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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.18.50/] [bfd/] [i386msdos.c] - Blame information for rev 156

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1 38 julius
/* BFD back-end for MS-DOS executables.
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   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2002,
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   2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
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   Written by Bryan Ford of the University of Utah.
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6
   Contributed by the Center for Software Science at the
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   University of Utah (pa-gdb-bugs@cs.utah.edu).
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   This file is part of BFD, the Binary File Descriptor library.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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   MA 02110-1301, USA.  */
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26
 
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#include "sysdep.h"
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#include "bfd.h"
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#include "libbfd.h"
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#include "libaout.h"
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#define EXE_MAGIC       0x5a4d
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#define EXE_LOAD_HIGH   0x0000
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#define EXE_LOAD_LOW    0xffff
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#define EXE_PAGE_SIZE   512
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static int
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msdos_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED,
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                      struct bfd_link_info *info ATTRIBUTE_UNUSED)
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{
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  return 0;
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}
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static bfd_boolean
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msdos_write_object_contents (bfd *abfd)
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{
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  static char hdr[EXE_PAGE_SIZE];
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  file_ptr outfile_size = sizeof(hdr);
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  bfd_vma high_vma = 0;
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  asection *sec;
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  /* Find the total size of the program on disk and in memory.  */
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  for (sec = abfd->sections; sec != (asection *) NULL; sec = sec->next)
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    {
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      if (sec->size == 0)
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        continue;
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      if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
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        {
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          bfd_vma sec_vma = bfd_get_section_vma (abfd, sec) + sec->size;
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          if (sec_vma > high_vma)
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            high_vma = sec_vma;
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        }
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      if (bfd_get_section_flags (abfd, sec) & SEC_LOAD)
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        {
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          file_ptr sec_end = (sizeof (hdr)
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                              + bfd_get_section_vma (abfd, sec)
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                              + sec->size);
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          if (sec_end > outfile_size)
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            outfile_size = sec_end;
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        }
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    }
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  /* Make sure the program isn't too big.  */
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  if (high_vma > (bfd_vma)0xffff)
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    {
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      bfd_set_error(bfd_error_file_too_big);
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      return FALSE;
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    }
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  /* Constants.  */
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  H_PUT_16 (abfd, EXE_MAGIC, &hdr[0]);
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  H_PUT_16 (abfd, EXE_PAGE_SIZE / 16, &hdr[8]);
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  H_PUT_16 (abfd, EXE_LOAD_LOW, &hdr[12]);
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  H_PUT_16 (abfd, 0x3e, &hdr[24]);
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  H_PUT_16 (abfd, 0x0001, &hdr[28]); /* XXX??? */
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  H_PUT_16 (abfd, 0x30fb, &hdr[30]); /* XXX??? */
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  H_PUT_16 (abfd, 0x726a, &hdr[32]); /* XXX??? */
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  /* Bytes in last page (0 = full page).  */
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  H_PUT_16 (abfd, outfile_size & (EXE_PAGE_SIZE - 1), &hdr[2]);
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  /* Number of pages.  */
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  H_PUT_16 (abfd, (outfile_size + EXE_PAGE_SIZE - 1) / EXE_PAGE_SIZE, &hdr[4]);
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  /* Set the initial stack pointer to the end of the bss.
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     The program's crt0 code must relocate it to a real stack.  */
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  H_PUT_16 (abfd, high_vma, &hdr[16]);
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  if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
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      || bfd_bwrite (hdr, (bfd_size_type) sizeof(hdr), abfd) != sizeof(hdr))
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    return FALSE;
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  return TRUE;
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}
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static bfd_boolean
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msdos_set_section_contents (bfd *abfd,
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                            sec_ptr section,
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                            const void *location,
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                            file_ptr offset,
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                            bfd_size_type count)
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{
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114
  if (count == 0)
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    return TRUE;
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  section->filepos = EXE_PAGE_SIZE + bfd_get_section_vma (abfd, section);
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  if (bfd_get_section_flags (abfd, section) & SEC_LOAD)
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    {
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      if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0
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          || bfd_bwrite (location, count, abfd) != count)
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        return FALSE;
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    }
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  return TRUE;
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}
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129
 
130
 
131
#define msdos_mkobject aout_32_mkobject
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#define msdos_make_empty_symbol aout_32_make_empty_symbol
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#define msdos_bfd_reloc_type_lookup aout_32_reloc_type_lookup
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#define msdos_bfd_reloc_name_lookup aout_32_reloc_name_lookup
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136
#define msdos_close_and_cleanup _bfd_generic_close_and_cleanup
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#define msdos_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
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#define msdos_new_section_hook _bfd_generic_new_section_hook
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#define msdos_get_section_contents _bfd_generic_get_section_contents
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#define msdos_get_section_contents_in_window \
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  _bfd_generic_get_section_contents_in_window
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#define msdos_bfd_get_relocated_section_contents \
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  bfd_generic_get_relocated_section_contents
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#define msdos_bfd_relax_section bfd_generic_relax_section
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#define msdos_bfd_gc_sections bfd_generic_gc_sections
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#define msdos_bfd_merge_sections bfd_generic_merge_sections
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#define msdos_bfd_is_group_section bfd_generic_is_group_section
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#define msdos_bfd_discard_group bfd_generic_discard_group
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#define msdos_section_already_linked \
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  _bfd_generic_section_already_linked
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#define msdos_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
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#define msdos_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
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#define msdos_bfd_link_add_symbols _bfd_generic_link_add_symbols
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#define msdos_bfd_link_just_syms _bfd_generic_link_just_syms
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#define msdos_bfd_final_link _bfd_generic_final_link
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#define msdos_bfd_link_split_section _bfd_generic_link_split_section
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#define msdos_set_arch_mach _bfd_generic_set_arch_mach
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159
#define msdos_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
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#define msdos_canonicalize_symtab _bfd_nosymbols_canonicalize_symtab
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#define msdos_print_symbol _bfd_nosymbols_print_symbol
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#define msdos_get_symbol_info _bfd_nosymbols_get_symbol_info
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#define msdos_find_nearest_line _bfd_nosymbols_find_nearest_line
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#define msdos_find_inliner_info _bfd_nosymbols_find_inliner_info
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#define msdos_get_lineno _bfd_nosymbols_get_lineno
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#define msdos_bfd_is_target_special_symbol ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)
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#define msdos_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
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#define msdos_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
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#define msdos_read_minisymbols _bfd_nosymbols_read_minisymbols
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#define msdos_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
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172
#define msdos_canonicalize_reloc _bfd_norelocs_canonicalize_reloc
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#define msdos_get_reloc_upper_bound _bfd_norelocs_get_reloc_upper_bound
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#define msdos_32_bfd_link_split_section  _bfd_generic_link_split_section
175
 
176
const bfd_target i386msdos_vec =
177
  {
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    "msdos",                    /* name */
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    bfd_target_msdos_flavour,
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    BFD_ENDIAN_LITTLE,          /* target byte order */
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    BFD_ENDIAN_LITTLE,          /* target headers byte order */
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    (EXEC_P),                   /* object flags */
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    (SEC_CODE | SEC_DATA | SEC_HAS_CONTENTS
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     | SEC_ALLOC | SEC_LOAD),   /* section flags */
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    0,                           /* leading underscore */
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    ' ',                                /* ar_pad_char */
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    16,                         /* ar_max_namelen */
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    bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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    bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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    bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
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    bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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    bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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    bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
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195
    {
196
      _bfd_dummy_target,
197
      _bfd_dummy_target,                /* bfd_check_format */
198
      _bfd_dummy_target,
199
      _bfd_dummy_target,
200
    },
201
    {
202
      bfd_false,
203
      msdos_mkobject,
204
      _bfd_generic_mkarchive,
205
      bfd_false,
206
    },
207
    {                           /* bfd_write_contents */
208
      bfd_false,
209
      msdos_write_object_contents,
210
      _bfd_write_archive_contents,
211
      bfd_false,
212
    },
213
 
214
    BFD_JUMP_TABLE_GENERIC (msdos),
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    BFD_JUMP_TABLE_COPY (_bfd_generic),
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    BFD_JUMP_TABLE_CORE (_bfd_nocore),
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    BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
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    BFD_JUMP_TABLE_SYMBOLS (msdos),
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    BFD_JUMP_TABLE_RELOCS (msdos),
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    BFD_JUMP_TABLE_WRITE (msdos),
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    BFD_JUMP_TABLE_LINK (msdos),
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    BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
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224
    NULL,
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226
    (PTR) 0
227
  };
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