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_Sym * 354484Sbinkertn@umich.edugelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst, 364484Sbinkertn@umich.edu Elf32_Word *shindex) 374484Sbinkertn@umich.edu{ 384484Sbinkertn@umich.edu int ec; 394484Sbinkertn@umich.edu Elf *e; 404484Sbinkertn@umich.edu Elf_Scn *scn; 414484Sbinkertn@umich.edu size_t msz; 424484Sbinkertn@umich.edu uint32_t sh_type; 434484Sbinkertn@umich.edu 444484Sbinkertn@umich.edu if (gelf_getsym(d, ndx, dst) == 0) 454484Sbinkertn@umich.edu return (NULL); 464484Sbinkertn@umich.edu 474484Sbinkertn@umich.edu if (id == NULL || (scn = id->d_scn) == NULL || 484484Sbinkertn@umich.edu (e = scn->s_elf) == NULL || (e != d->d_scn->s_elf) || 494484Sbinkertn@umich.edu shindex == NULL) { 504484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 514484Sbinkertn@umich.edu return (NULL); 524484Sbinkertn@umich.edu } 534484Sbinkertn@umich.edu 544484Sbinkertn@umich.edu ec = e->e_class; 554484Sbinkertn@umich.edu assert(ec == ELFCLASS32 || ec == ELFCLASS64); 564484Sbinkertn@umich.edu 574484Sbinkertn@umich.edu if (ec == ELFCLASS32) 584484Sbinkertn@umich.edu sh_type = scn->s_shdr.s_shdr32.sh_type; 594484Sbinkertn@umich.edu else 604484Sbinkertn@umich.edu sh_type = scn->s_shdr.s_shdr64.sh_type; 614484Sbinkertn@umich.edu 624484Sbinkertn@umich.edu if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD || 634484Sbinkertn@umich.edu id->d_type != ELF_T_WORD) { 644484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 654484Sbinkertn@umich.edu return (NULL); 664484Sbinkertn@umich.edu } 674484Sbinkertn@umich.edu 684484Sbinkertn@umich.edu msz = _libelf_msize(ELF_T_WORD, ec, e->e_version); 694484Sbinkertn@umich.edu 704484Sbinkertn@umich.edu assert(msz > 0); 714484Sbinkertn@umich.edu 724484Sbinkertn@umich.edu if (msz * ndx >= id->d_size) { 734484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 744484Sbinkertn@umich.edu return (NULL); 754484Sbinkertn@umich.edu } 764484Sbinkertn@umich.edu 774484Sbinkertn@umich.edu *shindex = ((Elf32_Word *) id->d_buf)[ndx]; 784484Sbinkertn@umich.edu 794484Sbinkertn@umich.edu return (dst); 804484Sbinkertn@umich.edu} 814484Sbinkertn@umich.edu 824484Sbinkertn@umich.eduint 834484Sbinkertn@umich.edugelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs, 844484Sbinkertn@umich.edu Elf32_Word xindex) 854484Sbinkertn@umich.edu{ 864484Sbinkertn@umich.edu int ec; 874484Sbinkertn@umich.edu Elf *e; 884484Sbinkertn@umich.edu Elf_Scn *scn; 894484Sbinkertn@umich.edu size_t msz; 904484Sbinkertn@umich.edu uint32_t sh_type; 914484Sbinkertn@umich.edu 924484Sbinkertn@umich.edu if (gelf_update_sym(d, ndx, gs) == 0) 934484Sbinkertn@umich.edu return (0); 944484Sbinkertn@umich.edu 954484Sbinkertn@umich.edu if (id == NULL || (scn = id->d_scn) == NULL || 964484Sbinkertn@umich.edu (e = scn->s_elf) == NULL || (e != d->d_scn->s_elf)) { 974484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 984484Sbinkertn@umich.edu return (0); 994484Sbinkertn@umich.edu } 1004484Sbinkertn@umich.edu 1014484Sbinkertn@umich.edu ec = e->e_class; 1024484Sbinkertn@umich.edu assert(ec == ELFCLASS32 || ec == ELFCLASS64); 1034484Sbinkertn@umich.edu 1044484Sbinkertn@umich.edu if (ec == ELFCLASS32) 1054484Sbinkertn@umich.edu sh_type = scn->s_shdr.s_shdr32.sh_type; 1064484Sbinkertn@umich.edu else 1074484Sbinkertn@umich.edu sh_type = scn->s_shdr.s_shdr64.sh_type; 1084484Sbinkertn@umich.edu 1094484Sbinkertn@umich.edu if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD || 1104484Sbinkertn@umich.edu d->d_type != ELF_T_WORD) { 1114484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 1124484Sbinkertn@umich.edu return (0); 1134484Sbinkertn@umich.edu } 1144484Sbinkertn@umich.edu 1154484Sbinkertn@umich.edu msz = _libelf_msize(ELF_T_WORD, ec, e->e_version); 1164484Sbinkertn@umich.edu assert(msz > 0); 1174484Sbinkertn@umich.edu 1184484Sbinkertn@umich.edu if (msz * ndx >= id->d_size) { 1194484Sbinkertn@umich.edu LIBELF_SET_ERROR(ARGUMENT, 0); 1204484Sbinkertn@umich.edu return (0); 1214484Sbinkertn@umich.edu } 1224484Sbinkertn@umich.edu 1234484Sbinkertn@umich.edu *(((Elf32_Word *) id->d_buf) + ndx) = xindex; 1244484Sbinkertn@umich.edu 1254484Sbinkertn@umich.edu return (1); 1264484Sbinkertn@umich.edu} 127