sunos.em

基于4个mips核的noc设计

# This shell script emits a C file. -*- C -*-
# It does some substitutions.
cat >e${EMULATION_NAME}.c <<EOF
/* This file is is generated by a shell script.  DO NOT EDIT! */

/* SunOS emulation code for ${EMULATION_NAME}
   Copyright 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
   Free Software Foundation, Inc.
   Written by Steve Chamberlain <[e-mail]>
   SunOS shared library support by Ian Lance Taylor <[e-mail]>

This file is part of GLD, the Gnu Linker.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#define TARGET_IS_${EMULATION_NAME}

#include <ctype.h>

#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "libiberty.h"

#include "ld.h"
#include "ldmain.h"
#include "ldmisc.h"
#include "ldexp.h"
#include "ldlang.h"
#include "ldfile.h"
#include "ldemul.h"

#ifdef HAVE_DIRENT_H
# include <dirent.h>
#else
# define dirent direct
# ifdef HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
#  include <ndir.h>
# endif
#endif

static void gld${EMULATION_NAME}_before_parse PARAMS ((void));
static void gld${EMULATION_NAME}_set_symbols PARAMS ((void));
static void gld${EMULATION_NAME}_create_output_section_statements
  PARAMS ((void));
static void gld${EMULATION_NAME}_find_so
  PARAMS ((lang_input_statement_type *));
static char *gld${EMULATION_NAME}_search_dir
  PARAMS ((const char *, const char *, boolean *));
static void gld${EMULATION_NAME}_after_open PARAMS ((void));
static void gld${EMULATION_NAME}_check_needed
  PARAMS ((lang_input_statement_type *));
static boolean gld${EMULATION_NAME}_search_needed
  PARAMS ((const char *, const char *));
static boolean gld${EMULATION_NAME}_try_needed
  PARAMS ((const char *, const char *));
static void gld${EMULATION_NAME}_before_allocation PARAMS ((void));
static void gld${EMULATION_NAME}_find_assignment
  PARAMS ((lang_statement_union_type *));
static void gld${EMULATION_NAME}_find_exp_assignment PARAMS ((etree_type *));
static void gld${EMULATION_NAME}_count_need
  PARAMS ((lang_input_statement_type *));
static void gld${EMULATION_NAME}_set_need
  PARAMS ((lang_input_statement_type *));
static char *gld${EMULATION_NAME}_get_script PARAMS ((int *isfile));

static void
gld${EMULATION_NAME}_before_parse()
{
  ldfile_output_architecture = bfd_arch_${ARCH};
  config.dynamic_link = true;
  config.has_shared = true;
}

/* This is called after the command line arguments have been parsed,
   but before the linker script has been read.  If this is a native
   linker, we add the directories in LD_LIBRARY_PATH to the search
   list.  */

static void
gld${EMULATION_NAME}_set_symbols ()
{
EOF
if [ "x${host}" = "x${target}" ] ; then
  case " ${EMULATION_LIBPATH} " in
  *" ${EMULATION_NAME} "*)
cat >>e${EMULATION_NAME}.c <<EOF
  const char *env;

  env = (const char *) getenv ("LD_LIBRARY_PATH");
  if (env != NULL)
    {
      char *l;

      l = xstrdup (env);
      while (1)
	{
	  char *c;

	  c = strchr (l, ':');
	  if (c != NULL)
	    *c++ = '\0';
	  if (*l != '\0')
	    ldfile_add_library_path (l, false);
	  if (c == NULL)
	    break;
	  l = c;
	}
    }
EOF
  ;;
  esac
fi
cat >>e${EMULATION_NAME}.c <<EOF
}

/* Despite the name, we use this routine to search for dynamic
   libraries.  On SunOS this requires a directory search.  We need to
   find the .so file with the highest version number.  The user may
   restrict the major version by saying, e.g., -lc.1.  Also, if we
   find a .so file, we need to look for a the same file after
   replacing .so with .sa; if it exists, it will be an archive which
   provide some initializations for data symbols, and we need to
   search it after including the .so file.  */

static void
gld${EMULATION_NAME}_create_output_section_statements ()
{
  lang_for_each_input_file (gld${EMULATION_NAME}_find_so);
}

/* Search the directory for a .so file for each library search.  */

static void
gld${EMULATION_NAME}_find_so (inp)
     lang_input_statement_type *inp;
{
  search_dirs_type *search;
  char *found = NULL;
  char *alc;
  struct stat st;

  if (! inp->search_dirs_flag
      || ! inp->is_archive
      || ! inp->dynamic)
    return;

  ASSERT (strncmp (inp->local_sym_name, "-l", 2) == 0);

  for (search = search_head; search != NULL; search = search->next)
    {
      boolean found_static;

      found = gld${EMULATION_NAME}_search_dir (search->name, inp->filename,
					       &found_static);
      if (found != NULL || found_static)
	break;
    }

  if (found == NULL)
    {
      /* We did not find a matching .so file.  This isn't an error,
	 since there might still be a matching .a file, which will be
	 found by the usual search.  */
      return;
    }

  /* Replace the filename with the one we have found.  */
  alc = (char *) xmalloc (strlen (search->name) + strlen (found) + 2);
  sprintf (alc, "%s/%s", search->name, found);
  inp->filename = alc;

  /* Turn off the search_dirs_flag to prevent ldfile_open_file from
     searching for this file again.  */
  inp->search_dirs_flag = false;

  free (found);

  /* Now look for the same file name, but with .sa instead of .so.  If
     found, add it to the list of input files.  */
  alc = (char *) xmalloc (strlen (inp->filename) + 1);
  strcpy (alc, inp->filename);
  strstr (alc + strlen (search->name), ".so")[2] = 'a';
  if (stat (alc, &st) != 0)
    free (alc);
  else
    {
      lang_input_statement_type *sa;

      /* Add the .sa file to the statement list just before the .so
	 file.  This is really a hack.  */
      sa = ((lang_input_statement_type *)
	    xmalloc (sizeof (lang_input_statement_type)));
      *sa = *inp;

      inp->filename = alc;
      inp->local_sym_name = alc;

      inp->header.next = (lang_statement_union_type *) sa;
      inp->next_real_file = (lang_statement_union_type *) sa;
    }
}

/* Search a directory for a .so file.  */

static char *
gld${EMULATION_NAME}_search_dir (dirname, filename, found_static)
     const char *dirname;
     const char *filename;
     boolean *found_static;
{
  int force_maj, force_min;
  const char *dot;
  unsigned int len;
  char *alc;
  char *found;
  int max_maj, max_min;
  DIR *dir;
  struct dirent *entry;
  unsigned int dirnamelen;
  char *full_path;
  int statval;
  struct stat st;

  *found_static = false;

  force_maj = -1;
  force_min = -1;
  dot = strchr (filename, '.');
  if (dot == NULL)
    {
      len = strlen (filename);
      alc = NULL;
    }
  else
    {
      force_maj = atoi (dot + 1);

      len = dot - filename;
      alc = (char *) xmalloc (len + 1);
      strncpy (alc, filename, len);
      alc[len] = '\0';
      filename = alc;

      dot = strchr (dot + 1, '.');
      if (dot != NULL)
	force_min = atoi (dot + 1);
    }

  found = NULL;
  max_maj = max_min = 0;

  dir = opendir (dirname);
  if (dir == NULL)
    return NULL;
  dirnamelen = strlen (dirname);
  
  while ((entry = readdir (dir)) != NULL)
    {
      const char *s;
      int found_maj, found_min;

      if (strncmp (entry->d_name, "lib", 3) != 0
	  || strncmp (entry->d_name + 3, filename, len) != 0)
	continue;

      if (dot == NULL
	  && strcmp (entry->d_name + 3 + len, ".a") == 0)
	{
	  *found_static = true;
	  continue;
	}

      /* We accept libfoo.so without a version number, even though the
         native linker does not.  This is more convenient for packages
         which just generate .so files for shared libraries, as on ELF
         systems.  */
      if (strncmp (entry->d_name + 3 + len, ".so", 3) != 0)
	continue;
      if (entry->d_name[6 + len] == '\0')
	;
      else if (entry->d_name[6 + len] == '.'
	       && isdigit ((unsigned char) entry->d_name[7 + len]))
	;
      else
	continue;

      for (s = entry->d_name + 6 + len; *s != '\0'; s++)
	if (*s != '.' && ! isdigit ((unsigned char) *s))
	  break;
      if (*s != '\0')
	continue;

      /* We've found a .so file.  Work out the major and minor
	 version numbers.  */
      found_maj = 0;
      found_min = 0;
      sscanf (entry->d_name + 3 + len, ".so.%d.%d",
	      &found_maj, &found_min);

      if ((force_maj != -1 && force_maj != found_maj)
	  || (force_min != -1 && force_min != found_min))
	continue;

      /* Make sure the file really exists (ignore broken symlinks).  */
      full_path = xmalloc (dirnamelen + 1 + strlen (entry->d_name) + 1);
      sprintf (full_path, "%s/%s", dirname, entry->d_name);
      statval = stat (full_path, &st);
      free (full_path);
      if (statval != 0)
	continue;

      /* We've found a match for the name we are searching for.  See
	 if this is the version we should use.  If the major and minor
	 versions match, we use the last entry in alphabetical order;
	 I don't know if this is how SunOS distinguishes libc.so.1.8
	 from libc.so.1.8.1, but it ought to suffice.  */
      if (found == NULL
	  || (found_maj > max_maj)
	  || (found_maj == max_maj
	      && (found_min > max_min
		  || (found_min == max_min
		      && strcmp (entry->d_name, found) > 0))))
	{
	  if (found != NULL)
	    free (found);
	  found = (char *) xmalloc (strlen (entry->d_name) + 1);
	  strcpy (found, entry->d_name);
	  max_maj = found_maj;
	  max_min = found_min;
	}
    }

  closedir (dir);

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

  return found;
}

/* These variables are required to pass information back and forth
   between after_open and check_needed.  */

static struct bfd_link_needed_list *global_needed;
static boolean global_found;

/* This is called after all the input files have been opened.  */

static void
gld${EMULATION_NAME}_after_open ()
{
  struct bfd_link_needed_list *needed, *l;

  /* We only need to worry about this when doing a final link.  */
  if (link_info.relocateable || link_info.shared)
    return;

  /* Get the list of files which appear in ld_need entries in dynamic
     objects included in the link.  For each such file, we want to
     track down the corresponding library, and include the symbol
     table in the link.  This is what the runtime dynamic linker will
     do.  Tracking the files down here permits one dynamic object to
     include another without requiring special action by the person
     doing the link.  Note that the needed list can actually grow
     while we are stepping through this loop.  */
  needed = bfd_sunos_get_needed_list (output_bfd, &link_info);
  for (l = needed; l != NULL; l = l->next)
    {
      struct bfd_link_needed_list *ll;
      const char *lname;
      search_dirs_type *search;

      lname = l->name;

      /* If we've already seen this file, skip it.  */
      for (ll = needed; ll != l; ll = ll->next)
	if (strcmp (ll->name, lname) == 0)
	  break;
      if (ll != l)
	continue;

      /* See if this file was included in the link explicitly.  */
      global_needed = l;
      global_found = false;
      lang_for_each_input_file (gld${EMULATION_NAME}_check_needed);
      if (global_found)
	continue;

      if (strncmp (lname, "-l", 2) != 0)
	{
	  bfd *abfd;

	  abfd = bfd_openr (lname, bfd_get_target (output_bfd));
	  if (abfd != NULL)
	    {
	      if (! bfd_check_format (abfd, bfd_object))
		{
		  (void) bfd_close (abfd);
		  abfd = NULL;
		}
	    }
	  if (abfd != NULL)
	    {
	      if ((bfd_get_file_flags (abfd) & DYNAMIC) == 0)
		{
		  (void) bfd_close (abfd);
		  abfd = NULL;
		}
	    }
	  if (abfd != NULL)
	    {
	      /* We've found the needed dynamic object.  */
	      if (! bfd_link_add_symbols (abfd, &link_info))
		einfo ("%F%B: could not read symbols: %E\n", abfd);
	    }
	  else
	    {
	      einfo ("%P: warning: %s, needed by %B, not found\n",
		     lname, l->by);
	    }

	  continue;
	}

      lname += 2;

      /* We want to search for the file in the same way that the
	 dynamic linker will search.  That means that we want to use
	 rpath_link, rpath or -L, then the environment variable
	 LD_LIBRARY_PATH (native only), then (if rpath was used) the
	 linker script LIB_SEARCH_DIRS.  */
      if (gld${EMULATION_NAME}_search_needed (command_line.rpath_link,
					      lname))
	continue;
      if (command_line.rpath != NULL)
	{
	  if (gld${EMULATION_NAME}_search_needed (command_line.rpath, lname))
	    continue;
	}
      else
	{
	  for (search = search_head; search != NULL; search = search->next)
	    if (gld${EMULATION_NAME}_try_needed (search->name, lname))
	      break;
	  if (search != NULL)
	    continue;
	}
EOF
if [ "x${host}" = "x${target}" ] ; then
  case " ${EMULATION_LIBPATH} " in
  *" ${EMULATION_NAME} "*)
cat >>e${EMULATION_NAME}.c <<EOF
      {
	const char *lib_path;

	lib_path = (const char *) getenv ("LD_LIBRARY_PATH");
	if (gld${EMULATION_NAME}_search_needed (lib_path, lname))
	  continue;
      }
EOF
  ;;
  esac
fi
cat >>e${EMULATION_NAME}.c <<EOF
      if (command_line.rpath != NULL)
	{
	  for (search = search_head; search != NULL; search = search->next)
	    {
	      if (search->cmdline)
		continue;
	      if (gld${EMULATION_NAME}_try_needed (search->name, lname))
		break;
	    }
	  if (search != NULL)
	    continue;
	}

      einfo ("%P: warning: %s, needed by %B, not found\n",
	     l->name, l->by);
    }
}

/* Search for a needed file in a path.  */

static boolean
gld${EMULATION_NAME}_search_needed (path, name)
     const char *path;
     const char *name;
{
  const char *s;

  if (path == NULL || *path == '\0')
    return false;
  while (1)
    {
      const char *dir;
      char *dircopy;

      s = strchr (path, ':');
      if (s == NULL)
	{
	  dircopy = NULL;
	  dir = path;