diff options
Diffstat (limited to 'binutils-2.25/bfd/i386msdos.c')
| -rw-r--r-- | binutils-2.25/bfd/i386msdos.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/i386msdos.c b/binutils-2.25/bfd/i386msdos.c new file mode 100644 index 00000000..ed7d8961 --- /dev/null +++ b/binutils-2.25/bfd/i386msdos.c @@ -0,0 +1,235 @@ +/* BFD back-end for MS-DOS executables. + Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2002, + 2003, 2004, 2005, 2006, 2007, 2009, 2011, 2012 + Free Software Foundation, Inc. + Written by Bryan Ford of the University of Utah. + + Contributed by the Center for Software Science at the + University of Utah (pa-gdb-bugs@cs.utah.edu). + + This file is part of BFD, the Binary File Descriptor library. + + 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 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + 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., 51 Franklin Street - Fifth Floor, Boston, + MA 02110-1301, USA. */ + + +#include "sysdep.h" +#include "bfd.h" +#include "libbfd.h" +#include "libaout.h" + +#define EXE_MAGIC 0x5a4d +#define EXE_LOAD_HIGH 0x0000 +#define EXE_LOAD_LOW 0xffff +#define EXE_PAGE_SIZE 512 + +static int +msdos_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED, + struct bfd_link_info *info ATTRIBUTE_UNUSED) +{ + return 0; +} + +static bfd_boolean +msdos_write_object_contents (bfd *abfd) +{ + static char hdr[EXE_PAGE_SIZE]; + file_ptr outfile_size = sizeof(hdr); + bfd_vma high_vma = 0; + asection *sec; + + /* Find the total size of the program on disk and in memory. */ + 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; + 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) + + sec->size); + if (sec_end > outfile_size) + outfile_size = sec_end; + } + } + + /* Make sure the program isn't too big. */ + if (high_vma > (bfd_vma)0xffff) + { + bfd_set_error(bfd_error_file_too_big); + return FALSE; + } + + /* Constants. */ + H_PUT_16 (abfd, EXE_MAGIC, &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). */ + H_PUT_16 (abfd, outfile_size & (EXE_PAGE_SIZE - 1), &hdr[2]); + + /* 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. */ + H_PUT_16 (abfd, high_vma, &hdr[16]); + + if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 + || bfd_bwrite (hdr, (bfd_size_type) sizeof(hdr), abfd) != sizeof(hdr)) + return FALSE; + + return TRUE; +} + +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; + + section->filepos = EXE_PAGE_SIZE + bfd_get_section_vma (abfd, section); + + if (bfd_get_section_flags (abfd, section) & SEC_LOAD) + { + if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0 + || 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_close_and_cleanup _bfd_generic_close_and_cleanup +#define msdos_bfd_free_cached_info _bfd_generic_bfd_free_cached_info +#define msdos_new_section_hook _bfd_generic_new_section_hook +#define msdos_get_section_contents _bfd_generic_get_section_contents +#define msdos_get_section_contents_in_window \ + _bfd_generic_get_section_contents_in_window +#define msdos_bfd_get_relocated_section_contents \ + 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_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_hash_table_create _bfd_generic_link_hash_table_create +#define msdos_bfd_link_hash_table_free _bfd_generic_link_hash_table_free +#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_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound +#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_find_nearest_line _bfd_nosymbols_find_nearest_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_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_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 */ + 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, + _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), + + NULL, + + NULL + }; + + |