1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
|
/*
* FreeRTOS Kernel V10.4.0
* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* 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.
*
* http://www.FreeRTOS.org
* http://aws.amazon.com/freertos
*
* 1 tab == 4 spaces!
*/
/* Scheduler include files. */
#include "FreeRTOS.h"
#include "task.h"
/* Demo file headers. */
#include "regtest.h"
/* The minimum stack size required by a register test task.
*
* The value should be at least the sum of:
* - Number of bytes used to save register context.
* Refer to port.c, r0-r31 and/or RAMPZ and/or EIND.
* - Number of bytes used in nested function call.
* Refer to GCC Developer Option -fstack-usage.
*/
#define REGTEST_MIN_STACK_SIZE ( ( unsigned short ) 50 )
/*
* Test tasks that sets registers to known values, then checks to ensure the
* values remain as expected. Test 1 and test 2 use different values.
*/
static void prvRegisterCheck1( void *pvParameters );
static void prvRegisterCheck2( void *pvParameters );
/* Set to a none zero value should an error be found.
* Using two variables to identify offending task and register combination.
*/
UBaseType_t uxRegTestError1 = 0;
UBaseType_t uxRegTestError2 = 0;
/*-----------------------------------------------------------*/
void vStartRegTestTasks( void )
{
/* Create register check tasks with lowest priority. These tasks will be
* interrupted as much as possible by higher priority tasks. Thus if task
* context is not restored correctly, error is more likely to be caught.
*/
xTaskCreate( prvRegisterCheck1, "Reg1", REGTEST_MIN_STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL );
xTaskCreate( prvRegisterCheck2, "Reg2", REGTEST_MIN_STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL );
}
/*-----------------------------------------------------------*/
BaseType_t xAreRegTestTasksStillRunning( void )
{
BaseType_t xReturn;
/* If a register was found to contain an unexpected value then the
* uxRegTestError variable would have been set to a none zero value.
*
* This check guarantees no false positive, but does not guarantee test
* has actually run. Could have a counter to track how many times the loop
* has been entered and ensure that the number is monotonically incrementing.
* And then it'll subject to integer overflow issue. To make things simple
* straight forward, set a breakpoint at the end of the loop in prvRegisterCheck1()
* and prvRegisterCheck2(). Make sure both can be hit.
*/
if( uxRegTestError1 == 0 && uxRegTestError2 == 0 )
{
xReturn = pdTRUE;
}
else
{
xReturn = pdFALSE;
}
return xReturn;
}
/*-----------------------------------------------------------*/
static void prvRegisterCheck1( void *pvParameters )
{
( void ) pvParameters;
for( ;; )
{
/* Load register r0-r30 with known value.
* r31 is used to first load immediate value then copy into r0-15.
*
* LDI Rd,K
* Rd<--K (16 <= d <= 31, 0 <= K <= 255)
*/
asm( "LDI r31, 0x80" );
asm( "MOV r0, r31" );
asm( "LDI r31, 0x81" );
asm( "MOV r1, r31" );
asm( "LDI r31, 0x82" );
asm( "MOV r2, r31" );
asm( "LDI r31, 0x83" );
asm( "MOV r3, r31" );
asm( "LDI r31, 0x84" );
asm( "MOV r4, r31" );
asm( "LDI r31, 0x85" );
asm( "MOV r5, r31" );
asm( "LDI r31, 0x86" );
asm( "MOV r6, r31" );
asm( "LDI r31, 0x87" );
asm( "MOV r7, r31" );
asm( "LDI r31, 0x88" );
asm( "MOV r8, r31" );
asm( "LDI r31, 0x89" );
asm( "MOV r9, r31" );
asm( "LDI r31, 0x8A" );
asm( "MOV r10, r31" );
asm( "LDI r31, 0x8B" );
asm( "MOV r11, r31" );
asm( "LDI r31, 0x8C" );
asm( "MOV r12, r31" );
asm( "LDI r31, 0x8D" );
asm( "MOV r13, r31" );
asm( "LDI r31, 0x8E" );
asm( "MOV r14, r31" );
asm( "LDI r31, 0x8F" );
asm( "MOV r15, r31" );
asm( "LDI r16, 0x90" );
asm( "LDI r17, 0x91" );
asm( "LDI r18, 0x92" );
asm( "LDI r19, 0x93" );
asm( "LDI r20, 0x94" );
asm( "LDI r21, 0x95" );
asm( "LDI r22, 0x96" );
asm( "LDI r23, 0x97" );
asm( "LDI r24, 0x98" );
asm( "LDI r25, 0x99" );
asm( "LDI r26, 0x9A" );
asm( "LDI r27, 0x9B" );
asm( "LDI r28, 0x9C" );
asm( "LDI r29, 0x9D" );
asm( "LDI r30, 0x9E" );
/* Check whether register r0-30 still contain known good values.
* If not, update uxRegTestError1 with the unique value.
*/
asm( "LDI r31, 0x80" );
asm( "CPSE r31, r0" );
asm( "STS uxRegTestError1, r0" );
asm( "LDI r31, 0x81" );
asm( "CPSE r31, r1" );
asm( "STS uxRegTestError1, r1" );
asm( "LDI r31, 0x82" );
asm( "CPSE r31, r2" );
asm( "STS uxRegTestError1, r2" );
asm( "LDI r31, 0x83" );
asm( "CPSE r31, r3" );
asm( "STS uxRegTestError1, r3" );
asm( "LDI r31, 0x84" );
asm( "CPSE r31, r4" );
asm( "STS uxRegTestError1, r4" );
asm( "LDI r31, 0x85" );
asm( "CPSE r31, r5" );
asm( "STS uxRegTestError1, r5" );
asm( "LDI r31, 0x86" );
asm( "CPSE r31, r6" );
asm( "STS uxRegTestError1, r6" );
asm( "LDI r31, 0x87" );
asm( "CPSE r31, r7" );
asm( "STS uxRegTestError1, r7" );
asm( "LDI r31, 0x88" );
asm( "CPSE r31, r8" );
asm( "STS uxRegTestError1, r8" );
asm( "LDI r31, 0x89" );
asm( "CPSE r31, r9" );
asm( "STS uxRegTestError1, r9" );
asm( "LDI r31, 0x8A" );
asm( "CPSE r31, r10" );
asm( "STS uxRegTestError1, r10" );
asm( "LDI r31, 0x8B" );
asm( "CPSE r31, r11" );
asm( "STS uxRegTestError1, r11" );
asm( "LDI r31, 0x8C" );
asm( "CPSE r31, r12" );
asm( "STS uxRegTestError1, r12" );
asm( "LDI r31, 0x8D" );
asm( "CPSE r31, r13" );
asm( "STS uxRegTestError1, r13" );
asm( "LDI r31, 0x8E" );
asm( "CPSE r31, r14" );
asm( "STS uxRegTestError1, r14" );
asm( "LDI r31, 0x8F" );
asm( "CPSE r31, r15" );
asm( "STS uxRegTestError1, r15" );
asm( "LDI r31, 0x90" );
asm( "CPSE r31, r16" );
asm( "STS uxRegTestError1, r16" );
asm( "LDI r31, 0x91" );
asm( "CPSE r31, r17" );
asm( "STS uxRegTestError1, r17" );
asm( "LDI r31, 0x92" );
asm( "CPSE r31, r18" );
asm( "STS uxRegTestError1, r18" );
asm( "LDI r31, 0x93" );
asm( "CPSE r31, r19" );
asm( "STS uxRegTestError1, r19" );
asm( "LDI r31, 0x94" );
asm( "CPSE r31, r20" );
asm( "STS uxRegTestError1, r20" );
asm( "LDI r31, 0x95" );
asm( "CPSE r31, r21" );
asm( "STS uxRegTestError1, r21" );
asm( "LDI r31, 0x96" );
asm( "CPSE r31, r22" );
asm( "STS uxRegTestError1, r22" );
asm( "LDI r31, 0x97" );
asm( "CPSE r31, r23" );
asm( "STS uxRegTestError1, r23" );
asm( "LDI r31, 0x98" );
asm( "CPSE r31, r24" );
asm( "STS uxRegTestError1, r24" );
asm( "LDI r31, 0x99" );
asm( "CPSE r31, r25" );
asm( "STS uxRegTestError1, r25" );
asm( "LDI r31, 0x9A" );
asm( "CPSE r31, r26" );
asm( "STS uxRegTestError1, r26" );
asm( "LDI r31, 0x9B" );
asm( "CPSE r31, r27" );
asm( "STS uxRegTestError1, r27" );
asm( "LDI r31, 0x9C" );
asm( "CPSE r31, r28" );
asm( "STS uxRegTestError1, r28" );
asm( "LDI r31, 0x9D" );
asm( "CPSE r31, r29" );
asm( "STS uxRegTestError1, r29" );
asm( "LDI r31, 0x9E" );
asm( "CPSE r31, r30" );
asm( "STS uxRegTestError1, r30" );
/* Give other tasks of the same priority a chance to run. */
taskYIELD();
}
}
/*-----------------------------------------------------------*/
static void prvRegisterCheck2( void *pvParameters )
{
( void ) pvParameters;
for( ;; )
{
/* Load register r0-r30 with known value.
* r31 is used to first load immediate value then copy into r0-15.
*
* LDI Rd,K
* Rd<--K (16 <= d <= 31, 0 <= K <= 255)
*/
asm( "LDI r31, 0" );
asm( "MOV r0, r31" );
asm( "LDI r31, 1" );
asm( "MOV r1, r31" );
asm( "LDI r31, 2" );
asm( "MOV r2, r31" );
asm( "LDI r31, 3" );
asm( "MOV r3, r31" );
asm( "LDI r31, 4" );
asm( "MOV r4, r31" );
asm( "LDI r31, 5" );
asm( "MOV r5, r31" );
asm( "LDI r31, 6" );
asm( "MOV r6, r31" );
asm( "LDI r31, 7" );
asm( "MOV r7, r31" );
asm( "LDI r31, 8" );
asm( "MOV r8, r31" );
asm( "LDI r31, 9" );
asm( "MOV r9, r31" );
asm( "LDI r31, 10" );
asm( "MOV r10, r31" );
asm( "LDI r31, 11" );
asm( "MOV r11, r31" );
asm( "LDI r31, 12" );
asm( "MOV r12, r31" );
asm( "LDI r31, 13" );
asm( "MOV r13, r31" );
asm( "LDI r31, 14" );
asm( "MOV r14, r31" );
asm( "LDI r31, 15" );
asm( "MOV r15, r31" );
asm( "LDI r16, 16" );
asm( "LDI r17, 17" );
asm( "LDI r18, 18" );
asm( "LDI r19, 19" );
asm( "LDI r20, 20" );
asm( "LDI r21, 21" );
asm( "LDI r22, 22" );
asm( "LDI r23, 23" );
asm( "LDI r24, 24" );
asm( "LDI r25, 25" );
asm( "LDI r26, 26" );
asm( "LDI r27, 27" );
asm( "LDI r28, 28" );
asm( "LDI r29, 29" );
asm( "LDI r30, 30" );
/* Check whether register r0-30 still contain known good values.
* If not, update uxRegTestError2 with the unique value.
*/
asm( "LDI r31, 0" );
asm( "CPSE r31, r0" );
asm( "STS uxRegTestError2, r0" );
asm( "LDI r31, 1" );
asm( "CPSE r31, r1" );
asm( "STS uxRegTestError2, r1" );
asm( "LDI r31, 2" );
asm( "CPSE r31, r2" );
asm( "STS uxRegTestError2, r2" );
asm( "LDI r31, 3" );
asm( "CPSE r31, r3" );
asm( "STS uxRegTestError2, r3" );
asm( "LDI r31, 4" );
asm( "CPSE r31, r4" );
asm( "STS uxRegTestError2, r4" );
asm( "LDI r31, 5" );
asm( "CPSE r31, r5" );
asm( "STS uxRegTestError2, r5" );
asm( "LDI r31, 6" );
asm( "CPSE r31, r6" );
asm( "STS uxRegTestError2, r6" );
asm( "LDI r31, 7" );
asm( "CPSE r31, r7" );
asm( "STS uxRegTestError2, r7" );
asm( "LDI r31, 8" );
asm( "CPSE r31, r8" );
asm( "STS uxRegTestError2, r8" );
asm( "LDI r31, 9" );
asm( "CPSE r31, r9" );
asm( "STS uxRegTestError2, r9" );
asm( "LDI r31, 10" );
asm( "CPSE r31, r10" );
asm( "STS uxRegTestError2, r10" );
asm( "LDI r31, 11" );
asm( "CPSE r31, r11" );
asm( "STS uxRegTestError2, r11" );
asm( "LDI r31, 12" );
asm( "CPSE r31, r12" );
asm( "STS uxRegTestError2, r12" );
asm( "LDI r31, 13" );
asm( "CPSE r31, r13" );
asm( "STS uxRegTestError2, r13" );
asm( "LDI r31, 14" );
asm( "CPSE r31, r14" );
asm( "STS uxRegTestError2, r14" );
asm( "LDI r31, 15" );
asm( "CPSE r31, r15" );
asm( "STS uxRegTestError2, r15" );
asm( "LDI r31, 16" );
asm( "CPSE r31, r16" );
asm( "STS uxRegTestError2, r16" );
asm( "LDI r31, 17" );
asm( "CPSE r31, r17" );
asm( "STS uxRegTestError2, r17" );
asm( "LDI r31, 18" );
asm( "CPSE r31, r18" );
asm( "STS uxRegTestError2, r18" );
asm( "LDI r31, 19" );
asm( "CPSE r31, r19" );
asm( "STS uxRegTestError2, r19" );
asm( "LDI r31, 20" );
asm( "CPSE r31, r20" );
asm( "STS uxRegTestError2, r20" );
asm( "LDI r31, 21" );
asm( "CPSE r31, r21" );
asm( "STS uxRegTestError2, r21" );
asm( "LDI r31, 22" );
asm( "CPSE r31, r22" );
asm( "STS uxRegTestError2, r22" );
asm( "LDI r31, 23" );
asm( "CPSE r31, r23" );
asm( "STS uxRegTestError2, r23" );
asm( "LDI r31, 24" );
asm( "CPSE r31, r24" );
asm( "STS uxRegTestError2, r24" );
asm( "LDI r31, 25" );
asm( "CPSE r31, r25" );
asm( "STS uxRegTestError2, r25" );
asm( "LDI r31, 26" );
asm( "CPSE r31, r26" );
asm( "STS uxRegTestError2, r26" );
asm( "LDI r31, 27" );
asm( "CPSE r31, r27" );
asm( "STS uxRegTestError2, r27" );
asm( "LDI r31, 28" );
asm( "CPSE r31, r28" );
asm( "STS uxRegTestError2, r28" );
asm( "LDI r31, 29" );
asm( "CPSE r31, r29" );
asm( "STS uxRegTestError2, r29" );
asm( "LDI r31, 30" );
asm( "CPSE r31, r30" );
asm( "STS uxRegTestError2, r30" );
/* Give other tasks of the same priority a chance to run. */
taskYIELD();
}
}
|
