1 /* $NetBSD: gelf_sym.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_sym.c,v 1.2 2014/03/09 16:58:04 christos Exp $"); 42 ELFTC_VCSID("Id: gelf_sym.c 2272 2011-12-03 17:07:31Z jkoshy "); 43 44 GElf_Sym * 45 gelf_getsym(Elf_Data *ed, int ndx, GElf_Sym *dst) 46 { 47 int ec; 48 Elf *e; 49 size_t msz; 50 Elf_Scn *scn; 51 uint32_t sh_type; 52 Elf32_Sym *sym32; 53 Elf64_Sym *sym64; 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_SYM) { 74 LIBELF_SET_ERROR(ARGUMENT, 0); 75 return (NULL); 76 } 77 78 msz = _libelf_msize(ELF_T_SYM, 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 89 sym32 = (Elf32_Sym *) d->d_data.d_buf + ndx; 90 91 dst->st_name = sym32->st_name; 92 dst->st_value = (Elf64_Addr) sym32->st_value; 93 dst->st_size = (Elf64_Xword) sym32->st_size; 94 dst->st_info = ELF64_ST_INFO(ELF32_ST_BIND(sym32->st_info), 95 ELF32_ST_TYPE(sym32->st_info)); 96 dst->st_other = sym32->st_other; 97 dst->st_shndx = sym32->st_shndx; 98 } else { 99 100 sym64 = (Elf64_Sym *) d->d_data.d_buf + ndx; 101 102 *dst = *sym64; 103 } 104 105 return (dst); 106 } 107 108 int 109 gelf_update_sym(Elf_Data *ed, int ndx, GElf_Sym *gs) 110 { 111 int ec; 112 Elf *e; 113 size_t msz; 114 Elf_Scn *scn; 115 uint32_t sh_type; 116 Elf32_Sym *sym32; 117 Elf64_Sym *sym64; 118 struct _Libelf_Data *d; 119 120 d = (struct _Libelf_Data *) ed; 121 122 if (d == NULL || ndx < 0 || gs == NULL || 123 (scn = d->d_scn) == NULL || 124 (e = scn->s_elf) == NULL) { 125 LIBELF_SET_ERROR(ARGUMENT, 0); 126 return (0); 127 } 128 129 ec = e->e_class; 130 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 131 132 if (ec == ELFCLASS32) 133 sh_type = scn->s_shdr.s_shdr32.sh_type; 134 else 135 sh_type = scn->s_shdr.s_shdr64.sh_type; 136 137 if (_libelf_xlate_shtype(sh_type) != ELF_T_SYM) { 138 LIBELF_SET_ERROR(ARGUMENT, 0); 139 return (0); 140 } 141 142 msz = _libelf_msize(ELF_T_SYM, ec, e->e_version); 143 assert(msz > 0); 144 145 if (msz * ndx >= d->d_data.d_size) { 146 LIBELF_SET_ERROR(ARGUMENT, 0); 147 return (0); 148 } 149 150 if (ec == ELFCLASS32) { 151 sym32 = (Elf32_Sym *) d->d_data.d_buf + ndx; 152 153 sym32->st_name = gs->st_name; 154 sym32->st_info = gs->st_info; 155 sym32->st_other = gs->st_other; 156 sym32->st_shndx = gs->st_shndx; 157 158 LIBELF_COPY_U32(sym32, gs, st_value); 159 LIBELF_COPY_U32(sym32, gs, st_size); 160 } else { 161 sym64 = (Elf64_Sym *) d->d_data.d_buf + ndx; 162 163 *sym64 = *gs; 164 } 165 166 return (1); 167 } 168