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d87bef3a7b
The newer update-copyright.py fixes file encoding too, removing cr/lf on binutils/bfdtest2.c and ld/testsuite/ld-cygwin/exe-export.exp, and embedded cr in binutils/testsuite/binutils-all/ar.exp string match.
326 lines
10 KiB
C
326 lines
10 KiB
C
/* BFD back-end for MS-DOS executables.
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Copyright (C) 1990-2023 Free Software Foundation, Inc.
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Written by Bryan Ford of the University of Utah.
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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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#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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#include "coff/msdos.h"
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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 bool
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msdos_mkobject (bfd *abfd)
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{
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bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i8086);
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return aout_32_mkobject (abfd);
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}
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static bfd_cleanup
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msdos_object_p (bfd *abfd)
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{
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struct external_DOS_hdr hdr;
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bfd_byte buffer[2];
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asection *section;
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bfd_size_type size;
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if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
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|| (size = bfd_bread (&hdr, sizeof (hdr), abfd)) + 1 < DOS_HDR_SIZE + 1)
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{
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if (bfd_get_error () != bfd_error_system_call)
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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if (H_GET_16 (abfd, hdr.e_magic) != IMAGE_DOS_SIGNATURE)
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{
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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/* Check that this isn't actually a PE, NE, or LE file. If it is, the
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e_lfanew field will be valid and point to a header beginning with one of
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the relevant signatures. If not, e_lfanew might point to anything, so
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don't bail if we can't read there. */
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if (size < offsetof (struct external_DOS_hdr, e_lfanew) + 4
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|| H_GET_16 (abfd, hdr.e_cparhdr) < 4)
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;
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else if (bfd_seek (abfd, H_GET_32 (abfd, hdr.e_lfanew), SEEK_SET) != 0
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|| bfd_bread (buffer, (bfd_size_type) 2, abfd) != 2)
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{
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if (bfd_get_error () == bfd_error_system_call)
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return NULL;
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}
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else
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{
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if (H_GET_16 (abfd, buffer) == IMAGE_NT_SIGNATURE
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|| H_GET_16 (abfd, buffer) == IMAGE_OS2_SIGNATURE
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|| H_GET_16 (abfd, buffer) == IMAGE_OS2_SIGNATURE_LE
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|| H_GET_16 (abfd, buffer) == IMAGE_OS2_SIGNATURE_LX)
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{
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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}
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if (!msdos_mkobject (abfd))
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return NULL;
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abfd->flags = EXEC_P;
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abfd->start_address = H_GET_16 (abfd, hdr.e_ip);
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section = bfd_make_section (abfd, ".text");
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if (section == NULL)
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return NULL;
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section->flags = (SEC_ALLOC | SEC_LOAD | SEC_CODE | SEC_HAS_CONTENTS);
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section->filepos = H_GET_16 (abfd, hdr.e_cparhdr) * 16;
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size = (H_GET_16 (abfd, hdr.e_cp) - 1) * EXE_PAGE_SIZE - section->filepos;
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size += H_GET_16 (abfd, hdr.e_cblp);
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/* Check that the size is valid. */
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if (bfd_seek (abfd, section->filepos + size, SEEK_SET) != 0)
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{
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if (bfd_get_error () != bfd_error_system_call)
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bfd_set_error (bfd_error_wrong_format);
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return NULL;
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}
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bfd_set_section_size (section, size);
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section->alignment_power = 4;
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return _bfd_no_cleanup;
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}
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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 bool
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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_section_flags (sec) & SEC_ALLOC)
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{
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bfd_vma sec_vma = bfd_section_vma (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_section_flags (sec) & SEC_LOAD)
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{
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file_ptr sec_end = (sizeof (hdr)
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+ bfd_section_vma (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, IMAGE_DOS_SIGNATURE, &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 bool
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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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if (count == 0)
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return true;
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section->filepos = EXE_PAGE_SIZE + bfd_section_vma (section);
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if (bfd_section_flags (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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#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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#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_lookup_section_flags bfd_generic_lookup_section_flags
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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_group_name bfd_generic_group_name
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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_define_common_symbol bfd_generic_define_common_symbol
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#define msdos_bfd_link_hide_symbol _bfd_generic_link_hide_symbol
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#define msdos_bfd_define_start_stop bfd_generic_define_start_stop
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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_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_copy_link_hash_symbol_type \
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_bfd_generic_copy_link_hash_symbol_type
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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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#define msdos_bfd_link_check_relocs _bfd_generic_link_check_relocs
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#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_get_symbol_version_string \
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_bfd_nosymbols_get_symbol_version_string
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#define msdos_find_nearest_line _bfd_nosymbols_find_nearest_line
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#define msdos_find_nearest_line_with_alt _bfd_nosymbols_find_nearest_line_with_alt
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#define msdos_find_line _bfd_nosymbols_find_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_bool_bfd_asymbol_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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#define msdos_canonicalize_reloc _bfd_norelocs_canonicalize_reloc
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#define msdos_set_reloc _bfd_norelocs_set_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
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const bfd_target i386_msdos_vec =
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{
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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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0, /* match priority. */
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TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */
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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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{
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_bfd_dummy_target,
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msdos_object_p, /* bfd_check_format */
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_bfd_dummy_target,
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_bfd_dummy_target,
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},
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{
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_bfd_bool_bfd_false_error,
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msdos_mkobject,
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_bfd_generic_mkarchive,
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_bfd_bool_bfd_false_error,
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},
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{ /* bfd_write_contents */
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_bfd_bool_bfd_false_error,
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msdos_write_object_contents,
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_bfd_write_archive_contents,
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_bfd_bool_bfd_false_error,
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},
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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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NULL,
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NULL
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};
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