move sboot to the root directory

[open-ath9k-htc-firmware.git] / sboot / magpie_1_1 / sboot / athos / src / xtos / kernel-vector.S

diff --git a/sboot/magpie_1_1/sboot/athos/src/xtos/kernel-vector.S b/sboot/magpie_1_1/sboot/athos/src/xtos/kernel-vector.S
new file mode 100755 (executable)
index 0000000..0501821
--- /dev/null
+++ b/sboot/magpie_1_1/sboot/athos/src/xtos/kernel-vector.S
@@ -0,0 +1,72 @@
+// kernel-vector.S  -  Kernel Vector for General Exceptions
+// $Id: //depot/rel/Cottonwood/Xtensa/OS/xtos/kernel-vector.S#3 $
+
+// Copyright (c) 1999-2002, 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.
+
+/*
+ *  General exceptions in kernel vector mode (PS.UM==0) go to this kernel
+ *  vector.  This kernel vector does very little.
+ *  Under normal operation of the single-threaded runtime ("XTOS"), kernel
+ *  vectored general exceptions do not occur, so nothing needs to be done.
+ *  However when debugging, such as when writing exception and
+ *  interrupt handlers, kernel vectored exceptions may occur.
+ *  They are usually the sign of a bug, so here we take a breakpoint
+ *  (if debug option enabled) or take drastic action (infinite loop)
+ *  otherwise.
+ *
+ *  XTOS does not allow exceptions in interrupt or exception handlers.
+ *  If it did, a more elaborate kernel vector handler would be needed.
+ *  See the Xtensa Microprocessor Programmer's Guide for an
+ *  example of how to implement such a kernel vector handler.
+ */
+
+#include <xtensa/coreasm.h>
+#include <xtensa/config/system.h>
+#ifdef SIMULATOR
+#include <xtensa/simcall.h>
+#endif
+
+#if XCHAL_HAVE_EXCEPTIONS
+
+       .begin  literal_prefix  .KernelExceptionVector
+       .section                .KernelExceptionVector.text, "ax"
+
+       .align 4
+       .global _KernelExceptionVector
+_KernelExceptionVector:
+# if XCHAL_HAVE_DEBUG
+1:     break   1,0                     // unexpected kernel exception
+# elif defined(SIMULATOR)
+       wsr     a2, EXCSAVE1            // save a2 where simulator expects it
+       movi    a2, SYS_unhandled_kernel_exc
+1:     simcall                         // let simulator/debugger report unhandled exception
+# else
+1:
+# endif
+       j       1b                      // infinite loop - unexpected kernel exception
+
+       .size   _KernelExceptionVector, . - _KernelExceptionVector
+       .text
+       .end    literal_prefix
+
+#endif /* XCHAL_HAVE_EXCEPTIONS */
+