1 /* Get ELF header. 2 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2005, 2015 Red Hat, Inc. 3 This file is part of elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 1998. 5 6 This file is free software; you can redistribute it and/or modify 7 it under the terms of either 8 9 * the GNU Lesser General Public License as published by the Free 10 Software Foundation; either version 3 of the License, or (at 11 your option) any later version 12 13 or 14 15 * the GNU General Public License as published by the Free 16 Software Foundation; either version 2 of the License, or (at 17 your option) any later version 18 19 or both in parallel, as here. 20 21 elfutils is distributed in the hope that it will be useful, but 22 WITHOUT ANY WARRANTY; without even the implied warranty of 23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24 General Public License for more details. 25 26 You should have received copies of the GNU General Public License and 27 the GNU Lesser General Public License along with this program. If 28 not, see <http://www.gnu.org/licenses/>. */ 29 30 #ifdef HAVE_CONFIG_H 31 # include <config.h> 32 #endif 33 34 #include <gelf.h> 35 #include <stddef.h> 36 #include <stdlib.h> 37 #include <string.h> 38 39 #include "libelfP.h" 40 41 42 GElf_Ehdr * 43 internal_function 44 __gelf_getehdr_rdlock (Elf *elf, GElf_Ehdr *dest) 45 { 46 GElf_Ehdr *result = NULL; 47 48 if (elf == NULL) 49 return NULL; 50 51 if (unlikely (elf->kind != ELF_K_ELF)) 52 { 53 __libelf_seterrno (ELF_E_INVALID_HANDLE); 54 return NULL; 55 } 56 57 /* The following is an optimization: the ehdr element is at the same 58 position in both the elf32 and elf64 structure. */ 59 if (offsetof (struct Elf, state.elf32.ehdr) 60 != offsetof (struct Elf, state.elf64.ehdr)) 61 abort (); 62 /* Just pick one of the values. */ 63 if (unlikely (elf->state.elf64.ehdr == NULL)) 64 /* Maybe no ELF header was created yet. */ 65 __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR); 66 else if (elf->class == ELFCLASS32) 67 { 68 Elf32_Ehdr *ehdr = elf->state.elf32.ehdr; 69 70 /* Convert the 32-bit struct to an 64-bit one. */ 71 memcpy (dest->e_ident, ehdr->e_ident, EI_NIDENT); 72 #define COPY(name) \ 73 dest->name = ehdr->name 74 COPY (e_type); 75 COPY (e_machine); 76 COPY (e_version); 77 COPY (e_entry); 78 COPY (e_phoff); 79 COPY (e_shoff); 80 COPY (e_flags); 81 COPY (e_ehsize); 82 COPY (e_phentsize); 83 COPY (e_phnum); 84 COPY (e_shentsize); 85 COPY (e_shnum); 86 COPY (e_shstrndx); 87 88 result = dest; 89 } 90 else 91 result = memcpy (dest, elf->state.elf64.ehdr, sizeof (*dest)); 92 93 return result; 94 } 95 96 GElf_Ehdr * 97 gelf_getehdr (Elf *elf, GElf_Ehdr *dest) 98 { 99 GElf_Ehdr *result; 100 if (elf == NULL) 101 return NULL; 102 103 rwlock_rdlock (elf->lock); 104 result = __gelf_getehdr_rdlock (elf, dest); 105 rwlock_unlock (elf->lock); 106 107 return result; 108 } 109
