/* BFD back-end for Zilog Z800n COFF binaries.

   Copyright (C) 1992-2025 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 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/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, 4, 32, false, 0,

       complain_overflow_bitfield, 0, "r_imm32", true, 0xffffffff,

       0xffffffff, false);

static reloc_howto_type r_imm4l =

HOWTO (R_IMM4L, 0, 1, 4, false, 0,

       complain_overflow_bitfield, 0, "r_imm4l", true, 0xf, 0xf, false);

static reloc_howto_type r_da =

HOWTO (R_IMM16, 0, 2, 16, false, 0,

       complain_overflow_bitfield, 0, "r_da", true, 0x0000ffff, 0x0000ffff,

       false);

static reloc_howto_type r_imm8 =

HOWTO (R_IMM8, 0, 1, 8, false, 0,

       complain_overflow_bitfield, 0, "r_imm8", true, 0x000000ff, 0x000000ff,

       false);

static reloc_howto_type r_rel16 =

HOWTO (R_REL16, 0, 2, 16, false, 0,

       complain_overflow_bitfield, 0, "r_rel16", true, 0x0000ffff, 0x0000ffff,

       true);

static reloc_howto_type r_jr =

HOWTO (R_JR, 1, 1, 8, true, 0, complain_overflow_signed, 0,

       "r_jr", true, 0xff, 0xff, true);

static reloc_howto_type r_disp7 =

HOWTO (R_DISP7, 0, 1, 7, true, 0, complain_overflow_bitfield, 0,

       "r_disp7", true, 0x7f, 0x7f, true);

static reloc_howto_type r_callr =

HOWTO (R_CALLR, 1, 2, 12, true, 0, complain_overflow_signed, 0,

       "r_callr", true, 0xfff, 0xfff, true);

#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:

      internal->howto = NULL;

      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)

static reloc_howto_type *

coff_z8k_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_da;

    case BFD_RELOC_32:    return & r_imm32;

    case BFD_RELOC_8_PCREL: return & r_jr;

    case BFD_RELOC_16_PCREL:  return & r_rel16;

    case BFD_RELOC_Z8K_DISP7: return & r_disp7;

    case BFD_RELOC_Z8K_CALLR: return & r_callr;

    case BFD_RELOC_Z8K_IMM4L: return & r_imm4l;

    default:      BFD_FAIL ();

      return 0;

    }

}

static reloc_howto_type *

coff_z8k_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_da.name, r_name) == 0)

    return &r_da;

  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_rel16.name, r_name) == 0)

    return &r_rel16;

  if (strcasecmp (r_disp7.name, r_name) == 0)

    return &r_disp7;

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

    return &r_callr;

  if (strcasecmp (r_imm4l.name, r_name) == 0)

    return &r_imm4l;

  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 == -1 || symbols == NULL)

    relent->sym_ptr_ptr = &bfd_abs_section_ptr->symbol;

  else if (reloc->r_symndx >= 0 && reloc->r_symndx < obj_conv_table_size (abfd))

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

  else

    {

      _bfd_error_handler

  /* xgettext:c-format */

  (_("%pB: warning: illegal symbol index %ld in relocs"),

   abfd, reloc->r_symndx);

      relent->sym_ptr_ptr = &bfd_abs_section_ptr->symbol;

    }

  relent->addend = reloc->r_offset;

  relent->address -= section->vma;

}

static bool

extra_case (bfd *in_abfd,

      struct bfd_link_info *link_info,

      struct bfd_link_order *link_order,

      arelent *reloc,

      bfd_byte *data,

      size_t *src_ptr,

      size_t *dst_ptr)

{

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

  bfd_size_type end = bfd_get_section_limit_octets (in_abfd, input_section);

  bfd_size_type reloc_size = bfd_get_reloc_size (reloc->howto);

  if (*src_ptr > end

      || reloc_size > end - *src_ptr)

    {

      link_info->callbacks->einfo

  /* xgettext:c-format */

  (_("%X%P: %pB(%pA): relocation \"%pR\" goes out of range\n"),

   in_abfd, input_section, reloc);

      return false;

    }

  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 = (*dst_ptr

           + input_section->output_offset

           + input_section->output_section->vma);

  /* -1, since we're in the odd byte of the word and the pc has

     been incremented.  */

  bfd_signed_vma gap = dst - dot - 1;

  if ((gap & 1) != 0 || gap > 254 || gap < -256)

    {

      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);

      return false;

    }

  bfd_put_8 (in_abfd, gap / 2, data + *dst_ptr);

  *dst_ptr += 1;

  *src_ptr += 1;

  break;

      }

    case R_DISP7:

      {

  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);

  bfd_signed_vma gap = dst - dot - 1;

  if ((gap & 1) != 0 || gap > 0 || gap < -254)

    {

      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);

      return false;

    }

  bfd_put_8 (in_abfd,

       ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0x80)

        + (-gap / 2 & 0x7f)),

       data + *dst_ptr);

  *dst_ptr += 1;

  *src_ptr += 1;

  break;

      }

    case R_CALLR:

      {

  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);

  bfd_signed_vma gap = dst - dot - 2;

  if ((gap & 1) != 0 || gap > 4096 || gap < -4095)

    {

      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);

      return false;

    }

  bfd_put_16 (in_abfd,

        ((bfd_get_16 (in_abfd, data + *dst_ptr) & 0xf000)

         | (-gap / 2 & 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 = (*dst_ptr

           + input_section->output_offset

           + input_section->output_section->vma);

  bfd_signed_vma gap = dst - dot - 2;

  if (gap > 32767 || gap < -32768)

    {

      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);

      return false;

    }

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

  *dst_ptr += 2;

  *src_ptr += 2;

  break;

      }

    default:

      link_info->callbacks->einfo

  /* xgettext:c-format */

  (_("%X%P: %pB(%pA): relocation \"%pR\" is not supported\n"),

   in_abfd, input_section, reloc);

      return false;

    }

  return true;

}

#define coff_reloc16_extra_cases    extra_case

#define coff_bfd_reloc_type_lookup  coff_z8k_reloc_type_lookup

#define coff_bfd_reloc_name_lookup coff_z8k_reloc_name_lookup

#ifndef bfd_pe_print_pdata

#define bfd_pe_print_pdata  NULL

#endif

#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_BIG_COFF_TARGET_VEC (z8k_coff_vec, "coff-z8k", 0, 0, '_', NULL, COFF_SWAP_TABLE)