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. |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 3 | This file is part of Red Hat elfutils. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 4 | Written by Ulrich Drepper <drepper@redhat.com>, 1998. |
| 5 | |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 6 | Red Hat elfutils is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by the |
| 8 | Free Software Foundation; version 2 of the License. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 9 | |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 10 | Red Hat elfutils is distributed in the hope that it will be useful, but |
| 11 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | General Public License for more details. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 14 | |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 15 | You should have received a copy of the GNU General Public License along |
| 16 | with Red Hat elfutils; if not, write to the Free Software Foundation, |
Ulrich Drepper | 1e9ef50 | 2006-04-04 22:29:06 +0000 | [diff] [blame] | 17 | Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 18 | |
| 19 | In addition, as a special exception, Red Hat, Inc. gives You the |
| 20 | additional right to link the code of Red Hat elfutils with code licensed |
| 21 | under any Open Source Initiative certified open source license |
| 22 | (http://www.opensource.org/licenses/index.php) which requires the |
| 23 | distribution of source code with any binary distribution and to |
| 24 | distribute linked combinations of the two. Non-GPL Code permitted under |
| 25 | this exception must only link to the code of Red Hat elfutils through |
| 26 | those well defined interfaces identified in the file named EXCEPTION |
| 27 | found in the source code files (the "Approved Interfaces"). The files |
| 28 | of Non-GPL Code may instantiate templates or use macros or inline |
| 29 | functions from the Approved Interfaces without causing the resulting |
| 30 | work to be covered by the GNU General Public License. Only Red Hat, |
| 31 | Inc. may make changes or additions to the list of Approved Interfaces. |
| 32 | Red Hat's grant of this exception is conditioned upon your not adding |
| 33 | any new exceptions. If you wish to add a new Approved Interface or |
| 34 | exception, please contact Red Hat. You must obey the GNU General Public |
| 35 | License in all respects for all of the Red Hat elfutils code and other |
| 36 | code used in conjunction with Red Hat elfutils except the Non-GPL Code |
| 37 | covered by this exception. If you modify this file, you may extend this |
| 38 | exception to your version of the file, but you are not obligated to do |
| 39 | so. If you do not wish to provide this exception without modification, |
| 40 | you must delete this exception statement from your version and license |
| 41 | this file solely under the GPL without exception. |
| 42 | |
| 43 | Red Hat elfutils is an included package of the Open Invention Network. |
| 44 | An included package of the Open Invention Network is a package for which |
| 45 | Open Invention Network licensees cross-license their patents. No patent |
| 46 | license is granted, either expressly or impliedly, by designation as an |
| 47 | included package. Should you wish to participate in the Open Invention |
| 48 | Network licensing program, please visit www.openinventionnetwork.com |
| 49 | <http://www.openinventionnetwork.com>. */ |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 50 | |
| 51 | #ifdef HAVE_CONFIG_H |
| 52 | # include <config.h> |
| 53 | #endif |
| 54 | |
| 55 | #include <libelf.h> |
| 56 | #include <stddef.h> |
| 57 | |
| 58 | #include "libelfP.h" |
| 59 | |
| 60 | #ifndef LIBELFBITS |
| 61 | # define LIBELFBITS 32 |
| 62 | #endif |
| 63 | |
| 64 | |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 65 | static ElfW2(LIBELFBITS,Ehdr) * |
| 66 | getehdr_impl (elf, wrlock) |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 67 | Elf *elf; |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 68 | int wrlock; |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 69 | { |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 70 | if (elf == NULL) |
| 71 | return NULL; |
| 72 | |
| 73 | if (unlikely (elf->kind != ELF_K_ELF)) |
| 74 | { |
| 75 | __libelf_seterrno (ELF_E_INVALID_HANDLE); |
| 76 | return NULL; |
| 77 | } |
| 78 | |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 79 | again: |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 80 | if (elf->class == 0) |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 81 | { |
| 82 | if (!wrlock) |
| 83 | { |
| 84 | rwlock_unlock (elf->lock); |
| 85 | rwlock_wrlock (elf->lock); |
| 86 | wrlock = 1; |
| 87 | goto again; |
| 88 | } |
| 89 | elf->class = ELFW(ELFCLASS,LIBELFBITS); |
| 90 | } |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 91 | else if (unlikely (elf->class != ELFW(ELFCLASS,LIBELFBITS))) |
| 92 | { |
| 93 | __libelf_seterrno (ELF_E_INVALID_CLASS); |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 94 | return NULL; |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 95 | } |
| 96 | |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 97 | return elf->state.ELFW(elf,LIBELFBITS).ehdr; |
| 98 | } |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 99 | |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 100 | ElfW2(LIBELFBITS,Ehdr) * |
| 101 | __elfw2(LIBELFBITS,getehdr_wrlock) (elf) |
| 102 | Elf *elf; |
| 103 | { |
| 104 | return getehdr_impl (elf, 1); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 105 | } |
Ulrich Drepper | d56e232 | 2008-08-16 03:09:13 +0000 | [diff] [blame] | 106 | |
| 107 | ElfW2(LIBELFBITS,Ehdr) * |
| 108 | elfw2(LIBELFBITS,getehdr) (elf) |
| 109 | Elf *elf; |
| 110 | { |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 111 | ElfW2(LIBELFBITS,Ehdr) *result; |
Ulrich Drepper | d56e232 | 2008-08-16 03:09:13 +0000 | [diff] [blame] | 112 | if (elf == NULL) |
| 113 | return NULL; |
| 114 | |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 115 | rwlock_rdlock (elf->lock); |
Ulrich Drepper | 02f6645 | 2008-12-04 05:58:16 +0000 | [diff] [blame] | 116 | result = getehdr_impl (elf, 0); |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 117 | rwlock_unlock (elf->lock); |
| 118 | |
| 119 | return result; |
Ulrich Drepper | d56e232 | 2008-08-16 03:09:13 +0000 | [diff] [blame] | 120 | } |