[deliverable/binutils-gdb.git] / bfd / coff-i386.c

/* BFD back-end for Intel 386 COFF files.
   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.

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 "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,               /* 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.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;

/* 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"

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.  */

    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);
}

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,
  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 | 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

#ifdef TARGET_UNDERSCORE
  TARGET_UNDERSCORE,		/* leading underscore */
#else
  0,				/* leading underscore */
#endif
  '/',				/* ar_pad_char */
  15,				/* 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 */

/* 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,
};
Commit	Line	Data
6a469027	1	/* BFD back-end for Intel 386 COFF files.
3ce6d941	2	Copyright 1990, 91, 92, 93, 94, 95, 96, 1997 Free Software Foundation, Inc.
6a469027	3	Written by Cygnus Support.
517496c5	4
6a469027	5	This file is part of BFD, the Binary File Descriptor library.
517496c5	6
6a469027	7	This program is free software; you can redistribute it and/or modify
517496c5	8	it under the terms of the GNU General Public License as published by
6a469027 JG	9	the Free Software Foundation; either version 2 of the License, or
6a469027 JG	10	(at your option) any later version.
517496c5	11
6a469027	12	This program is distributed in the hope that it will be useful,
517496c5 SC	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
6a469027	18	along with this program; if not, write to the Free Software
a5655244	19	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
517496c5	20
517496c5	21	#include "bfd.h"
3b4f1a5d	22	#include "sysdep.h"
517496c5	23	#include "libbfd.h"
89665c85	24
294eaca4	25	#include "coff/i386.h"
89665c85	26
294eaca4	27	#include "coff/internal.h"
89665c85 SC	28
	29	#ifdef COFF_WITH_PE
	30	#include "coff/pe.h"
	31	#endif
	32
179ce6e1 ILT	33	#ifdef COFF_GO32_EXE
	34	#include "coff/go32exe.h"
	35	#endif
	36
517496c5 SC	37	#include "libcoff.h"
517496c5 SC	38
82b1edf7 KR	39	static bfd_reloc_status_type coff_i386_reloc
82b1edf7 KR	40	PARAMS ((bfd , arelent , asymbol , PTR, asection , bfd , char *));
89665c85	41	static reloc_howto_type *coff_i386_rtype_to_howto
82b1edf7 KR	42	PARAMS ((bfd , asection , struct internal_reloc *,
82b1edf7 KR	43	struct coff_link_hash_entry , struct internal_syment ,
89665c85	44
82b1edf7 KR	45	bfd_vma *));
	46
	47	#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
82b1edf7	48	/* The page size is a guess based on ELF. */
a5655244	49
82b1edf7	50	#define COFF_PAGE_SIZE 0x1000
48ee0757 SS	51
	52	/* For some reason when using i386 COFF the value stored in the .text
	53	section for a reference to a common symbol is the value itself plus
	54	any desired offset. Ian Taylor, Cygnus Support. */
	55
	56	/* If we are producing relocateable output, we need to do some
	57	adjustments to the object file that are not done by the
	58	bfd_perform_relocation function. This function is called by every
	59	reloc type to make any required adjustments. */
	60
	61	static bfd_reloc_status_type
6812b607 ILT	62	coff_i386_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,
6812b607 ILT	63	error_message)
48ee0757 SS	64	bfd *abfd;
	65	arelent *reloc_entry;
	66	asymbol *symbol;
	67	PTR data;
	68	asection *input_section;
	69	bfd *output_bfd;
6812b607	70	char **error_message;
48ee0757 SS	71	{
	72	symvalue diff;
	73
	74	if (output_bfd == (bfd *) NULL)
	75	return bfd_reloc_continue;
	76
	77	if (bfd_is_com_section (symbol->section))
	78	{
	79	/* We are relocating a common symbol. The current value in the
	80	object file is ORIG + OFFSET, where ORIG is the value of the
	81	common symbol as seen by the object file when it was compiled
	82	(this may be zero if the symbol was undefined) and OFFSET is
	83	the offset into the common symbol (normally zero, but may be
	84	non-zero when referring to a field in a common structure).
	85	ORIG is the negative of reloc_entry->addend, which is set by
	86	the CALC_ADDEND macro below. We want to replace the value in
	87	the object file with NEW + OFFSET, where NEW is the value of
	88	the common symbol which we are going to put in the final
	89	object file. NEW is symbol->value. */
	90	diff = symbol->value + reloc_entry->addend;
	91	}
	92	else
	93	{
	94	/* For some reason bfd_perform_relocation always effectively
	95	ignores the addend for a COFF target when producing
	96	relocateable output. This seems to be always wrong for 386
	97	COFF, so we handle the addend here instead. */
	98	diff = reloc_entry->addend;
	99	}
	100
a5655244	101	#ifdef COFF_WITH_PE
3ce6d941 ILT	102	/* FIXME: How should this case be handled? */
	103	if (reloc_entry->howto->type == R_IMAGEBASE && diff != 0)
	104	abort ();
a5655244	105	#endif
48ee0757	106
a5655244 ILT	107	#define DOIT(x) \
a5655244 ILT	108	x = ((x & ~howto->dst_mask) \| (((x & howto->src_mask) + diff) & howto->dst_mask))
48ee0757	109
a5655244 ILT	110	if (diff != 0)
	111	{
	112	reloc_howto_type *howto = reloc_entry->howto;
	113	unsigned char addr = (unsigned char ) data + reloc_entry->address;
48ee0757	114
a5655244	115	switch (howto->size)
48ee0757	116	{
a5655244 ILT	117	case 0:
	118	{
	119	char x = bfd_get_8 (abfd, addr);
	120	DOIT (x);
	121	bfd_put_8 (abfd, x, addr);
	122	}
	123	break;
	124
	125	case 1:
	126	{
	127	short x = bfd_get_16 (abfd, addr);
	128	DOIT (x);
	129	bfd_put_16 (abfd, x, addr);
	130	}
	131	break;
	132
	133	case 2:
	134	{
	135	long x = bfd_get_32 (abfd, addr);
	136	DOIT (x);
	137	bfd_put_32 (abfd, x, addr);
	138	}
	139	break;
	140
	141	default:
	142	abort ();
48ee0757	143	}
a5655244	144	}
48ee0757 SS	145
	146	/* Now let bfd_perform_relocation finish everything up. */
	147	return bfd_reloc_continue;
	148	}
517496c5	149
3ce6d941 ILT	150	#ifdef COFF_WITH_PE
	151	/* Return true if this relocation should
	152	appear in the output .reloc section. */
89665c85	153
3ce6d941 ILT	154	static boolean in_reloc_p(abfd, howto)
	155	bfd * abfd;
	156	reloc_howto_type *howto;
	157	{
	158	return ! howto->pc_relative && howto->type != R_IMAGEBASE;
	159	}
	160	#endif
89665c85 SC	161
	162	#ifndef PCRELOFFSET
	163	#define PCRELOFFSET false
	164	#endif
	165
517496c5 SC	166	static reloc_howto_type howto_table[] =
517496c5 SC	167	{
48ee0757 SS	168	{0},
	169	{1},
	170	{2},
	171	{3},
	172	{4},
	173	{5},
	174	HOWTO (R_DIR32, /* type */
89665c85 SC	175	0, /* rightshift */
	176	2, /* size (0 = byte, 1 = short, 2 = long) */
	177	32, /* bitsize */
	178	false, /* pc_relative */
	179	0, /* bitpos */
	180	complain_overflow_bitfield, /* complain_on_overflow */
	181	coff_i386_reloc, /* special_function */
	182	"dir32", /* name */
	183	true, /* partial_inplace */
	184	0xffffffff, /* src_mask */
	185	0xffffffff, /* dst_mask */
	186	true), /* pcrel_offset */
	187	/* {7}, */
a5655244	188	HOWTO (R_IMAGEBASE, /* type */
48ee0757 SS	189	0, /* rightshift */
	190	2, /* size (0 = byte, 1 = short, 2 = long) */
	191	32, /* bitsize */
	192	false, /* pc_relative */
	193	0, /* bitpos */
	194	complain_overflow_bitfield, /* complain_on_overflow */
	195	coff_i386_reloc, /* special_function */
a5655244	196	"rva32", /* name */
48ee0757 SS	197	true, /* partial_inplace */
	198	0xffffffff, /* src_mask */
	199	0xffffffff, /* dst_mask */
	200	false), /* pcrel_offset */
48ee0757 SS	201	{010},
	202	{011},
	203	{012},
	204	{013},
	205	{014},
	206	{015},
	207	{016},
	208	HOWTO (R_RELBYTE, /* type */
	209	0, /* rightshift */
	210	0, /* size (0 = byte, 1 = short, 2 = long) */
	211	8, /* bitsize */
	212	false, /* pc_relative */
	213	0, /* bitpos */
	214	complain_overflow_bitfield, /* complain_on_overflow */
	215	coff_i386_reloc, /* special_function */
	216	"8", /* name */
	217	true, /* partial_inplace */
	218	0x000000ff, /* src_mask */
	219	0x000000ff, /* dst_mask */
89665c85	220	PCRELOFFSET), /* pcrel_offset */
48ee0757 SS	221	HOWTO (R_RELWORD, /* type */
	222	0, /* rightshift */
	223	1, /* size (0 = byte, 1 = short, 2 = long) */
	224	16, /* bitsize */
	225	false, /* pc_relative */
	226	0, /* bitpos */
	227	complain_overflow_bitfield, /* complain_on_overflow */
	228	coff_i386_reloc, /* special_function */
	229	"16", /* name */
	230	true, /* partial_inplace */
	231	0x0000ffff, /* src_mask */
	232	0x0000ffff, /* dst_mask */
89665c85	233	PCRELOFFSET), /* pcrel_offset */
48ee0757 SS	234	HOWTO (R_RELLONG, /* type */
	235	0, /* rightshift */
	236	2, /* size (0 = byte, 1 = short, 2 = long) */
	237	32, /* bitsize */
	238	false, /* pc_relative */
	239	0, /* bitpos */
	240	complain_overflow_bitfield, /* complain_on_overflow */
	241	coff_i386_reloc, /* special_function */
	242	"32", /* name */
	243	true, /* partial_inplace */
	244	0xffffffff, /* src_mask */
	245	0xffffffff, /* dst_mask */
89665c85	246	PCRELOFFSET), /* pcrel_offset */
48ee0757 SS	247	HOWTO (R_PCRBYTE, /* type */
	248	0, /* rightshift */
	249	0, /* size (0 = byte, 1 = short, 2 = long) */
	250	8, /* bitsize */
	251	true, /* pc_relative */
	252	0, /* bitpos */
	253	complain_overflow_signed, /* complain_on_overflow */
	254	coff_i386_reloc, /* special_function */
	255	"DISP8", /* name */
	256	true, /* partial_inplace */
	257	0x000000ff, /* src_mask */
	258	0x000000ff, /* dst_mask */
89665c85	259	PCRELOFFSET), /* pcrel_offset */
48ee0757 SS	260	HOWTO (R_PCRWORD, /* type */
	261	0, /* rightshift */
	262	1, /* size (0 = byte, 1 = short, 2 = long) */
	263	16, /* bitsize */
	264	true, /* pc_relative */
	265	0, /* bitpos */
	266	complain_overflow_signed, /* complain_on_overflow */
	267	coff_i386_reloc, /* special_function */
	268	"DISP16", /* name */
	269	true, /* partial_inplace */
	270	0x0000ffff, /* src_mask */
	271	0x0000ffff, /* dst_mask */
89665c85	272	PCRELOFFSET), /* pcrel_offset */
48ee0757 SS	273	HOWTO (R_PCRLONG, /* type */
	274	0, /* rightshift */
	275	2, /* size (0 = byte, 1 = short, 2 = long) */
	276	32, /* bitsize */
	277	true, /* pc_relative */
	278	0, /* bitpos */
	279	complain_overflow_signed, /* complain_on_overflow */
	280	coff_i386_reloc, /* special_function */
	281	"DISP32", /* name */
	282	true, /* partial_inplace */
	283	0xffffffff, /* src_mask */
	284	0xffffffff, /* dst_mask */
89665c85	285	PCRELOFFSET) /* pcrel_offset */
517496c5 SC	286	};
517496c5 SC	287
517496c5 SC	288	/* Turn a howto into a reloc nunmber */
517496c5 SC	289
6812b607	290	#define SELECT_RELOC(x,howto) { x.r_type = howto->type; }
517496c5	291	#define BADMAG(x) I386BADMAG(x)
3b4f1a5d SC	292	#define I386 1 /* Customize coffcode.h */
3b4f1a5d SC	293
c9301d7b	294	#define RTYPE2HOWTO(cache_ptr, dst) \
82b1edf7	295	(cache_ptr)->howto = howto_table + (dst)->r_type;
3b4f1a5d	296
48ee0757 SS	297	/* For 386 COFF a STYP_NOLOAD \| STYP_BSS section is part of a shared
	298	library. On some other COFF targets STYP_BSS is normally
	299	STYP_NOLOAD. */
	300	#define BSS_NOLOAD_IS_SHARED_LIBRARY
517496c5	301
48ee0757 SS	302	/* Compute the addend of a reloc. If the reloc is to a common symbol,
	303	the object file contains the value of the common symbol. By the
	304	time this is called, the linker may be using a different symbol
	305	from a different object file with a different value. Therefore, we
	306	hack wildly to locate the original symbol from this file so that we
	307	can make the correct adjustment. This macro sets coffsym to the
	308	symbol from the original file, and uses it to set the addend value
	309	correctly. If this is not a common symbol, the usual addend
	310	calculation is done, except that an additional tweak is needed for
	311	PC relative relocs.
	312	FIXME: This macro refers to symbols and asect; these are from the
	313	calling function, not the macro arguments. */
	314
	315	#define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
	316	{ \
	317	coff_symbol_type coffsym = (coff_symbol_type ) NULL; \
	318	if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
	319	coffsym = (obj_symbols (abfd) \
	320	+ (cache_ptr->sym_ptr_ptr - symbols)); \
	321	else if (ptr) \
	322	coffsym = coff_symbol_from (abfd, ptr); \
	323	if (coffsym != (coff_symbol_type *) NULL \
	324	&& coffsym->native->u.syment.n_scnum == 0) \
	325	cache_ptr->addend = - coffsym->native->u.syment.n_value; \
	326	else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
	327	&& ptr->section != (asection *) NULL) \
	328	cache_ptr->addend = - (ptr->section->vma + ptr->value); \
	329	else \
	330	cache_ptr->addend = 0; \
	331	if (ptr && howto_table[reloc.r_type].pc_relative) \
	332	cache_ptr->addend += asect->vma; \
	333	}
	334
82b1edf7 KR	335	/* We use the special COFF backend linker. */
	336	#define coff_relocate_section _bfd_coff_generic_relocate_section
	337
89665c85	338	static reloc_howto_type *
82b1edf7 KR	339	coff_i386_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
	340	bfd *abfd;
	341	asection *sec;
	342	struct internal_reloc *rel;
	343	struct coff_link_hash_entry *h;
	344	struct internal_syment *sym;
	345	bfd_vma *addendp;
	346	{
89665c85 SC	347
89665c85 SC	348	reloc_howto_type *howto;
82b1edf7 KR	349
	350	howto = howto_table + rel->r_type;
	351
89665c85 SC	352	#ifdef COFF_WITH_PE
	353	*addendp = 0;
	354	#endif
	355
82b1edf7 KR	356	if (howto->pc_relative)
	357	*addendp += sec->vma;
	358
	359	if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
	360	{
	361	/* This is a common symbol. The section contents include the
	362	size (sym->n_value) as an addend. The relocate_section
	363	function will be adding in the final value of the symbol. We
	364	need to subtract out the current size in order to get the
	365	correct result. */
89665c85	366
82b1edf7	367	BFD_ASSERT (h != NULL);
89665c85 SC	368
	369
	370	#ifndef COFF_WITH_PE
a5655244 ILT	371	/* I think we do want to bypass this. If we don't, I have seen some data
	372	parameters get the wrong relcation address. If I link two versions
	373	with and without this section bypassed and then do a binary comparison,
	374	the addresses which are different can be looked up in the map. The
	375	case in which this section has been bypassed has addresses which correspond
	376	to values I can find in the map */
82b1edf7	377	*addendp -= sym->n_value;
89665c85	378	#endif
82b1edf7 KR	379	}
	380
	381	/* If the output symbol is common (in which case this must be a
	382	relocateable link), we need to add in the final size of the
	383	common symbol. */
89665c85	384	if (h != NULL && h->root.type == bfd_link_hash_common)
82b1edf7 KR	385	*addendp += h->root.u.c.size;
82b1edf7 KR	386
89665c85 SC	387
	388	#ifdef COFF_WITH_PE
	389	if (howto->pc_relative)
a5655244 ILT	390	*addendp -= 4;
	391
	392	if (rel->r_type == R_IMAGEBASE)
	393	{
	394	*addendp -= pe_data(sec->output_section->owner)->pe_opthdr.ImageBase;
	395	}
89665c85 SC	396	#endif
89665c85 SC	397
82b1edf7 KR	398	return howto;
	399	}
	400
3ce6d941 ILT	401
	402	#define coff_bfd_reloc_type_lookup coff_i386_reloc_type_lookup
	403
	404
	405	static reloc_howto_type *
	406	coff_i386_reloc_type_lookup (abfd, code)
	407	bfd *abfd;
	408	bfd_reloc_code_real_type code;
	409	{
	410	switch (code)
	411	{
	412	case BFD_RELOC_RVA:
	413	return howto_table +R_IMAGEBASE;
	414	case BFD_RELOC_32:
	415	return howto_table + R_DIR32;
	416	case BFD_RELOC_32_PCREL:
	417	return howto_table + R_PCRLONG;
	418	default:
	419	BFD_FAIL ();
	420	return 0;
	421	}
	422	}
	423
40496096	424	#define coff_rtype_to_howto coff_i386_rtype_to_howto
3ce6d941	425
40496096	426	#ifdef TARGET_UNDERSCORE
3ce6d941	427
40496096 ILT	428	/* If i386 gcc uses underscores for symbol names, then it does not use
	429	a leading dot for local labels, so if TARGET_UNDERSCORE is defined
	430	we treat all symbols starting with L as local. */
	431
	432	static boolean coff_i386_is_local_label_name PARAMS ((bfd , const char ));
	433
	434	static boolean
	435	coff_i386_is_local_label_name (abfd, name)
	436	bfd *abfd;
	437	const char *name;
	438	{
	439	if (name[0] == 'L')
	440	return true;
	441
	442	return _bfd_coff_is_local_label_name (abfd, name);
	443	}
	444
	445	#define coff_bfd_is_local_label_name coff_i386_is_local_label_name
	446
	447	#endif /* TARGET_UNDERSCORE */
82b1edf7	448
48ee0757	449	#include "coffcode.h"
517496c5	450
82b1edf7	451	static const bfd_target *
3ce6d941 ILT	452	i3coff_object_p (abfd)
3ce6d941 ILT	453	bfd *abfd;
cbd8493e	454	{
3ce6d941 ILT	455	#ifdef COFF_IMAGE_WITH_PE
	456	/* We need to hack badly to handle a PE image correctly. In PE
	457	images created by the GNU linker, the offset to the COFF header
	458	is always the size. However, this is not the case in images
	459	generated by other PE linkers. The PE format stores a four byte
	460	offset to the PE signature just before the COFF header at
	461	location 0x3c of the file. We pick up that offset, verify that
	462	the PE signature is there, and then set ourselves up to read in
	463	the COFF header. */
	464	{
	465	bfd_byte ext_offset[4];
	466	file_ptr offset;
	467	bfd_byte ext_signature[4];
	468	unsigned long signature;
	469
	470	if (bfd_seek (abfd, 0x3c, SEEK_SET) != 0
	471	\|\| bfd_read (ext_offset, 1, 4, abfd) != 4)
	472	{
	473	if (bfd_get_error () != bfd_error_system_call)
	474	bfd_set_error (bfd_error_wrong_format);
	475	return NULL;
	476	}
	477	offset = bfd_h_get_32 (abfd, ext_offset);
	478	if (bfd_seek (abfd, offset, SEEK_SET) != 0
	479	\|\| bfd_read (ext_signature, 1, 4, abfd) != 4)
	480	{
	481	if (bfd_get_error () != bfd_error_system_call)
	482	bfd_set_error (bfd_error_wrong_format);
	483	return NULL;
	484	}
	485	signature = bfd_h_get_32 (abfd, ext_signature);
	486
	487	if (signature != 0x4550)
	488	{
	489	bfd_set_error (bfd_error_wrong_format);
	490	return NULL;
	491	}
	492
	493	/* Here is the hack. coff_object_p wants to read filhsz bytes to
	494	pick up the COFF header. We adjust so that that will work. 20
	495	is the size of the i386 COFF filehdr. */
	496
	497	if (bfd_seek (abfd,
	498	(bfd_tell (abfd)
	499	- bfd_coff_filhsz (abfd)
	500	+ 20),
	501	SEEK_SET)
	502	!= 0)
	503	{
	504	if (bfd_get_error () != bfd_error_system_call)
	505	bfd_set_error (bfd_error_wrong_format);
	506	return NULL;
	507	}
	508	}
	509	#endif
	510
	511	return coff_object_p (abfd);
cbd8493e	512	}
517496c5	513
82b1edf7	514	const bfd_target
48ee0757 SS	515	#ifdef TARGET_SYM
	516	TARGET_SYM =
	517	#else
	518	i386coff_vec =
	519	#endif
517496c5	520	{
48ee0757 SS	521	#ifdef TARGET_NAME
	522	TARGET_NAME,
	523	#else
3b4f1a5d	524	"coff-i386", /* name */
48ee0757	525	#endif
6a469027	526	bfd_target_coff_flavour,
3ce6d941 ILT	527	BFD_ENDIAN_LITTLE, /* data byte order is little */
3ce6d941 ILT	528	BFD_ENDIAN_LITTLE, /* header byte order is little */
517496c5 SC	529
	530	(HAS_RELOC \| EXEC_P \| /* object flags */
	531	HAS_LINENO \| HAS_DEBUG \|
82b1edf7	532	HAS_SYMS \| HAS_LOCALS \| WP_TEXT \| D_PAGED),
517496c5	533
3ce6d941	534	#ifndef COFF_WITH_PE
40496096 ILT	535	(SEC_HAS_CONTENTS \| SEC_ALLOC \| SEC_LOAD \| SEC_RELOC /* section flags */
40496096 ILT	536	\| SEC_CODE \| SEC_DATA),
3ce6d941 ILT	537	#else
3ce6d941 ILT	538	(SEC_HAS_CONTENTS \| SEC_ALLOC \| SEC_LOAD \| SEC_RELOC /* section flags */
40496096	539	\| SEC_CODE \| SEC_DATA
3ce6d941 ILT	540	\| SEC_LINK_ONCE \| SEC_LINK_DUPLICATES),
	541	#endif
	542
82b1edf7 KR	543	#ifdef TARGET_UNDERSCORE
	544	TARGET_UNDERSCORE, /* leading underscore */
	545	#else
294eaca4	546	0, /* leading underscore */
82b1edf7	547	#endif
517496c5 SC	548	'/', /* ar_pad_char */
	549	15, /* ar_max_namelen */
	550
48ee0757 SS	551	bfd_getl64, bfd_getl_signed_64, bfd_putl64,
	552	bfd_getl32, bfd_getl_signed_32, bfd_putl32,
	553	bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
	554	bfd_getl64, bfd_getl_signed_64, bfd_putl64,
	555	bfd_getl32, bfd_getl_signed_32, bfd_putl32,
	556	bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
517496c5	557
6a469027 JG	558	/* Note that we allow an object file to be treated as a core file as well. */
	559	{_bfd_dummy_target, i3coff_object_p, /* bfd_check_format */
	560	bfd_generic_archive_p, i3coff_object_p},
	561	{bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */
	562	bfd_false},
	563	{bfd_false, coff_write_object_contents, /* bfd_write_contents */
	564	_bfd_write_archive_contents, bfd_false},
517496c5	565
6812b607 ILT	566	BFD_JUMP_TABLE_GENERIC (coff),
	567	BFD_JUMP_TABLE_COPY (coff),
	568	BFD_JUMP_TABLE_CORE (_bfd_nocore),
	569	BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),
	570	BFD_JUMP_TABLE_SYMBOLS (coff),
	571	BFD_JUMP_TABLE_RELOCS (coff),
	572	BFD_JUMP_TABLE_WRITE (coff),
	573	BFD_JUMP_TABLE_LINK (coff),
82b1edf7	574	BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
6812b607	575
48ee0757 SS	576	COFF_SWAP_TABLE,
48ee0757 SS	577	};