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modpost: Update 64k section support for binutils 2.18.50

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Binutils 2.18.50 made a backwards-incompatible change in the way it
writes ELF objects with over 65280 sections, to improve conformance
with the ELF specification and interoperability with other ELF tools.
Specifically, it no longer adds 256 to section indices SHN_LORESERVE
and higher to skip over the reserved range SHN_LORESERVE through
SHN_HIRESERVE; those values are only considered special in the
st_shndx field, and not in other places where section indices are
stored.  See:

http://sourceware.org/bugzilla/show_bug.cgi?id=5900
http://groups.google.com/group/generic-abi/browse_thread/thread/e8bb63714b072e67/6c63738f12cc8a17

Signed-off-by: Anders Kaseorg <andersk@ksplice.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Anders Kaseorg
2011-05-19 16:55:27 -06:00
committed by Rusty Russell
parent 9d63487f86
commit 6845756b29
2 changed files with 14 additions and 29 deletions
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16
scripts/mod/modpost.c
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@@ -420,11 +420,10 @@ static int parse_elf(struct elf_info *info, const char *filename)
return 0;
}
if (hdr->e_shnum == 0) {
if (hdr->e_shnum == SHN_UNDEF) {
/*
* There are more than 64k sections,
* read count from .sh_size.
* note: it doesn't need shndx2secindex()
*/
info->num_sections = TO_NATIVE(sechdrs[0].sh_size);
}
@@ -432,8 +431,7 @@ static int parse_elf(struct elf_info *info, const char *filename)
info->num_sections = hdr->e_shnum;
}
if (hdr->e_shstrndx == SHN_XINDEX) {
info->secindex_strings =
shndx2secindex(TO_NATIVE(sechdrs[0].sh_link));
info->secindex_strings = TO_NATIVE(sechdrs[0].sh_link);
}
else {
info->secindex_strings = hdr->e_shstrndx;
@@ -489,7 +487,7 @@ static int parse_elf(struct elf_info *info, const char *filename)
sechdrs[i].sh_offset;
info->symtab_stop = (void *)hdr +
sechdrs[i].sh_offset + sechdrs[i].sh_size;
sh_link_idx = shndx2secindex(sechdrs[i].sh_link);
sh_link_idx = sechdrs[i].sh_link;
info->strtab = (void *)hdr +
sechdrs[sh_link_idx].sh_offset;
}
@@ -516,11 +514,9 @@ static int parse_elf(struct elf_info *info, const char *filename)
if (symtab_shndx_idx != ~0U) {
Elf32_Word *p;
if (symtab_idx !=
shndx2secindex(sechdrs[symtab_shndx_idx].sh_link))
if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
fatal("%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
filename,
shndx2secindex(sechdrs[symtab_shndx_idx].sh_link),
filename, sechdrs[symtab_shndx_idx].sh_link,
symtab_idx);
/* Fix endianness */
for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
@@ -1446,7 +1442,7 @@ static unsigned int *reloc_location(struct elf_info *elf,
Elf_Shdr *sechdr, Elf_Rela *r)
{
Elf_Shdr *sechdrs = elf->sechdrs;
int section = shndx2secindex(sechdr->sh_info);
int section = sechdr->sh_info;
return (void *)elf->hdr + sechdrs[section].sh_offset +
r->r_offset;