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 <ansidecl.h>
  27 #include <sysdep.h>
  28 #include "bfd.h"
  29 #include "libbfd.h"
  30 #include "aout64.h"
  31
  32 /**From: bothner@cs.wisc.edu***********************************************/
  33 #undef N_TXTOFF
  34 #define N_TXTOFF(x)   ( (N_MAGIC((x)) == ZMAGIC) ? PAGE_SIZE : EXEC_BYTES_SIZE)
  35 /**************************************************************************/
  36
  37 #include "stab.gnu.h"
  38 #include "ar.h"
  39 #include "libaout.h"           /* BFD a.out internal data structures */
  40
  41 bfd_target *aout386_callback ();
  42
  43 bfd_target *
  44 DEFUN(aout386_object_p,(abfd),
  45      bfd *abfd)
  46 {
  47   struct external_exec exec_bytes;
  48   struct internal_exec exec;
  49
  50   if (bfd_read ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd)
  51       != EXEC_BYTES_SIZE) {
  52     bfd_error = wrong_format;
  53     return 0;
  54   }
  55
  56   exec.a_info = bfd_h_get_32 (abfd, exec_bytes.e_info);
  57
  58   if (N_BADMAG (exec)) return 0;
  59
  60   NAME(aout,swap_exec_header_in)(abfd, &exec_bytes, &exec);
  61   return aout_32_some_aout_object_p (abfd, &exec, aout386_callback);
  62 }
  63
  64 /* Finish up the reading of the file header */
  65 bfd_target *
  66 DEFUN(aout386_callback,(abfd),
  67       bfd *abfd)
  68 {
  69   struct internal_exec *execp = exec_hdr (abfd);
  70
  71   WORK_OUT_FILE_POSITIONS(abfd, execp) ;
  72
  73   /* Determine the architecture and machine type of the object file.  */
  74   bfd_default_set_arch_mach(abfd, bfd_arch_i386, 0);
  75
  76   return abfd->xvec;
  77 }
  78
  79 /* Write an object file.
  80    Section contents have already been written.  We write the
  81    file header, symbols, and relocation.  */
  82
  83 boolean
  84 DEFUN(aout386_write_object_contents,(abfd),
  85       bfd *abfd)
  86 {
  87   bfd_size_type data_pad = 0;
  88   struct external_exec exec_bytes;
  89   struct internal_exec *execp = exec_hdr (abfd);
  90
  91   WRITE_HEADERS(abfd, execp);
  92   return true;
  93 }
  94 \f
  95 /* Transfer vector */
  96
  97 /* We use BSD archive files.  */
  98 #define aout386_openr_next_archived_file        bfd_generic_openr_next_archived_file
  99 #define aout386_generic_stat_arch_elt   bfd_generic_stat_arch_elt
 100 #define aout386_slurp_armap             bfd_slurp_bsd_armap
 101 #define aout386_slurp_extended_name_table       bfd_true
 102 #define aout386_write_armap             bsd_write_armap
 103 #define aout386_truncate_arname         bfd_bsd_truncate_arname
 104
 105 /* We don't support core files here.  */
 106 #define aout386_core_file_failing_command _bfd_dummy_core_file_failing_command
 107 #define aout386_core_file_failing_signal _bfd_dummy_core_file_failing_signal
 108 #define aout386_core_file_matches_executable_p  \
 109                                 _bfd_dummy_core_file_matches_executable_p
 110 #define aout386_core_file_p             _bfd_dummy_target
 111
 112 #define aout386_bfd_debug_info_start            bfd_void
 113 #define aout386_bfd_debug_info_end              bfd_void
 114 #define aout386_bfd_debug_info_accumulate       (PROTO(void,(*),(bfd*, struct sec *))) bfd_void
 115
 116 #define aout386_mkobject                aout_32_mkobject
 117 #define aout386_close_and_cleanup       aout_32_close_and_cleanup
 118 #define aout386_set_section_contents    aout_32_set_section_contents
 119 #define aout386_get_section_contents    aout_32_get_section_contents
 120 #define aout386_new_section_hook        aout_32_new_section_hook
 121 #define aout386_get_symtab_upper_bound  aout_32_get_symtab_upper_bound
 122 #define aout386_get_symtab              aout_32_get_symtab
 123 #define aout386_get_reloc_upper_bound   aout_32_get_reloc_upper_bound
 124 #define aout386_canonicalize_reloc      aout_32_canonicalize_reloc
 125 #define aout386_make_empty_symbol       aout_32_make_empty_symbol
 126 #define aout386_print_symbol            aout_32_print_symbol
 127 #define aout386_get_lineno              aout_32_get_lineno
 128 #define aout386_set_arch_mach           aout_32_set_arch_mach
 129 #define aout386_find_nearest_line       aout_32_find_nearest_line
 130 #define aout386_sizeof_headers          aout_32_sizeof_headers
 131
 132 bfd_target i386aout_vec =       /* Intel 386 running a.out, embedded. */
 133 {
 134   "a.out-i386",                 /* name */
 135   bfd_target_aout_flavour,
 136   false,                        /* target byte order */
 137   false,                        /* target headers byte order */
 138   (HAS_RELOC | EXEC_P |         /* object flags */
 139    HAS_LINENO | HAS_DEBUG |
 140    HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT | D_PAGED),
 141   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 142   ' ',                          /* ar_pad_char */
 143   16,                           /* ar_max_namelen */
 144   1,                            /* minimum alignment */
 145                                 /* data swap routines */
 146   _do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putl16,
 147                                 /* header swap routines */
 148   _do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putl16,
 149
 150   {_bfd_dummy_target, aout386_object_p, /* bfd_check_format */
 151      bfd_generic_archive_p, aout386_core_file_p},
 152   {bfd_false, aout386_mkobject, /* bfd_set_format */
 153      _bfd_generic_mkarchive, bfd_false},
 154   {bfd_false, aout386_write_object_contents, /* bfd_write_contents */
 155      _bfd_write_archive_contents, bfd_false},
 156
 157   JUMP_TABLE(aout386)
 158 };