gen-aout.c

早期freebsd实现

/* Generate parameters for an a.out system.
   Copyright (C) 1990-1991 Free Software Foundation, Inc.

This file is part of BFD, the Binary File Descriptor library.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "/usr/include/a.out.h"
#include <stdio.h>

/* Stuffed value of "ABCD" in a long, followed by a 0. */
long int str[2] = { 0x41424344, 0x0 };

int
main (argc, argv)
     int argc; char** argv;
{
  struct exec my_exec;
  int page_size;
  char *target;
  FILE *file = fopen("gen-aout", "r");
  if (file == NULL) {
      fprintf(stderr, "Cannot open gen-aout!\n");
      return -1;
  }
  if (fread(&my_exec, sizeof(struct exec), 1, file) != 1) {
      fprintf(stderr, "Cannot read gen-aout!\n");
      return -1;
  }

  target = argv[1];
  if (target == NULL) {
      fprintf(stderr, "Usage: gen-aout target_name\n");
      exit (-1);
  }

  if (strcmp ((char *)&str[0], "ABCD") == 0)
    printf("#define TARGET_IS_BIG_ENDIAN_P\n");
  else
    printf("#define TARGET_IS_LITTLE_ENDIAN_P\n");

#ifdef N_TXTOFF
  page_size = N_TXTOFF(my_exec);
  if (page_size == 0)
    printf("#define N_HEADER_IN_TEXT(x) 1\n");
  else
    printf("#define N_HEADER_IN_TEXT(x) 0\n");
#endif

  printf("#define BYTES_IN_WORD 4\n");
  printf("#define ARCH 32\n");
  if (my_exec.a_entry == 0) {
      printf("#define ENTRY_CAN_BE_ZERO\n");
      printf("#define N_SHARED_LIB(x) 0 /* Avoids warning */\n");
  }
  else {
      printf("/*#define ENTRY_CAN_BE_ZERO*/\n");
      printf("/*#define N_SHARED_LIB(x) 0\n*/");
  }

  printf("#define TEXT_START_ADDR %d\n", my_exec.a_entry);

#ifdef PAGSIZ
  if (page_size == 0)
    page_size = PAGSIZ;
#endif
  if (page_size != 0)
    printf("#define PAGE_SIZE %d\n", page_size);
  else
    printf("/* #define PAGE_SIZE ??? */\n");
  printf("#define SEGMENT_SIZE PAGE_SIZE\n");

  printf("#define DEFAULT_ARCH bfd_arch_m68k\n");

  printf("\n#define MY(OP) CAT(%s_,OP)\n", target);
  printf("#define TARGETNAME \"a.out-%s\"\n\n", target);

  printf("#include \"bfd.h\"\n");
  printf("#include \"sysdep.h\"\n");
  printf("#include \"libbfd.h\"\n");
  printf("#include \"libaout.h\"\n");
  printf("\n#include \"aout-target.h\"\n");

  return 0;
}