/* BFD back-end for Zilog Z800n COFF binaries.
   Copyright 1992, 1993, 1994, 1995, 1997, 1999, 2000, 2001, 2002, 2003,
   2004 Free Software Foundation, Inc.
   Contributed by Cygnus Support.
   Written by Steve Chamberlain, <sac@cygnus.com>.

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 "bfdlink.h"
#include "coff/z8k.h"
#include "coff/internal.h"
#include "libcoff.h"

#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)

static reloc_howto_type r_imm32 =
HOWTO (R_IMM32, 0, 2, 32, FALSE, 0,
       complain_overflow_bitfield, 0, "r_imm32", TRUE, 0xffffffff,
       0xffffffff, FALSE);

static reloc_howto_type r_imm4l =
HOWTO (R_IMM4L, 0, 0, 4, FALSE, 0,
       complain_overflow_bitfield, 0, "r_imm4l", TRUE, 0xf, 0xf, FALSE);

static reloc_howto_type r_da =
HOWTO (R_IMM16, 0, 1, 16, FALSE, 0,
       complain_overflow_bitfield, 0, "r_da", TRUE, 0x0000ffff, 0x0000ffff,
       FALSE);

static reloc_howto_type r_imm8 =
HOWTO (R_IMM8, 0, 0, 8, FALSE, 0,
       complain_overflow_bitfield, 0, "r_imm8", TRUE, 0x000000ff, 0x000000ff,
       FALSE);

static reloc_howto_type r_rel16 =
HOWTO (R_REL16, 0, 1, 16, FALSE, 0,
       complain_overflow_bitfield, 0, "r_rel16", TRUE, 0x0000ffff, 0x0000ffff,
       TRUE);

static reloc_howto_type r_jr =
HOWTO (R_JR, 0, 0, 8, TRUE, 0, complain_overflow_signed, 0,
       "r_jr", TRUE, 0, 0, TRUE);

static reloc_howto_type r_disp7 =
HOWTO (R_DISP7, 0, 0, 7, TRUE, 0, complain_overflow_bitfield, 0,
       "r_disp7", TRUE, 0, 0, TRUE);

static reloc_howto_type r_callr =
HOWTO (R_CALLR, 0, 1, 12, TRUE, 0, complain_overflow_signed, 0,
       "r_callr", TRUE, 0xfff, 0xfff, TRUE);

/* Turn a howto into a reloc number */

static int
coff_z8k_select_reloc (reloc_howto_type *howto)
{
  return howto->type;
}

#define SELECT_RELOC(x,howto) x.r_type = coff_z8k_select_reloc(howto)

#define BADMAG(x) Z8KBADMAG(x)
#define Z8K 1			/* Customize coffcode.h */
#define __A_MAGIC_SET__

/* Code to swap in the reloc.  */
#define SWAP_IN_RELOC_OFFSET	H_GET_32
#define SWAP_OUT_RELOC_OFFSET	H_PUT_32
#define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
  dst->r_stuff[0] = 'S'; \
  dst->r_stuff[1] = 'C';

/* Code to turn a r_type into a howto ptr, uses the above howto table.  */

static void
rtype2howto (arelent *internal, struct internal_reloc *dst)
{
  switch (dst->r_type)
    {
    default:
      abort ();
      break;
    case R_IMM8:
      internal->howto = &r_imm8;
      break;
     case R_IMM16:
      internal->howto = &r_da;
      break;
    case R_JR:
      internal->howto = &r_jr;
      break;
    case R_DISP7:
      internal->howto = &r_disp7;
      break;
    case R_CALLR:
      internal->howto = &r_callr;
      break;
    case R_REL16:
      internal->howto = &r_rel16;
      break;
    case R_IMM32:
      internal->howto = &r_imm32;
      break;
    case R_IMM4L:
      internal->howto = &r_imm4l;
      break;
    }
}

#define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)

/* Perform any necessary magic to the addend in a reloc entry.  */

#define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
 cache_ptr->addend =  ext_reloc.r_offset;

#define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
 reloc_processing(relent, reloc, symbols, abfd, section)

static void
reloc_processing (arelent *relent,
                  struct internal_reloc *reloc,
                  asymbol **symbols,
                  bfd *abfd,
                  asection *section)
{
  relent->address = reloc->r_vaddr;
  rtype2howto (relent, reloc);

  if (reloc->r_symndx > 0)
    relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
  else
    relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;

  relent->addend = reloc->r_offset;
  relent->address -= section->vma;
}

static void
extra_case (bfd *in_abfd,
            struct bfd_link_info *link_info,
            struct bfd_link_order *link_order,
            arelent *reloc,
            bfd_byte *data,
            unsigned int *src_ptr,
            unsigned int *dst_ptr)
{
  asection * input_section = link_order->u.indirect.section;

  switch (reloc->howto->type)
    {
    case R_IMM8:
      bfd_put_8 (in_abfd,
		 bfd_coff_reloc16_get_value (reloc, link_info, input_section),
		 data + *dst_ptr);
      (*dst_ptr) += 1;
      (*src_ptr) += 1;
      break;

    case R_IMM32:
      /* If no flags are set, assume immediate value.  */
      if (! (*reloc->sym_ptr_ptr)->section->flags)
	{
	  bfd_put_32 (in_abfd,
		      bfd_coff_reloc16_get_value (reloc, link_info,
						  input_section),
		      data + *dst_ptr);
	}
      else
	{
	  bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
						    input_section);
	  /* Addresses are 23 bit, and the layout of those in a 32-bit
	     value is as follows:
	       1AAAAAAA xxxxxxxx AAAAAAAA AAAAAAAA
	     (A - address bits,  x - ignore).  */
	  dst = (dst & 0xffff) | ((dst & 0xff0000) << 8) | 0x80000000;
	  bfd_put_32 (in_abfd, dst, data + *dst_ptr);
	}
      (*dst_ptr) += 4;
      (*src_ptr) += 4;
      break;

    case R_IMM4L:
      bfd_put_8 (in_abfd,
		 ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
		  | (0x0f
		     & bfd_coff_reloc16_get_value (reloc, link_info,
						   input_section))),
		 data + *dst_ptr);
      (*dst_ptr) += 1;
      (*src_ptr) += 1;
      break;

    case R_IMM16:
      bfd_put_16 (in_abfd,
		  bfd_coff_reloc16_get_value (reloc, link_info, input_section),
		  data + *dst_ptr);
      (*dst_ptr) += 2;
      (*src_ptr) += 2;
      break;

    case R_JR:
      {
	bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
						  input_section);
	bfd_vma dot = (link_order->offset
		       + *dst_ptr
		       + input_section->output_section->vma);
	int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
                                     word and the pc's been incremented.  */

	if (gap & 1)
	  abort ();
	gap /= 2;
	if (gap > 128 || gap < -128)
	  {
	    if (! ((*link_info->callbacks->reloc_overflow)
		   (link_info, NULL,
		    bfd_asymbol_name (*reloc->sym_ptr_ptr),
		    reloc->howto->name, reloc->addend, input_section->owner,
		    input_section, reloc->address)))
	      abort ();
	  }
	bfd_put_8 (in_abfd, gap, data + *dst_ptr);
	(*dst_ptr)++;
	(*src_ptr)++;
	break;
      }

    case R_DISP7:
      {
	bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
						  input_section);
	bfd_vma dot = (link_order->offset
		       + *dst_ptr
		       + input_section->output_section->vma);
	int gap = dst - dot - 1;  /* -1, since we're in the odd byte of the
                                     word and the pc's been incremented.  */

	if (gap & 1)
	  abort ();
	gap /= 2;

	if (gap > 0 || gap < -127)
	  {
	    if (! ((*link_info->callbacks->reloc_overflow)
		   (link_info, NULL,
		    bfd_asymbol_name (*reloc->sym_ptr_ptr),
		    reloc->howto->name, reloc->addend, input_section->owner,
		    input_section, reloc->address)))
	      abort ();
	  }
	bfd_put_8 (in_abfd,
                   (bfd_get_8 ( in_abfd, data + *dst_ptr) & 0x80) + (-gap & 0x7f),
                   data + *dst_ptr);
	(*dst_ptr)++;
	(*src_ptr)++;
	break;
      }

    case R_CALLR:
      {
	bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
						  input_section);
	bfd_vma dot = (link_order->offset
		       + *dst_ptr
		       + input_section->output_section->vma);
	int gap = dst - dot - 2;

	if (gap & 1)
	  abort ();
	if (gap > 4096 || gap < -4095)
	  {
	    if (! ((*link_info->callbacks->reloc_overflow)
		   (link_info, NULL,
		    bfd_asymbol_name (*reloc->sym_ptr_ptr),
		    reloc->howto->name, reloc->addend, input_section->owner,
		    input_section, reloc->address)))
	      abort ();
	  }
	gap /= 2;
	bfd_put_16 (in_abfd,
                    (bfd_get_16 ( in_abfd, data + *dst_ptr) & 0xf000) | (-gap & 0x0fff),
                    data + *dst_ptr);
	(*dst_ptr) += 2;
	(*src_ptr) += 2;
	break;
      }

    case R_REL16:
      {
	bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
						  input_section);
	bfd_vma dot = (link_order->offset
		       + *dst_ptr
		       + input_section->output_section->vma);
	int gap = dst - dot - 2;

	if (gap > 32767 || gap < -32768)
	  {
	    if (! ((*link_info->callbacks->reloc_overflow)
		   (link_info, NULL,
		    bfd_asymbol_name (*reloc->sym_ptr_ptr),
		    reloc->howto->name, reloc->addend, input_section->owner,
		    input_section, reloc->address)))
	      abort ();
	  }
	bfd_put_16 (in_abfd, (bfd_vma) gap, data + *dst_ptr);
	(*dst_ptr) += 2;
	(*src_ptr) += 2;
	break;
      }

    default:
      abort ();
    }
}

#define coff_reloc16_extra_cases extra_case

#include "coffcode.h"

#undef  coff_bfd_get_relocated_section_contents
#undef coff_bfd_relax_section
#define coff_bfd_get_relocated_section_contents \
  bfd_coff_reloc16_get_relocated_section_contents
#define coff_bfd_relax_section bfd_coff_reloc16_relax_section

CREATE_BIG_COFF_TARGET_VEC (z8kcoff_vec, "coff-z8k", 0, 0, '_', NULL, COFF_SWAP_TABLE)
