gelf_rela.c revision 4484
14484Sbinkertn@umich.edu/*- 24484Sbinkertn@umich.edu * Copyright (c) 2006 Joseph Koshy 34484Sbinkertn@umich.edu * All rights reserved. 44484Sbinkertn@umich.edu * 54484Sbinkertn@umich.edu * Redistribution and use in source and binary forms, with or without 64484Sbinkertn@umich.edu * modification, are permitted provided that the following conditions 74484Sbinkertn@umich.edu * are met: 84484Sbinkertn@umich.edu * 1. Redistributions of source code must retain the above copyright 94484Sbinkertn@umich.edu * notice, this list of conditions and the following disclaimer. 104484Sbinkertn@umich.edu * 2. Redistributions in binary form must reproduce the above copyright 114484Sbinkertn@umich.edu * notice, this list of conditions and the following disclaimer in the 124484Sbinkertn@umich.edu * documentation and/or other materials provided with the distribution. 134484Sbinkertn@umich.edu * 144484Sbinkertn@umich.edu * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 154484Sbinkertn@umich.edu * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 164484Sbinkertn@umich.edu * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 174484Sbinkertn@umich.edu * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 184484Sbinkertn@umich.edu * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 194484Sbinkertn@umich.edu * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 204484Sbinkertn@umich.edu * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 214484Sbinkertn@umich.edu * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 224484Sbinkertn@umich.edu * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 234484Sbinkertn@umich.edu * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 244484Sbinkertn@umich.edu * SUCH DAMAGE. 254484Sbinkertn@umich.edu */ 264484Sbinkertn@umich.edu 274484Sbinkertn@umich.edu#include <limits.h> 284484Sbinkertn@umich.edu 294484Sbinkertn@umich.edu#include <assert.h> 304484Sbinkertn@umich.edu#include "gelf.h" 314484Sbinkertn@umich.edu 324484Sbinkertn@umich.edu#include "_libelf.h" 334484Sbinkertn@umich.edu 344484Sbinkertn@umich.eduGElf_Rela * 354484Sbinkertn@umich.edugelf_getrela(Elf_Data *d, int ndx, GElf_Rela *dst) 364484Sbinkertn@umich.edu{ 374484Sbinkertn@umich.edu int ec; 384484Sbinkertn@umich.edu Elf *e; 394484Sbinkertn@umich.edu Elf_Scn *scn; 404484Sbinkertn@umich.edu Elf32_Rela *rela32; 414484Sbinkertn@umich.edu Elf64_Rela *rela64; 424484Sbinkertn@umich.edu size_t msz; 434484Sbinkertn@umich.edu uint32_t sh_type; 444484Sbinkertn@umich.edu 454484Sbinkertn@umich.edu if (d == NULL || ndx < 0 || dst == NULL || 464484Sbinkertn@umich.edu (scn = d->d_scn) == NULL || 474484Sbinkertn@umich.edu (e = scn->s_elf) == NULL) { 484484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 494484Sbinkertn@umich.edu return (NULL); 504484Sbinkertn@umich.edu } 514484Sbinkertn@umich.edu 524484Sbinkertn@umich.edu ec = e->e_class; 534484Sbinkertn@umich.edu assert(ec == ELFCLASS32 || ec == ELFCLASS64); 544484Sbinkertn@umich.edu 554484Sbinkertn@umich.edu if (ec == ELFCLASS32) 564484Sbinkertn@umich.edu sh_type = scn->s_shdr.s_shdr32.sh_type; 574484Sbinkertn@umich.edu else 584484Sbinkertn@umich.edu sh_type = scn->s_shdr.s_shdr64.sh_type; 594484Sbinkertn@umich.edu 604484Sbinkertn@umich.edu if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) { 614484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 624484Sbinkertn@umich.edu return (NULL); 634484Sbinkertn@umich.edu } 644484Sbinkertn@umich.edu 654484Sbinkertn@umich.edu msz = _libelf_msize(ELF_T_RELA, ec, e->e_version); 664484Sbinkertn@umich.edu 674484Sbinkertn@umich.edu assert(msz > 0); 684484Sbinkertn@umich.edu 694484Sbinkertn@umich.edu if (msz * ndx >= d->d_size) { 704484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 714484Sbinkertn@umich.edu return (NULL); 724484Sbinkertn@umich.edu } 734484Sbinkertn@umich.edu 744484Sbinkertn@umich.edu if (ec == ELFCLASS32) { 754484Sbinkertn@umich.edu rela32 = (Elf32_Rela *) d->d_buf + ndx; 764484Sbinkertn@umich.edu 774484Sbinkertn@umich.edu dst->r_offset = (Elf64_Addr) rela32->r_offset; 784484Sbinkertn@umich.edu dst->r_info = (Elf64_Xword) rela32->r_info; 794484Sbinkertn@umich.edu dst->r_addend = (Elf64_Sxword) rela32->r_addend; 804484Sbinkertn@umich.edu 814484Sbinkertn@umich.edu } else { 824484Sbinkertn@umich.edu 834484Sbinkertn@umich.edu rela64 = (Elf64_Rela *) d->d_buf + ndx; 844484Sbinkertn@umich.edu 854484Sbinkertn@umich.edu *dst = *rela64; 864484Sbinkertn@umich.edu } 874484Sbinkertn@umich.edu 884484Sbinkertn@umich.edu return (dst); 894484Sbinkertn@umich.edu} 904484Sbinkertn@umich.edu 914484Sbinkertn@umich.eduint 924484Sbinkertn@umich.edugelf_update_rela(Elf_Data *d, int ndx, GElf_Rela *dr) 934484Sbinkertn@umich.edu{ 944484Sbinkertn@umich.edu int ec; 954484Sbinkertn@umich.edu Elf *e; 964484Sbinkertn@umich.edu Elf_Scn *scn; 974484Sbinkertn@umich.edu Elf32_Rela *rela32; 984484Sbinkertn@umich.edu Elf64_Rela *rela64; 994484Sbinkertn@umich.edu size_t msz; 1004484Sbinkertn@umich.edu uint32_t sh_type; 1014484Sbinkertn@umich.edu 1024484Sbinkertn@umich.edu if (d == NULL || ndx < 0 || dr == NULL || 1034484Sbinkertn@umich.edu (scn = d->d_scn) == NULL || 1044484Sbinkertn@umich.edu (e = scn->s_elf) == NULL) { 1054484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 1064484Sbinkertn@umich.edu return (0); 1074484Sbinkertn@umich.edu } 1084484Sbinkertn@umich.edu 1094484Sbinkertn@umich.edu ec = e->e_class; 1104484Sbinkertn@umich.edu assert(ec == ELFCLASS32 || ec == ELFCLASS64); 1114484Sbinkertn@umich.edu 1124484Sbinkertn@umich.edu if (ec == ELFCLASS32) 1134484Sbinkertn@umich.edu sh_type = scn->s_shdr.s_shdr32.sh_type; 1144484Sbinkertn@umich.edu else 1154484Sbinkertn@umich.edu sh_type = scn->s_shdr.s_shdr64.sh_type; 1164484Sbinkertn@umich.edu 1174484Sbinkertn@umich.edu if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) { 1184484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 1194484Sbinkertn@umich.edu return (0); 1204484Sbinkertn@umich.edu } 1214484Sbinkertn@umich.edu 1224484Sbinkertn@umich.edu msz = _libelf_msize(ELF_T_RELA, ec, e->e_version); 1234484Sbinkertn@umich.edu assert(msz > 0); 1244484Sbinkertn@umich.edu 1254484Sbinkertn@umich.edu if (msz * ndx >= d->d_size) { 1264484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 1274484Sbinkertn@umich.edu return (0); 1284484Sbinkertn@umich.edu } 1294484Sbinkertn@umich.edu 1304484Sbinkertn@umich.edu if (ec == ELFCLASS32) { 1314484Sbinkertn@umich.edu rela32 = (Elf32_Rela *) d->d_buf + ndx; 1324484Sbinkertn@umich.edu 1334484Sbinkertn@umich.edu LIBELF_COPY_U32(rela32, dr, r_offset); 1344484Sbinkertn@umich.edu LIBELF_COPY_U32(rela32, dr, r_info); 1354484Sbinkertn@umich.edu LIBELF_COPY_S32(rela32, dr, r_addend); 1364484Sbinkertn@umich.edu } else { 1374484Sbinkertn@umich.edu rela64 = (Elf64_Rela *) d->d_buf + ndx; 1384484Sbinkertn@umich.edu 1394484Sbinkertn@umich.edu *rela64 = *dr; 1404484Sbinkertn@umich.edu } 1414484Sbinkertn@umich.edu 1424484Sbinkertn@umich.edu return (1); 1434484Sbinkertn@umich.edu} 144