1 /* $NetBSD: gelf_sym.c,v 1.3 2016/02/20 02:43:42 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 #include <stdint.h> 39 40 #include "_libelf.h" 41 42 __RCSID("$NetBSD: gelf_sym.c,v 1.3 2016/02/20 02:43:42 christos Exp $"); 43 ELFTC_VCSID("Id: gelf_sym.c 3177 2015-03-30 18:19:41Z emaste "); 44 45 GElf_Sym * 46 gelf_getsym(Elf_Data *ed, int ndx, GElf_Sym *dst) 47 { 48 int ec; 49 Elf *e; 50 size_t msz; 51 Elf_Scn *scn; 52 uint32_t sh_type; 53 Elf32_Sym *sym32; 54 Elf64_Sym *sym64; 55 struct _Libelf_Data *d; 56 57 d = (struct _Libelf_Data *) ed; 58 59 if (d == NULL || ndx < 0 || dst == NULL || 60 (scn = d->d_scn) == NULL || 61 (e = scn->s_elf) == NULL) { 62 LIBELF_SET_ERROR(ARGUMENT, 0); 63 return (NULL); 64 } 65 66 ec = e->e_class; 67 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 68 69 if (ec == ELFCLASS32) 70 sh_type = scn->s_shdr.s_shdr32.sh_type; 71 else 72 sh_type = scn->s_shdr.s_shdr64.sh_type; 73 74 if (_libelf_xlate_shtype(sh_type) != ELF_T_SYM) { 75 LIBELF_SET_ERROR(ARGUMENT, 0); 76 return (NULL); 77 } 78 79 msz = _libelf_msize(ELF_T_SYM, ec, e->e_version); 80 81 assert(msz > 0); 82 assert(ndx >= 0); 83 84 if (msz * (size_t) ndx >= d->d_data.d_size) { 85 LIBELF_SET_ERROR(ARGUMENT, 0); 86 return (NULL); 87 } 88 89 if (ec == ELFCLASS32) { 90 sym32 = (Elf32_Sym *) d->d_data.d_buf + ndx; 91 92 dst->st_name = sym32->st_name; 93 dst->st_value = (Elf64_Addr) sym32->st_value; 94 dst->st_size = (Elf64_Xword) sym32->st_size; 95 dst->st_info = sym32->st_info; 96 dst->st_other = sym32->st_other; 97 dst->st_shndx = sym32->st_shndx; 98 } else { 99 sym64 = (Elf64_Sym *) d->d_data.d_buf + ndx; 100 101 *dst = *sym64; 102 } 103 104 return (dst); 105 } 106 107 int 108 gelf_update_sym(Elf_Data *ed, int ndx, GElf_Sym *gs) 109 { 110 int ec; 111 Elf *e; 112 size_t msz; 113 Elf_Scn *scn; 114 uint32_t sh_type; 115 Elf32_Sym *sym32; 116 Elf64_Sym *sym64; 117 struct _Libelf_Data *d; 118 119 d = (struct _Libelf_Data *) ed; 120 121 if (d == NULL || ndx < 0 || gs == NULL || 122 (scn = d->d_scn) == NULL || 123 (e = scn->s_elf) == NULL) { 124 LIBELF_SET_ERROR(ARGUMENT, 0); 125 return (0); 126 } 127 128 ec = e->e_class; 129 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 130 131 if (ec == ELFCLASS32) 132 sh_type = scn->s_shdr.s_shdr32.sh_type; 133 else 134 sh_type = scn->s_shdr.s_shdr64.sh_type; 135 136 if (_libelf_xlate_shtype(sh_type) != ELF_T_SYM) { 137 LIBELF_SET_ERROR(ARGUMENT, 0); 138 return (0); 139 } 140 141 msz = _libelf_msize(ELF_T_SYM, ec, e->e_version); 142 143 assert(msz > 0); 144 assert(ndx >= 0); 145 146 if (msz * (size_t) ndx >= d->d_data.d_size) { 147 LIBELF_SET_ERROR(ARGUMENT, 0); 148 return (0); 149 } 150 151 if (ec == ELFCLASS32) { 152 sym32 = (Elf32_Sym *) d->d_data.d_buf + ndx; 153 154 sym32->st_name = gs->st_name; 155 sym32->st_info = gs->st_info; 156 sym32->st_other = gs->st_other; 157 sym32->st_shndx = gs->st_shndx; 158 159 LIBELF_COPY_U32(sym32, gs, st_value); 160 LIBELF_COPY_U32(sym32, gs, st_size); 161 } else { 162 sym64 = (Elf64_Sym *) d->d_data.d_buf + ndx; 163 164 *sym64 = *gs; 165 } 166 167 return (1); 168 } 169