[external/binutils.git] / bfd / elf32-m68k.c

/* Motorola 68k series support for 32-bit ELF
   Copyright 1993, 1995, 1996, 1997 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.  */

#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"

static reloc_howto_type *reloc_type_lookup
  PARAMS ((bfd *, bfd_reloc_code_real_type));
static void rtype_to_howto
  PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
static void rtype_to_howto_rel
  PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
static struct bfd_hash_entry *elf_m68k_link_hash_newfunc
  PARAMS ((struct bfd_hash_entry *, struct bfd_hash_table *, const char *));
static struct bfd_link_hash_table *elf_m68k_link_hash_table_create
  PARAMS ((bfd *));
static boolean elf_m68k_check_relocs
  PARAMS ((bfd *, struct bfd_link_info *, asection *,
           const Elf_Internal_Rela *));
static boolean elf_m68k_adjust_dynamic_symbol
  PARAMS ((struct bfd_link_info *, struct elf_link_hash_entry *));
static boolean elf_m68k_size_dynamic_sections
  PARAMS ((bfd *, struct bfd_link_info *));
static boolean elf_m68k_relocate_section
  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
           Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
static boolean elf_m68k_finish_dynamic_symbol
  PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
           Elf_Internal_Sym *));
static boolean elf_m68k_finish_dynamic_sections
  PARAMS ((bfd *, struct bfd_link_info *));

/* elf32 m68k code, generated by elf.el */
enum reloc_type {
  R_68K_NONE        =   0,
  R_68K_32          =   1,
  R_68K_16          =   2,
  R_68K_8           =   3,
  R_68K_PC32        =   4,
  R_68K_PC16        =   5,
  R_68K_PC8         =   6,
  R_68K_GOT32       =   7,
  R_68K_GOT16       =   8,
  R_68K_GOT8        =   9,
  R_68K_GOT32O      =  10,
  R_68K_GOT16O      =  11,
  R_68K_GOT8O       =  12,
  R_68K_PLT32       =  13,
  R_68K_PLT16       =  14,
  R_68K_PLT8        =  15,
  R_68K_PLT32O      =  16,
  R_68K_PLT16O      =  17,
  R_68K_PLT8O       =  18,
  R_68K_COPY        =  19,
  R_68K_GLOB_DAT    =  20,
  R_68K_JMP_SLOT    =  21,
  R_68K_RELATIVE    =  22,
  R_68K__max
};

static reloc_howto_type howto_table[] = {
  HOWTO(R_68K_NONE,       0, 0, 0, false,0, complain_overflow_dont,     bfd_elf_generic_reloc, "R_68K_NONE",      false, 0, 0x00000000,false),
  HOWTO(R_68K_32,         0, 2,32, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_32",        false, 0, 0xffffffff,false),
  HOWTO(R_68K_16,         0, 1,16, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_16",        false, 0, 0x0000ffff,false),
  HOWTO(R_68K_8,          0, 0, 8, false,0, complain_overflow_bitfield, bfd_elf_generic_reloc, "R_68K_8",         false, 0, 0x000000ff,false),
  HOWTO(R_68K_PC32,       0, 2,32, true, 0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_PC32",      false, 0, 0xffffffff,true),
  HOWTO(R_68K_PC16,       0, 1,16, true, 0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_PC16",      false, 0, 0x0000ffff,true),
  HOWTO(R_68K_PC8,        0, 0, 8, true, 0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_PC8",       false, 0, 0x000000ff,true),
  HOWTO(R_68K_GOT32,      0, 2,32, true, 0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_GOT32",     false, 0, 0xffffffff,true),
  HOWTO(R_68K_GOT16,      0, 1,16, true, 0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_GOT16",     false, 0, 0x0000ffff,true),
  HOWTO(R_68K_GOT8,       0, 0, 8, true, 0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_GOT8",      false, 0, 0x000000ff,true),
  HOWTO(R_68K_GOT32O,     0, 2,32, false,0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_GOT32O",    false, 0, 0xffffffff,false),
  HOWTO(R_68K_GOT16O,     0, 1,16, false,0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_GOT16O",    false, 0, 0x0000ffff,false),
  HOWTO(R_68K_GOT8O,      0, 0, 8, false,0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_GOT8O",     false, 0, 0x000000ff,false),
  HOWTO(R_68K_PLT32,      0, 2,32, true, 0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_PLT32",     false, 0, 0xffffffff,true),
  HOWTO(R_68K_PLT16,      0, 1,16, true, 0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_PLT16",     false, 0, 0x0000ffff,true),
  HOWTO(R_68K_PLT8,       0, 0, 8, true, 0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_PLT8",      false, 0, 0x000000ff,true),
  HOWTO(R_68K_PLT32O,     0, 2,32, false,0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_PLT32O",    false, 0, 0xffffffff,false),
  HOWTO(R_68K_PLT16O,     0, 1,16, false,0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_PLT16O",    false, 0, 0x0000ffff,false),
  HOWTO(R_68K_PLT8O,      0, 0, 8, false,0, complain_overflow_signed,   bfd_elf_generic_reloc, "R_68K_PLT8O",     false, 0, 0x000000ff,false),
  HOWTO(R_68K_COPY,       0, 0, 0, false,0, complain_overflow_dont,     bfd_elf_generic_reloc, "R_68K_COPY",      false, 0, 0xffffffff,false),
  HOWTO(R_68K_GLOB_DAT,   0, 2,32, false,0, complain_overflow_dont,     bfd_elf_generic_reloc, "R_68K_GLOB_DAT",  false, 0, 0xffffffff,false),
  HOWTO(R_68K_JMP_SLOT,   0, 2,32, false,0, complain_overflow_dont,     bfd_elf_generic_reloc, "R_68K_JMP_SLOT",  false, 0, 0xffffffff,false),
  HOWTO(R_68K_RELATIVE,   0, 2,32, false,0, complain_overflow_dont,     bfd_elf_generic_reloc, "R_68K_RELATIVE",  false, 0, 0xffffffff,false),
};

static void
rtype_to_howto (abfd, cache_ptr, dst)
     bfd *abfd;
     arelent *cache_ptr;
     Elf_Internal_Rela *dst;
{
  BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K__max);
  cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)];
}

static void
rtype_to_howto_rel (abfd, cache_ptr, dst)
     bfd *abfd;
     arelent *cache_ptr;
     Elf_Internal_Rel *dst;
{
  BFD_ASSERT (ELF32_R_TYPE(dst->r_info) < (unsigned int) R_68K__max);
  cache_ptr->howto = &howto_table[ELF32_R_TYPE(dst->r_info)];
}

#define elf_info_to_howto rtype_to_howto
#define elf_info_to_howto_rel rtype_to_howto_rel

static const struct { unsigned char bfd_val, elf_val; } reloc_map[] = {
  { BFD_RELOC_NONE, R_68K_NONE },
  { BFD_RELOC_32, R_68K_32 },
  { BFD_RELOC_16, R_68K_16 },
  { BFD_RELOC_8, R_68K_8 },
  { BFD_RELOC_32_PCREL, R_68K_PC32 },
  { BFD_RELOC_16_PCREL, R_68K_PC16 },
  { BFD_RELOC_8_PCREL, R_68K_PC8 },
  { BFD_RELOC_32_GOT_PCREL, R_68K_GOT32 },
  { BFD_RELOC_16_GOT_PCREL, R_68K_GOT16 },
  { BFD_RELOC_8_GOT_PCREL, R_68K_GOT8 },
  { BFD_RELOC_32_GOTOFF, R_68K_GOT32O },
  { BFD_RELOC_16_GOTOFF, R_68K_GOT16O },
  { BFD_RELOC_8_GOTOFF, R_68K_GOT8O },
  { BFD_RELOC_32_PLT_PCREL, R_68K_PLT32 },
  { BFD_RELOC_16_PLT_PCREL, R_68K_PLT16 },
  { BFD_RELOC_8_PLT_PCREL, R_68K_PLT8 },
  { BFD_RELOC_32_PLTOFF, R_68K_PLT32O },
  { BFD_RELOC_16_PLTOFF, R_68K_PLT16O },
  { BFD_RELOC_8_PLTOFF, R_68K_PLT8O },
  { BFD_RELOC_NONE, R_68K_COPY },
  { BFD_RELOC_68K_GLOB_DAT, R_68K_GLOB_DAT },
  { BFD_RELOC_68K_JMP_SLOT, R_68K_JMP_SLOT },
  { BFD_RELOC_68K_RELATIVE, R_68K_RELATIVE },
  { BFD_RELOC_CTOR, R_68K_32 },
};

static reloc_howto_type *
reloc_type_lookup (abfd, code)
     bfd *abfd;
     bfd_reloc_code_real_type code;
{
  unsigned int i;
  for (i = 0; i < sizeof (reloc_map) / sizeof (reloc_map[0]); i++)
    {
      if (reloc_map[i].bfd_val == code)
        return &howto_table[(int) reloc_map[i].elf_val];
    }
  return 0;
}

#define bfd_elf32_bfd_reloc_type_lookup reloc_type_lookup
#define ELF_ARCH bfd_arch_m68k
/* end code generated by elf.el */

#define USE_RELA

\f
/* Functions for the m68k ELF linker.  */

/* The name of the dynamic interpreter.  This is put in the .interp
   section.  */

#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"

/* The size in bytes of an entry in the procedure linkage table.  */

#define PLT_ENTRY_SIZE 20

/* The first entry in a procedure linkage table looks like this.  See
   the SVR4 ABI m68k supplement to see how this works.  */

static const bfd_byte elf_m68k_plt0_entry[PLT_ENTRY_SIZE] =
{
  0x2f, 0x3b, 0x01, 0x70, /* move.l (%pc,addr),-(%sp) */
  0, 0, 0, 0,             /* replaced with offset to .got + 4.  */
  0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,addr]) */
  0, 0, 0, 0,             /* replaced with offset to .got + 8.  */
  0, 0, 0, 0              /* pad out to 20 bytes.  */
};

/* Subsequent entries in a procedure linkage table look like this.  */

static const bfd_byte elf_m68k_plt_entry[PLT_ENTRY_SIZE] =
{
  0x4e, 0xfb, 0x01, 0x71, /* jmp ([%pc,symbol@GOTPC]) */
  0, 0, 0, 0,             /* replaced with offset to symbol's .got entry.  */
  0x2f, 0x3c,             /* move.l #offset,-(%sp) */
  0, 0, 0, 0,             /* replaced with offset into relocation table.  */
  0x60, 0xff,             /* bra.l .plt */
  0, 0, 0, 0              /* replaced with offset to start of .plt.  */
};

/* The m68k linker needs to keep track of the number of relocs that it
   decides to copy in check_relocs for each symbol.  This is so that it
   can discard PC relative relocs if it doesn't need them when linking
   with -Bsymbolic.  We store the information in a field extending the
   regular ELF linker hash table.  */

/* This structure keeps track of the number of PC relative relocs we have
   copied for a given symbol.  */

struct elf_m68k_pcrel_relocs_copied
{
  /* Next section.  */
  struct elf_m68k_pcrel_relocs_copied *next;
  /* A section in dynobj.  */
  asection *section;
  /* Number of relocs copied in this section.  */
  bfd_size_type count;
};

/* m68k ELF linker hash entry.  */

struct elf_m68k_link_hash_entry
{
  struct elf_link_hash_entry root;

  /* Number of PC relative relocs copied for this symbol.  */
  struct elf_m68k_pcrel_relocs_copied *pcrel_relocs_copied;
};

/* m68k ELF linker hash table.  */

struct elf_m68k_link_hash_table
{
  struct elf_link_hash_table root;
};

/* Declare this now that the above structures are defined.  */

static boolean elf_m68k_discard_copies
  PARAMS ((struct elf_m68k_link_hash_entry *, PTR));

/* Traverse an m68k ELF linker hash table.  */

#define elf_m68k_link_hash_traverse(table, func, info)                  \
  (elf_link_hash_traverse                                               \
   (&(table)->root,                                                     \
    (boolean (*) PARAMS ((struct elf_link_hash_entry *, PTR))) (func),  \
    (info)))

/* Get the m68k ELF linker hash table from a link_info structure.  */

#define elf_m68k_hash_table(p) \
  ((struct elf_m68k_link_hash_table *) (p)->hash)

/* Create an entry in an m68k ELF linker hash table.  */

static struct bfd_hash_entry *
elf_m68k_link_hash_newfunc (entry, table, string)
     struct bfd_hash_entry *entry;
     struct bfd_hash_table *table;
     const char *string;
{
  struct elf_m68k_link_hash_entry *ret =
    (struct elf_m68k_link_hash_entry *) entry;

  /* Allocate the structure if it has not already been allocated by a
     subclass.  */
  if (ret == (struct elf_m68k_link_hash_entry *) NULL)
    ret = ((struct elf_m68k_link_hash_entry *)
           bfd_hash_allocate (table,
                              sizeof (struct elf_m68k_link_hash_entry)));
  if (ret == (struct elf_m68k_link_hash_entry *) NULL)
    return (struct bfd_hash_entry *) ret;

  /* Call the allocation method of the superclass.  */
  ret = ((struct elf_m68k_link_hash_entry *)
         _bfd_elf_link_hash_newfunc ((struct bfd_hash_entry *) ret,
                                     table, string));
  if (ret != (struct elf_m68k_link_hash_entry *) NULL)
    {
      ret->pcrel_relocs_copied = NULL;
    }

  return (struct bfd_hash_entry *) ret;
}

/* Create an m68k ELF linker hash table.  */

static struct bfd_link_hash_table *
elf_m68k_link_hash_table_create (abfd)
     bfd *abfd;
{
  struct elf_m68k_link_hash_table *ret;

  ret = ((struct elf_m68k_link_hash_table *)
         bfd_alloc (abfd, sizeof (struct elf_m68k_link_hash_table)));
  if (ret == (struct elf_m68k_link_hash_table *) NULL)
    return NULL;

  if (! _bfd_elf_link_hash_table_init (&ret->root, abfd,
                                       elf_m68k_link_hash_newfunc))
    {
      bfd_release (abfd, ret);
      return NULL;
    }

  return &ret->root.root;
}

/* Look through the relocs for a section during the first phase, and
   allocate space in the global offset table or procedure linkage
   table.  */

static boolean
elf_m68k_check_relocs (abfd, info, sec, relocs)
     bfd *abfd;
     struct bfd_link_info *info;
     asection *sec;
     const Elf_Internal_Rela *relocs;
{
  bfd *dynobj;
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes;
  bfd_vma *local_got_offsets;
  const Elf_Internal_Rela *rel;
  const Elf_Internal_Rela *rel_end;
  asection *sgot;
  asection *srelgot;
  asection *sreloc;

  if (info->relocateable)
    return true;

  dynobj = elf_hash_table (info)->dynobj;
  symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (abfd);
  local_got_offsets = elf_local_got_offsets (abfd);

  sgot = NULL;
  srelgot = NULL;
  sreloc = NULL;

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

      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))
        {
        case R_68K_GOT8:
        case R_68K_GOT16:
        case R_68K_GOT32:
          if (h != NULL
              && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
            break;
          /* Fall through.  */
        case R_68K_GOT8O:
        case R_68K_GOT16O:
        case R_68K_GOT32O:
          /* This symbol requires a global offset table entry.  */

          if (dynobj == NULL)
            {
              /* Create the .got section.  */
              elf_hash_table (info)->dynobj = dynobj = abfd;
              if (!_bfd_elf_create_got_section (dynobj, info))
                return false;
            }

          if (sgot == NULL)
            {
              sgot = bfd_get_section_by_name (dynobj, ".got");
              BFD_ASSERT (sgot != NULL);
            }

          if (srelgot == NULL
              && (h != NULL || info->shared))
            {
              srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
              if (srelgot == NULL)
                {
                  srelgot = bfd_make_section (dynobj, ".rela.got");
                  if (srelgot == NULL
                      || !bfd_set_section_flags (dynobj, srelgot,
                                                 (SEC_ALLOC
                                                  | SEC_LOAD
                                                  | SEC_HAS_CONTENTS
                                                  | SEC_IN_MEMORY
                                                  | SEC_LINKER_CREATED
                                                  | SEC_READONLY))
                      || !bfd_set_section_alignment (dynobj, srelgot, 2))
                    return false;
                }
            }

          if (h != NULL)
            {
              if (h->got_offset != (bfd_vma) -1)
                {
                  /* We have already allocated space in the .got.  */
                  break;
                }
              h->got_offset = sgot->_raw_size;

              /* Make sure this symbol is output as a dynamic symbol.  */
              if (h->dynindx == -1)
                {
                  if (!bfd_elf32_link_record_dynamic_symbol (info, h))
                    return false;
                }

              srelgot->_raw_size += sizeof (Elf32_External_Rela);
            }
          else
            {
              /* This is a global offset table entry for a local
                 symbol.  */
              if (local_got_offsets == NULL)
                {
                  size_t size;
                  register unsigned int i;

                  size = symtab_hdr->sh_info * sizeof (bfd_vma);
                  local_got_offsets = (bfd_vma *) bfd_alloc (abfd, size);
                  if (local_got_offsets == NULL)
                    return false;
                  elf_local_got_offsets (abfd) = local_got_offsets;
                  for (i = 0; i < symtab_hdr->sh_info; i++)
                    local_got_offsets[i] = (bfd_vma) -1;
                }
              if (local_got_offsets[r_symndx] != (bfd_vma) -1)
                {
                  /* We have already allocated space in the .got.  */
                  break;
                }
              local_got_offsets[r_symndx] = sgot->_raw_size;

              if (info->shared)
                {
                  /* If we are generating a shared object, we need to
                     output a R_68K_RELATIVE reloc so that the dynamic
                     linker can adjust this GOT entry.  */
                  srelgot->_raw_size += sizeof (Elf32_External_Rela);
                }
            }

          sgot->_raw_size += 4;
          break;

        case R_68K_PLT8:
        case R_68K_PLT16:
        case R_68K_PLT32:
          /* This symbol requires a procedure linkage table entry.  We
             actually build the entry in adjust_dynamic_symbol,
             because this might be a case of linking PIC code which is
             never referenced by a dynamic object, in which case we
             don't need to generate a procedure linkage table entry
             after all.  */

          /* If this is a local symbol, we resolve it directly without
             creating a procedure linkage table entry.  */
          if (h == NULL)
            continue;

          h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
          break;

        case R_68K_PLT8O:
        case R_68K_PLT16O:
        case R_68K_PLT32O:
          /* This symbol requires a procedure linkage table entry.  */

          if (h == NULL)
            {
              /* It does not make sense to have this relocation for a
                 local symbol.  FIXME: does it?  How to handle it if
                 it does make sense?  */
              bfd_set_error (bfd_error_bad_value);
              return false;
            }

          /* Make sure this symbol is output as a dynamic symbol.  */
          if (h->dynindx == -1)
            {
              if (!bfd_elf32_link_record_dynamic_symbol (info, h))
                return false;
            }

          h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
          break;

        case R_68K_PC8:
        case R_68K_PC16:
        case R_68K_PC32:
          /* If we are creating a shared library and this is not a local
             symbol, we need to copy the reloc into the shared library.
             However when linking with -Bsymbolic and this is a global
             symbol which is defined in an object we are including in the
             link (i.e., DEF_REGULAR is set), then we can resolve the
             reloc directly.  At this point we have not seen all the input
             files, so it is possible that DEF_REGULAR is not set now but
             will be set later (it is never cleared).  We account for that
             possibility below by storing information in the
             pcrel_relocs_copied field of the hash table entry.  */
          if (!(info->shared
                && (sec->flags & SEC_ALLOC) != 0
                && h != NULL
                && (!info->symbolic
                    || (h->elf_link_hash_flags
                        & ELF_LINK_HASH_DEF_REGULAR) == 0)))
            break;
          /* Fall through.  */
        case R_68K_8:
        case R_68K_16:
        case R_68K_32:
          /* If we are creating a shared library, we need to copy the
             reloc into the shared library.  */
          if (info->shared
              && (sec->flags & SEC_ALLOC) != 0)
            {
              /* When creating a shared object, we must copy these
                 reloc types into the output file.  We create a reloc
                 section in dynobj and make room for this reloc.  */
              if (sreloc == NULL)
                {
                  const char *name;

                  name = (bfd_elf_string_from_elf_section
                          (abfd,
                           elf_elfheader (abfd)->e_shstrndx,
                           elf_section_data (sec)->rel_hdr.sh_name));
                  if (name == NULL)
                    return false;

                  BFD_ASSERT (strncmp (name, ".rela", 5) == 0
                              && strcmp (bfd_get_section_name (abfd, sec),
                                         name + 5) == 0);

                  sreloc = bfd_get_section_by_name (dynobj, name);
                  if (sreloc == NULL)
                    {
                      sreloc = bfd_make_section (dynobj, name);
                      if (sreloc == NULL
                          || !bfd_set_section_flags (dynobj, sreloc,
                                                     (SEC_ALLOC
                                                      | SEC_LOAD
                                                      | SEC_HAS_CONTENTS
                                                      | SEC_IN_MEMORY
                                                      | SEC_LINKER_CREATED
                                                      | SEC_READONLY))
                          || !bfd_set_section_alignment (dynobj, sreloc, 2))
                        return false;
                    }
                }

              sreloc->_raw_size += sizeof (Elf32_External_Rela);

              /* If we are linking with -Bsymbolic, we count the number of
                 PC relative relocations we have entered for this symbol,
                 so that we can discard them again if the symbol is later
                 defined by a regular object.  Note that this function is
                 only called if we are using an m68kelf linker hash table,
                 which means that h is really a pointer to an
                 elf_m68k_link_hash_entry.  */
              if ((ELF32_R_TYPE (rel->r_info) == R_68K_PC8
                   || ELF32_R_TYPE (rel->r_info) == R_68K_PC16
                   || ELF32_R_TYPE (rel->r_info) == R_68K_PC32)
                  && info->symbolic)
                {
                  struct elf_m68k_link_hash_entry *eh;
                  struct elf_m68k_pcrel_relocs_copied *p;

                  eh = (struct elf_m68k_link_hash_entry *) h;

                  for (p = eh->pcrel_relocs_copied; p != NULL; p = p->next)
                    if (p->section == sreloc)
                      break;

                  if (p == NULL)
                    {
                      p = ((struct elf_m68k_pcrel_relocs_copied *)
                           bfd_alloc (dynobj, sizeof *p));
                      if (p == NULL)
                        return false;
                      p->next = eh->pcrel_relocs_copied;
                      eh->pcrel_relocs_copied = p;
                      p->section = sreloc;
                      p->count = 0;
                    }

                  ++p->count;
                }
            }

          break;

        default:
          break;
        }
    }

  return true;
}

/* Adjust a symbol defined by a dynamic object and referenced by a
   regular object.  The current definition is in some section of the
   dynamic object, but we're not including those sections.  We have to
   change the definition to something the rest of the link can
   understand.  */

static boolean
elf_m68k_adjust_dynamic_symbol (info, h)
     struct bfd_link_info *info;
     struct elf_link_hash_entry *h;
{
  bfd *dynobj;
  asection *s;
  unsigned int power_of_two;

  dynobj = elf_hash_table (info)->dynobj;

  /* Make sure we know what is going on here.  */
  BFD_ASSERT (dynobj != NULL
              && ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT)
                  || h->weakdef != NULL
                  || ((h->elf_link_hash_flags
                       & ELF_LINK_HASH_DEF_DYNAMIC) != 0
                      && (h->elf_link_hash_flags
                          & ELF_LINK_HASH_REF_REGULAR) != 0
                      && (h->elf_link_hash_flags
                          & ELF_LINK_HASH_DEF_REGULAR) == 0)));

  /* If this is a function, put it in the procedure linkage table.  We
     will fill in the contents of the procedure linkage table later,
     when we know the address of the .got section.  */
  if (h->type == STT_FUNC
      || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
    {
      if (! info->shared
          && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
          && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0
          /* We must always create the plt entry if it was referenced
             by a PLTxxO relocation.  In this case we already recorded
             it as a dynamic symbol.  */
          && h->dynindx == -1)
        {
          /* This case can occur if we saw a PLTxx reloc in an input
             file, but the symbol was never referred to by a dynamic
             object.  In such a case, we don't actually need to build
             a procedure linkage table, and we can just do a PCxx
             reloc instead.  */
          BFD_ASSERT ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0);
          return true;
        }

      /* Make sure this symbol is output as a dynamic symbol.  */
      if (h->dynindx == -1)
        {
          if (! bfd_elf32_link_record_dynamic_symbol (info, h))
            return false;
        }

      s = bfd_get_section_by_name (dynobj, ".plt");
      BFD_ASSERT (s != NULL);

      /* If this is the first .plt entry, make room for the special
         first entry.  */
      if (s->_raw_size == 0)
        s->_raw_size += PLT_ENTRY_SIZE;

      /* If this symbol is not defined in a regular file, and we are
         not generating a shared library, then set the symbol to this
         location in the .plt.  This is required to make function
         pointers compare as equal between the normal executable and
         the shared library.  */
      if (!info->shared
          && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
        {
          h->root.u.def.section = s;
          h->root.u.def.value = s->_raw_size;
        }

      h->plt_offset = s->_raw_size;

      /* Make room for this entry.  */
      s->_raw_size += PLT_ENTRY_SIZE;

      /* We also need to make an entry in the .got.plt section, which
         will be placed in the .got section by the linker script.  */

      s = bfd_get_section_by_name (dynobj, ".got.plt");
      BFD_ASSERT (s != NULL);
      s->_raw_size += 4;

      /* We also need to make an entry in the .rela.plt section.  */

      s = bfd_get_section_by_name (dynobj, ".rela.plt");
      BFD_ASSERT (s != NULL);
      s->_raw_size += sizeof (Elf32_External_Rela);

      return true;
    }

  /* If this is a weak symbol, and there is a real definition, the
     processor independent code will have arranged for us to see the
     real definition first, and we can just use the same value.  */
  if (h->weakdef != NULL)
    {
      BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
                  || h->weakdef->root.type == bfd_link_hash_defweak);
      h->root.u.def.section = h->weakdef->root.u.def.section;
      h->root.u.def.value = h->weakdef->root.u.def.value;
      return true;
    }

  /* This is a reference to a symbol defined by a dynamic object which
     is not a function.  */

  /* If we are creating a shared library, we must presume that the
     only references to the symbol are via the global offset table.
     For such cases we need not do anything here; the relocations will
     be handled correctly by relocate_section.  */
  if (info->shared)
    return true;

  /* We must allocate the symbol in our .dynbss section, which will
     become part of the .bss section of the executable.  There will be
     an entry for this symbol in the .dynsym section.  The dynamic
     object will contain position independent code, so all references
     from the dynamic object to this symbol will go through the global
     offset table.  The dynamic linker will use the .dynsym entry to
     determine the address it must put in the global offset table, so
     both the dynamic object and the regular object will refer to the
     same memory location for the variable.  */

  s = bfd_get_section_by_name (dynobj, ".dynbss");
  BFD_ASSERT (s != NULL);

  /* We must generate a R_68K_COPY reloc to tell the dynamic linker to
     copy the initial value out of the dynamic object and into the
     runtime process image.  We need to remember the offset into the
     .rela.bss section we are going to use.  */
  if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
    {
      asection *srel;

      srel = bfd_get_section_by_name (dynobj, ".rela.bss");
      BFD_ASSERT (srel != NULL);
      srel->_raw_size += sizeof (Elf32_External_Rela);
      h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
    }

  /* We need to figure out the alignment required for this symbol.  I
     have no idea how ELF linkers handle this.  */
  power_of_two = bfd_log2 (h->size);
  if (power_of_two > 3)
    power_of_two = 3;

  /* Apply the required alignment.  */
  s->_raw_size = BFD_ALIGN (s->_raw_size,
                            (bfd_size_type) (1 << power_of_two));
  if (power_of_two > bfd_get_section_alignment (dynobj, s))
    {
      if (!bfd_set_section_alignment (dynobj, s, power_of_two))
        return false;
    }

  /* Define the symbol as being at this point in the section.  */
  h->root.u.def.section = s;
  h->root.u.def.value = s->_raw_size;

  /* Increment the section size to make room for the symbol.  */
  s->_raw_size += h->size;

  return true;
}

/* Set the sizes of the dynamic sections.  */

static boolean
elf_m68k_size_dynamic_sections (output_bfd, info)
     bfd *output_bfd;
     struct bfd_link_info *info;
{
  bfd *dynobj;
  asection *s;
  boolean plt;
  boolean relocs;
  boolean reltext;

  dynobj = elf_hash_table (info)->dynobj;
  BFD_ASSERT (dynobj != NULL);

  if (elf_hash_table (info)->dynamic_sections_created)
    {
      /* Set the contents of the .interp section to the interpreter.  */
      if (!info->shared)
        {
          s = bfd_get_section_by_name (dynobj, ".interp");
          BFD_ASSERT (s != NULL);
          s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
          s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
        }
    }
  else
    {
      /* We may have created entries in the .rela.got section.
         However, if we are not creating the dynamic sections, we will
         not actually use these entries.  Reset the size of .rela.got,
         which will cause it to get stripped from the output file
         below.  */
      s = bfd_get_section_by_name (dynobj, ".rela.got");
      if (s != NULL)
        s->_raw_size = 0;
    }

  /* If this is a -Bsymbolic shared link, then we need to discard all PC
     relative relocs against symbols defined in a regular object.  We
     allocated space for them in the check_relocs routine, but we will not
     fill them in in the relocate_section routine.  */
  if (info->shared && info->symbolic)
    elf_m68k_link_hash_traverse (elf_m68k_hash_table (info),
                                 elf_m68k_discard_copies,
                                 (PTR) NULL);

  /* The check_relocs and adjust_dynamic_symbol entry points have
     determined the sizes of the various dynamic sections.  Allocate
     memory for them.  */
  plt = false;
  relocs = false;
  reltext = false;
  for (s = dynobj->sections; s != NULL; s = s->next)
    {
      const char *name;
      boolean strip;

      if ((s->flags & SEC_LINKER_CREATED) == 0)
        continue;

      /* It's OK to base decisions on the section name, because none
         of the dynobj section names depend upon the input files.  */
      name = bfd_get_section_name (dynobj, s);

      strip = false;

      if (strcmp (name, ".plt") == 0)
        {
          if (s->_raw_size == 0)
            {
              /* Strip this section if we don't need it; see the
                 comment below.  */
              strip = true;
            }
          else
            {
              /* Remember whether there is a PLT.  */
              plt = true;
            }
        }
      else if (strncmp (name, ".rela", 5) == 0)
        {
          if (s->_raw_size == 0)
            {
              /* If we don't need this section, strip it from the
                 output file.  This is mostly to handle .rela.bss and
                 .rela.plt.  We must create both sections in
                 create_dynamic_sections, because they must be created
                 before the linker maps input sections to output
                 sections.  The linker does that before
                 adjust_dynamic_symbol is called, and it is that
                 function which decides whether anything needs to go
                 into these sections.  */
              strip = true;
            }
          else
            {
              asection *target;

              /* Remember whether there are any reloc sections other
                 than .rela.plt.  */
              if (strcmp (name, ".rela.plt") != 0)
                {
                  const char *outname;

                  relocs = true;

                  /* If this relocation section applies to a read only
                     section, then we probably need a DT_TEXTREL
                     entry.  .rela.plt is actually associated with
                     .got.plt, which is never readonly.  */
                  outname = bfd_get_section_name (output_bfd,
                                                  s->output_section);
                  target = bfd_get_section_by_name (output_bfd, outname + 5);
                  if (target != NULL
                      && (target->flags & SEC_READONLY) != 0)
                    reltext = true;
                }

              /* We use the reloc_count field as a counter if we need
                 to copy relocs into the output file.  */
              s->reloc_count = 0;
            }
        }
      else if (strncmp (name, ".got", 4) != 0)
        {
          /* It's not one of our sections, so don't allocate space.  */
          continue;
        }

      if (strip)
        {
          asection **spp;

          for (spp = &s->output_section->owner->sections;
               *spp != s->output_section;
               spp = &(*spp)->next)
            ;
          *spp = s->output_section->next;
          --s->output_section->owner->section_count;

          continue;
        }

      /* Allocate memory for the section contents.  */
      s->contents = (bfd_byte *) bfd_alloc (dynobj, s->_raw_size);
      if (s->contents == NULL && s->_raw_size != 0)
        return false;
    }

  if (elf_hash_table (info)->dynamic_sections_created)
    {
      /* Add some entries to the .dynamic section.  We fill in the
         values later, in elf_m68k_finish_dynamic_sections, but we
         must add the entries now so that we get the correct size for
         the .dynamic section.  The DT_DEBUG entry is filled in by the
         dynamic linker and used by the debugger.  */
      if (!info->shared)
        {
          if (!bfd_elf32_add_dynamic_entry (info, DT_DEBUG, 0))
            return false;
        }

      if (plt)
        {
          if (!bfd_elf32_add_dynamic_entry (info, DT_PLTGOT, 0)
              || !bfd_elf32_add_dynamic_entry (info, DT_PLTRELSZ, 0)
              || !bfd_elf32_add_dynamic_entry (info, DT_PLTREL, DT_RELA)
              || !bfd_elf32_add_dynamic_entry (info, DT_JMPREL, 0))
            return false;
        }

      if (relocs)
        {
          if (!bfd_elf32_add_dynamic_entry (info, DT_RELA, 0)
              || !bfd_elf32_add_dynamic_entry (info, DT_RELASZ, 0)
              || !bfd_elf32_add_dynamic_entry (info, DT_RELAENT,
                                               sizeof (Elf32_External_Rela)))
            return false;
        }

      if (reltext)
        {
          if (!bfd_elf32_add_dynamic_entry (info, DT_TEXTREL, 0))
            return false;
        }
    }

  return true;
}

/* This function is called via elf_m68k_link_hash_traverse if we are
   creating a shared object with -Bsymbolic.  It discards the space
   allocated to copy PC relative relocs against symbols which are defined
   in regular objects.  We allocated space for them in the check_relocs
   routine, but we won't fill them in in the relocate_section routine.  */

/*ARGSUSED*/
static boolean
elf_m68k_discard_copies (h, ignore)
     struct elf_m68k_link_hash_entry *h;
     PTR ignore;
{
  struct elf_m68k_pcrel_relocs_copied *s;

  /* We only discard relocs for symbols defined in a regular object.  */
  if ((h->root.elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
    return true;

  for (s = h->pcrel_relocs_copied; s != NULL; s = s->next)
    s->section->_raw_size -= s->count * sizeof (Elf32_External_Rela);

  return true;
}

/* Relocate an M68K ELF section.  */

static boolean
elf_m68k_relocate_section (output_bfd, info, input_bfd, input_section,
                           contents, relocs, local_syms, local_sections)
     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;
{
  bfd *dynobj;
  Elf_Internal_Shdr *symtab_hdr;
  struct elf_link_hash_entry **sym_hashes;
  bfd_vma *local_got_offsets;
  asection *sgot;
  asection *splt;
  asection *sreloc;
  Elf_Internal_Rela *rel;
  Elf_Internal_Rela *relend;

  dynobj = elf_hash_table (info)->dynobj;
  symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
  sym_hashes = elf_sym_hashes (input_bfd);
  local_got_offsets = elf_local_got_offsets (input_bfd);

  sgot = NULL;
  splt = NULL;
  sreloc = NULL;

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

      r_type = ELF32_R_TYPE (rel->r_info);
      if (r_type < 0 || r_type >= (int) R_68K__max)
        {
          bfd_set_error (bfd_error_bad_value);
          return false;
        }
      howto = howto_table + 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 (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
                {
                  sec = local_sections[r_symndx];
                  rel->r_addend += sec->output_offset + sym->st_value;
                }
            }

          continue;
        }

      /* This is a final link.  */
      h = NULL;
      sym = NULL;
      sec = NULL;
      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];
          while (h->root.type == bfd_link_hash_indirect
                 || h->root.type == bfd_link_hash_warning)
            h = (struct elf_link_hash_entry *) h->root.u.i.link;
          if (h->root.type == bfd_link_hash_defined
              || h->root.type == bfd_link_hash_defweak)
            {
              sec = h->root.u.def.section;
              if (((r_type == R_68K_PLT8
                    || r_type == R_68K_PLT16
                    || r_type == R_68K_PLT32
                    || r_type == R_68K_PLT8O
                    || r_type == R_68K_PLT16O
                    || r_type == R_68K_PLT32O)
                   && h->plt_offset != (bfd_vma) -1)
                  || ((r_type == R_68K_GOT8O
                       || r_type == R_68K_GOT16O
                       || r_type == R_68K_GOT32O
                       || ((r_type == R_68K_GOT8
                            || r_type == R_68K_GOT16
                            || r_type == R_68K_GOT32)
                           && strcmp (h->root.root.string,
                                      "_GLOBAL_OFFSET_TABLE_") != 0))
                      && elf_hash_table (info)->dynamic_sections_created
                      && (! info->shared
                          || (! info->symbolic && h->dynindx != -1)
                          || (h->elf_link_hash_flags
                              & ELF_LINK_HASH_DEF_REGULAR) == 0))
                  || (info->shared
                      && ((! info->symbolic && h->dynindx != -1)
                          || (h->elf_link_hash_flags
                              & ELF_LINK_HASH_DEF_REGULAR) == 0)
                      && (input_section->flags & SEC_ALLOC) != 0
                      && (r_type == R_68K_8
                          || r_type == R_68K_16
                          || r_type == R_68K_32
                          || r_type == R_68K_PC8
                          || r_type == R_68K_PC16
                          || r_type == R_68K_PC32)))
                {
                  /* In these cases, we don't need the relocation
                     value.  We check specially because in some
                     obscure cases sec->output_section will be NULL.  */
                  relocation = 0;
                }
              else
                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 && !info->symbolic)
            relocation = 0;
          else
            {
              if (!(info->callbacks->undefined_symbol
                    (info, h->root.root.string, input_bfd,
                     input_section, rel->r_offset)))
                return false;
              relocation = 0;
            }
        }

      switch (r_type)
        {
        case R_68K_GOT8:
        case R_68K_GOT16:
        case R_68K_GOT32:
          /* Relocation is to the address of the entry for this symbol
             in the global offset table.  */
          if (h != NULL
              && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
            break;
          /* Fall through.  */
        case R_68K_GOT8O:
        case R_68K_GOT16O:
        case R_68K_GOT32O:
          /* Relocation is the offset of the entry for this symbol in
             the global offset table.  */

          {
            bfd_vma off;

            if (sgot == NULL)
              {
                sgot = bfd_get_section_by_name (dynobj, ".got");
                BFD_ASSERT (sgot != NULL);
              }

            if (h != NULL)
              {
                off = h->got_offset;
                BFD_ASSERT (off != (bfd_vma) -1);

                if (!elf_hash_table (info)->dynamic_sections_created
                    || (info->shared
                        && (info->symbolic || h->dynindx == -1)
                        && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
                  {
                    /* This is actually a static link, or it is a
                       -Bsymbolic link and the symbol is defined
                       locally, or the symbol was forced to be local
                       because of a version file..  We must initialize
                       this entry in the global offset table.  Since
                       the offset must always be a multiple of 4, we
                       use the least significant bit to record whether
                       we have initialized it already.

                       When doing a dynamic link, we create a .rela.got
                       relocation entry to initialize the value.  This
                       is done in the finish_dynamic_symbol routine.  */
                    if ((off & 1) != 0)
                      off &= ~1;
                    else
                      {
                        bfd_put_32 (output_bfd, relocation,
                                    sgot->contents + off);
                        h->got_offset |= 1;
                      }
                  }
              }
            else
              {
                BFD_ASSERT (local_got_offsets != NULL
                            && local_got_offsets[r_symndx] != (bfd_vma) -1);

                off = local_got_offsets[r_symndx];

                /* The offset must always be a multiple of 4.  We use
                   the least significant bit to record whether we have
                   already generated the necessary reloc.  */
                if ((off & 1) != 0)
                  off &= ~1;
                else
                  {
                    bfd_put_32 (output_bfd, relocation, sgot->contents + off);

                    if (info->shared)
                      {
                        asection *srelgot;
                        Elf_Internal_Rela outrel;

                        srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
                        BFD_ASSERT (srelgot != NULL);

                        outrel.r_offset = (sgot->output_section->vma
                                           + sgot->output_offset
                                           + off);
                        outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
                        outrel.r_addend = relocation;
                        bfd_elf32_swap_reloca_out (output_bfd, &outrel,
                                                   (((Elf32_External_Rela *)
                                                     srelgot->contents)
                                                    + srelgot->reloc_count));
                        ++srelgot->reloc_count;
                      }

                    local_got_offsets[r_symndx] |= 1;
                  }
              }

            relocation = sgot->output_offset + off;
            if (r_type == R_68K_GOT8O
                || r_type == R_68K_GOT16O
                || r_type == R_68K_GOT32O)
              {
                /* This relocation does not use the addend.  */
                rel->r_addend = 0;
              }
            else
              relocation += sgot->output_section->vma;
          }
          break;

        case R_68K_PLT8:
        case R_68K_PLT16:
        case R_68K_PLT32:
          /* Relocation is to the entry for this symbol in the
             procedure linkage table.  */

          /* Resolve a PLTxx reloc against a local symbol directly,
             without using the procedure linkage table.  */
          if (h == NULL)
            break;

          if (h->plt_offset == (bfd_vma) -1)
            {
              /* We didn't make a PLT entry for this symbol.  This
                 happens when statically linking PIC code, or when
                 using -Bsymbolic.  */
              break;
            }

          if (splt == NULL)
            {
              splt = bfd_get_section_by_name (dynobj, ".plt");
              BFD_ASSERT (splt != NULL);
            }

          relocation = (splt->output_section->vma
                        + splt->output_offset
                        + h->plt_offset);
          break;

        case R_68K_PLT8O:
        case R_68K_PLT16O:
        case R_68K_PLT32O:
          /* Relocation is the offset of the entry for this symbol in
             the procedure linkage table.  */
          BFD_ASSERT (h != NULL && h->plt_offset == (bfd_vma) -1);

          if (splt == NULL)
            {
              splt = bfd_get_section_by_name (dynobj, ".plt");
              BFD_ASSERT (splt != NULL);
            }

          relocation = h->plt_offset;

          /* This relocation does not use the addend.  */
          rel->r_addend = 0;

          break;

        case R_68K_PC8:
        case R_68K_PC16:
        case R_68K_PC32:
          if (h == NULL)
            break;
          /* Fall through.  */
        case R_68K_8:
        case R_68K_16:
        case R_68K_32:
          if (info->shared
              && (input_section->flags & SEC_ALLOC) != 0
              && ((r_type != R_68K_PC8
                   && r_type != R_68K_PC16
                   && r_type != R_68K_PC32)
                  || (!info->symbolic
                      || (h->elf_link_hash_flags
                          & ELF_LINK_HASH_DEF_REGULAR) == 0)))
            {
              Elf_Internal_Rela outrel;
              boolean skip, relocate;

              /* When generating a shared object, these relocations
                 are copied into the output file to be resolved at run
                 time.  */

              if (sreloc == NULL)
                {
                  const char *name;

                  name = (bfd_elf_string_from_elf_section
                          (input_bfd,
                           elf_elfheader (input_bfd)->e_shstrndx,
                           elf_section_data (input_section)->rel_hdr.sh_name));
                  if (name == NULL)
                    return false;

                  BFD_ASSERT (strncmp (name, ".rela", 5) == 0
                              && strcmp (bfd_get_section_name (input_bfd,
                                                               input_section),
                                         name + 5) == 0);

                  sreloc = bfd_get_section_by_name (dynobj, name);
                  BFD_ASSERT (sreloc != NULL);
                }

              skip = false;

              if (elf_section_data (input_section)->stab_info == NULL)
                outrel.r_offset = rel->r_offset;
              else
                {
                  bfd_vma off;

                  off = (_bfd_stab_section_offset
                         (output_bfd, &elf_hash_table (info)->stab_info,
                          input_section,
                          &elf_section_data (input_section)->stab_info,
                          rel->r_offset));
                  if (off == (bfd_vma) -1)
                    skip = true;
                  outrel.r_offset = off;
                }

              outrel.r_offset += (input_section->output_section->vma
                                  + input_section->output_offset);

              if (skip)
                {
                  memset (&outrel, 0, sizeof outrel);
                  relocate = false;
                }
              /* h->dynindx may be -1 if the symbol was marked to
                 become local.  */
              else if (h != NULL
                       && ((! info->symbolic && h->dynindx != -1)
                           || (h->elf_link_hash_flags
                               & ELF_LINK_HASH_DEF_REGULAR) == 0))
                {
                  BFD_ASSERT (h->dynindx != -1);
                  relocate = false;
                  outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
                  outrel.r_addend = relocation + rel->r_addend;
                }
              else
                {
                  if (r_type == R_68K_32)
                    {
                      relocate = true;
                      outrel.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
                      outrel.r_addend = relocation + rel->r_addend;
                    }
                  else
                    {
                      long indx;

                      if (h == NULL)
                        sec = local_sections[r_symndx];
                      else
                        {
                          BFD_ASSERT (h->root.type == bfd_link_hash_defined
                                      || (h->root.type
                                          == bfd_link_hash_defweak));
                          sec = h->root.u.def.section;
                        }
                      if (sec != NULL && bfd_is_abs_section (sec))
                        indx = 0;
                      else if (sec == NULL || sec->owner == NULL)
                        {
                          bfd_set_error (bfd_error_bad_value);
                          return false;
                        }
                      else
                        {
                          asection *osec;

                          osec = sec->output_section;
                          indx = elf_section_data (osec)->dynindx;
                          if (indx == 0)
                            abort ();
                        }

                      relocate = false;
                      outrel.r_info = ELF32_R_INFO (indx, r_type);
                      outrel.r_addend = relocation + rel->r_addend;
                    }
                }

              bfd_elf32_swap_reloca_out (output_bfd, &outrel,
                                         (((Elf32_External_Rela *)
                                           sreloc->contents)
                                          + sreloc->reloc_count));
              ++sreloc->reloc_count;

              /* This reloc will be computed at runtime, so there's no
                 need to do anything now, except for R_68K_32
                 relocations that have been turned into
                 R_68K_RELATIVE.  */
              if (!relocate)
                continue;
            }

          break;

        default:
          break;
        }

      r = _bfd_final_link_relocate (howto, input_bfd, input_section,
                                    contents, rel->r_offset,
                                    relocation, rel->r_addend);

      if (r != bfd_reloc_ok)
        {
          switch (r)
            {
            default:
            case bfd_reloc_outofrange:
              abort ();
            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)
                      return false;
                    if (*name == '\0')
                      name = bfd_section_name (input_bfd, sec);
                  }
                if (!(info->callbacks->reloc_overflow
                      (info, name, howto->name, (bfd_vma) 0,
                       input_bfd, input_section, rel->r_offset)))
                  return false;
              }
              break;
            }
        }
    }

  return true;
}

/* Finish up dynamic symbol handling.  We set the contents of various
   dynamic sections here.  */

static boolean
elf_m68k_finish_dynamic_symbol (output_bfd, info, h, sym)
     bfd *output_bfd;
     struct bfd_link_info *info;
     struct elf_link_hash_entry *h;
     Elf_Internal_Sym *sym;
{
  bfd *dynobj;

  dynobj = elf_hash_table (info)->dynobj;

  if (h->plt_offset != (bfd_vma) -1)
    {
      asection *splt;
      asection *sgot;
      asection *srela;
      bfd_vma plt_index;
      bfd_vma got_offset;
      Elf_Internal_Rela rela;

      /* This symbol has an entry in the procedure linkage table.  Set
         it up.  */

      BFD_ASSERT (h->dynindx != -1);

      splt = bfd_get_section_by_name (dynobj, ".plt");
      sgot = bfd_get_section_by_name (dynobj, ".got.plt");
      srela = bfd_get_section_by_name (dynobj, ".rela.plt");
      BFD_ASSERT (splt != NULL && sgot != NULL && srela != NULL);

      /* Get the index in the procedure linkage table which
         corresponds to this symbol.  This is the index of this symbol
         in all the symbols for which we are making plt entries.  The
         first entry in the procedure linkage table is reserved.  */
      plt_index = h->plt_offset / PLT_ENTRY_SIZE - 1;

      /* Get the offset into the .got table of the entry that
         corresponds to this function.  Each .got entry is 4 bytes.
         The first three are reserved.  */
      got_offset = (plt_index + 3) * 4;

      /* Fill in the entry in the procedure linkage table.  */
      memcpy (splt->contents + h->plt_offset, elf_m68k_plt_entry,
              PLT_ENTRY_SIZE);
      /* The offset is relative to the first extension word.  */
      bfd_put_32 (output_bfd,
                  (sgot->output_section->vma
                   + sgot->output_offset
                   + got_offset
                   - (splt->output_section->vma
                      + h->plt_offset + 2)),
                  splt->contents + h->plt_offset + 4);

      bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rela),
                  splt->contents + h->plt_offset + 10);
      bfd_put_32 (output_bfd, - (h->plt_offset + 16),
                  splt->contents + h->plt_offset + 16);

      /* Fill in the entry in the global offset table.  */
      bfd_put_32 (output_bfd,
                  (splt->output_section->vma
                   + splt->output_offset
                   + h->plt_offset
                   + 8),
                  sgot->contents + got_offset);

      /* Fill in the entry in the .rela.plt section.  */
      rela.r_offset = (sgot->output_section->vma
                       + sgot->output_offset
                       + got_offset);
      rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_JMP_SLOT);
      rela.r_addend = 0;
      bfd_elf32_swap_reloca_out (output_bfd, &rela,
                                 ((Elf32_External_Rela *) srela->contents
                                  + plt_index));

      if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
        {
          /* Mark the symbol as undefined, rather than as defined in
             the .plt section.  Leave the value alone.  */
          sym->st_shndx = SHN_UNDEF;
        }
    }

  if (h->got_offset != (bfd_vma) -1)
    {
      asection *sgot;
      asection *srela;
      Elf_Internal_Rela rela;

      /* This symbol has an entry in the global offset table.  Set it
         up.  */

      sgot = bfd_get_section_by_name (dynobj, ".got");
      srela = bfd_get_section_by_name (dynobj, ".rela.got");
      BFD_ASSERT (sgot != NULL && srela != NULL);

      rela.r_offset = (sgot->output_section->vma
                       + sgot->output_offset
                       + (h->got_offset &~ 1));

      /* If this is a -Bsymbolic link, and the symbol is defined
         locally, we just want to emit a RELATIVE reloc.  Likewise if
         the symbol was forced to be local because of a version file.
         The entry in the global offset table will already have been
         initialized in the relocate_section function.  */
      if (info->shared
          && (info->symbolic || h->dynindx == -1)
          && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))
        {
          rela.r_info = ELF32_R_INFO (0, R_68K_RELATIVE);
          rela.r_addend = bfd_get_signed_32 (output_bfd,
                                             (sgot->contents
                                              + (h->got_offset & ~1)));
        }
      else
        {
          bfd_put_32 (output_bfd, (bfd_vma) 0,
                      sgot->contents + (h->got_offset & ~1));
          rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_GLOB_DAT);
          rela.r_addend = 0;
        }

      bfd_elf32_swap_reloca_out (output_bfd, &rela,
                                 ((Elf32_External_Rela *) srela->contents
                                  + srela->reloc_count));
      ++srela->reloc_count;
    }

  if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
    {
      asection *s;
      Elf_Internal_Rela rela;

      /* This symbol needs a copy reloc.  Set it up.  */

      BFD_ASSERT (h->dynindx != -1
                  && (h->root.type == bfd_link_hash_defined
                      || h->root.type == bfd_link_hash_defweak));

      s = bfd_get_section_by_name (h->root.u.def.section->owner,
                                   ".rela.bss");
      BFD_ASSERT (s != NULL);

      rela.r_offset = (h->root.u.def.value
                       + h->root.u.def.section->output_section->vma
                       + h->root.u.def.section->output_offset);
      rela.r_info = ELF32_R_INFO (h->dynindx, R_68K_COPY);
      rela.r_addend = 0;
      bfd_elf32_swap_reloca_out (output_bfd, &rela,
                                 ((Elf32_External_Rela *) s->contents
                                  + s->reloc_count));
      ++s->reloc_count;
    }

  /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.  */
  if (strcmp (h->root.root.string, "_DYNAMIC") == 0
      || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
    sym->st_shndx = SHN_ABS;

  return true;
}

/* Finish up the dynamic sections.  */

static boolean
elf_m68k_finish_dynamic_sections (output_bfd, info)
     bfd *output_bfd;
     struct bfd_link_info *info;
{
  bfd *dynobj;
  asection *sgot;
  asection *sdyn;

  dynobj = elf_hash_table (info)->dynobj;

  sgot = bfd_get_section_by_name (dynobj, ".got.plt");
  BFD_ASSERT (sgot != NULL);
  sdyn = bfd_get_section_by_name (dynobj, ".dynamic");

  if (elf_hash_table (info)->dynamic_sections_created)
    {
      asection *splt;
      Elf32_External_Dyn *dyncon, *dynconend;

      splt = bfd_get_section_by_name (dynobj, ".plt");
      BFD_ASSERT (splt != NULL && sdyn != NULL);

      dyncon = (Elf32_External_Dyn *) sdyn->contents;
      dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
      for (; dyncon < dynconend; dyncon++)
        {
          Elf_Internal_Dyn dyn;
          const char *name;
          asection *s;

          bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);

          switch (dyn.d_tag)
            {
            default:
              break;

            case DT_PLTGOT:
              name = ".got";
              goto get_vma;
            case DT_JMPREL:
              name = ".rela.plt";
            get_vma:
              s = bfd_get_section_by_name (output_bfd, name);
              BFD_ASSERT (s != NULL);
              dyn.d_un.d_ptr = s->vma;
              bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
              break;

            case DT_PLTRELSZ:
              s = bfd_get_section_by_name (output_bfd, ".rela.plt");
              BFD_ASSERT (s != NULL);
              if (s->_cooked_size != 0)
                dyn.d_un.d_val = s->_cooked_size;
              else
                dyn.d_un.d_val = s->_raw_size;
              bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
              break;

            case DT_RELASZ:
              /* The procedure linkage table relocs (DT_JMPREL) should
                 not be included in the overall relocs (DT_RELA).
                 Therefore, we override the DT_RELASZ entry here to
                 make it not include the JMPREL relocs.  Since the
                 linker script arranges for .rela.plt to follow all
                 other relocation sections, we don't have to worry
                 about changing the DT_RELA entry.  */
              s = bfd_get_section_by_name (output_bfd, ".rela.plt");
              if (s != NULL)
                {
                  if (s->_cooked_size != 0)
                    dyn.d_un.d_val -= s->_cooked_size;
                  else
                    dyn.d_un.d_val -= s->_raw_size;
                }
              bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
              break;
            }
        }

      /* Fill in the first entry in the procedure linkage table.  */
      if (splt->_raw_size > 0)
        {
          memcpy (splt->contents, elf_m68k_plt0_entry, PLT_ENTRY_SIZE);
          bfd_put_32 (output_bfd,
                      (sgot->output_section->vma
                       + sgot->output_offset + 4
                       - (splt->output_section->vma + 2)),
                      splt->contents + 4);
          bfd_put_32 (output_bfd,
                      (sgot->output_section->vma
                       + sgot->output_offset + 8
                       - (splt->output_section->vma + 10)),
                      splt->contents + 12);
        }

      elf_section_data (splt->output_section)->this_hdr.sh_entsize
        = PLT_ENTRY_SIZE;
    }

  /* Fill in the first three entries in the global offset table.  */
  if (sgot->_raw_size > 0)
    {
      if (sdyn == NULL)
        bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents);
      else
        bfd_put_32 (output_bfd,
                    sdyn->output_section->vma + sdyn->output_offset,
                    sgot->contents);
      bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 4);
      bfd_put_32 (output_bfd, (bfd_vma) 0, sgot->contents + 8);
    }

  elf_section_data (sgot->output_section)->this_hdr.sh_entsize = 4;

  return true;
}

#define TARGET_BIG_SYM                  bfd_elf32_m68k_vec
#define TARGET_BIG_NAME                 "elf32-m68k"
#define ELF_MACHINE_CODE                EM_68K
#define ELF_MAXPAGESIZE                 0x2000
#define elf_backend_create_dynamic_sections \
                                        _bfd_elf_create_dynamic_sections
#define bfd_elf32_bfd_link_hash_table_create \
                                        elf_m68k_link_hash_table_create
#define elf_backend_check_relocs        elf_m68k_check_relocs
#define elf_backend_adjust_dynamic_symbol \
                                        elf_m68k_adjust_dynamic_symbol
#define elf_backend_size_dynamic_sections \
                                        elf_m68k_size_dynamic_sections
#define elf_backend_relocate_section    elf_m68k_relocate_section
#define elf_backend_finish_dynamic_symbol \
                                        elf_m68k_finish_dynamic_symbol
#define elf_backend_finish_dynamic_sections \
                                        elf_m68k_finish_dynamic_sections
#define elf_backend_want_got_plt 1
#define elf_backend_plt_readonly 1
#define elf_backend_want_plt_sym 0

#include "elf32-target.h"