gelf_rela.c revision 176727
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: head/lib/libelf/gelf_rela.c 176727 2008-03-02 06:33:10Z jkoshy $"); 29 30#include <sys/limits.h> 31 32#include <assert.h> 33#include <gelf.h> 34 35#include "_libelf.h" 36 37GElf_Rela * 38gelf_getrela(Elf_Data *d, int ndx, GElf_Rela *dst) 39{ 40 int ec; 41 Elf *e; 42 Elf_Scn *scn; 43 Elf32_Rela *rela32; 44 Elf64_Rela *rela64; 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_RELA) { 64 LIBELF_SET_ERROR(ARGUMENT, 0); 65 return (NULL); 66 } 67 68 msz = _libelf_msize(ELF_T_RELA, 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 rela32 = (Elf32_Rela *) d->d_buf + ndx; 79 80 dst->r_offset = (Elf64_Addr) rela32->r_offset; 81 dst->r_info = ELF64_R_INFO( 82 (Elf64_Xword) ELF32_R_SYM(rela32->r_info), 83 ELF32_R_TYPE(rela32->r_info)); 84 dst->r_addend = (Elf64_Sxword) rela32->r_addend; 85 86 } else { 87 88 rela64 = (Elf64_Rela *) d->d_buf + ndx; 89 90 *dst = *rela64; 91 } 92 93 return (dst); 94} 95 96int 97gelf_update_rela(Elf_Data *d, int ndx, GElf_Rela *dr) 98{ 99 int ec; 100 Elf *e; 101 Elf_Scn *scn; 102 Elf32_Rela *rela32; 103 Elf64_Rela *rela64; 104 size_t msz; 105 uint32_t sh_type; 106 107 if (d == NULL || ndx < 0 || dr == NULL || 108 (scn = d->d_scn) == NULL || 109 (e = scn->s_elf) == NULL) { 110 LIBELF_SET_ERROR(ARGUMENT, 0); 111 return (0); 112 } 113 114 ec = e->e_class; 115 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 116 117 if (ec == ELFCLASS32) 118 sh_type = scn->s_shdr.s_shdr32.sh_type; 119 else 120 sh_type = scn->s_shdr.s_shdr64.sh_type; 121 122 if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) { 123 LIBELF_SET_ERROR(ARGUMENT, 0); 124 return (0); 125 } 126 127 msz = _libelf_msize(ELF_T_RELA, ec, e->e_version); 128 assert(msz > 0); 129 130 if (msz * ndx >= d->d_size) { 131 LIBELF_SET_ERROR(ARGUMENT, 0); 132 return (0); 133 } 134 135 if (ec == ELFCLASS32) { 136 rela32 = (Elf32_Rela *) d->d_buf + ndx; 137 138 LIBELF_COPY_U32(rela32, dr, r_offset); 139 140 if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0UL) || 141 ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) { 142 LIBELF_SET_ERROR(RANGE, 0); 143 return (0); 144 } 145 rela32->r_info = ELF32_R_INFO(ELF64_R_SYM(dr->r_info), 146 ELF64_R_TYPE(dr->r_info)); 147 148 LIBELF_COPY_S32(rela32, dr, r_addend); 149 } else { 150 rela64 = (Elf64_Rela *) d->d_buf + ndx; 151 152 *rela64 = *dr; 153 } 154 155 return (1); 156} 157