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 <assert.h> 28 #include <gelf.h> 29 #include <libelf.h> 30 #include <limits.h> 31 #include <stdint.h> 32 #include <string.h> 33 34 #include "_libelf.h" 35 36 ELFTC_VCSID("$Id: gelf_ehdr.c 3177 2015-03-30 18:19:41Z emaste $"); 37 38 Elf32_Ehdr * 39 elf32_getehdr(Elf *e) 40 { 41 return (_libelf_ehdr(e, ELFCLASS32, 0)); 42 } 43 44 Elf64_Ehdr * 45 elf64_getehdr(Elf *e) 46 { 47 return (_libelf_ehdr(e, ELFCLASS64, 0)); 48 } 49 50 GElf_Ehdr * 51 gelf_getehdr(Elf *e, GElf_Ehdr *d) 52 { 53 int ec; 54 Elf32_Ehdr *eh32; 55 Elf64_Ehdr *eh64; 56 57 if (d == NULL || e == NULL || 58 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) { 59 LIBELF_SET_ERROR(ARGUMENT, 0); 60 return (NULL); 61 } 62 63 if (ec == ELFCLASS32) { 64 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL) 65 return (NULL); 66 67 (void) memcpy(d->e_ident, eh32->e_ident, 68 sizeof(eh32->e_ident)); 69 d->e_type = eh32->e_type; 70 d->e_machine = eh32->e_machine; 71 d->e_version = eh32->e_version; 72 d->e_entry = eh32->e_entry; 73 d->e_phoff = eh32->e_phoff; 74 d->e_shoff = eh32->e_shoff; 75 d->e_flags = eh32->e_flags; 76 d->e_ehsize = eh32->e_ehsize; 77 d->e_phentsize = eh32->e_phentsize; 78 d->e_phnum = eh32->e_phnum; 79 d->e_shentsize = eh32->e_shentsize; 80 d->e_shnum = eh32->e_shnum; 81 d->e_shstrndx = eh32->e_shstrndx; 82 83 return (d); 84 } 85 86 assert(ec == ELFCLASS64); 87 88 if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL) 89 return (NULL); 90 *d = *eh64; 91 92 return (d); 93 } 94 95 Elf32_Ehdr * 96 elf32_newehdr(Elf *e) 97 { 98 return (_libelf_ehdr(e, ELFCLASS32, 1)); 99 } 100 101 Elf64_Ehdr * 102 elf64_newehdr(Elf *e) 103 { 104 return (_libelf_ehdr(e, ELFCLASS64, 1)); 105 } 106 107 void * 108 gelf_newehdr(Elf *e, int ec) 109 { 110 if (e != NULL && 111 (ec == ELFCLASS32 || ec == ELFCLASS64)) 112 return (_libelf_ehdr(e, ec, 1)); 113 114 LIBELF_SET_ERROR(ARGUMENT, 0); 115 return (NULL); 116 } 117 118 int 119 gelf_update_ehdr(Elf *e, GElf_Ehdr *s) 120 { 121 int ec; 122 void *ehdr; 123 Elf32_Ehdr *eh32; 124 Elf64_Ehdr *eh64; 125 126 if (s== NULL || e == NULL || e->e_kind != ELF_K_ELF || 127 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) { 128 LIBELF_SET_ERROR(ARGUMENT, 0); 129 return (0); 130 } 131 132 if (e->e_cmd == ELF_C_READ) { 133 LIBELF_SET_ERROR(MODE, 0); 134 return (0); 135 } 136 137 if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL) 138 return (0); 139 140 (void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY); 141 142 if (ec == ELFCLASS64) { 143 eh64 = (Elf64_Ehdr *) ehdr; 144 *eh64 = *s; 145 return (1); 146 } 147 148 eh32 = (Elf32_Ehdr *) ehdr; 149 150 (void) memcpy(eh32->e_ident, s->e_ident, sizeof(eh32->e_ident)); 151 152 eh32->e_type = s->e_type; 153 eh32->e_machine = s->e_machine; 154 eh32->e_version = s->e_version; 155 LIBELF_COPY_U32(eh32, s, e_entry); 156 LIBELF_COPY_U32(eh32, s, e_phoff); 157 LIBELF_COPY_U32(eh32, s, e_shoff); 158 eh32->e_flags = s->e_flags; 159 eh32->e_ehsize = s->e_ehsize; 160 eh32->e_phentsize = s->e_phentsize; 161 eh32->e_phnum = s->e_phnum; 162 eh32->e_shentsize = s->e_shentsize; 163 eh32->e_shnum = s->e_shnum; 164 eh32->e_shstrndx = s->e_shstrndx; 165 166 return (1); 167 } 168