bfd/i386aout.c

   1 /* BFD back-end for i386 a.out binaries.
   2    Copyright (C) 1990-2021 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 };