1/* $NetBSD: gelf_ehdr.c,v 1.5 2024/03/03 17:37:34 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 <libelf.h> 38#include <limits.h> 39#include <stdint.h> 40#include <string.h> 41 42#include "_libelf.h" 43 44__RCSID("$NetBSD: gelf_ehdr.c,v 1.5 2024/03/03 17:37:34 christos Exp $"); 45ELFTC_VCSID("Id: gelf_ehdr.c 3977 2022-05-01 06:45:34Z jkoshy"); 46 47Elf32_Ehdr * 48elf32_getehdr(Elf *e) 49{ 50 return (_libelf_ehdr(e, ELFCLASS32, 0)); 51} 52 53Elf64_Ehdr * 54elf64_getehdr(Elf *e) 55{ 56 return (_libelf_ehdr(e, ELFCLASS64, 0)); 57} 58 59GElf_Ehdr * 60gelf_getehdr(Elf *e, GElf_Ehdr *d) 61{ 62 int ec; 63 Elf32_Ehdr *eh32; 64 Elf64_Ehdr *eh64; 65 66 if (d == NULL || e == NULL || 67 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) { 68 LIBELF_SET_ERROR(ARGUMENT, 0); 69 return (NULL); 70 } 71 72 if (ec == ELFCLASS32) { 73 if ((eh32 = _libelf_ehdr(e, ELFCLASS32, 0)) == NULL) 74 return (NULL); 75 76 (void) memcpy(d->e_ident, eh32->e_ident, 77 sizeof(eh32->e_ident)); 78 d->e_type = eh32->e_type; 79 d->e_machine = eh32->e_machine; 80 d->e_version = eh32->e_version; 81 d->e_entry = eh32->e_entry; 82 d->e_phoff = eh32->e_phoff; 83 d->e_shoff = eh32->e_shoff; 84 d->e_flags = eh32->e_flags; 85 d->e_ehsize = eh32->e_ehsize; 86 d->e_phentsize = eh32->e_phentsize; 87 d->e_phnum = eh32->e_phnum; 88 d->e_shentsize = eh32->e_shentsize; 89 d->e_shnum = eh32->e_shnum; 90 d->e_shstrndx = eh32->e_shstrndx; 91 92 return (d); 93 } 94 95 assert(ec == ELFCLASS64); 96 97 if ((eh64 = _libelf_ehdr(e, ELFCLASS64, 0)) == NULL) 98 return (NULL); 99 *d = *eh64; 100 101 return (d); 102} 103 104Elf32_Ehdr * 105elf32_newehdr(Elf *e) 106{ 107 return (_libelf_ehdr(e, ELFCLASS32, 1)); 108} 109 110Elf64_Ehdr * 111elf64_newehdr(Elf *e) 112{ 113 return (_libelf_ehdr(e, ELFCLASS64, 1)); 114} 115 116void * 117gelf_newehdr(Elf *e, int ec) 118{ 119 if (e != NULL && 120 (ec == ELFCLASS32 || ec == ELFCLASS64)) 121 return (_libelf_ehdr(e, ec, 1)); 122 123 LIBELF_SET_ERROR(ARGUMENT, 0); 124 return (NULL); 125} 126 127int 128gelf_update_ehdr(Elf *e, GElf_Ehdr *s) 129{ 130 int ec; 131 void *ehdr; 132 Elf32_Ehdr *eh32; 133 Elf64_Ehdr *eh64; 134 135 if (s== NULL || e == NULL || e->e_kind != ELF_K_ELF || 136 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) { 137 LIBELF_SET_ERROR(ARGUMENT, 0); 138 return (0); 139 } 140 141 if (e->e_cmd == ELF_C_READ) { 142 LIBELF_SET_ERROR(MODE, 0); 143 return (0); 144 } 145 146 if ((ehdr = _libelf_ehdr(e, ec, 0)) == NULL) 147 return (0); 148 149 (void) elf_flagehdr(e, ELF_C_SET, ELF_F_DIRTY); 150 151 if (ec == ELFCLASS64) { 152 eh64 = (Elf64_Ehdr *) ehdr; 153 *eh64 = *s; 154 return (1); 155 } 156 157 eh32 = (Elf32_Ehdr *) ehdr; 158 159 (void) memcpy(eh32->e_ident, s->e_ident, sizeof(eh32->e_ident)); 160 161 eh32->e_type = s->e_type; 162 eh32->e_machine = s->e_machine; 163 eh32->e_version = s->e_version; 164 LIBELF_COPY_U32(eh32, s, e_entry); 165 LIBELF_COPY_U32(eh32, s, e_phoff); 166 LIBELF_COPY_U32(eh32, s, e_shoff); 167 eh32->e_flags = s->e_flags; 168 eh32->e_ehsize = s->e_ehsize; 169 eh32->e_phentsize = s->e_phentsize; 170 eh32->e_phnum = s->e_phnum; 171 eh32->e_shentsize = s->e_shentsize; 172 eh32->e_shnum = s->e_shnum; 173 eh32->e_shstrndx = s->e_shstrndx; 174 175 return (1); 176} 177