1
0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-20 11:11:24 +00:00
Commit Graph

7 Commits

Author SHA1 Message Date
John Polstra
0aca4b60dc On the i386, load the ELF dynamic linker where an mmap(0, ...) would
put it, just like on the Alpha.  It was wrong to load it at the
fixed address 0x08000000.  That should only be done if the dynamic
linker is an executable (not a shared object) with a specific load
address encoded in the object file itself.

This fixes the recent breakage in the Linux emulator.
1999-02-19 01:30:43 +00:00
John Polstra
47633640aa Change the load address of the ELF dynamic linker from "2L*MAXDSIZ"
to an architecture-specific value defined in <machine/elf.h>.  This
solves problems on large-memory systems that have a high value for
MAXDSIZ.

The load address is controlled by a new macro ELF_RTLD_ADDR(vmspace).
On the i386 it is hard-wired to 0x08000000, which is the standard
SVR4 location for the dynamic linker.

On the Alpha, the dynamic linker is loaded MAXDSIZ bytes beyond
the start of the program's data segment.  This is the same place
a userland mmap(0, ...) call would put it, so it ends up just below
all the shared libraries.  The rationale behind the calculation is
that it allows room for the data segment to grow to its maximum
possible size.

These changes have been tested on the i386 for several months
without problems.  They have been tested on the Alpha as well,
though not for nearly as long.  I would like to merge the changes
into 3.1 within a week if no problems have surfaced as a result of
them.
1999-02-07 23:49:56 +00:00
Peter Wemm
034db87204 Add an ELF_MACHINE_OK() macro for compatability with the Alpha version. 1998-10-18 15:31:23 +00:00
John Polstra
c8afdc1dcf Add generic defines ELF_ARCH, ELF_CLASS, and ELF_DATA. These give
the relevant characteristics of the native machine, for building
and checking Elf_Ehdr structures.

Add structures to represent ELF "note" headers.  Add defines for the
note types used in ELF core files.
1998-09-14 20:30:13 +00:00
John Polstra
ca0154bc75 Revamp the ELF include files to better support architecture-independent
applications.  Here's how it works.

The kernel should include <machine/elf.h> to get the definitions
for the native architecture.  It can reference the various ELF
structures with generic names like Elf_Sym, Elf_Shdr, etc.  A define
__ELF_WORD_SIZE is also available with the value 32 or 64 as
appropriate for the native architecture.

Generic applications should include <elf.h>, which is just a wrapper
for <machine/elf.h>.

Applications such as object file dumpers that need to deal with
foreign ELF files can include <sys/elf32.h> and/or <sys/elf64.h>.
Both can be included from the same source file if desired.  The
structure names must be referenced using wordsize-specific names
like Elf32_Sym, Elf64_Shdr, etc.

I haven't change the alpha stuff, but I haven't broken it either.
1998-08-16 03:03:38 +00:00
Peter Wemm
bf9380893a Define some machine characteristics using symbol naming on conventions
in place in the other BSD's.
1997-08-30 18:59:48 +00:00
John Polstra
5851a3655a Fill out the ELF header files to make them more or less complete.
Fix a macro name that was misspelled both in brandelf.c and
imgact_elf.h.
1997-05-21 23:07:31 +00:00