401 lines
14 KiB
C
401 lines
14 KiB
C
/* BFD back-end for Intel 386 COFF files.
|
|
Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
|
|
Written by Cygnus Support.
|
|
|
|
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
#include "bfd.h"
|
|
#include "sysdep.h"
|
|
#include "libbfd.h"
|
|
#include "obstack.h"
|
|
#include "coff/i386.h"
|
|
#include "coff/internal.h"
|
|
#include "libcoff.h"
|
|
|
|
static bfd_reloc_status_type coff_i386_reloc
|
|
PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
|
|
static const struct reloc_howto_struct *coff_i386_rtype_to_howto
|
|
PARAMS ((bfd *, asection *, struct internal_reloc *,
|
|
struct coff_link_hash_entry *, struct internal_syment *,
|
|
bfd_vma *));
|
|
|
|
#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
|
|
|
|
/* The page size is a guess based on ELF. */
|
|
#define COFF_PAGE_SIZE 0x1000
|
|
|
|
/* For some reason when using i386 COFF the value stored in the .text
|
|
section for a reference to a common symbol is the value itself plus
|
|
any desired offset. Ian Taylor, Cygnus Support. */
|
|
|
|
/* If we are producing relocateable output, we need to do some
|
|
adjustments to the object file that are not done by the
|
|
bfd_perform_relocation function. This function is called by every
|
|
reloc type to make any required adjustments. */
|
|
|
|
static bfd_reloc_status_type
|
|
coff_i386_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
|
|
error_message)
|
|
bfd *abfd;
|
|
arelent *reloc_entry;
|
|
asymbol *symbol;
|
|
PTR data;
|
|
asection *input_section;
|
|
bfd *output_bfd;
|
|
char **error_message;
|
|
{
|
|
symvalue diff;
|
|
|
|
if (output_bfd == (bfd *) NULL)
|
|
return bfd_reloc_continue;
|
|
|
|
if (bfd_is_com_section (symbol->section))
|
|
{
|
|
/* We are relocating a common symbol. The current value in the
|
|
object file is ORIG + OFFSET, where ORIG is the value of the
|
|
common symbol as seen by the object file when it was compiled
|
|
(this may be zero if the symbol was undefined) and OFFSET is
|
|
the offset into the common symbol (normally zero, but may be
|
|
non-zero when referring to a field in a common structure).
|
|
ORIG is the negative of reloc_entry->addend, which is set by
|
|
the CALC_ADDEND macro below. We want to replace the value in
|
|
the object file with NEW + OFFSET, where NEW is the value of
|
|
the common symbol which we are going to put in the final
|
|
object file. NEW is symbol->value. */
|
|
diff = symbol->value + reloc_entry->addend;
|
|
}
|
|
else
|
|
{
|
|
/* For some reason bfd_perform_relocation always effectively
|
|
ignores the addend for a COFF target when producing
|
|
relocateable output. This seems to be always wrong for 386
|
|
COFF, so we handle the addend here instead. */
|
|
diff = reloc_entry->addend;
|
|
}
|
|
|
|
#define DOIT(x) \
|
|
x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))
|
|
|
|
if (diff != 0)
|
|
{
|
|
reloc_howto_type *howto = reloc_entry->howto;
|
|
unsigned char *addr = (unsigned char *) data + reloc_entry->address;
|
|
|
|
switch (howto->size)
|
|
{
|
|
case 0:
|
|
{
|
|
char x = bfd_get_8 (abfd, addr);
|
|
DOIT (x);
|
|
bfd_put_8 (abfd, x, addr);
|
|
}
|
|
break;
|
|
|
|
case 1:
|
|
{
|
|
short x = bfd_get_16 (abfd, addr);
|
|
DOIT (x);
|
|
bfd_put_16 (abfd, x, addr);
|
|
}
|
|
break;
|
|
|
|
case 2:
|
|
{
|
|
long x = bfd_get_32 (abfd, addr);
|
|
DOIT (x);
|
|
bfd_put_32 (abfd, x, addr);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
abort ();
|
|
}
|
|
}
|
|
|
|
/* Now let bfd_perform_relocation finish everything up. */
|
|
return bfd_reloc_continue;
|
|
}
|
|
|
|
static reloc_howto_type howto_table[] =
|
|
{
|
|
{0},
|
|
{1},
|
|
{2},
|
|
{3},
|
|
{4},
|
|
{5},
|
|
HOWTO (R_DIR32, /* type */
|
|
0, /* rightshift */
|
|
2, /* size (0 = byte, 1 = short, 2 = long) */
|
|
32, /* bitsize */
|
|
false, /* pc_relative */
|
|
0, /* bitpos */
|
|
complain_overflow_bitfield, /* complain_on_overflow */
|
|
coff_i386_reloc, /* special_function */
|
|
"dir32", /* name */
|
|
true, /* partial_inplace */
|
|
0xffffffff, /* src_mask */
|
|
0xffffffff, /* dst_mask */
|
|
false), /* pcrel_offset */
|
|
{7},
|
|
{010},
|
|
{011},
|
|
{012},
|
|
{013},
|
|
{014},
|
|
{015},
|
|
{016},
|
|
HOWTO (R_RELBYTE, /* type */
|
|
0, /* rightshift */
|
|
0, /* size (0 = byte, 1 = short, 2 = long) */
|
|
8, /* bitsize */
|
|
false, /* pc_relative */
|
|
0, /* bitpos */
|
|
complain_overflow_bitfield, /* complain_on_overflow */
|
|
coff_i386_reloc, /* special_function */
|
|
"8", /* name */
|
|
true, /* partial_inplace */
|
|
0x000000ff, /* src_mask */
|
|
0x000000ff, /* dst_mask */
|
|
false), /* pcrel_offset */
|
|
HOWTO (R_RELWORD, /* type */
|
|
0, /* rightshift */
|
|
1, /* size (0 = byte, 1 = short, 2 = long) */
|
|
16, /* bitsize */
|
|
false, /* pc_relative */
|
|
0, /* bitpos */
|
|
complain_overflow_bitfield, /* complain_on_overflow */
|
|
coff_i386_reloc, /* special_function */
|
|
"16", /* name */
|
|
true, /* partial_inplace */
|
|
0x0000ffff, /* src_mask */
|
|
0x0000ffff, /* dst_mask */
|
|
false), /* pcrel_offset */
|
|
HOWTO (R_RELLONG, /* type */
|
|
0, /* rightshift */
|
|
2, /* size (0 = byte, 1 = short, 2 = long) */
|
|
32, /* bitsize */
|
|
false, /* pc_relative */
|
|
0, /* bitpos */
|
|
complain_overflow_bitfield, /* complain_on_overflow */
|
|
coff_i386_reloc, /* special_function */
|
|
"32", /* name */
|
|
true, /* partial_inplace */
|
|
0xffffffff, /* src_mask */
|
|
0xffffffff, /* dst_mask */
|
|
false), /* pcrel_offset */
|
|
HOWTO (R_PCRBYTE, /* type */
|
|
0, /* rightshift */
|
|
0, /* size (0 = byte, 1 = short, 2 = long) */
|
|
8, /* bitsize */
|
|
true, /* pc_relative */
|
|
0, /* bitpos */
|
|
complain_overflow_signed, /* complain_on_overflow */
|
|
coff_i386_reloc, /* special_function */
|
|
"DISP8", /* name */
|
|
true, /* partial_inplace */
|
|
0x000000ff, /* src_mask */
|
|
0x000000ff, /* dst_mask */
|
|
false), /* pcrel_offset */
|
|
HOWTO (R_PCRWORD, /* type */
|
|
0, /* rightshift */
|
|
1, /* size (0 = byte, 1 = short, 2 = long) */
|
|
16, /* bitsize */
|
|
true, /* pc_relative */
|
|
0, /* bitpos */
|
|
complain_overflow_signed, /* complain_on_overflow */
|
|
coff_i386_reloc, /* special_function */
|
|
"DISP16", /* name */
|
|
true, /* partial_inplace */
|
|
0x0000ffff, /* src_mask */
|
|
0x0000ffff, /* dst_mask */
|
|
false), /* pcrel_offset */
|
|
HOWTO (R_PCRLONG, /* type */
|
|
0, /* rightshift */
|
|
2, /* size (0 = byte, 1 = short, 2 = long) */
|
|
32, /* bitsize */
|
|
true, /* pc_relative */
|
|
0, /* bitpos */
|
|
complain_overflow_signed, /* complain_on_overflow */
|
|
coff_i386_reloc, /* special_function */
|
|
"DISP32", /* name */
|
|
true, /* partial_inplace */
|
|
0xffffffff, /* src_mask */
|
|
0xffffffff, /* dst_mask */
|
|
false) /* pcrel_offset */
|
|
};
|
|
|
|
/* Turn a howto into a reloc nunmber */
|
|
|
|
#define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
|
|
#define BADMAG(x) I386BADMAG(x)
|
|
#define I386 1 /* Customize coffcode.h */
|
|
|
|
#define RTYPE2HOWTO(cache_ptr, dst) \
|
|
(cache_ptr)->howto = howto_table + (dst)->r_type;
|
|
|
|
/* On SCO Unix 3.2.2 the native assembler generates two .data
|
|
sections. We handle that by renaming the second one to .data2. It
|
|
does no harm to do this for any 386 COFF target. */
|
|
#define TWO_DATA_SECS
|
|
|
|
/* For 386 COFF a STYP_NOLOAD | STYP_BSS section is part of a shared
|
|
library. On some other COFF targets STYP_BSS is normally
|
|
STYP_NOLOAD. */
|
|
#define BSS_NOLOAD_IS_SHARED_LIBRARY
|
|
|
|
/* Compute the addend of a reloc. If the reloc is to a common symbol,
|
|
the object file contains the value of the common symbol. By the
|
|
time this is called, the linker may be using a different symbol
|
|
from a different object file with a different value. Therefore, we
|
|
hack wildly to locate the original symbol from this file so that we
|
|
can make the correct adjustment. This macro sets coffsym to the
|
|
symbol from the original file, and uses it to set the addend value
|
|
correctly. If this is not a common symbol, the usual addend
|
|
calculation is done, except that an additional tweak is needed for
|
|
PC relative relocs.
|
|
FIXME: This macro refers to symbols and asect; these are from the
|
|
calling function, not the macro arguments. */
|
|
|
|
#define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
|
|
{ \
|
|
coff_symbol_type *coffsym = (coff_symbol_type *) NULL; \
|
|
if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
|
|
coffsym = (obj_symbols (abfd) \
|
|
+ (cache_ptr->sym_ptr_ptr - symbols)); \
|
|
else if (ptr) \
|
|
coffsym = coff_symbol_from (abfd, ptr); \
|
|
if (coffsym != (coff_symbol_type *) NULL \
|
|
&& coffsym->native->u.syment.n_scnum == 0) \
|
|
cache_ptr->addend = - coffsym->native->u.syment.n_value; \
|
|
else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
|
|
&& ptr->section != (asection *) NULL) \
|
|
cache_ptr->addend = - (ptr->section->vma + ptr->value); \
|
|
else \
|
|
cache_ptr->addend = 0; \
|
|
if (ptr && howto_table[reloc.r_type].pc_relative) \
|
|
cache_ptr->addend += asect->vma; \
|
|
}
|
|
|
|
/* We use the special COFF backend linker. */
|
|
#define coff_relocate_section _bfd_coff_generic_relocate_section
|
|
|
|
static const struct reloc_howto_struct *
|
|
coff_i386_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
|
|
bfd *abfd;
|
|
asection *sec;
|
|
struct internal_reloc *rel;
|
|
struct coff_link_hash_entry *h;
|
|
struct internal_syment *sym;
|
|
bfd_vma *addendp;
|
|
{
|
|
const struct reloc_howto_struct *howto;
|
|
|
|
howto = howto_table + rel->r_type;
|
|
|
|
if (howto->pc_relative)
|
|
*addendp += sec->vma;
|
|
|
|
if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
|
|
{
|
|
/* This is a common symbol. The section contents include the
|
|
size (sym->n_value) as an addend. The relocate_section
|
|
function will be adding in the final value of the symbol. We
|
|
need to subtract out the current size in order to get the
|
|
correct result. */
|
|
BFD_ASSERT (h != NULL);
|
|
*addendp -= sym->n_value;
|
|
}
|
|
|
|
/* If the output symbol is common (in which case this must be a
|
|
relocateable link), we need to add in the final size of the
|
|
common symbol. */
|
|
if (h != NULL && h->root.type == bfd_link_hash_common)
|
|
*addendp += h->root.u.c.size;
|
|
|
|
return howto;
|
|
}
|
|
|
|
#define coff_rtype_to_howto coff_i386_rtype_to_howto
|
|
|
|
#include "coffcode.h"
|
|
|
|
static const bfd_target *
|
|
i3coff_object_p(a)
|
|
bfd *a;
|
|
{
|
|
return coff_object_p(a);
|
|
}
|
|
|
|
const bfd_target
|
|
#ifdef TARGET_SYM
|
|
TARGET_SYM =
|
|
#else
|
|
i386coff_vec =
|
|
#endif
|
|
{
|
|
#ifdef TARGET_NAME
|
|
TARGET_NAME,
|
|
#else
|
|
"coff-i386", /* name */
|
|
#endif
|
|
bfd_target_coff_flavour,
|
|
false, /* data byte order is little */
|
|
false, /* header byte order is little */
|
|
|
|
(HAS_RELOC | EXEC_P | /* object flags */
|
|
HAS_LINENO | HAS_DEBUG |
|
|
HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
|
|
|
|
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
|
|
#ifdef TARGET_UNDERSCORE
|
|
TARGET_UNDERSCORE, /* leading underscore */
|
|
#else
|
|
0, /* leading underscore */
|
|
#endif
|
|
'/', /* ar_pad_char */
|
|
15, /* ar_max_namelen */
|
|
|
|
2, /* minimum alignment power */
|
|
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 */
|
|
|
|
/* Note that we allow an object file to be treated as a core file as well. */
|
|
{_bfd_dummy_target, i3coff_object_p, /* bfd_check_format */
|
|
bfd_generic_archive_p, i3coff_object_p},
|
|
{bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
|
|
bfd_false},
|
|
{bfd_false, coff_write_object_contents, /* bfd_write_contents */
|
|
_bfd_write_archive_contents, bfd_false},
|
|
|
|
BFD_JUMP_TABLE_GENERIC (coff),
|
|
BFD_JUMP_TABLE_COPY (coff),
|
|
BFD_JUMP_TABLE_CORE (_bfd_nocore),
|
|
BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
|
|
BFD_JUMP_TABLE_SYMBOLS (coff),
|
|
BFD_JUMP_TABLE_RELOCS (coff),
|
|
BFD_JUMP_TABLE_WRITE (coff),
|
|
BFD_JUMP_TABLE_LINK (coff),
|
|
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
|
|
|
|
COFF_SWAP_TABLE,
|
|
};
|