1/*- 2 * Copyright (c) 2006 Joseph Koshy 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD$"); 29 30#include <sys/limits.h> 31 32#include <assert.h> 33#include <gelf.h> 34 35#include "_libelf.h" 36 37GElf_Sym * 38gelf_getsymshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *dst, 39 Elf32_Word *shindex) 40{ 41 int ec; 42 Elf *e; 43 Elf_Scn *scn; 44 size_t msz; 45 uint32_t sh_type; 46 47 if (gelf_getsym(d, ndx, dst) == 0) 48 return (NULL); 49 50 if (id == NULL || (scn = id->d_scn) == NULL || 51 (e = scn->s_elf) == NULL || (e != d->d_scn->s_elf) || 52 shindex == NULL) { 53 LIBELF_SET_ERROR(ARGUMENT, 0); 54 return (NULL); 55 } 56 57 ec = e->e_class; 58 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 59 60 if (ec == ELFCLASS32) 61 sh_type = scn->s_shdr.s_shdr32.sh_type; 62 else 63 sh_type = scn->s_shdr.s_shdr64.sh_type; 64 65 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD || 66 id->d_type != ELF_T_WORD) { 67 LIBELF_SET_ERROR(ARGUMENT, 0); 68 return (NULL); 69 } 70 71 msz = _libelf_msize(ELF_T_WORD, ec, e->e_version); 72 73 assert(msz > 0); 74 75 if (msz * ndx >= id->d_size) { 76 LIBELF_SET_ERROR(ARGUMENT, 0); 77 return (NULL); 78 } 79 80 *shindex = ((Elf32_Word *) id->d_buf)[ndx]; 81 82 return (dst); 83} 84 85int 86gelf_update_symshndx(Elf_Data *d, Elf_Data *id, int ndx, GElf_Sym *gs, 87 Elf32_Word xindex) 88{ 89 int ec; 90 Elf *e; 91 Elf_Scn *scn; 92 size_t msz; 93 uint32_t sh_type; 94 95 if (gelf_update_sym(d, ndx, gs) == 0) 96 return (0); 97 98 if (id == NULL || (scn = id->d_scn) == NULL || 99 (e = scn->s_elf) == NULL || (e != d->d_scn->s_elf)) { 100 LIBELF_SET_ERROR(ARGUMENT, 0); 101 return (0); 102 } 103 104 ec = e->e_class; 105 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 106 107 if (ec == ELFCLASS32) 108 sh_type = scn->s_shdr.s_shdr32.sh_type; 109 else 110 sh_type = scn->s_shdr.s_shdr64.sh_type; 111 112 if (_libelf_xlate_shtype(sh_type) != ELF_T_WORD || 113 d->d_type != ELF_T_WORD) { 114 LIBELF_SET_ERROR(ARGUMENT, 0); 115 return (0); 116 } 117 118 msz = _libelf_msize(ELF_T_WORD, ec, e->e_version); 119 assert(msz > 0); 120 121 if (msz * ndx >= id->d_size) { 122 LIBELF_SET_ERROR(ARGUMENT, 0); 123 return (0); 124 } 125 126 *(((Elf32_Word *) id->d_buf) + ndx) = xindex; 127 128 return (1); 129} 130