1164190Sjkoshy/*- 2164190Sjkoshy * Copyright (c) 2006 Joseph Koshy 3164190Sjkoshy * All rights reserved. 4164190Sjkoshy * 5164190Sjkoshy * Redistribution and use in source and binary forms, with or without 6164190Sjkoshy * modification, are permitted provided that the following conditions 7164190Sjkoshy * are met: 8164190Sjkoshy * 1. Redistributions of source code must retain the above copyright 9164190Sjkoshy * notice, this list of conditions and the following disclaimer. 10164190Sjkoshy * 2. Redistributions in binary form must reproduce the above copyright 11164190Sjkoshy * notice, this list of conditions and the following disclaimer in the 12164190Sjkoshy * documentation and/or other materials provided with the distribution. 13164190Sjkoshy * 14164190Sjkoshy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15164190Sjkoshy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16164190Sjkoshy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17164190Sjkoshy * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18164190Sjkoshy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19164190Sjkoshy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20164190Sjkoshy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21164190Sjkoshy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22164190Sjkoshy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23164190Sjkoshy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24164190Sjkoshy * SUCH DAMAGE. 25164190Sjkoshy */ 26164190Sjkoshy 27164190Sjkoshy#include <sys/cdefs.h> 28164190Sjkoshy__FBSDID("$FreeBSD$"); 29164190Sjkoshy 30164190Sjkoshy#include <sys/limits.h> 31164190Sjkoshy 32164190Sjkoshy#include <assert.h> 33164190Sjkoshy#include <gelf.h> 34164190Sjkoshy 35164190Sjkoshy#include "_libelf.h" 36164190Sjkoshy 37164190SjkoshyGElf_Sym * 38164190Sjkoshygelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst, 39164190Sjkoshy Elf32_Word *shindex) 40164190Sjkoshy{ 41164190Sjkoshy int ec; 42164190Sjkoshy Elf *e; 43164190Sjkoshy Elf_Scn *scn; 44164190Sjkoshy size_t msz; 45164190Sjkoshy uint32_t sh_type; 46164190Sjkoshy 47164190Sjkoshy if (gelf_getsym(d, ndx, dst) == 0) 48164190Sjkoshy return (NULL); 49164190Sjkoshy 50164190Sjkoshy if (id == NULL || (scn = id->d_scn) == NULL || 51164190Sjkoshy (e = scn->s_elf) == NULL || (e != d->d_scn->s_elf) || 52164190Sjkoshy shindex == NULL) { 53164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 54164190Sjkoshy return (NULL); 55164190Sjkoshy } 56164190Sjkoshy 57164190Sjkoshy ec = e->e_class; 58164190Sjkoshy assert(ec == ELFCLASS32 || ec == ELFCLASS64); 59164190Sjkoshy 60164190Sjkoshy if (ec == ELFCLASS32) 61164190Sjkoshy sh_type = scn->s_shdr.s_shdr32.sh_type; 62164190Sjkoshy else 63164190Sjkoshy sh_type = scn->s_shdr.s_shdr64.sh_type; 64164190Sjkoshy 65164190Sjkoshy if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD || 66164190Sjkoshy id->d_type != ELF_T_WORD) { 67164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 68164190Sjkoshy return (NULL); 69164190Sjkoshy } 70164190Sjkoshy 71164190Sjkoshy msz = _libelf_msize(ELF_T_WORD, ec, e->e_version); 72164190Sjkoshy 73164190Sjkoshy assert(msz > 0); 74164190Sjkoshy 75164190Sjkoshy if (msz * ndx >= id->d_size) { 76164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 77164190Sjkoshy return (NULL); 78164190Sjkoshy } 79164190Sjkoshy 80164190Sjkoshy *shindex = ((Elf32_Word *) id->d_buf)[ndx]; 81164190Sjkoshy 82164190Sjkoshy return (dst); 83164190Sjkoshy} 84164190Sjkoshy 85164190Sjkoshyint 86164190Sjkoshygelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs, 87164190Sjkoshy Elf32_Word xindex) 88164190Sjkoshy{ 89164190Sjkoshy int ec; 90164190Sjkoshy Elf *e; 91164190Sjkoshy Elf_Scn *scn; 92164190Sjkoshy size_t msz; 93164190Sjkoshy uint32_t sh_type; 94164190Sjkoshy 95164190Sjkoshy if (gelf_update_sym(d, ndx, gs) == 0) 96164190Sjkoshy return (0); 97164190Sjkoshy 98164190Sjkoshy if (id == NULL || (scn = id->d_scn) == NULL || 99164190Sjkoshy (e = scn->s_elf) == NULL || (e != d->d_scn->s_elf)) { 100164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 101164190Sjkoshy return (0); 102164190Sjkoshy } 103164190Sjkoshy 104164190Sjkoshy ec = e->e_class; 105164190Sjkoshy assert(ec == ELFCLASS32 || ec == ELFCLASS64); 106164190Sjkoshy 107164190Sjkoshy if (ec == ELFCLASS32) 108164190Sjkoshy sh_type = scn->s_shdr.s_shdr32.sh_type; 109164190Sjkoshy else 110164190Sjkoshy sh_type = scn->s_shdr.s_shdr64.sh_type; 111164190Sjkoshy 112164190Sjkoshy if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD || 113164190Sjkoshy d->d_type != ELF_T_WORD) { 114164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 115164190Sjkoshy return (0); 116164190Sjkoshy } 117164190Sjkoshy 118164190Sjkoshy msz = _libelf_msize(ELF_T_WORD, ec, e->e_version); 119164190Sjkoshy assert(msz > 0); 120164190Sjkoshy 121164190Sjkoshy if (msz * ndx >= id->d_size) { 122164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 123164190Sjkoshy return (0); 124164190Sjkoshy } 125164190Sjkoshy 126164190Sjkoshy *(((Elf32_Word *) id->d_buf) + ndx) = xindex; 127164190Sjkoshy 128164190Sjkoshy return (1); 129164190Sjkoshy} 130