--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/config/darwin-crt2.c	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,153 @@
+/* KeyMgr backwards-compatibility support for Darwin.
+   Copyright (C) 2001, 2002, 2004, 2009 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC 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, or (at your option) any later
+version.
+
+GCC 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+/* It is incorrect to include config.h here, because this file is being
+   compiled for the target, and hence definitions concerning only the host
+   do not apply.  */
+
+#include "tconfig.h"
+#include "tsystem.h"
+
+/* This file doesn't do anything useful on non-powerpc targets, since they
+   don't have backwards compatibility anyway.  */
+
+#ifdef __ppc__
+
+/* Homemade decls substituting for getsect.h and dyld.h, so cross
+   compilation works.  */
+struct mach_header;
+extern char *getsectdatafromheader (struct mach_header *, const char *,
+				    const char *, unsigned long *);
+extern void _dyld_register_func_for_add_image
+  (void (*) (struct mach_header *, unsigned long));
+extern void _dyld_register_func_for_remove_image
+  (void (*) (struct mach_header *, unsigned long));
+
+extern void __darwin_gcc3_preregister_frame_info (void);
+
+/* These are from "keymgr.h".  */
+extern void _init_keymgr (void);
+extern void *_keymgr_get_and_lock_processwide_ptr (unsigned key);
+extern void _keymgr_set_and_unlock_processwide_ptr (unsigned key, void *ptr);
+
+extern void *__keymgr_global[];
+typedef struct _Sinfo_Node {
+        unsigned int size ;             /*size of this node*/
+        unsigned short major_version ;  /*API major version.*/
+        unsigned short minor_version ;  /*API minor version.*/
+        } _Tinfo_Node ;
+
+/* KeyMgr 3.x is the first one supporting GCC3 stuff natively.  */
+#define KEYMGR_API_MAJOR_GCC3           3       
+/* ... with these keys.  */
+#define KEYMGR_GCC3_LIVE_IMAGE_LIST	301     /* loaded images  */
+#define KEYMGR_GCC3_DW2_OBJ_LIST	302     /* Dwarf2 object list  */   
+
+/* Node of KEYMGR_GCC3_LIVE_IMAGE_LIST.  Info about each resident image.  */
+struct live_images {
+  unsigned long this_size;                      /* sizeof (live_images)  */
+  struct mach_header *mh;                       /* the image info  */
+  unsigned long vm_slide;
+  void (*destructor)(struct live_images *);     /* destructor for this  */
+  struct live_images *next;
+  unsigned int examined_p;
+  void *fde;
+  void *object_info;
+  unsigned long info[2];                        /* Future use.  */
+};
+
+
+/* These routines are used only on Darwin versions before 10.2.
+   Later versions have equivalent code in the system.  
+   Eventually, they might go away, although it might be a long time...  */
+
+static void darwin_unwind_dyld_remove_image_hook 
+  (struct mach_header *m, unsigned long s);
+static void darwin_unwind_dyld_remove_image_hook 
+  (struct mach_header *m, unsigned long s);
+extern void __darwin_gcc3_preregister_frame_info (void);
+     
+static void
+darwin_unwind_dyld_add_image_hook (struct mach_header *mh, unsigned long slide)
+{
+  struct live_images *l = (struct live_images *)calloc (1, sizeof (*l));
+  l->mh = mh;
+  l->vm_slide = slide;
+  l->this_size = sizeof (*l);
+  l->next = (struct live_images *)
+	_keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST);
+  _keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, l);
+}
+
+static void
+darwin_unwind_dyld_remove_image_hook (struct mach_header *m, unsigned long s)
+{
+  struct live_images *top, **lip, *destroy = NULL;
+
+  /* Look for it in the list of live images and delete it.  */
+
+  top = (struct live_images *)
+	   _keymgr_get_and_lock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST);
+  for (lip = &top; *lip != NULL; lip = &(*lip)->next)
+    {
+      if ((*lip)->mh == m && (*lip)->vm_slide == s)
+        {
+          destroy = *lip;
+          *lip = destroy->next;			/* unlink DESTROY  */
+
+          if (destroy->this_size != sizeof (*destroy))	/* sanity check  */
+            abort ();
+
+          break;
+        }
+    }
+  _keymgr_set_and_unlock_processwide_ptr (KEYMGR_GCC3_LIVE_IMAGE_LIST, top);
+
+  /* Now that we have unlinked this from the image list, toss it.  */
+  if (destroy != NULL)
+    {
+      if (destroy->destructor != NULL)
+	(*destroy->destructor) (destroy);
+      free (destroy);
+    }
+}
+
+void
+__darwin_gcc3_preregister_frame_info (void)
+{
+  const _Tinfo_Node *info;
+  _init_keymgr ();
+  info = (_Tinfo_Node *)__keymgr_global[2];
+  if (info != NULL)
+    {
+      if (info->major_version >= KEYMGR_API_MAJOR_GCC3)
+	return;
+      /* Otherwise, use our own add_image_hooks.  */
+    }
+
+  _dyld_register_func_for_add_image (darwin_unwind_dyld_add_image_hook);
+  _dyld_register_func_for_remove_image (darwin_unwind_dyld_remove_image_hook);
+}
+
+#endif  /* __ppc__ */