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

/* BFD back-end for Motorola 68000 COFF binaries.
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999,
   2000, 2001, 2002, 2003, 2005
   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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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 bfd_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 bfd_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
#define STAT_REL static
#else
#define STAT_REL
#endif

STAT_REL reloc_howto_type * m68k_reloc_type_lookup PARAMS ((bfd *, bfd_reloc_code_real_type));
STAT_REL int m68k_howto2rtype PARAMS ((reloc_howto_type *));
STAT_REL void m68k_rtype2howto PARAMS ((arelent *, int));


STAT_REL 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;
    }
}

STAT_REL 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;
}

STAT_REL 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 *));

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 relocatable 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
	 relocatable 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, (bfd_vma) x, addr);
	  }
	  break;

	case 2:
	  {
	    long x = bfd_get_32 (abfd, addr);
	    DOIT (x);
	    bfd_put_32 (abfd, (bfd_vma) 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.  */

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
     relocatable 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 */

#if !defined ONLY_DECLARE_RELOCS && ! defined STATIC_RELOCS
/* Given a .data section and a .emreloc in-memory section, store
   relocation information into the .emreloc section which can be
   used at runtime to relocate the section.  This is called by the
   linker when the --embedded-relocs switch is used.  This is called
   after the add_symbols entry point has been called for all the
   objects, and before the final_link entry point is called.  */

bfd_boolean
bfd_m68k_coff_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
     bfd *abfd;
     struct bfd_link_info *info;
     asection *datasec;
     asection *relsec;
     char **errmsg;
{
  char *extsyms;
  bfd_size_type symesz;
  struct internal_reloc *irel, *irelend;
  bfd_byte *p;
  bfd_size_type amt;

  BFD_ASSERT (! info->relocatable);

  *errmsg = NULL;

  if (datasec->reloc_count == 0)
    return TRUE;

  extsyms = obj_coff_external_syms (abfd);
  symesz = bfd_coff_symesz (abfd);

  irel = _bfd_coff_read_internal_relocs (abfd, datasec, TRUE, NULL, FALSE,
					 NULL);
  irelend = irel + datasec->reloc_count;

  amt = (bfd_size_type) datasec->reloc_count * 12;
  relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
  if (relsec->contents == NULL)
    return FALSE;

  p = relsec->contents;

  for (; irel < irelend; irel++, p += 12)
    {
      asection *targetsec;

      /* We are going to write a four byte longword into the runtime
       reloc section.  The longword will be the address in the data
       section which must be relocated.  It is followed by the name
       of the target section NUL-padded or truncated to 8
       characters.  */

      /* We can only relocate absolute longword relocs at run time.  */
      if (irel->r_type != R_RELLONG)
	{
	  *errmsg = _("unsupported reloc type");
	  bfd_set_error (bfd_error_bad_value);
	  return FALSE;
	}

      if (irel->r_symndx == -1)
	targetsec = bfd_abs_section_ptr;
      else
	{
	  struct coff_link_hash_entry *h;

	  h = obj_coff_sym_hashes (abfd)[irel->r_symndx];
	  if (h == NULL)
	    {
	      struct internal_syment isym;

	      bfd_coff_swap_sym_in (abfd, extsyms + symesz * irel->r_symndx,
				    &isym);
	      targetsec = coff_section_from_bfd_index (abfd, isym.n_scnum);
	    }
	  else if (h->root.type == bfd_link_hash_defined
		   || h->root.type == bfd_link_hash_defweak)
	    targetsec = h->root.u.def.section;
	  else
	    targetsec = NULL;
	}

      bfd_put_32 (abfd,
		  (irel->r_vaddr - datasec->vma + datasec->output_offset), p);
      memset (p + 4, 0, 8);
      if (targetsec != NULL)
	strncpy ((char *) p + 4, targetsec->output_section->name, 8);
    }

  return TRUE;
}
#endif /* neither ONLY_DECLARE_RELOCS not STATIC_RELOCS  */
\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, COFF_SWAP_TABLE)
#else
CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, 0, NULL, COFF_SWAP_TABLE)
#endif
Commit	Line	Data
252b5132	1	/* BFD back-end for Motorola 68000 COFF binaries.
67a374a5	2	Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999,
f075ee0c	3	2000, 2001, 2002, 2003, 2005
5f771d47	4	Free Software Foundation, Inc.
252b5132 RH	5	Written by Cygnus Support.
	6
	7	This file is part of BFD, the Binary File Descriptor library.
	8
	9	This program is free software; you can redistribute it and/or modify
	10	it under the terms of the GNU General Public License as published by
	11	the Free Software Foundation; either version 2 of the License, or
	12	(at your option) any later version.
	13
	14	This program is distributed in the hope that it will be useful,
	15	but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	GNU General Public License for more details.
	18
	19	You should have received a copy of the GNU General Public License
	20	along with this program; if not, write to the Free Software
3e110533	21	Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
252b5132 RH	22
	23	#include "bfd.h"
	24	#include "sysdep.h"
	25	#include "libbfd.h"
	26	#include "coff/m68k.h"
	27	#include "coff/internal.h"
	28	#include "libcoff.h"
	29
	30	/* This source file is compiled multiple times for various m68k COFF
	31	variants. The following macros control its behaviour:
	32
	33	TARGET_SYM
	34	The C name of the BFD target vector. The default is m68kcoff_vec.
	35	TARGET_NAME
	36	The user visible target name. The default is "coff-m68k".
	37	NAMES_HAVE_UNDERSCORE
	38	Whether symbol names have an underscore.
	39	ONLY_DECLARE_RELOCS
	40	Only declare the relocation howto array. Don't actually compile
	41	it. The actual array will be picked up in another version of the
	42	file.
	43	STATIC_RELOCS
	44	Make the relocation howto array, and associated functions, static.
	45	COFF_COMMON_ADDEND
	46	If this is defined, then, for a relocation against a common
	47	symbol, the object file holds the value (the size) of the common
	48	symbol. If this is not defined, then, for a relocation against a
	49	common symbol, the object file holds zero. */
	50
	51	#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)
	52
	53	#ifndef COFF_PAGE_SIZE
	54	/* The page size is a guess based on ELF. */
	55	#define COFF_PAGE_SIZE 0x2000
	56	#endif
	57
	58	#ifndef COFF_COMMON_ADDEND
	59	#define RELOC_SPECIAL_FN 0
	60	#else
	61	static bfd_reloc_status_type m68kcoff_common_addend_special_fn
	62	PARAMS ((bfd , arelent , asymbol , PTR, asection , bfd , char *));
	63	static reloc_howto_type *m68kcoff_common_addend_rtype_to_howto
	64	PARAMS ((bfd , asection , struct internal_reloc *,
	65	struct coff_link_hash_entry , struct internal_syment ,
	66	bfd_vma *));
	67	#define RELOC_SPECIAL_FN m68kcoff_common_addend_special_fn
	68	#endif
	69
b34976b6 AM	70	static bfd_boolean m68k_coff_is_local_label_name
b34976b6 AM	71	PARAMS ((bfd , const char ));
252b5132 RH	72
	73	/* On the delta, a symbol starting with L% is local. We won't see
	74	such a symbol on other platforms, so it should be safe to always
	75	consider it local here. */
	76
b34976b6	77	static bfd_boolean
252b5132 RH	78	m68k_coff_is_local_label_name (abfd, name)
	79	bfd *abfd;
	80	const char *name;
	81	{
	82	if (name[0] == 'L' && name[1] == '%')
b34976b6	83	return TRUE;
252b5132 RH	84
	85	return _bfd_coff_is_local_label_name (abfd, name);
	86	}
	87
	88	#ifndef STATIC_RELOCS
	89	/* Clean up namespace. */
	90	#define m68kcoff_howto_table _bfd_m68kcoff_howto_table
	91	#define m68k_rtype2howto _bfd_m68kcoff_rtype2howto
	92	#define m68k_howto2rtype _bfd_m68kcoff_howto2rtype
	93	#define m68k_reloc_type_lookup _bfd_m68kcoff_reloc_type_lookup
	94	#endif
	95
	96	#ifdef ONLY_DECLARE_RELOCS
	97	extern reloc_howto_type m68kcoff_howto_table[];
	98	#else
	99	#ifdef STATIC_RELOCS
	100	static
	101	#endif
b48499ec	102	reloc_howto_type m68kcoff_howto_table[] =
67a374a5	103	{
b34976b6 AM	104	HOWTO (R_RELBYTE, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "8", TRUE, 0x000000ff,0x000000ff, FALSE),
	105	HOWTO (R_RELWORD, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "16", TRUE, 0x0000ffff,0x0000ffff, FALSE),
	106	HOWTO (R_RELLONG, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "32", TRUE, 0xffffffff,0xffffffff, FALSE),
	107	HOWTO (R_PCRBYTE, 0, 0, 8, TRUE, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP8", TRUE, 0x000000ff,0x000000ff, FALSE),
	108	HOWTO (R_PCRWORD, 0, 1, 16, TRUE, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP16", TRUE, 0x0000ffff,0x0000ffff, FALSE),
	109	HOWTO (R_PCRLONG, 0, 2, 32, TRUE, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP32", TRUE, 0xffffffff,0xffffffff, FALSE),
	110	HOWTO (R_RELLONG_NEG, 0, -2, 32, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "-32", TRUE, 0xffffffff,0xffffffff, FALSE),
67a374a5	111	};
252b5132 RH	112	#endif /* not ONLY_DECLARE_RELOCS */
	113
	114	#ifndef BADMAG
	115	#define BADMAG(x) M68KBADMAG(x)
	116	#endif
	117	#define M68 1 /* Customize coffcode.h */
	118
	119	/* Turn a howto into a reloc number */
	120
	121	#ifdef ONLY_DECLARE_RELOCS
	122	extern void m68k_rtype2howto PARAMS ((arelent *internal, int relocentry));
	123	extern int m68k_howto2rtype PARAMS ((reloc_howto_type *));
	124	extern reloc_howto_type *m68k_reloc_type_lookup
	125	PARAMS ((bfd *, bfd_reloc_code_real_type));
	126	#else
f4ffd778	127
252b5132	128	#ifdef STATIC_RELOCS
f4ffd778 NC	129	#define STAT_REL static
	130	#else
	131	#define STAT_REL
252b5132	132	#endif
f4ffd778 NC	133
	134	STAT_REL reloc_howto_type * m68k_reloc_type_lookup PARAMS ((bfd *, bfd_reloc_code_real_type));
	135	STAT_REL int m68k_howto2rtype PARAMS ((reloc_howto_type *));
	136	STAT_REL void m68k_rtype2howto PARAMS ((arelent *, int));
	137
	138
	139	STAT_REL void
252b5132 RH	140	m68k_rtype2howto(internal, relocentry)
	141	arelent *internal;
	142	int relocentry;
	143	{
b48499ec	144	switch (relocentry)
67a374a5 NC	145	{
	146	case R_RELBYTE: internal->howto = m68kcoff_howto_table + 0; break;
	147	case R_RELWORD: internal->howto = m68kcoff_howto_table + 1; break;
	148	case R_RELLONG: internal->howto = m68kcoff_howto_table + 2; break;
	149	case R_PCRBYTE: internal->howto = m68kcoff_howto_table + 3; break;
	150	case R_PCRWORD: internal->howto = m68kcoff_howto_table + 4; break;
	151	case R_PCRLONG: internal->howto = m68kcoff_howto_table + 5; break;
	152	case R_RELLONG_NEG: internal->howto = m68kcoff_howto_table + 6; break;
	153	}
252b5132 RH	154	}
252b5132 RH	155
f4ffd778	156	STAT_REL int
252b5132 RH	157	m68k_howto2rtype (internal)
	158	reloc_howto_type *internal;
	159	{
b48499ec	160	if (internal->pc_relative)
252b5132	161	{
67a374a5 NC	162	switch (internal->bitsize)
	163	{
	164	case 32: return R_PCRLONG;
	165	case 16: return R_PCRWORD;
	166	case 8: return R_PCRBYTE;
	167	}
252b5132	168	}
b48499ec	169	else
67a374a5 NC	170	{
	171	switch (internal->bitsize)
	172	{
	173	case 32: return R_RELLONG;
	174	case 16: return R_RELWORD;
	175	case 8: return R_RELBYTE;
	176	}
	177	}
b48499ec	178	return R_RELLONG;
252b5132 RH	179	}
252b5132 RH	180
f4ffd778	181	STAT_REL reloc_howto_type *
252b5132	182	m68k_reloc_type_lookup (abfd, code)
5f771d47	183	bfd *abfd ATTRIBUTE_UNUSED;
252b5132 RH	184	bfd_reloc_code_real_type code;
	185	{
	186	switch (code)
	187	{
	188	default: return NULL;
	189	case BFD_RELOC_8: return m68kcoff_howto_table + 0;
	190	case BFD_RELOC_16: return m68kcoff_howto_table + 1;
	191	case BFD_RELOC_CTOR:
	192	case BFD_RELOC_32: return m68kcoff_howto_table + 2;
	193	case BFD_RELOC_8_PCREL: return m68kcoff_howto_table + 3;
	194	case BFD_RELOC_16_PCREL: return m68kcoff_howto_table + 4;
	195	case BFD_RELOC_32_PCREL: return m68kcoff_howto_table + 5;
	196	/* FIXME: There doesn't seem to be a code for R_RELLONG_NEG. */
	197	}
	198	/NOTREACHED/
	199	}
	200
	201	#endif /* not ONLY_DECLARE_RELOCS */
	202
	203	#define RTYPE2HOWTO(internal, relocentry) \
	204	m68k_rtype2howto(internal, (relocentry)->r_type)
	205
	206	#define SELECT_RELOC(external, internal) \
	207	external.r_type = m68k_howto2rtype (internal)
	208
	209	#define coff_bfd_reloc_type_lookup m68k_reloc_type_lookup
	210
	211	#ifndef COFF_COMMON_ADDEND
	212	#ifndef coff_rtype_to_howto
	213
	214	#define coff_rtype_to_howto m68kcoff_rtype_to_howto
	215
	216	static reloc_howto_type *m68kcoff_rtype_to_howto
	217	PARAMS ((bfd , asection , struct internal_reloc *,
	218	struct coff_link_hash_entry , struct internal_syment ,
	219	bfd_vma *));
	220
252b5132 RH	221	static reloc_howto_type *
252b5132 RH	222	m68kcoff_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
5f771d47	223	bfd *abfd ATTRIBUTE_UNUSED;
252b5132 RH	224	asection *sec;
252b5132 RH	225	struct internal_reloc *rel;
5f771d47 ILT	226	struct coff_link_hash_entry *h ATTRIBUTE_UNUSED;
5f771d47 ILT	227	struct internal_syment *sym ATTRIBUTE_UNUSED;
252b5132 RH	228	bfd_vma *addendp;
	229	{
	230	arelent relent;
	231	reloc_howto_type *howto;
	232
	233	RTYPE2HOWTO (&relent, rel);
	234
	235	howto = relent.howto;
	236
	237	if (howto->pc_relative)
	238	*addendp += sec->vma;
	239
	240	return howto;
	241	}
	242
	243	#endif /* ! defined (coff_rtype_to_howto) */
	244	#endif /* ! defined (COFF_COMMON_ADDEND) */
	245	\f
	246	#ifdef COFF_COMMON_ADDEND
	247
	248	/* If COFF_COMMON_ADDEND is defined, then when using m68k COFF the
	249	value stored in the .text section for a reference to a common
	250	symbol is the value itself plus any desired offset. (taken from
	251	work done by Ian Taylor, Cygnus Support, for I386 COFF). */
	252
1049f94e	253	/* If we are producing relocatable output, we need to do some
252b5132 RH	254	adjustments to the object file that are not done by the
	255	bfd_perform_relocation function. This function is called by every
	256	reloc type to make any required adjustments. */
	257
	258	static bfd_reloc_status_type
	259	m68kcoff_common_addend_special_fn (abfd, reloc_entry, symbol, data,
	260	input_section, output_bfd, error_message)
	261	bfd *abfd;
	262	arelent *reloc_entry;
	263	asymbol *symbol;
	264	PTR data;
5f771d47	265	asection *input_section ATTRIBUTE_UNUSED;
252b5132	266	bfd *output_bfd;
5f771d47	267	char **error_message ATTRIBUTE_UNUSED;
252b5132 RH	268	{
	269	symvalue diff;
	270
	271	if (output_bfd == (bfd *) NULL)
	272	return bfd_reloc_continue;
	273
	274	if (bfd_is_com_section (symbol->section))
	275	{
	276	/* We are relocating a common symbol. The current value in the
	277	object file is ORIG + OFFSET, where ORIG is the value of the
	278	common symbol as seen by the object file when it was compiled
	279	(this may be zero if the symbol was undefined) and OFFSET is
	280	the offset into the common symbol (normally zero, but may be
	281	non-zero when referring to a field in a common structure).
	282	ORIG is the negative of reloc_entry->addend, which is set by
	283	the CALC_ADDEND macro below. We want to replace the value in
	284	the object file with NEW + OFFSET, where NEW is the value of
	285	the common symbol which we are going to put in the final
	286	object file. NEW is symbol->value. */
	287	diff = symbol->value + reloc_entry->addend;
	288	}
	289	else
	290	{
	291	/* For some reason bfd_perform_relocation always effectively
	292	ignores the addend for a COFF target when producing
1049f94e	293	relocatable output. This seems to be always wrong for 386
252b5132 RH	294	COFF, so we handle the addend here instead. */
	295	diff = reloc_entry->addend;
	296	}
	297
	298	#define DOIT(x) \
	299	x = ((x & ~howto->dst_mask) \| (((x & howto->src_mask) + diff) & howto->dst_mask))
	300
	301	if (diff != 0)
	302	{
	303	reloc_howto_type *howto = reloc_entry->howto;
	304	unsigned char addr = (unsigned char ) data + reloc_entry->address;
	305
	306	switch (howto->size)
	307	{
	308	case 0:
	309	{
	310	char x = bfd_get_8 (abfd, addr);
	311	DOIT (x);
	312	bfd_put_8 (abfd, x, addr);
	313	}
	314	break;
	315
	316	case 1:
	317	{
	318	short x = bfd_get_16 (abfd, addr);
	319	DOIT (x);
dc810e39	320	bfd_put_16 (abfd, (bfd_vma) x, addr);
252b5132 RH	321	}
	322	break;
	323
	324	case 2:
	325	{
	326	long x = bfd_get_32 (abfd, addr);
	327	DOIT (x);
dc810e39	328	bfd_put_32 (abfd, (bfd_vma) x, addr);
252b5132 RH	329	}
	330	break;
	331
	332	default:
	333	abort ();
	334	}
	335	}
	336
	337	/* Now let bfd_perform_relocation finish everything up. */
	338	return bfd_reloc_continue;
	339	}
	340
	341	/* Compute the addend of a reloc. If the reloc is to a common symbol,
	342	the object file contains the value of the common symbol. By the
	343	time this is called, the linker may be using a different symbol
	344	from a different object file with a different value. Therefore, we
	345	hack wildly to locate the original symbol from this file so that we
	346	can make the correct adjustment. This macro sets coffsym to the
	347	symbol from the original file, and uses it to set the addend value
	348	correctly. If this is not a common symbol, the usual addend
	349	calculation is done, except that an additional tweak is needed for
	350	PC relative relocs.
	351	FIXME: This macro refers to symbols and asect; these are from the
	352	calling function, not the macro arguments. */
	353
	354	#define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
	355	{ \
	356	coff_symbol_type coffsym = (coff_symbol_type ) NULL; \
	357	if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
	358	coffsym = (obj_symbols (abfd) \
	359	+ (cache_ptr->sym_ptr_ptr - symbols)); \
	360	else if (ptr) \
	361	coffsym = coff_symbol_from (abfd, ptr); \
	362	if (coffsym != (coff_symbol_type *) NULL \
	363	&& coffsym->native->u.syment.n_scnum == 0) \
	364	cache_ptr->addend = - coffsym->native->u.syment.n_value; \
	365	else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
	366	&& ptr->section != (asection *) NULL) \
	367	cache_ptr->addend = - (ptr->section->vma + ptr->value); \
	368	else \
	369	cache_ptr->addend = 0; \
	370	if (ptr && (reloc.r_type == R_PCRBYTE \
	371	\|\| reloc.r_type == R_PCRWORD \
	372	\|\| reloc.r_type == R_PCRLONG)) \
	373	cache_ptr->addend += asect->vma; \
	374	}
	375
	376	#ifndef coff_rtype_to_howto
	377
	378	/* coff-m68k.c uses the special COFF backend linker. We need to
	379	adjust common symbols. */
	380
252b5132 RH	381	static reloc_howto_type *
252b5132 RH	382	m68kcoff_common_addend_rtype_to_howto (abfd, sec, rel, h, sym, addendp)
5f771d47	383	bfd *abfd ATTRIBUTE_UNUSED;
252b5132 RH	384	asection *sec;
	385	struct internal_reloc *rel;
	386	struct coff_link_hash_entry *h;
	387	struct internal_syment *sym;
	388	bfd_vma *addendp;
	389	{
	390	arelent relent;
	391	reloc_howto_type *howto;
	392
	393	RTYPE2HOWTO (&relent, rel);
	394
	395	howto = relent.howto;
	396
	397	if (howto->pc_relative)
	398	*addendp += sec->vma;
	399
	400	if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
	401	{
	402	/* This is a common symbol. The section contents include the
	403	size (sym->n_value) as an addend. The relocate_section
	404	function will be adding in the final value of the symbol. We
	405	need to subtract out the current size in order to get the
	406	correct result. */
	407	BFD_ASSERT (h != NULL);
	408	*addendp -= sym->n_value;
	409	}
	410
	411	/* If the output symbol is common (in which case this must be a
1049f94e	412	relocatable link), we need to add in the final size of the
252b5132 RH	413	common symbol. */
	414	if (h != NULL && h->root.type == bfd_link_hash_common)
	415	*addendp += h->root.u.c.size;
	416
	417	return howto;
	418	}
	419
	420	#define coff_rtype_to_howto m68kcoff_common_addend_rtype_to_howto
	421
	422	#endif /* ! defined (coff_rtype_to_howto) */
	423
	424	#endif /* COFF_COMMON_ADDEND */
20bccb34 NC	425
	426	#if !defined ONLY_DECLARE_RELOCS && ! defined STATIC_RELOCS
	427	/* Given a .data section and a .emreloc in-memory section, store
	428	relocation information into the .emreloc section which can be
	429	used at runtime to relocate the section. This is called by the
	430	linker when the --embedded-relocs switch is used. This is called
	431	after the add_symbols entry point has been called for all the
	432	objects, and before the final_link entry point is called. */
	433
b34976b6	434	bfd_boolean
20bccb34 NC	435	bfd_m68k_coff_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
	436	bfd *abfd;
	437	struct bfd_link_info *info;
	438	asection *datasec;
	439	asection *relsec;
	440	char **errmsg;
	441	{
	442	char *extsyms;
	443	bfd_size_type symesz;
	444	struct internal_reloc irel, irelend;
	445	bfd_byte *p;
dc810e39	446	bfd_size_type amt;
20bccb34	447
1049f94e	448	BFD_ASSERT (! info->relocatable);
20bccb34 NC	449
	450	*errmsg = NULL;
	451
	452	if (datasec->reloc_count == 0)
b34976b6	453	return TRUE;
20bccb34 NC	454
	455	extsyms = obj_coff_external_syms (abfd);
	456	symesz = bfd_coff_symesz (abfd);
	457
b34976b6	458	irel = _bfd_coff_read_internal_relocs (abfd, datasec, TRUE, NULL, FALSE,
20bccb34 NC	459	NULL);
	460	irelend = irel + datasec->reloc_count;
	461
dc810e39 AM	462	amt = (bfd_size_type) datasec->reloc_count * 12;
dc810e39 AM	463	relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
20bccb34	464	if (relsec->contents == NULL)
b34976b6	465	return FALSE;
20bccb34 NC	466
	467	p = relsec->contents;
	468
	469	for (; irel < irelend; irel++, p += 12)
	470	{
	471	asection *targetsec;
	472
	473	/* We are going to write a four byte longword into the runtime
	474	reloc section. The longword will be the address in the data
	475	section which must be relocated. It is followed by the name
	476	of the target section NUL-padded or truncated to 8
	477	characters. */
	478
	479	/* We can only relocate absolute longword relocs at run time. */
	480	if (irel->r_type != R_RELLONG)
	481	{
	482	*errmsg = _("unsupported reloc type");
	483	bfd_set_error (bfd_error_bad_value);
b34976b6	484	return FALSE;
20bccb34 NC	485	}
	486
	487	if (irel->r_symndx == -1)
	488	targetsec = bfd_abs_section_ptr;
	489	else
	490	{
	491	struct coff_link_hash_entry *h;
b48499ec	492
20bccb34 NC	493	h = obj_coff_sym_hashes (abfd)[irel->r_symndx];
	494	if (h == NULL)
	495	{
	496	struct internal_syment isym;
b48499ec	497
20bccb34 NC	498	bfd_coff_swap_sym_in (abfd, extsyms + symesz * irel->r_symndx,
	499	&isym);
	500	targetsec = coff_section_from_bfd_index (abfd, isym.n_scnum);
	501	}
	502	else if (h->root.type == bfd_link_hash_defined
	503	\|\| h->root.type == bfd_link_hash_defweak)
	504	targetsec = h->root.u.def.section;
	505	else
	506	targetsec = NULL;
	507	}
b48499ec	508
20bccb34 NC	509	bfd_put_32 (abfd,
	510	(irel->r_vaddr - datasec->vma + datasec->output_offset), p);
	511	memset (p + 4, 0, 8);
ff0829fd	512	if (targetsec != NULL)
f075ee0c	513	strncpy ((char *) p + 4, targetsec->output_section->name, 8);
20bccb34	514	}
b48499ec	515
b34976b6	516	return TRUE;
20bccb34 NC	517	}
20bccb34 NC	518	#endif /* neither ONLY_DECLARE_RELOCS not STATIC_RELOCS */
252b5132 RH	519	\f
	520	#define coff_bfd_is_local_label_name m68k_coff_is_local_label_name
	521
	522	#define coff_relocate_section _bfd_coff_generic_relocate_section
	523
	524	#include "coffcode.h"
	525
	526	#ifndef TARGET_SYM
	527	#define TARGET_SYM m68kcoff_vec
	528	#endif
	529
	530	#ifndef TARGET_NAME
	531	#define TARGET_NAME "coff-m68k"
	532	#endif
	533
252b5132	534	#ifdef NAMES_HAVE_UNDERSCORE
3fa78519	535	CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, '_', NULL, COFF_SWAP_TABLE)
252b5132	536	#else
3fa78519	537	CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, 0, NULL, COFF_SWAP_TABLE)
252b5132	538	#endif