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("$FreeBSD$"); 29 30#include <sys/limits.h> 31 32#include <assert.h> 33#include <gelf.h> 34 35#include "_libelf.h" 36 37GElf_Sym * 38gelf_getsym(Elf_Data *d, int ndx, GElf_Sym *dst) 39{ 40 int ec; 41 Elf *e; 42 Elf_Scn *scn; 43 Elf32_Sym *sym32; 44 Elf64_Sym *sym64; 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_SYM) { 64 LIBELF_SET_ERROR(ARGUMENT, 0); 65 return (NULL); 66 } 67 68 msz = _libelf_msize(ELF_T_SYM, 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 79 sym32 = (Elf32_Sym *) d->d_buf + ndx; 80 81 dst->st_name = sym32->st_name; 82 dst->st_value = (Elf64_Addr) sym32->st_value; 83 dst->st_size = (Elf64_Xword) sym32->st_size; 84 dst->st_info = ELF64_ST_INFO(ELF32_ST_BIND(sym32->st_info), 85 ELF32_ST_TYPE(sym32->st_info)); 86 dst->st_other = sym32->st_other; 87 dst->st_shndx = sym32->st_shndx; 88 } else { 89 90 sym64 = (Elf64_Sym *) d->d_buf + ndx; 91 92 *dst = *sym64; 93 } 94 95 return (dst); 96} 97 98int 99gelf_update_sym(Elf_Data *d, int ndx, GElf_Sym *gs) 100{ 101 int ec; 102 Elf *e; 103 Elf_Scn *scn; 104 Elf32_Sym *sym32; 105 Elf64_Sym *sym64; 106 size_t msz; 107 uint32_t sh_type; 108 109 if (d == NULL || ndx < 0 || gs == NULL || 110 (scn = d->d_scn) == NULL || 111 (e = scn->s_elf) == NULL) { 112 LIBELF_SET_ERROR(ARGUMENT, 0); 113 return (0); 114 } 115 116 ec = e->e_class; 117 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 118 119 if (ec == ELFCLASS32) 120 sh_type = scn->s_shdr.s_shdr32.sh_type; 121 else 122 sh_type = scn->s_shdr.s_shdr64.sh_type; 123 124 if (_libelf_xlate_shtype(sh_type) != ELF_T_SYM) { 125 LIBELF_SET_ERROR(ARGUMENT, 0); 126 return (0); 127 } 128 129 msz = _libelf_msize(ELF_T_SYM, ec, e->e_version); 130 assert(msz > 0); 131 132 if (msz * ndx >= d->d_size) { 133 LIBELF_SET_ERROR(ARGUMENT, 0); 134 return (0); 135 } 136 137 if (ec == ELFCLASS32) { 138 sym32 = (Elf32_Sym *) d->d_buf + ndx; 139 140 sym32->st_name = gs->st_name; 141 sym32->st_info = gs->st_info; 142 sym32->st_other = gs->st_other; 143 sym32->st_shndx = gs->st_shndx; 144 145 LIBELF_COPY_U32(sym32, gs, st_value); 146 LIBELF_COPY_U32(sym32, gs, st_size); 147 } else { 148 sym64 = (Elf64_Sym *) d->d_buf + ndx; 149 150 *sym64 = *gs; 151 } 152 153 return (1); 154} 155