--- /dev/null
+// null-vectors.S - Stubs for Unused Vectors and Handlers
+// $Id: //depot/rel/Cottonwood/Xtensa/OS/xtos/null-vectors.S#3 $
+
+// Copyright (c) 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.
+
+
+// NOTE: The simulator version of this file is currently not used,
+// i.e. the SIMULATOR macro is never defined when assembling this file.
+// The relevant simulator code is left here for illustrative purposes only.
+
+
+#include <xtensa/coreasm.h>
+#include "xtos-internal.h"
+#ifdef SIMULATOR
+#include <xtensa/simcall.h>
+#endif
+
+ // These are just tiny non-functional vectors and handlers for when
+ // their functionality is not being used. They just try to signal
+ // the debugger that an unhandled exception or interrupt occurred,
+ // and otherwise just spin in a loop.
+ //
+ // For interrupts levels above DEBUGLEVEL, lowering PS.INTLEVEL
+ // for break to work is tricky, and not always possible in a
+ // generic fashion without interfering with normal program execution.
+ // So for now we don't do it.
+
+
+#if defined(__SPLIT__user)
+
+# if XCHAL_HAVE_EXCEPTIONS
+ .begin literal_prefix .UserExceptionVector
+ .section .UserExceptionVector.text, "ax"
+ .align 4
+ .global _UserExceptionVector
+_UserExceptionVector:
+# if XCHAL_HAVE_DEBUG
+ break 1, 1 // unexpected user-vectored general exception
+# endif
+1: j 1b // infinite loop - unexpected user-vectored exception
+ .size _UserExceptionVector, . - _UserExceptionVector
+ .end literal_prefix
+# endif
+
+#elif defined(__SPLIT__level1int)
+
+ .text
+ .global _xtos_l1int_handler
+_xtos_l1int_handler:
+ movi a3, _xtos_unhandled_exception
+ jx a3
+ .size _xtos_l1int_handler, . - _xtos_l1int_handler
+
+#elif defined(__SPLIT__level2)
+
+# if (XCHAL_NUM_INTLEVELS >= 2) && (XCHAL_DEBUGLEVEL != 2)
+ .begin literal_prefix .Level2InterruptVector
+ .section .Level2InterruptVector.text, "ax"
+ .align 4
+ .global _Level2Vector
+_Level2Vector:
+# if XCHAL_HAVE_DEBUG && (XCHAL_DEBUGLEVEL > 2)
+ break 1, 2 // unexpected high-priority interrupt
+# elif defined(SIMULATOR)
+ wsr a2, EXCSAVE_2
+ movi a2, SYS_unhandled_highpri_interrupt
+ simcall // let simulator/debugger report unhandled level-2 interrupt
+# endif
+1: j 1b // infinite loop - unexpected level-2 interrupt
+ .size _Level2Vector, . - _Level2Vector
+ .text
+ .end literal_prefix
+# endif /* level 2 */
+
+
+#elif defined(__SPLIT__level3)
+
+# if (XCHAL_NUM_INTLEVELS >= 3) && (XCHAL_DEBUGLEVEL != 3)
+ .begin literal_prefix .Level3InterruptVector
+ .section .Level3InterruptVector.text, "ax"
+ .align 4
+ .global _Level3Vector
+_Level3Vector:
+# if XCHAL_HAVE_DEBUG && (XCHAL_DEBUGLEVEL > 3)
+ break 1, 2 // unexpected high-priority interrupt
+# elif defined(SIMULATOR)
+ wsr a2, EXCSAVE_3
+ movi a2, SYS_unhandled_highpri_interrupt
+ simcall // let simulator/debugger report unhandled level-3 interrupt
+# endif
+1: j 1b // infinite loop - unexpected level-3 interrupt
+ .size _Level3Vector, . - _Level3Vector
+ .text
+ .end literal_prefix
+# endif /* level 3 */
+
+
+#elif defined(__SPLIT__level4)
+
+# if (XCHAL_NUM_INTLEVELS >= 4) && (XCHAL_DEBUGLEVEL != 4)
+ .begin literal_prefix .Level4InterruptVector
+ .section .Level4InterruptVector.text, "ax"
+ .align 4
+ .global _Level4Vector
+_Level4Vector:
+# if XCHAL_HAVE_DEBUG && (XCHAL_DEBUGLEVEL > 4)
+ break 1, 2 // unexpected high-priority interrupt
+# elif defined(SIMULATOR)
+ wsr a2, EXCSAVE_4
+ movi a2, SYS_unhandled_highpri_interrupt
+ simcall // let simulator/debugger report unhandled level-4 interrupt
+# endif
+1: j 1b // infinite loop - unexpected level-4 interrupt
+ .size _Level4Vector, . - _Level4Vector
+ .text
+ .end literal_prefix
+# endif /* level 4 */
+
+
+#elif defined(__SPLIT__level5)
+
+# if (XCHAL_NUM_INTLEVELS >= 5) && (XCHAL_DEBUGLEVEL != 5)
+ .begin literal_prefix .Level5InterruptVector
+ .section .Level5InterruptVector.text, "ax"
+ .align 4
+ .global _Level5Vector
+_Level5Vector:
+# if XCHAL_HAVE_DEBUG && (XCHAL_DEBUGLEVEL > 5)
+ break 1, 2 // unexpected high-priority interrupt
+# elif defined(SIMULATOR)
+ wsr a2, EXCSAVE_5
+ movi a2, SYS_unhandled_highpri_interrupt
+ simcall // let simulator/debugger report unhandled level-5 interrupt
+# endif
+1: j 1b // infinite loop - unexpected level-5 interrupt
+ .size _Level5Vector, . - _Level5Vector
+ .text
+ .end literal_prefix
+# endif /* level 5 */
+
+
+#elif defined(__SPLIT__level6)
+
+# if (XCHAL_NUM_INTLEVELS >= 6) && (XCHAL_DEBUGLEVEL != 6)
+ .begin literal_prefix .Level6InterruptVector
+ .section .Level6InterruptVector.text, "ax"
+ .align 4
+ .global _Level6Vector
+_Level6Vector:
+# if XCHAL_HAVE_DEBUG && (XCHAL_DEBUGLEVEL > 6)
+ break 1, 2 // unexpected high-priority interrupt
+# elif defined(SIMULATOR)
+ wsr a2, EXCSAVE_6
+ movi a2, SYS_unhandled_highpri_interrupt
+ simcall // let simulator/debugger report unhandled level-6 interrupt
+# endif
+1: j 1b // infinite loop - unexpected level-6 interrupt
+ .size _Level6Vector, . - _Level6Vector
+ .text
+ .end literal_prefix
+# endif /* level 6 */
+
+
+#endif /* split */
+
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