/* BFD back-end for MS-DOS executables.
- Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 98, 1999
- 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
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+ MA 02110-1301, USA. */
-#include "bfd.h"
#include "sysdep.h"
+#include "bfd.h"
#include "libbfd.h"
#include "libaout.h"
+#include "coff/msdos.h"
-#if 0
-struct exe_header
-{
- unsigned short magic;
- unsigned short bytes_in_last_page;
- unsigned short npages; /* number of 512-byte "pages" including this header */
- unsigned short nrelocs;
- unsigned short header_paras; /* number of 16-byte paragraphs in header */
- unsigned short reserved;
- unsigned short load_switch;
- unsigned short ss_ofs;
- unsigned short sp;
- unsigned short checksum;
- unsigned short ip;
- unsigned short cs_ofs;
- unsigned short reloc_ofs;
- unsigned short reserved2;
- unsigned short something1;
- unsigned short something2;
- unsigned short something3;
-};
-#endif
-
-#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 (abfd, exec)
- bfd *abfd ATTRIBUTE_UNUSED;
- boolean exec ATTRIBUTE_UNUSED;
+msdos_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED,
+ struct bfd_link_info *info ATTRIBUTE_UNUSED)
{
return 0;
}
-static boolean
-msdos_write_object_contents (abfd)
- bfd *abfd;
+static bfd_boolean
+msdos_write_object_contents (bfd *abfd)
{
static char hdr[EXE_PAGE_SIZE];
file_ptr outfile_size = sizeof(hdr);
/* Find the total size of the program on disk and in memory. */
for (sec = abfd->sections; sec != (asection *) NULL; sec = sec->next)
{
- if (bfd_get_section_size_before_reloc (sec) == 0)
- continue;
- if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
- {
- bfd_vma sec_vma = bfd_get_section_vma (abfd, sec)
- + bfd_get_section_size_before_reloc (sec);
+ if (sec->size == 0)
+ 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)
- {
- file_ptr sec_end = sizeof(hdr)
- + bfd_get_section_vma (abfd, sec)
- + bfd_get_section_size_before_reloc (sec);
+ if (bfd_section_flags (sec) & SEC_LOAD)
+ {
+ file_ptr sec_end = (sizeof (hdr)
+ + bfd_section_vma (sec)
+ + sec->size);
if (sec_end > outfile_size)
outfile_size = sec_end;
}
if (high_vma > (bfd_vma)0xffff)
{
bfd_set_error(bfd_error_file_too_big);
- return false;
+ return FALSE;
}
- /* constants */
- bfd_h_put_16(abfd, EXE_MAGIC, &hdr[0]);
- bfd_h_put_16(abfd, EXE_PAGE_SIZE / 16, &hdr[8]);
- bfd_h_put_16(abfd, EXE_LOAD_LOW, &hdr[12]);
- bfd_h_put_16(abfd, 0x3e, &hdr[24]);
- bfd_h_put_16(abfd, 0x0001, &hdr[28]); /* XXX??? */
- bfd_h_put_16(abfd, 0x30fb, &hdr[30]); /* XXX??? */
- bfd_h_put_16(abfd, 0x726a, &hdr[32]); /* XXX??? */
+ /* Constants. */
+ 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]);
+ H_PUT_16 (abfd, 0x0001, &hdr[28]); /* XXX??? */
+ H_PUT_16 (abfd, 0x30fb, &hdr[30]); /* XXX??? */
+ H_PUT_16 (abfd, 0x726a, &hdr[32]); /* XXX??? */
- /* bytes in last page (0 = full page) */
- bfd_h_put_16(abfd, outfile_size & (EXE_PAGE_SIZE - 1), &hdr[2]);
+ /* Bytes in last page (0 = full page). */
+ H_PUT_16 (abfd, outfile_size & (EXE_PAGE_SIZE - 1), &hdr[2]);
- /* number of pages */
- bfd_h_put_16(abfd, (outfile_size + EXE_PAGE_SIZE - 1) / EXE_PAGE_SIZE,
- &hdr[4]);
+ /* Number of pages. */
+ H_PUT_16 (abfd, (outfile_size + EXE_PAGE_SIZE - 1) / EXE_PAGE_SIZE, &hdr[4]);
/* Set the initial stack pointer to the end of the bss.
The program's crt0 code must relocate it to a real stack. */
- bfd_h_put_16(abfd, high_vma, &hdr[16]);
+ H_PUT_16 (abfd, high_vma, &hdr[16]);
if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
- || bfd_write (hdr, 1, sizeof(hdr), abfd) != sizeof(hdr))
- return false;
+ || bfd_bwrite (hdr, (bfd_size_type) sizeof(hdr), abfd) != sizeof(hdr))
+ return FALSE;
- return true;
+ return TRUE;
}
-static boolean
-msdos_set_section_contents (abfd, section, location, offset, count)
- bfd *abfd;
- sec_ptr section;
- PTR location;
- file_ptr offset;
- bfd_size_type count;
+static bfd_boolean
+msdos_set_section_contents (bfd *abfd,
+ sec_ptr section,
+ const void *location,
+ file_ptr offset,
+ bfd_size_type count)
{
if (count == 0)
- return true;
+ 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, (file_ptr) (section->filepos + offset), SEEK_SET) != 0
- || bfd_write (location, 1, count, abfd) != count)
- return false;
+ if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0
+ || bfd_bwrite (location, count, abfd) != count)
+ return FALSE;
}
- return true;
+ 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_close_and_cleanup _bfd_generic_close_and_cleanup
#define msdos_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
bfd_generic_get_relocated_section_contents
#define msdos_bfd_relax_section bfd_generic_relax_section
#define msdos_bfd_gc_sections bfd_generic_gc_sections
+#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_bfd_copy_link_hash_symbol_type \
+ _bfd_generic_copy_link_hash_symbol_type
#define msdos_bfd_final_link _bfd_generic_final_link
#define msdos_bfd_link_split_section _bfd_generic_link_split_section
#define msdos_set_arch_mach _bfd_generic_set_arch_mach
+#define msdos_bfd_link_check_relocs _bfd_generic_link_check_relocs
#define msdos_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
-#define msdos_get_symtab _bfd_nosymbols_get_symtab
+#define msdos_canonicalize_symtab _bfd_nosymbols_canonicalize_symtab
#define msdos_print_symbol _bfd_nosymbols_print_symbol
#define msdos_get_symbol_info _bfd_nosymbols_get_symbol_info
+#define msdos_get_symbol_version_string \
+ _bfd_nosymbols_get_symbol_version_string
#define msdos_find_nearest_line _bfd_nosymbols_find_nearest_line
+#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_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
#define msdos_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
#define msdos_canonicalize_reloc _bfd_norelocs_canonicalize_reloc
+#define msdos_set_reloc _bfd_norelocs_set_reloc
#define msdos_get_reloc_upper_bound _bfd_norelocs_get_reloc_upper_bound
#define msdos_32_bfd_link_split_section _bfd_generic_link_split_section
-const bfd_target i386msdos_vec =
-{
- "msdos", /* name */
- bfd_target_msdos_flavour,
- BFD_ENDIAN_LITTLE, /* target byte order */
- BFD_ENDIAN_LITTLE, /* target headers byte order */
- (EXEC_P), /* object flags */
- (SEC_CODE | SEC_DATA | SEC_HAS_CONTENTS
- | SEC_ALLOC | SEC_LOAD), /* section flags */
- 0, /* leading underscore */
- ' ', /* ar_pad_char */
- 16, /* ar_max_namelen */
- bfd_getl64, bfd_getl_signed_64, bfd_putl64,
- bfd_getl32, bfd_getl_signed_32, bfd_putl32,
- bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
- bfd_getl64, bfd_getl_signed_64, bfd_putl64,
- bfd_getl32, bfd_getl_signed_32, bfd_putl32,
- bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
-
+const bfd_target i386_msdos_vec =
{
- _bfd_dummy_target,
- _bfd_dummy_target, /* bfd_check_format */
- _bfd_dummy_target,
- _bfd_dummy_target,
- },
- {
- bfd_false,
- msdos_mkobject,
- _bfd_generic_mkarchive,
- bfd_false,
- },
- { /* bfd_write_contents */
- bfd_false,
- msdos_write_object_contents,
- _bfd_write_archive_contents,
- bfd_false,
- },
-
- BFD_JUMP_TABLE_GENERIC (msdos),
- BFD_JUMP_TABLE_COPY (_bfd_generic),
- BFD_JUMP_TABLE_CORE (_bfd_nocore),
- BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
- BFD_JUMP_TABLE_SYMBOLS (msdos),
- BFD_JUMP_TABLE_RELOCS (msdos),
- BFD_JUMP_TABLE_WRITE (msdos),
- BFD_JUMP_TABLE_LINK (msdos),
- BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
-
- (PTR) 0
-};
+ "msdos", /* name */
+ bfd_target_msdos_flavour,
+ BFD_ENDIAN_LITTLE, /* target byte order */
+ BFD_ENDIAN_LITTLE, /* target headers byte order */
+ (EXEC_P), /* object flags */
+ (SEC_CODE | SEC_DATA | SEC_HAS_CONTENTS
+ | SEC_ALLOC | SEC_LOAD), /* section flags */
+ 0, /* leading underscore */
+ ' ', /* ar_pad_char */
+ 16, /* ar_max_namelen */
+ 0, /* match priority. */
+ bfd_getl64, bfd_getl_signed_64, bfd_putl64,
+ bfd_getl32, bfd_getl_signed_32, bfd_putl32,
+ bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
+ bfd_getl64, bfd_getl_signed_64, bfd_putl64,
+ bfd_getl32, bfd_getl_signed_32, bfd_putl32,
+ bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
+
+ {
+ _bfd_dummy_target,
+ msdos_object_p, /* bfd_check_format */
+ _bfd_dummy_target,
+ _bfd_dummy_target,
+ },
+ {
+ _bfd_bool_bfd_false_error,
+ msdos_mkobject,
+ _bfd_generic_mkarchive,
+ _bfd_bool_bfd_false_error,
+ },
+ { /* bfd_write_contents */
+ _bfd_bool_bfd_false_error,
+ msdos_write_object_contents,
+ _bfd_write_archive_contents,
+ _bfd_bool_bfd_false_error,
+ },
+
+ BFD_JUMP_TABLE_GENERIC (msdos),
+ BFD_JUMP_TABLE_COPY (_bfd_generic),
+ BFD_JUMP_TABLE_CORE (_bfd_nocore),
+ BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
+ BFD_JUMP_TABLE_SYMBOLS (msdos),
+ BFD_JUMP_TABLE_RELOCS (msdos),
+ BFD_JUMP_TABLE_WRITE (msdos),
+ BFD_JUMP_TABLE_LINK (msdos),
+ BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
+
+ NULL,
+
+ NULL
+ };
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