_rrs_internal_gotslot at %#x: no reservation",
|
|
get_file_name(entry), RELOC_ADDRESS(rp));
|
|
|
|
if (lsp->gotslot_offset != -1) {
|
|
/* Already claimed */
|
|
if (*GOTP(lsp->gotslot_offset) != addend)
|
|
errx(1, "%s: gotslot at %#x is multiple valued",
|
|
get_file_name(entry), lsp->gotslot_offset);
|
|
return lsp->gotslot_offset;
|
|
}
|
|
|
|
if (current_got_offset == 0)
|
|
/* GOT offset 0 is reserved */
|
|
current_got_offset += sizeof(got_t);
|
|
|
|
if (current_got_offset > max_got_offset)
|
|
errx(1, "%s: GOT overflow for relocation at %#x",
|
|
get_file_name(entry), RELOC_ADDRESS(rp));
|
|
|
|
lsp->gotslot_offset = current_got_offset;
|
|
current_got_offset += sizeof(got_t);
|
|
|
|
*GOTP(lsp->gotslot_offset) = addend;
|
|
|
|
#ifdef DEBUG
|
|
printf("claim_rrs_internal_gotslot: %s: slot offset %#x, addend = %#x\n",
|
|
get_file_name(entry), lsp->gotslot_offset, addend);
|
|
#endif
|
|
|
|
if (rrs_section_type == RRS_PARTIAL) {
|
|
discarded_rrs_relocs++;
|
|
return lsp->gotslot_offset;
|
|
}
|
|
|
|
/*
|
|
* Relocation entry needed for this static GOT entry.
|
|
*/
|
|
r = rrs_next_reloc();
|
|
r->r_address = got_symbol->value + lsp->gotslot_offset;
|
|
RELOC_EXTERN_P(r) = 0;
|
|
md_make_gotreloc(rp, r, RELTYPE_RELATIVE);
|
|
return lsp->gotslot_offset;
|
|
}
|
|
|
|
void
|
|
claim_rrs_cpy_reloc(entry, rp, sp)
|
|
struct file_entry *entry;
|
|
struct relocation_info *rp;
|
|
symbol *sp;
|
|
{
|
|
struct relocation_info *r;
|
|
|
|
if (sp->flags & GS_CPYRELOCCLAIMED)
|
|
return;
|
|
|
|
if (!(sp->flags & GS_CPYRELOCRESERVED))
|
|
errx(1, "internal error: "
|
|
"%s: claim_cpy_reloc: %s: no reservation",
|
|
get_file_name(entry), demangle(sp->name));
|
|
|
|
#ifdef DEBUG
|
|
printf("claim_rrs_copy: %s: %s -> %x\n",
|
|
get_file_name(entry), demangle(sp->name), sp->so_defined);
|
|
#endif
|
|
|
|
r = rrs_next_reloc();
|
|
sp->flags |= GS_CPYRELOCCLAIMED;
|
|
r->r_address = rp->r_address;
|
|
RELOC_SYMBOL(r) = sp->rrs_symbolnum;
|
|
RELOC_EXTERN_P(r) = RELOC_EXTERN_P(rp);
|
|
md_make_cpyreloc(rp, r);
|
|
}
|
|
|
|
void
|
|
claim_rrs_segment_reloc(entry, rp)
|
|
struct file_entry *entry;
|
|
struct relocation_info *rp;
|
|
{
|
|
struct relocation_info *r = rrs_next_reloc();
|
|
|
|
#ifdef DEBUG
|
|
printf("claim_rrs_segment_reloc: %s at %#x\n",
|
|
get_file_name(entry), rp->r_address);
|
|
#endif
|
|
|
|
r->r_address = rp->r_address;
|
|
RELOC_TYPE(r) = RELOC_TYPE(rp);
|
|
RELOC_EXTERN_P(r) = 0;
|
|
md_make_reloc(rp, r, RELTYPE_RELATIVE);
|
|
|
|
}
|
|
|
|
/*
|
|
* Fill the RRS hash table for the given symbol name.
|
|
* NOTE: the hash value computation must match the one in rtld.
|
|
*/
|
|
void
|
|
rrs_insert_hash(cp, index)
|
|
char *cp;
|
|
int index;
|
|
{
|
|
int hashval = 0;
|
|
struct rrs_hash *hp;
|
|
|
|
for (; *cp; cp++)
|
|
hashval = (hashval << 1) + *cp;
|
|
|
|
hashval = (hashval & 0x7fffffff) % rrs_sdt.sdt_buckets;
|
|
|
|
/* Get to the bucket */
|
|
hp = rrs_hashtab + hashval;
|
|
if (hp->rh_symbolnum == -1) {
|
|
/* Empty bucket, use it */
|
|
hp->rh_symbolnum = index;
|
|
hp->rh_next = 0;
|
|
return;
|
|
}
|
|
|
|
while (hp->rh_next != 0)
|
|
hp = rrs_hashtab + hp->rh_next;
|
|
|
|
hp->rh_next = current_hash_index++;
|
|
hp = rrs_hashtab + hp->rh_next;
|
|
hp->rh_symbolnum = index;
|
|
hp->rh_next = 0;
|
|
}
|
|
|
|
/*
|
|
* There are two interesting cases to consider here.
|
|
*
|
|
* 1) No shared objects were loaded, but there were PIC input rel files.
|
|
* In this case we must output a _GLOBAL_OFFSET_TABLE_ but no other
|
|
* RRS data. Also, the entries in the GOT must be fully resolved.
|
|
*
|
|
* 2) It's a genuine dynamically linked program, so the whole RRS scoop
|
|
* goes into a.out.
|
|
*/
|
|
void
|
|
consider_rrs_section_lengths()
|
|
{
|
|
int n;
|
|
struct shobj *shp;
|
|
|
|
#ifdef notyet
|
|
struct shobj **shpp;
|
|
/* We run into trouble with this as long as shared object symbols
|
|
are not checked for definitions */
|
|
/*
|
|
* First, determine the real number of shared objects we need.
|
|
*/
|
|
for (shpp = &rrs_shobjs; *shpp; shpp = &(*shpp)->next) {
|
|
while (*shpp && !((*shpp)->entry->flags & E_SYMBOLS_USED)) {
|
|
if (--number_of_shobjs < 0)
|
|
errx(1, "internal error: number_of_shobjs < 0");
|
|
*shpp = (*shpp)->next;
|
|
}
|
|
if (*shpp == NULL)
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
/* First, determine what of the RRS we want */
|
|
if (relocatable_output)
|
|
rrs_section_type = RRS_NONE;
|
|
else if (link_mode & SHAREABLE)
|
|
rrs_section_type = RRS_FULL;
|
|
else if (number_of_shobjs == 0 && !(link_mode & FORCEDYNAMIC)) {
|
|
/*
|
|
* First slots in both tables are reserved
|
|
* hence the "> 1" condition
|
|
*/
|
|
if (number_of_gotslots > 1 || number_of_jmpslots > 1)
|
|
rrs_section_type = RRS_PARTIAL;
|
|
else
|
|
rrs_section_type = RRS_NONE;
|
|
} else
|
|
rrs_section_type = RRS_FULL;
|
|
|
|
if (rrs_section_type == RRS_NONE) {
|
|
got_symbol->defined = 0;
|
|
if (reserved_rrs_relocs > 0)
|
|
errx(1, "internal error: empty RRS has reservations");
|
|
return;
|
|
}
|
|
|
|
rrs_symbol_size = LD_VERSION_NZLIST_P(soversion) ?
|
|
sizeof(struct nzlist) : sizeof(struct nlist);
|
|
|
|
/*
|
|
* If there is an entry point, __DYNAMIC must be referenced (usually
|
|
* from crt0), as this is the method used to determine whether the
|
|
* run-time linker must be called.
|
|
*/
|
|
if (!(link_mode & SHAREABLE) && !(dynamic_symbol->flags & GS_REFERENCED))
|
|
errx(1, "No reference to __DYNAMIC");
|
|
|
|
dynamic_symbol->flags |= GS_REFERENCED;
|
|
|
|
if (number_of_gotslots > 1)
|
|
got_symbol->flags |= GS_REFERENCED;
|
|
|
|
|
|
/* Next, allocate relocs, got and plt */
|
|
n = reserved_rrs_relocs * sizeof(struct relocation_info);
|
|
rrs_reloc = (struct relocation_info *)xmalloc(n);
|
|
bzero(rrs_reloc, n);
|
|
|
|
n = number_of_gotslots * sizeof(got_t);
|
|
rrs_got = (got_t *)xmalloc(n);
|
|
bzero(rrs_got, n);
|
|
|
|
n = number_of_jmpslots * sizeof(jmpslot_t);
|
|
rrs_plt = (jmpslot_t *)xmalloc(n);
|
|
bzero(rrs_plt, n);
|
|
|
|
/* Initialize first jmpslot */
|
|
md_fix_jmpslot(rrs_plt, 0, 0);
|
|
|
|
if (rrs_section_type == RRS_PARTIAL) {
|
|
rrs_data_size = number_of_gotslots * sizeof(got_t);
|
|
rrs_data_size += number_of_jmpslots * sizeof(jmpslot_t);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Walk the symbol table, assign RRS symbol numbers
|
|
* and calculate string space.
|
|
* Assign number 0 to __DYNAMIC (!! Sun compatibility)
|
|
*/
|
|
dynamic_symbol->rrs_symbolnum = number_of_rrs_symbols++;
|
|
FOR_EACH_SYMBOL(i ,sp) {
|
|
if ((link_mode & SHAREABLE) && sp->warning) {
|
|
/* Allocate N_WARNING & co */
|
|
rrs_strtab_size +=
|
|
2 + strlen(sp->name) + strlen(sp->warning);
|
|
number_of_rrs_symbols += 2;
|
|
}
|
|
|
|
if (!(sp->flags & GS_REFERENCED))
|
|
continue;
|
|
|
|
rrs_strtab_size += 1 + strlen(sp->name);
|
|
if (sp != dynamic_symbol)
|
|
sp->rrs_symbolnum = number_of_rrs_symbols++;
|
|
if (sp->alias) {
|
|
/*
|
|
* (sigh) Always allocate space to hold the
|
|
* indirection. At this point there's not
|
|
* enough information to decide whether it's
|
|
* actually needed or not.
|
|
*/
|
|
number_of_rrs_symbols++;
|
|
rrs_strtab_size += 1 + strlen(sp->alias->name);
|
|
}
|
|
} END_EACH_SYMBOL;
|
|
|
|
/*
|
|
* Now that we know how many RRS symbols there are going to be,
|
|
* allocate and initialize the RRS symbol hash table.
|
|
*/
|
|
rrs_sdt.sdt_buckets = number_of_rrs_symbols/4;
|
|
if (rrs_sdt.sdt_buckets < 4)
|
|
rrs_sdt.sdt_buckets = 4;
|
|
|
|
number_of_rrs_hash_entries = rrs_sdt.sdt_buckets +
|
|
number_of_rrs_symbols;
|
|
rrs_hashtab = (struct rrs_hash *)xmalloc(
|
|
number_of_rrs_hash_entries * sizeof(struct rrs_hash));
|
|
for (n = 0; n < rrs_sdt.sdt_buckets; n++)
|
|
rrs_hashtab[n].rh_symbolnum = -1;
|
|
current_hash_index = rrs_sdt.sdt_buckets;
|
|
|
|
/*
|
|
* Get symbols into hash table now, so we can fine tune the size
|
|
* of the latter. We adjust the value of `number_of_rrs_hash_entries'
|
|
* to the number of hash link slots actually used.
|
|
*/
|
|
FOR_EACH_SYMBOL(i ,sp) {
|
|
if (sp->flags & GS_REFERENCED)
|
|
rrs_insert_hash(sp->name, sp->rrs_symbolnum);
|
|
} END_EACH_SYMBOL;
|
|
number_of_rrs_hash_entries = current_hash_index;
|
|
|
|
/*
|
|
* Calculate RRS section sizes.
|
|
*/
|
|
rrs_data_size = sizeof(struct _dynamic);
|
|
rrs_data_size += sizeof(struct so_debug);
|
|
rrs_data_size += sizeof(struct section_dispatch_table);
|
|
rrs_data_size += number_of_gotslots * sizeof(got_t);
|
|
rrs_data_size += number_of_jmpslots * sizeof(jmpslot_t);
|
|
rrs_data_size = MALIGN(rrs_data_size);
|
|
|
|
rrs_text_size = reserved_rrs_relocs * sizeof(struct relocation_info);
|
|
rrs_text_size += number_of_rrs_hash_entries * sizeof(struct rrs_hash);
|
|
rrs_text_size += number_of_rrs_symbols * rrs_symbol_size;
|
|
rrs_search_paths_size = rrs_search_paths
|
|
? strlen(rrs_search_paths) + 1
|
|
: 0;
|
|
rrs_search_paths_size = MALIGN(rrs_search_paths_size);
|
|
rrs_text_size += rrs_search_paths_size;
|
|
|
|
/* Align strings size */
|
|
rrs_strtab_size = MALIGN(rrs_strtab_size);
|
|
rrs_text_size += rrs_strtab_size;
|
|
|
|
/* Process needed shared objects */
|
|
for (shp = rrs_shobjs; shp; shp = shp->next) {
|
|
char *name = shp->entry->local_sym_name;
|
|
|
|
if (*name == '-' && *(name+1) == 'l')
|
|
name += 2;
|
|
|
|
rrs_text_size += sizeof(struct sod);
|
|
rrs_text_size += 1 + strlen(name);
|
|
}
|
|
|
|
/* Finally, align size */
|
|
rrs_text_size = MALIGN(rrs_text_size);
|
|
}
|
|
|
|
void
|
|
relocate_rrs_addresses()
|
|
{
|
|
int gotsize;
|
|
|
|
dynamic_symbol->value = 0;
|
|
|
|
/*
|
|
* Get ready to allocate linkage table offsets.
|
|
* First jmpslot is reserved for the run-time binder
|
|
* GOT entry at offset 0 is reserved for `__DYNAMIC'.
|
|
*/
|
|
current_jmpslot_offset = sizeof(jmpslot_t);
|
|
current_got_offset = 0;
|
|
max_got_offset = MAX_GOTOFF(pic_type);
|
|
min_got_offset = MIN_GOTOFF(pic_type);
|
|
gotsize = number_of_gotslots * sizeof(got_t);
|
|
|
|
if (gotsize + min_got_offset - (int)sizeof(got_t) > max_got_offset)
|
|
warnx("Global Offset Table overflow (use `-fPIC')");
|
|
|
|
if (gotsize > max_got_offset)
|
|
/* Position at "two-complements" origin */
|
|
current_got_offset += min_got_offset;
|
|
|
|
got_origin = -current_got_offset;
|
|
|
|
if (rrs_section_type == RRS_NONE)
|
|
return;
|
|
|
|
if (rrs_section_type == RRS_PARTIAL) {
|
|
rrs_sdt.sdt_got = rrs_data_start;
|
|
got_symbol->value = rrs_sdt.sdt_got + got_origin;
|
|
rrs_sdt.sdt_plt = rrs_sdt.sdt_got +
|
|
number_of_gotslots * sizeof(got_t);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* RRS data relocations.
|
|
*/
|
|
rrs_dyn.d_version = soversion;
|
|
rrs_dyn.d_debug = (struct so_debug *)
|
|
(rrs_data_start + sizeof(struct _dynamic));
|
|
rrs_dyn.d_un.d_sdt = (struct section_dispatch_table *)
|
|
((long)rrs_dyn.d_debug + sizeof(struct so_debug));
|
|
|
|
rrs_sdt.sdt_got = (long)rrs_dyn.d_un.d_sdt +
|
|
sizeof(struct section_dispatch_table);
|
|
rrs_sdt.sdt_plt = rrs_sdt.sdt_got + number_of_gotslots*sizeof(got_t);
|
|
|
|
/*
|
|
* RRS text relocations.
|
|
*/
|
|
rrs_sdt.sdt_rel = rrs_text_start;
|
|
/*
|
|
* Sun BUG compatibility alert.
|
|
* Main program's RRS text values are relative to TXTADDR? WHY??
|
|
*/
|
|
#ifdef SUN_COMPAT
|
|
if (soversion == LD_VERSION_SUN && !(link_mode & SHAREABLE))
|
|
rrs_sdt.sdt_rel -= N_TXTADDR(outheader);
|
|
#endif
|
|
|
|
rrs_sdt.sdt_hash = rrs_sdt.sdt_rel +
|
|
reserved_rrs_relocs * sizeof(struct relocation_info);
|
|
rrs_sdt.sdt_nzlist = rrs_sdt.sdt_hash +
|
|
number_of_rrs_hash_entries * sizeof(struct rrs_hash);
|
|
rrs_sdt.sdt_strings = rrs_sdt.sdt_nzlist +
|
|
number_of_rrs_symbols * rrs_symbol_size;
|
|
rrs_sdt.sdt_paths = rrs_search_paths
|
|
? rrs_sdt.sdt_strings + rrs_strtab_size
|
|
: 0;
|
|
rrs_sdt.sdt_sods = rrs_shobjs
|
|
? rrs_sdt.sdt_strings + rrs_strtab_size +
|
|
rrs_search_paths_size
|
|
: 0;
|
|
rrs_sdt.sdt_filler2 = 0;
|
|
rrs_sdt.sdt_str_sz = rrs_strtab_size;
|
|
rrs_sdt.sdt_text_sz = text_size;
|
|
rrs_sdt.sdt_plt_sz = number_of_jmpslots * sizeof(jmpslot_t);
|
|
|
|
/*
|
|
* Assign addresses to _GLOBAL_OFFSET_TABLE_ and __DYNAMIC.
|
|
* The value `&__DYNAMIC' is in the GOT table at offset 0.
|
|
*/
|
|
got_symbol->value = rrs_sdt.sdt_got + got_origin;
|
|
*GOTP(0) = dynamic_symbol->value = rrs_data_start;
|
|
|
|
}
|
|
|
|
void
|
|
write_rrs_data()
|
|
{
|
|
long pos;
|
|
|
|
if (rrs_section_type == RRS_NONE)
|
|
return;
|
|
|
|
pos = rrs_data_start + N_TXTOFF(outheader) - text_start;
|
|
if (fseek(outstream, pos, SEEK_SET) != 0)
|
|
err(1, "write_rrs_data: fseek");
|
|
|
|
if (rrs_section_type == RRS_PARTIAL) {
|
|
/*
|
|
* Only a GOT and PLT are needed.
|
|
*/
|
|
md_swapout_got(rrs_got, number_of_gotslots);
|
|
mywrite(rrs_got, number_of_gotslots, sizeof(got_t), outstream);
|
|
|
|
md_swapout_jmpslot(rrs_plt, number_of_jmpslots);
|
|
mywrite(rrs_plt, number_of_jmpslots,
|
|
sizeof(jmpslot_t), outstream);
|
|
|
|
return;
|
|
}
|
|
|
|
md_swapout__dynamic(&rrs_dyn);
|
|
mywrite(&rrs_dyn, 1, sizeof(struct _dynamic), outstream);
|
|
|
|
md_swapout_so_debug(&rrs_so_debug);
|
|
mywrite(&rrs_so_debug, 1, sizeof(struct so_debug), outstream);
|
|
|
|
md_swapout_section_dispatch_table(&rrs_sdt);
|
|
mywrite(&rrs_sdt, 1, sizeof(struct section_dispatch_table), outstream);
|
|
|
|
md_swapout_got(rrs_got, number_of_gotslots);
|
|
mywrite(rrs_got, number_of_gotslots, sizeof(got_t), outstream);
|
|
|
|
md_swapout_jmpslot(rrs_plt, number_of_jmpslots);
|
|
mywrite(rrs_plt, number_of_jmpslots, sizeof(jmpslot_t), outstream);
|
|
}
|
|
|
|
void
|
|
write_rrs_text()
|
|
{
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|
long pos;
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int i;
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|
int symsize;
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|
struct nzlist *nlp;
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|
int offset = 0;
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|
int aligned_offset;
|
|
struct shobj *shp;
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|
struct sod *sodp;
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int bind;
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|
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if (rrs_section_type == RRS_PARTIAL)
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return;
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|
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|
pos = rrs_text_start + N_TXTOFF(outheader) - text_start;
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if (fseek(outstream, pos, SEEK_SET) != 0)
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err(1, "write_rrs_text: fseek");
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|
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/* Write relocation records */
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md_swapout_reloc(rrs_reloc, reserved_rrs_relocs);
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mywrite(rrs_reloc, reserved_rrs_relocs,
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sizeof(struct relocation_info), outstream);
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|
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/* Write the RRS symbol hash tables */
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md_swapout_rrs_hash(rrs_hashtab, number_of_rrs_hash_entries);
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mywrite(rrs_hashtab, number_of_rrs_hash_entries,
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sizeof(struct rrs_hash), outstream);
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|
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/*
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* Determine size of an RRS symbol entry, allocate space
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* to collect them in.
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*/
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symsize = number_of_rrs_symbols * rrs_symbol_size;
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nlp = rrs_symbols = (struct nzlist *)alloca(symsize);
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rrs_strtab = (char *)alloca(rrs_strtab_size);
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#define INCR_NLP(p) ((p) = (struct nzlist *)((long)(p) + rrs_symbol_size))
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/* __DYNAMIC symbol *must* be first for Sun compatibility */
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nlp->nz_desc = nlp->nz_other = 0;
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if (LD_VERSION_NZLIST_P(soversion))
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nlp->nz_size = 0;
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nlp->nz_type = dynamic_symbol->defined;
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nlp->nz_value = dynamic_symbol->value;
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nlp->nz_value = dynamic_symbol->value;
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nlp->nz_strx = offset;
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strcpy(rrs_strtab + offset, dynamic_symbol->name);
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offset += 1 + strlen(dynamic_symbol->name);
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INCR_NLP(nlp);
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/*
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* Now, for each global symbol, construct a nzlist element
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* for inclusion in the RRS symbol table.
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*/
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FOR_EACH_SYMBOL(i, sp) {
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if (sp == dynamic_symbol)
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continue;
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if ((link_mode & SHAREABLE) && sp->warning) {
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/*
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* Write a N_WARNING duo.
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*/
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nlp->nz_type = N_WARNING;
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nlp->nz_un.n_strx = offset;
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nlp->nz_value = 0;
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nlp->nz_other = 0;
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nlp->nz_desc = 0;
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nlp->nz_size = 0;
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strcpy(rrs_strtab + offset, sp->warning);
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offset += 1 + strlen(sp->warning);
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INCR_NLP(nlp);
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nlp->nz_type = N_UNDF + N_EXT;
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nlp->nz_un.n_strx = offset;
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nlp->nz_value = 0;
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nlp->nz_other = 0;
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nlp->nz_desc = 0;
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nlp->nz_size = 0;
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strcpy(rrs_strtab + offset, sp->name);
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offset += 1 + strlen(sp->name);
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INCR_NLP(nlp);
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}
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if (!(sp->flags & GS_REFERENCED))
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continue;
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|
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if ((long)nlp - (long)rrs_symbols >=
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number_of_rrs_symbols * rrs_symbol_size)
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errx(1, "internal error: "
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"rrs symbols exceed allocation %d",
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number_of_rrs_symbols);
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|
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nlp->nz_desc = 0;
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|
nlp->nz_other = 0;
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if (LD_VERSION_NZLIST_P(soversion))
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nlp->nz_size = 0;
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|
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bind = (sp->flags & GS_WEAK) ? BIND_WEAK : 0;
|
|
|
|
if (sp->defined > 1) {
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|
/* defined with known type */
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|
if (!(link_mode & SHAREABLE) &&
|
|
sp->alias && sp->alias->defined > 1) {
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|
/*
|
|
* If the target of an indirect symbol has
|
|
* been defined and we are outputting an
|
|
* executable, resolve the indirection; it's
|
|
* no longer needed.
|
|
*/
|
|
nlp->nz_type = sp->alias->defined;
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nlp->nz_value = sp->alias->value;
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nlp->nz_other = N_OTHER(bind, sp->alias->aux);
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} else if (sp->defined == N_SIZE) {
|
|
/*
|
|
* Make sure this symbol isn't going
|
|
* to define anything.
|
|
*/
|
|
nlp->nz_type = N_UNDF;
|
|
nlp->nz_value = 0;
|
|
} else {
|
|
nlp->nz_type = sp->defined;
|
|
nlp->nz_value = sp->value;
|
|
nlp->nz_other = N_OTHER(bind, sp->aux);
|
|
}
|
|
if (LD_VERSION_NZLIST_P(soversion))
|
|
nlp->nz_size = sp->size;
|
|
} else if (sp->common_size) {
|
|
/*
|
|
* A common definition.
|
|
*/
|
|
nlp->nz_type = N_UNDF | N_EXT;
|
|
nlp->nz_value = sp->common_size;
|
|
nlp->nz_other = N_OTHER(bind, 0);
|
|
} else if (!sp->defined) {
|
|
/* undefined */
|
|
nlp->nz_type = N_UNDF | N_EXT;
|
|
nlp->nz_value = 0;
|
|
if (sp->so_defined && sp->jmpslot_offset != -1) {
|
|
/*
|
|
* A PLT entry. The auxiliary type -- which
|
|
* must be AUX_FUNC -- is used by the run-time
|
|
* linker to unambiguously resolve function
|
|
* address references.
|
|
*/
|
|
if (sp->aux != AUX_FUNC)
|
|
errx(1, "%s: non-function jmpslot",
|
|
demangle(sp->name));
|
|
nlp->nz_other = N_OTHER(bind, sp->aux);
|
|
nlp->nz_value =
|
|
rrs_sdt.sdt_plt + sp->jmpslot_offset;
|
|
}
|
|
} else
|
|
errx(1, "internal error: %s defined in mysterious way",
|
|
demangle(sp->name));
|
|
|
|
/* Set symbol's name */
|
|
nlp->nz_strx = offset;
|
|
strcpy(rrs_strtab + offset, sp->name);
|
|
offset += 1 + strlen(sp->name);
|
|
|
|
if (sp->alias) {
|
|
/*
|
|
* Write an extra symbol for indirections (possibly
|
|
* just a dummy).
|
|
*/
|
|
int t = (nlp->nz_type == N_INDR + N_EXT);
|
|
|
|
INCR_NLP(nlp);
|
|
nlp->nz_type = N_UNDF + (t ? N_EXT : 0);
|
|
nlp->nz_un.n_strx = offset;
|
|
nlp->nz_value = 0;
|
|
nlp->nz_other = 0;
|
|
nlp->nz_desc = 0;
|
|
nlp->nz_size = 0;
|
|
strcpy(rrs_strtab + offset, sp->alias->name);
|
|
offset += 1 + strlen(sp->alias->name);
|
|
}
|
|
|
|
INCR_NLP(nlp);
|
|
|
|
} END_EACH_SYMBOL;
|
|
|
|
aligned_offset = MALIGN(offset);
|
|
while (offset < aligned_offset) /* Pad deterministically */
|
|
rrs_strtab[offset++] = '\0';
|
|
if (offset != rrs_strtab_size)
|
|
errx(1, "internal error: "
|
|
"inconsistent RRS string table length: %d, expected %d",
|
|
offset, rrs_strtab_size);
|
|
|
|
/* Write the symbol table */
|
|
if (rrs_symbol_size == sizeof(struct nlist))
|
|
md_swapout_symbols(rrs_symbols, number_of_rrs_symbols);
|
|
else
|
|
md_swapout_zsymbols(rrs_symbols, number_of_rrs_symbols);
|
|
mywrite(rrs_symbols, symsize, 1, outstream);
|
|
|
|
/* Write the strings */
|
|
mywrite(rrs_strtab, rrs_strtab_size, 1, outstream);
|
|
|
|
/* Write RT search path */
|
|
mywrite(rrs_search_paths, rrs_search_paths_size, 1, outstream);
|
|
|
|
/*
|
|
* Write the names of the shared objects needed at run-time
|
|
*/
|
|
pos = rrs_sdt.sdt_sods + number_of_shobjs * sizeof(struct sod);
|
|
sodp = (struct sod *)alloca( number_of_shobjs * sizeof(struct sod));
|
|
|
|
for (i = 0, shp = rrs_shobjs; shp; i++, shp = shp->next) {
|
|
char *name = shp->entry->local_sym_name;
|
|
|
|
if (i >= number_of_shobjs)
|
|
errx(1, "internal error: # of link objects exceeds %d",
|
|
number_of_shobjs);
|
|
|
|
sodp[i].sod_name = pos;
|
|
sodp[i].sod_major = shp->entry->lib_major;
|
|
sodp[i].sod_minor = shp->entry->lib_minor;
|
|
|
|
if (*name == '-' && *(name+1) == 'l') {
|
|
name += 2;
|
|
sodp[i].sod_library = 1;
|
|
} else
|
|
sodp[i].sod_library = 0;
|
|
sodp[i].sod_reserved = 0;
|
|
|
|
pos += 1 + strlen(name);
|
|
sodp[i].sod_next = (i == number_of_shobjs - 1) ? 0 :
|
|
(rrs_sdt.sdt_sods + (i+1)*sizeof(struct sod));
|
|
}
|
|
|
|
if (i < number_of_shobjs)
|
|
errx(1, "internal error: "
|
|
"# of link objects less then expected %d",
|
|
number_of_shobjs);
|
|
|
|
md_swapout_sod(sodp, number_of_shobjs);
|
|
mywrite(sodp, number_of_shobjs, sizeof(struct sod), outstream);
|
|
|
|
for (i = 0, shp = rrs_shobjs; shp; i++, shp = shp->next) {
|
|
char *name = shp->entry->local_sym_name;
|
|
|
|
if (*name == '-' && *(name+1) == 'l') {
|
|
name += 2;
|
|
}
|
|
|
|
mywrite(name, strlen(name) + 1, 1, outstream);
|
|
}
|
|
}
|
|
|
|
void
|
|
write_rrs()
|
|
{
|
|
|
|
/*
|
|
* First, do some consistency checks on the RRS segment.
|
|
*/
|
|
if (rrs_section_type == RRS_NONE) {
|
|
if (reserved_rrs_relocs > 1)
|
|
errx(1, "internal error: "
|
|
"RRS relocs in static program: %d",
|
|
reserved_rrs_relocs-1);
|
|
return;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
printf("rrs_relocs: reserved %d claimed %d discarded %d, gotslots %d jmpslots %d\n",
|
|
reserved_rrs_relocs, claimed_rrs_relocs, discarded_rrs_relocs,
|
|
number_of_gotslots-1, number_of_jmpslots-1);
|
|
#endif
|
|
|
|
/* Final consistency check */
|
|
if (claimed_rrs_relocs + discarded_rrs_relocs != reserved_rrs_relocs) {
|
|
errx(1, "internal error: "
|
|
"reserved relocs(%d) != claimed(%d) + discarded(%d)",
|
|
reserved_rrs_relocs,
|
|
claimed_rrs_relocs,
|
|
discarded_rrs_relocs);
|
|
}
|
|
|
|
/* Write the RRS segments. */
|
|
write_rrs_text ();
|
|
write_rrs_data ();
|
|
}
|