diff --git a/src/mi/dyn-register.c b/src/mi/dyn-register.c
index e69de29b..5f581366 100644
--- a/src/mi/dyn-register.c
+++ b/src/mi/dyn-register.c
@@ -0,0 +1,44 @@
+/* libunwind - a platform-independent unwind library
+   Copyright (C) 2001-2002 Hewlett-Packard Co
+	Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
+
+This file is part of libunwind.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */
+
+#include "internal.h"
+
+HIDDEN pthread_mutex_t _U_dyn_info_list_lock = PTHREAD_MUTEX_INITIALIZER;
+
+void
+_U_dyn_register (unw_dyn_info_t *di)
+{
+  mutex_lock (&_U_dyn_info_list_lock);
+  {
+    ++_U_dyn_info_list.generation;
+
+    di->next = _U_dyn_info_list.first;
+    di->prev = NULL;
+    if (di->next)
+	    di->next->prev = di;
+    _U_dyn_info_list.first = di;
+  }
+  mutex_unlock (&_U_dyn_info_list_lock);
+}