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[deliverable/binutils-gdb.git] / bfd / elf32-mcore.c

/* Motorola MCore specific support for 32-bit ELF
   Copyright 1994, 1995, 1999, 2000, 2001 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 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.  */

/* This file is based on a preliminary RCE ELF ABI.  The
   information may not match the final RCE ELF ABI.   */

#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/mcore.h"
#include <assert.h>

#define USE_RELA        /* Only USE_REL is actually significant, but this is
                           here are a reminder...  */

static void mcore_elf_howto_init
  PARAMS ((void));
static reloc_howto_type * mcore_elf_reloc_type_lookup
  PARAMS ((bfd *, bfd_reloc_code_real_type));
static void mcore_elf_info_to_howto
  PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
static boolean mcore_elf_set_private_flags
  PARAMS ((bfd *, flagword));
static boolean mcore_elf_copy_private_bfd_data
  PARAMS ((bfd *, bfd *));
static boolean mcore_elf_merge_private_bfd_data
  PARAMS ((bfd *, bfd *));
static bfd_reloc_status_type mcore_elf_unsupported_reloc
  PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
static boolean mcore_elf_relocate_section
  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
           Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));

static reloc_howto_type * mcore_elf_howto_table [(int) R_MCORE_max];

static reloc_howto_type mcore_elf_howto_raw[] =
{
  /* This reloc does nothing.  */
  HOWTO (R_MCORE_NONE,          /* type */
         0,                     /* rightshift */
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
         32,                    /* bitsize */
         false,                 /* pc_relative */
         0,                     /* bitpos */
         complain_overflow_bitfield,  /* complain_on_overflow */
         NULL,                  /* special_function */
         "R_MCORE_NONE",        /* name */
         false,                 /* partial_inplace */
         0,                     /* src_mask */
         0,                     /* dst_mask */
         false),                /* pcrel_offset */

  /* A standard 32 bit relocation.  */
  HOWTO (R_MCORE_ADDR32,        /* type */
         0,                     /* rightshift */
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
         32,                    /* bitsize */
         false,                 /* pc_relative */
         0,                     /* bitpos */
         complain_overflow_bitfield, /* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "ADDR32",              /* name *//* For compatability with coff/pe port.  */
         false,                 /* partial_inplace */
         0x0,                   /* src_mask */
         0xffffffff,            /* dst_mask */
         false),                /* pcrel_offset */

  /* 8 bits + 2 zero bits; jmpi/jsri/lrw instructions.
     Should not appear in object files.  */
  HOWTO (R_MCORE_PCRELIMM8BY4,  /* type */
         2,                     /* rightshift */
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
         8,                     /* bitsize */
         true,                  /* pc_relative */
         0,                     /* bitpos */
         complain_overflow_bitfield, /* complain_on_overflow */
         mcore_elf_unsupported_reloc,   /* special_function */
         "R_MCORE_PCRELIMM8BY4",/* name */
         false,                 /* partial_inplace */
         0,                     /* src_mask */
         0,                     /* dst_mask */
         true),                 /* pcrel_offset */

  /* bsr/bt/bf/br instructions; 11 bits + 1 zero bit
     Span 2k instructions == 4k bytes.
     Only useful pieces at the relocated address are the opcode (5 bits) */
  HOWTO (R_MCORE_PCRELIMM11BY2,/* type */
         1,                     /* rightshift */
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
         11,                    /* bitsize */
         true,                  /* pc_relative */
         0,                     /* bitpos */
         complain_overflow_signed, /* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "R_MCORE_PCRELIMM11BY2",/* name */
         false,                 /* partial_inplace */
         0x0,                   /* src_mask */
         0x7ff,                 /* dst_mask */
         true),                 /* pcrel_offset */

  /* 4 bits + 1 zero bit; 'loopt' instruction only; unsupported.  */
  HOWTO (R_MCORE_PCRELIMM4BY2,  /* type */
         1,                     /* rightshift */
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
         4,                     /* bitsize */
         true,                  /* pc_relative */
         0,                     /* bitpos */
         complain_overflow_bitfield, /* complain_on_overflow */
         mcore_elf_unsupported_reloc,/* special_function */
         "R_MCORE_PCRELIMM4BY2",/* name */
         false,                 /* partial_inplace */
         0,                     /* src_mask */
         0,                     /* dst_mask */
         true),                 /* pcrel_offset */

  /* 32-bit pc-relative. Eventually this will help support PIC code.  */
  HOWTO (R_MCORE_PCREL32,       /* type */
         0,                     /* rightshift */
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
         32,                    /* bitsize */
         true,                  /* pc_relative */
         0,                     /* bitpos */
         complain_overflow_bitfield, /* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "R_MCORE_PCREL32",     /* name */
         false,                 /* partial_inplace */
         0x0,                   /* src_mask */
         0xffffffff,            /* dst_mask */
         true),                 /* pcrel_offset */

  /* Like PCRELIMM11BY2, this relocation indicates that there is a
     'jsri' at the specified address. There is a separate relocation
     entry for the literal pool entry that it references, but we
     might be able to change the jsri to a bsr if the target turns out
     to be close enough [even though we won't reclaim the literal pool
     entry, we'll get some runtime efficiency back]. Note that this
     is a relocation that we are allowed to safely ignore.  */
  HOWTO (R_MCORE_PCRELJSR_IMM11BY2,/* type */
         1,                     /* rightshift */
         1,                     /* size (0 = byte, 1 = short, 2 = long) */
         11,                    /* bitsize */
         true,                  /* pc_relative */
         0,                     /* bitpos */
         complain_overflow_signed, /* complain_on_overflow */
         bfd_elf_generic_reloc, /* special_function */
         "R_MCORE_PCRELJSR_IMM11BY2", /* name */
         false,                 /* partial_inplace */
         0x0,                   /* src_mask */
         0x7ff,                 /* dst_mask */
         true),                 /* pcrel_offset */

  /* GNU extension to record C++ vtable hierarchy */
  HOWTO (R_MCORE_GNU_VTINHERIT, /* type */
         0,                     /* rightshift */
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
         0,                     /* bitsize */
         false,                 /* pc_relative */
         0,                     /* bitpos */
         complain_overflow_dont, /* complain_on_overflow */
         NULL,                  /* special_function */
         "R_MCORE_GNU_VTINHERIT", /* name */
         false,                 /* partial_inplace */
         0,                     /* src_mask */
         0,                     /* dst_mask */
         false),                /* pcrel_offset */

  /* GNU extension to record C++ vtable member usage */
  HOWTO (R_MCORE_GNU_VTENTRY,   /* type */
         0,                     /* rightshift */
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
         0,                     /* bitsize */
         false,                 /* pc_relative */
         0,                     /* bitpos */
         complain_overflow_dont,/* complain_on_overflow */
         _bfd_elf_rel_vtable_reloc_fn,  /* special_function */
         "R_MCORE_GNU_VTENTRY", /* name */
         false,                 /* partial_inplace */
         0,                     /* src_mask */
         0,                     /* dst_mask */
         false),                /* pcrel_offset */

  HOWTO (R_MCORE_RELATIVE,      /* type */
         0,                     /* rightshift */
         2,                     /* size (0 = byte, 1 = short, 2 = long) */
         32,                    /* bitsize */
         false,                 /* pc_relative */
         0,                     /* bitpos */
         complain_overflow_signed, /* complain_on_overflow */
         NULL,                  /* special_function */
         "R_MCORE_RELATIVE",    /* name */
         true,                  /* partial_inplace */
         0xffffffff,            /* src_mask */
         0xffffffff,            /* dst_mask */
         false)                 /* pcrel_offset */
};

#ifndef NUM_ELEM
#define NUM_ELEM(a) (sizeof (a) / sizeof (a)[0])
#endif
\f
/* Initialize the mcore_elf_howto_table, so that linear accesses can be done.  */
static void
mcore_elf_howto_init ()
{
  unsigned int i;

  for (i = NUM_ELEM (mcore_elf_howto_raw); i--;)
    {
      unsigned int type;

      type = mcore_elf_howto_raw[i].type;

      BFD_ASSERT (type < NUM_ELEM (mcore_elf_howto_table));

      mcore_elf_howto_table [type] = & mcore_elf_howto_raw [i];
    }
}
\f
static reloc_howto_type *
mcore_elf_reloc_type_lookup (abfd, code)
     bfd * abfd ATTRIBUTE_UNUSED;
     bfd_reloc_code_real_type code;
{
  enum elf_mcore_reloc_type mcore_reloc = R_MCORE_NONE;

  switch (code)
    {
    case BFD_RELOC_NONE:                     mcore_reloc = R_MCORE_NONE; break;
    case BFD_RELOC_32:                       mcore_reloc = R_MCORE_ADDR32; break;
    case BFD_RELOC_MCORE_PCREL_IMM8BY4:      mcore_reloc = R_MCORE_PCRELIMM8BY4; break;
    case BFD_RELOC_MCORE_PCREL_IMM11BY2:     mcore_reloc = R_MCORE_PCRELIMM11BY2; break;
    case BFD_RELOC_MCORE_PCREL_IMM4BY2:      mcore_reloc = R_MCORE_PCRELIMM4BY2; break;
    case BFD_RELOC_32_PCREL:                 mcore_reloc = R_MCORE_PCREL32; break;
    case BFD_RELOC_MCORE_PCREL_JSR_IMM11BY2: mcore_reloc = R_MCORE_PCRELJSR_IMM11BY2; break;
    case BFD_RELOC_VTABLE_INHERIT:           mcore_reloc = R_MCORE_GNU_VTINHERIT; break;
    case BFD_RELOC_VTABLE_ENTRY:             mcore_reloc = R_MCORE_GNU_VTENTRY; break;
    case BFD_RELOC_RVA:                      mcore_reloc = R_MCORE_RELATIVE; break;
    default:
      return (reloc_howto_type *)NULL;
    }

  if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])   /* Initialize howto table if needed */
    mcore_elf_howto_init ();

  return mcore_elf_howto_table [(int) mcore_reloc];
};

/* Set the howto pointer for a RCE ELF reloc.  */
static void
mcore_elf_info_to_howto (abfd, cache_ptr, dst)
     bfd * abfd ATTRIBUTE_UNUSED;
     arelent * cache_ptr;
     Elf32_Internal_Rela * dst;
{
  if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])   /* Initialize howto table if needed */
    mcore_elf_howto_init ();

  BFD_ASSERT (ELF32_R_TYPE (dst->r_info) < (unsigned int) R_MCORE_max);

  cache_ptr->howto = mcore_elf_howto_table [ELF32_R_TYPE (dst->r_info)];
}

/* Function to set whether a module needs the -mrelocatable bit set.  */
static boolean
mcore_elf_set_private_flags (abfd, flags)
     bfd * abfd;
     flagword flags;
{
  BFD_ASSERT (! elf_flags_init (abfd)
              || elf_elfheader (abfd)->e_flags == flags);

  elf_elfheader (abfd)->e_flags = flags;
  elf_flags_init (abfd) = true;
  return true;
}

/* Copy backend specific data from one object module to another.  */
static boolean
mcore_elf_copy_private_bfd_data (ibfd, obfd)
     bfd * ibfd;
     bfd * obfd;
{
  if (   bfd_get_flavour (ibfd) != bfd_target_elf_flavour
      || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
    return true;

  BFD_ASSERT (! elf_flags_init (obfd)
              || elf_elfheader (obfd)->e_flags == elf_elfheader (ibfd)->e_flags);

  elf_elfheader (obfd)->e_flags = elf_elfheader (ibfd)->e_flags;
  elf_flags_init (obfd) = true;
  return true;
}

/* Merge backend specific data from an object file to the output
   object file when linking.  */
static boolean
mcore_elf_merge_private_bfd_data (ibfd, obfd)
     bfd * ibfd;
     bfd * obfd;
{
  flagword old_flags;
  flagword new_flags;

  /* Check if we have the same endianess */
  if (_bfd_generic_verify_endian_match (ibfd, obfd) == false)
    return false;

  if (   bfd_get_flavour (ibfd) != bfd_target_elf_flavour
      || bfd_get_flavour (obfd) != bfd_target_elf_flavour)
    return true;

  new_flags = elf_elfheader (ibfd)->e_flags;
  old_flags = elf_elfheader (obfd)->e_flags;

  if (! elf_flags_init (obfd))  /* First call, no flags set */
    {
      elf_flags_init (obfd) = true;
      elf_elfheader (obfd)->e_flags = new_flags;
    }
  else if (new_flags == old_flags)      /* Compatible flags are ok */
    ;
  else
    {
      /* FIXME */
    }

  return true;
}
\f
/* Don't pretend we can deal with unsupported relocs.  */

static bfd_reloc_status_type
mcore_elf_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section,
                           output_bfd, error_message)
     bfd * abfd;
     arelent * reloc_entry;
     asymbol * symbol ATTRIBUTE_UNUSED;
     PTR data ATTRIBUTE_UNUSED;
     asection * input_section ATTRIBUTE_UNUSED;
     bfd * output_bfd ATTRIBUTE_UNUSED;
     char ** error_message ATTRIBUTE_UNUSED;
{
  BFD_ASSERT (reloc_entry->howto != (reloc_howto_type *)0);

  _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"),
                      bfd_get_filename (abfd),
                      reloc_entry->howto->name,
                      reloc_entry->howto->type);

  return bfd_reloc_notsupported;
}
\f
/* The RELOCATE_SECTION function is called by the ELF backend linker
   to handle the relocations for a section.

   The relocs are always passed as Rela structures; if the section
   actually uses Rel structures, the r_addend field will always be
   zero.

   This function is responsible for adjust the section contents as
   necessary, and (if using Rela relocs and generating a
   relocateable output file) adjusting the reloc addend as
   necessary.

   This function does not have to worry about setting the reloc
   address or the reloc symbol index.

   LOCAL_SYMS is a pointer to the swapped in local symbols.

   LOCAL_SECTIONS is an array giving the section in the input file
   corresponding to the st_shndx field of each local symbol.

   The global hash table entry for the global symbols can be found
   via elf_sym_hashes (input_bfd).

   When generating relocateable output, this function must handle
   STB_LOCAL/STT_SECTION symbols specially.  The output symbol is
   going to be the section symbol corresponding to the output
   section, which means that the addend must be adjusted
   accordingly.  */

static boolean
mcore_elf_relocate_section (output_bfd, info, input_bfd, input_section,
                          contents, relocs, local_syms, local_sections)
     bfd * output_bfd ATTRIBUTE_UNUSED;
     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 = & elf_tdata (input_bfd)->symtab_hdr;
  struct elf_link_hash_entry ** sym_hashes = elf_sym_hashes (input_bfd);
  Elf_Internal_Rela *           rel = relocs;
  Elf_Internal_Rela *           relend = relocs + input_section->reloc_count;
  boolean ret = true;

#ifdef DEBUG
  fprintf (stderr,
           "mcore_elf_relocate_section called for %s section %s, %ld relocations%s\n",
           bfd_get_filename (input_bfd),
           bfd_section_name(input_bfd, input_section),
           (long) input_section->reloc_count,
           (info->relocateable) ? " (relocatable)" : "");
#endif

  if (! mcore_elf_howto_table [R_MCORE_PCRELIMM8BY4])   /* Initialize howto table if needed */
    mcore_elf_howto_init ();

  for (; rel < relend; rel++)
    {
      enum elf_mcore_reloc_type    r_type = (enum elf_mcore_reloc_type) ELF32_R_TYPE (rel->r_info);
      bfd_vma                      offset = rel->r_offset;
      bfd_vma                      addend = rel->r_addend;
      bfd_reloc_status_type        r = bfd_reloc_other;
      asection *                   sec = (asection *) 0;
      reloc_howto_type *           howto;
      bfd_vma                      relocation;
      Elf_Internal_Sym *           sym = (Elf_Internal_Sym *) 0;
      unsigned long                r_symndx;
      struct elf_link_hash_entry * h = (struct elf_link_hash_entry *) 0;
      unsigned short               oldinst = 0;

      /* Unknown relocation handling */
      if ((unsigned) r_type >= (unsigned) R_MCORE_max
          || ! mcore_elf_howto_table [(int)r_type])
        {
          _bfd_error_handler (_("%s: Unknown relocation type %d\n"),
                              bfd_get_filename (input_bfd),
                              (int) r_type);

          bfd_set_error (bfd_error_bad_value);
          ret = false;
          continue;
        }

      howto = mcore_elf_howto_table [(int) r_type];
      r_symndx = ELF32_R_SYM (rel->r_info);

      if (info->relocateable)
        {
          /* This is a relocateable link.  We don't have to change
             anything, unless the reloc is against a section symbol,
             in which case we have to adjust according to where the
             section symbol winds up in the output section.  */
          if (r_symndx < symtab_hdr->sh_info)
            {
              sym = local_syms + r_symndx;

              if ((unsigned)ELF_ST_TYPE (sym->st_info) == STT_SECTION)
                {
                  sec = local_sections[r_symndx];
                  addend = rel->r_addend += sec->output_offset + sym->st_value;
                }
            }

#ifdef DEBUG
          fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
                   howto->name, (int) r_type, r_symndx, (long) offset, (long) addend);
#endif
          continue;
        }

      /* This is a final link.  */

      /* Complain about known relocation that are not yet supported.  */
      if (howto->special_function == mcore_elf_unsupported_reloc)
        {
          _bfd_error_handler (_("%s: Relocation %s (%d) is not currently supported.\n"),
                              bfd_get_filename (input_bfd),
                              howto->name,
                              (int)r_type);

          bfd_set_error (bfd_error_bad_value);
          ret = false;
          continue;
        }

      if (r_symndx < symtab_hdr->sh_info)
        {
          sym = local_syms + r_symndx;
          sec = local_sections [r_symndx];
          relocation = (sec->output_section->vma
                        + sec->output_offset
                        + sym->st_value);
        }
      else
        {
          h = sym_hashes [r_symndx - symtab_hdr->sh_info];
          if (   h->root.type == bfd_link_hash_defined
              || h->root.type == bfd_link_hash_defweak)
            {
              sec = h->root.u.def.section;
              relocation = (h->root.u.def.value
                            + sec->output_section->vma
                            + sec->output_offset);
            }
          else if (h->root.type == bfd_link_hash_undefweak)
            relocation = 0;
          else if (info->shared
                   && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
            relocation = 0;
          else
            {
              if (! ((*info->callbacks->undefined_symbol)
                        (info, h->root.root.string, input_bfd,
                         input_section, rel->r_offset, true)))
                return false;

              ret = false;
              continue;
            }
        }

      switch (r_type)
        {
        default:
          break;

        case R_MCORE_PCRELJSR_IMM11BY2:
          oldinst = bfd_get_16 (input_bfd, contents + offset);
#define MCORE_INST_BSR  0xF800
          bfd_put_16 (input_bfd, MCORE_INST_BSR, contents + offset);
          break;
        }

#ifdef DEBUG
      fprintf (stderr, "\ttype = %s (%d), symbol index = %ld, offset = %ld, addend = %ld\n",
               howto->name, r_type, r_symndx, (long) offset, (long) addend);
#endif

      r = _bfd_final_link_relocate
        (howto, input_bfd, input_section, contents, offset, relocation, addend);

      if (r != bfd_reloc_ok && r_type == R_MCORE_PCRELJSR_IMM11BY2)
        {
          /* Wasn't ok, back it out and give up.  */
          bfd_put_16 (input_bfd, oldinst, contents + offset);
          r = bfd_reloc_ok;
        }

      if (r != bfd_reloc_ok)
        {
          ret = false;

          switch (r)
            {
            default:
              break;

            case bfd_reloc_overflow:
              {
                const char * name;

                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)
                      break;

                    if (* name == '\0')
                      name = bfd_section_name (input_bfd, sec);
                  }

                (*info->callbacks->reloc_overflow)
                  (info, name, howto->name, (bfd_vma) 0, input_bfd, input_section,
                   offset);
              }
              break;
            }
        }
    }

#ifdef DEBUG
  fprintf (stderr, "\n");
#endif

  return ret;
}
\f
/* Return the section that should be marked against GC for a given
   relocation.  */

static asection *
mcore_elf_gc_mark_hook (abfd, info, rel, h, sym)
     bfd *                        abfd;
     struct bfd_link_info *       info ATTRIBUTE_UNUSED;
     Elf_Internal_Rela *          rel;
     struct elf_link_hash_entry * h;
     Elf_Internal_Sym *           sym;
{
  if (h != NULL)
    {
      switch (ELF32_R_TYPE (rel->r_info))
        {
        case R_MCORE_GNU_VTINHERIT:
        case R_MCORE_GNU_VTENTRY:
          break;

        default:
          switch (h->root.type)
            {
            case bfd_link_hash_defined:
            case bfd_link_hash_defweak:
              return h->root.u.def.section;

            case bfd_link_hash_common:
              return h->root.u.c.p->section;

            default:
              break;
            }
        }
    }
  else
    {
      if (!(elf_bad_symtab (abfd)
            && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
          && ! ((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
                && sym->st_shndx != SHN_COMMON))
        {
          return bfd_section_from_elf_index (abfd, sym->st_shndx);
        }
    }

  return NULL;
}

/* Update the got entry reference counts for the section being removed.  */

static boolean
mcore_elf_gc_sweep_hook (abfd, info, sec, relocs)
     bfd *                     abfd ATTRIBUTE_UNUSED;
     struct bfd_link_info *    info ATTRIBUTE_UNUSED;
     asection *                sec ATTRIBUTE_UNUSED;
     const Elf_Internal_Rela * relocs ATTRIBUTE_UNUSED;
{
  return true;
}

/* Look through the relocs for a section during the first phase.
   Since we don't do .gots or .plts, we just need to consider the
   virtual table relocs for gc.  */

static boolean
mcore_elf_check_relocs (abfd, info, sec, relocs)
     bfd * abfd;
     struct bfd_link_info * info;
     asection * sec;
     const Elf_Internal_Rela * relocs;
{
  Elf_Internal_Shdr *           symtab_hdr;
  struct elf_link_hash_entry ** sym_hashes;
  struct elf_link_hash_entry ** sym_hashes_end;
  const Elf_Internal_Rela *     rel;
  const Elf_Internal_Rela *     rel_end;

  if (info->relocateable)
    return true;

  symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (abfd);
  sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
  if (!elf_bad_symtab (abfd))
    sym_hashes_end -= symtab_hdr->sh_info;

  rel_end = relocs + sec->reloc_count;

  for (rel = relocs; rel < rel_end; rel++)
    {
      struct elf_link_hash_entry * h;
      unsigned long r_symndx;

      r_symndx = ELF32_R_SYM (rel->r_info);

      if (r_symndx < symtab_hdr->sh_info)
        h = NULL;
      else
        h = sym_hashes [r_symndx - symtab_hdr->sh_info];

      switch (ELF32_R_TYPE (rel->r_info))
        {
        /* This relocation describes the C++ object vtable hierarchy.
           Reconstruct it for later use during GC.  */
        case R_MCORE_GNU_VTINHERIT:
          if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
            return false;
          break;

        /* This relocation describes which C++ vtable entries are actually
           used.  Record for later use during GC.  */
        case R_MCORE_GNU_VTENTRY:
          if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
            return false;
          break;
        }
    }

  return true;
}

#define TARGET_BIG_SYM          bfd_elf32_mcore_big_vec
#define TARGET_BIG_NAME         "elf32-mcore-big"
#define TARGET_LITTLE_SYM       bfd_elf32_mcore_little_vec
#define TARGET_LITTLE_NAME      "elf32-mcore-little"

#define ELF_ARCH                bfd_arch_mcore
#define ELF_MACHINE_CODE        EM_MCORE
#define ELF_MAXPAGESIZE         0x1000          /* 4k, if we ever have 'em */
#define elf_info_to_howto       mcore_elf_info_to_howto
#define elf_info_to_howto_rel   NULL

#define bfd_elf32_bfd_copy_private_bfd_data     mcore_elf_copy_private_bfd_data
#define bfd_elf32_bfd_merge_private_bfd_data    mcore_elf_merge_private_bfd_data
#define bfd_elf32_bfd_set_private_flags         mcore_elf_set_private_flags
#define bfd_elf32_bfd_reloc_type_lookup         mcore_elf_reloc_type_lookup
#define elf_backend_relocate_section            mcore_elf_relocate_section
#define elf_backend_gc_mark_hook                mcore_elf_gc_mark_hook
#define elf_backend_gc_sweep_hook               mcore_elf_gc_sweep_hook
#define elf_backend_check_relocs                mcore_elf_check_relocs

#define elf_backend_can_gc_sections             1

#include "elf32-target.h"