sunos.em

基于4个mips核的noc设计

	}
      else
	{
	  dircopy = (char *) xmalloc (s - path + 1);
	  memcpy (dircopy, path, s - path);
	  dircopy[s - path] = '\0';
	  dir = dircopy;
	}

      if (gld${EMULATION_NAME}_try_needed (dir, name))
	return true;

      if (dircopy != NULL)
	free (dircopy);

      if (s == NULL)
	break;
      path = s + 1;
    }

  return false;	  
}

/* This function is called for each possible directory for a needed
   dynamic object.  */

static boolean
gld${EMULATION_NAME}_try_needed (dir, name)
     const char *dir;
     const char *name;
{
  char *file;
  char *alc;
  boolean ignore;
  bfd *abfd;

  file = gld${EMULATION_NAME}_search_dir (dir, name, &ignore);
  if (file == NULL)
    return false;

  alc = (char *) xmalloc (strlen (dir) + strlen (file) + 2);
  sprintf (alc, "%s/%s", dir, file);
  free (file);
  abfd = bfd_openr (alc, bfd_get_target (output_bfd));
  if (abfd == NULL)
    return false;
  if (! bfd_check_format (abfd, bfd_object))
    {
      (void) bfd_close (abfd);
      return false;
    }
  if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
    {
      (void) bfd_close (abfd);
      return false;
    }

  /* We've found the needed dynamic object.  */

  /* Add this file into the symbol table.  */
  if (! bfd_link_add_symbols (abfd, &link_info))
    einfo ("%F%B: could not read symbols: %E\n", abfd);

  return true;
}

/* See if we have already included a needed object in the link.  This
   does not have to be precise, as it does no harm to include a
   dynamic object more than once.  */

static void
gld${EMULATION_NAME}_check_needed (s)
     lang_input_statement_type *s;
{
  if (s->filename == NULL)
    return;
  if (strncmp (global_needed->name, "-l", 2) != 0)
    {
      if (strcmp (s->filename, global_needed->name) == 0)
	global_found = true;
    }
  else
    {
      const char *sname, *lname;
      const char *sdot, *ldot;
      int lmaj, lmin, smaj, smin;

      lname = global_needed->name + 2;

      sname = strrchr (s->filename, '/');
      if (sname == NULL)
	sname = s->filename;
      else
	++sname;

      if (strncmp (sname, "lib", 3) != 0)
	return;
      sname += 3;

      ldot = strchr (lname, '.');
      if (ldot == NULL)
	ldot = lname + strlen (lname);

      sdot = strstr (sname, ".so.");
      if (sdot == NULL)
	return;

      if (sdot - sname != ldot - lname
	  || strncmp (lname, sname, sdot - sname) != 0)
	return;

      lmaj = lmin = -1;
      sscanf (ldot, ".%d.%d", &lmaj, &lmin);
      smaj = smin = -1;
      sscanf (sdot, ".so.%d.%d", &smaj, &smin);
      if ((smaj != lmaj && smaj != -1 && lmaj != -1)
	  || (smin != lmin && smin != -1 && lmin != -1))
	return;

      global_found = true;
    }
}

/* We need to use static variables to pass information around the call
   to lang_for_each_statement.  Ick.  */

static const char *find_assign;
static boolean found_assign;

/* We need to use static variables to pass information around the call
   to lang_for_each_input_file.  Ick.  */

static bfd_size_type need_size;
static bfd_size_type need_entries;
static bfd_byte *need_contents;
static bfd_byte *need_pinfo;
static bfd_byte *need_pnames;

/* The size of one entry in the .need section, not including the file
   name.  */

#define NEED_ENTRY_SIZE (16)

/* This is called after the sections have been attached to output
   sections, but before any sizes or addresses have been set.  */

static void
gld${EMULATION_NAME}_before_allocation ()
{
  struct bfd_link_hash_entry *hdyn = NULL;
  asection *sneed;
  asection *srules;
  asection *sdyn;

  /* The SunOS native linker creates a shared library whenever there
     are any undefined symbols in a link, unless -e is used.  This is
     pretty weird, but we are compatible.  */
  if (! link_info.shared && ! link_info.relocateable && ! entry_from_cmdline)
    {
      struct bfd_link_hash_entry *h;
      
      for (h = link_info.hash->undefs; h != NULL; h = h->next)
	{
	  if (h->type == bfd_link_hash_undefined
	      && h->u.undef.abfd != NULL
	      && (h->u.undef.abfd->flags & DYNAMIC) == 0
	      && strcmp (h->root.string, "__DYNAMIC") != 0
	      && strcmp (h->root.string, "__GLOBAL_OFFSET_TABLE_") != 0)
	    {
	      find_assign = h->root.string;
	      found_assign = false;
	      lang_for_each_statement (gld${EMULATION_NAME}_find_assignment);
	      if (! found_assign)
		{
		  link_info.shared = true;
		  break;
		}
	    }
	}
    }

  if (link_info.shared)
    {
      lang_output_section_statement_type *os;

      /* Set the .text section to start at 0x20, not 0x2020.  FIXME:
         This is too magical.  */
      os = lang_output_section_statement_lookup (".text");
      if (os->addr_tree == NULL)
	os->addr_tree = exp_intop (0x20);
    }

  /* We need to create a __DYNAMIC symbol.  We don't do this in the
     linker script because we want to set the value to the start of
     the dynamic section if there is one, or to zero if there isn't
     one.  We need to create the symbol before calling
     size_dynamic_sections, although we can't set the value until
     afterward.  */
  if (! link_info.relocateable)
    {
      hdyn = bfd_link_hash_lookup (link_info.hash, "__DYNAMIC", true, false,
				   false);
      if (hdyn == NULL)
	einfo ("%P%F: bfd_link_hash_lookup: %E\n");
      if (! bfd_sunos_record_link_assignment (output_bfd, &link_info,
					      "__DYNAMIC"))
	einfo ("%P%F: failed to record assignment to __DYNAMIC: %E\n");
    }

  /* If we are going to make any variable assignments, we need to let
     the backend linker know about them in case the variables are
     referred to by dynamic objects.  */
  lang_for_each_statement (gld${EMULATION_NAME}_find_assignment);

  /* Let the backend linker work out the sizes of any sections
     required by dynamic linking.  */
  if (! bfd_sunos_size_dynamic_sections (output_bfd, &link_info, &sdyn,
					 &sneed, &srules))
    einfo ("%P%F: failed to set dynamic section sizes: %E\n");

  if (sneed != NULL)
    {
      /* Set up the .need section.  See the description of the ld_need
	 field in include/aout/sun4.h.  */

      need_entries = 0;
      need_size = 0;

      lang_for_each_input_file (gld${EMULATION_NAME}_count_need);

      /* We should only have a .need section if we have at least one
	 dynamic object.  */
      ASSERT (need_entries != 0);

      sneed->_raw_size = need_size;
      sneed->contents = (bfd_byte *) xmalloc (need_size);

      need_contents = sneed->contents;
      need_pinfo = sneed->contents;
      need_pnames = sneed->contents + need_entries * 16;

      lang_for_each_input_file (gld${EMULATION_NAME}_set_need);

      ASSERT ((bfd_size_type) (need_pnames - sneed->contents) == need_size);
    }

  if (srules != NULL)
    {
      /* Set up the .rules section.  This is just a PATH like string
	 of the -L arguments given on the command line.  We permit the
	 user to specify the directories using the -rpath command line
	 option.  */
      if (command_line.rpath)
	{
	  srules->_raw_size = strlen (command_line.rpath);
	  srules->contents = (bfd_byte *) command_line.rpath;
	}
      else
	{
	  unsigned int size;
	  search_dirs_type *search;

	  size = 0;
	  for (search = search_head; search != NULL; search = search->next)
	    if (search->cmdline)
	      size += strlen (search->name) + 1;
	  srules->_raw_size = size;
	  if (size > 0)
	    {
	      char *p;

	      srules->contents = (bfd_byte *) xmalloc (size);
	      p = (char *) srules->contents;
	      *p = '\0';
	      for (search = search_head; search != NULL; search = search->next)
		{
		  if (search->cmdline)
		    {
		      if (p != (char *) srules->contents)
			*p++ = ':';
		      strcpy (p, search->name);
		      p += strlen (p);
		    }
		}
	    }
	}
    }

  /* We must assign a value to __DYNAMIC.  It should be zero if we are
     not doing a dynamic link, or the start of the .dynamic section if
     we are doing one.  */
  if (! link_info.relocateable)
    {
      hdyn->type = bfd_link_hash_defined;
      hdyn->u.def.value = 0;
      if (sdyn != NULL)
	hdyn->u.def.section = sdyn;
      else
	hdyn->u.def.section = bfd_abs_section_ptr;
    }
}

/* This is called by the before_allocation routine via
   lang_for_each_statement.  It does one of two things: if the
   variable find_assign is set, it sets found_assign if it finds an
   assignment to that variable; otherwise it tells the backend linker
   about all assignment statements, in case they are assignments to
   symbols which are referred to by dynamic objects.  */

static void
gld${EMULATION_NAME}_find_assignment (s)
     lang_statement_union_type *s;
{
  if (s->header.type == lang_assignment_statement_enum
      && (find_assign == NULL || ! found_assign))
    gld${EMULATION_NAME}_find_exp_assignment (s->assignment_statement.exp);
}

/* Look through an expression for an assignment statement.  */

static void
gld${EMULATION_NAME}_find_exp_assignment (exp)
     etree_type *exp;
{
  switch (exp->type.node_class)
    {
    case etree_assign:
      if (find_assign != NULL)
	{
	  if (strcmp (find_assign, exp->assign.dst) == 0)
	    found_assign = true;
	  return;
	}

      if (strcmp (exp->assign.dst, ".") != 0)
	{
	  if (! bfd_sunos_record_link_assignment (output_bfd, &link_info,
						  exp->assign.dst))
	    einfo ("%P%F: failed to record assignment to %s: %E\n",
		   exp->assign.dst);
	}
      gld${EMULATION_NAME}_find_exp_assignment (exp->assign.src);
      break;

    case etree_binary:
      gld${EMULATION_NAME}_find_exp_assignment (exp->binary.lhs);
      gld${EMULATION_NAME}_find_exp_assignment (exp->binary.rhs);
      break;

    case etree_trinary:
      gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.cond);
      gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.lhs);
      gld${EMULATION_NAME}_find_exp_assignment (exp->trinary.rhs);
      break;

    case etree_unary:
      gld${EMULATION_NAME}_find_exp_assignment (exp->unary.child);
      break;

    default:
      break;
    }
}

/* Work out the size of the .need section, and the number of entries.
   The backend will set the ld_need field of the dynamic linking
   information to point to the .need section.  See include/aout/sun4.h
   for more information.  */

static void
gld${EMULATION_NAME}_count_need (inp)
     lang_input_statement_type *inp;
{
  if (inp->the_bfd != NULL
      && (inp->the_bfd->flags & DYNAMIC) != 0)
    {
      ++need_entries;
      need_size += NEED_ENTRY_SIZE;
      if (! inp->is_archive)
	need_size += strlen (inp->filename) + 1;
      else
	{
	  ASSERT (inp->local_sym_name[0] == '-'
		  && inp->local_sym_name[1] == 'l');
	  need_size += strlen (inp->local_sym_name + 2) + 1;
	}
    }
}

/* Fill in the contents of the .need section.  */

static void
gld${EMULATION_NAME}_set_need (inp)
     lang_input_statement_type *inp;
{
  if (inp->the_bfd != NULL
      && (inp->the_bfd->flags & DYNAMIC) != 0)
    {
      bfd_size_type c;

      /* To really fill in the .need section contents, we need to know
	 the final file position of the section, but we don't.
	 Instead, we use offsets, and rely on the BFD backend to
	 finish the section up correctly.  FIXME: Talk about lack of
	 referential locality.  */
      bfd_put_32 (output_bfd, need_pnames - need_contents, need_pinfo);
      if (! inp->is_archive)
	{
	  bfd_put_32 (output_bfd, (bfd_vma) 0, need_pinfo + 4);
	  bfd_put_16 (output_bfd, (bfd_vma) 0, need_pinfo + 8);
	  bfd_put_16 (output_bfd, (bfd_vma) 0, need_pinfo + 10);
	  strcpy (need_pnames, inp->filename);
	}
      else
	{
	  char *verstr;
	  int maj, min;

	  bfd_put_32 (output_bfd, (bfd_vma) 0x80000000, need_pinfo + 4);
	  maj = 0;
	  min = 0;
	  verstr = strstr (inp->filename, ".so.");
	  if (verstr != NULL)
	    sscanf (verstr, ".so.%d.%d", &maj, &min);
	  bfd_put_16 (output_bfd, (bfd_vma) maj, need_pinfo + 8);
	  bfd_put_16 (output_bfd, (bfd_vma) min, need_pinfo + 10);
	  strcpy (need_pnames, inp->local_sym_name + 2);
	}

      c = (need_pinfo - need_contents) / NEED_ENTRY_SIZE;
      if (c + 1 >= need_entries)
	bfd_put_32 (output_bfd, (bfd_vma) 0, need_pinfo + 12);
      else
	bfd_put_32 (output_bfd, (bfd_vma) (c + 1) * NEED_ENTRY_SIZE,
		    need_pinfo + 12);

      need_pinfo += NEED_ENTRY_SIZE;
      need_pnames += strlen (need_pnames) + 1;
    }
}

static char *
gld${EMULATION_NAME}_get_script(isfile)
     int *isfile;
EOF

if test -n "$COMPILE_IN"
then
# Scripts compiled in.

# sed commands to quote an ld script as a C string.
sc="-f stringify.sed"

cat >>e${EMULATION_NAME}.c <<EOF
{			     
  *isfile = 0;

  if (link_info.relocateable == true && config.build_constructors == true)
    return
EOF
sed $sc ldscripts/${EMULATION_NAME}.xu                     >> e${EMULATION_NAME}.c
echo '  ; else if (link_info.relocateable == true) return' >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xr                     >> e${EMULATION_NAME}.c
echo '  ; else if (!config.text_read_only) return'         >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xbn                    >> e${EMULATION_NAME}.c
echo '  ; else if (!config.magic_demand_paged) return'     >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.xn                     >> e${EMULATION_NAME}.c
echo '  ; else return'                                     >> e${EMULATION_NAME}.c
sed $sc ldscripts/${EMULATION_NAME}.x                      >> e${EMULATION_NAME}.c
echo '; }'                                                 >> e${EMULATION_NAME}.c

else
# Scripts read from the filesystem.

cat >>e${EMULATION_NAME}.c <<EOF
{			     
  *isfile = 1;

  if (link_info.relocateable == true && config.build_constructors == true)
    return "ldscripts/${EMULATION_NAME}.xu";
  else if (link_info.relocateable == true)
    return "ldscripts/${EMULATION_NAME}.xr";
  else if (!config.text_read_only)
    return "ldscripts/${EMULATION_NAME}.xbn";
  else if (!config.magic_demand_paged)
    return "ldscripts/${EMULATION_NAME}.xn";
  else
    return "ldscripts/${EMULATION_NAME}.x";
}
EOF

fi

cat >>e${EMULATION_NAME}.c <<EOF

struct ld_emulation_xfer_struct ld_${EMULATION_NAME}_emulation = 
{
  gld${EMULATION_NAME}_before_parse,
  syslib_default,
  hll_default,
  after_parse_default,
  gld${EMULATION_NAME}_after_open,
  after_allocation_default,
  set_output_arch_default,
  ldemul_default_target,
  gld${EMULATION_NAME}_before_allocation,
  gld${EMULATION_NAME}_get_script,
  "${EMULATION_NAME}",
  "${OUTPUT_FORMAT}",
  NULL,	/* finish */
  gld${EMULATION_NAME}_create_output_section_statements,
  NULL,	/* open dynamic archive */
  NULL,	/* place orphan */
  gld${EMULATION_NAME}_set_symbols,
  NULL,	/* parse args */
  NULL,	/* unrecognized file */
  NULL,	/* list options */
  NULL,	/* recognized file */
  NULL 	/* find_potential_libraries */
};
EOF