Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 1 | /* Get ELF header. |
| 2 | Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc. |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 3 | This file is part of elfutils. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 4 | Written by Ulrich Drepper <drepper@redhat.com>, 1998. |
| 5 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 6 | This file is free software; you can redistribute it and/or modify |
| 7 | it under the terms of either |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 8 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 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 |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 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. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 25 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 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/>. */ |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 29 | |
| 30 | #ifdef HAVE_CONFIG_H |
| 31 | # include <config.h> |
| 32 | #endif |
| 33 | |
| 34 | #include <libelf.h> |
| 35 | #include <stddef.h> |
| 36 | |
| 37 | #include "libelfP.h" |
| 38 | |
| 39 | #ifndef LIBELFBITS |
| 40 | # define LIBELFBITS 32 |
| 41 | #endif |
| 42 | |
| 43 | |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 44 | static ElfW2(LIBELFBITS,Ehdr) * |
| 45 | getehdr_impl (elf, wrlock) |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 46 | Elf *elf; |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 47 | int wrlock; |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 48 | { |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 49 | if (elf == NULL) |
| 50 | return NULL; |
| 51 | |
| 52 | if (unlikely (elf->kind != ELF_K_ELF)) |
| 53 | { |
| 54 | __libelf_seterrno (ELF_E_INVALID_HANDLE); |
| 55 | return NULL; |
| 56 | } |
| 57 | |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 58 | again: |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 59 | if (elf->class == 0) |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 60 | { |
| 61 | if (!wrlock) |
| 62 | { |
| 63 | rwlock_unlock (elf->lock); |
| 64 | rwlock_wrlock (elf->lock); |
| 65 | wrlock = 1; |
| 66 | goto again; |
| 67 | } |
| 68 | elf->class = ELFW(ELFCLASS,LIBELFBITS); |
| 69 | } |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 70 | else if (unlikely (elf->class != ELFW(ELFCLASS,LIBELFBITS))) |
| 71 | { |
| 72 | __libelf_seterrno (ELF_E_INVALID_CLASS); |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 73 | return NULL; |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 74 | } |
| 75 | |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 76 | return elf->state.ELFW(elf,LIBELFBITS).ehdr; |
| 77 | } |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 78 | |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 79 | ElfW2(LIBELFBITS,Ehdr) * |
| 80 | __elfw2(LIBELFBITS,getehdr_wrlock) (elf) |
| 81 | Elf *elf; |
| 82 | { |
| 83 | return getehdr_impl (elf, 1); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 84 | } |
Ulrich Drepper | d56e232 | 2008-08-16 03:09:13 +0000 | [diff] [blame] | 85 | |
| 86 | ElfW2(LIBELFBITS,Ehdr) * |
| 87 | elfw2(LIBELFBITS,getehdr) (elf) |
| 88 | Elf *elf; |
| 89 | { |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 90 | ElfW2(LIBELFBITS,Ehdr) *result; |
Ulrich Drepper | d56e232 | 2008-08-16 03:09:13 +0000 | [diff] [blame] | 91 | if (elf == NULL) |
| 92 | return NULL; |
| 93 | |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 94 | rwlock_rdlock (elf->lock); |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 95 | result = getehdr_impl (elf, 0); |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 96 | rwlock_unlock (elf->lock); |
| 97 | |
| 98 | return result; |
Ulrich Drepper | d56e232 | 2008-08-16 03:09:13 +0000 | [diff] [blame] | 99 | } |