bfd/gen-aout.c

   1 /* Generate parameters for an a.out system.
   2    Copyright (C) 1990-2023 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #include "/usr/include/a.out.h"
  22 #include <stdio.h>
  23
  24 #ifndef _
  25 #define _(X) X
  26 #endif
  27
  28 int
  29 main (int argc, char** argv)
  30 {
  31   struct exec my_exec;
  32   int page_size;
  33   char * target;
  34   char * arch = "unknown";
  35   FILE * file;
  36
  37   target = argv[1];
  38   if (target == NULL)
  39     {
  40       fprintf (stderr, "Usage: gen-aout target_name\n");
  41       exit (1);
  42     }
  43
  44   file = fopen ("gen-aout", "r");
  45   if (file == NULL)
  46     {
  47       fprintf (stderr, "Cannot open gen-aout!\n");
  48       return -1;
  49     }
  50
  51   if (fread (&my_exec, sizeof (struct exec), 1, file) != 1)
  52     {
  53       fprintf(stderr, "Cannot read gen-aout!\n");
  54       return -1;
  55     }
  56
  57   fclose (file);
  58
  59 #ifdef N_TXTOFF
  60   page_size = N_TXTOFF (&my_exec);
  61   if (page_size == 0)
  62     printf ("#define N_HEADER_IN_TEXT(x) 1\n");
  63   else
  64     printf ("#define N_HEADER_IN_TEXT(x) 0\n");
  65 #endif
  66
  67   printf("#define BYTES_IN_WORD %d\n", sizeof (int));
  68   if (my_exec.a_entry == 0)
  69     {
  70       printf ("#define ENTRY_CAN_BE_ZERO\n");
  71       printf ("#define N_SHARED_LIB(x) 0 /* Avoids warning */\n");
  72     }
  73   else
  74     {
  75       printf ("/*#define ENTRY_CAN_BE_ZERO*/\n");
  76       printf ("/*#define N_SHARED_LIB(x) 0*/\n");
  77     }
  78
  79   printf ("#define TEXT_START_ADDR %d\n", my_exec.a_entry);
  80
  81 #ifdef PAGSIZ
  82   if (page_size == 0)
  83     page_size = PAGSIZ;
  84 #endif
  85
  86   if (page_size != 0)
  87     printf ("#define TARGET_PAGE_SIZE %d\n", page_size);
  88   else
  89     printf ("/* #define TARGET_PAGE_SIZE ??? */\n");
  90
  91   printf ("#define SEGMENT_SIZE TARGET_PAGE_SIZE\n");
  92
  93 #ifdef vax
  94   arch = "vax";
  95 #endif
  96   if (arch[0] == '1')
  97     {
  98       fprintf (stderr, _("warning: preprocessor substituted architecture name inside string;"));
  99       fprintf (stderr, _("         fix DEFAULT_ARCH in the output file yourself\n"));
 100       arch = "unknown";
 101     }
 102   printf ("#define DEFAULT_ARCH bfd_arch_%s\n\n", arch);
 103
 104   printf ("/* Do not \"beautify\" the CONCAT* macro args.  Traditional C will not");
 105   printf ("   remove whitespace added here, and thus will fail to concatenate");
 106   printf ("   the tokens.  */");
 107   printf ("\n#define MY(OP) CONCAT2 (%s_,OP)\n\n", target);
 108   printf ("#define TARGETNAME \"a.out-%s\"\n\n", target);
 109
 110   printf ("#include \"sysdep.h\"\n");
 111   printf ("#include \"bfd.h\"\n");
 112   printf ("#include \"libbfd.h\"\n");
 113   printf ("#include \"libaout.h\"\n");
 114   printf ("\n#include \"aout-target.h\"\n");
 115
 116   return 0;
 117 }