Bug 2411 - ELF linker fails to create executable with more than 64k sections
Summary: ELF linker fails to create executable with more than 64k sections
Status: RESOLVED FIXED
Alias: None
Product: binutils
Classification: Unclassified
Component: ld (show other bugs)
Version: unspecified
: P2 normal
Target Milestone: ---
Assignee: unassigned
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2006-03-02 20:39 UTC by H.J. Lu
Modified: 2006-04-05 18:15 UTC (History)
1 user (show)

See Also:
Host:
Target:
Build:
Last reconfirmed:

Attachments
A testcase (25.71 KB, application/octet-stream)
2006-03-02 20:40 UTC, H.J. Lu 		Details
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.
Description H.J. Lu 2006-03-02 20:39:08 UTC 
ELF linker has lines like

bed->s->swap_symbol_out (abfd, &sym, dest, 0);

It doesn't work when creating DSO with 64k sections due to

elf_swap_symbol_out (bfd *abfd,
                     const Elf_Internal_Sym *src,
                     void *cdst,
                     void *shndx)
{
  unsigned int tmp;
  Elf_External_Sym *dst = cdst;
  H_PUT_32 (abfd, src->st_name, dst->st_name);
  H_PUT_WORD (abfd, src->st_value, dst->st_value);
  H_PUT_WORD (abfd, src->st_size, dst->st_size);
  H_PUT_8 (abfd, src->st_info, dst->st_info);
  H_PUT_8 (abfd, src->st_other, dst->st_other);
  tmp = src->st_shndx;
  if (tmp > SHN_HIRESERVE)
    {
      if (shndx == NULL)
        abort ();
      H_PUT_32 (abfd, tmp, shndx);
      tmp = SHN_XINDEX;
    }
  H_PUT_16 (abfd, tmp, dst->st_shndx);
}
Comment 1 H.J. Lu 2006-03-02 20:40:03 UTC 
Created attachment 898 [details]
A testcase

gcc -fPIC   -c -o sect.o sect.c
gcc -shared -o libsect.so sect.o
/usr/local/bin/ld: BFD 2.16.91.0.7 20060228 internal error, aborting at
/net/gnu-13/export/linux/src/binutils/binutils/bfd/elfcode.h line 215 in
bfd_elf64_swap_symbol_out

/usr/local/bin/ld: Please report this bug.

collect2: ld returned 1 exit status
Comment 2 H.J. Lu 2006-03-02 22:08:00 UTC 
The gABI doesn't support dynamic symbols in more than 64k sections. I am
not sure if there is anything we can do.
Comment 3 H.J. Lu 2006-03-02 22:48:55 UTC 
I guess the 64k section support is incomplete. If there are more than 64k
sections, entries in the dynamic symbol table may reference sections beyond
64k:

gcc -B./ -o bar sect.o bar.o
/usr/local/bin/ld: BFD 2.16.91.0.7 20060228 internal error, aborting at
/net/gnu-13/export/linux/src/binutils/binutils/bfd/elfcode.h line 215 in
bfd_elf64_swap_symbol_out

/usr/local/bin/ld: Please report this bug.

collect2: ld returned 1 exit status

I guess linker should stop well before getting abort.
Comment 4 H.J. Lu 2006-04-05 18:15:14 UTC 
Fixed with

http://sourceware.org/ml/binutils/2006-03/msg00055.html