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Add support for Visual Studio 2019
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Marius Greuel
205
external/libelf/src/opt.delscn.c
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205
external/libelf/src/opt.delscn.c
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/*
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opt.delscn.c - implementation of the elf_delscn(3) function.
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Copyright (C) 1995 - 2001 Michael Riepe
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <private.h>
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#ifndef lint
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static const char rcsid[] = "@(#) $Id: opt.delscn.c,v 1.12 2008/05/23 08:15:35 michael Exp $";
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#endif /* lint */
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static size_t
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_newindex(size_t old, size_t index) {
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return old == index ? SHN_UNDEF : (old > index ? old - 1 : old);
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}
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static void
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_elf32_update_shdr(Elf *elf, size_t index) {
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Elf32_Shdr *shdr;
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Elf_Scn *scn;
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((Elf32_Ehdr*)elf->e_ehdr)->e_shnum = elf->e_scn_n->s_index + 1;
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for (scn = elf->e_scn_1; scn; scn = scn->s_link) {
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shdr = &scn->s_shdr32;
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switch (shdr->sh_type) {
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case SHT_REL:
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case SHT_RELA:
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shdr->sh_info = _newindex(shdr->sh_info, index);
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/* fall through */
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case SHT_DYNSYM:
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case SHT_DYNAMIC:
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case SHT_HASH:
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case SHT_SYMTAB:
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#if __LIBELF_SYMBOL_VERSIONS
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#if __LIBELF_SUN_SYMBOL_VERSIONS
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case SHT_SUNW_verdef:
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case SHT_SUNW_verneed:
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case SHT_SUNW_versym:
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#else /* __LIBELF_SUN_SYMBOL_VERSIONS */
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case SHT_GNU_verdef:
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case SHT_GNU_verneed:
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case SHT_GNU_versym:
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#endif /* __LIBELF_SUN_SYMBOL_VERSIONS */
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#endif /* __LIBELF_SYMBOL_VERSIONS */
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shdr->sh_link = _newindex(shdr->sh_link, index);
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/* fall through */
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default:
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break;
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}
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}
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}
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#if __LIBELF64
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static void
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_elf64_update_shdr(Elf *elf, size_t index) {
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Elf64_Shdr *shdr;
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Elf_Scn *scn;
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((Elf64_Ehdr*)elf->e_ehdr)->e_shnum = elf->e_scn_n->s_index + 1;
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for (scn = elf->e_scn_1; scn; scn = scn->s_link) {
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shdr = &scn->s_shdr64;
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switch (shdr->sh_type) {
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case SHT_REL:
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case SHT_RELA:
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shdr->sh_info = _newindex(shdr->sh_info, index);
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/* fall through */
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case SHT_DYNSYM:
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case SHT_DYNAMIC:
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case SHT_HASH:
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case SHT_SYMTAB:
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#if __LIBELF_SYMBOL_VERSIONS
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#if __LIBELF_SUN_SYMBOL_VERSIONS
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case SHT_SUNW_verdef:
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case SHT_SUNW_verneed:
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case SHT_SUNW_versym:
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#else /* __LIBELF_SUN_SYMBOL_VERSIONS */
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case SHT_GNU_verdef:
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case SHT_GNU_verneed:
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case SHT_GNU_versym:
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#endif /* __LIBELF_SUN_SYMBOL_VERSIONS */
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#endif /* __LIBELF_SYMBOL_VERSIONS */
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shdr->sh_link = _newindex(shdr->sh_link, index);
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/* fall through */
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default:
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break;
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}
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}
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}
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#endif /* __LIBELF64 */
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size_t
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elf_delscn(Elf *elf, Elf_Scn *scn) {
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Elf_Scn *pscn;
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Scn_Data *sd;
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Scn_Data *tmp;
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size_t index;
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if (!elf || !scn) {
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return SHN_UNDEF;
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}
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elf_assert(elf->e_magic == ELF_MAGIC);
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elf_assert(scn->s_magic == SCN_MAGIC);
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elf_assert(elf->e_ehdr);
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if (scn->s_elf != elf) {
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seterr(ERROR_ELFSCNMISMATCH);
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return SHN_UNDEF;
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}
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elf_assert(elf->e_scn_1);
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if (scn == elf->e_scn_1) {
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seterr(ERROR_NULLSCN);
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return SHN_UNDEF;
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}
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/*
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* Find previous section.
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*/
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for (pscn = elf->e_scn_1; pscn->s_link; pscn = pscn->s_link) {
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if (pscn->s_link == scn) {
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break;
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}
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}
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if (pscn->s_link != scn) {
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seterr(ERROR_ELFSCNMISMATCH);
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return SHN_UNDEF;
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}
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/*
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* Unlink section.
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*/
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if (elf->e_scn_n == scn) {
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elf->e_scn_n = pscn;
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}
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pscn->s_link = scn->s_link;
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index = scn->s_index;
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/*
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* Free section descriptor and data.
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*/
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for (sd = scn->s_data_1; sd; sd = tmp) {
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elf_assert(sd->sd_magic == DATA_MAGIC);
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elf_assert(sd->sd_scn == scn);
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tmp = sd->sd_link;
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if (sd->sd_free_data && sd->sd_memdata) {
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free(sd->sd_memdata);
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}
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if (sd->sd_freeme) {
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free(sd);
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}
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}
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if ((sd = scn->s_rawdata)) {
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elf_assert(sd->sd_magic == DATA_MAGIC);
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elf_assert(sd->sd_scn == scn);
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if (sd->sd_free_data && sd->sd_memdata) {
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free(sd->sd_memdata);
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}
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if (sd->sd_freeme) {
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free(sd);
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}
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}
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if (scn->s_freeme) {
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elf_assert(scn->s_index > 0);
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free(scn);
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}
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/*
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* Adjust section indices.
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*/
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for (scn = pscn->s_link; scn; scn = scn->s_link) {
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elf_assert(scn->s_index > index);
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scn->s_index--;
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}
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/*
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* Adjust ELF header and well-known section headers.
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*/
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if (elf->e_class == ELFCLASS32) {
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_elf32_update_shdr(elf, index);
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return index;
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}
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#if __LIBELF64
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else if (elf->e_class == ELFCLASS64) {
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_elf64_update_shdr(elf, index);
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return index;
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}
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#endif /* __LIBELF64 */
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else if (valid_class(elf->e_class)) {
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seterr(ERROR_UNIMPLEMENTED);
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}
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else {
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seterr(ERROR_UNKNOWN_CLASS);
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}
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return SHN_UNDEF;
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}
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