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/* BFD back-end for Intel 386 COFF files.

   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,

   2000, 2001, 2002, 2003, 2004, 2007

   Free Software Foundation, Inc.

   Written by Cygnus Support.

   This file is part of BFD, the Binary File Descriptor library.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,

   MA 02110-1301, USA.  */

#include "sysdep.h"

#include "bfd.h"

#include "libbfd.h"

#include "coff/i386.h"

#include "coff/internal.h"

#ifdef COFF_WITH_PE

#include "coff/pe.h"

#endif

#ifdef COFF_GO32_EXE

#include "coff/go32exe.h"

#endif

#include "libcoff.h"

static bfd_reloc_status_type coff_i386_reloc

  PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));

static reloc_howto_type *coff_i386_rtype_to_howto

  PARAMS ((bfd *, asection *, struct internal_reloc *,

           struct coff_link_hash_entry *, struct internal_syment *,

           bfd_vma *));

static reloc_howto_type *coff_i386_reloc_type_lookup

  PARAMS ((bfd *, bfd_reloc_code_real_type));

#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (2)

/* The page size is a guess based on ELF.  */

#define COFF_PAGE_SIZE 0x1000

/* For some reason when using i386 COFF the value stored in the .text

   section for a reference to a common symbol is the value itself plus

   any desired offset.  Ian Taylor, Cygnus Support.  */

/* If we are producing relocatable output, we need to do some

   adjustments to the object file that are not done by the

   bfd_perform_relocation function.  This function is called by every

   reloc type to make any required adjustments.  */

static bfd_reloc_status_type

coff_i386_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd,

                 error_message)

     bfd *abfd;

     arelent *reloc_entry;

     asymbol *symbol;

     PTR data;

     asection *input_section ATTRIBUTE_UNUSED;

     bfd *output_bfd;

     char **error_message ATTRIBUTE_UNUSED;

{

  symvalue diff;

#ifndef COFF_WITH_PE

  if (output_bfd == (bfd *) NULL)

    return bfd_reloc_continue;

#endif

  if (bfd_is_com_section (symbol->section))

    {

#ifndef COFF_WITH_PE

      /* We are relocating a common symbol.  The current value in the

         object file is ORIG + OFFSET, where ORIG is the value of the

         common symbol as seen by the object file when it was compiled

         (this may be zero if the symbol was undefined) and OFFSET is

         the offset into the common symbol (normally zero, but may be

         non-zero when referring to a field in a common structure).

         ORIG is the negative of reloc_entry->addend, which is set by

         the CALC_ADDEND macro below.  We want to replace the value in

         the object file with NEW + OFFSET, where NEW is the value of

         the common symbol which we are going to put in the final

         object file.  NEW is symbol->value.  */

      diff = symbol->value + reloc_entry->addend;

#else

      /* In PE mode, we do not offset the common symbol.  */

      diff = reloc_entry->addend;

#endif

    }

  else

    {

      /* For some reason bfd_perform_relocation always effectively

         ignores the addend for a COFF target when producing

         relocatable output.  This seems to be always wrong for 386

         COFF, so we handle the addend here instead.  */

#ifdef COFF_WITH_PE

      if (output_bfd == (bfd *) NULL)

        {

          reloc_howto_type *howto = reloc_entry->howto;

          /* Although PC relative relocations are very similar between

             PE and non-PE formats, but they are off by 1 << howto->size

             bytes. For the external relocation, PE is very different

             from others. See md_apply_fix3 () in gas/config/tc-i386.c.

             When we link PE and non-PE object files together to

             generate a non-PE executable, we have to compensate it

             here.  */

          if (howto->pc_relative && howto->pcrel_offset)

            diff = -(1 << howto->size);

          else if (symbol->flags & BSF_WEAK)

            diff = reloc_entry->addend - symbol->value;

          else

            diff = -reloc_entry->addend;

        }

      else

#endif

        diff = reloc_entry->addend;

    }

#ifdef COFF_WITH_PE

  /* FIXME: How should this case be handled?  */

  if (reloc_entry->howto->type == R_IMAGEBASE

      && output_bfd != NULL

      && bfd_get_flavour(output_bfd) == bfd_target_coff_flavour)

    diff -= pe_data (output_bfd)->pe_opthdr.ImageBase;

#endif

#define DOIT(x) \

  x = ((x & ~howto->dst_mask) | (((x & howto->src_mask) + diff) & howto->dst_mask))

    if (diff != 0)

      {

        reloc_howto_type *howto = reloc_entry->howto;

        unsigned char *addr = (unsigned char *) data + reloc_entry->address;

        switch (howto->size)

          {

          case 0:

            {

              char x = bfd_get_8 (abfd, addr);

              DOIT (x);

              bfd_put_8 (abfd, x, addr);

            }

            break;

          case 1:

            {

              short x = bfd_get_16 (abfd, addr);

              DOIT (x);

              bfd_put_16 (abfd, (bfd_vma) x, addr);

            }

            break;

          case 2:

            {

              long x = bfd_get_32 (abfd, addr);

              DOIT (x);

              bfd_put_32 (abfd, (bfd_vma) x, addr);

            }

            break;

          default:

            abort ();

          }

      }

  /* Now let bfd_perform_relocation finish everything up.  */

  return bfd_reloc_continue;

}

#ifdef COFF_WITH_PE

/* Return TRUE if this relocation should appear in the output .reloc

   section.  */

static bfd_boolean in_reloc_p PARAMS ((bfd *, reloc_howto_type *));

static bfd_boolean in_reloc_p (abfd, howto)

     bfd * abfd ATTRIBUTE_UNUSED;

     reloc_howto_type *howto;

{

  return ! howto->pc_relative && howto->type != R_IMAGEBASE;

}

#endif /* COFF_WITH_PE */

#ifndef PCRELOFFSET

#define PCRELOFFSET FALSE

#endif

static reloc_howto_type howto_table[] =

{

  EMPTY_HOWTO (0),

  EMPTY_HOWTO (1),

  EMPTY_HOWTO (2),

  EMPTY_HOWTO (3),

  EMPTY_HOWTO (4),

  EMPTY_HOWTO (5),

  HOWTO (R_DIR32,               /* type */

         0,                      /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         32,                    /* bitsize */

         FALSE,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         coff_i386_reloc,       /* special_function */

         "dir32",               /* name */

         TRUE,                  /* partial_inplace */

         0xffffffff,            /* src_mask */

         0xffffffff,            /* dst_mask */

         TRUE),                 /* pcrel_offset */

  /* PE IMAGE_REL_I386_DIR32NB relocation (7).  */

  HOWTO (R_IMAGEBASE,           /* type */

         0,                      /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         32,                    /* bitsize */

         FALSE,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         coff_i386_reloc,       /* special_function */

         "rva32",               /* name */

         TRUE,                  /* partial_inplace */

         0xffffffff,            /* src_mask */

         0xffffffff,            /* dst_mask */

         FALSE),                /* pcrel_offset */

  EMPTY_HOWTO (010),

  EMPTY_HOWTO (011),

  EMPTY_HOWTO (012),

#ifdef COFF_WITH_PE

  /* 32-bit longword section relative relocation (013).  */

  HOWTO (R_SECREL32,            /* type */

         0,                      /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         32,                    /* bitsize */

         FALSE,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         coff_i386_reloc,       /* special_function */

         "secrel32",            /* name */

         TRUE,                  /* partial_inplace */

         0xffffffff,            /* src_mask */

         0xffffffff,            /* dst_mask */

         TRUE),                 /* pcrel_offset */

#else

  EMPTY_HOWTO (013),

#endif

  EMPTY_HOWTO (014),

  EMPTY_HOWTO (015),

  EMPTY_HOWTO (016),

  /* Byte relocation (017).  */

  HOWTO (R_RELBYTE,             /* type */

         0,                      /* rightshift */

         0,                      /* size (0 = byte, 1 = short, 2 = long) */

         8,                     /* bitsize */

         FALSE,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         coff_i386_reloc,       /* special_function */

         "8",                   /* name */

         TRUE,                  /* partial_inplace */

         0x000000ff,            /* src_mask */

         0x000000ff,            /* dst_mask */

         PCRELOFFSET),          /* pcrel_offset */

  /* 16-bit word relocation (020).  */

  HOWTO (R_RELWORD,             /* type */

         0,                      /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         16,                    /* bitsize */

         FALSE,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         coff_i386_reloc,       /* special_function */

         "16",                  /* name */

         TRUE,                  /* partial_inplace */

         0x0000ffff,            /* src_mask */

         0x0000ffff,            /* dst_mask */

         PCRELOFFSET),          /* pcrel_offset */

  /* 32-bit longword relocation (021).  */

  HOWTO (R_RELLONG,             /* type */

         0,                      /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         32,                    /* bitsize */

         FALSE,                 /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_bitfield, /* complain_on_overflow */

         coff_i386_reloc,       /* special_function */

         "32",                  /* name */

         TRUE,                  /* partial_inplace */

         0xffffffff,            /* src_mask */

         0xffffffff,            /* dst_mask */

         PCRELOFFSET),          /* pcrel_offset */

  /* Byte PC relative relocation (022).  */

  HOWTO (R_PCRBYTE,             /* type */

         0,                      /* rightshift */

         0,                      /* size (0 = byte, 1 = short, 2 = long) */

         8,                     /* bitsize */

         TRUE,                  /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         coff_i386_reloc,       /* special_function */

         "DISP8",               /* name */

         TRUE,                  /* partial_inplace */

         0x000000ff,            /* src_mask */

         0x000000ff,            /* dst_mask */

         PCRELOFFSET),          /* pcrel_offset */

  /* 16-bit word PC relative relocation (023).  */

  HOWTO (R_PCRWORD,             /* type */

         0,                      /* rightshift */

         1,                     /* size (0 = byte, 1 = short, 2 = long) */

         16,                    /* bitsize */

         TRUE,                  /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         coff_i386_reloc,       /* special_function */

         "DISP16",              /* name */

         TRUE,                  /* partial_inplace */

         0x0000ffff,            /* src_mask */

         0x0000ffff,            /* dst_mask */

         PCRELOFFSET),          /* pcrel_offset */

  /* 32-bit longword PC relative relocation (024).  */

  HOWTO (R_PCRLONG,             /* type */

         0,                      /* rightshift */

         2,                     /* size (0 = byte, 1 = short, 2 = long) */

         32,                    /* bitsize */

         TRUE,                  /* pc_relative */

         0,                      /* bitpos */

         complain_overflow_signed, /* complain_on_overflow */

         coff_i386_reloc,       /* special_function */

         "DISP32",              /* name */

         TRUE,                  /* partial_inplace */

         0xffffffff,            /* src_mask */

         0xffffffff,            /* dst_mask */

         PCRELOFFSET)           /* pcrel_offset */

};

/* Turn a howto into a reloc  nunmber */

#define SELECT_RELOC(x,howto) { x.r_type = howto->type; }

#define BADMAG(x) I386BADMAG(x)

#define I386 1                  /* Customize coffcode.h */

#define RTYPE2HOWTO(cache_ptr, dst)                                     \

  ((cache_ptr)->howto =                                                 \

   ((dst)->r_type < sizeof (howto_table) / sizeof (howto_table[0])       \

    ? howto_table + (dst)->r_type                                       \

    : NULL))

/* For 386 COFF a STYP_NOLOAD | STYP_BSS section is part of a shared

   library.  On some other COFF targets STYP_BSS is normally

   STYP_NOLOAD.  */

#define BSS_NOLOAD_IS_SHARED_LIBRARY

/* Compute the addend of a reloc.  If the reloc is to a common symbol,

   the object file contains the value of the common symbol.  By the

   time this is called, the linker may be using a different symbol

   from a different object file with a different value.  Therefore, we

   hack wildly to locate the original symbol from this file so that we

   can make the correct adjustment.  This macro sets coffsym to the

   symbol from the original file, and uses it to set the addend value

   correctly.  If this is not a common symbol, the usual addend

   calculation is done, except that an additional tweak is needed for

   PC relative relocs.

   FIXME: This macro refers to symbols and asect; these are from the

   calling function, not the macro arguments.  */

#define CALC_ADDEND(abfd, ptr, reloc, cache_ptr)                \

  {                                                             \

    coff_symbol_type *coffsym = (coff_symbol_type *) NULL;      \

    if (ptr && bfd_asymbol_bfd (ptr) != abfd)                   \

      coffsym = (obj_symbols (abfd)                             \

                 + (cache_ptr->sym_ptr_ptr - symbols));         \

    else if (ptr)                                               \

      coffsym = coff_symbol_from (abfd, ptr);                   \

    if (coffsym != (coff_symbol_type *) NULL                    \

        && coffsym->native->u.syment.n_scnum == 0)               \

      cache_ptr->addend = - coffsym->native->u.syment.n_value;  \

    else if (ptr && bfd_asymbol_bfd (ptr) == abfd               \

             && ptr->section != (asection *) NULL)              \

      cache_ptr->addend = - (ptr->section->vma + ptr->value);   \

    else                                                        \

      cache_ptr->addend = 0;                                     \

    if (ptr && howto_table[reloc.r_type].pc_relative)           \

      cache_ptr->addend += asect->vma;                          \

  }

/* We use the special COFF backend linker.  For normal i386 COFF, we

   can use the generic relocate_section routine.  For PE, we need our

   own routine.  */

#ifndef COFF_WITH_PE

#define coff_relocate_section _bfd_coff_generic_relocate_section

#else /* COFF_WITH_PE */

/* The PE relocate section routine.  The only difference between this

   and the regular routine is that we don't want to do anything for a

   relocatable link.  */

static bfd_boolean coff_pe_i386_relocate_section

  PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,

           struct internal_reloc *, struct internal_syment *, asection **));

static bfd_boolean

coff_pe_i386_relocate_section (output_bfd, info, input_bfd,

                               input_section, contents, relocs, syms,

                               sections)

     bfd *output_bfd;

     struct bfd_link_info *info;

     bfd *input_bfd;

     asection *input_section;

     bfd_byte *contents;

     struct internal_reloc *relocs;

     struct internal_syment *syms;

     asection **sections;

{

  if (info->relocatable)

    return TRUE;

  return _bfd_coff_generic_relocate_section (output_bfd, info, input_bfd,

                                             input_section, contents,

                                             relocs, syms, sections);

}

#define coff_relocate_section coff_pe_i386_relocate_section

#endif /* COFF_WITH_PE */

/* Convert an rtype to howto for the COFF backend linker.  */

static reloc_howto_type *

coff_i386_rtype_to_howto (abfd, sec, rel, h, sym, addendp)

     bfd *abfd ATTRIBUTE_UNUSED;

     asection *sec;

     struct internal_reloc *rel;

     struct coff_link_hash_entry *h;

     struct internal_syment *sym;

     bfd_vma *addendp;

{

  reloc_howto_type *howto;

  if (rel->r_type >= sizeof (howto_table) / sizeof (howto_table[0]))

    {

      bfd_set_error (bfd_error_bad_value);

      return NULL;

    }

  howto = howto_table + rel->r_type;

#ifdef COFF_WITH_PE

  /* Cancel out code in _bfd_coff_generic_relocate_section.  */

  *addendp = 0;

#endif

  if (howto->pc_relative)

    *addendp += sec->vma;

  if (sym != NULL && sym->n_scnum == 0 && sym->n_value != 0)

    {

      /* This is a common symbol.  The section contents include the

         size (sym->n_value) as an addend.  The relocate_section

         function will be adding in the final value of the symbol.  We

         need to subtract out the current size in order to get the

         correct result.  */

      BFD_ASSERT (h != NULL);

#ifndef COFF_WITH_PE

      /* I think we *do* want to bypass this.  If we don't, I have

         seen some data parameters get the wrong relocation address.

         If I link two versions with and without this section bypassed

         and then do a binary comparison, the addresses which are

         different can be looked up in the map.  The case in which

         this section has been bypassed has addresses which correspond

         to values I can find in the map.  */

      *addendp -= sym->n_value;

#endif

    }

#ifndef COFF_WITH_PE

  /* If the output symbol is common (in which case this must be a

     relocatable link), we need to add in the final size of the

     common symbol.  */

  if (h != NULL && h->root.type == bfd_link_hash_common)

    *addendp += h->root.u.c.size;

#endif

#ifdef COFF_WITH_PE

  if (howto->pc_relative)

    {

      *addendp -= 4;

      /* If the symbol is defined, then the generic code is going to

         add back the symbol value in order to cancel out an

         adjustment it made to the addend.  However, we set the addend

         to 0 at the start of this function.  We need to adjust here,

         to avoid the adjustment the generic code will make.  FIXME:

         This is getting a bit hackish.  */

      if (sym != NULL && sym->n_scnum != 0)

        *addendp -= sym->n_value;

    }

  if (rel->r_type == R_IMAGEBASE

      && (bfd_get_flavour(sec->output_section->owner)

          == bfd_target_coff_flavour))

    {

      *addendp -= pe_data(sec->output_section->owner)->pe_opthdr.ImageBase;

    }

  BFD_ASSERT (sym != NULL);

  if (rel->r_type == R_SECREL32 && sym != NULL)

    {

      bfd_vma osect_vma;

      if (h && (h->type == bfd_link_hash_defined

                || h->type == bfd_link_hash_defweak))

        osect_vma = h->root.u.def.section->output_section->vma;

      else

        {

          asection *sec;

          int i;

          /* Sigh, the only way to get the section to offset against

             is to find it the hard way.  */

          for (sec = abfd->sections, i = 1; i < sym->n_scnum; i++)

            sec = sec->next;

          osect_vma = sec->output_section->vma;

        }

      *addendp -= osect_vma;

    }

#endif

  return howto;

}

#define coff_bfd_reloc_type_lookup coff_i386_reloc_type_lookup

#define coff_bfd_reloc_name_lookup coff_i386_reloc_name_lookup

static reloc_howto_type *

coff_i386_reloc_type_lookup (abfd, code)

     bfd *abfd ATTRIBUTE_UNUSED;

     bfd_reloc_code_real_type code;

{

  switch (code)

    {

    case BFD_RELOC_RVA:

      return howto_table + R_IMAGEBASE;

    case BFD_RELOC_32:

      return howto_table + R_DIR32;

    case BFD_RELOC_32_PCREL:

      return howto_table + R_PCRLONG;

    case BFD_RELOC_16:

      return howto_table + R_RELWORD;

    case BFD_RELOC_16_PCREL:

      return howto_table + R_PCRWORD;

    case BFD_RELOC_8:

      return howto_table + R_RELBYTE;

    case BFD_RELOC_8_PCREL:

      return howto_table + R_PCRBYTE;

#ifdef COFF_WITH_PE

    case BFD_RELOC_32_SECREL:

      return howto_table + R_SECREL32;

#endif

    default:

      BFD_FAIL ();

      return 0;

    }

}

static reloc_howto_type *

coff_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,

                             const char *r_name)

{

  unsigned int i;

  for (i = 0; i < sizeof (howto_table) / sizeof (howto_table[0]); i++)

    if (howto_table[i].name != NULL

        && strcasecmp (howto_table[i].name, r_name) == 0)

      return &howto_table[i];

  return NULL;

}

#define coff_rtype_to_howto coff_i386_rtype_to_howto

#ifdef TARGET_UNDERSCORE

/* If i386 gcc uses underscores for symbol names, then it does not use

   a leading dot for local labels, so if TARGET_UNDERSCORE is defined

   we treat all symbols starting with L as local.  */

static bfd_boolean coff_i386_is_local_label_name

  PARAMS ((bfd *, const char *));

static bfd_boolean

coff_i386_is_local_label_name (abfd, name)

     bfd *abfd;

     const char *name;

{

  if (name[0] == 'L')

    return TRUE;

  return _bfd_coff_is_local_label_name (abfd, name);

}

#define coff_bfd_is_local_label_name coff_i386_is_local_label_name

#endif /* TARGET_UNDERSCORE */

#include "coffcode.h"

const bfd_target

#ifdef TARGET_SYM

  TARGET_SYM =

#else

  i386coff_vec =

#endif

{

#ifdef TARGET_NAME

  TARGET_NAME,

#else

  "coff-i386",                  /* name */

#endif

  bfd_target_coff_flavour,

  BFD_ENDIAN_LITTLE,            /* data byte order is little */

  BFD_ENDIAN_LITTLE,            /* header byte order is little */

  (HAS_RELOC | EXEC_P |         /* object flags */

   HAS_LINENO | HAS_DEBUG |

   HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),

  (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC /* section flags */

#ifdef COFF_WITH_PE

   | SEC_LINK_ONCE | SEC_LINK_DUPLICATES | SEC_READONLY

#endif

   | SEC_CODE | SEC_DATA),

#ifdef TARGET_UNDERSCORE

  TARGET_UNDERSCORE,            /* leading underscore */

#else

  0,                             /* leading underscore */

#endif

  '/',                          /* ar_pad_char */

  15,                           /* ar_max_namelen */

  bfd_getl64, bfd_getl_signed_64, bfd_putl64,

     bfd_getl32, bfd_getl_signed_32, bfd_putl32,

     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */

  bfd_getl64, bfd_getl_signed_64, bfd_putl64,

     bfd_getl32, bfd_getl_signed_32, bfd_putl32,

     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */

/* Note that we allow an object file to be treated as a core file as well.  */

    {_bfd_dummy_target, coff_object_p, /* bfd_check_format */

       bfd_generic_archive_p, coff_object_p},

    {bfd_false, coff_mkobject, _bfd_generic_mkarchive, /* bfd_set_format */

       bfd_false},

    {bfd_false, coff_write_object_contents, /* bfd_write_contents */

       _bfd_write_archive_contents, bfd_false},

     BFD_JUMP_TABLE_GENERIC (coff),

     BFD_JUMP_TABLE_COPY (coff),

     BFD_JUMP_TABLE_CORE (_bfd_nocore),

     BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_coff),

     BFD_JUMP_TABLE_SYMBOLS (coff),

     BFD_JUMP_TABLE_RELOCS (coff),

     BFD_JUMP_TABLE_WRITE (coff),

     BFD_JUMP_TABLE_LINK (coff),

     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),

  NULL,

  COFF_SWAP_TABLE

};