1 /* $NetBSD: gelf_rela.c,v 1.2 2014/03/09 16:58:04 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2006,2008 Joseph Koshy 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #if HAVE_NBTOOL_CONFIG_H 30 # include "nbtool_config.h" 31 #endif 32 33 #include <sys/cdefs.h> 34 35 #include <assert.h> 36 #include <gelf.h> 37 #include <limits.h> 38 39 #include "_libelf.h" 40 41 __RCSID("$NetBSD: gelf_rela.c,v 1.2 2014/03/09 16:58:04 christos Exp $"); 42 ELFTC_VCSID("Id: gelf_rela.c 2272 2011-12-03 17:07:31Z jkoshy "); 43 44 GElf_Rela * 45 gelf_getrela(Elf_Data *ed, int ndx, GElf_Rela *dst) 46 { 47 int ec; 48 Elf *e; 49 size_t msz; 50 Elf_Scn *scn; 51 uint32_t sh_type; 52 Elf32_Rela *rela32; 53 Elf64_Rela *rela64; 54 struct _Libelf_Data *d; 55 56 d = (struct _Libelf_Data *) ed; 57 58 if (d == NULL || ndx < 0 || dst == NULL || 59 (scn = d->d_scn) == NULL || 60 (e = scn->s_elf) == NULL) { 61 LIBELF_SET_ERROR(ARGUMENT, 0); 62 return (NULL); 63 } 64 65 ec = e->e_class; 66 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 67 68 if (ec == ELFCLASS32) 69 sh_type = scn->s_shdr.s_shdr32.sh_type; 70 else 71 sh_type = scn->s_shdr.s_shdr64.sh_type; 72 73 if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) { 74 LIBELF_SET_ERROR(ARGUMENT, 0); 75 return (NULL); 76 } 77 78 msz = _libelf_msize(ELF_T_RELA, ec, e->e_version); 79 80 assert(msz > 0); 81 82 if (msz * ndx >= d->d_data.d_size) { 83 LIBELF_SET_ERROR(ARGUMENT, 0); 84 return (NULL); 85 } 86 87 if (ec == ELFCLASS32) { 88 rela32 = (Elf32_Rela *) d->d_data.d_buf + ndx; 89 90 dst->r_offset = (Elf64_Addr) rela32->r_offset; 91 dst->r_info = ELF64_R_INFO( 92 (Elf64_Xword) ELF32_R_SYM(rela32->r_info), 93 ELF32_R_TYPE(rela32->r_info)); 94 dst->r_addend = (Elf64_Sxword) rela32->r_addend; 95 96 } else { 97 98 rela64 = (Elf64_Rela *) d->d_data.d_buf + ndx; 99 100 *dst = *rela64; 101 } 102 103 return (dst); 104 } 105 106 int 107 gelf_update_rela(Elf_Data *ed, int ndx, GElf_Rela *dr) 108 { 109 int ec; 110 Elf *e; 111 size_t msz; 112 Elf_Scn *scn; 113 uint32_t sh_type; 114 Elf32_Rela *rela32; 115 Elf64_Rela *rela64; 116 struct _Libelf_Data *d; 117 118 d = (struct _Libelf_Data *) ed; 119 120 if (d == NULL || ndx < 0 || dr == NULL || 121 (scn = d->d_scn) == NULL || 122 (e = scn->s_elf) == NULL) { 123 LIBELF_SET_ERROR(ARGUMENT, 0); 124 return (0); 125 } 126 127 ec = e->e_class; 128 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 129 130 if (ec == ELFCLASS32) 131 sh_type = scn->s_shdr.s_shdr32.sh_type; 132 else 133 sh_type = scn->s_shdr.s_shdr64.sh_type; 134 135 if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) { 136 LIBELF_SET_ERROR(ARGUMENT, 0); 137 return (0); 138 } 139 140 msz = _libelf_msize(ELF_T_RELA, ec, e->e_version); 141 assert(msz > 0); 142 143 if (msz * ndx >= d->d_data.d_size) { 144 LIBELF_SET_ERROR(ARGUMENT, 0); 145 return (0); 146 } 147 148 if (ec == ELFCLASS32) { 149 rela32 = (Elf32_Rela *) d->d_data.d_buf + ndx; 150 151 LIBELF_COPY_U32(rela32, dr, r_offset); 152 153 if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0UL) || 154 ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) { 155 LIBELF_SET_ERROR(RANGE, 0); 156 return (0); 157 } 158 rela32->r_info = ELF32_R_INFO(ELF64_R_SYM(dr->r_info), 159 ELF64_R_TYPE(dr->r_info)); 160 161 LIBELF_COPY_S32(rela32, dr, r_addend); 162 } else { 163 rela64 = (Elf64_Rela *) d->d_data.d_buf + ndx; 164 165 *rela64 = *dr; 166 } 167 168 return (1); 169 } 170