tools/reorder/elf_utils.cpp

   1 /* ***** BEGIN LICENSE BLOCK *****
   2  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   3  *
   4  * The contents of this file are subject to the Mozilla Public License Version
   5  * 1.1 (the "License"); you may not use this file except in compliance with
   6  * the License. You may obtain a copy of the License at
   7  * http://www.mozilla.org/MPL/
   8  *
   9  * Software distributed under the License is distributed on an "AS IS" basis,
  10  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  11  * for the specific language governing rights and limitations under the
  12  * License.
  13  *
  14  * The Original Code is ``elf_symbol_table''
  15  *
  16  * The Initial Developer of the Original Code is Netscape
  17  * Communications Corp.  Portions created by the Initial Developer are
  18  * Copyright (C) 2001 the Initial Developer. All Rights Reserved.
  19  *
  20  * Contributor(s):
  21  *   Chris Waterson <waterson@netscape.com>
  22  *
  23  * Alternatively, the contents of this file may be used under the terms of
  24  * either the GNU General Public License Version 2 or later (the "GPL"), or
  25  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  26  * in which case the provisions of the GPL or the LGPL are applicable instead
  27  * of those above. If you wish to allow use of your version of this file only
  28  * under the terms of either the GPL or the LGPL, and not to allow others to
  29  * use your version of this file under the terms of the MPL, indicate your
  30  * decision by deleting the provisions above and replace them with the notice
  31  * and other provisions required by the GPL or the LGPL. If you do not delete
  32  * the provisions above, a recipient may use your version of this file under
  33  * the terms of any one of the MPL, the GPL or the LGPL.
  34  *
  35  * ***** END LICENSE BLOCK ***** */
  36
  37 #include <fstream>
  38 #include "elf_utils.h"
  39
  40 int
  41 elf_verify_header(const Elf32_Ehdr *hdr)
  42 {
  43     if (hdr->e_ident[EI_MAG0] != ELFMAG0
  44         || hdr->e_ident[EI_MAG1] != ELFMAG1
  45         || hdr->e_ident[EI_MAG2] != ELFMAG2
  46         || hdr->e_ident[EI_MAG3] != ELFMAG3) {
  47         cerr << "not an elf file" << endl;
  48         return -1;
  49     }
  50
  51     if (hdr->e_ident[EI_CLASS] != ELFCLASS32) {
  52         cerr << "not a 32-bit elf file" << endl;
  53         return -1;
  54     }
  55
  56     if (hdr->e_ident[EI_DATA] != ELFDATA2LSB) {
  57         cerr << "not a little endian elf file" << endl;
  58         return -1;
  59     }
  60
  61     if (hdr->e_ident[EI_VERSION] != EV_CURRENT) {
  62         cerr << "incompatible version" << endl;
  63         return -1;
  64     }
  65
  66     return 0;
  67 }
  68