Initial revision

1 files changed, 244 insertions, 0 deletions

diff --git a/bfd/i386msdos.c b/bfd/i386msdos.c
new file mode 100644
index 00000000000..c6f24b2ac33
--- /dev/null
+++ b/bfd/i386msdos.c
@@ -0,0 +1,244 @@
+/* BFD back-end for MS-DOS executables.
+   Copyright 1990, 91, 92, 93, 94, 95, 96, 1997 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;
+     boolean exec;
+{
+  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),
+
+  (PTR) 0
+};
+
+