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rtos: support gdb_get_register_packet
[openocd.git] / src / rtos / FreeRTOS.c
1 /***************************************************************************
2 * Copyright (C) 2011 by Broadcom Corporation *
3 * Evan Hunter - ehunter@broadcom.com *
4 * *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 * *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
14 * *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program. If not, see <http://www.gnu.org/licenses/>. *
17 ***************************************************************************/
18
19 #ifdef HAVE_CONFIG_H
20 #include "config.h"
21 #endif
22
23 #include <helper/time_support.h>
24 #include <jtag/jtag.h>
25 #include "target/target.h"
26 #include "target/target_type.h"
27 #include "rtos.h"
28 #include "helper/log.h"
29 #include "helper/types.h"
30 #include "rtos_standard_stackings.h"
31 #include "target/armv7m.h"
32 #include "target/cortex_m.h"
33
34
35
36 #define FREERTOS_MAX_PRIORITIES 63
37
38 #define FreeRTOS_STRUCT(int_type, ptr_type, list_prev_offset)
39
40 struct FreeRTOS_params {
41 const char *target_name;
42 const unsigned char thread_count_width;
43 const unsigned char pointer_width;
44 const unsigned char list_next_offset;
45 const unsigned char list_width;
46 const unsigned char list_elem_next_offset;
47 const unsigned char list_elem_content_offset;
48 const unsigned char thread_stack_offset;
49 const unsigned char thread_name_offset;
50 const struct rtos_register_stacking *stacking_info_cm3;
51 const struct rtos_register_stacking *stacking_info_cm4f;
52 const struct rtos_register_stacking *stacking_info_cm4f_fpu;
53 };
54
55 static const struct FreeRTOS_params FreeRTOS_params_list[] = {
56 {
57 "cortex_m", /* target_name */
58 4, /* thread_count_width; */
59 4, /* pointer_width; */
60 16, /* list_next_offset; */
61 20, /* list_width; */
62 8, /* list_elem_next_offset; */
63 12, /* list_elem_content_offset */
64 0, /* thread_stack_offset; */
65 52, /* thread_name_offset; */
66 &rtos_standard_Cortex_M3_stacking, /* stacking_info */
67 &rtos_standard_Cortex_M4F_stacking,
68 &rtos_standard_Cortex_M4F_FPU_stacking,
69 },
70 {
71 "hla_target", /* target_name */
72 4, /* thread_count_width; */
73 4, /* pointer_width; */
74 16, /* list_next_offset; */
75 20, /* list_width; */
76 8, /* list_elem_next_offset; */
77 12, /* list_elem_content_offset */
78 0, /* thread_stack_offset; */
79 52, /* thread_name_offset; */
80 &rtos_standard_Cortex_M3_stacking, /* stacking_info */
81 &rtos_standard_Cortex_M4F_stacking,
82 &rtos_standard_Cortex_M4F_FPU_stacking,
83 },
84 {
85 "nds32_v3", /* target_name */
86 4, /* thread_count_width; */
87 4, /* pointer_width; */
88 16, /* list_next_offset; */
89 20, /* list_width; */
90 8, /* list_elem_next_offset; */
91 12, /* list_elem_content_offset */
92 0, /* thread_stack_offset; */
93 52, /* thread_name_offset; */
94 &rtos_standard_NDS32_N1068_stacking, /* stacking_info */
95 &rtos_standard_Cortex_M4F_stacking,
96 &rtos_standard_Cortex_M4F_FPU_stacking,
97 },
98 };
99
100 #define FREERTOS_NUM_PARAMS ((int)(sizeof(FreeRTOS_params_list)/sizeof(struct FreeRTOS_params)))
101
102 static bool FreeRTOS_detect_rtos(struct target *target);
103 static int FreeRTOS_create(struct target *target);
104 static int FreeRTOS_update_threads(struct rtos *rtos);
105 static int FreeRTOS_get_thread_reg_list(struct rtos *rtos, int64_t thread_id,
106 struct rtos_reg **reg_list, int *num_regs);
107 static int FreeRTOS_get_symbol_list_to_lookup(symbol_table_elem_t *symbol_list[]);
108
109 struct rtos_type FreeRTOS_rtos = {
110 .name = "FreeRTOS",
111
112 .detect_rtos = FreeRTOS_detect_rtos,
113 .create = FreeRTOS_create,
114 .update_threads = FreeRTOS_update_threads,
115 .get_thread_reg_list = FreeRTOS_get_thread_reg_list,
116 .get_symbol_list_to_lookup = FreeRTOS_get_symbol_list_to_lookup,
117 };
118
119 enum FreeRTOS_symbol_values {
120 FreeRTOS_VAL_pxCurrentTCB = 0,
121 FreeRTOS_VAL_pxReadyTasksLists = 1,
122 FreeRTOS_VAL_xDelayedTaskList1 = 2,
123 FreeRTOS_VAL_xDelayedTaskList2 = 3,
124 FreeRTOS_VAL_pxDelayedTaskList = 4,
125 FreeRTOS_VAL_pxOverflowDelayedTaskList = 5,
126 FreeRTOS_VAL_xPendingReadyList = 6,
127 FreeRTOS_VAL_xTasksWaitingTermination = 7,
128 FreeRTOS_VAL_xSuspendedTaskList = 8,
129 FreeRTOS_VAL_uxCurrentNumberOfTasks = 9,
130 FreeRTOS_VAL_uxTopUsedPriority = 10,
131 };
132
133 struct symbols {
134 const char *name;
135 bool optional;
136 };
137
138 static const struct symbols FreeRTOS_symbol_list[] = {
139 { "pxCurrentTCB", false },
140 { "pxReadyTasksLists", false },
141 { "xDelayedTaskList1", false },
142 { "xDelayedTaskList2", false },
143 { "pxDelayedTaskList", false },
144 { "pxOverflowDelayedTaskList", false },
145 { "xPendingReadyList", false },
146 { "xTasksWaitingTermination", true }, /* Only if INCLUDE_vTaskDelete */
147 { "xSuspendedTaskList", true }, /* Only if INCLUDE_vTaskSuspend */
148 { "uxCurrentNumberOfTasks", false },
149 { "uxTopUsedPriority", true }, /* Unavailable since v7.5.3 */
150 { NULL, false }
151 };
152
153 /* TODO: */
154 /* this is not safe for little endian yet */
155 /* may be problems reading if sizes are not 32 bit long integers. */
156 /* test mallocs for failure */
157
158 static int FreeRTOS_update_threads(struct rtos *rtos)
159 {
160 int i = 0;
161 int retval;
162 int tasks_found = 0;
163 const struct FreeRTOS_params *param;
164
165 if (rtos->rtos_specific_params == NULL)
166 return -1;
167
168 param = (const struct FreeRTOS_params *) rtos->rtos_specific_params;
169
170 if (rtos->symbols == NULL) {
171 LOG_ERROR("No symbols for FreeRTOS");
172 return -3;
173 }
174
175 if (rtos->symbols[FreeRTOS_VAL_uxCurrentNumberOfTasks].address == 0) {
176 LOG_ERROR("Don't have the number of threads in FreeRTOS");
177 return -2;
178 }
179
180 int thread_list_size = 0;
181 retval = target_read_buffer(rtos->target,
182 rtos->symbols[FreeRTOS_VAL_uxCurrentNumberOfTasks].address,
183 param->thread_count_width,
184 (uint8_t *)&thread_list_size);
185 LOG_DEBUG("FreeRTOS: Read uxCurrentNumberOfTasks at 0x%" PRIx64 ", value %d\r\n",
186 rtos->symbols[FreeRTOS_VAL_uxCurrentNumberOfTasks].address,
187 thread_list_size);
188
189 if (retval != ERROR_OK) {
190 LOG_ERROR("Could not read FreeRTOS thread count from target");
191 return retval;
192 }
193
194 /* wipe out previous thread details if any */
195 rtos_free_threadlist(rtos);
196
197 /* read the current thread */
198 retval = target_read_buffer(rtos->target,
199 rtos->symbols[FreeRTOS_VAL_pxCurrentTCB].address,
200 param->pointer_width,
201 (uint8_t *)&rtos->current_thread);
202 if (retval != ERROR_OK) {
203 LOG_ERROR("Error reading current thread in FreeRTOS thread list");
204 return retval;
205 }
206 LOG_DEBUG("FreeRTOS: Read pxCurrentTCB at 0x%" PRIx64 ", value 0x%" PRIx64 "\r\n",
207 rtos->symbols[FreeRTOS_VAL_pxCurrentTCB].address,
208 rtos->current_thread);
209
210 if ((thread_list_size == 0) || (rtos->current_thread == 0)) {
211 /* Either : No RTOS threads - there is always at least the current execution though */
212 /* OR : No current thread - all threads suspended - show the current execution
213 * of idling */
214 char tmp_str[] = "Current Execution";
215 thread_list_size++;
216 tasks_found++;
217 rtos->thread_details = malloc(
218 sizeof(struct thread_detail) * thread_list_size);
219 if (!rtos->thread_details) {
220 LOG_ERROR("Error allocating memory for %d threads", thread_list_size);
221 return ERROR_FAIL;
222 }
223 rtos->thread_details->threadid = 1;
224 rtos->thread_details->exists = true;
225 rtos->thread_details->extra_info_str = NULL;
226 rtos->thread_details->thread_name_str = malloc(sizeof(tmp_str));
227 strcpy(rtos->thread_details->thread_name_str, tmp_str);
228
229 if (thread_list_size == 1) {
230 rtos->thread_count = 1;
231 return ERROR_OK;
232 }
233 } else {
234 /* create space for new thread details */
235 rtos->thread_details = malloc(
236 sizeof(struct thread_detail) * thread_list_size);
237 if (!rtos->thread_details) {
238 LOG_ERROR("Error allocating memory for %d threads", thread_list_size);
239 return ERROR_FAIL;
240 }
241 }
242
243 /* Find out how many lists are needed to be read from pxReadyTasksLists, */
244 if (rtos->symbols[FreeRTOS_VAL_uxTopUsedPriority].address == 0) {
245 LOG_ERROR("FreeRTOS: uxTopUsedPriority is not defined, consult the OpenOCD manual for a work-around");
246 return ERROR_FAIL;
247 }
248 int64_t max_used_priority = 0;
249 retval = target_read_buffer(rtos->target,
250 rtos->symbols[FreeRTOS_VAL_uxTopUsedPriority].address,
251 param->pointer_width,
252 (uint8_t *)&max_used_priority);
253 if (retval != ERROR_OK)
254 return retval;
255 LOG_DEBUG("FreeRTOS: Read uxTopUsedPriority at 0x%" PRIx64 ", value %" PRId64 "\r\n",
256 rtos->symbols[FreeRTOS_VAL_uxTopUsedPriority].address,
257 max_used_priority);
258 if (max_used_priority > FREERTOS_MAX_PRIORITIES) {
259 LOG_ERROR("FreeRTOS maximum used priority is unreasonably big, not proceeding: %" PRId64 "",
260 max_used_priority);
261 return ERROR_FAIL;
262 }
263
264 symbol_address_t *list_of_lists =
265 malloc(sizeof(symbol_address_t) *
266 (max_used_priority+1 + 5));
267 if (!list_of_lists) {
268 LOG_ERROR("Error allocating memory for %" PRId64 " priorities", max_used_priority);
269 return ERROR_FAIL;
270 }
271
272 int num_lists;
273 for (num_lists = 0; num_lists <= max_used_priority; num_lists++)
274 list_of_lists[num_lists] = rtos->symbols[FreeRTOS_VAL_pxReadyTasksLists].address +
275 num_lists * param->list_width;
276
277 list_of_lists[num_lists++] = rtos->symbols[FreeRTOS_VAL_xDelayedTaskList1].address;
278 list_of_lists[num_lists++] = rtos->symbols[FreeRTOS_VAL_xDelayedTaskList2].address;
279 list_of_lists[num_lists++] = rtos->symbols[FreeRTOS_VAL_xPendingReadyList].address;
280 list_of_lists[num_lists++] = rtos->symbols[FreeRTOS_VAL_xSuspendedTaskList].address;
281 list_of_lists[num_lists++] = rtos->symbols[FreeRTOS_VAL_xTasksWaitingTermination].address;
282
283 for (i = 0; i < num_lists; i++) {
284 if (list_of_lists[i] == 0)
285 continue;
286
287 /* Read the number of threads in this list */
288 int64_t list_thread_count = 0;
289 retval = target_read_buffer(rtos->target,
290 list_of_lists[i],
291 param->thread_count_width,
292 (uint8_t *)&list_thread_count);
293 if (retval != ERROR_OK) {
294 LOG_ERROR("Error reading number of threads in FreeRTOS thread list");
295 free(list_of_lists);
296 return retval;
297 }
298 LOG_DEBUG("FreeRTOS: Read thread count for list %d at 0x%" PRIx64 ", value %" PRId64 "\r\n",
299 i, list_of_lists[i], list_thread_count);
300
301 if (list_thread_count == 0)
302 continue;
303
304 /* Read the location of first list item */
305 uint64_t prev_list_elem_ptr = -1;
306 uint64_t list_elem_ptr = 0;
307 retval = target_read_buffer(rtos->target,
308 list_of_lists[i] + param->list_next_offset,
309 param->pointer_width,
310 (uint8_t *)&list_elem_ptr);
311 if (retval != ERROR_OK) {
312 LOG_ERROR("Error reading first thread item location in FreeRTOS thread list");
313 free(list_of_lists);
314 return retval;
315 }
316 LOG_DEBUG("FreeRTOS: Read first item for list %d at 0x%" PRIx64 ", value 0x%" PRIx64 "\r\n",
317 i, list_of_lists[i] + param->list_next_offset, list_elem_ptr);
318
319 while ((list_thread_count > 0) && (list_elem_ptr != 0) &&
320 (list_elem_ptr != prev_list_elem_ptr) &&
321 (tasks_found < thread_list_size)) {
322 /* Get the location of the thread structure. */
323 rtos->thread_details[tasks_found].threadid = 0;
324 retval = target_read_buffer(rtos->target,
325 list_elem_ptr + param->list_elem_content_offset,
326 param->pointer_width,
327 (uint8_t *)&(rtos->thread_details[tasks_found].threadid));
328 if (retval != ERROR_OK) {
329 LOG_ERROR("Error reading thread list item object in FreeRTOS thread list");
330 free(list_of_lists);
331 return retval;
332 }
333 LOG_DEBUG("FreeRTOS: Read Thread ID at 0x%" PRIx64 ", value 0x%" PRIx64 "\r\n",
334 list_elem_ptr + param->list_elem_content_offset,
335 rtos->thread_details[tasks_found].threadid);
336
337 /* get thread name */
338
339 #define FREERTOS_THREAD_NAME_STR_SIZE (200)
340 char tmp_str[FREERTOS_THREAD_NAME_STR_SIZE];
341
342 /* Read the thread name */
343 retval = target_read_buffer(rtos->target,
344 rtos->thread_details[tasks_found].threadid + param->thread_name_offset,
345 FREERTOS_THREAD_NAME_STR_SIZE,
346 (uint8_t *)&tmp_str);
347 if (retval != ERROR_OK) {
348 LOG_ERROR("Error reading first thread item location in FreeRTOS thread list");
349 free(list_of_lists);
350 return retval;
351 }
352 tmp_str[FREERTOS_THREAD_NAME_STR_SIZE-1] = '\x00';
353 LOG_DEBUG("FreeRTOS: Read Thread Name at 0x%" PRIx64 ", value \"%s\"\r\n",
354 rtos->thread_details[tasks_found].threadid + param->thread_name_offset,
355 tmp_str);
356
357 if (tmp_str[0] == '\x00')
358 strcpy(tmp_str, "No Name");
359
360 rtos->thread_details[tasks_found].thread_name_str =
361 malloc(strlen(tmp_str)+1);
362 strcpy(rtos->thread_details[tasks_found].thread_name_str, tmp_str);
363 rtos->thread_details[tasks_found].exists = true;
364
365 if (rtos->thread_details[tasks_found].threadid == rtos->current_thread) {
366 char running_str[] = "State: Running";
367 rtos->thread_details[tasks_found].extra_info_str = malloc(
368 sizeof(running_str));
369 strcpy(rtos->thread_details[tasks_found].extra_info_str,
370 running_str);
371 } else
372 rtos->thread_details[tasks_found].extra_info_str = NULL;
373
374 tasks_found++;
375 list_thread_count--;
376
377 prev_list_elem_ptr = list_elem_ptr;
378 list_elem_ptr = 0;
379 retval = target_read_buffer(rtos->target,
380 prev_list_elem_ptr + param->list_elem_next_offset,
381 param->pointer_width,
382 (uint8_t *)&list_elem_ptr);
383 if (retval != ERROR_OK) {
384 LOG_ERROR("Error reading next thread item location in FreeRTOS thread list");
385 free(list_of_lists);
386 return retval;
387 }
388 LOG_DEBUG("FreeRTOS: Read next thread location at 0x%" PRIx64 ", value 0x%" PRIx64 "\r\n",
389 prev_list_elem_ptr + param->list_elem_next_offset,
390 list_elem_ptr);
391 }
392 }
393
394 free(list_of_lists);
395 rtos->thread_count = tasks_found;
396 return 0;
397 }
398
399 static int FreeRTOS_get_thread_reg_list(struct rtos *rtos, int64_t thread_id,
400 struct rtos_reg **reg_list, int *num_regs)
401 {
402 int retval;
403 const struct FreeRTOS_params *param;
404 int64_t stack_ptr = 0;
405
406 if (rtos == NULL)
407 return -1;
408
409 if (thread_id == 0)
410 return -2;
411
412 if (rtos->rtos_specific_params == NULL)
413 return -1;
414
415 param = (const struct FreeRTOS_params *) rtos->rtos_specific_params;
416
417 /* Read the stack pointer */
418 retval = target_read_buffer(rtos->target,
419 thread_id + param->thread_stack_offset,
420 param->pointer_width,
421 (uint8_t *)&stack_ptr);
422 if (retval != ERROR_OK) {
423 LOG_ERROR("Error reading stack frame from FreeRTOS thread");
424 return retval;
425 }
426 LOG_DEBUG("FreeRTOS: Read stack pointer at 0x%" PRIx64 ", value 0x%" PRIx64 "\r\n",
427 thread_id + param->thread_stack_offset,
428 stack_ptr);
429
430 /* Check for armv7m with *enabled* FPU, i.e. a Cortex-M4F */
431 int cm4_fpu_enabled = 0;
432 struct armv7m_common *armv7m_target = target_to_armv7m(rtos->target);
433 if (is_armv7m(armv7m_target)) {
434 if (armv7m_target->fp_feature == FPv4_SP) {
435 /* Found ARM v7m target which includes a FPU */
436 uint32_t cpacr;
437
438 retval = target_read_u32(rtos->target, FPU_CPACR, &cpacr);
439 if (retval != ERROR_OK) {
440 LOG_ERROR("Could not read CPACR register to check FPU state");
441 return -1;
442 }
443
444 /* Check if CP10 and CP11 are set to full access. */
445 if (cpacr & 0x00F00000) {
446 /* Found target with enabled FPU */
447 cm4_fpu_enabled = 1;
448 }
449 }
450 }
451
452 if (cm4_fpu_enabled == 1) {
453 /* Read the LR to decide between stacking with or without FPU */
454 uint32_t LR_svc = 0;
455 retval = target_read_buffer(rtos->target,
456 stack_ptr + 0x20,
457 param->pointer_width,
458 (uint8_t *)&LR_svc);
459 if (retval != ERROR_OK) {
460 LOG_OUTPUT("Error reading stack frame from FreeRTOS thread\r\n");
461 return retval;
462 }
463 if ((LR_svc & 0x10) == 0)
464 return rtos_generic_stack_read(rtos->target, param->stacking_info_cm4f_fpu, stack_ptr, reg_list, num_regs);
465 else
466 return rtos_generic_stack_read(rtos->target, param->stacking_info_cm4f, stack_ptr, reg_list, num_regs);
467 } else
468 return rtos_generic_stack_read(rtos->target, param->stacking_info_cm3, stack_ptr, reg_list, num_regs);
469 }
470
471 static int FreeRTOS_get_symbol_list_to_lookup(symbol_table_elem_t *symbol_list[])
472 {
473 unsigned int i;
474 *symbol_list = calloc(
475 ARRAY_SIZE(FreeRTOS_symbol_list), sizeof(symbol_table_elem_t));
476
477 for (i = 0; i < ARRAY_SIZE(FreeRTOS_symbol_list); i++) {
478 (*symbol_list)[i].symbol_name = FreeRTOS_symbol_list[i].name;
479 (*symbol_list)[i].optional = FreeRTOS_symbol_list[i].optional;
480 }
481
482 return 0;
483 }
484
485 #if 0
486
487 static int FreeRTOS_set_current_thread(struct rtos *rtos, threadid_t thread_id)
488 {
489 return 0;
490 }
491
492 static int FreeRTOS_get_thread_ascii_info(struct rtos *rtos, threadid_t thread_id, char **info)
493 {
494 int retval;
495 const struct FreeRTOS_params *param;
496
497 if (rtos == NULL)
498 return -1;
499
500 if (thread_id == 0)
501 return -2;
502
503 if (rtos->rtos_specific_params == NULL)
504 return -3;
505
506 param = (const struct FreeRTOS_params *) rtos->rtos_specific_params;
507
508 #define FREERTOS_THREAD_NAME_STR_SIZE (200)
509 char tmp_str[FREERTOS_THREAD_NAME_STR_SIZE];
510
511 /* Read the thread name */
512 retval = target_read_buffer(rtos->target,
513 thread_id + param->thread_name_offset,
514 FREERTOS_THREAD_NAME_STR_SIZE,
515 (uint8_t *)&tmp_str);
516 if (retval != ERROR_OK) {
517 LOG_ERROR("Error reading first thread item location in FreeRTOS thread list");
518 return retval;
519 }
520 tmp_str[FREERTOS_THREAD_NAME_STR_SIZE-1] = '\x00';
521
522 if (tmp_str[0] == '\x00')
523 strcpy(tmp_str, "No Name");
524
525 *info = malloc(strlen(tmp_str)+1);
526 strcpy(*info, tmp_str);
527 return 0;
528 }
529
530 #endif
531
532 static bool FreeRTOS_detect_rtos(struct target *target)
533 {
534 if ((target->rtos->symbols != NULL) &&
535 (target->rtos->symbols[FreeRTOS_VAL_pxReadyTasksLists].address != 0)) {
536 /* looks like FreeRTOS */
537 return true;
538 }
539 return false;
540 }
541
542 static int FreeRTOS_create(struct target *target)
543 {
544 int i = 0;
545 while ((i < FREERTOS_NUM_PARAMS) &&
546 (0 != strcmp(FreeRTOS_params_list[i].target_name, target->type->name))) {
547 i++;
548 }
549 if (i >= FREERTOS_NUM_PARAMS) {
550 LOG_ERROR("Could not find target in FreeRTOS compatibility list");
551 return -1;
552 }
553
554 target->rtos->rtos_specific_params = (void *) &FreeRTOS_params_list[i];
555 return 0;
556 }
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