[binutils.git] / bfd / coff-m68k.c

/* BFD back-end for Motorola 68000 COFF binaries.
   Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 1999
   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/m68k.h"
#include "coff/internal.h"
#include "libcoff.h"

/* This source file is compiled multiple times for various m68k COFF
   variants.  The following macros control its behaviour:

   TARGET_SYM
     The C name of the BFD target vector.  The default is m68kcoff_vec.
   TARGET_NAME
     The user visible target name.  The default is "coff-m68k".
   NAMES_HAVE_UNDERSCORE
     Whether symbol names have an underscore.
   ONLY_DECLARE_RELOCS
     Only declare the relocation howto array.  Don't actually compile
     it.  The actual array will be picked up in another version of the
     file.
   STATIC_RELOCS
     Make the relocation howto array, and associated functions, static.
   COFF_COMMON_ADDEND
     If this is defined, then, for a relocation against a common
     symbol, the object file holds the value (the size) of the common
     symbol.  If this is not defined, then, for a relocation against a
     common symbol, the object file holds zero.  */

#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)

#ifndef COFF_PAGE_SIZE
/* The page size is a guess based on ELF.  */
#define COFF_PAGE_SIZE 0x2000
#endif

#ifndef COFF_COMMON_ADDEND
#define RELOC_SPECIAL_FN 0
#else
static bfd_reloc_status_type m68kcoff_common_addend_special_fn
  PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static reloc_howto_type *m68kcoff_common_addend_rtype_to_howto
  PARAMS ((bfd *, asection *, struct internal_reloc *,
	   struct coff_link_hash_entry *, struct internal_syment *,
	   bfd_vma *));
#define RELOC_SPECIAL_FN m68kcoff_common_addend_special_fn
#endif

static boolean m68k_coff_is_local_label_name PARAMS ((bfd *, const char *));

/* On the delta, a symbol starting with L% is local.  We won't see
   such a symbol on other platforms, so it should be safe to always
   consider it local here.  */

static boolean
m68k_coff_is_local_label_name (abfd, name)
     bfd *abfd;
     const char *name;
{
  if (name[0] == 'L' && name[1] == '%')
    return true;

  return _bfd_coff_is_local_label_name (abfd, name);
}

#ifndef STATIC_RELOCS
/* Clean up namespace.  */
#define m68kcoff_howto_table	_bfd_m68kcoff_howto_table
#define m68k_rtype2howto	_bfd_m68kcoff_rtype2howto
#define m68k_howto2rtype	_bfd_m68kcoff_howto2rtype
#define m68k_reloc_type_lookup	_bfd_m68kcoff_reloc_type_lookup
#endif

#ifdef ONLY_DECLARE_RELOCS
extern reloc_howto_type m68kcoff_howto_table[];
#else
#ifdef STATIC_RELOCS
static
#endif
reloc_howto_type m68kcoff_howto_table[] = 
{
  HOWTO(R_RELBYTE,	       0,  0,  	8,  false, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "8",	true, 0x000000ff,0x000000ff, false),
  HOWTO(R_RELWORD,	       0,  1, 	16, false, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "16",	true, 0x0000ffff,0x0000ffff, false),
  HOWTO(R_RELLONG,	       0,  2, 	32, false, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "32",	true, 0xffffffff,0xffffffff, false),
  HOWTO(R_PCRBYTE,	       0,  0, 	8,  true,  0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP8",    true, 0x000000ff,0x000000ff, false),
  HOWTO(R_PCRWORD,	       0,  1, 	16, true,  0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP16",   true, 0x0000ffff,0x0000ffff, false),
  HOWTO(R_PCRLONG,	       0,  2, 	32, true,  0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP32",   true, 0xffffffff,0xffffffff, false),
  HOWTO(R_RELLONG_NEG,	       0,  -2, 	32, false, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "-32",	true, 0xffffffff,0xffffffff, false),
};
#endif /* not ONLY_DECLARE_RELOCS */

#ifndef BADMAG
#define BADMAG(x) M68KBADMAG(x)
#endif
#define M68 1		/* Customize coffcode.h */

/* Turn a howto into a reloc number */

#ifdef ONLY_DECLARE_RELOCS
extern void m68k_rtype2howto PARAMS ((arelent *internal, int relocentry));
extern int m68k_howto2rtype PARAMS ((reloc_howto_type *));
extern reloc_howto_type *m68k_reloc_type_lookup
  PARAMS ((bfd *, bfd_reloc_code_real_type));
#else
#ifdef STATIC_RELOCS
static
#endif
void
m68k_rtype2howto(internal, relocentry)
     arelent *internal;
     int relocentry;
{
  switch (relocentry) 
  {
   case R_RELBYTE:	internal->howto = m68kcoff_howto_table + 0; break;
   case R_RELWORD:	internal->howto = m68kcoff_howto_table + 1; break;
   case R_RELLONG:	internal->howto = m68kcoff_howto_table + 2; break;
   case R_PCRBYTE:	internal->howto = m68kcoff_howto_table + 3; break;
   case R_PCRWORD:	internal->howto = m68kcoff_howto_table + 4; break;
   case R_PCRLONG:	internal->howto = m68kcoff_howto_table + 5; break;
   case R_RELLONG_NEG:	internal->howto = m68kcoff_howto_table + 6; break;
  }
}

#ifdef STATIC_RELOCS
static
#endif
int 
m68k_howto2rtype (internal)
     reloc_howto_type *internal;
{
  if (internal->pc_relative) 
  {
    switch (internal->bitsize) 
    {
     case 32: return R_PCRLONG;
     case 16: return R_PCRWORD;
     case 8: return R_PCRBYTE;
    }
  }
  else 
  {
    switch (internal->bitsize) 
     {
      case 32: return R_RELLONG;
      case 16: return R_RELWORD;
      case 8: return R_RELBYTE;
     }
  }
  return R_RELLONG;    
}

#ifdef STATIC_RELOCS
static
#endif
reloc_howto_type *
m68k_reloc_type_lookup (abfd, code)
     bfd *abfd ATTRIBUTE_UNUSED;
     bfd_reloc_code_real_type code;
{
  switch (code)
    {
    default:			return NULL;
    case BFD_RELOC_8:		return m68kcoff_howto_table + 0;
    case BFD_RELOC_16:		return m68kcoff_howto_table + 1;
    case BFD_RELOC_CTOR:
    case BFD_RELOC_32:		return m68kcoff_howto_table + 2;
    case BFD_RELOC_8_PCREL:	return m68kcoff_howto_table + 3;
    case BFD_RELOC_16_PCREL:	return m68kcoff_howto_table + 4;
    case BFD_RELOC_32_PCREL:	return m68kcoff_howto_table + 5;
      /* FIXME: There doesn't seem to be a code for R_RELLONG_NEG.  */
    }
  /*NOTREACHED*/
}

#endif /* not ONLY_DECLARE_RELOCS */

#define RTYPE2HOWTO(internal, relocentry) \
  m68k_rtype2howto(internal, (relocentry)->r_type)

#define SELECT_RELOC(external, internal) \
  external.r_type = m68k_howto2rtype (internal)

#define coff_bfd_reloc_type_lookup m68k_reloc_type_lookup

#ifndef COFF_COMMON_ADDEND
#ifndef coff_rtype_to_howto

#define coff_rtype_to_howto m68kcoff_rtype_to_howto

static reloc_howto_type *m68kcoff_rtype_to_howto
  PARAMS ((bfd *, asection *, struct internal_reloc *,
	   struct coff_link_hash_entry *, struct internal_syment *,
	   bfd_vma *));

/*ARGSUSED*/
static reloc_howto_type *
m68kcoff_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
     bfd *abfd ATTRIBUTE_UNUSED;
     asection *sec;
     struct internal_reloc *rel;
     struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
     struct internal_syment *sym ATTRIBUTE_UNUSED;
     bfd_vma *addendp;
{
  arelent relent;
  reloc_howto_type *howto;

  RTYPE2HOWTO (&relent, rel);

  howto = relent.howto;

  if (howto->pc_relative)
    *addendp += sec->vma;

  return howto;
}

#endif /* ! defined (coff_rtype_to_howto) */
#endif /* ! defined (COFF_COMMON_ADDEND) */
\f
#ifdef COFF_COMMON_ADDEND

/* If COFF_COMMON_ADDEND is defined, then when using m68k COFF the
   value stored in the .text section for a reference to a common
   symbol is the value itself plus any desired offset.  (taken from
   work done by Ian Taylor, Cygnus Support, for I386 COFF).  */

/* 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
m68kcoff_common_addend_special_fn (abfd, reloc_entry, symbol, data,
				   input_section, output_bfd, error_message)
     bfd *abfd;
     arelent *reloc_entry;
     asymbol *symbol;
     PTR data;
     asection *input_section ATTRIBUTE_UNUSED;
     bfd *output_bfd;
     char **error_message ATTRIBUTE_UNUSED;
{
  symvalue diff;

  if (output_bfd == (bfd *) NULL)
    return bfd_reloc_continue;

  if (bfd_is_com_section (symbol->section))
    {
      /* We are relocating a common symbol.  The current value in the
	 object file is ORIG + OFFSET, where ORIG is the value of the
	 common symbol as seen by the object file when it was compiled
	 (this may be zero if the symbol was undefined) and OFFSET is
	 the offset into the common symbol (normally zero, but may be
	 non-zero when referring to a field in a common structure).
	 ORIG is the negative of reloc_entry->addend, which is set by
	 the CALC_ADDEND macro below.  We want to replace the value in
	 the object file with NEW + OFFSET, where NEW is the value of
	 the common symbol which we are going to put in the final
	 object file.  NEW is symbol->value.  */
      diff = symbol->value + reloc_entry->addend;
    }
  else
    {
      /* For some reason bfd_perform_relocation always effectively
	 ignores the addend for a COFF target when producing
	 relocateable output.  This seems to be always wrong for 386
	 COFF, so we handle the addend here instead.  */
      diff = reloc_entry->addend;
    }

#define DOIT(x) \
  x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))

  if (diff != 0)
    {
      reloc_howto_type *howto = reloc_entry->howto;
      unsigned char *addr = (unsigned char *) data + reloc_entry->address;

      switch (howto->size)
	{
	case 0:
	  {
	    char x = bfd_get_8 (abfd, addr);
	    DOIT (x);
	    bfd_put_8 (abfd, x, addr);
	  }
	  break;

	case 1:
	  {
	    short x = bfd_get_16 (abfd, addr);
	    DOIT (x);
	    bfd_put_16 (abfd, x, addr);
	  }
	  break;

	case 2:
	  {
	    long x = bfd_get_32 (abfd, addr);
	    DOIT (x);
	    bfd_put_32 (abfd, x, addr);
	  }
	  break;

	default:
	  abort ();
	}
    }

  /* Now let bfd_perform_relocation finish everything up.  */
  return bfd_reloc_continue;
}

/* 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 && (reloc.r_type == R_PCRBYTE			\
		|| reloc.r_type == R_PCRWORD			\
		|| reloc.r_type == R_PCRLONG))			\
      cache_ptr->addend += asect->vma;				\
  }

#ifndef coff_rtype_to_howto

/* coff-m68k.c uses the special COFF backend linker.  We need to
   adjust common symbols.  */

/*ARGSUSED*/
static reloc_howto_type *
m68kcoff_common_addend_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
     bfd *abfd ATTRIBUTE_UNUSED;
     asection *sec;
     struct internal_reloc *rel;
     struct coff_link_hash_entry *h;
     struct internal_syment *sym;
     bfd_vma *addendp;
{
  arelent relent;
  reloc_howto_type *howto;

  RTYPE2HOWTO (&relent, rel);

  howto = relent.howto;

  if (howto->pc_relative)
    *addendp += sec->vma;

  if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
    {
      /* This is a common symbol.  The section contents include the
	 size (sym->n_value) as an addend.  The relocate_section
	 function will be adding in the final value of the symbol.  We
	 need to subtract out the current size in order to get the
	 correct result.  */
      BFD_ASSERT (h != NULL);
      *addendp -= sym->n_value;
    }

  /* If the output symbol is common (in which case this must be a
     relocateable link), we need to add in the final size of the
     common symbol.  */
  if (h != NULL && h->root.type == bfd_link_hash_common)
    *addendp += h->root.u.c.size;

  return howto;
}

#define coff_rtype_to_howto m68kcoff_common_addend_rtype_to_howto

#endif /* ! defined (coff_rtype_to_howto) */

#endif /* COFF_COMMON_ADDEND */
\f
#define coff_bfd_is_local_label_name m68k_coff_is_local_label_name

#define coff_relocate_section _bfd_coff_generic_relocate_section

#include "coffcode.h"

#ifndef TARGET_SYM
#define TARGET_SYM m68kcoff_vec
#endif

#ifndef TARGET_NAME
#define TARGET_NAME "coff-m68k"
#endif

#ifdef NAMES_HAVE_UNDERSCORE
CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, '_', NULL)
#else
CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, 0, NULL)
#endif
Commit	Line	Data
252b5132	1	/* BFD back-end for Motorola 68000 COFF binaries.
5f771d47 ILT	2	Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 1999
5f771d47 ILT	3	Free Software Foundation, Inc.
252b5132 RH	4	Written by Cygnus Support.
	5
	6	This file is part of BFD, the Binary File Descriptor library.
	7
	8	This program is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with this program; if not, write to the Free Software
	20	Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
	21
	22	#include "bfd.h"
	23	#include "sysdep.h"
	24	#include "libbfd.h"
	25	#include "coff/m68k.h"
	26	#include "coff/internal.h"
	27	#include "libcoff.h"
	28
	29	/* This source file is compiled multiple times for various m68k COFF
	30	variants. The following macros control its behaviour:
	31
	32	TARGET_SYM
	33	The C name of the BFD target vector. The default is m68kcoff_vec.
	34	TARGET_NAME
	35	The user visible target name. The default is "coff-m68k".
	36	NAMES_HAVE_UNDERSCORE
	37	Whether symbol names have an underscore.
	38	ONLY_DECLARE_RELOCS
	39	Only declare the relocation howto array. Don't actually compile
	40	it. The actual array will be picked up in another version of the
	41	file.
	42	STATIC_RELOCS
	43	Make the relocation howto array, and associated functions, static.
	44	COFF_COMMON_ADDEND
	45	If this is defined, then, for a relocation against a common
	46	symbol, the object file holds the value (the size) of the common
	47	symbol. If this is not defined, then, for a relocation against a
	48	common symbol, the object file holds zero. */
	49
	50	#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
	51
	52	#ifndef COFF_PAGE_SIZE
	53	/* The page size is a guess based on ELF. */
	54	#define COFF_PAGE_SIZE 0x2000
	55	#endif
	56
	57	#ifndef COFF_COMMON_ADDEND
	58	#define RELOC_SPECIAL_FN 0
	59	#else
	60	static bfd_reloc_status_type m68kcoff_common_addend_special_fn
	61	PARAMS ((bfd , arelent , asymbol , PTR, asection , bfd , char *));
	62	static reloc_howto_type *m68kcoff_common_addend_rtype_to_howto
	63	PARAMS ((bfd , asection , struct internal_reloc *,
	64	struct coff_link_hash_entry , struct internal_syment ,
	65	bfd_vma *));
	66	#define RELOC_SPECIAL_FN m68kcoff_common_addend_special_fn
	67	#endif
68
69	static boolean m68k_coff_is_local_label_name PARAMS ((bfd , const char ));
70
71	/* On the delta, a symbol starting with L% is local. We won't see
72	such a symbol on other platforms, so it should be safe to always
73	consider it local here. */
74
75	static boolean
76	m68k_coff_is_local_label_name (abfd, name)
77	bfd *abfd;
78	const char *name;
79	{
80	if (name[0] == 'L' && name[1] == '%')
81	return true;
82
83	return _bfd_coff_is_local_label_name (abfd, name);
84	}
85
86	#ifndef STATIC_RELOCS
87	/* Clean up namespace. */
88	#define m68kcoff_howto_table _bfd_m68kcoff_howto_table
89	#define m68k_rtype2howto _bfd_m68kcoff_rtype2howto
90	#define m68k_howto2rtype _bfd_m68kcoff_howto2rtype
91	#define m68k_reloc_type_lookup _bfd_m68kcoff_reloc_type_lookup
92	#endif
93
94	#ifdef ONLY_DECLARE_RELOCS
95	extern reloc_howto_type m68kcoff_howto_table[];
96	#else
97	#ifdef STATIC_RELOCS
98	static
99	#endif
100	reloc_howto_type m68kcoff_howto_table[] =
101	{
102	HOWTO(R_RELBYTE, 0, 0, 8, false, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "8", true, 0x000000ff,0x000000ff, false),
103	HOWTO(R_RELWORD, 0, 1, 16, false, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "16", true, 0x0000ffff,0x0000ffff, false),
104	HOWTO(R_RELLONG, 0, 2, 32, false, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "32", true, 0xffffffff,0xffffffff, false),
105	HOWTO(R_PCRBYTE, 0, 0, 8, true, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP8", true, 0x000000ff,0x000000ff, false),
106	HOWTO(R_PCRWORD, 0, 1, 16, true, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP16", true, 0x0000ffff,0x0000ffff, false),
107	HOWTO(R_PCRLONG, 0, 2, 32, true, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP32", true, 0xffffffff,0xffffffff, false),
108	HOWTO(R_RELLONG_NEG, 0, -2, 32, false, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "-32", true, 0xffffffff,0xffffffff, false),
109	};
110	#endif /* not ONLY_DECLARE_RELOCS */
111
112	#ifndef BADMAG
113	#define BADMAG(x) M68KBADMAG(x)
114	#endif
115	#define M68 1 /* Customize coffcode.h */
116
117	/* Turn a howto into a reloc number */
118
119	#ifdef ONLY_DECLARE_RELOCS
120	extern void m68k_rtype2howto PARAMS ((arelent *internal, int relocentry));
121	extern int m68k_howto2rtype PARAMS ((reloc_howto_type *));
122	extern reloc_howto_type *m68k_reloc_type_lookup
123	PARAMS ((bfd *, bfd_reloc_code_real_type));
124	#else
125	#ifdef STATIC_RELOCS
126	static
127	#endif
128	void
129	m68k_rtype2howto(internal, relocentry)
130	arelent *internal;
131	int relocentry;
132	{
133	switch (relocentry)
134	{
135	case R_RELBYTE: internal->howto = m68kcoff_howto_table + 0; break;
136	case R_RELWORD: internal->howto = m68kcoff_howto_table + 1; break;
137	case R_RELLONG: internal->howto = m68kcoff_howto_table + 2; break;
138	case R_PCRBYTE: internal->howto = m68kcoff_howto_table + 3; break;
139	case R_PCRWORD: internal->howto = m68kcoff_howto_table + 4; break;
140	case R_PCRLONG: internal->howto = m68kcoff_howto_table + 5; break;
141	case R_RELLONG_NEG: internal->howto = m68kcoff_howto_table + 6; break;
142	}
143	}
144
145	#ifdef STATIC_RELOCS
146	static
147	#endif
148	int
149	m68k_howto2rtype (internal)
150	reloc_howto_type *internal;
151	{
152	if (internal->pc_relative)
153	{
154	switch (internal->bitsize)
155	{
156	case 32: return R_PCRLONG;
157	case 16: return R_PCRWORD;
158	case 8: return R_PCRBYTE;
159	}
160	}
161	else
162	{
163	switch (internal->bitsize)
164	{
165	case 32: return R_RELLONG;
166	case 16: return R_RELWORD;
167	case 8: return R_RELBYTE;
168	}
169	}
170	return R_RELLONG;
171	}
172
173	#ifdef STATIC_RELOCS
174	static
175	#endif
176	reloc_howto_type *
177	m68k_reloc_type_lookup (abfd, code)
5f771d47	178	bfd *abfd ATTRIBUTE_UNUSED;
252b5132 RH	179	bfd_reloc_code_real_type code;
	180	{
	181	switch (code)
	182	{
	183	default: return NULL;
	184	case BFD_RELOC_8: return m68kcoff_howto_table + 0;
	185	case BFD_RELOC_16: return m68kcoff_howto_table + 1;
	186	case BFD_RELOC_CTOR:
	187	case BFD_RELOC_32: return m68kcoff_howto_table + 2;
	188	case BFD_RELOC_8_PCREL: return m68kcoff_howto_table + 3;
	189	case BFD_RELOC_16_PCREL: return m68kcoff_howto_table + 4;
	190	case BFD_RELOC_32_PCREL: return m68kcoff_howto_table + 5;
	191	/* FIXME: There doesn't seem to be a code for R_RELLONG_NEG. */
	192	}
	193	/NOTREACHED/
	194	}
	195
	196	#endif /* not ONLY_DECLARE_RELOCS */
	197
	198	#define RTYPE2HOWTO(internal, relocentry) \
	199	m68k_rtype2howto(internal, (relocentry)->r_type)
	200
	201	#define SELECT_RELOC(external, internal) \
	202	external.r_type = m68k_howto2rtype (internal)
	203
	204	#define coff_bfd_reloc_type_lookup m68k_reloc_type_lookup
	205
	206	#ifndef COFF_COMMON_ADDEND
	207	#ifndef coff_rtype_to_howto
	208
	209	#define coff_rtype_to_howto m68kcoff_rtype_to_howto
	210
	211	static reloc_howto_type *m68kcoff_rtype_to_howto
	212	PARAMS ((bfd , asection , struct internal_reloc *,
	213	struct coff_link_hash_entry , struct internal_syment ,
	214	bfd_vma *));
	215
	216	/ARGSUSED/
	217	static reloc_howto_type *
	218	m68kcoff_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
5f771d47	219	bfd *abfd ATTRIBUTE_UNUSED;
252b5132 RH	220	asection *sec;
252b5132 RH	221	struct internal_reloc *rel;
5f771d47 ILT	222	struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
5f771d47 ILT	223	struct internal_syment *sym ATTRIBUTE_UNUSED;
252b5132 RH	224	bfd_vma *addendp;
	225	{
	226	arelent relent;
	227	reloc_howto_type *howto;
	228
	229	RTYPE2HOWTO (&relent, rel);
	230
	231	howto = relent.howto;
	232
	233	if (howto->pc_relative)
	234	*addendp += sec->vma;
	235
	236	return howto;
	237	}
	238
	239	#endif /* ! defined (coff_rtype_to_howto) */
	240	#endif /* ! defined (COFF_COMMON_ADDEND) */
	241	\f
	242	#ifdef COFF_COMMON_ADDEND
	243
	244	/* If COFF_COMMON_ADDEND is defined, then when using m68k COFF the
	245	value stored in the .text section for a reference to a common
	246	symbol is the value itself plus any desired offset. (taken from
	247	work done by Ian Taylor, Cygnus Support, for I386 COFF). */
	248
	249	/* If we are producing relocateable output, we need to do some
	250	adjustments to the object file that are not done by the
	251	bfd_perform_relocation function. This function is called by every
	252	reloc type to make any required adjustments. */
	253
	254	static bfd_reloc_status_type
	255	m68kcoff_common_addend_special_fn (abfd, reloc_entry, symbol, data,
	256	input_section, output_bfd, error_message)
	257	bfd *abfd;
	258	arelent *reloc_entry;
	259	asymbol *symbol;
	260	PTR data;
5f771d47	261	asection *input_section ATTRIBUTE_UNUSED;
252b5132	262	bfd *output_bfd;
5f771d47	263	char **error_message ATTRIBUTE_UNUSED;
252b5132 RH	264	{
	265	symvalue diff;
	266
	267	if (output_bfd == (bfd *) NULL)
	268	return bfd_reloc_continue;
	269
	270	if (bfd_is_com_section (symbol->section))
	271	{
	272	/* We are relocating a common symbol. The current value in the
	273	object file is ORIG + OFFSET, where ORIG is the value of the
	274	common symbol as seen by the object file when it was compiled
	275	(this may be zero if the symbol was undefined) and OFFSET is
	276	the offset into the common symbol (normally zero, but may be
	277	non-zero when referring to a field in a common structure).
	278	ORIG is the negative of reloc_entry->addend, which is set by
	279	the CALC_ADDEND macro below. We want to replace the value in
	280	the object file with NEW + OFFSET, where NEW is the value of
	281	the common symbol which we are going to put in the final
	282	object file. NEW is symbol->value. */
	283	diff = symbol->value + reloc_entry->addend;
	284	}
	285	else
	286	{
	287	/* For some reason bfd_perform_relocation always effectively
	288	ignores the addend for a COFF target when producing
	289	relocateable output. This seems to be always wrong for 386
	290	COFF, so we handle the addend here instead. */
	291	diff = reloc_entry->addend;
	292	}
	293
	294	#define DOIT(x) \
	295	x = ((x & ~howto->dst_mask) \| (((x & howto->src_mask) + diff) & howto->dst_mask))
	296
	297	if (diff != 0)
	298	{
	299	reloc_howto_type *howto = reloc_entry->howto;
	300	unsigned char addr = (unsigned char ) data + reloc_entry->address;
	301
	302	switch (howto->size)
	303	{
	304	case 0:
	305	{
	306	char x = bfd_get_8 (abfd, addr);
	307	DOIT (x);
	308	bfd_put_8 (abfd, x, addr);
	309	}
	310	break;
	311
	312	case 1:
	313	{
	314	short x = bfd_get_16 (abfd, addr);
	315	DOIT (x);
	316	bfd_put_16 (abfd, x, addr);
	317	}
	318	break;
	319
	320	case 2:
	321	{
	322	long x = bfd_get_32 (abfd, addr);
	323	DOIT (x);
	324	bfd_put_32 (abfd, x, addr);
	325	}
	326	break;
	327
328	default:
329	abort ();
330	}
331	}
332
333	/* Now let bfd_perform_relocation finish everything up. */
334	return bfd_reloc_continue;
335	}
336
337	/* Compute the addend of a reloc. If the reloc is to a common symbol,
338	the object file contains the value of the common symbol. By the
339	time this is called, the linker may be using a different symbol
340	from a different object file with a different value. Therefore, we
341	hack wildly to locate the original symbol from this file so that we
342	can make the correct adjustment. This macro sets coffsym to the
343	symbol from the original file, and uses it to set the addend value
344	correctly. If this is not a common symbol, the usual addend
345	calculation is done, except that an additional tweak is needed for
346	PC relative relocs.
347	FIXME: This macro refers to symbols and asect; these are from the
348	calling function, not the macro arguments. */
349
350	#define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
351	{ \
352	coff_symbol_type coffsym = (coff_symbol_type ) NULL; \
353	if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
354	coffsym = (obj_symbols (abfd) \
355	+ (cache_ptr->sym_ptr_ptr - symbols)); \
356	else if (ptr) \
357	coffsym = coff_symbol_from (abfd, ptr); \
358	if (coffsym != (coff_symbol_type *) NULL \
359	&& coffsym->native->u.syment.n_scnum == 0) \
360	cache_ptr->addend = - coffsym->native->u.syment.n_value; \
361	else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
362	&& ptr->section != (asection *) NULL) \
363	cache_ptr->addend = - (ptr->section->vma + ptr->value); \
364	else \
365	cache_ptr->addend = 0; \
366	if (ptr && (reloc.r_type == R_PCRBYTE \
367	\|\| reloc.r_type == R_PCRWORD \
368	\|\| reloc.r_type == R_PCRLONG)) \
369	cache_ptr->addend += asect->vma; \
370	}
371
372	#ifndef coff_rtype_to_howto
373
374	/* coff-m68k.c uses the special COFF backend linker. We need to
375	adjust common symbols. */
376
377	/ARGSUSED/
378	static reloc_howto_type *
379	m68kcoff_common_addend_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
5f771d47	380	bfd *abfd ATTRIBUTE_UNUSED;
252b5132 RH	381	asection *sec;
	382	struct internal_reloc *rel;
	383	struct coff_link_hash_entry *h;
	384	struct internal_syment *sym;
	385	bfd_vma *addendp;
	386	{
	387	arelent relent;
	388	reloc_howto_type *howto;
	389
	390	RTYPE2HOWTO (&relent, rel);
	391
	392	howto = relent.howto;
	393
	394	if (howto->pc_relative)
	395	*addendp += sec->vma;
	396
	397	if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
	398	{
	399	/* This is a common symbol. The section contents include the
	400	size (sym->n_value) as an addend. The relocate_section
	401	function will be adding in the final value of the symbol. We
	402	need to subtract out the current size in order to get the
	403	correct result. */
	404	BFD_ASSERT (h != NULL);
	405	*addendp -= sym->n_value;
	406	}
	407
	408	/* If the output symbol is common (in which case this must be a
	409	relocateable link), we need to add in the final size of the
	410	common symbol. */
	411	if (h != NULL && h->root.type == bfd_link_hash_common)
	412	*addendp += h->root.u.c.size;
	413
	414	return howto;
	415	}
	416
	417	#define coff_rtype_to_howto m68kcoff_common_addend_rtype_to_howto
	418
	419	#endif /* ! defined (coff_rtype_to_howto) */
	420
	421	#endif /* COFF_COMMON_ADDEND */
	422	\f
	423	#define coff_bfd_is_local_label_name m68k_coff_is_local_label_name
	424
	425	#define coff_relocate_section _bfd_coff_generic_relocate_section
	426
	427	#include "coffcode.h"
	428
	429	#ifndef TARGET_SYM
	430	#define TARGET_SYM m68kcoff_vec
	431	#endif
	432
	433	#ifndef TARGET_NAME
	434	#define TARGET_NAME "coff-m68k"
	435	#endif
	436
252b5132	437	#ifdef NAMES_HAVE_UNDERSCORE
c3c89269	438	CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, '_', NULL)
252b5132	439	#else
c3c89269	440	CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, 0, NULL)
252b5132	441	#endif