[thirdparty/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

#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

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