Rev 3026 | Rev 3031 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
2894 | svoboda | 1 | /* |
2 | * Copyright (c) 2008 Jiri Svoboda |
||
3 | * All rights reserved. |
||
4 | * |
||
5 | * Redistribution and use in source and binary forms, with or without |
||
6 | * modification, are permitted provided that the following conditions |
||
7 | * are met: |
||
8 | * |
||
9 | * - Redistributions of source code must retain the above copyright |
||
10 | * notice, this list of conditions and the following disclaimer. |
||
11 | * - Redistributions in binary form must reproduce the above copyright |
||
12 | * notice, this list of conditions and the following disclaimer in the |
||
13 | * documentation and/or other materials provided with the distribution. |
||
14 | * - The name of the author may not be used to endorse or promote products |
||
15 | * derived from this software without specific prior written permission. |
||
16 | * |
||
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
27 | */ |
||
28 | |||
2801 | svoboda | 29 | /** @addtogroup generic |
30 | * @{ |
||
31 | */ |
||
32 | |||
33 | /** |
||
34 | * @file |
||
2894 | svoboda | 35 | * @brief Udebug. |
2801 | svoboda | 36 | */ |
37 | |||
38 | #include <synch/waitq.h> |
||
39 | #include <console/klog.h> |
||
2813 | svoboda | 40 | #include <udebug/udebug.h> |
2870 | svoboda | 41 | #include <errno.h> |
2801 | svoboda | 42 | #include <arch.h> |
43 | |||
3026 | svoboda | 44 | /* |
45 | * FIXME: Don't grab TASK->udebug.lock in this module, synchronize |
||
46 | * only with THREAD->udebug.lock. |
||
47 | * |
||
48 | * For this reason, TASK->udebug.lock is not guarded against the interrupt |
||
49 | * handler in udebug_ops.c. (which could deadlock) |
||
50 | */ |
||
51 | |||
52 | static inline void udebug_int_lock(void) |
||
53 | { |
||
54 | atomic_inc(&THREAD->udebug.int_lock); |
||
55 | } |
||
56 | |||
57 | static inline void udebug_int_unlock(void) |
||
58 | { |
||
59 | atomic_dec(&THREAD->udebug.int_lock); |
||
60 | } |
||
61 | |||
3014 | svoboda | 62 | void udebug_task_init(udebug_task_t *ut) |
63 | { |
||
3016 | svoboda | 64 | mutex_initialize(&ut->lock); |
3014 | svoboda | 65 | ut->dt_state = UDEBUG_TS_INACTIVE; |
66 | ut->begin_call = NULL; |
||
67 | ut->not_stoppable_count = 0; |
||
68 | ut->evmask = 0; |
||
69 | } |
||
70 | |||
3018 | svoboda | 71 | void udebug_thread_initialize(udebug_thread_t *ut) |
72 | { |
||
3026 | svoboda | 73 | mutex_initialize(&ut->lock); |
3018 | svoboda | 74 | waitq_initialize(&ut->go_wq); |
3026 | svoboda | 75 | |
76 | /* |
||
77 | * At the beginning the thread is stoppable, so int_lock be set, too. |
||
78 | */ |
||
79 | atomic_set(&ut->int_lock, 1); |
||
80 | |||
3018 | svoboda | 81 | ut->go_call = NULL; |
82 | ut->uspace_state = NULL; |
||
83 | ut->stop = true; |
||
84 | ut->stoppable = true; |
||
85 | ut->debug_active = false; |
||
86 | ut->cur_event = 0; /* none */ |
||
87 | } |
||
88 | |||
2917 | svoboda | 89 | static void udebug_wait_for_go(waitq_t *wq) |
90 | { |
||
91 | int rc; |
||
92 | ipl_t ipl; |
||
93 | |||
94 | ipl = waitq_sleep_prepare(wq); |
||
95 | |||
96 | wq->missed_wakeups = 0; /* Enforce blocking. */ |
||
97 | rc = waitq_sleep_timeout_unsafe(wq, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE); |
||
98 | |||
99 | waitq_sleep_finish(wq, rc, ipl); |
||
100 | } |
||
101 | |||
3030 | svoboda | 102 | /** Do a preliminary check that a debugging session is in progress. |
103 | * |
||
104 | * This only requires the THREAD->udebug.lock mutex (and not |
||
105 | * TASK->udebug.lock mutex). For an undebugged task, this will |
||
106 | * never block (while there could be collisions by different threads |
||
107 | * on the TASK mutex), thus improving SMP perormance for undebugged tasks. |
||
108 | */ |
||
109 | static bool udebug_thread_precheck(void) |
||
110 | { |
||
111 | bool res; |
||
112 | |||
113 | mutex_lock(&THREAD->udebug.lock); |
||
114 | res = THREAD->udebug.debug_active; |
||
115 | mutex_unlock(&THREAD->udebug.lock); |
||
116 | |||
117 | return res; |
||
118 | } |
||
119 | |||
2804 | svoboda | 120 | void udebug_stoppable_begin(void) |
2801 | svoboda | 121 | { |
2804 | svoboda | 122 | int nsc; |
2898 | svoboda | 123 | call_t *db_call, *go_call; |
2804 | svoboda | 124 | |
2902 | svoboda | 125 | ASSERT(THREAD); |
126 | ASSERT(TASK); |
||
127 | |||
3026 | svoboda | 128 | udebug_int_lock(); |
129 | |||
3030 | svoboda | 130 | /* Early check for undebugged tasks */ |
131 | if (!udebug_thread_precheck()) { |
||
132 | udebug_int_unlock(); |
||
133 | return; |
||
134 | } |
||
135 | |||
3016 | svoboda | 136 | mutex_lock(&TASK->udebug.lock); |
2804 | svoboda | 137 | |
3014 | svoboda | 138 | nsc = --TASK->udebug.not_stoppable_count; |
2804 | svoboda | 139 | |
3014 | svoboda | 140 | if (TASK->udebug.dt_state == UDEBUG_TS_BEGINNING) { |
2804 | svoboda | 141 | klog_printf("udebug_stoppable_begin"); |
142 | klog_printf(" - nsc := %d", nsc); |
||
143 | } |
||
144 | |||
3014 | svoboda | 145 | if (TASK->udebug.dt_state == UDEBUG_TS_BEGINNING && nsc == 0) { |
2898 | svoboda | 146 | /* |
147 | * This was the last non-stoppable thread. Reply to |
||
148 | * DEBUG_BEGIN call. |
||
149 | */ |
||
150 | |||
3014 | svoboda | 151 | db_call = TASK->udebug.begin_call; |
2902 | svoboda | 152 | ASSERT(db_call); |
153 | |||
3018 | svoboda | 154 | /* Lock order OK, THREAD->udebug.lock is after TASK->udebug.lock */ |
3026 | svoboda | 155 | mutex_lock(&THREAD->udebug.lock); |
156 | ASSERT(THREAD->udebug.stoppable == false); |
||
3018 | svoboda | 157 | THREAD->udebug.stoppable = true; |
3026 | svoboda | 158 | mutex_unlock(&THREAD->udebug.lock); |
2898 | svoboda | 159 | |
3014 | svoboda | 160 | TASK->udebug.dt_state = UDEBUG_TS_ACTIVE; |
161 | TASK->udebug.begin_call = NULL; |
||
3016 | svoboda | 162 | mutex_unlock(&TASK->udebug.lock); |
2804 | svoboda | 163 | |
164 | IPC_SET_RETVAL(db_call->data, 0); |
||
2913 | svoboda | 165 | //klog_printf("udebug_stoppable_begin/ipc_answer"); |
2804 | svoboda | 166 | ipc_answer(&TASK->answerbox, db_call); |
2898 | svoboda | 167 | |
3014 | svoboda | 168 | } else if (TASK->udebug.dt_state == UDEBUG_TS_ACTIVE) { |
2898 | svoboda | 169 | /* |
170 | * Active debugging session |
||
171 | */ |
||
172 | |||
3018 | svoboda | 173 | /* Lock order OK, THREAD->udebug.lock is after TASK->udebug.lock */ |
3026 | svoboda | 174 | mutex_lock(&THREAD->udebug.lock); |
175 | ASSERT(THREAD->udebug.stoppable == false); |
||
3018 | svoboda | 176 | THREAD->udebug.stoppable = true; |
2898 | svoboda | 177 | |
3018 | svoboda | 178 | if (THREAD->udebug.debug_active && THREAD->udebug.stop) { |
2898 | svoboda | 179 | /* |
180 | * Thread was requested to stop - answer go call |
||
181 | */ |
||
182 | |||
183 | /* Make sure nobody takes this call away from us */ |
||
3018 | svoboda | 184 | go_call = THREAD->udebug.go_call; |
185 | THREAD->udebug.go_call = NULL; |
||
2902 | svoboda | 186 | ASSERT(go_call); |
2898 | svoboda | 187 | |
188 | IPC_SET_RETVAL(go_call->data, 0); |
||
189 | IPC_SET_ARG1(go_call->data, UDEBUG_EVENT_STOP); |
||
190 | |||
3018 | svoboda | 191 | THREAD->udebug.cur_event = UDEBUG_EVENT_STOP; |
3026 | svoboda | 192 | mutex_unlock(&THREAD->udebug.lock); |
2898 | svoboda | 193 | |
194 | ipc_answer(&TASK->answerbox, go_call); |
||
195 | |||
3016 | svoboda | 196 | mutex_unlock(&TASK->udebug.lock); |
2898 | svoboda | 197 | } else { |
198 | /* |
||
199 | * No stop request - nothing happens. |
||
200 | */ |
||
3026 | svoboda | 201 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 202 | mutex_unlock(&TASK->udebug.lock); |
2898 | svoboda | 203 | } |
2804 | svoboda | 204 | } else { |
2898 | svoboda | 205 | /* |
206 | * All other cases - nothing special happens. |
||
207 | */ |
||
208 | |||
3018 | svoboda | 209 | /* Lock order OK, THREAD->udebug.lock is after TASK->udebug.lock */ |
3026 | svoboda | 210 | mutex_lock(&THREAD->udebug.lock); |
211 | ASSERT(THREAD->udebug.stoppable == false); |
||
3018 | svoboda | 212 | THREAD->udebug.stoppable = true; |
3026 | svoboda | 213 | mutex_unlock(&THREAD->udebug.lock); |
2898 | svoboda | 214 | |
3016 | svoboda | 215 | mutex_unlock(&TASK->udebug.lock); |
2804 | svoboda | 216 | } |
217 | } |
||
218 | |||
219 | void udebug_stoppable_end(void) |
||
220 | { |
||
3030 | svoboda | 221 | /* Early check for undebugged tasks */ |
222 | if (!udebug_thread_precheck()) { |
||
223 | udebug_int_unlock(); |
||
224 | return; |
||
225 | } |
||
226 | |||
2804 | svoboda | 227 | restart: |
3016 | svoboda | 228 | mutex_lock(&TASK->udebug.lock); |
229 | |||
3018 | svoboda | 230 | /* Lock order OK, THREAD->udebug.lock is after TASK->udebug.lock */ |
3026 | svoboda | 231 | mutex_lock(&THREAD->udebug.lock); |
2898 | svoboda | 232 | |
3014 | svoboda | 233 | if (TASK->udebug.dt_state == UDEBUG_TS_ACTIVE) { |
2913 | svoboda | 234 | //klog_printf("udebug_stoppable_end"); |
3018 | svoboda | 235 | //klog_printf("udebug.stop=%d", THREAD->udebug.stop); |
2898 | svoboda | 236 | } |
237 | |||
3018 | svoboda | 238 | if (THREAD->udebug.debug_active && |
239 | THREAD->udebug.stop == true) { |
||
3014 | svoboda | 240 | TASK->udebug.begin_call = NULL; |
3026 | svoboda | 241 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 242 | mutex_unlock(&TASK->udebug.lock); |
2823 | svoboda | 243 | |
3018 | svoboda | 244 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
2917 | svoboda | 245 | |
2804 | svoboda | 246 | goto restart; |
247 | /* must try again - have to lose stoppability atomically */ |
||
248 | } else { |
||
3014 | svoboda | 249 | ++TASK->udebug.not_stoppable_count; |
3026 | svoboda | 250 | ASSERT(THREAD->udebug.stoppable == true); |
3018 | svoboda | 251 | THREAD->udebug.stoppable = false; |
2898 | svoboda | 252 | |
3026 | svoboda | 253 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 254 | mutex_unlock(&TASK->udebug.lock); |
2801 | svoboda | 255 | } |
3026 | svoboda | 256 | |
257 | udebug_int_unlock(); |
||
2801 | svoboda | 258 | } |
259 | |||
3015 | svoboda | 260 | /** Upon being scheduled to run, check if the current thread should stop. |
261 | * |
||
262 | * This function is called from clock(). Preemption is enabled. |
||
263 | * interrupts are disabled, but since this is called after |
||
264 | * being scheduled-in, we can enable them, if we're careful enough |
||
3026 | svoboda | 265 | * not to allow arbitrary recursion or deadlock with the thread context. |
3015 | svoboda | 266 | */ |
267 | void udebug_before_thread_runs(void) |
||
268 | { |
||
269 | ipl_t ipl; |
||
270 | |||
3026 | svoboda | 271 | ASSERT(!PREEMPTION_DISABLED); |
272 | |||
273 | /* |
||
274 | * Prevent agains re-entering, such as when preempted inside this |
||
275 | * function. |
||
276 | */ |
||
277 | if (atomic_get(&THREAD->udebug.int_lock) != 0) |
||
3015 | svoboda | 278 | return; |
279 | |||
3026 | svoboda | 280 | udebug_int_lock(); |
281 | |||
3015 | svoboda | 282 | ipl = interrupts_enable(); |
283 | |||
3016 | svoboda | 284 | /* Now we're free to do whatever we need (lock mutexes, sleep, etc.) */ |
3015 | svoboda | 285 | |
286 | /* Check if we're supposed to stop */ |
||
287 | udebug_stoppable_begin(); |
||
288 | udebug_stoppable_end(); |
||
289 | |||
290 | interrupts_restore(ipl); |
||
3026 | svoboda | 291 | |
292 | udebug_int_unlock(); |
||
3015 | svoboda | 293 | } |
294 | |||
2805 | svoboda | 295 | void udebug_syscall_event(unative_t a1, unative_t a2, unative_t a3, |
2901 | svoboda | 296 | unative_t a4, unative_t a5, unative_t a6, unative_t id, unative_t rc, |
297 | bool end_variant) |
||
2801 | svoboda | 298 | { |
2805 | svoboda | 299 | call_t *call; |
2901 | svoboda | 300 | udebug_event_t etype; |
2805 | svoboda | 301 | |
2901 | svoboda | 302 | etype = end_variant ? UDEBUG_EVENT_SYSCALL_E : UDEBUG_EVENT_SYSCALL_B; |
303 | |||
3026 | svoboda | 304 | udebug_int_lock(); |
305 | |||
3030 | svoboda | 306 | /* Early check for undebugged tasks */ |
307 | if (!udebug_thread_precheck()) { |
||
308 | udebug_int_unlock(); |
||
309 | return; |
||
310 | } |
||
311 | |||
3016 | svoboda | 312 | mutex_lock(&TASK->udebug.lock); |
3026 | svoboda | 313 | mutex_lock(&THREAD->udebug.lock); |
3016 | svoboda | 314 | |
2854 | svoboda | 315 | /* Must only generate events when in debugging session and have go */ |
3018 | svoboda | 316 | if (THREAD->udebug.debug_active != true || |
317 | THREAD->udebug.stop == true || |
||
3014 | svoboda | 318 | (TASK->udebug.evmask & UDEBUG_EVMASK(etype)) == 0) { |
3026 | svoboda | 319 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 320 | mutex_unlock(&TASK->udebug.lock); |
2867 | svoboda | 321 | return; |
322 | } |
||
2804 | svoboda | 323 | |
2913 | svoboda | 324 | //klog_printf("udebug_syscall_event"); |
3018 | svoboda | 325 | call = THREAD->udebug.go_call; |
326 | THREAD->udebug.go_call = NULL; |
||
3016 | svoboda | 327 | |
2867 | svoboda | 328 | IPC_SET_RETVAL(call->data, 0); |
2901 | svoboda | 329 | IPC_SET_ARG1(call->data, etype); |
2867 | svoboda | 330 | IPC_SET_ARG2(call->data, id); |
331 | IPC_SET_ARG3(call->data, rc); |
||
2913 | svoboda | 332 | //klog_printf("udebug_syscall_event/ipc_answer"); |
2805 | svoboda | 333 | |
3018 | svoboda | 334 | THREAD->udebug.syscall_args[0] = a1; |
335 | THREAD->udebug.syscall_args[1] = a2; |
||
336 | THREAD->udebug.syscall_args[2] = a3; |
||
337 | THREAD->udebug.syscall_args[3] = a4; |
||
338 | THREAD->udebug.syscall_args[4] = a5; |
||
339 | THREAD->udebug.syscall_args[5] = a6; |
||
2866 | svoboda | 340 | |
2867 | svoboda | 341 | /* |
3018 | svoboda | 342 | * Make sure udebug.stop is true when going to sleep |
2867 | svoboda | 343 | * in case we get woken up by DEBUG_END. (At which |
344 | * point it must be back to the initial true value). |
||
345 | */ |
||
3018 | svoboda | 346 | THREAD->udebug.stop = true; |
2825 | svoboda | 347 | |
3018 | svoboda | 348 | THREAD->udebug.cur_event = etype; |
3026 | svoboda | 349 | mutex_unlock(&THREAD->udebug.lock); |
2867 | svoboda | 350 | |
3016 | svoboda | 351 | ipc_answer(&TASK->answerbox, call); |
352 | |||
353 | mutex_unlock(&TASK->udebug.lock); |
||
354 | |||
3018 | svoboda | 355 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
3026 | svoboda | 356 | |
357 | udebug_int_unlock(); |
||
2867 | svoboda | 358 | } |
359 | |||
2903 | svoboda | 360 | void udebug_thread_b_event(struct thread *t) |
2867 | svoboda | 361 | { |
362 | call_t *call; |
||
363 | |||
3026 | svoboda | 364 | udebug_int_lock(); |
365 | |||
3016 | svoboda | 366 | mutex_lock(&TASK->udebug.lock); |
3026 | svoboda | 367 | mutex_lock(&THREAD->udebug.lock); |
3016 | svoboda | 368 | |
2903 | svoboda | 369 | klog_printf("udebug_thread_b_event"); |
2867 | svoboda | 370 | klog_printf("- check state"); |
371 | |||
372 | /* Must only generate events when in debugging session */ |
||
3018 | svoboda | 373 | if (THREAD->udebug.debug_active != true) { |
374 | klog_printf("- debug_active: %s, udebug.stop: %s", |
||
375 | THREAD->udebug.debug_active ? "yes(+)" : "no(-)", |
||
376 | THREAD->udebug.stop ? "yes(-)" : "no(+)"); |
||
3026 | svoboda | 377 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 378 | mutex_unlock(&TASK->udebug.lock); |
2867 | svoboda | 379 | return; |
2801 | svoboda | 380 | } |
2867 | svoboda | 381 | |
382 | klog_printf("- trigger event"); |
||
383 | |||
3018 | svoboda | 384 | call = THREAD->udebug.go_call; |
385 | THREAD->udebug.go_call = NULL; |
||
2867 | svoboda | 386 | IPC_SET_RETVAL(call->data, 0); |
2903 | svoboda | 387 | IPC_SET_ARG1(call->data, UDEBUG_EVENT_THREAD_B); |
2867 | svoboda | 388 | IPC_SET_ARG2(call->data, (unative_t)t); |
389 | |||
390 | /* |
||
3018 | svoboda | 391 | * Make sure udebug.stop is true when going to sleep |
2867 | svoboda | 392 | * in case we get woken up by DEBUG_END. (At which |
393 | * point it must be back to the initial true value). |
||
394 | */ |
||
3018 | svoboda | 395 | THREAD->udebug.stop = true; |
2867 | svoboda | 396 | |
3018 | svoboda | 397 | THREAD->udebug.cur_event = UDEBUG_EVENT_THREAD_B; |
3026 | svoboda | 398 | mutex_unlock(&THREAD->udebug.lock); |
2867 | svoboda | 399 | |
3016 | svoboda | 400 | ipc_answer(&TASK->answerbox, call); |
2867 | svoboda | 401 | |
3016 | svoboda | 402 | mutex_unlock(&TASK->udebug.lock); |
403 | |||
2867 | svoboda | 404 | klog_printf("- sleep"); |
3018 | svoboda | 405 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
3026 | svoboda | 406 | |
407 | udebug_int_unlock(); |
||
2801 | svoboda | 408 | } |
409 | |||
2903 | svoboda | 410 | void udebug_thread_e_event(void) |
411 | { |
||
412 | call_t *call; |
||
413 | |||
3026 | svoboda | 414 | udebug_int_lock(); |
415 | |||
3016 | svoboda | 416 | mutex_lock(&TASK->udebug.lock); |
3026 | svoboda | 417 | mutex_lock(&THREAD->udebug.lock); |
3016 | svoboda | 418 | |
2903 | svoboda | 419 | klog_printf("udebug_thread_e_event"); |
420 | klog_printf("- check state"); |
||
421 | |||
422 | /* Must only generate events when in debugging session */ |
||
3018 | svoboda | 423 | if (THREAD->udebug.debug_active != true) { |
424 | klog_printf("- debug_active: %s, udebug.stop: %s", |
||
425 | THREAD->udebug.debug_active ? "yes(+)" : "no(-)", |
||
426 | THREAD->udebug.stop ? "yes(-)" : "no(+)"); |
||
3026 | svoboda | 427 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 428 | mutex_unlock(&TASK->udebug.lock); |
2903 | svoboda | 429 | return; |
430 | } |
||
431 | |||
432 | klog_printf("- trigger event"); |
||
433 | |||
3018 | svoboda | 434 | call = THREAD->udebug.go_call; |
435 | THREAD->udebug.go_call = NULL; |
||
2903 | svoboda | 436 | IPC_SET_RETVAL(call->data, 0); |
437 | IPC_SET_ARG1(call->data, UDEBUG_EVENT_THREAD_E); |
||
438 | |||
2908 | svoboda | 439 | /* Prevent any further debug activity in thread */ |
3018 | svoboda | 440 | THREAD->udebug.debug_active = false; |
441 | THREAD->udebug.cur_event = 0; /* none */ |
||
442 | THREAD->udebug.stop = true; /* set to initial value */ |
||
3016 | svoboda | 443 | |
3026 | svoboda | 444 | mutex_unlock(&THREAD->udebug.lock); |
2903 | svoboda | 445 | |
3016 | svoboda | 446 | ipc_answer(&TASK->answerbox, call); |
2903 | svoboda | 447 | |
3016 | svoboda | 448 | mutex_unlock(&TASK->udebug.lock); |
2903 | svoboda | 449 | |
3026 | svoboda | 450 | /* Leave int_lock enabled */ |
2908 | svoboda | 451 | /* This event does not sleep - debugging has finished in this thread */ |
2903 | svoboda | 452 | } |
453 | |||
2921 | svoboda | 454 | static void breakpoint_trap_event(uintptr_t addr, udebug_event_t etype) |
2918 | svoboda | 455 | { |
456 | call_t *call; |
||
2903 | svoboda | 457 | |
3026 | svoboda | 458 | udebug_int_lock(); |
459 | |||
3016 | svoboda | 460 | mutex_lock(&TASK->udebug.lock); |
3026 | svoboda | 461 | mutex_lock(&THREAD->udebug.lock); |
3016 | svoboda | 462 | |
2918 | svoboda | 463 | /* Must only generate events when in debugging session and have go */ |
3018 | svoboda | 464 | if (THREAD->udebug.debug_active != true || |
3030 | svoboda | 465 | THREAD->udebug.stop == true) { |
3026 | svoboda | 466 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 467 | mutex_unlock(&TASK->udebug.lock); |
3030 | svoboda | 468 | udebug_int_unlock(); |
2918 | svoboda | 469 | return; |
470 | } |
||
471 | |||
3030 | svoboda | 472 | /* Verify that the event is enabled */ |
473 | if ((TASK->udebug.evmask & UDEBUG_EVMASK(etype)) == 0) { |
||
474 | mutex_unlock(&THREAD->udebug.lock); |
||
475 | mutex_unlock(&TASK->udebug.lock); |
||
476 | udebug_int_unlock(); |
||
477 | return; |
||
478 | } |
||
479 | |||
2921 | svoboda | 480 | klog_printf("udebug_breakpoint/trap_event"); |
3018 | svoboda | 481 | call = THREAD->udebug.go_call; |
482 | THREAD->udebug.go_call = NULL; |
||
3016 | svoboda | 483 | |
2918 | svoboda | 484 | IPC_SET_RETVAL(call->data, 0); |
485 | IPC_SET_ARG1(call->data, etype); |
||
486 | IPC_SET_ARG2(call->data, addr); |
||
487 | |||
488 | /* |
||
3018 | svoboda | 489 | * Make sure udebug.stop is true when going to sleep |
2918 | svoboda | 490 | * in case we get woken up by DEBUG_END. (At which |
491 | * point it must be back to the initial true value). |
||
492 | */ |
||
3018 | svoboda | 493 | THREAD->udebug.stop = true; |
2918 | svoboda | 494 | |
3018 | svoboda | 495 | THREAD->udebug.cur_event = etype; |
3026 | svoboda | 496 | mutex_unlock(&THREAD->udebug.lock); |
497 | |||
2918 | svoboda | 498 | klog_printf("- send answer"); |
499 | |||
3016 | svoboda | 500 | ipc_answer(&TASK->answerbox, call); |
501 | mutex_unlock(&TASK->udebug.lock); |
||
2918 | svoboda | 502 | |
3018 | svoboda | 503 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
3026 | svoboda | 504 | |
505 | udebug_int_unlock(); |
||
2918 | svoboda | 506 | } |
507 | |||
2921 | svoboda | 508 | void udebug_breakpoint_event(uintptr_t addr) |
509 | { |
||
510 | breakpoint_trap_event(addr, UDEBUG_EVENT_BREAKPOINT); |
||
511 | } |
||
2918 | svoboda | 512 | |
2921 | svoboda | 513 | void udebug_trap_event(uintptr_t addr) |
514 | { |
||
515 | breakpoint_trap_event(addr, UDEBUG_EVENT_TRAP); |
||
516 | } |
||
517 | |||
2870 | svoboda | 518 | /** |
519 | * Terminate task debugging session. |
||
520 | * |
||
3016 | svoboda | 521 | * \param ta->udebug.lock must be already locked. |
2870 | svoboda | 522 | * \return Zero on success or negative error code. |
523 | */ |
||
524 | int udebug_task_cleanup(struct task *ta) |
||
525 | { |
||
526 | thread_t *t; |
||
527 | link_t *cur; |
||
528 | int flags; |
||
3016 | svoboda | 529 | ipl_t ipl; |
2867 | svoboda | 530 | |
2870 | svoboda | 531 | klog_printf("udebug_task_cleanup()"); |
532 | klog_printf("task %llu", ta->taskid); |
||
533 | |||
3026 | svoboda | 534 | udebug_int_lock(); |
535 | |||
3014 | svoboda | 536 | if (ta->udebug.dt_state == UDEBUG_TS_BEGINNING && |
537 | ta->udebug.dt_state != UDEBUG_TS_ACTIVE) { |
||
2870 | svoboda | 538 | klog_printf("udebug_task_cleanup(): task not being debugged"); |
539 | return EINVAL; |
||
540 | } |
||
541 | |||
542 | /* Finish debugging of all userspace threads */ |
||
543 | for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) { |
||
544 | t = list_get_instance(cur, thread_t, th_link); |
||
545 | |||
3026 | svoboda | 546 | mutex_lock(&t->udebug.lock); |
547 | |||
3016 | svoboda | 548 | ipl = interrupts_disable(); |
2870 | svoboda | 549 | spinlock_lock(&t->lock); |
550 | |||
551 | flags = t->flags; |
||
552 | |||
553 | spinlock_unlock(&t->lock); |
||
3026 | svoboda | 554 | interrupts_restore(ipl); |
2870 | svoboda | 555 | |
556 | /* Only process userspace threads */ |
||
557 | if ((flags & THREAD_FLAG_USPACE) != 0) { |
||
558 | /* Prevent any further debug activity in thread */ |
||
3018 | svoboda | 559 | t->udebug.debug_active = false; |
560 | t->udebug.cur_event = 0; /* none */ |
||
2870 | svoboda | 561 | |
562 | /* Still has go? */ |
||
3018 | svoboda | 563 | if (t->udebug.stop == false) { |
2870 | svoboda | 564 | /* |
565 | * Yes, so clear go. As debug_active == false, |
||
566 | * this doesn't affect anything. |
||
567 | */ |
||
3018 | svoboda | 568 | t->udebug.stop = true; |
2870 | svoboda | 569 | |
570 | /* Answer GO call */ |
||
571 | klog_printf("answer GO call with EVENT_FINISHED"); |
||
3018 | svoboda | 572 | IPC_SET_RETVAL(t->udebug.go_call->data, 0); |
573 | IPC_SET_ARG1(t->udebug.go_call->data, UDEBUG_EVENT_FINISHED); |
||
3026 | svoboda | 574 | |
3018 | svoboda | 575 | ipc_answer(&ta->answerbox, t->udebug.go_call); |
576 | t->udebug.go_call = NULL; |
||
2870 | svoboda | 577 | } else { |
578 | /* |
||
579 | * Debug_stop is already at initial value. |
||
580 | * Yet this means the thread needs waking up. |
||
581 | */ |
||
582 | |||
583 | /* |
||
584 | * t's lock must not be held when calling |
||
585 | * waitq_wakeup. |
||
586 | */ |
||
3018 | svoboda | 587 | waitq_wakeup(&t->udebug.go_wq, WAKEUP_FIRST); |
2870 | svoboda | 588 | } |
589 | } |
||
3026 | svoboda | 590 | mutex_unlock(&t->udebug.lock); |
2870 | svoboda | 591 | } |
592 | |||
3014 | svoboda | 593 | ta->udebug.dt_state = UDEBUG_TS_INACTIVE; |
594 | ta->udebug.debugger = NULL; |
||
2870 | svoboda | 595 | |
3026 | svoboda | 596 | udebug_int_unlock(); |
597 | |||
2870 | svoboda | 598 | return 0; |
599 | } |
||
600 | |||
601 | |||
2801 | svoboda | 602 | /** @} |
603 | */ |