bfd/i386aout.c

   1 /* BFD back-end for i386 a.out binaries.
   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 #define PAGE_SIZE       4096
  21 #define SEGMENT_SIZE    PAGE_SIZE
  22 #define TEXT_START_ADDR 0x8000
  23 #define ARCH 32
  24 #define BYTES_IN_WORD 4
  25
  26 #include "bfd.h"
  27 #include "sysdep.h"
  28 #include "libbfd.h"
  29 #include "aout64.h"
  30 #include "stab.gnu.h"
  31 #include "ar.h"
  32 #include "libaout.h"           /* BFD a.out internal data structures */
  33
  34 bfd_target *aout386_callback ();
  35
  36 bfd_target *
  37 DEFUN(aout386_object_p,(abfd),
  38      bfd *abfd)
  39 {
  40   struct external_exec exec_bytes;
  41   struct internal_exec exec;
  42
  43   if (bfd_read ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd)
  44       != EXEC_BYTES_SIZE) {
  45     bfd_error = wrong_format;
  46     return 0;
  47   }
  48
  49   exec.a_info = bfd_h_get_32 (abfd, exec_bytes.e_info);
  50
  51   if (N_BADMAG (exec)) return 0;
  52
  53   NAME(aout,swap_exec_header_in)(abfd, &exec_bytes, &exec);
  54   return aout_32_some_aout_object_p (abfd, &exec, aout386_callback);
  55 }
  56
  57 /* Finish up the reading of the file header */
  58 bfd_target *
  59 DEFUN(aout386_callback,(abfd),
  60       bfd *abfd)
  61 {
  62   struct internal_exec *execp = exec_hdr (abfd);
  63
  64   WORK_OUT_FILE_POSITIONS(abfd, execp) ;
  65
  66   /* Determine the architecture and machine type of the object file.  */
  67   bfd_default_set_arch_mach(abfd, bfd_arch_i386, 0);
  68
  69   return abfd->xvec;
  70 }
  71
  72 /* Write an object file.
  73    Section contents have already been written.  We write the
  74    file header, symbols, and relocation.  */
  75
  76 boolean
  77 DEFUN(aout386_write_object_contents,(abfd),
  78       bfd *abfd)
  79 {
  80   bfd_size_type data_pad = 0;
  81   struct external_exec exec_bytes;
  82   struct internal_exec *execp = exec_hdr (abfd);
  83
  84   WRITE_HEADERS(abfd, execp);
  85   return true;
  86 }
  87 \f
  88 /* Transfer vector */
  89
  90 /* We use BSD archive files.  */
  91 #define aout386_openr_next_archived_file        bfd_generic_openr_next_archived_file
  92 #define aout386_generic_stat_arch_elt   bfd_generic_stat_arch_elt
  93 #define aout386_slurp_armap             bfd_slurp_bsd_armap
  94 #define aout386_slurp_extended_name_table       bfd_true
  95 #define aout386_write_armap             bsd_write_armap
  96 #define aout386_truncate_arname         bfd_bsd_truncate_arname
  97
  98 /* We don't support core files here.  */
  99 #define aout386_core_file_failing_command _bfd_dummy_core_file_failing_command
 100 #define aout386_core_file_failing_signal _bfd_dummy_core_file_failing_signal
 101 #define aout386_core_file_matches_executable_p  \
 102                                 _bfd_dummy_core_file_matches_executable_p
 103 #define aout386_core_file_p             _bfd_dummy_target
 104
 105 #define aout386_bfd_debug_info_start            bfd_void
 106 #define aout386_bfd_debug_info_end              bfd_void
 107 #define aout386_bfd_debug_info_accumulate       (PROTO(void,(*),(bfd*, struct sec *))) bfd_void
 108
 109 #define aout386_mkobject                aout_32_mkobject
 110 #define aout386_close_and_cleanup       aout_32_close_and_cleanup
 111 #define aout386_set_section_contents    aout_32_set_section_contents
 112 #define aout386_get_section_contents    aout_32_get_section_contents
 113 #define aout386_new_section_hook        aout_32_new_section_hook
 114 #define aout386_get_symtab_upper_bound  aout_32_get_symtab_upper_bound
 115 #define aout386_get_symtab              aout_32_get_symtab
 116 #define aout386_get_reloc_upper_bound   aout_32_get_reloc_upper_bound
 117 #define aout386_canonicalize_reloc      aout_32_canonicalize_reloc
 118 #define aout386_make_empty_symbol       aout_32_make_empty_symbol
 119 #define aout386_print_symbol            aout_32_print_symbol
 120 #define aout386_get_lineno              aout_32_get_lineno
 121 #define aout386_set_arch_mach           aout_32_set_arch_mach
 122 #define aout386_find_nearest_line       aout_32_find_nearest_line
 123 #define aout386_sizeof_headers          aout_32_sizeof_headers
 124
 125 bfd_target i386aout_vec =       /* Intel 386 running a.out, embedded. */
 126 {
 127   "a.out-i386",                 /* name */
 128   bfd_target_aout_flavour,
 129   false,                        /* target byte order */
 130   false,                        /* target headers byte order */
 131   (HAS_RELOC | EXEC_P |         /* object flags */
 132    HAS_LINENO | HAS_DEBUG |
 133    HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
 134   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 135   ' ',                          /* ar_pad_char */
 136   16,                           /* ar_max_namelen */
 137   1,                            /* minimum alignment */
 138                                 /* data swap routines */
 139   _do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putl16,
 140                                 /* header swap routines */
 141   _do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putl16,
 142
 143   {_bfd_dummy_target, aout386_object_p, /* bfd_check_format */
 144      bfd_generic_archive_p, aout386_core_file_p},
 145   {bfd_false, aout386_mkobject, /* bfd_set_format */
 146      _bfd_generic_mkarchive, bfd_false},
 147   {bfd_false, aout386_write_object_contents, /* bfd_write_contents */
 148      _bfd_write_archive_contents, bfd_false},
 149
 150   JUMP_TABLE(aout386)
 151 };