binutils-gdb/bfd/i386msdos.c

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1999-05-03 09:29:11 +02:00
/* BFD back-end for MS-DOS executables.
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Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999
Free Software Foundation, Inc.
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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;
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{
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
* merge.c (struct sec_merge_hash_entry): Add u.entsize and u.suffix fields, change sec into secinfo. (struct sec_merge_info): Add chain, remove last fields. (struct sec_merge_sec_info): Add next, sec, psecinfo fields. (sec_merge_hash_lookup): If lookup could not use a string only because it has bad alignment, mark the old string for deletion. (sec_merge_add): Add secinfo argument. Don't compute entry's position, instead record the section. (sec_merge_emit): Update for the sec into secinfo change in struct sec_merge_hash_entry. (_bfd_merge_section): Only record the section for merging, defer putting strings into the hash table. (cmplengthentry, last4_eq, last_eq, record_section, merge_strings, _bfd_merge_sections): New functions. (_bfd_merged_section_offset): Update for the sec_merge_hash_entry changes. * libbfd-in.h (_bfd_merge_sections): Add prototype. (_bfd_nolink_bfd_merge_sections): Define. * libbfd.h: Likewise. (bfd_generic_merge_sections): Add prototype. * targets.c (BFD_JUMP_TABLE_LINK): Add _bfd_merge_sections. (struct bfd_target): Likewise. * bfd.c (bfd_merge_sections): Define. * bfd-in2.h: Rebuilt. * elf.c (_bfd_elf_merge_sections): New function. * elf-bfd.h (_bfd_elf_merge_sections): Add prototype. * elfxx-target.h (bfd_elfNN_bfd_merge_sections): Define. * reloc.c (bfd_generic_merge_sections): New function. * vms.c (vms_bfd_merge_sections): New function. * aout-adobe.c (aout_32_bfd_merge_sections): Define. * aout-target.h (MY_bfd_merge_sections): Define. * aout-tic30.c (MY_bfd_merge_sections): Define. * binary.c (binary_bfd_merge_sections): Define. * bout.c (b_out_bfd_merge_sections): Define. * coff-alpha.c (_bfd_ecoff_bfd_merge_sections): Define. * coffcode.c (coff_bfd_merge_sections): Define. * coff-mips.c (_bfd_ecoff_bfd_merge_sections): Define. * i386msdos.c (msdos_bfd_merge_sections): Define. * i386os9k.c (os9k_bfd_merge_sections): Define. * ieee.c (ieee_bfd_merge_sections): Define. * ihex.c (ihex_bfd_merge_sections): Define. * nlm-target.h (nlm_bfd_merge_sections): Define. * oasys.c (oasys_bfd_merge_sections): Define. * ppcboot.c (ppcboot_bfd_merge_sections): Define. * som.c (som_bfd_merge_sections): Define. * srec.c (srec_bfd_merge_sections): Define. * tekhex.c (tekhex_bfd_merge_sections): Define. * versados.c (versados_bfd_merge_sections): Define. * xcoff-target.h (_bfd_xcoff_bfd_merge_sections): Define. * ldlang.c (lang_process): Call bfd_merge_sections.
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#define msdos_bfd_merge_sections bfd_generic_merge_sections
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#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,
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(PTR) 0
};