/* BFD back-end for Intel 386 COFF files.
- Copyright (C) 1990-1991 Free Software Foundation, Inc.
+ Copyright 1990, 91, 92, 93, 94, 95, 96, 1997 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 *, 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 *));
+
+#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;
+ }
+
+#ifdef COFF_WITH_PE
+ /* FIXME: How should this case be handled? */
+ if (reloc_entry->howto->type == R_IMAGEBASE && diff != 0)
+ abort ();
+#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;
+
+ 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;
+}
+
+#ifdef COFF_WITH_PE
+/* Return true if this relocation should
+ appear in the output .reloc section. */
+
+static boolean in_reloc_p(abfd, howto)
+ bfd * abfd;
+ reloc_howto_type *howto;
+{
+ return ! howto->pc_relative && howto->type != R_IMAGEBASE;
+}
+#endif
+
+#ifndef PCRELOFFSET
+#define PCRELOFFSET false
+#endif
static reloc_howto_type howto_table[] =
{
- {0},
- {1},
- {2},
- {3},
- {4},
- {5},
- HOWTO(R_DIR32, 0, 2, 32, false, 0, true,true,0,"dir32", true, 0xffffffff,0xffffffff, false),
- {7},
- {010},
- {011},
- {012},
- {013},
- {014},
- {015},
- {016},
- HOWTO(R_RELBYTE, 0, 0, 8, false, 0, true, true,0,"8", true, 0x000000ff,0x000000ff, false),
- HOWTO(R_RELWORD, 0, 1, 16, false, 0, true, true,0,"16", true, 0x0000ffff,0x0000ffff, false),
- HOWTO(R_RELLONG, 0, 2, 32, false, 0, true, true,0,"32", true, 0xffffffff,0xffffffff, false),
- HOWTO(R_PCRBYTE, 0, 0, 8, true, 0, false, true,0,"DISP8", true, 0x000000ff,0x000000ff, false),
- HOWTO(R_PCRWORD, 0, 1, 16, true, 0, false, true,0,"DISP16", true, 0x0000ffff,0x0000ffff, false),
- HOWTO(R_PCRLONG, 0, 2, 32, true, 0, false, true,0,"DISP32", true, 0xffffffff,0xffffffff, false),
+ {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 */
+ true), /* pcrel_offset */
+ /* {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 */
+ {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 */
+ PCRELOFFSET), /* 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 */
+ PCRELOFFSET), /* 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 */
+ PCRELOFFSET), /* 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 */
+ PCRELOFFSET), /* 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 */
+ PCRELOFFSET), /* 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 */
+ 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;
+ (cache_ptr)->howto = howto_table + (dst)->r_type;
+
+/* 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 reloc_howto_type *
+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;
+{
+
+ reloc_howto_type *howto;
+
+ howto = howto_table + rel->r_type;
+
+#ifdef COFF_WITH_PE
+ *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 relcation 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
+ }
+
+ /* 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;
+
+
+#ifdef COFF_WITH_PE
+ if (howto->pc_relative)
+ *addendp -= 4;
+
+ 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;
+ 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"
-#define coff_write_armap bsd_write_armap
+static const bfd_target *
+i3coff_object_p (abfd)
+ bfd *abfd;
+{
+#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. */
-bfd_target *i3coff_object_p(a)
-bfd *a ;
-{ return coff_object_p(a); }
+ 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
-bfd_target i386coff_vec =
+ return coff_object_p (abfd);
+}
+
+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 */
+ 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),
+
+#ifndef COFF_WITH_PE
+ (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */
+ | SEC_CODE | SEC_DATA),
+#else
+ (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */
+ | SEC_CODE | SEC_DATA
+ | SEC_LINK_ONCE | SEC_LINK_DUPLICATES),
+#endif
- (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 */
- _do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putl16, /* data */
- _do_getl64, _do_putl64, _do_getl32, _do_putl32, _do_getl16, _do_putl16, /* hdrs */
+ 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_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),
+
+ COFF_SWAP_TABLE,
+};
projects / thirdparty / binutils-gdb.git / blobdiff