| 1 | /* BFD back-end for MS-DOS executables.
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| 2 | Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999
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| 3 | Free Software Foundation, Inc.
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| 4 | Written by Bryan Ford of the University of Utah.
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| 5 |
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| 6 | Contributed by the Center for Software Science at the
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| 7 | University of Utah (pa-gdb-bugs@cs.utah.edu).
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| 8 |
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| 9 | This file is part of BFD, the Binary File Descriptor library.
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| 10 |
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| 11 | This program is free software; you can redistribute it and/or modify
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| 12 | it under the terms of the GNU General Public License as published by
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| 13 | the Free Software Foundation; either version 2 of the License, or
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| 14 | (at your option) any later version.
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| 15 |
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| 16 | This program is distributed in the hope that it will be useful,
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| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 19 | GNU General Public License for more details.
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| 20 |
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| 21 | You should have received a copy of the GNU General Public License
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| 22 | along with this program; if not, write to the Free Software
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| 23 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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| 24 |
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| 25 |
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| 26 | #include "bfd.h"
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| 27 | #include "sysdep.h"
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| 28 | #include "libbfd.h"
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| 29 | #include "libaout.h"
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| 30 |
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| 31 | #if 0
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| 32 | struct exe_header
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| 33 | {
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| 34 | unsigned short magic;
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| 35 | unsigned short bytes_in_last_page;
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| 36 | unsigned short npages; /* number of 512-byte "pages" including this header */
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| 37 | unsigned short nrelocs;
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| 38 | unsigned short header_paras; /* number of 16-byte paragraphs in header */
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| 39 | unsigned short reserved;
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| 40 | unsigned short load_switch;
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| 41 | unsigned short ss_ofs;
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| 42 | unsigned short sp;
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| 43 | unsigned short checksum;
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| 44 | unsigned short ip;
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| 45 | unsigned short cs_ofs;
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| 46 | unsigned short reloc_ofs;
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| 47 | unsigned short reserved2;
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| 48 | unsigned short something1;
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| 49 | unsigned short something2;
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| 50 | unsigned short something3;
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| 51 | };
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| 52 | #endif
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| 53 |
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| 54 | #define EXE_MAGIC 0x5a4d
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| 55 | #define EXE_LOAD_HIGH 0x0000
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| 56 | #define EXE_LOAD_LOW 0xffff
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| 57 | #define EXE_PAGE_SIZE 512
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| 58 |
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| 59 |
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| 60 | static int
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| 61 | msdos_sizeof_headers (abfd, exec)
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| 62 | bfd *abfd ATTRIBUTE_UNUSED;
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| 63 | boolean exec ATTRIBUTE_UNUSED;
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| 64 | {
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| 65 | return 0;
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| 66 | }
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| 67 |
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| 68 | static boolean
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| 69 | msdos_write_object_contents (abfd)
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| 70 | bfd *abfd;
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| 71 | {
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| 72 | static char hdr[EXE_PAGE_SIZE];
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| 73 | file_ptr outfile_size = sizeof(hdr);
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| 74 | bfd_vma high_vma = 0;
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| 75 | asection *sec;
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| 76 |
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| 77 | /* Find the total size of the program on disk and in memory. */
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| 78 | for (sec = abfd->sections; sec != (asection *) NULL; sec = sec->next)
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| 79 | {
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| 80 | if (bfd_get_section_size_before_reloc (sec) == 0)
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| 81 | continue;
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| 82 | if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC)
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| 83 | {
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| 84 | bfd_vma sec_vma = bfd_get_section_vma (abfd, sec)
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| 85 | + bfd_get_section_size_before_reloc (sec);
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| 86 | if (sec_vma > high_vma)
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| 87 | high_vma = sec_vma;
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| 88 | }
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| 89 | if (bfd_get_section_flags (abfd, sec) & SEC_LOAD)
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| 90 | {
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| 91 | file_ptr sec_end = sizeof(hdr)
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| 92 | + bfd_get_section_vma (abfd, sec)
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| 93 | + bfd_get_section_size_before_reloc (sec);
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| 94 | if (sec_end > outfile_size)
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| 95 | outfile_size = sec_end;
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| 96 | }
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| 97 | }
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| 98 |
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| 99 | /* Make sure the program isn't too big. */
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| 100 | if (high_vma > (bfd_vma)0xffff)
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| 101 | {
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| 102 | bfd_set_error(bfd_error_file_too_big);
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| 103 | return false;
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| 104 | }
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| 105 |
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| 106 | /* constants */
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| 107 | bfd_h_put_16(abfd, EXE_MAGIC, &hdr[0]);
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| 108 | bfd_h_put_16(abfd, EXE_PAGE_SIZE / 16, &hdr[8]);
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| 109 | bfd_h_put_16(abfd, EXE_LOAD_LOW, &hdr[12]);
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| 110 | bfd_h_put_16(abfd, 0x3e, &hdr[24]);
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| 111 | bfd_h_put_16(abfd, 0x0001, &hdr[28]); /* XXX??? */
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| 112 | bfd_h_put_16(abfd, 0x30fb, &hdr[30]); /* XXX??? */
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| 113 | bfd_h_put_16(abfd, 0x726a, &hdr[32]); /* XXX??? */
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| 114 |
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| 115 | /* bytes in last page (0 = full page) */
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| 116 | bfd_h_put_16(abfd, outfile_size & (EXE_PAGE_SIZE - 1), &hdr[2]);
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| 117 |
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| 118 | /* number of pages */
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| 119 | bfd_h_put_16(abfd, (outfile_size + EXE_PAGE_SIZE - 1) / EXE_PAGE_SIZE,
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| 120 | &hdr[4]);
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| 121 |
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| 122 | /* Set the initial stack pointer to the end of the bss.
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| 123 | The program's crt0 code must relocate it to a real stack. */
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| 124 | bfd_h_put_16(abfd, high_vma, &hdr[16]);
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| 125 |
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| 126 | if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
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| 127 | || bfd_write (hdr, 1, sizeof(hdr), abfd) != sizeof(hdr))
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| 128 | return false;
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| 129 |
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| 130 | return true;
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| 131 | }
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| 132 |
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| 133 | static boolean
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| 134 | msdos_set_section_contents (abfd, section, location, offset, count)
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| 135 | bfd *abfd;
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| 136 | sec_ptr section;
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| 137 | PTR location;
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| 138 | file_ptr offset;
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| 139 | bfd_size_type count;
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| 140 | {
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| 141 |
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| 142 | if (count == 0)
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| 143 | return true;
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| 144 |
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| 145 | section->filepos = EXE_PAGE_SIZE + bfd_get_section_vma (abfd, section);
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| 146 |
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| 147 | if (bfd_get_section_flags (abfd, section) & SEC_LOAD)
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| 148 | {
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| 149 | if (bfd_seek (abfd, (file_ptr) (section->filepos + offset), SEEK_SET) != 0
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| 150 | || bfd_write (location, 1, count, abfd) != count)
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| 151 | return false;
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| 152 | }
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| 153 |
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| 154 | return true;
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| 155 | }
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| 156 |
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| 157 |
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| 158 |
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| 159 | #define msdos_mkobject aout_32_mkobject
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| 160 | #define msdos_make_empty_symbol aout_32_make_empty_symbol
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| 161 | #define msdos_bfd_reloc_type_lookup aout_32_reloc_type_lookup
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| 162 |
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| 163 | #define msdos_close_and_cleanup _bfd_generic_close_and_cleanup
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| 164 | #define msdos_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
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| 165 | #define msdos_new_section_hook _bfd_generic_new_section_hook
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| 166 | #define msdos_get_section_contents _bfd_generic_get_section_contents
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| 167 | #define msdos_get_section_contents_in_window \
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| 168 | _bfd_generic_get_section_contents_in_window
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| 169 | #define msdos_bfd_get_relocated_section_contents \
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| 170 | bfd_generic_get_relocated_section_contents
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| 171 | #define msdos_bfd_relax_section bfd_generic_relax_section
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| 172 | #define msdos_bfd_gc_sections bfd_generic_gc_sections
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| 173 | #define msdos_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
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| 174 | #define msdos_bfd_link_add_symbols _bfd_generic_link_add_symbols
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| 175 | #define msdos_bfd_final_link _bfd_generic_final_link
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| 176 | #define msdos_bfd_link_split_section _bfd_generic_link_split_section
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| 177 | #define msdos_set_arch_mach _bfd_generic_set_arch_mach
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| 178 |
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| 179 | #define msdos_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
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| 180 | #define msdos_get_symtab _bfd_nosymbols_get_symtab
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| 181 | #define msdos_print_symbol _bfd_nosymbols_print_symbol
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| 182 | #define msdos_get_symbol_info _bfd_nosymbols_get_symbol_info
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| 183 | #define msdos_find_nearest_line _bfd_nosymbols_find_nearest_line
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| 184 | #define msdos_get_lineno _bfd_nosymbols_get_lineno
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| 185 | #define msdos_bfd_is_local_label_name _bfd_nosymbols_bfd_is_local_label_name
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| 186 | #define msdos_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
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| 187 | #define msdos_read_minisymbols _bfd_nosymbols_read_minisymbols
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| 188 | #define msdos_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
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| 189 |
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| 190 | #define msdos_canonicalize_reloc _bfd_norelocs_canonicalize_reloc
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| 191 | #define msdos_get_reloc_upper_bound _bfd_norelocs_get_reloc_upper_bound
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| 192 | #define msdos_32_bfd_link_split_section _bfd_generic_link_split_section
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| 193 |
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| 194 | const bfd_target i386msdos_vec =
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| 195 | {
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| 196 | "msdos", /* name */
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| 197 | bfd_target_msdos_flavour,
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| 198 | BFD_ENDIAN_LITTLE, /* target byte order */
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| 199 | BFD_ENDIAN_LITTLE, /* target headers byte order */
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| 200 | (EXEC_P), /* object flags */
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| 201 | (SEC_CODE | SEC_DATA | SEC_HAS_CONTENTS
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| 202 | | SEC_ALLOC | SEC_LOAD), /* section flags */
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| 203 | 0, /* leading underscore */
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| 204 | ' ', /* ar_pad_char */
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| 205 | 16, /* ar_max_namelen */
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| 206 | bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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| 207 | bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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| 208 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
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| 209 | bfd_getl64, bfd_getl_signed_64, bfd_putl64,
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| 210 | bfd_getl32, bfd_getl_signed_32, bfd_putl32,
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| 211 | bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
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| 212 |
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| 213 | {
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| 214 | _bfd_dummy_target,
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| 215 | _bfd_dummy_target, /* bfd_check_format */
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| 216 | _bfd_dummy_target,
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| 217 | _bfd_dummy_target,
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| 218 | },
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| 219 | {
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| 220 | bfd_false,
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| 221 | msdos_mkobject,
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| 222 | _bfd_generic_mkarchive,
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| 223 | bfd_false,
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| 224 | },
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| 225 | { /* bfd_write_contents */
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| 226 | bfd_false,
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| 227 | msdos_write_object_contents,
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| 228 | _bfd_write_archive_contents,
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| 229 | bfd_false,
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| 230 | },
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| 231 |
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| 232 | BFD_JUMP_TABLE_GENERIC (msdos),
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| 233 | BFD_JUMP_TABLE_COPY (_bfd_generic),
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| 234 | BFD_JUMP_TABLE_CORE (_bfd_nocore),
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| 235 | BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
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| 236 | BFD_JUMP_TABLE_SYMBOLS (msdos),
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| 237 | BFD_JUMP_TABLE_RELOCS (msdos),
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| 238 | BFD_JUMP_TABLE_WRITE (msdos),
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| 239 | BFD_JUMP_TABLE_LINK (msdos),
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| 240 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
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| 241 |
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| 242 | NULL,
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| 243 |
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| 244 | (PTR) 0
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| 245 | };
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| 246 |
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| 247 |
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