bfd/gen-aout.c

   1 /* Generate parameters for an a.out system.
   2    Copyright (C) 1990-1991 Free Software Foundation, Inc.
   3
   4 This file is part of BFD, the Binary File Descriptor library.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include "/usr/include/a.out.h"
  21 #include <stdio.h>
  22
  23 /* Stuffed value of "ABCD" in a long, followed by a 0. */
  24 long int str[2] = { 0x41424344, 0x0 };
  25
  26 main ()
  27 {
  28   struct exec my_exec;
  29   int page_size;
  30   FILE *file = fopen("gen-aout", "r");
  31   if (file == NULL) {
  32       fprintf(stderr, "Cannot open gen-aout!\n");
  33       return -1;
  34   }
  35   if (fread(&my_exec, sizeof(struct exec), 1, file) != 1) {
  36       fprintf(stderr, "Cannot read gen-aout!\n");
  37       return -1;
  38   }
  39
  40   if (strcmp ((char *)&str[0], "ABCD") == 0)
  41     printf("#define TARGET_IS_BIG_ENDIAN_P\n");
  42   else
  43     printf("#define TARGET_IS_LITTLE_ENDIAN_P\n");
  44
  45 #ifdef N_TXTOFF
  46   page_size = N_TXTOFF(my_exec);
  47   if (page_size == 0)
  48     printf("#define N_HEADER_IN_TEXT(x) 1\n");
  49   else
  50     printf("#define N_HEADER_IN_TEXT(x) 0\n");
  51 #endif
  52
  53   printf("#define BYTES_IN_WORD 4\n");
  54   printf("#define ARCH 32\n");
  55   if (my_exec.a_entry == 0)
  56       printf("#define ENTRY_CAN_BE_ZERO\n");
  57   printf("#define TEXT_START_ADDR %d\n", my_exec.a_entry);
  58
  59 #ifdef PAGSIZ
  60   if (page_size == 0)
  61     page_size = PAGSIZ;
  62 #endif
  63   if (page_size != 0)
  64     printf("#define PAGE_SIZE %d\n", page_size);
  65
  66   return 0;
  67 }