2010-08-04 Tristan Gingold <gingold@adacore.com>

[binutils.git] / bfd / oasys.c

/* BFD back-end for oasys objects.
   Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2001,
   2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010
   Free Software Foundation, Inc.
   Written by Steve Chamberlain of Cygnus Support, <sac@cygnus.com>.

   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 UNDERSCORE_HACK 1
#include "sysdep.h"
#include "bfd.h"
#include "safe-ctype.h"
#include "libbfd.h"
#include "oasys.h"
#include "liboasys.h"

/* Read in all the section data and relocation stuff too.  */

static bfd_boolean
oasys_read_record (bfd *abfd, oasys_record_union_type *record)
{
  bfd_size_type amt = sizeof (record->header);

  if (bfd_bread ((void *) record, amt, abfd) != amt)
    return FALSE;

  amt = record->header.length - sizeof (record->header);
  if ((long) amt <= 0)
    return TRUE;
  if (bfd_bread ((void *) ((char *) record + sizeof (record->header)), amt, abfd)
      != amt)
    return FALSE;
  return TRUE;
}

static size_t
oasys_string_length (oasys_record_union_type *record)
{
  return record->header.length
    - ((char *) record->symbol.name - (char *) record);
}

/* Slurp the symbol table by reading in all the records at the start file
   till we get to the first section record.

   We'll sort the symbolss into  two lists, defined and undefined. The
   undefined symbols will be placed into the table according to their
   refno.

   We do this by placing all undefined symbols at the front of the table
   moving in, and the defined symbols at the end of the table moving back.  */

static bfd_boolean
oasys_slurp_symbol_table (bfd *const abfd)
{
  oasys_record_union_type record;
  oasys_data_type *data = OASYS_DATA (abfd);
  bfd_boolean loop = TRUE;
  asymbol *dest_defined;
  asymbol *dest;
  char *string_ptr;
  bfd_size_type amt;

  if (data->symbols != NULL)
    return TRUE;

  /* Buy enough memory for all the symbols and all the names.  */
  amt = abfd->symcount;
  amt *= sizeof (asymbol);
  data->symbols = bfd_alloc (abfd, amt);

  amt = data->symbol_string_length;
#ifdef UNDERSCORE_HACK
  /* Buy 1 more char for each symbol to keep the underscore in.  */
  amt += abfd->symcount;
#endif
  data->strings = bfd_alloc (abfd, amt);

  if (!data->symbols || !data->strings)
    return FALSE;

  dest_defined = data->symbols + abfd->symcount - 1;

  string_ptr = data->strings;
  if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
    return FALSE;
  while (loop)
    {
      if (! oasys_read_record (abfd, &record))
        return FALSE;

      switch (record.header.type)
        {
        case oasys_record_is_header_enum:
          break;
        case oasys_record_is_local_enum:
        case oasys_record_is_symbol_enum:
          {
            int flag = record.header.type == (int) oasys_record_is_local_enum ?
            (BSF_LOCAL) : (BSF_GLOBAL | BSF_EXPORT);

            size_t length = oasys_string_length (&record);
            switch (record.symbol.relb & RELOCATION_TYPE_BITS)
              {
              case RELOCATION_TYPE_ABS:
                dest = dest_defined--;
                dest->section = bfd_abs_section_ptr;
                dest->flags = 0;

                break;
              case RELOCATION_TYPE_REL:
                dest = dest_defined--;
                dest->section =
                  OASYS_DATA (abfd)->sections[record.symbol.relb &
                                              RELOCATION_SECT_BITS];
                if (record.header.type == (int) oasys_record_is_local_enum)
                  {
                    dest->flags = BSF_LOCAL;
                    if (dest->section == (asection *) (~0))
                      {
                        /* It seems that sometimes internal symbols are tied up, but
                       still get output, even though there is no
                       section */
                        dest->section = 0;
                      }
                  }
                else
                  dest->flags = flag;
                break;
              case RELOCATION_TYPE_UND:
                dest = data->symbols + H_GET_16 (abfd, record.symbol.refno);
                dest->section = bfd_und_section_ptr;
                break;
              case RELOCATION_TYPE_COM:
                dest = dest_defined--;
                dest->name = string_ptr;
                dest->the_bfd = abfd;
                dest->section = bfd_com_section_ptr;
                break;
              default:
                dest = dest_defined--;
                BFD_ASSERT (FALSE);
                break;
              }
            dest->name = string_ptr;
            dest->the_bfd = abfd;
            dest->udata.p = NULL;
            dest->value = H_GET_32 (abfd, record.symbol.value);

#ifdef UNDERSCORE_HACK
            if (record.symbol.name[0] != '_')
              {
                string_ptr[0] = '_';
                string_ptr++;
              }
#endif
            memcpy (string_ptr, record.symbol.name, length);

            string_ptr[length] = 0;
            string_ptr += length + 1;
          }
          break;
        default:
          loop = FALSE;
        }
    }
  return TRUE;
}

static long
oasys_get_symtab_upper_bound (bfd *const abfd)
{
  if (! oasys_slurp_symbol_table (abfd))
    return -1;

  return (abfd->symcount + 1) * (sizeof (oasys_symbol_type *));
}

extern const bfd_target oasys_vec;

static long
oasys_canonicalize_symtab (bfd *abfd, asymbol **location)
{
  asymbol *symbase;
  unsigned int counter;

  if (! oasys_slurp_symbol_table (abfd))
    return -1;

  symbase = OASYS_DATA (abfd)->symbols;
  for (counter = 0; counter < abfd->symcount; counter++)
    *(location++) = symbase++;

  *location = 0;
  return abfd->symcount;
}

/* Archive stuff.  */

static const bfd_target *
oasys_archive_p (bfd *abfd)
{
  oasys_archive_header_type header;
  oasys_extarchive_header_type header_ext;
  unsigned int i;
  file_ptr filepos;
  bfd_size_type amt;

  amt = sizeof (header_ext);
  if (bfd_seek (abfd, (file_ptr) 0, 0) != 0
      || bfd_bread ((void *) &header_ext, amt, abfd) != amt)
    {
      if (bfd_get_error () != bfd_error_system_call)
        bfd_set_error (bfd_error_wrong_format);
      return NULL;
    }

  header.version = H_GET_32 (abfd, header_ext.version);
  header.mod_count = H_GET_32 (abfd, header_ext.mod_count);
  header.mod_tbl_offset = H_GET_32 (abfd, header_ext.mod_tbl_offset);
  header.sym_tbl_size = H_GET_32 (abfd, header_ext.sym_tbl_size);
  header.sym_count = H_GET_32 (abfd, header_ext.sym_count);
  header.sym_tbl_offset = H_GET_32 (abfd, header_ext.sym_tbl_offset);
  header.xref_count = H_GET_32 (abfd, header_ext.xref_count);
  header.xref_lst_offset = H_GET_32 (abfd, header_ext.xref_lst_offset);

  /* There isn't a magic number in an Oasys archive, so the best we
     can do to verify reasonableness is to make sure that the values in
     the header are too weird.  */

  if (header.version > 10000
      || header.mod_count > 10000
      || header.sym_count > 100000
      || header.xref_count > 100000)
    return NULL;

  /* That all worked, let's buy the space for the header and read in
     the headers.  */
  {
    oasys_ar_data_type *ar;
    oasys_module_info_type *module;
    oasys_module_table_type record;

    amt = sizeof (oasys_ar_data_type);
    ar = bfd_alloc (abfd, amt);

    amt = header.mod_count;
    amt *= sizeof (oasys_module_info_type);
    module = bfd_alloc (abfd, amt);

    if (!ar || !module)
      return NULL;

    abfd->tdata.oasys_ar_data = ar;
    ar->module = module;
    ar->module_count = header.mod_count;

    filepos = header.mod_tbl_offset;
    for (i = 0; i < header.mod_count; i++)
      {
        if (bfd_seek (abfd, filepos, SEEK_SET) != 0)
          return NULL;

        /* There are two ways of specifying the archive header.  */
          {
            oasys_extmodule_table_type_b_type record_ext;

            amt = sizeof (record_ext);
            if (bfd_bread ((void *) &record_ext, amt, abfd) != amt)
              return NULL;

            record.mod_size = H_GET_32 (abfd, record_ext.mod_size);
            record.file_offset = H_GET_32 (abfd, record_ext.file_offset);

            record.dep_count = H_GET_32 (abfd, record_ext.dep_count);
            record.depee_count = H_GET_32 (abfd, record_ext.depee_count);
            record.sect_count = H_GET_32 (abfd, record_ext.sect_count);
            record.module_name_size = H_GET_32 (abfd,
                                                record_ext.mod_name_length);

            amt = record.module_name_size;
            module[i].name = bfd_alloc (abfd, amt + 1);
            if (!module[i].name)
              return NULL;
            if (bfd_bread ((void *) module[i].name, amt, abfd) != amt)
              return NULL;
            module[i].name[record.module_name_size] = 0;
            filepos += (sizeof (record_ext)
                        + record.dep_count * 4
                        + record.module_name_size + 1);
          }

        module[i].size = record.mod_size;
        module[i].pos = record.file_offset;
        module[i].abfd = 0;
      }
  }
  return abfd->xvec;
}

static bfd_boolean
oasys_mkobject (bfd *abfd)
{
  bfd_size_type amt = sizeof (oasys_data_type);

  abfd->tdata.oasys_obj_data = bfd_alloc (abfd, amt);

  return abfd->tdata.oasys_obj_data != NULL;
}

/* The howto table is build using the top two bits of a reloc byte to
   index into it. The bits are PCREL,WORD/LONG.  */

static reloc_howto_type howto_table[] =
{

  HOWTO (0, 0, 1, 16, FALSE, 0, complain_overflow_bitfield, 0, "abs16",   TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  HOWTO (0, 0, 2, 32, FALSE, 0, complain_overflow_bitfield, 0, "abs32",   TRUE, 0xffffffff, 0xffffffff, FALSE),
  HOWTO (0, 0, 1, 16, TRUE,  0, complain_overflow_signed,   0, "pcrel16", TRUE, 0x0000ffff, 0x0000ffff, FALSE),
  HOWTO (0, 0, 2, 32, TRUE,  0, complain_overflow_signed,   0, "pcrel32", TRUE, 0xffffffff, 0xffffffff, FALSE)
};

/* Read in all the section data and relocation stuff too.  */

static bfd_boolean
oasys_slurp_section_data (bfd *const abfd)
{
  oasys_record_union_type record;
  oasys_data_type *data = OASYS_DATA (abfd);
  bfd_boolean loop = TRUE;
  oasys_per_section_type *per;
  asection *s;
  bfd_size_type amt;

  /* See if the data has been slurped already.  */
  for (s = abfd->sections; s != NULL; s = s->next)
    {
      per = oasys_per_section (s);
      if (per->initialized)
        return TRUE;
    }

  if (data->first_data_record == 0)
    return TRUE;

  if (bfd_seek (abfd, data->first_data_record, SEEK_SET) != 0)
    return FALSE;

  while (loop)
    {
      if (! oasys_read_record (abfd, &record))
        return FALSE;

      switch (record.header.type)
        {
        case oasys_record_is_header_enum:
          break;
        case oasys_record_is_data_enum:
          {
            bfd_byte *src = record.data.data;
            bfd_byte *end_src = ((bfd_byte *) & record) + record.header.length;
            bfd_byte *dst_ptr;
            bfd_byte *dst_base_ptr;
            unsigned int relbit;
            unsigned int count;
            asection *section =
            data->sections[record.data.relb & RELOCATION_SECT_BITS];
            bfd_vma dst_offset;

            per = oasys_per_section (section);

            if (! per->initialized)
              {
                arelent **relpp;

                per->data = bfd_zalloc (abfd, section->size);
                if (!per->data)
                  return FALSE;
                relpp = &section->relocation;
                per->reloc_tail_ptr = (oasys_reloc_type **) relpp;
                per->had_vma = FALSE;
                per->initialized = TRUE;
                section->reloc_count = 0;
                section->flags = SEC_ALLOC;
              }

            dst_offset = H_GET_32 (abfd, record.data.addr);
            if (! per->had_vma)
              {
                /* Take the first vma we see as the base.  */
                section->vma = dst_offset;
                per->had_vma = TRUE;
              }

            dst_offset -= section->vma;

            dst_base_ptr = oasys_per_section (section)->data;
            dst_ptr = oasys_per_section (section)->data +
              dst_offset;

            if (src < end_src)
              section->flags |= SEC_LOAD | SEC_HAS_CONTENTS;

            while (src < end_src)
              {
                unsigned char mod_byte = *src++;
                size_t gap = end_src - src;

                count = 8;
                if (mod_byte == 0 && gap >= 8)
                  {
                    dst_ptr[0] = src[0];
                    dst_ptr[1] = src[1];
                    dst_ptr[2] = src[2];
                    dst_ptr[3] = src[3];
                    dst_ptr[4] = src[4];
                    dst_ptr[5] = src[5];
                    dst_ptr[6] = src[6];
                    dst_ptr[7] = src[7];
                    dst_ptr += 8;
                    src += 8;
                  }
                else
                  {
                    for (relbit = 1; count-- != 0 && src < end_src; relbit <<= 1)
                      {
                        if (relbit & mod_byte)
                          {
                            unsigned char reloc = *src;
                            /* This item needs to be relocated.  */
                            switch (reloc & RELOCATION_TYPE_BITS)
                              {
                              case RELOCATION_TYPE_ABS:
                                break;

                              case RELOCATION_TYPE_REL:
                                {
                                  /* Relocate the item relative to the section.  */
                                  oasys_reloc_type *r;

                                  amt = sizeof (oasys_reloc_type);
                                  r = bfd_alloc (abfd, amt);
                                  if (!r)
                                    return FALSE;
                                  *(per->reloc_tail_ptr) = r;
                                  per->reloc_tail_ptr = &r->next;
                                  r->next = NULL;
                                  /* Reference to undefined symbol.  */
                                  src++;
                                  /* There is no symbol.  */
                                  r->symbol = 0;
                                  /* Work out the howto.  */
                                  abort ();
                                  r->relent.address = dst_ptr - dst_base_ptr;
                                  r->relent.howto = &howto_table[reloc >> 6];
                                  r->relent.sym_ptr_ptr = NULL;
                                  section->reloc_count++;

                                  /* Fake up the data to look like
                                     it's got the -ve pc in it, this
                                     makes it much easier to convert
                                     into other formats.  This is done
                                     by hitting the addend.  */
                                  if (r->relent.howto->pc_relative)
                                    r->relent.addend -= dst_ptr - dst_base_ptr;
                                }
                                break;

                              case RELOCATION_TYPE_UND:
                                {
                                  oasys_reloc_type *r;

                                  amt = sizeof (oasys_reloc_type);
                                  r = bfd_alloc (abfd, amt);
                                  if (!r)
                                    return FALSE;
                                  *(per->reloc_tail_ptr) = r;
                                  per->reloc_tail_ptr = &r->next;
                                  r->next = NULL;
                                  /* Reference to undefined symbol.  */
                                  src++;
                                  /* Get symbol number.  */
                                  r->symbol = (src[0] << 8) | src[1];
                                  /* Work out the howto.  */
                                  abort ();

                                  r->relent.addend = 0;
                                  r->relent.address = dst_ptr - dst_base_ptr;
                                  r->relent.howto = &howto_table[reloc >> 6];
                                  r->relent.sym_ptr_ptr = NULL;
                                  section->reloc_count++;

                                  src += 2;
                                  /* Fake up the data to look like
                                     it's got the -ve pc in it, this
                                     makes it much easier to convert
                                     into other formats.  This is done
                                     by hitting the addend.  */
                                  if (r->relent.howto->pc_relative)
                                    r->relent.addend -= dst_ptr - dst_base_ptr;
                                }
                                break;
                              case RELOCATION_TYPE_COM:
                                BFD_FAIL ();
                              }
                          }
                        *dst_ptr++ = *src++;
                      }
                  }
              }
          }
          break;
        case oasys_record_is_local_enum:
        case oasys_record_is_symbol_enum:
        case oasys_record_is_section_enum:
          break;
        default:
          loop = FALSE;
        }
    }

  return TRUE;

}

#define MAX_SECS 16

static const bfd_target *
oasys_object_p (bfd *abfd)
{
  oasys_data_type *oasys;
  oasys_data_type *save = OASYS_DATA (abfd);
  bfd_boolean loop = TRUE;
  bfd_boolean had_usefull = FALSE;

  abfd->tdata.oasys_obj_data = 0;
  oasys_mkobject (abfd);
  oasys = OASYS_DATA (abfd);
  memset ((void *) oasys->sections, 0xff, sizeof (oasys->sections));

  /* Point to the start of the file.  */
  if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
    goto fail;
  oasys->symbol_string_length = 0;

  /* Inspect the records, but only keep the section info -
     remember the size of the symbols.  */
  oasys->first_data_record = 0;
  while (loop)
    {
      oasys_record_union_type record;
      if (! oasys_read_record (abfd, &record))
        goto fail;
      if ((size_t) record.header.length < (size_t) sizeof (record.header))
        goto fail;

      switch ((oasys_record_enum_type) (record.header.type))
        {
        case oasys_record_is_header_enum:
          had_usefull = TRUE;
          break;
        case oasys_record_is_symbol_enum:
        case oasys_record_is_local_enum:
          /* Count symbols and remember their size for a future malloc.  */
          abfd->symcount++;
          oasys->symbol_string_length += 1 + oasys_string_length (&record);
          had_usefull = TRUE;
          break;
        case oasys_record_is_section_enum:
          {
            asection *s;
            char *buffer;
            unsigned int section_number;

            if (record.section.header.length != sizeof (record.section))
              goto fail;

            buffer = bfd_alloc (abfd, (bfd_size_type) 3);
            if (!buffer)
              goto fail;
            section_number = record.section.relb & RELOCATION_SECT_BITS;
            sprintf (buffer, "%u", section_number);
            s = bfd_make_section (abfd, buffer);
            oasys->sections[section_number] = s;
            switch (record.section.relb & RELOCATION_TYPE_BITS)
              {
              case RELOCATION_TYPE_ABS:
              case RELOCATION_TYPE_REL:
                break;
              case RELOCATION_TYPE_UND:
              case RELOCATION_TYPE_COM:
                BFD_FAIL ();
              }

            s->size = H_GET_32 (abfd, record.section.value);
            s->vma = H_GET_32 (abfd, record.section.vma);
            s->flags = 0;
            had_usefull = TRUE;
          }
          break;
        case oasys_record_is_data_enum:
          oasys->first_data_record = bfd_tell (abfd) - record.header.length;
        case oasys_record_is_debug_enum:
        case oasys_record_is_module_enum:
        case oasys_record_is_named_section_enum:
        case oasys_record_is_end_enum:
          if (! had_usefull)
            goto fail;
          loop = FALSE;
          break;
        default:
          goto fail;
        }
    }
  oasys->symbols = NULL;

  /* Oasys support several architectures, but I can't see a simple way
     to discover which one is in a particular file - we'll guess.  */
  bfd_default_set_arch_mach (abfd, bfd_arch_m68k, 0);
  if (abfd->symcount != 0)
    abfd->flags |= HAS_SYMS;

  /* We don't know if a section has data until we've read it.  */
  oasys_slurp_section_data (abfd);

  return abfd->xvec;

fail:
  (void) bfd_release (abfd, oasys);
  abfd->tdata.oasys_obj_data = save;
  return NULL;
}


static void
oasys_get_symbol_info (bfd *ignore_abfd ATTRIBUTE_UNUSED,
                       asymbol *symbol,
                       symbol_info *ret)
{
  bfd_symbol_info (symbol, ret);

  if (!symbol->section)
    ret->type = (symbol->flags & BSF_LOCAL) ? 'a' : 'A';
}

static void
oasys_print_symbol (bfd *abfd, void * afile, asymbol *symbol, bfd_print_symbol_type how)
{
  FILE *file = (FILE *) afile;

  switch (how)
    {
    case bfd_print_symbol_name:
    case bfd_print_symbol_more:
      fprintf (file, "%s", symbol->name);
      break;
    case bfd_print_symbol_all:
      {
        const char *section_name = symbol->section == NULL ?
        (const char *) "*abs" : symbol->section->name;

        bfd_print_symbol_vandf (abfd, (void *) file, symbol);

        fprintf (file, " %-5s %s",
                 section_name,
                 symbol->name);
      }
      break;
    }
}

static bfd_boolean
oasys_new_section_hook (bfd *abfd, asection *newsect)
{
  if (!newsect->used_by_bfd)
    {
      newsect->used_by_bfd
        = bfd_alloc (abfd, (bfd_size_type) sizeof (oasys_per_section_type));
      if (!newsect->used_by_bfd)
        return FALSE;
    }
  oasys_per_section (newsect)->data = NULL;
  oasys_per_section (newsect)->section = newsect;
  oasys_per_section (newsect)->offset = 0;
  oasys_per_section (newsect)->initialized = FALSE;
  newsect->alignment_power = 1;

  /* Turn the section string into an index.  */
  sscanf (newsect->name, "%u", &newsect->target_index);

  return _bfd_generic_new_section_hook (abfd, newsect);
}


static long
oasys_get_reloc_upper_bound (bfd *abfd, sec_ptr asect)
{
  if (! oasys_slurp_section_data (abfd))
    return -1;
  return (asect->reloc_count + 1) * sizeof (arelent *);
}

static bfd_boolean
oasys_get_section_contents (bfd *abfd,
                            sec_ptr section,
                            void * location,
                            file_ptr offset,
                            bfd_size_type count)
{
  oasys_per_section_type *p = oasys_per_section (section);

  oasys_slurp_section_data (abfd);

  if (! p->initialized)
    (void) memset (location, 0, (size_t) count);
  else
    (void) memcpy (location, (void *) (p->data + offset), (size_t) count);

  return TRUE;
}

static long
oasys_canonicalize_reloc (bfd *ignore_abfd ATTRIBUTE_UNUSED,
                          sec_ptr section,
                          arelent **relptr,
                          asymbol **symbols ATTRIBUTE_UNUSED)
{
  unsigned int reloc_count = 0;
  oasys_reloc_type *src = (oasys_reloc_type *) (section->relocation);

  if (src != NULL)
    abort ();

  *relptr = NULL;
  return section->reloc_count = reloc_count;
}


/* Writing.  */

/* Calculate the checksum and write one record.  */

static bfd_boolean
oasys_write_record (bfd *abfd,
                    oasys_record_enum_type type,
                    oasys_record_union_type *record,
                    size_t size)
{
  int checksum;
  size_t i;
  unsigned char *ptr;

  record->header.length = size;
  record->header.type = (int) type;
  record->header.check_sum = 0;
  record->header.fill = 0;
  ptr = (unsigned char *) &record->pad[0];
  checksum = 0;
  for (i = 0; i < size; i++)
    checksum += *ptr++;
  record->header.check_sum = 0xff & (-checksum);
  if (bfd_bwrite ((void *) record, (bfd_size_type) size, abfd) != size)
    return FALSE;
  return TRUE;
}


/* Write out all the symbols.  */

static bfd_boolean
oasys_write_syms (bfd *abfd)
{
  unsigned int count;
  asymbol **generic = bfd_get_outsymbols (abfd);
  unsigned int sym_index = 0;

  for (count = 0; count < bfd_get_symcount (abfd); count++)
    {
      oasys_symbol_record_type symbol;
      asymbol *const g = generic[count];
      const char *src = g->name;
      char *dst = symbol.name;
      unsigned int l = 0;

      if (bfd_is_com_section (g->section))
        {
          symbol.relb = RELOCATION_TYPE_COM;
          H_PUT_16 (abfd, sym_index, symbol.refno);
          sym_index++;
        }
      else if (bfd_is_abs_section (g->section))
        {
          symbol.relb = RELOCATION_TYPE_ABS;
          H_PUT_16 (abfd, 0, symbol.refno);
        }
      else if (bfd_is_und_section (g->section))
        {
          symbol.relb = RELOCATION_TYPE_UND;
          H_PUT_16 (abfd, sym_index, symbol.refno);
          /* Overload the value field with the output sym_index number */
          sym_index++;
        }
      else if (g->flags & BSF_DEBUGGING)
        /* Throw it away.  */
        continue;
      else
        {
          if (g->section == NULL)
            /* Sometime, the oasys tools give out a symbol with illegal
               bits in it, we'll output it in the same broken way.  */
            symbol.relb = RELOCATION_TYPE_REL | 0;
          else
            symbol.relb = RELOCATION_TYPE_REL | g->section->output_section->target_index;

          H_PUT_16 (abfd, 0, symbol.refno);
        }

#ifdef UNDERSCORE_HACK
      if (src[l] == '_')
        dst[l++] = '.';
#endif
      while (src[l])
        {
          dst[l] = src[l];
          l++;
        }

      H_PUT_32 (abfd, g->value, symbol.value);

      if (g->flags & BSF_LOCAL)
        {
          if (! oasys_write_record (abfd,
                                    oasys_record_is_local_enum,
                                    (oasys_record_union_type *) & symbol,
                                    offsetof (oasys_symbol_record_type,
                                              name[0]) + l))
            return FALSE;
        }
      else
        {
          if (! oasys_write_record (abfd,
                                    oasys_record_is_symbol_enum,
                                    (oasys_record_union_type *) & symbol,
                                    offsetof (oasys_symbol_record_type,
                                              name[0]) + l))
            return FALSE;
        }
      g->value = sym_index - 1;
    }

  return TRUE;
}

/* Write a section header for each section.  */

static bfd_boolean
oasys_write_sections (bfd *abfd)
{
  asection *s;
  static oasys_section_record_type out;

  for (s = abfd->sections; s != NULL; s = s->next)
    {
      if (!ISDIGIT (s->name[0]))
        {
          (*_bfd_error_handler)
            (_("%s: can not represent section `%s' in oasys"),
             bfd_get_filename (abfd), s->name);
          bfd_set_error (bfd_error_nonrepresentable_section);
          return FALSE;
        }
      out.relb = RELOCATION_TYPE_REL | s->target_index;
      H_PUT_32 (abfd, s->size, out.value);
      H_PUT_32 (abfd, s->vma, out.vma);

      if (! oasys_write_record (abfd,
                                oasys_record_is_section_enum,
                                (oasys_record_union_type *) & out,
                                sizeof (out)))
        return FALSE;
    }
  return TRUE;
}

static bfd_boolean
oasys_write_header (bfd *abfd)
{
  /* Create and write the header.  */
  oasys_header_record_type r;
  size_t length = strlen (abfd->filename);

  if (length > (size_t) sizeof (r.module_name))
    length = sizeof (r.module_name);

  (void) memcpy (r.module_name, abfd->filename, length);
  (void) memset (r.module_name + length, ' ', sizeof (r.module_name) - length);

  r.version_number = OASYS_VERSION_NUMBER;
  r.rev_number = OASYS_REV_NUMBER;

  return oasys_write_record (abfd, oasys_record_is_header_enum,
                             (oasys_record_union_type *) & r,
                             offsetof (oasys_header_record_type,
                                       description[0]));
}

static bfd_boolean
oasys_write_end (bfd *abfd)
{
  oasys_end_record_type end;
  unsigned char null = 0;

  end.relb = RELOCATION_TYPE_ABS;
  H_PUT_32 (abfd, abfd->start_address, end.entry);
  H_PUT_16 (abfd, 0, end.fill);
  end.zero = 0;
  if (! oasys_write_record (abfd,
                            oasys_record_is_end_enum,
                            (oasys_record_union_type *) & end,
                            sizeof (end)))
    return FALSE;

  return bfd_bwrite ((void *) &null, (bfd_size_type) 1, abfd) == 1;
}

static int
comp (const void * ap, const void * bp)
{
  arelent *a = *((arelent **) ap);
  arelent *b = *((arelent **) bp);

  return a->address - b->address;
}

static bfd_boolean
oasys_write_data (bfd *abfd)
{
  asection *s;

  for (s = abfd->sections; s != NULL; s = s->next)
    {
      if (s->flags & SEC_LOAD)
        {
          bfd_byte *raw_data = oasys_per_section (s)->data;
          oasys_data_record_type processed_data;
          bfd_size_type current_byte_index = 0;
          unsigned int relocs_to_go = s->reloc_count;
          arelent **p = s->orelocation;

          if (s->reloc_count != 0)
            /* Sort the reloc records so it's easy to insert the relocs into the
               data.  */
            qsort (s->orelocation, s->reloc_count, sizeof (arelent **), comp);

          current_byte_index = 0;
          processed_data.relb = s->target_index | RELOCATION_TYPE_REL;

          while (current_byte_index < s->size)
            {
              /* Scan forwards by eight bytes or however much is left and see if
               there are any relocations going on.  */
              bfd_byte *mod = &processed_data.data[0];
              bfd_byte *dst = &processed_data.data[1];

              unsigned int i = 0;
              *mod = 0;

              H_PUT_32 (abfd, s->vma + current_byte_index,
                        processed_data.addr);

              /* Don't start a relocation unless you're sure you can finish it
                 within the same data record.  The worst case relocation is a
                 4-byte relocatable value which is split across two modification
                 bytes (1 relocation byte + 2 symbol reference bytes + 2 data +
                 1 modification byte + 2 data = 8 bytes total).  That's where
                 the magic number 8 comes from.  */
              while (current_byte_index < s->size && dst <=
                     & processed_data.data[sizeof (processed_data.data) - 8])
                {
                  if (relocs_to_go != 0)
                    {
                      arelent *r = *p;

                      /* There is a relocation, is it for this byte ?  */
                      if (r->address == current_byte_index)
                        abort ();
                    }

                  /* If this is coming from an unloadable section then copy
                     zeros.  */
                  if (raw_data == NULL)
                    *dst++ = 0;
                  else
                    *dst++ = *raw_data++;

                  if (++i >= 8)
                    {
                      i = 0;
                      mod = dst++;
                      *mod = 0;
                    }
                  current_byte_index++;
                }

              /* Don't write a useless null modification byte.  */
              if (dst == mod + 1)
                --dst;

              if (! (oasys_write_record
                     (abfd, oasys_record_is_data_enum,
                      ((oasys_record_union_type *) &processed_data),
                      (size_t) (dst - (bfd_byte *) &processed_data))))
                return FALSE;
            }
        }
    }

  return TRUE;
}

static bfd_boolean
oasys_write_object_contents (bfd *abfd)
{
  if (! oasys_write_header (abfd))
    return FALSE;
  if (! oasys_write_syms (abfd))
    return FALSE;
  if (! oasys_write_sections (abfd))
    return FALSE;
  if (! oasys_write_data (abfd))
    return FALSE;
  if (! oasys_write_end (abfd))
    return FALSE;
  return TRUE;
}

/* Set section contents is complicated with OASYS since the format is
   not a byte image, but a record stream.  */

static bfd_boolean
oasys_set_section_contents (bfd *abfd,
                            sec_ptr section,
                            const void * location,
                            file_ptr offset,
                            bfd_size_type count)
{
  if (count != 0)
    {
      if (oasys_per_section (section)->data == NULL)
        {
          oasys_per_section (section)->data = bfd_alloc (abfd, section->size);
          if (!oasys_per_section (section)->data)
            return FALSE;
        }
      (void) memcpy ((void *) (oasys_per_section (section)->data + offset),
                     location, (size_t) count);
    }
  return TRUE;
}



/* Native-level interface to symbols.  */

/* We read the symbols into a buffer, which is discarded when this
   function exits.  We read the strings into a buffer large enough to
   hold them all plus all the cached symbol entries.  */

static asymbol *
oasys_make_empty_symbol (bfd *abfd)
{
  bfd_size_type amt = sizeof (oasys_symbol_type);
  oasys_symbol_type *new_symbol_type = bfd_zalloc (abfd, amt);

  if (!new_symbol_type)
    return NULL;
  new_symbol_type->symbol.the_bfd = abfd;
  return &new_symbol_type->symbol;
}

/* User should have checked the file flags; perhaps we should return
   BFD_NO_MORE_SYMBOLS if there are none?  */

static bfd *
oasys_openr_next_archived_file (bfd *arch, bfd *prev)
{
  oasys_ar_data_type *ar = OASYS_AR_DATA (arch);
  oasys_module_info_type *p;

  /* Take the next one from the arch state, or reset.  */
  if (prev == NULL)
    /* Reset the index - the first two entries are bogus.  */
    ar->module_index = 0;

  p = ar->module + ar->module_index;
  ar->module_index++;

  if (ar->module_index <= ar->module_count)
    {
      if (p->abfd == NULL)
        {
          p->abfd = _bfd_create_empty_archive_element_shell (arch);
          p->abfd->origin = p->pos;
          p->abfd->filename = p->name;

          /* Fixup a pointer to this element for the member.  */
          p->abfd->arelt_data = (void *) p;
        }
      return p->abfd;
    }

  bfd_set_error (bfd_error_no_more_archived_files);
  return NULL;
}

static bfd_boolean
oasys_find_nearest_line (bfd *abfd ATTRIBUTE_UNUSED,
                         asection *section ATTRIBUTE_UNUSED,
                         asymbol **symbols ATTRIBUTE_UNUSED,
                         bfd_vma offset ATTRIBUTE_UNUSED,
                         const char **filename_ptr ATTRIBUTE_UNUSED,
                         const char **functionname_ptr ATTRIBUTE_UNUSED,
                         unsigned int *line_ptr ATTRIBUTE_UNUSED)
{
  return FALSE;
}

static bfd_boolean
oasys_find_inliner_info (bfd *abfd ATTRIBUTE_UNUSED,
                         const char **filename_ptr ATTRIBUTE_UNUSED,
                         const char **functionname_ptr ATTRIBUTE_UNUSED,
                         unsigned int *line_ptr ATTRIBUTE_UNUSED)
{
  return FALSE;
}

static int
oasys_generic_stat_arch_elt (bfd *abfd, struct stat *buf)
{
  oasys_module_info_type *mod = (oasys_module_info_type *) abfd->arelt_data;

  if (mod == NULL)
    {
      bfd_set_error (bfd_error_invalid_operation);
      return -1;
    }

  buf->st_size = mod->size;
  buf->st_mode = 0666;
  return 0;
}

static int
oasys_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED,
                      struct bfd_link_info *info ATTRIBUTE_UNUSED)
{
  return 0;
}

#define oasys_close_and_cleanup                    _bfd_generic_close_and_cleanup
#define oasys_bfd_free_cached_info                 _bfd_generic_bfd_free_cached_info
#define oasys_slurp_armap                          bfd_true
#define oasys_slurp_extended_name_table            bfd_true
#define oasys_construct_extended_name_table        ((bfd_boolean (*) (bfd *, char **, bfd_size_type *, const char **)) bfd_true)
#define oasys_truncate_arname                      bfd_dont_truncate_arname
#define oasys_write_armap                          ((bfd_boolean (*) (bfd *, unsigned int, struct orl *, unsigned int, int)) bfd_true)
#define oasys_read_ar_hdr                          bfd_nullvoidptr
#define oasys_write_ar_hdr ((bfd_boolean (*) (bfd *, bfd *)) bfd_false)
#define oasys_get_elt_at_index                     _bfd_generic_get_elt_at_index
#define oasys_update_armap_timestamp               bfd_true
#define oasys_bfd_is_local_label_name              bfd_generic_is_local_label_name
#define oasys_bfd_is_target_special_symbol         ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)
#define oasys_get_lineno                           _bfd_nosymbols_get_lineno
#define oasys_bfd_make_debug_symbol                _bfd_nosymbols_bfd_make_debug_symbol
#define oasys_read_minisymbols                     _bfd_generic_read_minisymbols
#define oasys_minisymbol_to_symbol                 _bfd_generic_minisymbol_to_symbol
#define oasys_bfd_reloc_type_lookup                _bfd_norelocs_bfd_reloc_type_lookup
#define oasys_bfd_reloc_name_lookup          _bfd_norelocs_bfd_reloc_name_lookup
#define oasys_set_arch_mach                        bfd_default_set_arch_mach
#define oasys_get_section_contents_in_window       _bfd_generic_get_section_contents_in_window
#define oasys_bfd_get_relocated_section_contents   bfd_generic_get_relocated_section_contents
#define oasys_bfd_relax_section                    bfd_generic_relax_section
#define oasys_bfd_gc_sections                      bfd_generic_gc_sections
#define oasys_bfd_merge_sections                   bfd_generic_merge_sections
#define oasys_bfd_is_group_section                 bfd_generic_is_group_section
#define oasys_bfd_discard_group                    bfd_generic_discard_group
#define oasys_section_already_linked               _bfd_generic_section_already_linked
#define oasys_bfd_define_common_symbol             bfd_generic_define_common_symbol
#define oasys_bfd_link_hash_table_create           _bfd_generic_link_hash_table_create
#define oasys_bfd_link_hash_table_free             _bfd_generic_link_hash_table_free
#define oasys_bfd_link_add_symbols                 _bfd_generic_link_add_symbols
#define oasys_bfd_link_just_syms                   _bfd_generic_link_just_syms
#define oasys_bfd_copy_link_hash_symbol_type \
  _bfd_generic_copy_link_hash_symbol_type
#define oasys_bfd_final_link                       _bfd_generic_final_link
#define oasys_bfd_link_split_section               _bfd_generic_link_split_section

const bfd_target oasys_vec =
{
  "oasys",                      /* Name.  */
  bfd_target_oasys_flavour,
  BFD_ENDIAN_BIG,               /* Target byte order.  */
  BFD_ENDIAN_BIG,               /* Target headers byte order.  */
  (HAS_RELOC | EXEC_P |         /* Object flags.  */
   HAS_LINENO | HAS_DEBUG |
   HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
  (SEC_CODE | SEC_DATA | SEC_ROM | SEC_HAS_CONTENTS
   | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* Section flags.  */
  0,                            /* Leading underscore.  */
  ' ',                          /* AR_pad_char.  */
  16,                           /* AR_max_namelen.  */
  bfd_getb64, bfd_getb_signed_64, bfd_putb64,
  bfd_getb32, bfd_getb_signed_32, bfd_putb32,
  bfd_getb16, bfd_getb_signed_16, bfd_putb16,   /* Data.  */
  bfd_getb64, bfd_getb_signed_64, bfd_putb64,
  bfd_getb32, bfd_getb_signed_32, bfd_putb32,
  bfd_getb16, bfd_getb_signed_16, bfd_putb16,   /* Headers.  */

  {_bfd_dummy_target,
   oasys_object_p,              /* bfd_check_format.  */
   oasys_archive_p,
   _bfd_dummy_target,
  },
  {                             /* bfd_set_format.  */
    bfd_false,
    oasys_mkobject,
    _bfd_generic_mkarchive,
    bfd_false
  },
  {                             /* bfd_write_contents.  */
    bfd_false,
    oasys_write_object_contents,
    _bfd_write_archive_contents,
    bfd_false,
  },

  BFD_JUMP_TABLE_GENERIC (oasys),
  BFD_JUMP_TABLE_COPY (_bfd_generic),
  BFD_JUMP_TABLE_CORE (_bfd_nocore),
  BFD_JUMP_TABLE_ARCHIVE (oasys),
  BFD_JUMP_TABLE_SYMBOLS (oasys),
  BFD_JUMP_TABLE_RELOCS (oasys),
  BFD_JUMP_TABLE_WRITE (oasys),
  BFD_JUMP_TABLE_LINK (oasys),
  BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),

  NULL,

  NULL
};