[Elftoolchain-developers] arch specific sections

[Peng F. <van...@gm...>]

Hi,
I am trying to use elftoolchain to handle arm elf object files.
But I always get error when handling ".ARM.attributes, .ARM.exidx ,
.ARM.extab " sections.

I traced the source code and found that it fails at elf_data.c line 93.
The following is a piece of code.

if ((elftype = _libelf_xlate_shtype(sh_type)) < ELF_T_FIRST ||
    elftype > ELF_T_LAST || (sh_type != SHT_NOBITS &&
    sh_offset + sh_size > (uint64_t) e->e_rawsize)) {
LIBELF_SET_ERROR(SECTION, 0);
return (NULL);
}
The .ARM.* sections are specific to ARM and the _libelf_xlate_shtype
function does not handle such
arch specific sections.

I have a question about how to add support for arch specific sections, not
only to arm, but also other archs.

I added the following code before invoke  _libelf_xlate_shtype  to handle
arm specific sections, but I am not
 sure whether this is the right way.

*  if (s->s_elf->e_u.e_elf.e_ehdr.e_ehdr32->e_machine == EM_ARM) {*
*    if ((sh_type == 0x70000003) || (sh_type == 0x70000001)) {*
*      if ((d = _libelf_allocate_data(s)) == NULL) *
*        return (NULL);*
*      d->d_buf = 0;*
*      d->d_size = 0;*
*      return (d);*
*    }*
*  }*
   if ((elftype = _libelf_xlate_shtype(sh_type)) < ELF_T_FIRST ||

Thanks very much.

Regards,
Peng