include/coff/msdos.h

   1 /* msdos.h  -  MS-DOS and derived executable header information
   2
   3    Copyright (C) 1999-2021 Free Software Foundation, Inc.
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   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.
  11
  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.
  16
  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.  */
  20 #ifndef _MSDOS_H
  21 #define _MSDOS_H
  22
  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 */
  28
  29 struct external_DOS_hdr
  30 {
  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.  */
  52 };
  53
  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))
  56
  57 #endif /* _MSDOS_H */