1 // null-vectors.S - Stubs for Unused Vectors and Handlers
2 // $Id: //depot/rel/Cottonwood/Xtensa/OS/xtos/null-vectors.S#3 $
4 // Copyright (c) 2006-2010 Tensilica Inc.
6 // Permission is hereby granted, free of charge, to any person obtaining
7 // a copy of this software and associated documentation files (the
8 // "Software"), to deal in the Software without restriction, including
9 // without limitation the rights to use, copy, modify, merge, publish,
10 // distribute, sublicense, and/or sell copies of the Software, and to
11 // permit persons to whom the Software is furnished to do so, subject to
12 // the following conditions:
14 // The above copyright notice and this permission notice shall be included
15 // in all copies or substantial portions of the Software.
17 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
20 // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
21 // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
22 // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
23 // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 // NOTE: The simulator version of this file is currently not used,
27 // i.e. the SIMULATOR macro is never defined when assembling this file.
28 // The relevant simulator code is left here for illustrative purposes only.
31 #include <xtensa/coreasm.h>
32 #include "xtos-internal.h"
34 #include <xtensa/simcall.h>
37 // These are just tiny non-functional vectors and handlers for when
38 // their functionality is not being used. They just try to signal
39 // the debugger that an unhandled exception or interrupt occurred,
40 // and otherwise just spin in a loop.
42 // For interrupts levels above DEBUGLEVEL, lowering PS.INTLEVEL
43 // for break to work is tricky, and not always possible in a
44 // generic fashion without interfering with normal program execution.
45 // So for now we don't do it.
48 #if defined(__SPLIT__user)
50 # if XCHAL_HAVE_EXCEPTIONS
51 .begin literal_prefix .UserExceptionVector
52 .section .UserExceptionVector.text, "ax"
54 .global _UserExceptionVector
57 break 1, 1 // unexpected user-vectored general exception
59 1: j 1b // infinite loop - unexpected user-vectored exception
60 .size _UserExceptionVector, . - _UserExceptionVector
64 #elif defined(__SPLIT__level1int)
67 .global _xtos_l1int_handler
69 movi a3, _xtos_unhandled_exception
71 .size _xtos_l1int_handler, . - _xtos_l1int_handler
73 #elif defined(__SPLIT__level2)
75 # if (XCHAL_NUM_INTLEVELS >= 2) && (XCHAL_DEBUGLEVEL != 2)
76 .begin literal_prefix .Level2InterruptVector
77 .section .Level2InterruptVector.text, "ax"
81 # if XCHAL_HAVE_DEBUG && (XCHAL_DEBUGLEVEL > 2)
82 break 1, 2 // unexpected high-priority interrupt
83 # elif defined(SIMULATOR)
85 movi a2, SYS_unhandled_highpri_interrupt
86 simcall // let simulator/debugger report unhandled level-2 interrupt
88 1: j 1b // infinite loop - unexpected level-2 interrupt
89 .size _Level2Vector, . - _Level2Vector
95 #elif defined(__SPLIT__level3)
97 # if (XCHAL_NUM_INTLEVELS >= 3) && (XCHAL_DEBUGLEVEL != 3)
98 .begin literal_prefix .Level3InterruptVector
99 .section .Level3InterruptVector.text, "ax"
101 .global _Level3Vector
103 # if XCHAL_HAVE_DEBUG && (XCHAL_DEBUGLEVEL > 3)
104 break 1, 2 // unexpected high-priority interrupt
105 # elif defined(SIMULATOR)
107 movi a2, SYS_unhandled_highpri_interrupt
108 simcall // let simulator/debugger report unhandled level-3 interrupt
110 1: j 1b // infinite loop - unexpected level-3 interrupt
111 .size _Level3Vector, . - _Level3Vector
114 # endif /* level 3 */
117 #elif defined(__SPLIT__level4)
119 # if (XCHAL_NUM_INTLEVELS >= 4) && (XCHAL_DEBUGLEVEL != 4)
120 .begin literal_prefix .Level4InterruptVector
121 .section .Level4InterruptVector.text, "ax"
123 .global _Level4Vector
125 # if XCHAL_HAVE_DEBUG && (XCHAL_DEBUGLEVEL > 4)
126 break 1, 2 // unexpected high-priority interrupt
127 # elif defined(SIMULATOR)
129 movi a2, SYS_unhandled_highpri_interrupt
130 simcall // let simulator/debugger report unhandled level-4 interrupt
132 1: j 1b // infinite loop - unexpected level-4 interrupt
133 .size _Level4Vector, . - _Level4Vector
136 # endif /* level 4 */
139 #elif defined(__SPLIT__level5)
141 # if (XCHAL_NUM_INTLEVELS >= 5) && (XCHAL_DEBUGLEVEL != 5)
142 .begin literal_prefix .Level5InterruptVector
143 .section .Level5InterruptVector.text, "ax"
145 .global _Level5Vector
147 # if XCHAL_HAVE_DEBUG && (XCHAL_DEBUGLEVEL > 5)
148 break 1, 2 // unexpected high-priority interrupt
149 # elif defined(SIMULATOR)
151 movi a2, SYS_unhandled_highpri_interrupt
152 simcall // let simulator/debugger report unhandled level-5 interrupt
154 1: j 1b // infinite loop - unexpected level-5 interrupt
155 .size _Level5Vector, . - _Level5Vector
158 # endif /* level 5 */
161 #elif defined(__SPLIT__level6)
163 # if (XCHAL_NUM_INTLEVELS >= 6) && (XCHAL_DEBUGLEVEL != 6)
164 .begin literal_prefix .Level6InterruptVector
165 .section .Level6InterruptVector.text, "ax"
167 .global _Level6Vector
169 # if XCHAL_HAVE_DEBUG && (XCHAL_DEBUGLEVEL > 6)
170 break 1, 2 // unexpected high-priority interrupt
171 # elif defined(SIMULATOR)
173 movi a2, SYS_unhandled_highpri_interrupt
174 simcall // let simulator/debugger report unhandled level-6 interrupt
176 1: j 1b // infinite loop - unexpected level-6 interrupt
177 .size _Level6Vector, . - _Level6Vector
180 # endif /* level 6 */