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_Dyn * 38gelf_getdyn(Elf_Data *d, int ndx, GElf_Dyn *dst) 39{ 40 int ec; 41 Elf *e; 42 Elf_Scn *scn; 43 Elf32_Dyn *dyn32; 44 Elf64_Dyn *dyn64; 45 size_t msz; 46 uint32_t sh_type; 47 48 if (d == NULL || ndx < 0 || dst == NULL || 49 (scn = d->d_scn) == NULL || 50 (e = scn->s_elf) == NULL) { 51 LIBELF_SET_ERROR(ARGUMENT, 0); 52 return (NULL); 53 } 54 55 ec = e->e_class; 56 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 57 58 if (ec == ELFCLASS32) 59 sh_type = scn->s_shdr.s_shdr32.sh_type; 60 else 61 sh_type = scn->s_shdr.s_shdr64.sh_type; 62 63 if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) { 64 LIBELF_SET_ERROR(ARGUMENT, 0); 65 return (NULL); 66 } 67 68 msz = _libelf_msize(ELF_T_DYN, ec, e->e_version); 69 70 assert(msz > 0); 71 72 if (msz * ndx >= d->d_size) { 73 LIBELF_SET_ERROR(ARGUMENT, 0); 74 return (NULL); 75 } 76 77 if (ec == ELFCLASS32) { 78 dyn32 = (Elf32_Dyn *) d->d_buf + ndx; 79 80 dst->d_tag = dyn32->d_tag; 81 dst->d_un.d_val = (Elf64_Xword) dyn32->d_un.d_val; 82 83 } else { 84 85 dyn64 = (Elf64_Dyn *) d->d_buf + ndx; 86 87 *dst = *dyn64; 88 } 89 90 return (dst); 91} 92 93int 94gelf_update_dyn(Elf_Data *d, int ndx, GElf_Dyn *ds) 95{ 96 int ec; 97 Elf *e; 98 Elf_Scn *scn; 99 Elf32_Dyn *dyn32; 100 Elf64_Dyn *dyn64; 101 size_t msz; 102 uint32_t sh_type; 103 104 if (d == NULL || ndx < 0 || ds == NULL || 105 (scn = d->d_scn) == NULL || 106 (e = scn->s_elf) == NULL) { 107 LIBELF_SET_ERROR(ARGUMENT, 0); 108 return (0); 109 } 110 111 ec = e->e_class; 112 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 113 114 if (ec == ELFCLASS32) 115 sh_type = scn->s_shdr.s_shdr32.sh_type; 116 else 117 sh_type = scn->s_shdr.s_shdr64.sh_type; 118 119 if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) { 120 LIBELF_SET_ERROR(ARGUMENT, 0); 121 return (0); 122 } 123 124 msz = _libelf_msize(ELF_T_DYN, ec, e->e_version); 125 assert(msz > 0); 126 127 if (msz * ndx >= d->d_size) { 128 LIBELF_SET_ERROR(ARGUMENT, 0); 129 return (0); 130 } 131 132 if (ec == ELFCLASS32) { 133 dyn32 = (Elf32_Dyn *) d->d_buf + ndx; 134 135 LIBELF_COPY_S32(dyn32, ds, d_tag); 136 LIBELF_COPY_U32(dyn32, ds, d_un.d_val); 137 } else { 138 dyn64 = (Elf64_Dyn *) d->d_buf + ndx; 139 140 *dyn64 = *ds; 141 } 142 143 return (1); 144} 145