Roland McGrath | 6fd3cd1 | 2010-01-07 19:41:04 -0800 | [diff] [blame] | 1 | /* Return number of program headers in the ELF file. |
| 2 | Copyright (C) 2010 Red Hat, Inc. |
| 3 | This file is part of Red Hat elfutils. |
| 4 | |
| 5 | Red Hat elfutils is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by the |
| 7 | Free Software Foundation; version 2 of the License. |
| 8 | |
| 9 | Red Hat elfutils is distributed in the hope that it will be useful, but |
| 10 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU General Public License along |
| 15 | with Red Hat elfutils; if not, write to the Free Software Foundation, |
| 16 | Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. |
| 17 | |
| 18 | In addition, as a special exception, Red Hat, Inc. gives You the |
| 19 | additional right to link the code of Red Hat elfutils with code licensed |
| 20 | under any Open Source Initiative certified open source license |
| 21 | (http://www.opensource.org/licenses/index.php) which requires the |
| 22 | distribution of source code with any binary distribution and to |
| 23 | distribute linked combinations of the two. Non-GPL Code permitted under |
| 24 | this exception must only link to the code of Red Hat elfutils through |
| 25 | those well defined interfaces identified in the file named EXCEPTION |
| 26 | found in the source code files (the "Approved Interfaces"). The files |
| 27 | of Non-GPL Code may instantiate templates or use macros or inline |
| 28 | functions from the Approved Interfaces without causing the resulting |
| 29 | work to be covered by the GNU General Public License. Only Red Hat, |
| 30 | Inc. may make changes or additions to the list of Approved Interfaces. |
| 31 | Red Hat's grant of this exception is conditioned upon your not adding |
| 32 | any new exceptions. If you wish to add a new Approved Interface or |
| 33 | exception, please contact Red Hat. You must obey the GNU General Public |
| 34 | License in all respects for all of the Red Hat elfutils code and other |
| 35 | code used in conjunction with Red Hat elfutils except the Non-GPL Code |
| 36 | covered by this exception. If you modify this file, you may extend this |
| 37 | exception to your version of the file, but you are not obligated to do |
| 38 | so. If you do not wish to provide this exception without modification, |
| 39 | you must delete this exception statement from your version and license |
| 40 | this file solely under the GPL without exception. |
| 41 | |
| 42 | Red Hat elfutils is an included package of the Open Invention Network. |
| 43 | An included package of the Open Invention Network is a package for which |
| 44 | Open Invention Network licensees cross-license their patents. No patent |
| 45 | license is granted, either expressly or impliedly, by designation as an |
| 46 | included package. Should you wish to participate in the Open Invention |
| 47 | Network licensing program, please visit www.openinventionnetwork.com |
| 48 | <http://www.openinventionnetwork.com>. */ |
| 49 | |
| 50 | #ifdef HAVE_CONFIG_H |
| 51 | # include <config.h> |
| 52 | #endif |
| 53 | |
| 54 | #include <assert.h> |
| 55 | #include <gelf.h> |
| 56 | #include <stddef.h> |
| 57 | |
| 58 | #include "libelfP.h" |
| 59 | |
| 60 | |
| 61 | int |
| 62 | __elf_getphdrnum_rdlock (elf, dst) |
| 63 | Elf *elf; |
| 64 | size_t *dst; |
| 65 | { |
| 66 | if (unlikely (elf->state.elf64.ehdr == NULL)) |
| 67 | { |
| 68 | /* Maybe no ELF header was created yet. */ |
| 69 | __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR); |
| 70 | return -1; |
| 71 | } |
| 72 | |
| 73 | *dst = (elf->class == ELFCLASS32 |
| 74 | ? elf->state.elf32.ehdr->e_phnum |
| 75 | : elf->state.elf64.ehdr->e_phnum); |
| 76 | |
| 77 | if (*dst == PN_XNUM) |
| 78 | { |
| 79 | const Elf_ScnList *const scns = (elf->class == ELFCLASS32 |
| 80 | ? &elf->state.elf32.scns |
| 81 | : &elf->state.elf64.scns); |
| 82 | |
| 83 | /* If there are no section headers, perhaps this is really just 65536 |
| 84 | written without PN_XNUM support. Either that or it's bad data. */ |
| 85 | |
| 86 | if (likely (scns->cnt > 0)) |
| 87 | *dst = (elf->class == ELFCLASS32 |
| 88 | ? scns->data[0].shdr.e32->sh_info |
| 89 | : scns->data[0].shdr.e64->sh_info); |
| 90 | } |
| 91 | |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | int |
| 96 | elf_getphdrnum (elf, dst) |
| 97 | Elf *elf; |
| 98 | size_t *dst; |
| 99 | { |
| 100 | int result; |
| 101 | |
| 102 | if (elf == NULL) |
| 103 | return -1; |
| 104 | |
| 105 | if (unlikely (elf->kind != ELF_K_ELF)) |
| 106 | { |
| 107 | __libelf_seterrno (ELF_E_INVALID_HANDLE); |
| 108 | return -1; |
| 109 | } |
| 110 | |
| 111 | rwlock_rdlock (elf->lock); |
| 112 | result = __elf_getphdrnum_rdlock (elf, dst); |
| 113 | rwlock_unlock (elf->lock); |
| 114 | |
| 115 | return result; |
| 116 | } |