| /* BFD back-end for MS-DOS executables. |
| Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999 |
| 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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| |
| |
| #include "bfd.h" |
| #include "sysdep.h" |
| #include "libbfd.h" |
| #include "libaout.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 int |
| msdos_sizeof_headers (abfd, exec) |
| bfd *abfd ATTRIBUTE_UNUSED; |
| boolean exec ATTRIBUTE_UNUSED; |
| { |
| return 0; |
| } |
| |
| static boolean |
| msdos_write_object_contents (abfd) |
| 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 (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_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 (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 */ |
| 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??? */ |
| |
| /* bytes in last page (0 = full page) */ |
| bfd_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]); |
| |
| /* 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]); |
| |
| if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 |
| || bfd_write (hdr, 1, sizeof(hdr), abfd) != sizeof(hdr)) |
| return false; |
| |
| 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; |
| { |
| |
| 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, (file_ptr) (section->filepos + offset), SEEK_SET) != 0 |
| || bfd_write (location, 1, 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_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_link_hash_table_create _bfd_generic_link_hash_table_create |
| #define msdos_bfd_link_add_symbols _bfd_generic_link_add_symbols |
| #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_get_symtab _bfd_nosymbols_get_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_get_lineno _bfd_nosymbols_get_lineno |
| #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 */ |
| 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, |
| |
| (PTR) 0 |
| }; |
| |
| |
