1 /*- 2 * Copyright (c) 2006,2008 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 29 #include <assert.h> 30 #include <gelf.h> 31 #include <libelf.h> 32 #include <limits.h> 33 #include <stdint.h> 34 #include <string.h> 35 36 #include "_libelf.h" 37 38 ELFTC_VCSID("$Id: gelf_ehdr.c 2268 2011-12-03 17:05:11Z jkoshy $"); 39 40 Elf32_Ehdr * 41 elf32_getehdr(Elf *e) 42 { 43 return (_libelf_ehdr(e, ELFCLASS32, 0)); 44 } 45 46 Elf64_Ehdr * 47 elf64_getehdr(Elf *e) 48 { 49 return (_libelf_ehdr(e, ELFCLASS64, 0)); 50 } 51 52 GElf_Ehdr * 53 gelf_getehdr(Elf *e, GElf_Ehdr *d) 54 { 55 int ec; 56 Elf32_Ehdr *eh32; 57 Elf64_Ehdr *eh64; 58 59 if (d == NULL || e == NULL || 60 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) { 61 LIBELF_SET_ERROR(ARGUMENT, 0); 62 return (NULL); 63 } 64 65 if (ec == ELFCLASS32) { 66 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL) 67 return (NULL); 68 69 (void) memcpy(d->e_ident, eh32->e_ident, 70 sizeof(eh32->e_ident)); 71 d->e_type = eh32->e_type; 72 d->e_machine = eh32->e_machine; 73 d->e_version = eh32->e_version; 74 d->e_entry = eh32->e_entry; 75 d->e_phoff = eh32->e_phoff; 76 d->e_shoff = eh32->e_shoff; 77 d->e_flags = eh32->e_flags; 78 d->e_ehsize = eh32->e_ehsize; 79 d->e_phentsize = eh32->e_phentsize; 80 d->e_phnum = eh32->e_phnum; 81 d->e_shentsize = eh32->e_shentsize; 82 d->e_shnum = eh32->e_shnum; 83 d->e_shstrndx = eh32->e_shstrndx; 84 85 return (d); 86 } 87 88 assert(ec == ELFCLASS64); 89 90 if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL) 91 return (NULL); 92 *d = *eh64; 93 94 return (d); 95 } 96 97 Elf32_Ehdr * 98 elf32_newehdr(Elf *e) 99 { 100 return (_libelf_ehdr(e, ELFCLASS32, 1)); 101 } 102 103 Elf64_Ehdr * 104 elf64_newehdr(Elf *e) 105 { 106 return (_libelf_ehdr(e, ELFCLASS64, 1)); 107 } 108 109 void * 110 gelf_newehdr(Elf *e, int ec) 111 { 112 if (e != NULL && 113 (ec == ELFCLASS32 || ec == ELFCLASS64)) 114 return (_libelf_ehdr(e, ec, 1)); 115 116 LIBELF_SET_ERROR(ARGUMENT, 0); 117 return (NULL); 118 } 119 120 int 121 gelf_update_ehdr(Elf *e, GElf_Ehdr *s) 122 { 123 int ec; 124 void *ehdr; 125 Elf32_Ehdr *eh32; 126 Elf64_Ehdr *eh64; 127 128 if (s== NULL || e == NULL || e->e_kind != ELF_K_ELF || 129 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) { 130 LIBELF_SET_ERROR(ARGUMENT, 0); 131 return (0); 132 } 133 134 if (e->e_cmd == ELF_C_READ) { 135 LIBELF_SET_ERROR(MODE, 0); 136 return (0); 137 } 138 139 if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL) 140 return (0); 141 142 (void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY); 143 144 if (ec == ELFCLASS64) { 145 eh64 = (Elf64_Ehdr *) ehdr; 146 *eh64 = *s; 147 return (1); 148 } 149 150 eh32 = (Elf32_Ehdr *) ehdr; 151 152 (void) memcpy(eh32->e_ident, s->e_ident, sizeof(eh32->e_ident)); 153 154 eh32->e_type = s->e_type; 155 eh32->e_machine = s->e_machine; 156 eh32->e_version = s->e_version; 157 LIBELF_COPY_U32(eh32, s, e_entry); 158 LIBELF_COPY_U32(eh32, s, e_phoff); 159 LIBELF_COPY_U32(eh32, s, e_shoff); 160 eh32->e_flags = s->e_flags; 161 eh32->e_ehsize = s->e_ehsize; 162 eh32->e_phentsize = s->e_phentsize; 163 eh32->e_phnum = s->e_phnum; 164 eh32->e_shentsize = s->e_shentsize; 165 eh32->e_shnum = s->e_shnum; 166 eh32->e_shstrndx = s->e_shstrndx; 167 168 return (1); 169 } 170