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

/* BFD back-end for Motorola 68000 COFF binaries.
   Copyright (C) 1990-2016 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 m68k_coff_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;
    default:            internal->howto = NULL; 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 (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 (! bfd_link_relocatable (info));

  *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 m68k_coff_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.
6f2750fe	2	Copyright (C) 1990-2016 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
6d00b590	33	The C name of the BFD target vector. The default is m68k_coff_vec.
252b5132 RH	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;
a1165289	146	default: internal->howto = NULL; break;
67a374a5	147	}
252b5132 RH	148	}
252b5132 RH	149
f4ffd778	150	STAT_REL int
2c3fc389	151	m68k_howto2rtype (reloc_howto_type * internal)
252b5132	152	{
b48499ec	153	if (internal->pc_relative)
252b5132	154	{
67a374a5 NC	155	switch (internal->bitsize)
	156	{
	157	case 32: return R_PCRLONG;
	158	case 16: return R_PCRWORD;
	159	case 8: return R_PCRBYTE;
	160	}
252b5132	161	}
b48499ec	162	else
67a374a5 NC	163	{
	164	switch (internal->bitsize)
	165	{
	166	case 32: return R_RELLONG;
	167	case 16: return R_RELWORD;
	168	case 8: return R_RELBYTE;
	169	}
	170	}
b48499ec	171	return R_RELLONG;
252b5132 RH	172	}
252b5132 RH	173
f4ffd778	174	STAT_REL reloc_howto_type *
2c3fc389 NC	175	m68k_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
2c3fc389 NC	176	bfd_reloc_code_real_type code)
252b5132 RH	177	{
	178	switch (code)
	179	{
	180	default: return NULL;
	181	case BFD_RELOC_8: return m68kcoff_howto_table + 0;
	182	case BFD_RELOC_16: return m68kcoff_howto_table + 1;
	183	case BFD_RELOC_CTOR:
	184	case BFD_RELOC_32: return m68kcoff_howto_table + 2;
	185	case BFD_RELOC_8_PCREL: return m68kcoff_howto_table + 3;
	186	case BFD_RELOC_16_PCREL: return m68kcoff_howto_table + 4;
	187	case BFD_RELOC_32_PCREL: return m68kcoff_howto_table + 5;
	188	/* FIXME: There doesn't seem to be a code for R_RELLONG_NEG. */
	189	}
	190	/NOTREACHED/
	191	}
	192
157090f7 AM	193	STAT_REL reloc_howto_type *
	194	m68k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
	195	const char *r_name)
	196	{
	197	unsigned int i;
	198
	199	for (i = 0;
	200	i < sizeof (m68kcoff_howto_table) / sizeof (m68kcoff_howto_table[0]);
	201	i++)
	202	if (m68kcoff_howto_table[i].name != NULL
	203	&& strcasecmp (m68kcoff_howto_table[i].name, r_name) == 0)
	204	return &m68kcoff_howto_table[i];
	205
	206	return NULL;
	207	}
	208
252b5132 RH	209	#endif /* not ONLY_DECLARE_RELOCS */
	210
	211	#define RTYPE2HOWTO(internal, relocentry) \
	212	m68k_rtype2howto(internal, (relocentry)->r_type)
	213
	214	#define SELECT_RELOC(external, internal) \
	215	external.r_type = m68k_howto2rtype (internal)
	216
	217	#define coff_bfd_reloc_type_lookup m68k_reloc_type_lookup
157090f7	218	#define coff_bfd_reloc_name_lookup m68k_reloc_name_lookup
252b5132 RH	219
	220	#ifndef COFF_COMMON_ADDEND
	221	#ifndef coff_rtype_to_howto
	222
	223	#define coff_rtype_to_howto m68kcoff_rtype_to_howto
	224
252b5132	225	static reloc_howto_type *
2c3fc389 NC	226	m68kcoff_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
	227	asection *sec,
	228	struct internal_reloc *rel,
	229	struct coff_link_hash_entry *h ATTRIBUTE_UNUSED,
	230	struct internal_syment *sym ATTRIBUTE_UNUSED,
	231	bfd_vma *addendp)
252b5132 RH	232	{
	233	arelent relent;
	234	reloc_howto_type *howto;
	235
40b1c6c5	236	relent.howto = NULL;
252b5132 RH	237	RTYPE2HOWTO (&relent, rel);
	238
	239	howto = relent.howto;
	240
40b1c6c5	241	if (howto != NULL && howto->pc_relative)
252b5132 RH	242	*addendp += sec->vma;
	243
	244	return howto;
	245	}
	246
	247	#endif /* ! defined (coff_rtype_to_howto) */
	248	#endif /* ! defined (COFF_COMMON_ADDEND) */
	249	\f
	250	#ifdef COFF_COMMON_ADDEND
	251
	252	/* If COFF_COMMON_ADDEND is defined, then when using m68k COFF the
	253	value stored in the .text section for a reference to a common
	254	symbol is the value itself plus any desired offset. (taken from
	255	work done by Ian Taylor, Cygnus Support, for I386 COFF). */
	256
1049f94e	257	/* If we are producing relocatable output, we need to do some
252b5132 RH	258	adjustments to the object file that are not done by the
	259	bfd_perform_relocation function. This function is called by every
	260	reloc type to make any required adjustments. */
	261
	262	static bfd_reloc_status_type
2c3fc389 NC	263	m68kcoff_common_addend_special_fn (bfd *abfd,
	264	arelent *reloc_entry,
	265	asymbol *symbol,
	266	void * data,
	267	asection *input_section ATTRIBUTE_UNUSED,
	268	bfd *output_bfd,
	269	char **error_message ATTRIBUTE_UNUSED)
252b5132 RH	270	{
	271	symvalue diff;
	272
	273	if (output_bfd == (bfd *) NULL)
	274	return bfd_reloc_continue;
	275
	276	if (bfd_is_com_section (symbol->section))
	277	{
	278	/* We are relocating a common symbol. The current value in the
	279	object file is ORIG + OFFSET, where ORIG is the value of the
	280	common symbol as seen by the object file when it was compiled
	281	(this may be zero if the symbol was undefined) and OFFSET is
	282	the offset into the common symbol (normally zero, but may be
	283	non-zero when referring to a field in a common structure).
	284	ORIG is the negative of reloc_entry->addend, which is set by
	285	the CALC_ADDEND macro below. We want to replace the value in
	286	the object file with NEW + OFFSET, where NEW is the value of
	287	the common symbol which we are going to put in the final
	288	object file. NEW is symbol->value. */
	289	diff = symbol->value + reloc_entry->addend;
	290	}
	291	else
	292	{
	293	/* For some reason bfd_perform_relocation always effectively
	294	ignores the addend for a COFF target when producing
1049f94e	295	relocatable output. This seems to be always wrong for 386
252b5132 RH	296	COFF, so we handle the addend here instead. */
	297	diff = reloc_entry->addend;
	298	}
	299
	300	#define DOIT(x) \
	301	x = ((x & ~howto->dst_mask) \| (((x & howto->src_mask) + diff) & howto->dst_mask))
	302
	303	if (diff != 0)
	304	{
	305	reloc_howto_type *howto = reloc_entry->howto;
	306	unsigned char addr = (unsigned char ) data + reloc_entry->address;
	307
	308	switch (howto->size)
	309	{
	310	case 0:
	311	{
	312	char x = bfd_get_8 (abfd, addr);
	313	DOIT (x);
	314	bfd_put_8 (abfd, x, addr);
	315	}
	316	break;
	317
	318	case 1:
	319	{
	320	short x = bfd_get_16 (abfd, addr);
	321	DOIT (x);
dc810e39	322	bfd_put_16 (abfd, (bfd_vma) x, addr);
252b5132 RH	323	}
	324	break;
	325
	326	case 2:
	327	{
	328	long x = bfd_get_32 (abfd, addr);
	329	DOIT (x);
dc810e39	330	bfd_put_32 (abfd, (bfd_vma) x, addr);
252b5132 RH	331	}
	332	break;
	333
	334	default:
	335	abort ();
	336	}
	337	}
	338
	339	/* Now let bfd_perform_relocation finish everything up. */
	340	return bfd_reloc_continue;
	341	}
	342
	343	/* Compute the addend of a reloc. If the reloc is to a common symbol,
	344	the object file contains the value of the common symbol. By the
	345	time this is called, the linker may be using a different symbol
	346	from a different object file with a different value. Therefore, we
	347	hack wildly to locate the original symbol from this file so that we
	348	can make the correct adjustment. This macro sets coffsym to the
	349	symbol from the original file, and uses it to set the addend value
	350	correctly. If this is not a common symbol, the usual addend
	351	calculation is done, except that an additional tweak is needed for
	352	PC relative relocs.
	353	FIXME: This macro refers to symbols and asect; these are from the
	354	calling function, not the macro arguments. */
	355
	356	#define CALC_ADDEND(abfd, ptr, reloc, cache_ptr) \
	357	{ \
	358	coff_symbol_type coffsym = (coff_symbol_type ) NULL; \
	359	if (ptr && bfd_asymbol_bfd (ptr) != abfd) \
	360	coffsym = (obj_symbols (abfd) \
	361	+ (cache_ptr->sym_ptr_ptr - symbols)); \
	362	else if (ptr) \
f4943d82	363	coffsym = coff_symbol_from (ptr); \
252b5132 RH	364	if (coffsym != (coff_symbol_type *) NULL \
	365	&& coffsym->native->u.syment.n_scnum == 0) \
	366	cache_ptr->addend = - coffsym->native->u.syment.n_value; \
	367	else if (ptr && bfd_asymbol_bfd (ptr) == abfd \
	368	&& ptr->section != (asection *) NULL) \
	369	cache_ptr->addend = - (ptr->section->vma + ptr->value); \
	370	else \
	371	cache_ptr->addend = 0; \
	372	if (ptr && (reloc.r_type == R_PCRBYTE \
	373	\|\| reloc.r_type == R_PCRWORD \
	374	\|\| reloc.r_type == R_PCRLONG)) \
	375	cache_ptr->addend += asect->vma; \
	376	}
	377
	378	#ifndef coff_rtype_to_howto
	379
	380	/* coff-m68k.c uses the special COFF backend linker. We need to
	381	adjust common symbols. */
	382
252b5132	383	static reloc_howto_type *
2c3fc389 NC	384	m68kcoff_common_addend_rtype_to_howto (bfd *abfd ATTRIBUTE_UNUSED,
	385	asection *sec,
	386	struct internal_reloc *rel,
	387	struct coff_link_hash_entry *h,
	388	struct internal_syment *sym,
	389	bfd_vma *addendp)
252b5132 RH	390	{
	391	arelent relent;
	392	reloc_howto_type *howto;
	393
1b0b5b1b	394	relent.howto = NULL;
252b5132 RH	395	RTYPE2HOWTO (&relent, rel);
	396
	397	howto = relent.howto;
	398
	399	if (howto->pc_relative)
	400	*addendp += sec->vma;
	401
	402	if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)
	403	{
	404	/* This is a common symbol. The section contents include the
	405	size (sym->n_value) as an addend. The relocate_section
	406	function will be adding in the final value of the symbol. We
	407	need to subtract out the current size in order to get the
	408	correct result. */
	409	BFD_ASSERT (h != NULL);
	410	*addendp -= sym->n_value;
	411	}
	412
	413	/* If the output symbol is common (in which case this must be a
1049f94e	414	relocatable link), we need to add in the final size of the
252b5132 RH	415	common symbol. */
	416	if (h != NULL && h->root.type == bfd_link_hash_common)
	417	*addendp += h->root.u.c.size;
	418
	419	return howto;
	420	}
	421
	422	#define coff_rtype_to_howto m68kcoff_common_addend_rtype_to_howto
	423
	424	#endif /* ! defined (coff_rtype_to_howto) */
	425
	426	#endif /* COFF_COMMON_ADDEND */
20bccb34 NC	427
	428	#if !defined ONLY_DECLARE_RELOCS && ! defined STATIC_RELOCS
	429	/* Given a .data section and a .emreloc in-memory section, store
	430	relocation information into the .emreloc section which can be
	431	used at runtime to relocate the section. This is called by the
	432	linker when the --embedded-relocs switch is used. This is called
	433	after the add_symbols entry point has been called for all the
	434	objects, and before the final_link entry point is called. */
	435
b34976b6	436	bfd_boolean
2c3fc389 NC	437	bfd_m68k_coff_create_embedded_relocs (bfd *abfd,
	438	struct bfd_link_info *info,
	439	asection *datasec,
	440	asection *relsec,
	441	char **errmsg)
20bccb34 NC	442	{
	443	char *extsyms;
	444	bfd_size_type symesz;
	445	struct internal_reloc irel, irelend;
	446	bfd_byte *p;
dc810e39	447	bfd_size_type amt;
20bccb34	448
0e1862bb	449	BFD_ASSERT (! bfd_link_relocatable (info));
20bccb34 NC	450
	451	*errmsg = NULL;
	452
	453	if (datasec->reloc_count == 0)
b34976b6	454	return TRUE;
20bccb34 NC	455
	456	extsyms = obj_coff_external_syms (abfd);
	457	symesz = bfd_coff_symesz (abfd);
	458
b34976b6	459	irel = _bfd_coff_read_internal_relocs (abfd, datasec, TRUE, NULL, FALSE,
20bccb34 NC	460	NULL);
	461	irelend = irel + datasec->reloc_count;
	462
dc810e39 AM	463	amt = (bfd_size_type) datasec->reloc_count * 12;
dc810e39 AM	464	relsec->contents = (bfd_byte *) bfd_alloc (abfd, amt);
20bccb34	465	if (relsec->contents == NULL)
b34976b6	466	return FALSE;
20bccb34 NC	467
	468	p = relsec->contents;
	469
	470	for (; irel < irelend; irel++, p += 12)
	471	{
	472	asection *targetsec;
	473
	474	/* We are going to write a four byte longword into the runtime
	475	reloc section. The longword will be the address in the data
	476	section which must be relocated. It is followed by the name
	477	of the target section NUL-padded or truncated to 8
	478	characters. */
	479
	480	/* We can only relocate absolute longword relocs at run time. */
	481	if (irel->r_type != R_RELLONG)
	482	{
	483	*errmsg = _("unsupported reloc type");
	484	bfd_set_error (bfd_error_bad_value);
b34976b6	485	return FALSE;
20bccb34 NC	486	}
	487
	488	if (irel->r_symndx == -1)
	489	targetsec = bfd_abs_section_ptr;
	490	else
	491	{
	492	struct coff_link_hash_entry *h;
b48499ec	493
20bccb34 NC	494	h = obj_coff_sym_hashes (abfd)[irel->r_symndx];
	495	if (h == NULL)
	496	{
	497	struct internal_syment isym;
b48499ec	498
20bccb34 NC	499	bfd_coff_swap_sym_in (abfd, extsyms + symesz * irel->r_symndx,
	500	&isym);
	501	targetsec = coff_section_from_bfd_index (abfd, isym.n_scnum);
	502	}
	503	else if (h->root.type == bfd_link_hash_defined
	504	\|\| h->root.type == bfd_link_hash_defweak)
	505	targetsec = h->root.u.def.section;
	506	else
	507	targetsec = NULL;
	508	}
b48499ec	509
20bccb34 NC	510	bfd_put_32 (abfd,
	511	(irel->r_vaddr - datasec->vma + datasec->output_offset), p);
	512	memset (p + 4, 0, 8);
ff0829fd	513	if (targetsec != NULL)
f075ee0c	514	strncpy ((char *) p + 4, targetsec->output_section->name, 8);
20bccb34	515	}
b48499ec	516
b34976b6	517	return TRUE;
20bccb34 NC	518	}
20bccb34 NC	519	#endif /* neither ONLY_DECLARE_RELOCS not STATIC_RELOCS */
252b5132 RH	520	\f
	521	#define coff_bfd_is_local_label_name m68k_coff_is_local_label_name
	522
	523	#define coff_relocate_section _bfd_coff_generic_relocate_section
	524
2b5c217d NC	525	#ifndef bfd_pe_print_pdata
	526	#define bfd_pe_print_pdata NULL
	527	#endif
	528
252b5132 RH	529	#include "coffcode.h"
	530
	531	#ifndef TARGET_SYM
6d00b590	532	#define TARGET_SYM m68k_coff_vec
252b5132 RH	533	#endif
	534
	535	#ifndef TARGET_NAME
	536	#define TARGET_NAME "coff-m68k"
	537	#endif
	538
252b5132	539	#ifdef NAMES_HAVE_UNDERSCORE
3fa78519	540	CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, '_', NULL, COFF_SWAP_TABLE)
252b5132	541	#else
3fa78519	542	CREATE_BIG_COFF_TARGET_VEC (TARGET_SYM, TARGET_NAME, D_PAGED, 0, 0, NULL, COFF_SWAP_TABLE)
252b5132	543	#endif