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/*
opt.delscn.c - implementation of the elf_delscn(3) function.
Copyright (C) 1995 - 2001 Michael Riepe
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <private.h>
#ifndef lint
static const char rcsid[] = "@(#) $Id: opt.delscn.c,v 1.12 2008/05/23 08:15:35 michael Exp $";
#endif /* lint */
static size_t
_newindex(size_t old, size_t index) {
return old == index ? SHN_UNDEF : (old > index ? old - 1 : old);
}
static void
_elf32_update_shdr(Elf *elf, size_t index) {
Elf32_Shdr *shdr;
Elf_Scn *scn;
((Elf32_Ehdr*)elf->e_ehdr)->e_shnum = elf->e_scn_n->s_index + 1;
for (scn = elf->e_scn_1; scn; scn = scn->s_link) {
shdr = &scn->s_shdr32;
switch (shdr->sh_type) {
case SHT_REL:
case SHT_RELA:
shdr->sh_info = _newindex(shdr->sh_info, index);
/* fall through */
case SHT_DYNSYM:
case SHT_DYNAMIC:
case SHT_HASH:
case SHT_SYMTAB:
#if __LIBELF_SYMBOL_VERSIONS
#if __LIBELF_SUN_SYMBOL_VERSIONS
case SHT_SUNW_verdef:
case SHT_SUNW_verneed:
case SHT_SUNW_versym:
#else /* __LIBELF_SUN_SYMBOL_VERSIONS */
case SHT_GNU_verdef:
case SHT_GNU_verneed:
case SHT_GNU_versym:
#endif /* __LIBELF_SUN_SYMBOL_VERSIONS */
#endif /* __LIBELF_SYMBOL_VERSIONS */
shdr->sh_link = _newindex(shdr->sh_link, index);
/* fall through */
default:
break;
}
}
}
#if __LIBELF64
static void
_elf64_update_shdr(Elf *elf, size_t index) {
Elf64_Shdr *shdr;
Elf_Scn *scn;
((Elf64_Ehdr*)elf->e_ehdr)->e_shnum = elf->e_scn_n->s_index + 1;
for (scn = elf->e_scn_1; scn; scn = scn->s_link) {
shdr = &scn->s_shdr64;
switch (shdr->sh_type) {
case SHT_REL:
case SHT_RELA:
shdr->sh_info = _newindex(shdr->sh_info, index);
/* fall through */
case SHT_DYNSYM:
case SHT_DYNAMIC:
case SHT_HASH:
case SHT_SYMTAB:
#if __LIBELF_SYMBOL_VERSIONS
#if __LIBELF_SUN_SYMBOL_VERSIONS
case SHT_SUNW_verdef:
case SHT_SUNW_verneed:
case SHT_SUNW_versym:
#else /* __LIBELF_SUN_SYMBOL_VERSIONS */
case SHT_GNU_verdef:
case SHT_GNU_verneed:
case SHT_GNU_versym:
#endif /* __LIBELF_SUN_SYMBOL_VERSIONS */
#endif /* __LIBELF_SYMBOL_VERSIONS */
shdr->sh_link = _newindex(shdr->sh_link, index);
/* fall through */
default:
break;
}
}
}
#endif /* __LIBELF64 */
size_t
elf_delscn(Elf *elf, Elf_Scn *scn) {
Elf_Scn *pscn;
Scn_Data *sd;
Scn_Data *tmp;
size_t index;
if (!elf || !scn) {
return SHN_UNDEF;
}
elf_assert(elf->e_magic == ELF_MAGIC);
elf_assert(scn->s_magic == SCN_MAGIC);
elf_assert(elf->e_ehdr);
if (scn->s_elf != elf) {
seterr(ERROR_ELFSCNMISMATCH);
return SHN_UNDEF;
}
elf_assert(elf->e_scn_1);
if (scn == elf->e_scn_1) {
seterr(ERROR_NULLSCN);
return SHN_UNDEF;
}
/*
* Find previous section.
*/
for (pscn = elf->e_scn_1; pscn->s_link; pscn = pscn->s_link) {
if (pscn->s_link == scn) {
break;
}
}
if (pscn->s_link != scn) {
seterr(ERROR_ELFSCNMISMATCH);
return SHN_UNDEF;
}
/*
* Unlink section.
*/
if (elf->e_scn_n == scn) {
elf->e_scn_n = pscn;
}
pscn->s_link = scn->s_link;
index = scn->s_index;
/*
* Free section descriptor and data.
*/
for (sd = scn->s_data_1; sd; sd = tmp) {
elf_assert(sd->sd_magic == DATA_MAGIC);
elf_assert(sd->sd_scn == scn);
tmp = sd->sd_link;
if (sd->sd_free_data && sd->sd_memdata) {
free(sd->sd_memdata);
}
if (sd->sd_freeme) {
free(sd);
}
}
if ((sd = scn->s_rawdata)) {
elf_assert(sd->sd_magic == DATA_MAGIC);
elf_assert(sd->sd_scn == scn);
if (sd->sd_free_data && sd->sd_memdata) {
free(sd->sd_memdata);
}
if (sd->sd_freeme) {
free(sd);
}
}
if (scn->s_freeme) {
elf_assert(scn->s_index > 0);
free(scn);
}
/*
* Adjust section indices.
*/
for (scn = pscn->s_link; scn; scn = scn->s_link) {
elf_assert(scn->s_index > index);
scn->s_index--;
}
/*
* Adjust ELF header and well-known section headers.
*/
if (elf->e_class == ELFCLASS32) {
_elf32_update_shdr(elf, index);
return index;
}
#if __LIBELF64
else if (elf->e_class == ELFCLASS64) {
_elf64_update_shdr(elf, index);
return index;
}
#endif /* __LIBELF64 */
else if (valid_class(elf->e_class)) {
seterr(ERROR_UNIMPLEMENTED);
}
else {
seterr(ERROR_UNKNOWN_CLASS);
}
return SHN_UNDEF;
}
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