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

/* BFD back-end for Motorola 68000 COFF binaries.
   Copyright (C) 1990-2014 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 3 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 "sysdep.h"
#include "bfd.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
  (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);

#define RELOC_SPECIAL_FN m68kcoff_common_addend_special_fn
#endif

static bfd_boolean m68k_coff_is_local_label_name (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 (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
#define m68k_reloc_name_lookup _bfd_m68kcoff_reloc_name_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 (arelent *internal, int relocentry);
extern int m68k_howto2rtype (reloc_howto_type *);
extern reloc_howto_type * m68k_reloc_type_lookup
  (bfd *, bfd_reloc_code_real_type);
extern reloc_howto_type * m68k_reloc_name_lookup (bfd *, const char *);
#else

#ifdef STATIC_RELOCS
#define STAT_REL static
#else
#define STAT_REL
#endif

STAT_REL void m68k_rtype2howto (arelent *, int);
STAT_REL int  m68k_howto2rtype (reloc_howto_type *);
STAT_REL reloc_howto_type * m68k_reloc_type_lookup (bfd *, bfd_reloc_code_real_type);
STAT_REL reloc_howto_type * m68k_reloc_name_lookup (bfd *, const char *);

STAT_REL void
m68k_rtype2howto (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 (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 (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*/
}

STAT_REL reloc_howto_type *
m68k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
		        const char *r_name)
{
  unsigned int i;

  for (i = 0;
       i < sizeof (m68kcoff_howto_table) / sizeof (m68kcoff_howto_table[0]);
       i++)
    if (m68kcoff_howto_table[i].name != NULL
	&& strcasecmp (m68kcoff_howto_table[i].name, r_name) == 0)
      return &m68kcoff_howto_table[i];

  return NULL;
}

#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
#define coff_bfd_reloc_name_lookup m68k_reloc_name_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 (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;

  relent.howto = NULL;
  RTYPE2HOWTO (&relent, rel);

  howto = relent.howto;

  if (howto != NULL && 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 (bfd *abfd,
				   arelent *reloc_entry,
				   asymbol *symbol,
				   void * 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 (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;

  relent.howto = NULL;
  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 (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

#ifndef bfd_pe_print_pdata
#define bfd_pe_print_pdata	NULL
#endif

#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.
4b95cf5c	2	Copyright (C) 1990-2014 Free Software Foundation, Inc.
252b5132 RH	3	Written by Cygnus Support.
252b5132 RH	4
cd123cb7	5	This file is part of BFD, the Binary File Descriptor library.
252b5132	6
cd123cb7 NC	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 3 of the License, or
	10	(at your option) any later version.
252b5132	11
cd123cb7 NC	12	This program is distributed in the hope that it will be useful,
	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.
252b5132	16
cd123cb7 NC	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
	20	MA 02110-1301, USA. */
252b5132	21
252b5132	22	#include "sysdep.h"
3db64b00	23	#include "bfd.h"
252b5132 RH	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
2c3fc389 NC	61	(bfd , arelent , asymbol , void , asection , bfd , char **);
2c3fc389 NC	62
252b5132 RH	63	#define RELOC_SPECIAL_FN m68kcoff_common_addend_special_fn
	64	#endif
	65
2c3fc389	66	static bfd_boolean m68k_coff_is_local_label_name (bfd , const char );
252b5132 RH	67
	68	/* On the delta, a symbol starting with L% is local. We won't see
	69	such a symbol on other platforms, so it should be safe to always
	70	consider it local here. */
	71
b34976b6	72	static bfd_boolean
2c3fc389	73	m68k_coff_is_local_label_name (bfd abfd, const char name)
252b5132 RH	74	{
252b5132 RH	75	if (name[0] == 'L' && name[1] == '%')
b34976b6	76	return TRUE;
252b5132 RH	77
	78	return _bfd_coff_is_local_label_name (abfd, name);
	79	}
	80
	81	#ifndef STATIC_RELOCS
	82	/* Clean up namespace. */
	83	#define m68kcoff_howto_table _bfd_m68kcoff_howto_table
	84	#define m68k_rtype2howto _bfd_m68kcoff_rtype2howto
	85	#define m68k_howto2rtype _bfd_m68kcoff_howto2rtype
	86	#define m68k_reloc_type_lookup _bfd_m68kcoff_reloc_type_lookup
157090f7	87	#define m68k_reloc_name_lookup _bfd_m68kcoff_reloc_name_lookup
252b5132 RH	88	#endif
	89
	90	#ifdef ONLY_DECLARE_RELOCS
	91	extern reloc_howto_type m68kcoff_howto_table[];
	92	#else
	93	#ifdef STATIC_RELOCS
	94	static
	95	#endif
b48499ec	96	reloc_howto_type m68kcoff_howto_table[] =
67a374a5	97	{
b34976b6 AM	98	HOWTO (R_RELBYTE, 0, 0, 8, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "8", TRUE, 0x000000ff,0x000000ff, FALSE),
	99	HOWTO (R_RELWORD, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "16", TRUE, 0x0000ffff,0x0000ffff, FALSE),
	100	HOWTO (R_RELLONG, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "32", TRUE, 0xffffffff,0xffffffff, FALSE),
	101	HOWTO (R_PCRBYTE, 0, 0, 8, TRUE, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP8", TRUE, 0x000000ff,0x000000ff, FALSE),
	102	HOWTO (R_PCRWORD, 0, 1, 16, TRUE, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP16", TRUE, 0x0000ffff,0x0000ffff, FALSE),
	103	HOWTO (R_PCRLONG, 0, 2, 32, TRUE, 0, complain_overflow_signed, RELOC_SPECIAL_FN, "DISP32", TRUE, 0xffffffff,0xffffffff, FALSE),
	104	HOWTO (R_RELLONG_NEG, 0, -2, 32, FALSE, 0, complain_overflow_bitfield, RELOC_SPECIAL_FN, "-32", TRUE, 0xffffffff,0xffffffff, FALSE),
67a374a5	105	};
252b5132 RH	106	#endif /* not ONLY_DECLARE_RELOCS */
	107
	108	#ifndef BADMAG
	109	#define BADMAG(x) M68KBADMAG(x)
	110	#endif
	111	#define M68 1 /* Customize coffcode.h */
	112
	113	/* Turn a howto into a reloc number */
	114
	115	#ifdef ONLY_DECLARE_RELOCS
2c3fc389 NC	116	extern void m68k_rtype2howto (arelent *internal, int relocentry);
	117	extern int m68k_howto2rtype (reloc_howto_type *);
	118	extern reloc_howto_type * m68k_reloc_type_lookup
	119	(bfd *, bfd_reloc_code_real_type);
	120	extern reloc_howto_type * m68k_reloc_name_lookup (bfd , const char );
252b5132	121	#else
f4ffd778	122
252b5132	123	#ifdef STATIC_RELOCS
f4ffd778 NC	124	#define STAT_REL static
	125	#else
	126	#define STAT_REL
252b5132	127	#endif
f4ffd778	128
2c3fc389 NC	129	STAT_REL void m68k_rtype2howto (arelent *, int);
	130	STAT_REL int m68k_howto2rtype (reloc_howto_type *);
	131	STAT_REL reloc_howto_type * m68k_reloc_type_lookup (bfd *, bfd_reloc_code_real_type);
	132	STAT_REL reloc_howto_type * m68k_reloc_name_lookup (bfd , const char );
f4ffd778 NC	133
f4ffd778 NC	134	STAT_REL void
2c3fc389	135	m68k_rtype2howto (arelent *internal, int relocentry)
252b5132	136	{
b48499ec	137	switch (relocentry)
67a374a5 NC	138	{
	139	case R_RELBYTE: internal->howto = m68kcoff_howto_table + 0; break;
	140	case R_RELWORD: internal->howto = m68kcoff_howto_table + 1; break;
	141	case R_RELLONG: internal->howto = m68kcoff_howto_table + 2; break;
	142	case R_PCRBYTE: internal->howto = m68kcoff_howto_table + 3; break;
	143	case R_PCRWORD: internal->howto = m68kcoff_howto_table + 4; break;
	144	case R_PCRLONG: internal->howto = m68kcoff_howto_table + 5; break;
	145	case R_RELLONG_NEG: internal->howto = m68kcoff_howto_table + 6; break;
	146	}
252b5132 RH	147	}
252b5132 RH	148
f4ffd778	149	STAT_REL int
2c3fc389	150	m68k_howto2rtype (reloc_howto_type * internal)
252b5132	151	{
b48499ec	152	if (internal->pc_relative)
252b5132	153	{
67a374a5 NC	154	switch (internal->bitsize)
	155	{
	156	case 32: return R_PCRLONG;
	157	case 16: return R_PCRWORD;
	158	case 8: return R_PCRBYTE;
	159	}
252b5132	160	}
b48499ec	161	else
67a374a5 NC	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	}
b48499ec	170	return R_RELLONG;
252b5132 RH	171	}
252b5132 RH	172
f4ffd778	173	STAT_REL reloc_howto_type *
2c3fc389 NC	174	m68k_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
2c3fc389 NC	175	bfd_reloc_code_real_type code)
252b5132 RH	176	{
	177	switch (code)
	178	{
	179	default: return NULL;
	180	case BFD_RELOC_8: return m68kcoff_howto_table + 0;
	181	case BFD_RELOC_16: return m68kcoff_howto_table + 1;
	182	case BFD_RELOC_CTOR:
	183	case BFD_RELOC_32: return m68kcoff_howto_table + 2;
	184	case BFD_RELOC_8_PCREL: return m68kcoff_howto_table + 3;
	185	case BFD_RELOC_16_PCREL: return m68kcoff_howto_table + 4;
	186	case BFD_RELOC_32_PCREL: return m68kcoff_howto_table + 5;
	187	/* FIXME: There doesn't seem to be a code for R_RELLONG_NEG. */
	188	}
	189	/NOTREACHED/
	190	}
	191
157090f7 AM	192	STAT_REL reloc_howto_type *
	193	m68k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
	194	const char *r_name)
	195	{
	196	unsigned int i;
	197
	198	for (i = 0;
	199	i < sizeof (m68kcoff_howto_table) / sizeof (m68kcoff_howto_table[0]);
	200	i++)
	201	if (m68kcoff_howto_table[i].name != NULL
	202	&& strcasecmp (m68kcoff_howto_table[i].name, r_name) == 0)
	203	return &m68kcoff_howto_table[i];
	204
	205	return NULL;
	206	}
	207
252b5132 RH	208	#endif /* not ONLY_DECLARE_RELOCS */
	209
	210	#define RTYPE2HOWTO(internal, relocentry) \
	211	m68k_rtype2howto(internal, (relocentry)->r_type)
	212
	213	#define SELECT_RELOC(external, internal) \
	214	external.r_type = m68k_howto2rtype (internal)
	215
	216	#define coff_bfd_reloc_type_lookup m68k_reloc_type_lookup
157090f7	217	#define coff_bfd_reloc_name_lookup m68k_reloc_name_lookup
252b5132 RH	218
	219	#ifndef COFF_COMMON_ADDEND
	220	#ifndef coff_rtype_to_howto
	221
	222	#define coff_rtype_to_howto m68kcoff_rtype_to_howto
	223
252b5132	224	static reloc_howto_type *
2c3fc389 NC	225	m68kcoff_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
	226	asection *sec,
	227	struct internal_reloc *rel,
	228	struct coff_link_hash_entry *h ATTRIBUTE_UNUSED,
	229	struct internal_syment *sym ATTRIBUTE_UNUSED,
	230	bfd_vma *addendp)
252b5132 RH	231	{
	232	arelent relent;
	233	reloc_howto_type *howto;
	234
40b1c6c5	235	relent.howto = NULL;
252b5132 RH	236	RTYPE2HOWTO (&relent, rel);
	237
	238	howto = relent.howto;
	239
40b1c6c5	240	if (howto != NULL && howto->pc_relative)
252b5132 RH	241	*addendp += sec->vma;
	242
	243	return howto;
	244	}
	245
	246	#endif /* ! defined (coff_rtype_to_howto) */
	247	#endif /* ! defined (COFF_COMMON_ADDEND) */
	248	\f
	249	#ifdef COFF_COMMON_ADDEND
	250
	251	/* If COFF_COMMON_ADDEND is defined, then when using m68k COFF the
	252	value stored in the .text section for a reference to a common
	253	symbol is the value itself plus any desired offset. (taken from
	254	work done by Ian Taylor, Cygnus Support, for I386 COFF). */
	255
1049f94e	256	/* If we are producing relocatable output, we need to do some
252b5132 RH	257	adjustments to the object file that are not done by the
	258	bfd_perform_relocation function. This function is called by every
	259	reloc type to make any required adjustments. */
	260
	261	static bfd_reloc_status_type
2c3fc389 NC	262	m68kcoff_common_addend_special_fn (bfd *abfd,
	263	arelent *reloc_entry,
	264	asymbol *symbol,
	265	void * data,
	266	asection *input_section ATTRIBUTE_UNUSED,
	267	bfd *output_bfd,
	268	char **error_message ATTRIBUTE_UNUSED)
252b5132 RH	269	{
	270	symvalue diff;
	271
	272	if (output_bfd == (bfd *) NULL)
	273	return bfd_reloc_continue;
	274
	275	if (bfd_is_com_section (symbol->section))
	276	{
	277	/* We are relocating a common symbol. The current value in the
	278	object file is ORIG + OFFSET, where ORIG is the value of the
	279	common symbol as seen by the object file when it was compiled
	280	(this may be zero if the symbol was undefined) and OFFSET is
	281	the offset into the common symbol (normally zero, but may be
	282	non-zero when referring to a field in a common structure).
	283	ORIG is the negative of reloc_entry->addend, which is set by
	284	the CALC_ADDEND macro below. We want to replace the value in
	285	the object file with NEW + OFFSET, where NEW is the value of
	286	the common symbol which we are going to put in the final
	287	object file. NEW is symbol->value. */
	288	diff = symbol->value + reloc_entry->addend;
	289	}
	290	else
	291	{
	292	/* For some reason bfd_perform_relocation always effectively
	293	ignores the addend for a COFF target when producing
1049f94e	294	relocatable output. This seems to be always wrong for 386
252b5132 RH	295	COFF, so we handle the addend here instead. */
	296	diff = reloc_entry->addend;
	297	}
	298
	299	#define DOIT(x) \
	300	x = ((x & ~howto->dst_mask) \| (((x & howto->src_mask) + diff) & howto->dst_mask))
	301
	302	if (diff != 0)
	303	{
	304	reloc_howto_type *howto = reloc_entry->howto;
	305	unsigned char addr = (unsigned char ) data + reloc_entry->address;
	306
	307	switch (howto->size)
	308	{
	309	case 0:
	310	{
	311	char x = bfd_get_8 (abfd, addr);
	312	DOIT (x);
	313	bfd_put_8 (abfd, x, addr);
	314	}
	315	break;
	316
	317	case 1:
	318	{
	319	short x = bfd_get_16 (abfd, addr);
	320	DOIT (x);
dc810e39	321	bfd_put_16 (abfd, (bfd_vma) x, addr);
252b5132 RH	322	}
	323	break;
	324
	325	case 2:
	326	{
	327	long x = bfd_get_32 (abfd, addr);
	328	DOIT (x);
dc810e39	329	bfd_put_32 (abfd, (bfd_vma) x, addr);
252b5132 RH	330	}
	331	break;
	332
	333	default:
	334	abort ();
	335	}
	336	}
	337
	338	/* Now let bfd_perform_relocation finish everything up. */
	339	return bfd_reloc_continue;
	340	}
	341
	342	/* Compute the addend of a reloc. If the reloc is to a common symbol,
	343	the object file contains the value of the common symbol. By the
	344	time this is called, the linker may be using a different symbol
	345	from a different object file with a different value. Therefore, we
	346	hack wildly to locate the original symbol from this file so that we
	347	can make the correct adjustment. This macro sets coffsym to the
	348	symbol from the original file, and uses it to set the addend value
	349	correctly. If this is not a common symbol, the usual addend
	350	calculation is done, except that an additional tweak is needed for
	351	PC relative relocs.
	352	FIXME: This macro refers to symbols and asect; these are from the
	353	calling function, not the macro arguments. */
	354
	355	#define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
	356	{ \
	357	coff_symbol_type coffsym = (coff_symbol_type ) NULL; \
	358	if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
	359	coffsym = (obj_symbols (abfd) \
	360	+ (cache_ptr->sym_ptr_ptr - symbols)); \
	361	else if (ptr) \
	362	coffsym = coff_symbol_from (abfd, ptr); \
	363	if (coffsym != (coff_symbol_type *) NULL \
	364	&& coffsym->native->u.syment.n_scnum == 0) \
	365	cache_ptr->addend = - coffsym->native->u.syment.n_value; \
	366	else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
	367	&& ptr->section != (asection *) NULL) \
	368	cache_ptr->addend = - (ptr->section->vma + ptr->value); \
	369	else \
	370	cache_ptr->addend = 0; \
	371	if (ptr && (reloc.r_type == R_PCRBYTE \
	372	\|\| reloc.r_type == R_PCRWORD \
	373	\|\| reloc.r_type == R_PCRLONG)) \
	374	cache_ptr->addend += asect->vma; \
	375	}
	376
	377	#ifndef coff_rtype_to_howto
	378
	379	/* coff-m68k.c uses the special COFF backend linker. We need to
	380	adjust common symbols. */
	381
252b5132	382	static reloc_howto_type *
2c3fc389 NC	383	m68kcoff_common_addend_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
	384	asection *sec,
	385	struct internal_reloc *rel,
	386	struct coff_link_hash_entry *h,
	387	struct internal_syment *sym,
	388	bfd_vma *addendp)
252b5132 RH	389	{
	390	arelent relent;
	391	reloc_howto_type *howto;
	392
1b0b5b1b	393	relent.howto = NULL;
252b5132 RH	394	RTYPE2HOWTO (&relent, rel);
	395
	396	howto = relent.howto;
	397
	398	if (howto->pc_relative)
	399	*addendp += sec->vma;
	400
	401	if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
	402	{
	403	/* This is a common symbol. The section contents include the
	404	size (sym->n_value) as an addend. The relocate_section
	405	function will be adding in the final value of the symbol. We
	406	need to subtract out the current size in order to get the
	407	correct result. */
	408	BFD_ASSERT (h != NULL);
	409	*addendp -= sym->n_value;
	410	}
	411
	412	/* If the output symbol is common (in which case this must be a
1049f94e	413	relocatable link), we need to add in the final size of the
252b5132 RH	414	common symbol. */
	415	if (h != NULL && h->root.type == bfd_link_hash_common)
	416	*addendp += h->root.u.c.size;
	417
	418	return howto;
	419	}
	420
	421	#define coff_rtype_to_howto m68kcoff_common_addend_rtype_to_howto
	422
	423	#endif /* ! defined (coff_rtype_to_howto) */
	424
	425	#endif /* COFF_COMMON_ADDEND */
20bccb34 NC	426
	427	#if !defined ONLY_DECLARE_RELOCS && ! defined STATIC_RELOCS
	428	/* Given a .data section and a .emreloc in-memory section, store
	429	relocation information into the .emreloc section which can be
	430	used at runtime to relocate the section. This is called by the
	431	linker when the --embedded-relocs switch is used. This is called
	432	after the add_symbols entry point has been called for all the
	433	objects, and before the final_link entry point is called. */
	434
b34976b6	435	bfd_boolean
2c3fc389 NC	436	bfd_m68k_coff_create_embedded_relocs (bfd *abfd,
	437	struct bfd_link_info *info,
	438	asection *datasec,
	439	asection *relsec,
	440	char **errmsg)
20bccb34 NC	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
2b5c217d NC	524	#ifndef bfd_pe_print_pdata
	525	#define bfd_pe_print_pdata NULL
	526	#endif
	527
252b5132 RH	528	#include "coffcode.h"
	529
	530	#ifndef TARGET_SYM
	531	#define TARGET_SYM m68kcoff_vec
	532	#endif
	533
	534	#ifndef TARGET_NAME
	535	#define TARGET_NAME "coff-m68k"
	536	#endif
	537
252b5132	538	#ifdef NAMES_HAVE_UNDERSCORE
3fa78519	539	CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, '_', NULL, COFF_SWAP_TABLE)
252b5132	540	#else
3fa78519	541	CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, 0, NULL, COFF_SWAP_TABLE)
252b5132	542	#endif