1 /* $NetBSD: gelf_rel.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_rel.c,v 1.2 2014/03/09 16:58:04 christos Exp $"); 42 ELFTC_VCSID("Id: gelf_rel.c 2272 2011-12-03 17:07:31Z jkoshy "); 43 44 GElf_Rel * 45 gelf_getrel(Elf_Data *ed, int ndx, GElf_Rel *dst) 46 { 47 int ec; 48 Elf *e; 49 size_t msz; 50 Elf_Scn *scn; 51 uint32_t sh_type; 52 Elf32_Rel *rel32; 53 Elf64_Rel *rel64; 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_REL) { 74 LIBELF_SET_ERROR(ARGUMENT, 0); 75 return (NULL); 76 } 77 78 msz = _libelf_msize(ELF_T_REL, 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 rel32 = (Elf32_Rel *) d->d_data.d_buf + ndx; 89 90 dst->r_offset = (Elf64_Addr) rel32->r_offset; 91 dst->r_info = ELF64_R_INFO( 92 (Elf64_Xword) ELF32_R_SYM(rel32->r_info), 93 ELF32_R_TYPE(rel32->r_info)); 94 95 } else { 96 97 rel64 = (Elf64_Rel *) d->d_data.d_buf + ndx; 98 99 *dst = *rel64; 100 } 101 102 return (dst); 103 } 104 105 int 106 gelf_update_rel(Elf_Data *ed, int ndx, GElf_Rel *dr) 107 { 108 int ec; 109 Elf *e; 110 size_t msz; 111 Elf_Scn *scn; 112 uint32_t sh_type; 113 Elf32_Rel *rel32; 114 Elf64_Rel *rel64; 115 struct _Libelf_Data *d; 116 117 d = (struct _Libelf_Data *) ed; 118 119 if (d == NULL || ndx < 0 || dr == NULL || 120 (scn = d->d_scn) == NULL || 121 (e = scn->s_elf) == NULL) { 122 LIBELF_SET_ERROR(ARGUMENT, 0); 123 return (0); 124 } 125 126 ec = e->e_class; 127 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 128 129 if (ec == ELFCLASS32) 130 sh_type = scn->s_shdr.s_shdr32.sh_type; 131 else 132 sh_type = scn->s_shdr.s_shdr64.sh_type; 133 134 if (_libelf_xlate_shtype(sh_type) != ELF_T_REL) { 135 LIBELF_SET_ERROR(ARGUMENT, 0); 136 return (0); 137 } 138 139 msz = _libelf_msize(ELF_T_REL, ec, e->e_version); 140 assert(msz > 0); 141 142 if (msz * ndx >= d->d_data.d_size) { 143 LIBELF_SET_ERROR(ARGUMENT, 0); 144 return (0); 145 } 146 147 if (ec == ELFCLASS32) { 148 rel32 = (Elf32_Rel *) d->d_data.d_buf + ndx; 149 150 LIBELF_COPY_U32(rel32, dr, r_offset); 151 152 if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0UL) || 153 ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) { 154 LIBELF_SET_ERROR(RANGE, 0); 155 return (0); 156 } 157 rel32->r_info = ELF32_R_INFO(ELF64_R_SYM(dr->r_info), 158 ELF64_R_TYPE(dr->r_info)); 159 } else { 160 rel64 = (Elf64_Rel *) d->d_data.d_buf + ndx; 161 162 *rel64 = *dr; 163 } 164 165 return (1); 166 } 167