move sboot to the root directory

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

diff --git a/sboot/magpie_1_1/sboot/athos/src/xtos/exc-unhandled.S b/sboot/magpie_1_1/sboot/athos/src/xtos/exc-unhandled.S
new file mode 100755 (executable)
index 0000000..29723ea
--- /dev/null
+++ b/sboot/magpie_1_1/sboot/athos/src/xtos/exc-unhandled.S
@@ -0,0 +1,84 @@
+// exc-unhandled.S - General Exception Handler for unhandled exceptions
+
+// Copyright (c) 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.
+
+#include <xtensa/coreasm.h>
+#include <xtensa/corebits.h>
+#include <xtensa/config/specreg.h>
+#include "xtos-internal.h"
+#ifdef SIMULATOR
+#include <xtensa/simcall.h>
+#endif
+
+#if XCHAL_HAVE_EXCEPTIONS
+
+/*
+ *  Assembly-level exception handler used when no handler was
+ *  registered for the specific exception cause.
+ *
+ *  The BREAK instruction is used to give control to the debugger,
+ *  if one is present and active.  (If none is present and active,
+ *  the default debug exception handler will typically skip over
+ *  this break instruction.)
+ *  This code follows the convention documented in the ISA manual
+ *  to use BREAK instructions to signal unhandled exceptions to the
+ *  debugger.  For the debugger to report or handle this condition
+ *  in an OS-independent manner, all processor state (except PC)
+ *  must be restored as it was when the unhandled exception just
+ *  occurred (ie. as it was at the beginning of the vector).
+ *  If execution continues after the BREAK instruction (in which
+ *  case any register might have been modified by the debugger),
+ *  just return.
+ */
+       .text
+       .align 4 
+
+       // If not pulled-in some other way, define it as unhandled:
+       .weak   _xtos_cause3_handler
+       .global _xtos_cause3_handler
+_xtos_cause3_handler:
+
+       .global _xtos_unhandled_exception
+_xtos_unhandled_exception:
+#if XCHAL_HAVE_DEBUG || defined(SIMULATOR)
+       l32i    a2, a1, UEXC_a2         // restore a2
+       l32i    a3, a1, UEXC_a3         // restore a3
+       //  Note:  a4-a5 not clobbered, no need to restore.
+       addi    a1, a1, ESF_TOTALSIZE   // restore sp
+# if XCHAL_HAVE_DEBUG
+       break   1, 1                    // give control to the debugger (if any present)
+# else
+       wsr     a2, EXCSAVE1            // save a2 where simulator expects it
+       movi    a2, SYS_unhandled_user_exc
+       simcall                         // let simulator/debugger report unhandled exception
+       rsr     a2, EXCSAVE1            // restore a2
+# endif
+       rfe_rfue                        // if sim/debug resume, just return
+#else /* DEBUG or SIMULATOR */
+       j       _xtos_unhandled_exception       // just loop forever
+#endif /* DEBUG or SIMULATOR */
+
+       .size   _xtos_unhandled_exception, . - _xtos_unhandled_exception
+
+
+#endif /* XCHAL_HAVE_EXCEPTIONS */
+