/* BFD back-end for Renesas H8/300 ELF binaries.
   Copyright (C) 1993-2014 Free Software Foundation, Inc.

   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 "elf-bfd.h"
#include "elf/h8.h"

static reloc_howto_type *elf32_h8_reloc_type_lookup
  (bfd *abfd, bfd_reloc_code_real_type code);
static void elf32_h8_info_to_howto
  (bfd *, arelent *, Elf_Internal_Rela *);
static void elf32_h8_info_to_howto_rel
  (bfd *, arelent *, Elf_Internal_Rela *);
static unsigned long elf32_h8_mach (flagword);
static void elf32_h8_final_write_processing (bfd *, bfd_boolean);
static bfd_boolean elf32_h8_object_p (bfd *);
static bfd_boolean elf32_h8_merge_private_bfd_data (bfd *, bfd *);
static bfd_boolean elf32_h8_relax_section
  (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
static bfd_boolean elf32_h8_relax_delete_bytes
  (bfd *, asection *, bfd_vma, int);
static bfd_boolean elf32_h8_symbol_address_p (bfd *, asection *, bfd_vma);
static bfd_byte *elf32_h8_get_relocated_section_contents
  (bfd *, struct bfd_link_info *, struct bfd_link_order *,
   bfd_byte *, bfd_boolean, asymbol **);
static bfd_reloc_status_type elf32_h8_final_link_relocate
  (unsigned long, bfd *, bfd *, asection *,
   bfd_byte *, bfd_vma, bfd_vma, bfd_vma,
   struct bfd_link_info *, asection *, int);
static bfd_boolean elf32_h8_relocate_section
  (bfd *, struct bfd_link_info *, bfd *, asection *,
   bfd_byte *, Elf_Internal_Rela *,
   Elf_Internal_Sym *, asection **);
static bfd_reloc_status_type special
  (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **);

/* This does not include any relocation information, but should be
   good enough for GDB or objdump to read the file.  */

static reloc_howto_type h8_elf_howto_table[] =
{
#define R_H8_NONE_X 0
  HOWTO (R_H8_NONE,		/* type */
	 0,			/* rightshift */
	 3,			/* size (0 = byte, 1 = short, 2 = long) */
	 0,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 special,		/* special_function */
	 "R_H8_NONE",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 FALSE),		/* pcrel_offset */
#define R_H8_DIR32_X (R_H8_NONE_X + 1)
  HOWTO (R_H8_DIR32,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 special,		/* special_function */
	 "R_H8_DIR32",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xffffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
#define R_H8_DIR16_X (R_H8_DIR32_X + 1)
  HOWTO (R_H8_DIR16,		/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 special,		/* special_function */
	 "R_H8_DIR16",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0x0000ffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
#define R_H8_DIR8_X (R_H8_DIR16_X + 1)
  HOWTO (R_H8_DIR8,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 special,		/* special_function */
	 "R_H8_DIR8",		/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0x000000ff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
#define R_H8_DIR16A8_X (R_H8_DIR8_X + 1)
  HOWTO (R_H8_DIR16A8,		/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 special,		/* special_function */
	 "R_H8_DIR16A8",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0x0000ffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
#define R_H8_DIR16R8_X (R_H8_DIR16A8_X + 1)
  HOWTO (R_H8_DIR16R8,		/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 special,		/* special_function */
	 "R_H8_DIR16R8",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0x0000ffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
#define R_H8_DIR24A8_X (R_H8_DIR16R8_X + 1)
  HOWTO (R_H8_DIR24A8,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 24,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 special,		/* special_function */
	 "R_H8_DIR24A8",	/* name */
	 TRUE,			/* partial_inplace */
	 0xff000000,		/* src_mask */
	 0x00ffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
#define R_H8_DIR24R8_X (R_H8_DIR24A8_X + 1)
  HOWTO (R_H8_DIR24R8,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 24,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield, /* complain_on_overflow */
	 special,		/* special_function */
	 "R_H8_DIR24R8",	/* name */
	 TRUE,			/* partial_inplace */
	 0xff000000,		/* src_mask */
	 0x00ffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
#define R_H8_DIR32A16_X (R_H8_DIR24R8_X + 1)
  HOWTO (R_H8_DIR32A16,		/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 special,		/* special_function */
	 "R_H8_DIR32A16",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xffffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
#define R_H8_DISP32A16_X (R_H8_DIR32A16_X + 1)
  HOWTO (R_H8_DISP32A16,	/* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 special,		/* special_function */
	 "R_H8_DISP32A16",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0xffffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
#define R_H8_PCREL16_X (R_H8_DISP32A16_X + 1)
  HOWTO (R_H8_PCREL16,		/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 16,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed,/* complain_on_overflow */
	 special,		/* special_function */
	 "R_H8_PCREL16",	/* name */
	 FALSE,			/* partial_inplace */
	 0xffff,		/* src_mask */
	 0xffff,		/* dst_mask */
	 TRUE),			/* pcrel_offset */
#define R_H8_PCREL8_X (R_H8_PCREL16_X + 1)
  HOWTO (R_H8_PCREL8,		/* type */
	 0,			/* rightshift */
	 0,			/* size (0 = byte, 1 = short, 2 = long) */
	 8,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_signed,/* complain_on_overflow */
	 special,		/* special_function */
	 "R_H8_PCREL8",		/* name */
	 FALSE,			/* partial_inplace */
	 0xff,			/* src_mask */
	 0xff,			/* dst_mask */
	 TRUE),			/* pcrel_offset */
};

/* This structure is used to map BFD reloc codes to H8 ELF relocs.  */

struct elf_reloc_map {
  bfd_reloc_code_real_type bfd_reloc_val;
  unsigned char howto_index;
};

/* An array mapping BFD reloc codes to H8 ELF relocs.  */

static const struct elf_reloc_map h8_reloc_map[] = {
  { BFD_RELOC_NONE, R_H8_NONE_X },
  { BFD_RELOC_32, R_H8_DIR32_X },
  { BFD_RELOC_16, R_H8_DIR16_X },
  { BFD_RELOC_8, R_H8_DIR8_X },
  { BFD_RELOC_H8_DIR16A8, R_H8_DIR16A8_X },
  { BFD_RELOC_H8_DIR16R8, R_H8_DIR16R8_X },
  { BFD_RELOC_H8_DIR24A8, R_H8_DIR24A8_X },
  { BFD_RELOC_H8_DIR24R8, R_H8_DIR24R8_X },
  { BFD_RELOC_H8_DIR32A16, R_H8_DIR32A16_X },
  { BFD_RELOC_H8_DISP32A16, R_H8_DISP32A16_X },
  { BFD_RELOC_16_PCREL, R_H8_PCREL16_X },
  { BFD_RELOC_8_PCREL, R_H8_PCREL8_X },
};


static reloc_howto_type *
elf32_h8_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
			    bfd_reloc_code_real_type code)
{
  unsigned int i;

  for (i = 0; i < sizeof (h8_reloc_map) / sizeof (struct elf_reloc_map); i++)
    {
      if (h8_reloc_map[i].bfd_reloc_val == code)
	return &h8_elf_howto_table[(int) h8_reloc_map[i].howto_index];
    }
  return NULL;
}

static reloc_howto_type *
elf32_h8_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
			    const char *r_name)
{
  unsigned int i;

  for (i = 0;
       i < sizeof (h8_elf_howto_table) / sizeof (h8_elf_howto_table[0]);
       i++)
    if (h8_elf_howto_table[i].name != NULL
	&& strcasecmp (h8_elf_howto_table[i].name, r_name) == 0)
      return &h8_elf_howto_table[i];

  return NULL;
}

static void
elf32_h8_info_to_howto (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc,
			Elf_Internal_Rela *elf_reloc)
{
  unsigned int r;
  unsigned int i;

  r = ELF32_R_TYPE (elf_reloc->r_info);
  for (i = 0; i < sizeof (h8_elf_howto_table) / sizeof (reloc_howto_type); i++)
    if (h8_elf_howto_table[i].type == r)
      {
	bfd_reloc->howto = &h8_elf_howto_table[i];
	return;
      }
  abort ();
}

static void
elf32_h8_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, arelent *bfd_reloc,
			    Elf_Internal_Rela *elf_reloc ATTRIBUTE_UNUSED)
{
  unsigned int r;

  abort ();
  r = ELF32_R_TYPE (elf_reloc->r_info);
  bfd_reloc->howto = &h8_elf_howto_table[r];
}

/* Special handling for H8/300 relocs.
   We only come here for pcrel stuff and return normally if not an -r link.
   When doing -r, we can't do any arithmetic for the pcrel stuff, because
   we support relaxing on the H8/300 series chips.  */
static bfd_reloc_status_type
special (bfd *abfd ATTRIBUTE_UNUSED,
	 arelent *reloc_entry ATTRIBUTE_UNUSED,
	 asymbol *symbol ATTRIBUTE_UNUSED,
	 void * data ATTRIBUTE_UNUSED,
	 asection *input_section ATTRIBUTE_UNUSED,
	 bfd *output_bfd,
	 char **error_message ATTRIBUTE_UNUSED)
{
  if (output_bfd == (bfd *) NULL)
    return bfd_reloc_continue;

  /* Adjust the reloc address to that in the output section.  */
  reloc_entry->address += input_section->output_offset;
  return bfd_reloc_ok;
}

/* Perform a relocation as part of a final link.  */
static bfd_reloc_status_type
elf32_h8_final_link_relocate (unsigned long r_type, bfd *input_bfd,
			      bfd *output_bfd ATTRIBUTE_UNUSED,
			      asection *input_section ATTRIBUTE_UNUSED,
			      bfd_byte *contents, bfd_vma offset,
			      bfd_vma value, bfd_vma addend,
			      struct bfd_link_info *info ATTRIBUTE_UNUSED,
			      asection *sym_sec ATTRIBUTE_UNUSED,
			      int is_local ATTRIBUTE_UNUSED)
{
  bfd_byte *hit_data = contents + offset;

  switch (r_type)
    {
    case R_H8_NONE:
      return bfd_reloc_ok;

    case R_H8_DIR32:
    case R_H8_DIR32A16:
    case R_H8_DISP32A16:
    case R_H8_DIR24A8:
      value += addend;
      bfd_put_32 (input_bfd, value, hit_data);
      return bfd_reloc_ok;

    case R_H8_DIR16:
    case R_H8_DIR16A8:
    case R_H8_DIR16R8:
      value += addend;
      bfd_put_16 (input_bfd, value, hit_data);
      return bfd_reloc_ok;

    /* AKA R_RELBYTE */
    case R_H8_DIR8:
      value += addend;

      bfd_put_8 (input_bfd, value, hit_data);
      return bfd_reloc_ok;

    case R_H8_DIR24R8:
      value += addend;

      /* HIT_DATA is the address for the first byte for the relocated
	 value.  Subtract 1 so that we can manipulate the data in 32-bit
	 hunks.  */
      hit_data--;

      /* Clear out the top byte in value.  */
      value &= 0xffffff;

      /* Retrieve the type byte for value from the section contents.  */
      value |= (bfd_get_32 (input_bfd, hit_data) & 0xff000000);

      /* Now scribble it out in one 32-bit hunk.  */
      bfd_put_32 (input_bfd, value, hit_data);
      return bfd_reloc_ok;

    case R_H8_PCREL16:
      value -= (input_section->output_section->vma
		+ input_section->output_offset);
      value -= offset;
      value += addend;

      /* The value is relative to the start of the instruction,
	 not the relocation offset.  Subtract 2 to account for
	 this minor issue.  */
      value -= 2;

      bfd_put_16 (input_bfd, value, hit_data);
      return bfd_reloc_ok;

    case R_H8_PCREL8:
      value -= (input_section->output_section->vma
		+ input_section->output_offset);
      value -= offset;
      value += addend;

      /* The value is relative to the start of the instruction,
	 not the relocation offset.  Subtract 1 to account for
	 this minor issue.  */
      value -= 1;

      bfd_put_8 (input_bfd, value, hit_data);
      return bfd_reloc_ok;

    default:
      return bfd_reloc_notsupported;
    }
}

/* Relocate an H8 ELF section.  */
static bfd_boolean
elf32_h8_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
			   bfd *input_bfd, asection *input_section,
			   bfd_byte *contents, Elf_Internal_Rela *relocs,
			   Elf_Internal_Sym *local_syms,
			   asection **local_sections)
{
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes;
  Elf_Internal_Rela *rel, *relend;

  symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (input_bfd);

  rel = relocs;
  relend = relocs + input_section->reloc_count;
  for (; rel < relend; rel++)
    {
      unsigned int r_type;
      unsigned long r_symndx;
      Elf_Internal_Sym *sym;
      asection *sec;
      struct elf_link_hash_entry *h;
      bfd_vma relocation;
      bfd_reloc_status_type r;
      arelent bfd_reloc;
      reloc_howto_type *howto;

      elf32_h8_info_to_howto (input_bfd, &bfd_reloc, rel);
      howto = bfd_reloc.howto;

      r_symndx = ELF32_R_SYM (rel->r_info);
      r_type = ELF32_R_TYPE (rel->r_info);
      h = NULL;
      sym = NULL;
      sec = NULL;
      if (r_symndx < symtab_hdr->sh_info)
	{
	  sym = local_syms + r_symndx;
	  sec = local_sections[r_symndx];
	  relocation = _bfd_elf_rela_local_sym (output_bfd, sym, &sec, rel);
	}
      else
	{
	  bfd_boolean unresolved_reloc, warned, ignored;

	  RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
				   r_symndx, symtab_hdr, sym_hashes,
				   h, sec, relocation,
				   unresolved_reloc, warned, ignored);
	}

      if (sec != NULL && discarded_section (sec))
	RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
					 rel, 1, relend, howto, 0, contents);

      if (info->relocatable)
	continue;

      r = elf32_h8_final_link_relocate (r_type, input_bfd, output_bfd,
					input_section,
					contents, rel->r_offset,
					relocation, rel->r_addend,
					info, sec, h == NULL);

      if (r != bfd_reloc_ok)
	{
	  const char *name;
	  const char *msg = (const char *) 0;

	  if (h != NULL)
	    name = h->root.root.string;
	  else
	    {
	      name = (bfd_elf_string_from_elf_section
		      (input_bfd, symtab_hdr->sh_link, sym->st_name));
	      if (name == NULL || *name == '\0')
		name = bfd_section_name (input_bfd, sec);
	    }

	  switch (r)
	    {
	    case bfd_reloc_overflow:
	      if (! ((*info->callbacks->reloc_overflow)
		     (info, (h ? &h->root : NULL), name, howto->name,
		      (bfd_vma) 0, input_bfd, input_section,
		      rel->r_offset)))
		return FALSE;
	      break;

	    case bfd_reloc_undefined:
	      if (! ((*info->callbacks->undefined_symbol)
		     (info, name, input_bfd, input_section,
		      rel->r_offset, TRUE)))
		return FALSE;
	      break;

	    case bfd_reloc_outofrange:
	      msg = _("internal error: out of range error");
	      goto common_error;

	    case bfd_reloc_notsupported:
	      msg = _("internal error: unsupported relocation error");
	      goto common_error;

	    case bfd_reloc_dangerous:
	      msg = _("internal error: dangerous error");
	      goto common_error;

	    default:
	      msg = _("internal error: unknown error");
	      /* fall through */

	    common_error:
	      if (!((*info->callbacks->warning)
		    (info, msg, name, input_bfd, input_section,
		     rel->r_offset)))
		return FALSE;
	      break;
	    }
	}
    }

  return TRUE;
}

/* Object files encode the specific H8 model they were compiled
   for in the ELF flags field.

   Examine that field and return the proper BFD machine type for
   the object file.  */
static unsigned long
elf32_h8_mach (flagword flags)
{
  switch (flags & EF_H8_MACH)
    {
    case E_H8_MACH_H8300:
    default:
      return bfd_mach_h8300;

    case E_H8_MACH_H8300H:
      return bfd_mach_h8300h;

    case E_H8_MACH_H8300S:
      return bfd_mach_h8300s;

    case E_H8_MACH_H8300HN:
      return bfd_mach_h8300hn;

    case E_H8_MACH_H8300SN:
      return bfd_mach_h8300sn;

    case E_H8_MACH_H8300SX:
      return bfd_mach_h8300sx;

    case E_H8_MACH_H8300SXN:
      return bfd_mach_h8300sxn;
    }
}

/* The final processing done just before writing out a H8 ELF object
   file.  We use this opportunity to encode the BFD machine type
   into the flags field in the object file.  */

static void
elf32_h8_final_write_processing (bfd *abfd,
				 bfd_boolean linker ATTRIBUTE_UNUSED)
{
  unsigned long val;

  switch (bfd_get_mach (abfd))
    {
    default:
    case bfd_mach_h8300:
      val = E_H8_MACH_H8300;
      break;

    case bfd_mach_h8300h:
      val = E_H8_MACH_H8300H;
      break;

    case bfd_mach_h8300s:
      val = E_H8_MACH_H8300S;
      break;

    case bfd_mach_h8300hn:
      val = E_H8_MACH_H8300HN;
      break;

    case bfd_mach_h8300sn:
      val = E_H8_MACH_H8300SN;
      break;

    case bfd_mach_h8300sx:
      val = E_H8_MACH_H8300SX;
      break;

    case bfd_mach_h8300sxn:
      val = E_H8_MACH_H8300SXN;
      break;
    }

  elf_elfheader (abfd)->e_flags &= ~ (EF_H8_MACH);
  elf_elfheader (abfd)->e_flags |= val;
}

/* Return nonzero if ABFD represents a valid H8 ELF object file; also
   record the encoded machine type found in the ELF flags.  */

static bfd_boolean
elf32_h8_object_p (bfd *abfd)
{
  bfd_default_set_arch_mach (abfd, bfd_arch_h8300,
			     elf32_h8_mach (elf_elfheader (abfd)->e_flags));
  return TRUE;
}

/* Merge backend specific data from an object file to the output
   object file when linking.  The only data we need to copy at this
   time is the architecture/machine information.  */

static bfd_boolean
elf32_h8_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
{
  if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour
      || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
    return TRUE;

  if (bfd_get_arch (obfd) == bfd_get_arch (ibfd)
      && bfd_get_mach (obfd) < bfd_get_mach (ibfd))
    {
      if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd),
			       bfd_get_mach (ibfd)))
	return FALSE;
    }

  return TRUE;
}

/* This function handles relaxing for the H8..

   There are a few relaxing opportunities available on the H8:

     jmp/jsr:24    ->    bra/bsr:8		2 bytes
     The jmp may be completely eliminated if the previous insn is a
     conditional branch to the insn after the jump.  In that case
     we invert the branch and delete the jump and save 4 bytes.

     bCC:16          ->    bCC:8                  2 bytes
     bsr:16          ->    bsr:8                  2 bytes

     bset:16	     ->    bset:8                 2 bytes
     bset:24/32	     ->    bset:8                 4 bytes
     (also applicable to other bit manipulation instructions)

     mov.b:16	     ->    mov.b:8                2 bytes
     mov.b:24/32     ->    mov.b:8                4 bytes

     bset:24/32	     ->    bset:16                2 bytes
     (also applicable to other bit manipulation instructions)

     mov.[bwl]:24/32 ->    mov.[bwl]:16           2 bytes

     mov.[bwl] @(displ:24/32+ERx) -> mov.[bwl] @(displ:16+ERx)  4 bytes.  */

static bfd_boolean
elf32_h8_relax_section (bfd *abfd, asection *sec,
			struct bfd_link_info *link_info, bfd_boolean *again)
{
  Elf_Internal_Shdr *symtab_hdr;
  Elf_Internal_Rela *internal_relocs;
  Elf_Internal_Rela *irel, *irelend;
  bfd_byte *contents = NULL;
  Elf_Internal_Sym *isymbuf = NULL;
  static asection *last_input_section = NULL;
  static Elf_Internal_Rela *last_reloc = NULL;

  /* Assume nothing changes.  */
  *again = FALSE;

  /* We don't have to do anything for a relocatable link, if
     this section does not have relocs, or if this is not a
     code section.  */
  if (link_info->relocatable
      || (sec->flags & SEC_RELOC) == 0
      || sec->reloc_count == 0
      || (sec->flags & SEC_CODE) == 0)
    return TRUE;

  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;

  /* Get a copy of the native relocations.  */
  internal_relocs = (_bfd_elf_link_read_relocs
		     (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
		      link_info->keep_memory));
  if (internal_relocs == NULL)
    goto error_return;

  if (sec != last_input_section)
    last_reloc = NULL;

  last_input_section = sec;

  /* Walk through the relocs looking for relaxing opportunities.  */
  irelend = internal_relocs + sec->reloc_count;
  for (irel = internal_relocs; irel < irelend; irel++)
    {
      bfd_vma symval;

      {
	arelent bfd_reloc;

	elf32_h8_info_to_howto (abfd, &bfd_reloc, irel);
      }
      /* Keep track of the previous reloc so that we can delete
	 some long jumps created by the compiler.  */
      if (irel != internal_relocs)
	last_reloc = irel - 1;
      
      switch(ELF32_R_TYPE (irel->r_info))
	{
	case R_H8_DIR24R8:
	case R_H8_PCREL16:
	case R_H8_DIR16A8:
	case R_H8_DIR24A8:
	case R_H8_DIR32A16:
	case R_H8_DISP32A16:
	  break;
	default:
	  continue;
	}

      /* Get the section contents if we haven't done so already.  */
      if (contents == NULL)
	{
	  /* Get cached copy if it exists.  */
	  if (elf_section_data (sec)->this_hdr.contents != NULL)
	    contents = elf_section_data (sec)->this_hdr.contents;
	  else
	    {
	      /* Go get them off disk.  */
	      if (!bfd_malloc_and_get_section (abfd, sec, &contents))
		goto error_return;
	    }
	}

      /* Read this BFD's local symbols if we haven't done so already.  */
      if (isymbuf == NULL && symtab_hdr->sh_info != 0)
	{
	  isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
	  if (isymbuf == NULL)
	    isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
					    symtab_hdr->sh_info, 0,
					    NULL, NULL, NULL);
	  if (isymbuf == NULL)
	    goto error_return;
	}

      /* Get the value of the symbol referred to by the reloc.  */
      if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
	{
	  /* A local symbol.  */
	  Elf_Internal_Sym *isym;
	  asection *sym_sec;

	  isym = isymbuf + ELF32_R_SYM (irel->r_info);
	  sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
	  symval = isym->st_value;
	  /* If the reloc is absolute, it will not have
	     a symbol or section associated with it.  */
	  if (sym_sec)
	    symval += sym_sec->output_section->vma
	      + sym_sec->output_offset;
	}
      else
	{
	  unsigned long indx;
	  struct elf_link_hash_entry *h;

	  /* An external symbol.  */
	  indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info;
	  h = elf_sym_hashes (abfd)[indx];
	  BFD_ASSERT (h != NULL);
	  if (h->root.type != bfd_link_hash_defined
	      && h->root.type != bfd_link_hash_defweak)
	    {
	      /* This appears to be a reference to an undefined
                 symbol.  Just ignore it--it will be caught by the
                 regular reloc processing.  */
	      continue;
	    }

	  symval = (h->root.u.def.value
		    + h->root.u.def.section->output_section->vma
		    + h->root.u.def.section->output_offset);
	}

      /* For simplicity of coding, we are going to modify the section
	 contents, the section relocs, and the BFD symbol table.  We
	 must tell the rest of the code not to free up this
	 information.  It would be possible to instead create a table
	 of changes which have to be made, as is done in coff-mips.c;
	 that would be more work, but would require less memory when
	 the linker is run.  */
      switch (ELF32_R_TYPE (irel->r_info))
	{
	  /* Try to turn a 24-bit absolute branch/call into an 8-bit
	     pc-relative branch/call.  */
	case R_H8_DIR24R8:
	  {
	    bfd_vma value = symval + irel->r_addend;
	    bfd_vma dot, gap;

	    /* Get the address of this instruction.  */
	    dot = (sec->output_section->vma
		   + sec->output_offset + irel->r_offset - 1);

	    /* Compute the distance from this insn to the branch target.  */
	    gap = value - dot;

	    /* If the distance is within -126..+130 inclusive, then we can
	       relax this jump.  +130 is valid since the target will move
	       two bytes closer if we do relax this branch.  */
	    if ((int) gap >= -126 && (int) gap <= 130)
	      {
		unsigned char code;

		/* Note that we've changed the relocs, section contents,
		   etc.  */
		elf_section_data (sec)->relocs = internal_relocs;
		elf_section_data (sec)->this_hdr.contents = contents;
		symtab_hdr->contents = (unsigned char *) isymbuf;

		/* Get the instruction code being relaxed.  */
		code = bfd_get_8 (abfd, contents + irel->r_offset - 1);

		/* If the previous instruction conditionally jumped around
		   this instruction, we may be able to reverse the condition
		   and redirect the previous instruction to the target of
		   this instruction.

		   Such sequences are used by the compiler to deal with
		   long conditional branches.

		   Only perform this optimisation for jumps (code 0x5a) not
		   subroutine calls, as otherwise it could transform:

		   mov.w   r0,r0
		   beq     .L1
		   jsr     @_bar
		   .L1:   rts
		   _bar:  rts
		   into:
		   mov.w   r0,r0
		   bne     _bar
		   rts
		   _bar:  rts

		   which changes the call (jsr) into a branch (bne).  */
		if (code == 0x5a	/* jmp24.  */
		    && (int) gap <= 130
		    && (int) gap >= -128
		    && last_reloc
		    && ELF32_R_TYPE (last_reloc->r_info) == R_H8_PCREL8
		    && ELF32_R_SYM (last_reloc->r_info) < symtab_hdr->sh_info)
		  {
		    bfd_vma last_value;
		    asection *last_sym_sec;
		    Elf_Internal_Sym *last_sym;

		    /* We will need to examine the symbol used by the
		       previous relocation.  */

		    last_sym = isymbuf + ELF32_R_SYM (last_reloc->r_info);
		    last_sym_sec
		      = bfd_section_from_elf_index (abfd, last_sym->st_shndx);
		    last_value = (last_sym->st_value
				  + last_sym_sec->output_section->vma
				  + last_sym_sec->output_offset);

		    /* Verify that the previous relocation was for a
		       branch around this instruction and that no symbol
		       exists at the current location.  */
		    if (last_value == dot + 4
			&& last_reloc->r_offset + 2 == irel->r_offset
			&& ! elf32_h8_symbol_address_p (abfd, sec, dot))
		      {
			/* We can eliminate this jump.  Twiddle the
			   previous relocation as necessary.  */
			irel->r_info
			  = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
					  ELF32_R_TYPE (R_H8_NONE));

			last_reloc->r_info
			  = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
					  ELF32_R_TYPE (R_H8_PCREL8));
			last_reloc->r_addend = irel->r_addend;

			code = bfd_get_8 (abfd,
					  contents + last_reloc->r_offset - 1);
			code ^= 1;
			bfd_put_8 (abfd,
				   code,
				   contents + last_reloc->r_offset - 1);

			/* Delete four bytes of data.  */
			if (!elf32_h8_relax_delete_bytes (abfd, sec,
							  irel->r_offset - 1,
							  4))
			  goto error_return;

			*again = TRUE;
			break;
		      }
		  }

		if (code == 0x5e)
		  /* This is jsr24  */
		  bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 1);	/* bsr8. */
		else if (code == 0x5a)
		  /* This is jmp24  */
		  bfd_put_8 (abfd, 0x40, contents + irel->r_offset - 1);	/* bra8. */
		else
		  abort ();

		/* Fix the relocation's type.  */
		irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
					     R_H8_PCREL8);

		/* Delete two bytes of data.  */
		if (!elf32_h8_relax_delete_bytes (abfd, sec,
						  irel->r_offset + 1, 2))
		  goto error_return;

		/* That will change things, so, we should relax again.
		   Note that this is not required, and it may be slow.  */
		*again = TRUE;
	      }
	    break;
	  }

	  /* Try to turn a 16-bit pc-relative branch into a 8-bit pc-relative
	     branch.  */
	case R_H8_PCREL16:
	  {
	    bfd_vma value = symval + irel->r_addend;
	    bfd_vma dot;
	    bfd_vma gap;

	    /* Get the address of this instruction.  */
	    dot = (sec->output_section->vma
		   + sec->output_offset
		   + irel->r_offset - 2);

	    gap = value - dot;

	    /* If the distance is within -126..+130 inclusive, then we can
	       relax this jump.  +130 is valid since the target will move
	       two bytes closer if we do relax this branch.  */
	    if ((int) gap >= -126 && (int) gap <= 130)
	      {
		unsigned char code;

		/* Note that we've changed the relocs, section contents,
		   etc.  */
		elf_section_data (sec)->relocs = internal_relocs;
		elf_section_data (sec)->this_hdr.contents = contents;
		symtab_hdr->contents = (unsigned char *) isymbuf;

		/* Get the opcode.  */
		code = bfd_get_8 (abfd, contents + irel->r_offset - 2);

		if (code == 0x58)
		  {
		    /* bCC:16 -> bCC:8 */
		    /* Get the second byte of the original insn, which
		       contains the condition code.  */
		    code = bfd_get_8 (abfd, contents + irel->r_offset - 1);

		    /* Compute the first byte of the relaxed
		       instruction.  The original sequence 0x58 0xX0
		       is relaxed to 0x4X, where X represents the
		       condition code.  */
		    code &= 0xf0;
		    code >>= 4;
		    code |= 0x40;
		    bfd_put_8 (abfd, code, contents + irel->r_offset - 2); /* bCC:8.  */
		  }
		else if (code == 0x5c)	/* bsr16.  */
		  /* This is bsr.  */
		  bfd_put_8 (abfd, 0x55, contents + irel->r_offset - 2);  /* bsr8.  */
		else
		  /* Might be MOVSD.  */
		  break;

		/* Fix the relocation's type.  */
		irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
					     R_H8_PCREL8);
		irel->r_offset--;

		/* Delete two bytes of data.  */
		if (!elf32_h8_relax_delete_bytes (abfd, sec,
						  irel->r_offset + 1, 2))
		  goto error_return;

		/* That will change things, so, we should relax again.
		   Note that this is not required, and it may be slow.  */
		*again = TRUE;
	      }
	    break;
	  }

	  /* This is a 16-bit absolute address in one of the following
	     instructions:

	     "band", "bclr", "biand", "bild", "bior", "bist", "bixor",
	     "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and
	     "mov.b"

	     We may relax this into an 8-bit absolute address if it's in
	     the right range.  */
	case R_H8_DIR16A8:
	  {
	    bfd_vma value;

	    value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
	    if (value >= 0xffffff00u)
	      {
		unsigned char code;
		unsigned char temp_code;

		/* Note that we've changed the relocs, section contents,
		   etc.  */
		elf_section_data (sec)->relocs = internal_relocs;
		elf_section_data (sec)->this_hdr.contents = contents;
		symtab_hdr->contents = (unsigned char *) isymbuf;

		/* Get the opcode.  */
		code = bfd_get_8 (abfd, contents + irel->r_offset - 2);

		/* All instructions with R_H8_DIR16A8 start with
		   0x6a.  */
		if (code != 0x6a)
		  abort ();

		temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
		/* If this is a mov.b instruction, clear the lower
		   nibble, which contains the source/destination
		   register number.  */
		if ((temp_code & 0x10) != 0x10)
		  temp_code &= 0xf0;

		switch (temp_code)
		  {
		  case 0x00:
		    /* This is mov.b @aa:16,Rd.  */
		    bfd_put_8 (abfd, (code & 0xf) | 0x20,
			       contents + irel->r_offset - 2);
		    break;
		  case 0x80:
		    /* This is mov.b Rs,@aa:16.  */
		    bfd_put_8 (abfd, (code & 0xf) | 0x30,
			       contents + irel->r_offset - 2);
		    break;
		  case 0x18:
		    /* This is a bit-maniputation instruction that
		       stores one bit into memory, one of "bclr",
		       "bist", "bnot", "bset", and "bst".  */
		    bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
		    break;
		  case 0x10:
		    /* This is a bit-maniputation instruction that
		       loads one bit from memory, one of "band",
		       "biand", "bild", "bior", "bixor", "bld", "bor",
		       "btst", and "bxor".  */
		    bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
		    break;
		  default:
		    abort ();
		  }

		/* Fix the relocation's type.  */
		irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
					     R_H8_DIR8);

		/* Move the relocation.  */
		irel->r_offset--;

		/* Delete two bytes of data.  */
		if (!elf32_h8_relax_delete_bytes (abfd, sec,
						  irel->r_offset + 1, 2))
		  goto error_return;

		/* That will change things, so, we should relax again.
		   Note that this is not required, and it may be slow.  */
		*again = TRUE;
	      }
	    break;
	  }

	  /* This is a 24-bit absolute address in one of the following
	     instructions:

	     "band", "bclr", "biand", "bild", "bior", "bist", "bixor",
	     "bld", "bnot", "bor", "bset", "bst", "btst", "bxor", and
	     "mov.b"

	     We may relax this into an 8-bit absolute address if it's in
	     the right range.  */
	case R_H8_DIR24A8:
	  {
	    bfd_vma value;

	    value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
	    if (value >= 0xffffff00u)
	      {
		unsigned char code;
		unsigned char temp_code;

		/* Note that we've changed the relocs, section contents,
		   etc.  */
		elf_section_data (sec)->relocs = internal_relocs;
		elf_section_data (sec)->this_hdr.contents = contents;
		symtab_hdr->contents = (unsigned char *) isymbuf;

		/* Get the opcode.  */
		code = bfd_get_8 (abfd, contents + irel->r_offset - 2);

		/* All instructions with R_H8_DIR24A8 start with
		   0x6a.  */
		if (code != 0x6a)
		  abort ();

		temp_code = code = bfd_get_8 (abfd, contents + irel->r_offset - 1);

		/* If this is a mov.b instruction, clear the lower
		   nibble, which contains the source/destination
		   register number.  */
		if ((temp_code & 0x30) != 0x30)
		  temp_code &= 0xf0;

		switch (temp_code)
		  {
		  case 0x20:
		    /* This is mov.b @aa:24/32,Rd.  */
		    bfd_put_8 (abfd, (code & 0xf) | 0x20,
			       contents + irel->r_offset - 2);
		    break;
		  case 0xa0:
		    /* This is mov.b Rs,@aa:24/32.  */
		    bfd_put_8 (abfd, (code & 0xf) | 0x30,
			       contents + irel->r_offset - 2);
		    break;
		  case 0x38:
		    /* This is a bit-maniputation instruction that
		       stores one bit into memory, one of "bclr",
		       "bist", "bnot", "bset", and "bst".  */
		    bfd_put_8 (abfd, 0x7f, contents + irel->r_offset - 2);
		    break;
		  case 0x30:
		    /* This is a bit-maniputation instruction that
		       loads one bit from memory, one of "band",
		       "biand", "bild", "bior", "bixor", "bld", "bor",
		       "btst", and "bxor".  */
		    bfd_put_8 (abfd, 0x7e, contents + irel->r_offset - 2);
		    break;
		  default:
		    abort();
		  }

		/* Fix the relocation's type.  */
		irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
					     R_H8_DIR8);
		irel->r_offset--;

		/* Delete four bytes of data.  */
		if (!elf32_h8_relax_delete_bytes (abfd, sec,
						  irel->r_offset + 1, 4))
		  goto error_return;

		/* That will change things, so, we should relax again.
		   Note that this is not required, and it may be slow.  */
		*again = TRUE;
		break;
	      }
	  }

	  /* Fall through.  */

	  /* This is a 24-/32-bit absolute address in one of the
	     following instructions:

	     "band", "bclr", "biand", "bild", "bior", "bist",
	     "bixor", "bld", "bnot", "bor", "bset", "bst", "btst",
	     "bxor", "ldc.w", "stc.w" and "mov.[bwl]"

	     We may relax this into an 16-bit absolute address if it's
	     in the right range.  */
	case R_H8_DIR32A16:
	  {
	    bfd_vma value;

	    value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
	    if (value <= 0x7fff || value >= 0xffff8000u)
	      {
		unsigned char code;
		unsigned char op0, op1, op2, op3;
		unsigned char *op_ptr;

		/* Note that we've changed the relocs, section contents,
		   etc.  */
		elf_section_data (sec)->relocs = internal_relocs;
		elf_section_data (sec)->this_hdr.contents = contents;
		symtab_hdr->contents = (unsigned char *) isymbuf;

		if (irel->r_offset >= 4)
		  {
		    /* Check for 4-byte MOVA relaxation (SH-specific).  */
		    int second_reloc = 0;

		    op_ptr = contents + irel->r_offset - 4;

		    if (last_reloc)
		      {
			arelent bfd_reloc;
			reloc_howto_type *h;
			bfd_vma last_reloc_size;

			elf32_h8_info_to_howto (abfd, &bfd_reloc, last_reloc);
			h = bfd_reloc.howto;
			last_reloc_size = 1 << h->size;
			if (last_reloc->r_offset + last_reloc_size
			    == irel->r_offset)
			  {
			    op_ptr -= last_reloc_size;
			    second_reloc = 1;
			  }
		      }

		    if (irel + 1 < irelend)
		      {
			Elf_Internal_Rela *next_reloc = irel + 1;
			arelent bfd_reloc;
			reloc_howto_type *h;
			bfd_vma next_reloc_size;

			elf32_h8_info_to_howto (abfd, &bfd_reloc, next_reloc);
			h = bfd_reloc.howto;
			next_reloc_size = 1 << h->size;
			if (next_reloc->r_offset + next_reloc_size
			    == irel->r_offset)
			  {
			    op_ptr -= next_reloc_size;
			    second_reloc = 1;
			  }
		      }

		    op0 = bfd_get_8 (abfd, op_ptr + 0);
		    op1 = bfd_get_8 (abfd, op_ptr + 1);
		    op2 = bfd_get_8 (abfd, op_ptr + 2);
		    op3 = bfd_get_8 (abfd, op_ptr + 3);

		    if (op0 == 0x01
			&& (op1 & 0xdf) == 0x5f
			&& (op2 & 0x40) == 0x40
			&& (op3 & 0x80) == 0x80)
		      {
			if ((op2 & 0x08) == 0)
			  second_reloc = 1;

			if (second_reloc)
			  {
			    op3 &= ~0x08;
			    bfd_put_8 (abfd, op3, op_ptr + 3);
			  }
			else
			  {
			    op2 &= ~0x08;
			    bfd_put_8 (abfd, op2, op_ptr + 2);
			  }
			goto r_h8_dir32a16_common;
		      }
		  }

		/* Now check for short version of MOVA.  (SH-specific) */
		op_ptr = contents + irel->r_offset - 2;
		op0 = bfd_get_8 (abfd, op_ptr + 0);
		op1 = bfd_get_8 (abfd, op_ptr + 1);

		if (op0 == 0x7a
		    && (op1 & 0x88) == 0x80)
		  {
		    op1 |= 0x08;
		    bfd_put_8 (abfd, op1, op_ptr + 1);
		    goto r_h8_dir32a16_common;
		  }

		/* Get the opcode.  */
		code = bfd_get_8 (abfd, contents + irel->r_offset - 1);

		/* Fix the opcode.  For all the instructions that
		   belong to this relaxation, we simply need to turn
		   off bit 0x20 in the previous byte.  */
		code &= ~0x20;

		bfd_put_8 (abfd, code, contents + irel->r_offset - 1);

	      r_h8_dir32a16_common:
		/* Fix the relocation's type.  */
		irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
					     R_H8_DIR16);

		/* Delete two bytes of data.  */
		if (!elf32_h8_relax_delete_bytes (abfd, sec,
						  irel->r_offset + 1, 2))
		  goto error_return;

		/* That will change things, so, we should relax again.
		   Note that this is not required, and it may be slow.  */
		*again = TRUE;
	      }
	    break;	/* case R_H8_DIR32A16 */
	  }

	case R_H8_DISP32A16:
	  /* mov.[bwl] @(displ:24/32+ERx) -> mov.[bwl] @(displ:16+ERx)  4 bytes
	     It is assured that instruction uses at least 4 bytes opcode before
	     reloc entry addressing mode "register indirect with displacement"
	     relaxing options (all saving 4 bytes):
	     0x78 0sss0000 0x6A 0010dddd disp:32  mov.b @(d:32,ERs),Rd  ->
	     0x6E 0sssdddd disp:16  mov.b @(d:16,ERs),Rd
	     0x78 0sss0000 0x6B 0010dddd disp:32  mov.w @(d:32,ERs),Rd  ->
	     0x6F 0sssdddd disp:16  mov.w @(d:16,ERs),Rd
	     0x01 0x00 0x78 0sss0000 0x6B 00100ddd disp:32  mov.l @(d:32,ERs),ERd ->
	     0x01 0x00 0x6F 0sss0ddd disp:16  mov.l @(d:16,ERs),ERd

	     0x78 0ddd0000 0x6A 1010ssss disp:32  mov.b Rs,@(d:32,ERd)  ->
	     0x6E 1dddssss disp:16  mov.b Rs,@(d:16,ERd)
	     0x78 0ddd0000 0x6B 1010ssss disp:32  mov.w Rs,@(d:32,ERd)  ->
	     0x6F 1dddssss disp:16  mov.w Rs,@(d:16,ERd)
	     0x01 0x00 0x78 xddd0000 0x6B 10100sss disp:32  mov.l ERs,@(d:32,ERd) ->
	     0x01 0x00 0x6F 1ddd0sss disp:16  mov.l ERs,@(d:16,ERd)
	     mov.l prefix 0x01 0x00 can be left as is and mov.l handled same
	     as mov.w/  */
	  {
	    bfd_vma value;

	    value = bfd_h8300_pad_address (abfd, symval + irel->r_addend);
	    if (value <= 0x7fff || value >= 0xffff8000u)
	      {
		unsigned char op0, op1, op2, op3, op0n, op1n;
		int relax = 0;

		/* Note that we've changed the relocs, section contents,
		   etc.  */
		elf_section_data (sec)->relocs = internal_relocs;
		elf_section_data (sec)->this_hdr.contents = contents;
		symtab_hdr->contents = (unsigned char *) isymbuf;

		if (irel->r_offset >= 4)
		  {
		    op0 = bfd_get_8 (abfd, contents + irel->r_offset - 4);
		    op1 = bfd_get_8 (abfd, contents + irel->r_offset - 3);
		    op2 = bfd_get_8 (abfd, contents + irel->r_offset - 2);
		    op3 = bfd_get_8 (abfd, contents + irel->r_offset - 1);

		    if (op0 == 0x78)
		      {
			switch(op2)
			  {
			  case 0x6A:
			    if ((op1 & 0x8F) == 0x00 && (op3 & 0x70) == 0x20)
			      {
				/* mov.b.  */
				op0n = 0x6E;
				relax = 1;
			      }
			    break;
			  case 0x6B:
			    if ((op1 & 0x0F) == 0x00 && (op3 & 0x70) == 0x20)
			      {
				/* mov.w/l.  */
				op0n = 0x6F;
				relax = 1;
			      }
			    break;
			  default:
			    break;
			  }
		      }
		  }

		if (relax)
		  {
		    op1n = (op3 & 0x8F) | (op1 & 0x70);
		    bfd_put_8 (abfd, op0n, contents + irel->r_offset - 4);
		    bfd_put_8 (abfd, op1n, contents + irel->r_offset - 3);

		    /* Fix the relocation's type.  */
		    irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), R_H8_DIR16);
		    irel->r_offset -= 2;

		    /* Delete four bytes of data.  */
		    if (!elf32_h8_relax_delete_bytes (abfd, sec, irel->r_offset + 2, 4))
		      goto error_return;

		    /* That will change things, so, we should relax again.
		       Note that this is not required, and it may be slow.  */
		    *again = TRUE;
		  }
	      }
	  }
	  break;

	default:
	  break;
	}
    }

  if (isymbuf != NULL
      && symtab_hdr->contents != (unsigned char *) isymbuf)
    {
      if (! link_info->keep_memory)
	free (isymbuf);
      else
	symtab_hdr->contents = (unsigned char *) isymbuf;
    }

  if (contents != NULL
      && elf_section_data (sec)->this_hdr.contents != contents)
    {
      if (! link_info->keep_memory)
	free (contents);
      else
	{
	  /* Cache the section contents for elf_link_input_bfd.  */
	  elf_section_data (sec)->this_hdr.contents = contents;
	}
    }

  if (internal_relocs != NULL
      && elf_section_data (sec)->relocs != internal_relocs)
    free (internal_relocs);

  return TRUE;

 error_return:
  if (isymbuf != NULL
      && symtab_hdr->contents != (unsigned char *) isymbuf)
    free (isymbuf);
  if (contents != NULL
      && elf_section_data (sec)->this_hdr.contents != contents)
    free (contents);
  if (internal_relocs != NULL
      && elf_section_data (sec)->relocs != internal_relocs)
    free (internal_relocs);
  return FALSE;
}

/* Delete some bytes from a section while relaxing.  */

static bfd_boolean
elf32_h8_relax_delete_bytes (bfd *abfd, asection *sec, bfd_vma addr, int count)
{
  Elf_Internal_Shdr *symtab_hdr;
  unsigned int sec_shndx;
  bfd_byte *contents;
  Elf_Internal_Rela *irel, *irelend;
  Elf_Internal_Sym *isym;
  Elf_Internal_Sym *isymend;
  bfd_vma toaddr;
  struct elf_link_hash_entry **sym_hashes;
  struct elf_link_hash_entry **end_hashes;
  unsigned int symcount;

  sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);

  contents = elf_section_data (sec)->this_hdr.contents;

  toaddr = sec->size;

  irel = elf_section_data (sec)->relocs;
  irelend = irel + sec->reloc_count;

  /* Actually delete the bytes.  */
  memmove (contents + addr, contents + addr + count,
	   (size_t) (toaddr - addr - count));
  sec->size -= count;

  /* Adjust all the relocs.  */
  for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
    {
      /* Get the new reloc address.  */
      if ((irel->r_offset > addr
	   && irel->r_offset <= toaddr))
	irel->r_offset -= count;
    }

  /* Adjust the local symbols defined in this section.  */
  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
  isym = (Elf_Internal_Sym *) symtab_hdr->contents;
  isymend = isym + symtab_hdr->sh_info;
  for (; isym < isymend; isym++)
    {
      if (isym->st_shndx == sec_shndx
	  && isym->st_value > addr
	  && isym->st_value <= toaddr)
	isym->st_value -= count;
    }

  /* Now adjust the global symbols defined in this section.  */
  symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
	      - symtab_hdr->sh_info);
  sym_hashes = elf_sym_hashes (abfd);
  end_hashes = sym_hashes + symcount;
  for (; sym_hashes < end_hashes; sym_hashes++)
    {
      struct elf_link_hash_entry *sym_hash = *sym_hashes;

      if ((sym_hash->root.type == bfd_link_hash_defined
	   || sym_hash->root.type == bfd_link_hash_defweak)
	  && sym_hash->root.u.def.section == sec
	  && sym_hash->root.u.def.value > addr
	  && sym_hash->root.u.def.value <= toaddr)
	sym_hash->root.u.def.value -= count;
    }

  return TRUE;
}

/* Return TRUE if a symbol exists at the given address, else return
   FALSE.  */
static bfd_boolean
elf32_h8_symbol_address_p (bfd *abfd, asection *sec, bfd_vma addr)
{
  Elf_Internal_Shdr *symtab_hdr;
  unsigned int sec_shndx;
  Elf_Internal_Sym *isym;
  Elf_Internal_Sym *isymend;
  struct elf_link_hash_entry **sym_hashes;
  struct elf_link_hash_entry **end_hashes;
  unsigned int symcount;

  sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);

  /* Examine all the symbols.  */
  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
  isym = (Elf_Internal_Sym *) symtab_hdr->contents;
  isymend = isym + symtab_hdr->sh_info;
  for (; isym < isymend; isym++)
    {
      if (isym->st_shndx == sec_shndx
	  && isym->st_value == addr)
	return TRUE;
    }

  symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym)
	      - symtab_hdr->sh_info);
  sym_hashes = elf_sym_hashes (abfd);
  end_hashes = sym_hashes + symcount;
  for (; sym_hashes < end_hashes; sym_hashes++)
    {
      struct elf_link_hash_entry *sym_hash = *sym_hashes;
      if ((sym_hash->root.type == bfd_link_hash_defined
	   || sym_hash->root.type == bfd_link_hash_defweak)
	  && sym_hash->root.u.def.section == sec
	  && sym_hash->root.u.def.value == addr)
	return TRUE;
    }

  return FALSE;
}

/* This is a version of bfd_generic_get_relocated_section_contents
   which uses elf32_h8_relocate_section.  */

static bfd_byte *
elf32_h8_get_relocated_section_contents (bfd *output_bfd,
					 struct bfd_link_info *link_info,
					 struct bfd_link_order *link_order,
					 bfd_byte *data,
					 bfd_boolean relocatable,
					 asymbol **symbols)
{
  Elf_Internal_Shdr *symtab_hdr;
  asection *input_section = link_order->u.indirect.section;
  bfd *input_bfd = input_section->owner;
  asection **sections = NULL;
  Elf_Internal_Rela *internal_relocs = NULL;
  Elf_Internal_Sym *isymbuf = NULL;

  /* We only need to handle the case of relaxing, or of having a
     particular set of section contents, specially.  */
  if (relocatable
      || elf_section_data (input_section)->this_hdr.contents == NULL)
    return bfd_generic_get_relocated_section_contents (output_bfd, link_info,
						       link_order, data,
						       relocatable,
						       symbols);

  symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;

  memcpy (data, elf_section_data (input_section)->this_hdr.contents,
	  (size_t) input_section->size);

  if ((input_section->flags & SEC_RELOC) != 0
      && input_section->reloc_count > 0)
    {
      asection **secpp;
      Elf_Internal_Sym *isym, *isymend;
      bfd_size_type amt;

      internal_relocs = (_bfd_elf_link_read_relocs
			 (input_bfd, input_section, NULL,
			  (Elf_Internal_Rela *) NULL, FALSE));
      if (internal_relocs == NULL)
	goto error_return;

      if (symtab_hdr->sh_info != 0)
	{
	  isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
	  if (isymbuf == NULL)
	    isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr,
					    symtab_hdr->sh_info, 0,
					    NULL, NULL, NULL);
	  if (isymbuf == NULL)
	    goto error_return;
	}

      amt = symtab_hdr->sh_info;
      amt *= sizeof (asection *);
      sections = (asection **) bfd_malloc (amt);
      if (sections == NULL && amt != 0)
	goto error_return;

      isymend = isymbuf + symtab_hdr->sh_info;
      for (isym = isymbuf, secpp = sections; isym < isymend; ++isym, ++secpp)
	{
	  asection *isec;

	  if (isym->st_shndx == SHN_UNDEF)
	    isec = bfd_und_section_ptr;
	  else if (isym->st_shndx == SHN_ABS)
	    isec = bfd_abs_section_ptr;
	  else if (isym->st_shndx == SHN_COMMON)
	    isec = bfd_com_section_ptr;
	  else
	    isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);

	  *secpp = isec;
	}

      if (! elf32_h8_relocate_section (output_bfd, link_info, input_bfd,
				       input_section, data, internal_relocs,
				       isymbuf, sections))
	goto error_return;

      if (sections != NULL)
	free (sections);
      if (isymbuf != NULL
	  && symtab_hdr->contents != (unsigned char *) isymbuf)
	free (isymbuf);
      if (elf_section_data (input_section)->relocs != internal_relocs)
	free (internal_relocs);
    }

  return data;

 error_return:
  if (sections != NULL)
    free (sections);
  if (isymbuf != NULL
      && symtab_hdr->contents != (unsigned char *) isymbuf)
    free (isymbuf);
  if (internal_relocs != NULL
      && elf_section_data (input_section)->relocs != internal_relocs)
    free (internal_relocs);
  return NULL;
}


#define TARGET_BIG_SYM			h8300_elf32_vec
#define TARGET_BIG_NAME			"elf32-h8300"
#define ELF_ARCH			bfd_arch_h8300
#define ELF_MACHINE_CODE		EM_H8_300
#define ELF_MAXPAGESIZE			0x1
#define bfd_elf32_bfd_reloc_type_lookup elf32_h8_reloc_type_lookup
#define bfd_elf32_bfd_reloc_name_lookup elf32_h8_reloc_name_lookup
#define elf_info_to_howto		elf32_h8_info_to_howto
#define elf_info_to_howto_rel		elf32_h8_info_to_howto_rel

/* So we can set/examine bits in e_flags to get the specific
   H8 architecture in use.  */
#define elf_backend_final_write_processing \
  elf32_h8_final_write_processing
#define elf_backend_object_p \
  elf32_h8_object_p
#define bfd_elf32_bfd_merge_private_bfd_data \
  elf32_h8_merge_private_bfd_data

/* ??? when elf_backend_relocate_section is not defined, elf32-target.h
   defaults to using _bfd_generic_link_hash_table_create, but
   bfd_elf_size_dynamic_sections uses
   dynobj = elf_hash_table (info)->dynobj;
   and thus requires an elf hash table.  */
#define bfd_elf32_bfd_link_hash_table_create _bfd_elf_link_hash_table_create

/* Use an H8 specific linker, not the ELF generic linker.  */
#define elf_backend_relocate_section elf32_h8_relocate_section
#define elf_backend_rela_normal		1
#define elf_backend_can_gc_sections	1

/* And relaxing stuff.  */
#define bfd_elf32_bfd_relax_section     elf32_h8_relax_section
#define bfd_elf32_bfd_get_relocated_section_contents \
                                elf32_h8_get_relocated_section_contents

#define elf_symbol_leading_char '_'

#include "elf32-target.h"
