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diff --git a/sboot/magpie_1_1/sboot/athos/src/xtos/debug-vector.S b/sboot/magpie_1_1/sboot/athos/src/xtos/debug-vector.S
new file mode 100755
index 0000000..35fb1be
--- /dev/null
+++ b/sboot/magpie_1_1/sboot/athos/src/xtos/debug-vector.S
@@ -0,0 +1,65 @@
+// debug-vector.S  --  Debug Exception Vector
+// $Id: //depot/rel/Cottonwood/Xtensa/OS/xtos/debug-vector.S#3 $
+
+// Copyright (c) 2003-2004, 2006, 2010 Tensilica Inc.
+//
+// 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 <xtensa/coreasm.h>
+#include <xtensa/config/specreg.h>
+#ifdef SIMULATOR
+#include <xtensa/simcall.h>
+#endif
+
+#if XCHAL_HAVE_DEBUG && XCHAL_HAVE_EXCEPTIONS
+
+	//  This code goes at the debug exception vector
+
+	.begin	literal_prefix	.DebugExceptionVector
+	.section		.DebugExceptionVector.text, "ax"
+	.align 4
+	.global	_DebugExceptionVector
+_DebugExceptionVector:
+
+# ifdef SIMULATOR
+	//  In the simulator (ISS), let the debugger (if any is attached)
+	//  handle the debug exception, else simply stop the simulation:
+	//
+	wsr	a2, EXCSAVE+XCHAL_DEBUGLEVEL	// save a2 where simulator expects it
+	movi	a2, SYS_gdb_enter_sktloop
+	simcall					// have ISS handle the debug exception
+# else
+	//  For hardware, this code does not handle debug exceptions.
+	//  To implement a target-side debug monitor, replace this
+	//  vector with a real one that uses target-specific facilities
+	//  to communicate with the debugger.
+	//  
+1:
+#if XCHAL_HAVE_INTERRUPTS
+	waiti	XCHAL_DEBUGLEVEL	// unexpected debug exception, loop in low-power mode
+#endif
+	j	1b		// infinite loop - unexpected debug exception
+# endif /*!SIMULATOR*/
+
+	.end	literal_prefix
+	.size	_DebugExceptionVector, . - _DebugExceptionVector
+
+#endif /* XCHAL_HAVE_DEBUG && XCHAL_HAVE_EXCEPTIONS */
+