Subversion Repositories openrisc_2011-10-31

/* BFD back-end for TMS320C30 a.out binaries.

   Copyright 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2009

   Free Software Foundation, Inc.

   Contributed by Steven Haworth (steve@pm.cse.rmit.edu.au)

   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.  */

#define TARGET_IS_BIG_ENDIAN_P

#define N_HEADER_IN_TEXT(x)     1

#define TEXT_START_ADDR         1024

#define TARGET_PAGE_SIZE        128

#define SEGMENT_SIZE            TARGET_PAGE_SIZE

#define DEFAULT_ARCH            bfd_arch_tic30

#define ARCH_SIZE 32

/* Do not "beautify" the CONCAT* macro args.  Traditional C will not

   remove whitespace added here, and thus will fail to concatenate

   the tokens.  */

#define MY(OP) CONCAT2 (tic30_aout_,OP)

#define TARGETNAME "a.out-tic30"

#define NAME(x,y) CONCAT3 (tic30_aout,_32_,y)

#include "sysdep.h"

#include "bfd.h"

#include "libaout.h"

#include "aout/aout64.h"

#include "aout/stab_gnu.h"

#include "aout/ar.h"

#define MY_reloc_howto(BFD, REL, IN, EX, PC)   tic30_aout_reloc_howto (BFD, REL, & IN, & EX, & PC)

#define MY_final_link_relocate    tic30_aout_final_link_relocate

#define MY_object_p               tic30_aout_object_p

#define MY_mkobject               NAME (aout,mkobject)

#define MY_write_object_contents  tic30_aout_write_object_contents

#define MY_set_sizes              tic30_aout_set_sizes

#ifndef MY_exec_hdr_flags

#define MY_exec_hdr_flags 1

#endif

#ifndef MY_backend_data

#ifndef MY_zmagic_contiguous

#define MY_zmagic_contiguous 0

#endif

#ifndef MY_text_includes_header

#define MY_text_includes_header 0

#endif

#ifndef MY_entry_is_text_address

#define MY_entry_is_text_address 0

#endif

#ifndef MY_exec_header_not_counted

#define MY_exec_header_not_counted 1

#endif

#ifndef MY_add_dynamic_symbols

#define MY_add_dynamic_symbols 0

#endif

#ifndef MY_add_one_symbol

#define MY_add_one_symbol 0

#endif

#ifndef MY_link_dynamic_object

#define MY_link_dynamic_object 0

#endif

#ifndef MY_write_dynamic_symbol

#define MY_write_dynamic_symbol 0

#endif

#ifndef MY_check_dynamic_reloc

#define MY_check_dynamic_reloc 0

#endif

#ifndef MY_finish_dynamic_link

#define MY_finish_dynamic_link 0

#endif

static bfd_boolean

tic30_aout_set_sizes (bfd *abfd)

{

  adata (abfd).page_size = TARGET_PAGE_SIZE;

#ifdef SEGMENT_SIZE

  adata (abfd).segment_size = SEGMENT_SIZE;

#else

  adata (abfd).segment_size = TARGET_PAGE_SIZE;

#endif

#ifdef ZMAGIC_DISK_BLOCK_SIZE

  adata (abfd).zmagic_disk_block_size = ZMAGIC_DISK_BLOCK_SIZE;

#else

  adata (abfd).zmagic_disk_block_size = TARGET_PAGE_SIZE;

#endif

  adata (abfd).exec_bytes_size = EXEC_BYTES_SIZE;

  return TRUE;

}

static const struct aout_backend_data tic30_aout_backend_data =

{

  MY_zmagic_contiguous,

  MY_text_includes_header,

  MY_entry_is_text_address,

  MY_exec_hdr_flags,

  0,                             /* Text vma?  */

  MY_set_sizes,

  MY_exec_header_not_counted,

  MY_add_dynamic_symbols,

  MY_add_one_symbol,

  MY_link_dynamic_object,

  MY_write_dynamic_symbol,

  MY_check_dynamic_reloc,

  MY_finish_dynamic_link

};

#define MY_backend_data &tic30_aout_backend_data

#endif

static reloc_howto_type *

  tic30_aout_reloc_howto (bfd *, struct reloc_std_external *, int *, int *, int *);

static bfd_reloc_status_type

  tic30_aout_final_link_relocate

    (reloc_howto_type *, bfd *, asection *, bfd_byte *, bfd_vma, bfd_vma, bfd_vma);

/* FIXME: This is wrong.  aoutx.h should really only be included by

   aout32.c.  */

#include "aoutx.h"

/* This function is used to work out pc-relative offsets for the

   TMS320C30.  The data already placed by md_pcrel_from within gas is

   useless for a relocation, so we just get the offset value and place

   a version of this within the object code.

   tic30_aout_final_link_relocate will then calculate the required

   relocation to add on to the value in the object code.  */

static bfd_reloc_status_type

tic30_aout_fix_pcrel_16 (bfd *abfd,

                         arelent *reloc_entry,

                         asymbol *symbol ATTRIBUTE_UNUSED,

                         void * data,

                         asection *input_section ATTRIBUTE_UNUSED,

                         bfd *output_bfd ATTRIBUTE_UNUSED,

                         char **error_message ATTRIBUTE_UNUSED)

{

  bfd_vma relocation = 1;

  bfd_byte offset_data = bfd_get_8 (abfd, (bfd_byte *) data + reloc_entry->address - 1);

  /* The byte before the location of the fix contains bits 23-16 of

     the pcrel instruction.  Bit 21 is set for a delayed instruction

     which requires on offset of 3 instead of 1.  */

  if (offset_data & 0x20)

    relocation -= 3;

  else

    relocation -= 1;

  bfd_put_16 (abfd, relocation, (bfd_byte *) data + reloc_entry->address);

  return bfd_reloc_ok;

}

/* This function is used as a callback for 16-bit relocs.  This is

   required for relocations between segments.  A line in aoutx.h

   requires that any relocations for the data section should point to

   the end of the aligned text section, plus an offset.  By default,

   this does not happen, therefore this function takes care of

   that.  */

static bfd_reloc_status_type

tic30_aout_fix_16 (bfd *abfd,

                   arelent *reloc_entry,

                   asymbol *symbol,

                   void * data,

                   asection *input_section ATTRIBUTE_UNUSED,

                   bfd *output_bfd,

                   char **error_message ATTRIBUTE_UNUSED)

{

  bfd_vma relocation;

  /* Make sure that the symbol's section is defined.  */

  if (symbol->section == &bfd_und_section && (symbol->flags & BSF_WEAK) == 0)

    return output_bfd ? bfd_reloc_ok : bfd_reloc_undefined;

  /* Get the size of the input section and turn it into the TMS320C30

     32-bit address format.  */

  relocation = (symbol->section->vma >> 2);

  relocation += bfd_get_16 (abfd, (bfd_byte *) data + reloc_entry->address);

  bfd_put_16 (abfd, relocation, (bfd_byte *) data + reloc_entry->address);

  return bfd_reloc_ok;

}

/* This function does the same thing as tic30_aout_fix_16 except for 32

   bit relocations.  */

static bfd_reloc_status_type

tic30_aout_fix_32 (bfd *abfd,

                   arelent *reloc_entry,

                   asymbol *symbol,

                   void * data,

                   asection *input_section ATTRIBUTE_UNUSED,

                   bfd *output_bfd,

                   char **error_message ATTRIBUTE_UNUSED)

{

  bfd_vma relocation;

  /* Make sure that the symbol's section is defined.  */

  if (symbol->section == &bfd_und_section && (symbol->flags & BSF_WEAK) == 0)

    return output_bfd ? bfd_reloc_ok : bfd_reloc_undefined;

  /* Get the size of the input section and turn it into the TMS320C30

     32-bit address format.  */

  relocation = (symbol->section->vma >> 2);

  relocation += bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);

  bfd_put_32 (abfd, relocation, (bfd_byte *) data + reloc_entry->address);

  return bfd_reloc_ok;

}

/* This table lists the relocation types for the TMS320C30.  There are

   only a few relocations required, and all must be divided by 4 (>>

   2) to get the 32-bit addresses in the format the TMS320C30 likes

   it.  */

reloc_howto_type tic30_aout_howto_table[] =

{

  EMPTY_HOWTO (-1),

  HOWTO (1, 2, 1, 16, FALSE, 0, 0, tic30_aout_fix_16,

         "16", FALSE, 0x0000FFFF, 0x0000FFFF, FALSE),

  HOWTO (2, 2, 2, 24, FALSE, 0, complain_overflow_bitfield, NULL,

         "24", FALSE, 0x00FFFFFF, 0x00FFFFFF, FALSE),

  HOWTO (3, 18, 3, 24, FALSE, 0, complain_overflow_bitfield, NULL,

         "LDP", FALSE, 0x00FF0000, 0x000000FF, FALSE),

  HOWTO (4, 2, 4, 32, FALSE, 0, complain_overflow_bitfield, tic30_aout_fix_32,

         "32", FALSE, 0xFFFFFFFF, 0xFFFFFFFF, FALSE),

  HOWTO (5, 2, 1, 16, TRUE, 0, complain_overflow_signed,

         tic30_aout_fix_pcrel_16, "PCREL", TRUE, 0x0000FFFF, 0x0000FFFF, TRUE),

  EMPTY_HOWTO (-1),

  EMPTY_HOWTO (-1),

  EMPTY_HOWTO (-1),

  EMPTY_HOWTO (-1),

  EMPTY_HOWTO (-1)

};

static reloc_howto_type *

tic30_aout_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,

                              bfd_reloc_code_real_type code)

{

  switch (code)

    {

    case BFD_RELOC_8:

    case BFD_RELOC_TIC30_LDP:

      return &tic30_aout_howto_table[3];

    case BFD_RELOC_16:

      return &tic30_aout_howto_table[1];

    case BFD_RELOC_24:

      return &tic30_aout_howto_table[2];

    case BFD_RELOC_16_PCREL:

      return &tic30_aout_howto_table[5];

    case BFD_RELOC_32:

      return &tic30_aout_howto_table[4];

    default:

      return NULL;

    }

}

static reloc_howto_type *

tic30_aout_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,

                              const char *r_name)

{

  unsigned int i;

  for (i = 0;

       i < (sizeof (tic30_aout_howto_table)

            / sizeof (tic30_aout_howto_table[0]));

       i++)

    if (tic30_aout_howto_table[i].name != NULL

        && strcasecmp (tic30_aout_howto_table[i].name, r_name) == 0)

      return &tic30_aout_howto_table[i];

  return NULL;

}

static reloc_howto_type *

tic30_aout_reloc_howto (bfd *abfd,

                        struct reloc_std_external *relocs,

                        int *r_index,

                        int *r_extern,

                        int *r_pcrel)

{

  unsigned int r_length;

  unsigned int r_pcrel_done;

  int howto_index;

  *r_pcrel = 0;

  if (bfd_header_big_endian (abfd))

    {

      *r_index = ((relocs->r_index[0] << 16) | (relocs->r_index[1] << 8) | relocs->r_index[2]);

      *r_extern = (0 != (relocs->r_type[0] & RELOC_STD_BITS_EXTERN_BIG));

      r_pcrel_done = (0 != (relocs->r_type[0] & RELOC_STD_BITS_PCREL_BIG));

      r_length = ((relocs->r_type[0] & RELOC_STD_BITS_LENGTH_BIG) >> RELOC_STD_BITS_LENGTH_SH_BIG);

    }

  else

    {

      *r_index = ((relocs->r_index[2] << 16) | (relocs->r_index[1] << 8) | relocs->r_index[0]);

      *r_extern = (0 != (relocs->r_type[0] & RELOC_STD_BITS_EXTERN_LITTLE));

      r_pcrel_done = (0 != (relocs->r_type[0] & RELOC_STD_BITS_PCREL_LITTLE));

      r_length = ((relocs->r_type[0] & RELOC_STD_BITS_LENGTH_LITTLE) >> RELOC_STD_BITS_LENGTH_SH_LITTLE);

    }

  howto_index = r_length + 4 * r_pcrel_done;

  return tic30_aout_howto_table + howto_index;

}

/* These macros will get 24-bit values from the bfd definition.

   Big-endian only.  */

#define bfd_getb_24(BFD,ADDR)                   \

 (bfd_get_8 (BFD, ADDR    ) << 16) |            \

 (bfd_get_8 (BFD, ADDR + 1) <<  8) |            \

 (bfd_get_8 (BFD, ADDR + 2)      )

#define bfd_putb_24(BFD,DATA,ADDR)                              \

 bfd_put_8 (BFD, (bfd_byte) ((DATA >> 16) & 0xFF), ADDR    );   \

 bfd_put_8 (BFD, (bfd_byte) ((DATA >>  8) & 0xFF), ADDR + 1);   \

 bfd_put_8 (BFD, (bfd_byte) ( DATA        & 0xFF), ADDR + 2)

/* Set parameters about this a.out file that are machine-dependent.

   This routine is called from some_aout_object_p just before it returns.  */

static const bfd_target *

tic30_aout_callback (bfd *abfd)

{

  struct internal_exec *execp = exec_hdr (abfd);

  unsigned int arch_align_power;

  unsigned long arch_align;

  /* Calculate the file positions of the parts of a newly read aout header.  */

  obj_textsec (abfd)->size = N_TXTSIZE (*execp);

  /* The virtual memory addresses of the sections.  */

  obj_textsec (abfd)->vma = N_TXTADDR (*execp);

  obj_datasec (abfd)->vma = N_DATADDR (*execp);

  obj_bsssec (abfd)->vma = N_BSSADDR (*execp);

  obj_textsec (abfd)->lma = obj_textsec (abfd)->vma;

  obj_datasec (abfd)->lma = obj_datasec (abfd)->vma;

  obj_bsssec (abfd)->lma = obj_bsssec (abfd)->vma;

  /* The file offsets of the sections.  */

  obj_textsec (abfd)->filepos = N_TXTOFF (*execp);

  obj_datasec (abfd)->filepos = N_DATOFF (*execp);

  /* The file offsets of the relocation info.  */

  obj_textsec (abfd)->rel_filepos = N_TRELOFF (*execp);

  obj_datasec (abfd)->rel_filepos = N_DRELOFF (*execp);

  /* The file offsets of the string table and symbol table.  */

  obj_sym_filepos (abfd) = N_SYMOFF (*execp);

  obj_str_filepos (abfd) = N_STROFF (*execp);

  /* Determine the architecture and machine type of the object file.  */

#ifdef SET_ARCH_MACH

  SET_ARCH_MACH (abfd, *execp);

#else

  bfd_default_set_arch_mach (abfd, DEFAULT_ARCH, 0L);

#endif

  /* Now that we know the architecture, set the alignments of the

     sections.  This is normally done by NAME (aout,new_section_hook),

     but when the initial sections were created the architecture had

     not yet been set.  However, for backward compatibility, we don't

     set the alignment power any higher than as required by the size

     of the section.  */

  arch_align_power = bfd_get_arch_info (abfd)->section_align_power;

  arch_align = 1 << arch_align_power;

  if ((BFD_ALIGN (obj_textsec (abfd)->size, arch_align)

       == obj_textsec (abfd)->size)

      && (BFD_ALIGN (obj_datasec (abfd)->size, arch_align)

          == obj_datasec (abfd)->size)

      && (BFD_ALIGN (obj_bsssec (abfd)->size, arch_align)

          == obj_bsssec (abfd)->size))

    {

      obj_textsec (abfd)->alignment_power = arch_align_power;

      obj_datasec (abfd)->alignment_power = arch_align_power;

      obj_bsssec (abfd)->alignment_power = arch_align_power;

    }

  return abfd->xvec;

}

static bfd_reloc_status_type

tic30_aout_relocate_contents (reloc_howto_type *howto,

                              bfd *input_bfd,

                              bfd_vma relocation,

                              bfd_byte *location)

{

  bfd_vma x;

  bfd_boolean overflow;

  if (howto->size < 0)

    relocation = -relocation;

  switch (howto->size)

    {

    default:

    case 0:

      abort ();

      break;

    case 1:

      x = bfd_get_16 (input_bfd, location);

      break;

    case 2:

      x = bfd_getb_24 (input_bfd, location);

      break;

    case 3:

      x = bfd_get_8 (input_bfd, location);

      break;

    case 4:

      x = bfd_get_32 (input_bfd, location);

      break;

    }

  overflow = FALSE;

  if (howto->complain_on_overflow != complain_overflow_dont)

    {

      bfd_vma check;

      bfd_signed_vma signed_check;

      bfd_vma add;

      bfd_signed_vma signed_add;

      if (howto->rightshift == 0)

        {

          check = relocation;

          signed_check = (bfd_signed_vma) relocation;

        }

      else

        {

          check = relocation >> howto->rightshift;

          if ((bfd_signed_vma) relocation >= 0)

            signed_check = check;

          else

            signed_check = (check | ((bfd_vma) - 1 & ~((bfd_vma) - 1 >> howto->rightshift)));

        }

      add = x & howto->src_mask;

      signed_add = add;

      if ((add & (((~howto->src_mask) >> 1) & howto->src_mask)) != 0)

        signed_add -= (((~howto->src_mask) >> 1) & howto->src_mask) << 1;

      if (howto->bitpos == 0)

        {

          check += add;

          signed_check += signed_add;

        }

      else

        {

          check += add >> howto->bitpos;

          if (signed_add >= 0)

            signed_check += add >> howto->bitpos;

          else

            signed_check += ((add >> howto->bitpos) | ((bfd_vma) - 1 & ~((bfd_vma) - 1 >> howto->bitpos)));

        }

      switch (howto->complain_on_overflow)

        {

        case complain_overflow_signed:

          {

            bfd_signed_vma reloc_signed_max = (1 << (howto->bitsize - 1)) - 1;

            bfd_signed_vma reloc_signed_min = ~reloc_signed_max;

            if (signed_check > reloc_signed_max || signed_check < reloc_signed_min)

              overflow = TRUE;

          }

          break;

        case complain_overflow_unsigned:

          {

            bfd_vma reloc_unsigned_max = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;

            if (check > reloc_unsigned_max)

              overflow = TRUE;

          }

          break;

        case complain_overflow_bitfield:

          {

            bfd_vma reloc_bits = (((1 << (howto->bitsize - 1)) - 1) << 1) | 1;

            if ((check & ~reloc_bits) != 0

                && (((bfd_vma) signed_check & ~reloc_bits)

                    != ((bfd_vma) -1 & ~reloc_bits)))

              overflow = TRUE;

          }

          break;

        default:

          abort ();

        }

    }

  relocation >>= (bfd_vma) howto->rightshift;

  relocation <<= (bfd_vma) howto->bitpos;

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

  switch (howto->size)

    {

    default:

    case 0:

      abort ();

      break;

    case 1:

      bfd_put_16 (input_bfd, x, location);

      break;

    case 2:

      bfd_putb_24 (input_bfd, x, location);

      break;

    case 3:

      bfd_put_8 (input_bfd, x, location);

      break;

    case 4:

      bfd_put_32 (input_bfd, x, location);

      break;

    }

  return overflow ? bfd_reloc_overflow : bfd_reloc_ok;

}

static bfd_reloc_status_type

tic30_aout_final_link_relocate (reloc_howto_type *howto,

                                bfd *input_bfd,

                                asection *input_section,

                                bfd_byte *contents,

                                bfd_vma address,

                                bfd_vma value,

                                bfd_vma addend)

{

  bfd_vma relocation;

  if (address > bfd_get_section_limit (input_bfd, input_section))

    return bfd_reloc_outofrange;

  relocation = value + addend;

  if (howto->pc_relative)

    {

      relocation -= (input_section->output_section->vma + input_section->output_offset);

      if (howto->pcrel_offset)

        relocation -= address;

    }

  return tic30_aout_relocate_contents (howto, input_bfd, relocation,

                                       contents + address);

}

/* Finish up the reading of an a.out file header.  */

static const bfd_target *

tic30_aout_object_p (bfd *abfd)

{

  struct external_exec exec_bytes;      /* Raw exec header from file.  */

  struct internal_exec exec;            /* Cleaned-up exec header.  */

  const bfd_target *target;

  bfd_size_type amt = EXEC_BYTES_SIZE;

  if (bfd_bread (& exec_bytes, amt, abfd) != amt)

    {

      if (bfd_get_error () != bfd_error_system_call)

        bfd_set_error (bfd_error_wrong_format);

      return 0;

    }

#ifdef SWAP_MAGIC

  exec.a_info = SWAP_MAGIC (exec_bytes.e_info);

#else

  exec.a_info = H_GET_32 (abfd, exec_bytes.e_info);

#endif /* SWAP_MAGIC */

  if (N_BADMAG (exec))

    return 0;

#ifdef MACHTYPE_OK

  if (!(MACHTYPE_OK (N_MACHTYPE (exec))))

    return 0;

#endif

  NAME (aout, swap_exec_header_in) (abfd, &exec_bytes, &exec);

#ifdef SWAP_MAGIC

  /* Swap_exec_header_in read in a_info with the wrong byte order.  */

  exec.a_info = SWAP_MAGIC (exec_bytes.e_info);

#endif

  target = NAME (aout, some_aout_object_p) (abfd, &exec, tic30_aout_callback);

#ifdef ENTRY_CAN_BE_ZERO

  /* The NEWSOS3 entry-point is/was 0, which (amongst other lossage)

     means that it isn't obvious if EXEC_P should be set.

     All of the following must be true for an executable:

     There must be no relocations, the bfd can be neither an

     archive nor an archive element, and the file must be executable.  */

  if (exec.a_trsize + exec.a_drsize == 0

      && bfd_get_format (abfd) == bfd_object && abfd->my_archive == NULL)

    {

      struct stat buf;

#ifndef S_IXUSR

#define S_IXUSR 0100            /* Execute by owner.  */

#endif

      if (stat (abfd->filename, &buf) == 0 && (buf.st_mode & S_IXUSR))

        abfd->flags |= EXEC_P;

    }

#endif

  return target;

}

/* Copy private section data.  This actually does nothing with the

   sections.  It copies the subformat field.  We copy it here, because

   we need to know whether this is a QMAGIC file before we set the

   section contents, and copy_private_bfd_data is not called until

   after the section contents have been set.  */

static bfd_boolean

MY_bfd_copy_private_section_data (bfd *ibfd,

                                  asection *isec ATTRIBUTE_UNUSED,

                                  bfd *obfd,

                                  asection *osec ATTRIBUTE_UNUSED)

{

  if (bfd_get_flavour (obfd) == bfd_target_aout_flavour)

    obj_aout_subformat (obfd) = obj_aout_subformat (ibfd);

  return TRUE;

}

/* Write an object file.

   Section contents have already been written.  We write the

   file header, symbols, and relocation.  */

static bfd_boolean

tic30_aout_write_object_contents (bfd *abfd)

{

  struct external_exec exec_bytes;

  struct internal_exec *execp = exec_hdr (abfd);

  obj_reloc_entry_size (abfd) = RELOC_STD_SIZE;

  {

    bfd_size_type text_size;    /* Dummy vars.  */

    file_ptr text_end;

    if (adata (abfd).magic == undecided_magic)

      NAME (aout, adjust_sizes_and_vmas) (abfd, &text_size, &text_end);

    execp->a_syms = bfd_get_symcount (abfd) * EXTERNAL_NLIST_SIZE;

    execp->a_entry = bfd_get_start_address (abfd);

    execp->a_trsize = ((obj_textsec (abfd)->reloc_count) * obj_reloc_entry_size (abfd));

    execp->a_drsize = ((obj_datasec (abfd)->reloc_count) * obj_reloc_entry_size (abfd));

    NAME (aout, swap_exec_header_out) (abfd, execp, &exec_bytes);

    if (adata (abfd).exec_bytes_size > 0)

      {

        bfd_size_type amt;

        if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)

          return FALSE;

        amt = adata (abfd).exec_bytes_size;

        if (bfd_bwrite (& exec_bytes, amt, abfd) != amt)

          return FALSE;

      }