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/* BFD back-end for WDC 65816 COFF binaries.

   Copyright 1995, 1996, 1997, 1999, 2000, 2001 Free Software Foundation, Inc.

   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include "bfd.h"

#include "sysdep.h"

#include "libbfd.h"

#include "bfdlink.h"

#include "coff/w65.h"

#include "coff/internal.h"

#include "libcoff.h"

static int  select_reloc              PARAMS ((reloc_howto_type *));

static void rtype2howto               PARAMS ((arelent *, struct internal_reloc *));

static void reloc_processing          PARAMS ((arelent *, struct internal_reloc *, asymbol **, bfd *, asection *));

static int  w65_reloc16_estimate    PARAMS ((bfd *, asection *, arelent *, unsigned int, struct bfd_link_info *));

static void w65_reloc16_extra_cases PARAMS ((bfd *,struct bfd_link_info *, struct bfd_link_order *, arelent *, bfd_byte *, unsigned int *, unsigned int *));

#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)

static reloc_howto_type howto_table[] =

  {

    HOWTO (R_W65_ABS8,    0,  0, 8,  false, 0, complain_overflow_bitfield, 0, "abs8", true, 0x000000ff, 0x000000ff, false),

    HOWTO (R_W65_ABS16,   1,  0, 16, false, 0, complain_overflow_bitfield, 0, "abs16", true, 0x0000ffff, 0x0000ffff, false),

    HOWTO (R_W65_ABS24,   0,  2, 32, false, 0, complain_overflow_bitfield, 0, "abs24", true, 0x00ffffff, 0x00ffffff, false),

    HOWTO (R_W65_ABS8S8,  0,  0, 8,  false, 0, complain_overflow_bitfield, 0, ">abs8", true, 0x000000ff, 0x000000ff, false),

    HOWTO (R_W65_ABS8S16, 0,  0, 8,  false, 0, complain_overflow_bitfield, 0, "^abs8", true, 0x000000ff, 0x000000ff, false),

    HOWTO (R_W65_ABS16S8, 1,  0, 16, false, 0, complain_overflow_bitfield, 0, ">abs16", true, 0x0000ffff, 0x0000ffff, false),

    HOWTO (R_W65_ABS16S16,1,  0, 16, false, 0, complain_overflow_bitfield, 0, "^abs16", true, 0x0000ffff, 0x0000ffff, false),

    HOWTO (R_W65_PCR8,    0,  0, 8,  false, 0, complain_overflow_bitfield, 0, "pcrel8", true, 0x000000ff, 0x000000ff, true),

    HOWTO (R_W65_PCR16,   1,  0, 16, false, 0, complain_overflow_bitfield, 0, "pcrel16", true, 0x0000ffff, 0x0000ffff, true),

    HOWTO (R_W65_DP,      0,  0, 8,  false, 0, complain_overflow_bitfield, 0, "dp", true, 0x000000ff, 0x000000ff, false),

  };

/* Turn a howto into a reloc number.  */

#define SELECT_RELOC(x,howto) \

  { x.r_type = select_reloc(howto); }

#define BADMAG(x) (W65BADMAG(x))

#define W65 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';

static int

select_reloc (howto)

     reloc_howto_type *howto;

{

  return howto->type ;

}

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

static void

rtype2howto (internal, dst)

     arelent *internal;

     struct internal_reloc *dst;

{

  internal->howto = howto_table + dst->r_type - 1;

}

#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 (relent, reloc, symbols, abfd, section)

     arelent * relent;

     struct internal_reloc *reloc;

     asymbol ** symbols;

     bfd * abfd;

     asection * section;

{

  relent->address = reloc->r_vaddr;

  rtype2howto (relent, reloc);

  if (((int) reloc->r_symndx) > 0)

    relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];

  else

    relent->sym_ptr_ptr = (asymbol **)&(bfd_abs_symbol);

  relent->addend = reloc->r_offset;

  relent->address -= section->vma;

  /*  relent->section = 0;*/

}

static int

w65_reloc16_estimate (abfd, input_section, reloc, shrink, link_info)

     bfd *abfd;

     asection *input_section;

     arelent *reloc;

     unsigned int shrink;

     struct bfd_link_info *link_info;

{

  bfd_vma value;

  bfd_vma dot;

  bfd_vma gap;

  /* The address of the thing to be relocated will have moved back by

   the size of the shrink  - but we don't change reloc->address here,

   since we need it to know where the relocation lives in the source

   uncooked section.  */

  /*  reloc->address -= shrink;   conceptual */

  bfd_vma address = reloc->address - shrink;

  switch (reloc->howto->type)

    {

    case R_MOV16B2:

    case R_JMP2:

      shrink+=2;

      break;

      /* Thing is a move one byte.  */

    case R_MOV16B1:

      value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);

      if (value >= 0xff00)

        {

          /* Change the reloc type from 16bit, possible 8 to 8bit

             possible 16.  */

          reloc->howto = reloc->howto + 1;

          /* The place to relc moves back by one.  */

          /* This will be two bytes smaller in the long run.  */

          shrink += 2;

          bfd_perform_slip (abfd, 2, input_section, address);

        }

      break;

      /* This is the 24 bit branch which could become an 8 bitter,

         the relocation points to the first byte of the insn, not the

         actual data.  */

    case R_JMPL1:

      value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);

      dot = input_section->output_section->vma +

        input_section->output_offset + address;

      /* See if the address we're looking at within 127 bytes of where

         we are, if so then we can use a small branch rather than the

         jump we were going to.  */

      gap = value - dot;

      if (-120 < (long) gap && (long) gap < 120)

        {

          /* Change the reloc type from 24bit, possible 8 to 8bit

             possible 32.  */

          reloc->howto = reloc->howto + 1;

          /* This will be two bytes smaller in the long run.  */

          shrink += 2;

          bfd_perform_slip (abfd, 2, input_section, address);

        }

      break;

    case R_JMP1:

      value = bfd_coff_reloc16_get_value (reloc, link_info, input_section);

      dot = input_section->output_section->vma +

        input_section->output_offset + address;

      /* See if the address we're looking at within 127 bytes of where

         we are, if so then we can use a small branch rather than the

         jump we were going to.  */

      gap = value - (dot - shrink);

      if (-120 < (long) gap && (long) gap < 120)

        {

          /* Change the reloc type from 16bit, possible 8 to 8bit

             possible 16.  */

          reloc->howto = reloc->howto + 1;

          /* The place to relc moves back by one.  */

          /* This will be two bytes smaller in the long run.  */

          shrink += 2;

          bfd_perform_slip (abfd, 2, input_section, address);

        }

      break;

    }

  return shrink;

}

/* First phase of a relaxing link.  */

/* Reloc types

   large                small

   R_MOV16B1            R_MOV16B2       mov.b with 16bit or 8 bit address

   R_JMP1               R_JMP2          jmp or pcrel branch

   R_JMPL1              R_JMPL_B8       24jmp or pcrel branch

   R_MOV24B1            R_MOV24B2       24 or 8 bit reloc for mov.b  */

static void

w65_reloc16_extra_cases (abfd, link_info, link_order, reloc, data, src_ptr,

                           dst_ptr)

     bfd *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;

{

  unsigned int src_address = *src_ptr;

  unsigned int dst_address = *dst_ptr;

  asection *input_section = link_order->u.indirect.section;

  switch (reloc->howto->type)

    {

    case R_W65_ABS8:

    case R_W65_DP:

      {

        unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,

                                                       input_section);

        bfd_put_8 (abfd, gap, data + dst_address);

        dst_address += 1;

        src_address += 1;

      }

      break;

    case R_W65_ABS8S8:

      {

        unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,

                                                       input_section);

        gap >>= 8;

        bfd_put_8 (abfd, gap, data + dst_address);

        dst_address += 1;

        src_address += 1;

      }

      break;

    case R_W65_ABS8S16:

      {

        unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,

                                                       input_section);

        gap >>= 16;

        bfd_put_8 (abfd, gap, data + dst_address);

        dst_address += 1;

        src_address += 1;

      }

      break;

    case R_W65_ABS16:

      {

        unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,

                                                       input_section);

        bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);

        dst_address += 2;

        src_address += 2;

      }

      break;

    case R_W65_ABS16S8:

      {

        unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,

                                                       input_section);

        gap >>= 8;

        bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);

        dst_address += 2;

        src_address += 2;

      }

      break;

    case R_W65_ABS16S16:

      {

        unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,

                                                       input_section);

        gap >>= 16;

        bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);

        dst_address += 2;

        src_address += 2;

      }

      break;

    case R_W65_ABS24:

      {

        unsigned int gap = bfd_coff_reloc16_get_value (reloc, link_info,

                                                       input_section);

        bfd_put_16 (abfd, (bfd_vma) gap, data + dst_address);

        bfd_put_8 (abfd, gap >> 16, data+dst_address + 2);

        dst_address += 3;

        src_address += 3;

      }

      break;

    case R_W65_PCR8:

      {

        int gap = bfd_coff_reloc16_get_value (reloc, link_info,

                                              input_section);

        bfd_vma dot = link_order->offset

          + dst_address

            + link_order->u.indirect.section->output_section->vma;

        gap -= dot + 1;

        if (gap < -128 || gap > 127)

          {

            if (! ((*link_info->callbacks->reloc_overflow)

                   (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),

                    reloc->howto->name, reloc->addend, input_section->owner,

                    input_section, reloc->address)))

              abort ();

          }

        bfd_put_8 (abfd, gap, data + dst_address);

        dst_address += 1;

        src_address += 1;

      }

      break;

    case R_W65_PCR16:

      {

        bfd_vma gap = bfd_coff_reloc16_get_value (reloc, link_info,

                                                  input_section);

        bfd_vma dot = link_order->offset

          + dst_address

            + link_order->u.indirect.section->output_section->vma;

        /* This wraps within the page, so ignore the relativeness, look at the

           high part.  */

        if ((gap & 0xf0000) != (dot & 0xf0000))

          {

            if (! ((*link_info->callbacks->reloc_overflow)

                   (link_info, bfd_asymbol_name (*reloc->sym_ptr_ptr),

                    reloc->howto->name, reloc->addend, input_section->owner,

                    input_section, reloc->address)))

              abort ();

          }

        gap -= dot + 2;

        bfd_put_16 (abfd, gap, data + dst_address);

        dst_address += 2;

        src_address += 2;

      }

      break;

    default:

      printf (_("ignoring reloc %s\n"), reloc->howto->name);

      break;

    }

  *src_ptr = src_address;

  *dst_ptr = dst_address;

}

#define coff_reloc16_extra_cases w65_reloc16_extra_cases

#define coff_reloc16_estimate w65_reloc16_estimate

#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_LITTLE_COFF_TARGET_VEC (w65_vec, "coff-w65", BFD_IS_RELAXABLE, 0, '_', NULL)