1 /* msdos.h - MS-DOS and derived executable header information
3 Copyright (C) 1999-2018 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software Foundation,
19 Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
23 #define IMAGE_DOS_SIGNATURE 0x5a4d /* MZ */
24 #define IMAGE_OS2_SIGNATURE 0x454e /* NE */
25 #define IMAGE_OS2_SIGNATURE_LE 0x454c /* LE */
26 #define IMAGE_OS2_SIGNATURE_LX 0x584c /* LX */
27 #define IMAGE_NT_SIGNATURE 0x00004550 /* PE\0\0 */
29 struct external_DOS_hdr
31 /* DOS header fields - always at offset zero in the EXE file. */
32 char e_magic[2]; /* Magic number. */
33 char e_cblp[2]; /* Bytes on last page of file. */
34 char e_cp[2]; /* Pages in file. */
35 char e_crlc[2]; /* Relocations. */
36 char e_cparhdr[2]; /* Size of header in paragraphs. */
37 char e_minalloc[2]; /* Minimum extra paragraphs needed. */
38 char e_maxalloc[2]; /* Maximum extra paragraphs needed. */
39 char e_ss[2]; /* Initial (relative) SS value. */
40 char e_sp[2]; /* Initial SP value. */
41 char e_csum[2]; /* Checksum. */
42 char e_ip[2]; /* Initial IP value. */
43 char e_cs[2]; /* Initial (relative) CS value. */
44 char e_lfarlc[2]; /* File address of relocation table. */
45 char e_ovno[2]; /* Overlay number. */
46 char e_res[4][2]; /* Reserved words, all 0x0. */
47 char e_oemid[2]; /* OEM identifier. */
48 char e_oeminfo[2]; /* OEM information. */
49 char e_res2[10][2]; /* Reserved words, all 0x0. */
50 char e_lfanew[4]; /* File address of new exe header, usually 0x80. */
51 char dos_message[16][4]; /* Other stuff, always follow DOS header. */
54 /* The actual DOS header only includes up to the e_ovno field. */
55 #define DOS_HDR_SIZE (offsetof (struct external_DOS_hdr, e_res))