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