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 <assert.h> 284484Sbinkertn@umich.edu#include <limits.h> 294484Sbinkertn@umich.edu 304484Sbinkertn@umich.edu#include "gelf.h" 314484Sbinkertn@umich.edu#include "_libelf.h" 324484Sbinkertn@umich.edu 334484Sbinkertn@umich.eduGElf_Dyn * 344484Sbinkertn@umich.edugelf_getdyn(Elf_Data *d, int ndx, GElf_Dyn *dst) 354484Sbinkertn@umich.edu{ 364484Sbinkertn@umich.edu int ec; 374484Sbinkertn@umich.edu Elf *e; 384484Sbinkertn@umich.edu Elf_Scn *scn; 394484Sbinkertn@umich.edu Elf32_Dyn *dyn32; 404484Sbinkertn@umich.edu Elf64_Dyn *dyn64; 414484Sbinkertn@umich.edu size_t msz; 424484Sbinkertn@umich.edu uint32_t sh_type; 434484Sbinkertn@umich.edu 444484Sbinkertn@umich.edu if (d == NULL || ndx < 0 || dst == NULL || 454484Sbinkertn@umich.edu (scn = d->d_scn) == NULL || 464484Sbinkertn@umich.edu (e = scn->s_elf) == NULL) { 474484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 484484Sbinkertn@umich.edu return (NULL); 494484Sbinkertn@umich.edu } 504484Sbinkertn@umich.edu 514484Sbinkertn@umich.edu ec = e->e_class; 524484Sbinkertn@umich.edu assert(ec == ELFCLASS32 || ec == ELFCLASS64); 534484Sbinkertn@umich.edu 544484Sbinkertn@umich.edu if (ec == ELFCLASS32) 554484Sbinkertn@umich.edu sh_type = scn->s_shdr.s_shdr32.sh_type; 564484Sbinkertn@umich.edu else 574484Sbinkertn@umich.edu sh_type = scn->s_shdr.s_shdr64.sh_type; 584484Sbinkertn@umich.edu 594484Sbinkertn@umich.edu if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) { 604484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 614484Sbinkertn@umich.edu return (NULL); 624484Sbinkertn@umich.edu } 634484Sbinkertn@umich.edu 644484Sbinkertn@umich.edu msz = _libelf_msize(ELF_T_DYN, ec, e->e_version); 654484Sbinkertn@umich.edu 664484Sbinkertn@umich.edu assert(msz > 0); 674484Sbinkertn@umich.edu 684484Sbinkertn@umich.edu if (msz * ndx >= d->d_size) { 694484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 704484Sbinkertn@umich.edu return (NULL); 714484Sbinkertn@umich.edu } 724484Sbinkertn@umich.edu 734484Sbinkertn@umich.edu if (ec == ELFCLASS32) { 744484Sbinkertn@umich.edu dyn32 = (Elf32_Dyn *) d->d_buf + ndx; 754484Sbinkertn@umich.edu 764484Sbinkertn@umich.edu dst->d_tag = dyn32->d_tag; 774484Sbinkertn@umich.edu dst->d_un.d_val = (Elf64_Xword) dyn32->d_un.d_val; 784484Sbinkertn@umich.edu 794484Sbinkertn@umich.edu } else { 804484Sbinkertn@umich.edu 814484Sbinkertn@umich.edu dyn64 = (Elf64_Dyn *) d->d_buf + ndx; 824484Sbinkertn@umich.edu 834484Sbinkertn@umich.edu *dst = *dyn64; 844484Sbinkertn@umich.edu } 854484Sbinkertn@umich.edu 864484Sbinkertn@umich.edu return (dst); 874484Sbinkertn@umich.edu} 884484Sbinkertn@umich.edu 894484Sbinkertn@umich.eduint 904484Sbinkertn@umich.edugelf_update_dyn(Elf_Data *d, int ndx, GElf_Dyn *ds) 914484Sbinkertn@umich.edu{ 924484Sbinkertn@umich.edu int ec; 934484Sbinkertn@umich.edu Elf *e; 944484Sbinkertn@umich.edu Elf_Scn *scn; 954484Sbinkertn@umich.edu Elf32_Dyn *dyn32; 964484Sbinkertn@umich.edu Elf64_Dyn *dyn64; 974484Sbinkertn@umich.edu size_t msz; 984484Sbinkertn@umich.edu uint32_t sh_type; 994484Sbinkertn@umich.edu 1004484Sbinkertn@umich.edu if (d == NULL || ndx < 0 || ds == NULL || 1014484Sbinkertn@umich.edu (scn = d->d_scn) == NULL || 1024484Sbinkertn@umich.edu (e = scn->s_elf) == NULL) { 1034484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 1044484Sbinkertn@umich.edu return (0); 1054484Sbinkertn@umich.edu } 1064484Sbinkertn@umich.edu 1074484Sbinkertn@umich.edu ec = e->e_class; 1084484Sbinkertn@umich.edu assert(ec == ELFCLASS32 || ec == ELFCLASS64); 1094484Sbinkertn@umich.edu 1104484Sbinkertn@umich.edu if (ec == ELFCLASS32) 1114484Sbinkertn@umich.edu sh_type = scn->s_shdr.s_shdr32.sh_type; 1124484Sbinkertn@umich.edu else 1134484Sbinkertn@umich.edu sh_type = scn->s_shdr.s_shdr64.sh_type; 1144484Sbinkertn@umich.edu 1154484Sbinkertn@umich.edu if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) { 1164484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 1174484Sbinkertn@umich.edu return (0); 1184484Sbinkertn@umich.edu } 1194484Sbinkertn@umich.edu 1204484Sbinkertn@umich.edu msz = _libelf_msize(ELF_T_DYN, ec, e->e_version); 1214484Sbinkertn@umich.edu assert(msz > 0); 1224484Sbinkertn@umich.edu 1234484Sbinkertn@umich.edu if (msz * ndx >= d->d_size) { 1244484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 1254484Sbinkertn@umich.edu return (0); 1264484Sbinkertn@umich.edu } 1274484Sbinkertn@umich.edu 1284484Sbinkertn@umich.edu if (ec == ELFCLASS32) { 1294484Sbinkertn@umich.edu dyn32 = (Elf32_Dyn *) d->d_buf + ndx; 1304484Sbinkertn@umich.edu 1314484Sbinkertn@umich.edu LIBELF_COPY_S32(dyn32, ds, d_tag); 1324484Sbinkertn@umich.edu LIBELF_COPY_U32(dyn32, ds, d_un.d_val); 1334484Sbinkertn@umich.edu } else { 1344484Sbinkertn@umich.edu dyn64 = (Elf64_Dyn *) d->d_buf + ndx; 1354484Sbinkertn@umich.edu 1364484Sbinkertn@umich.edu *dyn64 = *ds; 1374484Sbinkertn@umich.edu } 1384484Sbinkertn@umich.edu 1394484Sbinkertn@umich.edu return (1); 1404484Sbinkertn@umich.edu} 141