--- /dev/null
+// interrupt-table.S - Interrupt handler table and default handler
+
+// Copyright (c) 2004-2010 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>
+#include "xtos-internal.h"
+#ifdef SIMULATOR
+#include <xtensa/simcall.h>
+#endif
+
+
+#if XCHAL_HAVE_INTERRUPTS
+
+ .data
+
+ .global _xtos_intstruct
+ .align 8
+_xtos_intstruct:
+# if XTOS_VIRTUAL_INTENABLE
+ .global _xtos_enabled
+ .type _xtos_enabled,@object
+ .size _xtos_enabled,4
+ .global _xtos_vpri_enabled
+ .type _xtos_vpri_enabled,@object
+ .size _xtos_vpri_enabled,4
+_xtos_enabled: .word 0
+_xtos_vpri_enabled: .word 0xFFFFFFFF
+# endif
+# if XTOS_VIRTUAL_INTERRUPT
+# error Virtualized INTERRUPT register not yet supported.
+ .global _xtos_pending
+ .type _xtos_pending,@object
+ .size _xtos_pending,4
+_xtos_pending: .word 0
+# endif
+
+ /*
+ * Table of C-level interrupt handlers (and args, etc) for each interrupt.
+ * NOTE: if the NSA/NSAU instructions are configured, then to save a few
+ * cycles in the interrupt dispatcher code, this table is filled in reverse.
+ * C code uses the MAPINT() macro defined in xtos-internal.h to index entries.
+ * NOTE: Under some conditions (turned off by default in xtos-params.h),
+ * this table gets properly initialized by the _xtos_init() function in
+ * init.c . NOTA: A future enhancement may be to always configure
+ * and build this table at build-time rather than ever doing it at run-time.
+ */
+#define i .Li /* workaround a silly GDB testsuite regression */
+ .data
+ .global _xtos_interrupt_table
+ .align 8
+_xtos_interrupt_table:
+ .set i, XCHAL_HAVE_NSA*(XCHAL_NUM_INTERRUPTS-1)
+ .rept XCHAL_NUM_INTERRUPTS
+ .word _xtos_unhandled_interrupt
+ .word i // parameter: interrupt number
+ .set i, i+1-(XCHAL_HAVE_NSA*2)
+ .endr
+
+# if XIE_EXTEND
+ /* MUST *IMMEDIATELY* follow _xtos_interrupt_table: */
+ .global _xtos_interrupt_mask_table
+_xtos_interrupt_mask_table:
+ .set i, XCHAL_HAVE_NSA*(XCHAL_NUM_INTERRUPTS-1)
+ .rept XCHAL_NUM_INTERRUPTS
+ /* Default to all low-priority (level-one) interrupts at their own virtual priority: */
+# if XTOS_SUBPRI_ORDER == XTOS_SPO_ZERO_HI
+ .word ((1<<i)-1) | ~XCHAL_LOWPRI_MASK // vpri_mask default - lower-numbered ints (and high/medium-pri ints) pre-empt other low-pri ints
+# else
+ .word (-2*(1<<i)) | ~XCHAL_LOWPRI_MASK // vpri_mask default - higher-numbered ints (and high/medium-pri ints) pre-empt other low-pri ints
+# endif
+ .word (1<<i) // level_mask default - each low-pri (level-one) interrupt at its own subpriority
+ .set i, i+1-(XCHAL_HAVE_NSA*2)
+ .endr
+# endif /*XIE_EXTEND*/
+
+#endif /* XCHAL_HAVE_INTERRUPTS */
+
+ .text
+
+
+
+#if XCHAL_HAVE_INTERRUPTS
+
+ //
+ // void _xtos_unhandled_interrupt( int n );
+ //
+ // Default/empty interrupt handler.
+ // This is used for interrupts with no registered handler.
+ // Parameter n is the interrupt number (0 thru 31).
+ //
+ .text
+ .align 4
+ .global _xtos_unhandled_interrupt
+ .type _xtos_unhandled_interrupt,@function
+_xtos_unhandled_interrupt:
+ abi_entry
+# if XCHAL_HAVE_DEBUG
+ // Break into the debugger if one is present and active:
+# if XCHAL_NUM_INTLEVELS > XCHAL_DEBUGLEVEL
+ rsil a3, XCHAL_DEBUGLEVEL-1 // ensure break takes effect
+# endif
+ break 1, 15 // unhandled (unregistered) interrupt $a2
+//# elif defined(SIMULATOR)
+// addmi a2, a2, SYS_unhandled_interrupt ...
+// simcall // unhandled interrupt
+# else
+1: j 1b // unhandled interrupt - loop forever
+# endif
+ abi_return
+
+ .size _xtos_unhandled_interrupt, . - _xtos_unhandled_interrupt
+
+#endif /* XCHAL_HAVE_INTERRUPTS */
+
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