1  /* BFD back-end for i386 a.out binaries.
       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  
      22  /* The only 386 aout system we have here is GO32 from DJ.
      23     These numbers make BFD work with that. If your aout 386 system
      24     doesn't work with these, we'll have to split them into different
      25     files.  Send me (sac@cygnus.com) the runes to make it work on your
      26     system, and I'll stick it in for the next release.  */
      27  
      28  #define N_HEADER_IN_TEXT(x)	0
      29  #define N_TXTOFF(x)		0x20
      30  #define N_TXTADDR(x)		(N_MAGIC (x) == ZMAGIC ? 0x1020 : 0)
      31  #define N_TXTSIZE(x)		((x)->a_text)
      32  #define TARGET_PAGE_SIZE	4096
      33  #define SEGMENT_SIZE		0x400000
      34  #define DEFAULT_ARCH		bfd_arch_i386
      35  
      36  /* Do not "beautify" the CONCAT* macro args.  Traditional C will not
      37     remove whitespace added here, and thus will fail to concatenate
      38     the tokens.  */
      39  #define MY(OP) CONCAT2 (i386_aout_,OP)
      40  #define TARGETNAME "a.out-i386"
      41  
      42  #include "sysdep.h"
      43  #include "bfd.h"
      44  #include "libbfd.h"
      45  #include "aout/aout64.h"
      46  #include "libaout.h"
      47  
      48  /* Set the machine type correctly.  */
      49  
      50  static bool
      51  i386aout_write_object_contents (bfd *abfd)
      52  {
      53    struct external_exec exec_bytes;
      54    struct internal_exec *execp = exec_hdr (abfd);
      55  
      56    N_SET_MACHTYPE (execp, M_386);
      57  
      58    obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;
      59  
      60    WRITE_HEADERS (abfd, execp);
      61  
      62    return true;
      63  }
      64  
      65  #define MY_write_object_contents  i386aout_write_object_contents
      66  #define MY_backend_data		  & MY (backend_data)
      67  
      68  static const struct aout_backend_data MY (backend_data);
      69  
      70  #include "aout-target.h"
      71  
      72  static const struct aout_backend_data MY (backend_data) =
      73  {
      74    0,				/* Zmagic contiguous.  */
      75    1,				/* Text incl header.  */
      76    0,				/* Entry is text address.  */
      77    0,				/* Exec_hdr_flags.  */
      78    0,				/* Text vma?  */
      79    MY (set_sizes),
      80    1,				/* Exec header not counted.  */
      81    0,				/* Add_dynamic_symbols.  */
      82    0,				/* Add_one_symbol.  */
      83    0,				/* Link_dynamic_object.  */
      84    0,				/* Write_dynamic_symbol.  */
      85    0,				/* Check_dynamic_reloc.  */
      86    0				/* Finish_dynamic_link.  */
      87  };