On Wed, 2015-08-05 at 17:55 +0200, Kai Wasserbäch wrote:
> So, if I've understood you correctly, you want an ELF dump of a Mesa build
> linked against libelfg0 and one linked against libelf1. You can find the
> generated files in the attached Tar archive. Please note, that the run with
> libelf1 only produced two dumps before segfaulting.
That seems to confirm that the generation is the same (at least for the
first two files). I was hoping to find a difference between parsing some
of these files with an old/new libelf. So I wrote a little program that
is just the parsing as radeon_elf_read () does. But found no difference.
Maybe I am not testing against the right versions though (they are my
local builds).
Could you compile the following with:
gcc -g -lelf -o elfrel elfrel.c
and then run it against all these ELF files with the bad libelf like
for i in 794488_elfs/libelf*/dump.elf.*; do ./elfrel $i; done
For me the output looks like:
file: 794488_elfs/libelf1/dump.elf.EL5kJT
Nothing found
file: 794488_elfs/libelf1/dump.elf.J4EnbO
symbols: 5
1: not global or undefined
2: not global or undefined
3: not global or undefined
4: not global or undefined
5: 0
relocations: 2
0: 10, SCRATCH_RSRC_DWORD1
1: 2c, SCRATCH_RSRC_DWORD0
file: 794488_elfs/libelfg0/dump.elf.7NnBvc
Nothing found
file: 794488_elfs/libelfg0/dump.elf.ahPsJJ
symbols: 5
1: not global or undefined
2: not global or undefined
3: not global or undefined
4: not global or undefined
5: 0
relocations: 2
0: 10, SCRATCH_RSRC_DWORD1
1: 2c, SCRATCH_RSRC_DWORD0
file: 794488_elfs/libelfg0/dump.elf.DYTjdO
Nothing found
file: 794488_elfs/libelfg0/dump.elf.Lke6Xg
Nothing found
Hopefully for you the output looks different with the bad (or good)
libelf. Then I need to make sure I have the right bad/good version
myself. Otherwise I need to dig a bit deeper to understand what is going
wrong.
Thanks,
Mark
$ cat elfrel.c
#include <gelf.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int
main (int argc, char **argv)
{
elf_version(EV_CURRENT);
printf ("file: %s\n", argv[1]);
int fd = open (argv[1], O_RDONLY);
Elf *elf = elf_begin (fd, ELF_C_READ, NULL);
size_t section_str_index;
elf_getshdrstrndx(elf, §ion_str_index);
size_t reloc_count, symbol_sh_link, symbol_count;
Elf_Data *relocs, *symbols;
{
const char *name;
GElf_Shdr section_header;
if (gelf_getshdr(section, §ion_header) != §ion_header)
{
fprintf(stderr, "Failed to read ELF section header\n");
return -1;
}
name = elf_strptr(elf, section_str_index, section_header.sh_name);
if (strncmp(name, ".symtab", 7) == 0)
{
symbols = elf_getdata(section, NULL);
symbol_sh_link = section_header.sh_link;
symbol_count = section_header.sh_size / section_header.sh_entsize;
}
else if (strcmp (name, ".rel.text") == 0)
{
relocs = elf_getdata(section, NULL);
reloc_count = section_header.sh_size / section_header.sh_entsize;
}
}
if (!relocs || !symbols || !reloc_count)
{
printf("Nothing found\n");
return -1;
}
printf ("symbols: %zd\n", symbol_count);
GElf_Sym symbol;
size_t i = 0;
while (gelf_getsym (symbols, i++, &symbol))
{
if (GELF_ST_BIND(symbol.st_info) != STB_GLOBAL
|| symbol.st_shndx == 0)
{
printf ("%zd: not global or undefined\n", i);
continue;
}
printf ("%zd: %" PRIx64 "\n", i, symbol.st_value);
}
printf ("relocations: %zd\n", reloc_count);
for (size_t i = 0; i < reloc_count; i++)
{
GElf_Sym symbol;
GElf_Rel rel;
char *symbol_name;
gelf_getrel(relocs, i, &rel);
gelf_getsym(symbols, GELF_R_SYM(rel.r_info), &symbol);
symbol_name = elf_strptr(elf, symbol_sh_link, symbol.st_name);
printf ("%zd: %" PRIx64 ", %s\n", i, rel.r_offset, symbol_name);
}
return 0;
}
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