// debug-vector.S -- Debug Exception Vector

// $Id: //depot/rel/Eaglenest/Xtensa/OS/xtos/debug-vector.S#2 $

// Copyright (c) 2003-2013 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 <arch/debug/gdb/xtensa-defs.h>

#include <xtensa/xtensa-versions.h>

#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:

isync_erratum453

#if ((defined(SIMULATOR) || \

(XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RE_2013_2)) \

&& !CONFIG_GDB_DEBUG) /* SIMCALL is NOP in hw? */

// In the simulator (ISS), let the debugger (if any is attached)

// handle the debug exception, else simply stop the simulation:

//

simcall // have ISS handle the debug exception

# endif

# if (!defined(SIMULATOR) && !CONFIG_GDB_DEBUG)

// 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:

// unexpected debug exception, loop in low-power mode

//waiti XCHAL_DEBUGLEVEL

j 1b // infinite loop - unexpected debug exception

# endif /*!SIMULATOR && !CONFIG_GDB_DEBUG*/

#if CONFIG_GDB_DEBUG

xsr a2, DEBUG_EXCSAVE

jx a2

#endif

.end literal_prefix

.size _DebugExceptionVector, . - _DebugExceptionVector

#endif /* XCHAL_HAVE_DEBUG && XCHAL_HAVE_EXCEPTIONS */