diff --git a/src/ia64/Gis_signal_frame.c b/src/ia64/Gis_signal_frame.c
new file mode 100644
index 00000000..f9e0f62b
--- /dev/null
+++ b/src/ia64/Gis_signal_frame.c
@@ -0,0 +1,53 @@
+/* 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 "unwind_i.h"
+
+PROTECTED int
+unw_is_signal_frame (unw_cursor_t *cursor)
+{
+  struct cursor *c = (struct cursor *) cursor;
+  struct ia64_state_record sr;
+  int ret;
+
+  /* Crude and slow, but we need to peek ahead into the unwind
+     descriptors to find out if the current IP is inside the signal
+     trampoline.  */
+  ret = ia64_fetch_proc_info (c, c->ip, 1);
+  if (ret < 0)
+    return ret;
+
+  ret = ia64_create_state_record (c, &sr);
+  if (ret < 0)
+    return ret;
+
+  /* For now, we assume that any non-zero abi marker implies a signal frame.
+     This should get us pretty far.  */
+  ret = (sr.abi_marker != 0);
+
+  ia64_free_state_record (&sr);
+
+  return ret;
+}