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/* BFD back-end for Zilog Z80 COFF binaries.

   Copyright 2005, 2007 Free Software Foundation, Inc.

   Contributed by Arnold Metselaar <arnold_m@operamail.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 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 "bfdlink.h"

#include "coff/z80.h"

#include "coff/internal.h"

#include "libcoff.h"

#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0

static reloc_howto_type r_imm32 =

HOWTO (R_IMM32, 0, 1, 32, FALSE, 0,

       complain_overflow_dont, 0, "r_imm32", TRUE, 0xffffffff, 0xffffffff,

       FALSE);

static reloc_howto_type r_imm24 =

HOWTO (R_IMM24, 0, 1, 24, FALSE, 0,

       complain_overflow_dont, 0, "r_imm24", TRUE, 0x00ffffff, 0x00ffffff,

       FALSE);

static reloc_howto_type r_imm16 =

HOWTO (R_IMM16, 0, 1, 16, FALSE, 0,

       complain_overflow_dont, 0, "r_imm16", 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_jr =

HOWTO (R_JR, 0, 0, 8, TRUE, 0,

       complain_overflow_signed, 0, "r_jr", FALSE, 0, 0xFF,

       FALSE);

static reloc_howto_type r_off8 =

HOWTO (R_OFF8, 0, 0, 8, FALSE, 0,

       complain_overflow_signed, 0,"r_off8", FALSE, 0, 0xff,

       FALSE);

#define BADMAG(x) Z80BADMAG(x)

#define Z80 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_imm16;

      break;

    case R_IMM24:

      internal->howto = &r_imm24;

      break;

    case R_IMM32:

      internal->howto = &r_imm32;

      break;

    case R_JR:

      internal->howto = &r_jr;

      break;

    case R_OFF8:

      internal->howto = &r_off8;

      break;

    }

}

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

static reloc_howto_type *

coff_z80_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,

                            bfd_reloc_code_real_type code)

{

  switch (code)

    {

    case BFD_RELOC_8:           return & r_imm8;

    case BFD_RELOC_16:          return & r_imm16;

    case BFD_RELOC_24:          return & r_imm24;

    case BFD_RELOC_32:          return & r_imm32;

    case BFD_RELOC_8_PCREL:     return & r_jr;

    case BFD_RELOC_Z80_DISP8:   return & r_off8;

    default:                    BFD_FAIL ();

      return NULL;

    }

}

static reloc_howto_type *

coff_z80_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,

                            const char *r_name)

{

  if (strcasecmp (r_imm8.name, r_name) == 0)

    return &r_imm8;

  if (strcasecmp (r_imm16.name, r_name) == 0)

    return &r_imm16;

  if (strcasecmp (r_imm24.name, r_name) == 0)

    return &r_imm24;

  if (strcasecmp (r_imm32.name, r_name) == 0)

    return &r_imm32;

  if (strcasecmp (r_jr.name, r_name) == 0)

    return &r_jr;

  if (strcasecmp (r_off8.name, r_name) == 0)

    return &r_off8;

  return NULL;

}

/* 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;

  int val;

  switch (reloc->howto->type)

    {

    case R_OFF8:

        val = bfd_coff_reloc16_get_value (reloc, link_info,

                                           input_section);

        if (val>127 || val<-128) /* Test for overflow.  */

          {

            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, val, data + *dst_ptr);

        (*dst_ptr) += 1;

        (*src_ptr) += 1;

      break;

    case R_IMM8:

      val = bfd_get_8 ( in_abfd, data+*src_ptr)

        + bfd_coff_reloc16_get_value (reloc, link_info, input_section);

      bfd_put_8 (in_abfd, val, data + *dst_ptr);

      (*dst_ptr) += 1;

      (*src_ptr) += 1;

      break;

    case R_IMM16:

      val = bfd_get_16 ( in_abfd, data+*src_ptr)

        + bfd_coff_reloc16_get_value (reloc, link_info, input_section);

      bfd_put_16 (in_abfd, val, data + *dst_ptr);

      (*dst_ptr) += 2;

      (*src_ptr) += 2;

      break;

    case R_IMM24:

      val = bfd_get_16 ( in_abfd, data+*src_ptr)

        + (bfd_get_8 ( in_abfd, data+*src_ptr+2) << 16)

        + bfd_coff_reloc16_get_value (reloc, link_info, input_section);

      bfd_put_16 (in_abfd, val, data + *dst_ptr);

      bfd_put_8 (in_abfd, val >> 16, data + *dst_ptr+2);

      (*dst_ptr) += 3;

      (*src_ptr) += 3;

      break;

    case R_IMM32:

      val = bfd_get_32 ( in_abfd, data+*src_ptr)

        + bfd_coff_reloc16_get_value (reloc, link_info, input_section);

      bfd_put_32 (in_abfd, val, data + *dst_ptr);

      (*dst_ptr) += 4;

      (*src_ptr) += 4;

      break;

    case R_JR:

      {

        bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,

                                                  input_section);

        bfd_vma dot = (*dst_ptr

                       + input_section->output_offset

                       + input_section->output_section->vma);

        int gap = dst - dot - 1;  /* -1, Since the offset is relative

                                     to the value of PC after reading

                                     the offset.  */

        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;

      }

    default:

      abort ();

    }

}

#define coff_reloc16_extra_cases    extra_case

#define coff_bfd_reloc_type_lookup  coff_z80_reloc_type_lookup

#define coff_bfd_reloc_name_lookup coff_z80_reloc_name_lookup

#include "coffcode.h"

#undef  coff_bfd_get_relocated_section_contents

#define coff_bfd_get_relocated_section_contents \

  bfd_coff_reloc16_get_relocated_section_contents

#undef  coff_bfd_relax_section

#define coff_bfd_relax_section bfd_coff_reloc16_relax_section

CREATE_LITTLE_COFF_TARGET_VEC (z80coff_vec, "coff-z80", 0, 0, '\0', NULL,

                               COFF_SWAP_TABLE)