/* BFD back-end for MS-DOS executables.
- Copyright (C) 1990-2017 Free Software Foundation, Inc.
+ Copyright (C) 1990-2020 Free Software Foundation, Inc.
Written by Bryan Ford of the University of Utah.
Contributed by the Center for Software Science at the
#include "bfd.h"
#include "libbfd.h"
#include "libaout.h"
+#include "coff/msdos.h"
-#define EXE_MAGIC 0x5a4d
#define EXE_LOAD_HIGH 0x0000
#define EXE_LOAD_LOW 0xffff
#define EXE_PAGE_SIZE 512
+static bfd_boolean
+msdos_mkobject (bfd *abfd)
+{
+ bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i8086);
+
+ return aout_32_mkobject (abfd);
+}
+
+static bfd_cleanup
+msdos_object_p (bfd *abfd)
+{
+ struct external_DOS_hdr hdr;
+ bfd_byte buffer[2];
+ asection *section;
+ bfd_size_type size;
+
+ if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
+ || (size = bfd_bread (&hdr, sizeof (hdr), abfd)) + 1 < DOS_HDR_SIZE + 1)
+ {
+ if (bfd_get_error () != bfd_error_system_call)
+ bfd_set_error (bfd_error_wrong_format);
+ return NULL;
+ }
+
+ if (H_GET_16 (abfd, hdr.e_magic) != IMAGE_DOS_SIGNATURE)
+ {
+ bfd_set_error (bfd_error_wrong_format);
+ return NULL;
+ }
+
+ /* Check that this isn't actually a PE, NE, or LE file. If it is, the
+ e_lfanew field will be valid and point to a header beginning with one of
+ the relevant signatures. If not, e_lfanew might point to anything, so
+ don't bail if we can't read there. */
+ if (size < offsetof (struct external_DOS_hdr, e_lfanew) + 4
+ || H_GET_16 (abfd, hdr.e_cparhdr) < 4)
+ ;
+ else if (bfd_seek (abfd, H_GET_32 (abfd, hdr.e_lfanew), SEEK_SET) != 0
+ || bfd_bread (buffer, (bfd_size_type) 2, abfd) != 2)
+ {
+ if (bfd_get_error () == bfd_error_system_call)
+ return NULL;
+ }
+ else
+ {
+ if (H_GET_16 (abfd, buffer) == IMAGE_NT_SIGNATURE
+ || H_GET_16 (abfd, buffer) == IMAGE_OS2_SIGNATURE
+ || H_GET_16 (abfd, buffer) == IMAGE_OS2_SIGNATURE_LE
+ || H_GET_16 (abfd, buffer) == IMAGE_OS2_SIGNATURE_LX)
+ {
+ bfd_set_error (bfd_error_wrong_format);
+ return NULL;
+ }
+ }
+
+ if (!msdos_mkobject (abfd))
+ return NULL;
+
+ abfd->flags = EXEC_P;
+ abfd->start_address = H_GET_16 (abfd, hdr.e_ip);
+
+ section = bfd_make_section (abfd, ".text");
+ if (section == NULL)
+ return NULL;
+
+ section->flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS);
+ section->filepos = H_GET_16 (abfd, hdr.e_cparhdr) * 16;
+ size = (H_GET_16 (abfd, hdr.e_cp) - 1) * EXE_PAGE_SIZE - section->filepos;
+ size += H_GET_16 (abfd, hdr.e_cblp);
+
+ /* Check that the size is valid. */
+ if (bfd_seek (abfd, section->filepos + size, SEEK_SET) != 0)
+ {
+ if (bfd_get_error () != bfd_error_system_call)
+ bfd_set_error (bfd_error_wrong_format);
+ return NULL;
+ }
+
+ bfd_set_section_size (section, size);
+ section->alignment_power = 4;
+
+ return _bfd_no_cleanup;
+}
+
static int
msdos_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED,
struct bfd_link_info *info ATTRIBUTE_UNUSED)
for (sec = abfd->sections; sec != (asection *) NULL; sec = sec->next)
{
if (sec->size == 0)
- continue;
- if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
- {
- bfd_vma sec_vma = bfd_get_section_vma (abfd, sec) + sec->size;
+ continue;
+ if (bfd_section_flags (sec) & SEC_ALLOC)
+ {
+ bfd_vma sec_vma = bfd_section_vma (sec) + sec->size;
if (sec_vma > high_vma)
high_vma = sec_vma;
}
- if (bfd_get_section_flags (abfd, sec) & SEC_LOAD)
- {
+ if (bfd_section_flags (sec) & SEC_LOAD)
+ {
file_ptr sec_end = (sizeof (hdr)
- + bfd_get_section_vma (abfd, sec)
+ + bfd_section_vma (sec)
+ sec->size);
if (sec_end > outfile_size)
outfile_size = sec_end;
}
/* Constants. */
- H_PUT_16 (abfd, EXE_MAGIC, &hdr[0]);
+ H_PUT_16 (abfd, IMAGE_DOS_SIGNATURE, &hdr[0]);
H_PUT_16 (abfd, EXE_PAGE_SIZE / 16, &hdr[8]);
H_PUT_16 (abfd, EXE_LOAD_LOW, &hdr[12]);
H_PUT_16 (abfd, 0x3e, &hdr[24]);
if (count == 0)
return TRUE;
- section->filepos = EXE_PAGE_SIZE + bfd_get_section_vma (abfd, section);
+ section->filepos = EXE_PAGE_SIZE + bfd_section_vma (section);
- if (bfd_get_section_flags (abfd, section) & SEC_LOAD)
+ if (bfd_section_flags (section) & SEC_LOAD)
{
if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0
- || bfd_bwrite (location, count, abfd) != count)
- return FALSE;
+ || bfd_bwrite (location, count, abfd) != count)
+ return FALSE;
}
return TRUE;
-#define msdos_mkobject aout_32_mkobject
#define msdos_make_empty_symbol aout_32_make_empty_symbol
#define msdos_bfd_reloc_type_lookup aout_32_reloc_type_lookup
#define msdos_bfd_reloc_name_lookup aout_32_reloc_name_lookup
#define msdos_bfd_lookup_section_flags bfd_generic_lookup_section_flags
#define msdos_bfd_merge_sections bfd_generic_merge_sections
#define msdos_bfd_is_group_section bfd_generic_is_group_section
+#define msdos_bfd_group_name bfd_generic_group_name
#define msdos_bfd_discard_group bfd_generic_discard_group
#define msdos_section_already_linked \
_bfd_generic_section_already_linked
#define msdos_bfd_define_common_symbol bfd_generic_define_common_symbol
+#define msdos_bfd_link_hide_symbol _bfd_generic_link_hide_symbol
+#define msdos_bfd_define_start_stop bfd_generic_define_start_stop
#define msdos_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
#define msdos_bfd_link_add_symbols _bfd_generic_link_add_symbols
#define msdos_bfd_link_just_syms _bfd_generic_link_just_syms
#define msdos_find_line _bfd_nosymbols_find_line
#define msdos_find_inliner_info _bfd_nosymbols_find_inliner_info
#define msdos_get_lineno _bfd_nosymbols_get_lineno
-#define msdos_bfd_is_target_special_symbol ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)
+#define msdos_bfd_is_target_special_symbol _bfd_bool_bfd_asymbol_false
#define msdos_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
#define msdos_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
#define msdos_read_minisymbols _bfd_nosymbols_read_minisymbols
{
_bfd_dummy_target,
- _bfd_dummy_target, /* bfd_check_format */
+ msdos_object_p, /* bfd_check_format */
_bfd_dummy_target,
_bfd_dummy_target,
},
{
- bfd_false,
+ _bfd_bool_bfd_false_error,
msdos_mkobject,
_bfd_generic_mkarchive,
- bfd_false,
+ _bfd_bool_bfd_false_error,
},
{ /* bfd_write_contents */
- bfd_false,
+ _bfd_bool_bfd_false_error,
msdos_write_object_contents,
_bfd_write_archive_contents,
- bfd_false,
+ _bfd_bool_bfd_false_error,
},
BFD_JUMP_TABLE_GENERIC (msdos),
projects / deliverable / binutils-gdb.git / blobdiff