/* BFD back-end for Intel 386 COFF files.
- Copyright 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
+ Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 98, 1999
+ Free Software Foundation, Inc.
Written by Cygnus Support.
This file is part of BFD, the Binary File Descriptor library.
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. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
-#include "obstack.h"
+
#include "coff/i386.h"
+
#include "coff/internal.h"
+
+#ifdef COFF_WITH_PE
+#include "coff/pe.h"
+#endif
+
+#ifdef COFF_GO32_EXE
+#include "coff/go32exe.h"
+#endif
+
#include "libcoff.h"
-static bfd_reloc_status_type coff_i386_reloc PARAMS ((bfd *abfd,
- arelent *reloc_entry,
- asymbol *symbol,
- PTR data,
- asection *input_section,
- bfd *output_bfd));
+static bfd_reloc_status_type coff_i386_reloc
+ PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
+static reloc_howto_type *coff_i386_rtype_to_howto
+ PARAMS ((bfd *, asection *, struct internal_reloc *,
+ struct coff_link_hash_entry *, struct internal_syment *,
+ bfd_vma *));
+static reloc_howto_type *coff_i386_reloc_type_lookup
+ PARAMS ((bfd *, bfd_reloc_code_real_type));
+static const bfd_target *i3coff_object_p PARAMS ((bfd *));
+
+#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
reloc type to make any required adjustments. */
static bfd_reloc_status_type
-coff_i386_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd)
+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;
+ asection *input_section ATTRIBUTE_UNUSED;
bfd *output_bfd;
+ char **error_message ATTRIBUTE_UNUSED;
{
symvalue diff;
if (bfd_is_com_section (symbol->section))
{
+#ifndef COFF_WITH_PE
/* 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
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
+ /* In PE mode, we do not offset the common symbol. */
+ diff = reloc_entry->addend;
+#endif
}
else
{
diff = reloc_entry->addend;
}
+#ifdef COFF_WITH_PE
+ /* FIXME: How should this case be handled? */
+ if (reloc_entry->howto->type == R_IMAGEBASE)
+ diff -= pe_data (output_bfd)->pe_opthdr.ImageBase;
+#endif
+
#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;
+ if (diff != 0)
+ {
+ reloc_howto_type *howto = reloc_entry->howto;
+ unsigned char *addr = (unsigned char *) data + reloc_entry->address;
- switch (howto->size)
- {
- case 0:
+ switch (howto->size)
{
- char x = bfd_get_8 (abfd, addr);
- DOIT (x);
- bfd_put_8 (abfd, x, addr);
+ 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 ();
}
- 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;
}
+#ifdef COFF_WITH_PE
+
+/* Return true if this relocation should appear in the output .reloc
+ section. */
+
+static boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *));
+
+static boolean in_reloc_p (abfd, howto)
+ bfd *abfd ATTRIBUTE_UNUSED;
+ reloc_howto_type *howto;
+{
+ return ! howto->pc_relative && howto->type != R_IMAGEBASE;
+}
+
+#endif /* COFF_WITH_PE */
+
+#ifndef PCRELOFFSET
+#define PCRELOFFSET false
+#endif
+
static reloc_howto_type howto_table[] =
{
- {0},
- {1},
- {2},
- {3},
- {4},
- {5},
+ EMPTY_HOWTO (0),
+ EMPTY_HOWTO (1),
+ EMPTY_HOWTO (2),
+ EMPTY_HOWTO (3),
+ EMPTY_HOWTO (4),
+ EMPTY_HOWTO (5),
HOWTO (R_DIR32, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
+ true), /* pcrel_offset */
+ /* PE IMAGE_REL_I386_DIR32NB relocation (7). */
+ HOWTO (R_IMAGEBASE, /* 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 */
+ "rva32", /* 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 */
+ EMPTY_HOWTO (010),
+ EMPTY_HOWTO (011),
+ EMPTY_HOWTO (012),
+ EMPTY_HOWTO (013),
+ EMPTY_HOWTO (014),
+ EMPTY_HOWTO (015),
+ EMPTY_HOWTO (016),
+ /* Byte relocation (017). */
+ HOWTO (R_RELBYTE, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
8, /* bitsize */
true, /* partial_inplace */
0x000000ff, /* src_mask */
0x000000ff, /* dst_mask */
- false), /* pcrel_offset */
+ PCRELOFFSET), /* pcrel_offset */
+ /* 16-bit word relocation (020). */
HOWTO (R_RELWORD, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
true, /* partial_inplace */
0x0000ffff, /* src_mask */
0x0000ffff, /* dst_mask */
- false), /* pcrel_offset */
+ PCRELOFFSET), /* pcrel_offset */
+ /* 32-bit longword relocation (021). */
HOWTO (R_RELLONG, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
- false), /* pcrel_offset */
+ PCRELOFFSET), /* pcrel_offset */
+ /* Byte PC relative relocation (022). */
HOWTO (R_PCRBYTE, /* type */
0, /* rightshift */
0, /* size (0 = byte, 1 = short, 2 = long) */
true, /* partial_inplace */
0x000000ff, /* src_mask */
0x000000ff, /* dst_mask */
- false), /* pcrel_offset */
+ PCRELOFFSET), /* pcrel_offset */
+ /* 16-bit word PC relative relocation (023). */
HOWTO (R_PCRWORD, /* type */
0, /* rightshift */
1, /* size (0 = byte, 1 = short, 2 = long) */
true, /* partial_inplace */
0x0000ffff, /* src_mask */
0x0000ffff, /* dst_mask */
- false), /* pcrel_offset */
+ PCRELOFFSET), /* pcrel_offset */
+ /* 32-bit longword PC relative relocation (024). */
HOWTO (R_PCRLONG, /* type */
0, /* rightshift */
2, /* size (0 = byte, 1 = short, 2 = long) */
true, /* partial_inplace */
0xffffffff, /* src_mask */
0xffffffff, /* dst_mask */
- false) /* pcrel_offset */
+ PCRELOFFSET) /* pcrel_offset */
};
/* Turn a howto into a reloc nunmber */
-#define SELECT_RELOC(x,howto) { x = howto->type; }
+#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
+#define RTYPE2HOWTO(cache_ptr, dst) \
+ ((cache_ptr)->howto = \
+ ((dst)->r_type < sizeof (howto_table) / sizeof (howto_table[0]) \
+ ? howto_table + (dst)->r_type \
+ : NULL))
/* For 386 COFF a STYP_NOLOAD | STYP_BSS section is part of a shared
library. On some other COFF targets STYP_BSS is normally
cache_ptr->addend += asect->vma; \
}
-/* For aix386, define a variable to track the number of sections discarded
- during a strip. */
+/* We use the special COFF backend linker. For normal i386 COFF, we
+ can use the generic relocate_section routine. For PE, we need our
+ own routine. */
+
+#ifndef COFF_WITH_PE
+
+#define coff_relocate_section _bfd_coff_generic_relocate_section
+
+#else /* COFF_WITH_PE */
+
+/* The PE relocate section routine. The only difference between this
+ and the regular routine is that we don't want to do anything for a
+ relocateable link. */
-#if defined(_AIX) && defined(_I386)
-#define USE_DISCARDED_SECTIONS_COUNT
-int discarded_sections_count = 0;
+static boolean coff_pe_i386_relocate_section
+ PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
+ struct internal_reloc *, struct internal_syment *, asection **));
+
+static boolean
+coff_pe_i386_relocate_section (output_bfd, info, input_bfd,
+ input_section, contents, relocs, syms,
+ sections)
+ bfd *output_bfd;
+ struct bfd_link_info *info;
+ bfd *input_bfd;
+ asection *input_section;
+ bfd_byte *contents;
+ struct internal_reloc *relocs;
+ struct internal_syment *syms;
+ asection **sections;
+{
+ if (info->relocateable)
+ return true;
+
+ return _bfd_coff_generic_relocate_section (output_bfd, info, input_bfd,
+ input_section, contents,
+ relocs, syms, sections);
+}
+
+#define coff_relocate_section coff_pe_i386_relocate_section
+
+#endif /* COFF_WITH_PE */
+
+/* Convert an rtype to howto for the COFF backend linker. */
+
+static reloc_howto_type *
+coff_i386_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
+ bfd *abfd ATTRIBUTE_UNUSED;
+ asection *sec;
+ struct internal_reloc *rel;
+ struct coff_link_hash_entry *h;
+ struct internal_syment *sym;
+ bfd_vma *addendp;
+{
+ reloc_howto_type *howto;
+
+ if (rel->r_type > sizeof (howto_table) / sizeof (howto_table[0]))
+ {
+ bfd_set_error (bfd_error_bad_value);
+ return NULL;
+ }
+
+ howto = howto_table + rel->r_type;
+
+#ifdef COFF_WITH_PE
+ /* Cancel out code in _bfd_coff_generic_relocate_section. */
+ *addendp = 0;
#endif
+
+ 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);
+
+#ifndef COFF_WITH_PE
+ /* I think we *do* want to bypass this. If we don't, I have
+ seen some data parameters get the wrong relocation address.
+ If I link two versions with and without this section bypassed
+ and then do a binary comparison, the addresses which are
+ different can be looked up in the map. The case in which
+ this section has been bypassed has addresses which correspond
+ to values I can find in the map. */
+ *addendp -= sym->n_value;
+#endif
+ }
+
+#ifndef COFF_WITH_PE
+ /* 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;
+#endif
+
+#ifdef COFF_WITH_PE
+ if (howto->pc_relative)
+ {
+ *addendp -= 4;
+
+ /* If the symbol is defined, then the generic code is going to
+ add back the symbol value in order to cancel out an
+ adjustment it made to the addend. However, we set the addend
+ to 0 at the start of this function. We need to adjust here,
+ to avoid the adjustment the generic code will make. FIXME:
+ This is getting a bit hackish. */
+ if (sym != NULL && sym->n_scnum != 0)
+ *addendp -= sym->n_value;
+ }
+
+ if (rel->r_type == R_IMAGEBASE)
+ {
+ *addendp -= pe_data(sec->output_section->owner)->pe_opthdr.ImageBase;
+ }
+#endif
+
+ return howto;
+}
+
+#define coff_bfd_reloc_type_lookup coff_i386_reloc_type_lookup
+
+static reloc_howto_type *
+coff_i386_reloc_type_lookup (abfd, code)
+ bfd *abfd ATTRIBUTE_UNUSED;
+ bfd_reloc_code_real_type code;
+{
+ switch (code)
+ {
+ case BFD_RELOC_RVA:
+ return howto_table +R_IMAGEBASE;
+ case BFD_RELOC_32:
+ return howto_table + R_DIR32;
+ case BFD_RELOC_32_PCREL:
+ return howto_table + R_PCRLONG;
+ default:
+ BFD_FAIL ();
+ return 0;
+ }
+}
+
+#define coff_rtype_to_howto coff_i386_rtype_to_howto
+
+#ifdef TARGET_UNDERSCORE
+
+/* If i386 gcc uses underscores for symbol names, then it does not use
+ a leading dot for local labels, so if TARGET_UNDERSCORE is defined
+ we treat all symbols starting with L as local. */
+
+static boolean coff_i386_is_local_label_name PARAMS ((bfd *, const char *));
+
+static boolean
+coff_i386_is_local_label_name (abfd, name)
+ bfd *abfd;
+ const char *name;
+{
+ if (name[0] == 'L')
+ return true;
+
+ return _bfd_coff_is_local_label_name (abfd, name);
+}
+
+#define coff_bfd_is_local_label_name coff_i386_is_local_label_name
+
+#endif /* TARGET_UNDERSCORE */
+
#include "coffcode.h"
-static bfd_target *
-i3coff_object_p(a)
- bfd *a;
+static const bfd_target *
+i3coff_object_p (abfd)
+ bfd *abfd;
{
- return coff_object_p(a);
+#ifdef COFF_IMAGE_WITH_PE
+ /* We need to hack badly to handle a PE image correctly. In PE
+ images created by the GNU linker, the offset to the COFF header
+ is always the size. However, this is not the case in images
+ generated by other PE linkers. The PE format stores a four byte
+ offset to the PE signature just before the COFF header at
+ location 0x3c of the file. We pick up that offset, verify that
+ the PE signature is there, and then set ourselves up to read in
+ the COFF header. */
+ {
+ bfd_byte ext_offset[4];
+ file_ptr offset;
+ bfd_byte ext_signature[4];
+ unsigned long signature;
+
+ if (bfd_seek (abfd, 0x3c, SEEK_SET) != 0
+ || bfd_read (ext_offset, 1, 4, abfd) != 4)
+ {
+ if (bfd_get_error () != bfd_error_system_call)
+ bfd_set_error (bfd_error_wrong_format);
+ return NULL;
+ }
+ offset = bfd_h_get_32 (abfd, ext_offset);
+ if (bfd_seek (abfd, offset, SEEK_SET) != 0
+ || bfd_read (ext_signature, 1, 4, abfd) != 4)
+ {
+ if (bfd_get_error () != bfd_error_system_call)
+ bfd_set_error (bfd_error_wrong_format);
+ return NULL;
+ }
+ signature = bfd_h_get_32 (abfd, ext_signature);
+
+ if (signature != 0x4550)
+ {
+ bfd_set_error (bfd_error_wrong_format);
+ return NULL;
+ }
+
+ /* Here is the hack. coff_object_p wants to read filhsz bytes to
+ pick up the COFF header. We adjust so that that will work. 20
+ is the size of the i386 COFF filehdr. */
+
+ if (bfd_seek (abfd,
+ (bfd_tell (abfd)
+ - bfd_coff_filhsz (abfd)
+ + 20),
+ SEEK_SET)
+ != 0)
+ {
+ if (bfd_get_error () != bfd_error_system_call)
+ bfd_set_error (bfd_error_wrong_format);
+ return NULL;
+ }
+ }
+#endif
+
+ return coff_object_p (abfd);
}
-bfd_target
+const bfd_target
#ifdef TARGET_SYM
TARGET_SYM =
#else
"coff-i386", /* name */
#endif
bfd_target_coff_flavour,
- false, /* data byte order is little */
- false, /* header byte order is little */
+ BFD_ENDIAN_LITTLE, /* data byte order is little */
+ BFD_ENDIAN_LITTLE, /* header byte order is little */
(HAS_RELOC | EXEC_P | /* object flags */
HAS_LINENO | HAS_DEBUG |
- HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),
+ HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
+
+ (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */
+#ifdef COFF_WITH_PE
+ | SEC_LINK_ONCE | SEC_LINK_DUPLICATES
+#endif
+ | SEC_CODE | SEC_DATA),
- (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_false, coff_write_object_contents, /* bfd_write_contents */
_bfd_write_archive_contents, bfd_false},
- JUMP_TABLE(coff),
- COFF_SWAP_TABLE,
+ 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),
+
+ NULL,
+
+ COFF_SWAP_TABLE
};
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