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 } 117