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1 | /* |
1 | /* |
2 | * Copyright (c) 2008 Jiri Svoboda |
2 | * Copyright (c) 2008 Jiri Svoboda |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup generic |
29 | /** @addtogroup generic |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | /** |
33 | /** |
34 | * @file |
34 | * @file |
35 | * @brief Udebug hooks and data structure management. |
35 | * @brief Udebug hooks and data structure management. |
36 | * |
36 | * |
37 | * Udebug is an interface that makes userspace debuggers possible. |
37 | * Udebug is an interface that makes userspace debuggers possible. |
38 | * |
- | |
39 | * Functions in this file are executed directly in each thread, which |
- | |
40 | * may or may not be the subject of debugging. The udebug_stoppable_begin/end() |
- | |
41 | * functions are also executed in the clock interrupt handler. To avoid |
- | |
42 | * deadlock, functions in this file are protected from the interrupt |
- | |
43 | * by locking the recursive lock THREAD->udebug.int_lock (just an atomic |
- | |
44 | * variable). This prevents udebug_stoppable_begin/end() from being |
- | |
45 | * executed in the interrupt handler (they are skipped). |
- | |
46 | * |
- | |
47 | * Functions in udebug_ops.c and udebug_ipc.c execute in different threads, |
- | |
48 | * so they needn't be protected from the (preemptible) interrupt-initiated |
- | |
49 | * code. |
- | |
50 | */ |
38 | */ |
51 | 39 | ||
52 | #include <synch/waitq.h> |
40 | #include <synch/waitq.h> |
53 | #include <debug.h> |
41 | #include <debug.h> |
54 | #include <udebug/udebug.h> |
42 | #include <udebug/udebug.h> |
55 | #include <errno.h> |
43 | #include <errno.h> |
56 | #include <arch.h> |
44 | #include <arch.h> |
57 | 45 | ||
58 | static inline void udebug_int_lock(void) |
- | |
59 | { |
- | |
60 | atomic_inc(&THREAD->udebug.int_lock); |
- | |
61 | } |
- | |
62 | - | ||
63 | static inline void udebug_int_unlock(void) |
- | |
64 | { |
- | |
65 | atomic_dec(&THREAD->udebug.int_lock); |
- | |
66 | } |
- | |
67 | 46 | ||
68 | /** Initialize udebug part of task structure. |
47 | /** Initialize udebug part of task structure. |
69 | * |
48 | * |
70 | * Called as part of task structure initialization. |
49 | * Called as part of task structure initialization. |
71 | * @param ut Pointer to the structure to initialize. |
50 | * @param ut Pointer to the structure to initialize. |
72 | */ |
51 | */ |
73 | void udebug_task_init(udebug_task_t *ut) |
52 | void udebug_task_init(udebug_task_t *ut) |
74 | { |
53 | { |
75 | mutex_initialize(&ut->lock, MUTEX_PASSIVE); |
54 | mutex_initialize(&ut->lock, MUTEX_PASSIVE); |
76 | ut->dt_state = UDEBUG_TS_INACTIVE; |
55 | ut->dt_state = UDEBUG_TS_INACTIVE; |
77 | ut->begin_call = NULL; |
56 | ut->begin_call = NULL; |
78 | ut->not_stoppable_count = 0; |
57 | ut->not_stoppable_count = 0; |
79 | ut->evmask = 0; |
58 | ut->evmask = 0; |
80 | } |
59 | } |
81 | 60 | ||
82 | /** Initialize udebug part of thread structure. |
61 | /** Initialize udebug part of thread structure. |
83 | * |
62 | * |
84 | * Called as part of thread structure initialization. |
63 | * Called as part of thread structure initialization. |
85 | * @param ut Pointer to the structure to initialize. |
64 | * @param ut Pointer to the structure to initialize. |
86 | */ |
65 | */ |
87 | void udebug_thread_initialize(udebug_thread_t *ut) |
66 | void udebug_thread_initialize(udebug_thread_t *ut) |
88 | { |
67 | { |
89 | mutex_initialize(&ut->lock, MUTEX_PASSIVE); |
68 | mutex_initialize(&ut->lock, MUTEX_PASSIVE); |
90 | waitq_initialize(&ut->go_wq); |
69 | waitq_initialize(&ut->go_wq); |
91 | 70 | ||
92 | /* |
- | |
93 | * At the beginning the thread is stoppable, so int_lock be set, too. |
- | |
94 | */ |
- | |
95 | atomic_set(&ut->int_lock, 1); |
- | |
96 | - | ||
97 | ut->go_call = NULL; |
71 | ut->go_call = NULL; |
- | 72 | ut->uspace_state = NULL; |
|
98 | ut->go = false; |
73 | ut->go = false; |
99 | ut->stoppable = true; |
74 | ut->stoppable = true; |
100 | ut->debug_active = false; |
75 | ut->debug_active = false; |
101 | ut->cur_event = 0; /* none */ |
76 | ut->cur_event = 0; /* none */ |
102 | } |
77 | } |
103 | 78 | ||
104 | /** Wait for a GO message. |
79 | /** Wait for a GO message. |
105 | * |
80 | * |
106 | * When a debugging event occurs in a thread or the thread is stopped, |
81 | * When a debugging event occurs in a thread or the thread is stopped, |
107 | * this function is called to block the thread until a GO message |
82 | * this function is called to block the thread until a GO message |
108 | * is received. |
83 | * is received. |
109 | * |
84 | * |
110 | * @param wq The wait queue used by the thread to wait for GO messages. |
85 | * @param wq The wait queue used by the thread to wait for GO messages. |
111 | */ |
86 | */ |
112 | static void udebug_wait_for_go(waitq_t *wq) |
87 | static void udebug_wait_for_go(waitq_t *wq) |
113 | { |
88 | { |
114 | int rc; |
89 | int rc; |
115 | ipl_t ipl; |
90 | ipl_t ipl; |
116 | 91 | ||
117 | ipl = waitq_sleep_prepare(wq); |
92 | ipl = waitq_sleep_prepare(wq); |
118 | 93 | ||
119 | wq->missed_wakeups = 0; /* Enforce blocking. */ |
94 | wq->missed_wakeups = 0; /* Enforce blocking. */ |
120 | rc = waitq_sleep_timeout_unsafe(wq, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE); |
95 | rc = waitq_sleep_timeout_unsafe(wq, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE); |
121 | 96 | ||
122 | waitq_sleep_finish(wq, rc, ipl); |
97 | waitq_sleep_finish(wq, rc, ipl); |
123 | } |
98 | } |
124 | 99 | ||
125 | /** Do a preliminary check that a debugging session is in progress. |
100 | /** Do a preliminary check that a debugging session is in progress. |
126 | * |
101 | * |
127 | * This only requires the THREAD->udebug.lock mutex (and not TASK->udebug.lock |
102 | * This only requires the THREAD->udebug.lock mutex (and not TASK->udebug.lock |
128 | * mutex). For an undebugged task, this will never block (while there could be |
103 | * mutex). For an undebugged task, this will never block (while there could be |
129 | * collisions by different threads on the TASK mutex), thus improving SMP |
104 | * collisions by different threads on the TASK mutex), thus improving SMP |
130 | * perormance for undebugged tasks. |
105 | * perormance for undebugged tasks. |
131 | * |
106 | * |
132 | * @return True if the thread was in a debugging session when the function |
107 | * @return True if the thread was in a debugging session when the function |
133 | * checked, false otherwise. |
108 | * checked, false otherwise. |
134 | */ |
109 | */ |
135 | static bool udebug_thread_precheck(void) |
110 | static bool udebug_thread_precheck(void) |
136 | { |
111 | { |
137 | bool res; |
112 | bool res; |
138 | 113 | ||
139 | mutex_lock(&THREAD->udebug.lock); |
114 | mutex_lock(&THREAD->udebug.lock); |
140 | res = THREAD->udebug.debug_active; |
115 | res = THREAD->udebug.debug_active; |
141 | mutex_unlock(&THREAD->udebug.lock); |
116 | mutex_unlock(&THREAD->udebug.lock); |
142 | 117 | ||
143 | return res; |
118 | return res; |
144 | } |
119 | } |
145 | 120 | ||
146 | /** Start of stoppable section. |
121 | /** Start of stoppable section. |
147 | * |
122 | * |
148 | * A stoppable section is a section of code where if the thread can be stoped. In other words, |
123 | * A stoppable section is a section of code where if the thread can be stoped. In other words, |
149 | * if a STOP operation is issued, the thread is guaranteed not to execute |
124 | * if a STOP operation is issued, the thread is guaranteed not to execute |
150 | * any userspace instructions until the thread is resumed. |
125 | * any userspace instructions until the thread is resumed. |
151 | * |
126 | * |
152 | * Having stoppable sections is better than having stopping points, since |
127 | * Having stoppable sections is better than having stopping points, since |
153 | * a thread can be stopped even when it is blocked indefinitely in a system |
128 | * a thread can be stopped even when it is blocked indefinitely in a system |
154 | * call (whereas it would not reach any stopping point). |
129 | * call (whereas it would not reach any stopping point). |
155 | */ |
130 | */ |
156 | void udebug_stoppable_begin(void) |
131 | void udebug_stoppable_begin(void) |
157 | { |
132 | { |
158 | int nsc; |
133 | int nsc; |
159 | call_t *db_call, *go_call; |
134 | call_t *db_call, *go_call; |
160 | 135 | ||
161 | ASSERT(THREAD); |
136 | ASSERT(THREAD); |
162 | ASSERT(TASK); |
137 | ASSERT(TASK); |
163 | 138 | ||
164 | udebug_int_lock(); |
- | |
165 | - | ||
166 | /* Early check for undebugged tasks */ |
139 | /* Early check for undebugged tasks */ |
167 | if (!udebug_thread_precheck()) { |
140 | if (!udebug_thread_precheck()) { |
168 | udebug_int_unlock(); |
- | |
169 | return; |
141 | return; |
170 | } |
142 | } |
171 | 143 | ||
172 | mutex_lock(&TASK->udebug.lock); |
144 | mutex_lock(&TASK->udebug.lock); |
173 | 145 | ||
174 | nsc = --TASK->udebug.not_stoppable_count; |
146 | nsc = --TASK->udebug.not_stoppable_count; |
175 | 147 | ||
176 | /* Lock order OK, THREAD->udebug.lock is after TASK->udebug.lock */ |
148 | /* Lock order OK, THREAD->udebug.lock is after TASK->udebug.lock */ |
177 | mutex_lock(&THREAD->udebug.lock); |
149 | mutex_lock(&THREAD->udebug.lock); |
178 | ASSERT(THREAD->udebug.stoppable == false); |
150 | ASSERT(THREAD->udebug.stoppable == false); |
179 | THREAD->udebug.stoppable = true; |
151 | THREAD->udebug.stoppable = true; |
180 | 152 | ||
181 | if (TASK->udebug.dt_state == UDEBUG_TS_BEGINNING && nsc == 0) { |
153 | if (TASK->udebug.dt_state == UDEBUG_TS_BEGINNING && nsc == 0) { |
182 | /* |
154 | /* |
183 | * This was the last non-stoppable thread. Reply to |
155 | * This was the last non-stoppable thread. Reply to |
184 | * DEBUG_BEGIN call. |
156 | * DEBUG_BEGIN call. |
185 | */ |
157 | */ |
186 | 158 | ||
187 | db_call = TASK->udebug.begin_call; |
159 | db_call = TASK->udebug.begin_call; |
188 | ASSERT(db_call); |
160 | ASSERT(db_call); |
189 | 161 | ||
190 | TASK->udebug.dt_state = UDEBUG_TS_ACTIVE; |
162 | TASK->udebug.dt_state = UDEBUG_TS_ACTIVE; |
191 | TASK->udebug.begin_call = NULL; |
163 | TASK->udebug.begin_call = NULL; |
192 | 164 | ||
193 | IPC_SET_RETVAL(db_call->data, 0); |
165 | IPC_SET_RETVAL(db_call->data, 0); |
194 | ipc_answer(&TASK->answerbox, db_call); |
166 | ipc_answer(&TASK->answerbox, db_call); |
195 | 167 | ||
196 | } else if (TASK->udebug.dt_state == UDEBUG_TS_ACTIVE) { |
168 | } else if (TASK->udebug.dt_state == UDEBUG_TS_ACTIVE) { |
197 | /* |
169 | /* |
198 | * Active debugging session |
170 | * Active debugging session |
199 | */ |
171 | */ |
200 | 172 | ||
201 | if (THREAD->udebug.debug_active == true && |
173 | if (THREAD->udebug.debug_active == true && |
202 | THREAD->udebug.go == false) { |
174 | THREAD->udebug.go == false) { |
203 | /* |
175 | /* |
204 | * Thread was requested to stop - answer go call |
176 | * Thread was requested to stop - answer go call |
205 | */ |
177 | */ |
206 | 178 | ||
207 | /* Make sure nobody takes this call away from us */ |
179 | /* Make sure nobody takes this call away from us */ |
208 | go_call = THREAD->udebug.go_call; |
180 | go_call = THREAD->udebug.go_call; |
209 | THREAD->udebug.go_call = NULL; |
181 | THREAD->udebug.go_call = NULL; |
210 | ASSERT(go_call); |
182 | ASSERT(go_call); |
211 | 183 | ||
212 | IPC_SET_RETVAL(go_call->data, 0); |
184 | IPC_SET_RETVAL(go_call->data, 0); |
213 | IPC_SET_ARG1(go_call->data, UDEBUG_EVENT_STOP); |
185 | IPC_SET_ARG1(go_call->data, UDEBUG_EVENT_STOP); |
214 | 186 | ||
215 | THREAD->udebug.cur_event = UDEBUG_EVENT_STOP; |
187 | THREAD->udebug.cur_event = UDEBUG_EVENT_STOP; |
216 | 188 | ||
217 | ipc_answer(&TASK->answerbox, go_call); |
189 | ipc_answer(&TASK->answerbox, go_call); |
218 | } |
190 | } |
219 | } |
191 | } |
220 | 192 | ||
221 | mutex_unlock(&THREAD->udebug.lock); |
193 | mutex_unlock(&THREAD->udebug.lock); |
222 | mutex_unlock(&TASK->udebug.lock); |
194 | mutex_unlock(&TASK->udebug.lock); |
223 | } |
195 | } |
224 | 196 | ||
225 | /** End of a stoppable section. |
197 | /** End of a stoppable section. |
226 | * |
198 | * |
227 | * This is the point where the thread will block if it is stopped. |
199 | * This is the point where the thread will block if it is stopped. |
228 | * (As, by definition, a stopped thread must not leave its stoppable section). |
200 | * (As, by definition, a stopped thread must not leave its stoppable section). |
229 | */ |
201 | */ |
230 | void udebug_stoppable_end(void) |
202 | void udebug_stoppable_end(void) |
231 | { |
203 | { |
232 | /* Early check for undebugged tasks */ |
204 | /* Early check for undebugged tasks */ |
233 | if (!udebug_thread_precheck()) { |
205 | if (!udebug_thread_precheck()) { |
234 | udebug_int_unlock(); |
- | |
235 | return; |
206 | return; |
236 | } |
207 | } |
237 | 208 | ||
238 | restart: |
209 | restart: |
239 | mutex_lock(&TASK->udebug.lock); |
210 | mutex_lock(&TASK->udebug.lock); |
240 | mutex_lock(&THREAD->udebug.lock); |
211 | mutex_lock(&THREAD->udebug.lock); |
241 | 212 | ||
242 | if (THREAD->udebug.debug_active && |
213 | if (THREAD->udebug.debug_active && |
243 | THREAD->udebug.go == false) { |
214 | THREAD->udebug.go == false) { |
244 | TASK->udebug.begin_call = NULL; |
215 | TASK->udebug.begin_call = NULL; |
245 | mutex_unlock(&THREAD->udebug.lock); |
216 | mutex_unlock(&THREAD->udebug.lock); |
246 | mutex_unlock(&TASK->udebug.lock); |
217 | mutex_unlock(&TASK->udebug.lock); |
247 | 218 | ||
248 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
219 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
249 | 220 | ||
250 | goto restart; |
221 | goto restart; |
251 | /* Must try again - have to lose stoppability atomically. */ |
222 | /* Must try again - have to lose stoppability atomically. */ |
252 | } else { |
223 | } else { |
253 | ++TASK->udebug.not_stoppable_count; |
224 | ++TASK->udebug.not_stoppable_count; |
254 | ASSERT(THREAD->udebug.stoppable == true); |
225 | ASSERT(THREAD->udebug.stoppable == true); |
255 | THREAD->udebug.stoppable = false; |
226 | THREAD->udebug.stoppable = false; |
256 | 227 | ||
257 | mutex_unlock(&THREAD->udebug.lock); |
228 | mutex_unlock(&THREAD->udebug.lock); |
258 | mutex_unlock(&TASK->udebug.lock); |
229 | mutex_unlock(&TASK->udebug.lock); |
259 | } |
230 | } |
260 | - | ||
261 | udebug_int_unlock(); |
- | |
262 | } |
231 | } |
263 | 232 | ||
264 | /** Upon being scheduled to run, check if the current thread should stop. |
233 | /** Upon being scheduled to run, check if the current thread should stop. |
265 | * |
234 | * |
266 | * This function is called from clock(). Preemption is enabled. |
235 | * This function is called from clock(). |
267 | * interrupts are disabled, but since this is called after |
- | |
268 | * being scheduled-in, we can enable them, if we're careful enough |
- | |
269 | * not to allow arbitrary recursion or deadlock with the thread context. |
- | |
270 | */ |
236 | */ |
271 | void udebug_before_thread_runs(void) |
237 | void udebug_before_thread_runs(void) |
272 | { |
238 | { |
273 | ipl_t ipl; |
- | |
274 | - | ||
275 | return; |
- | |
276 | ASSERT(!PREEMPTION_DISABLED); |
- | |
277 | - | ||
278 | /* |
- | |
279 | * Prevent agains re-entering, such as when preempted inside this |
- | |
280 | * function. |
- | |
281 | */ |
- | |
282 | if (atomic_get(&THREAD->udebug.int_lock) != 0) |
- | |
283 | return; |
- | |
284 | - | ||
285 | udebug_int_lock(); |
- | |
286 | - | ||
287 | ipl = interrupts_enable(); |
- | |
288 | - | ||
289 | /* Now we're free to do whatever we need (lock mutexes, sleep, etc.) */ |
- | |
290 | - | ||
291 | /* Check if we're supposed to stop */ |
239 | /* Check if we're supposed to stop */ |
292 | udebug_stoppable_begin(); |
240 | udebug_stoppable_begin(); |
293 | udebug_stoppable_end(); |
241 | udebug_stoppable_end(); |
294 | - | ||
295 | interrupts_restore(ipl); |
- | |
296 | - | ||
297 | udebug_int_unlock(); |
- | |
298 | } |
242 | } |
299 | 243 | ||
300 | /** Syscall event hook. |
244 | /** Syscall event hook. |
301 | * |
245 | * |
302 | * Must be called before and after servicing a system call. This generates |
246 | * Must be called before and after servicing a system call. This generates |
303 | * a SYSCALL_B or SYSCALL_E event, depending on the value of @a end_variant. |
247 | * a SYSCALL_B or SYSCALL_E event, depending on the value of @a end_variant. |
304 | */ |
248 | */ |
305 | void udebug_syscall_event(unative_t a1, unative_t a2, unative_t a3, |
249 | void udebug_syscall_event(unative_t a1, unative_t a2, unative_t a3, |
306 | unative_t a4, unative_t a5, unative_t a6, unative_t id, unative_t rc, |
250 | unative_t a4, unative_t a5, unative_t a6, unative_t id, unative_t rc, |
307 | bool end_variant) |
251 | bool end_variant) |
308 | { |
252 | { |
309 | call_t *call; |
253 | call_t *call; |
310 | udebug_event_t etype; |
254 | udebug_event_t etype; |
311 | 255 | ||
312 | etype = end_variant ? UDEBUG_EVENT_SYSCALL_E : UDEBUG_EVENT_SYSCALL_B; |
256 | etype = end_variant ? UDEBUG_EVENT_SYSCALL_E : UDEBUG_EVENT_SYSCALL_B; |
313 | 257 | ||
314 | udebug_int_lock(); |
- | |
315 | - | ||
316 | /* Early check for undebugged tasks */ |
258 | /* Early check for undebugged tasks */ |
317 | if (!udebug_thread_precheck()) { |
259 | if (!udebug_thread_precheck()) { |
318 | udebug_int_unlock(); |
- | |
319 | return; |
260 | return; |
320 | } |
261 | } |
321 | 262 | ||
322 | mutex_lock(&TASK->udebug.lock); |
263 | mutex_lock(&TASK->udebug.lock); |
323 | mutex_lock(&THREAD->udebug.lock); |
264 | mutex_lock(&THREAD->udebug.lock); |
324 | 265 | ||
325 | /* Must only generate events when in debugging session and is go. */ |
266 | /* Must only generate events when in debugging session and is go. */ |
326 | if (THREAD->udebug.debug_active != true || |
267 | if (THREAD->udebug.debug_active != true || |
327 | THREAD->udebug.go == false || |
268 | THREAD->udebug.go == false || |
328 | (TASK->udebug.evmask & UDEBUG_EVMASK(etype)) == 0) { |
269 | (TASK->udebug.evmask & UDEBUG_EVMASK(etype)) == 0) { |
329 | mutex_unlock(&THREAD->udebug.lock); |
270 | mutex_unlock(&THREAD->udebug.lock); |
330 | mutex_unlock(&TASK->udebug.lock); |
271 | mutex_unlock(&TASK->udebug.lock); |
331 | return; |
272 | return; |
332 | } |
273 | } |
333 | 274 | ||
334 | //printf("udebug_syscall_event\n"); |
275 | //printf("udebug_syscall_event\n"); |
335 | call = THREAD->udebug.go_call; |
276 | call = THREAD->udebug.go_call; |
336 | THREAD->udebug.go_call = NULL; |
277 | THREAD->udebug.go_call = NULL; |
337 | 278 | ||
338 | IPC_SET_RETVAL(call->data, 0); |
279 | IPC_SET_RETVAL(call->data, 0); |
339 | IPC_SET_ARG1(call->data, etype); |
280 | IPC_SET_ARG1(call->data, etype); |
340 | IPC_SET_ARG2(call->data, id); |
281 | IPC_SET_ARG2(call->data, id); |
341 | IPC_SET_ARG3(call->data, rc); |
282 | IPC_SET_ARG3(call->data, rc); |
342 | //printf("udebug_syscall_event/ipc_answer\n"); |
283 | //printf("udebug_syscall_event/ipc_answer\n"); |
343 | 284 | ||
344 | THREAD->udebug.syscall_args[0] = a1; |
285 | THREAD->udebug.syscall_args[0] = a1; |
345 | THREAD->udebug.syscall_args[1] = a2; |
286 | THREAD->udebug.syscall_args[1] = a2; |
346 | THREAD->udebug.syscall_args[2] = a3; |
287 | THREAD->udebug.syscall_args[2] = a3; |
347 | THREAD->udebug.syscall_args[3] = a4; |
288 | THREAD->udebug.syscall_args[3] = a4; |
348 | THREAD->udebug.syscall_args[4] = a5; |
289 | THREAD->udebug.syscall_args[4] = a5; |
349 | THREAD->udebug.syscall_args[5] = a6; |
290 | THREAD->udebug.syscall_args[5] = a6; |
350 | 291 | ||
351 | /* |
292 | /* |
352 | * Make sure udebug.go is false when going to sleep |
293 | * Make sure udebug.go is false when going to sleep |
353 | * in case we get woken up by DEBUG_END. (At which |
294 | * in case we get woken up by DEBUG_END. (At which |
354 | * point it must be back to the initial true value). |
295 | * point it must be back to the initial true value). |
355 | */ |
296 | */ |
356 | THREAD->udebug.go = false; |
297 | THREAD->udebug.go = false; |
357 | THREAD->udebug.cur_event = etype; |
298 | THREAD->udebug.cur_event = etype; |
358 | 299 | ||
359 | ipc_answer(&TASK->answerbox, call); |
300 | ipc_answer(&TASK->answerbox, call); |
360 | 301 | ||
361 | mutex_unlock(&THREAD->udebug.lock); |
302 | mutex_unlock(&THREAD->udebug.lock); |
362 | mutex_unlock(&TASK->udebug.lock); |
303 | mutex_unlock(&TASK->udebug.lock); |
363 | 304 | ||
364 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
305 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
365 | - | ||
366 | udebug_int_unlock(); |
- | |
367 | } |
306 | } |
368 | 307 | ||
369 | /** Thread-creation event hook. |
308 | /** Thread-creation event hook combined with attaching the thread. |
370 | * |
309 | * |
371 | * Must be called when a new userspace thread is created in the debugged |
310 | * Must be called when a new userspace thread is created in the debugged |
- | 311 | * task. Generates a THREAD_B event. Also attaches the thread @a t |
|
- | 312 | * to the task @a ta. |
|
- | 313 | * |
|
- | 314 | * This is necessary to avoid a race condition where the BEGIN and THREAD_READ |
|
- | 315 | * requests would be handled inbetween attaching the thread and checking it |
|
- | 316 | * for being in a debugging session to send the THREAD_B event. We could then |
|
- | 317 | * either miss threads or get some threads both in the thread list |
|
372 | * task. Generates a THREAD_B event. |
318 | * and get a THREAD_B event for them. |
373 | * |
319 | * |
374 | * @param t Structure of the thread being created. Not locked, as the |
320 | * @param t Structure of the thread being created. Not locked, as the |
375 | * thread is not executing yet. |
321 | * thread is not executing yet. |
- | 322 | * @param ta Task to which the thread should be attached. |
|
376 | */ |
323 | */ |
377 | void udebug_thread_b_event(struct thread *t) |
324 | void udebug_thread_b_event_attach(struct thread *t, struct task *ta) |
378 | { |
325 | { |
379 | call_t *call; |
326 | call_t *call; |
380 | 327 | ||
381 | udebug_int_lock(); |
- | |
382 | - | ||
383 | mutex_lock(&TASK->udebug.lock); |
328 | mutex_lock(&TASK->udebug.lock); |
384 | mutex_lock(&THREAD->udebug.lock); |
329 | mutex_lock(&THREAD->udebug.lock); |
385 | 330 | ||
- | 331 | thread_attach(t, ta); |
|
- | 332 | ||
386 | LOG("udebug_thread_b_event\n"); |
333 | LOG("udebug_thread_b_event\n"); |
387 | LOG("- check state\n"); |
334 | LOG("- check state\n"); |
388 | 335 | ||
389 | /* Must only generate events when in debugging session */ |
336 | /* Must only generate events when in debugging session */ |
390 | if (THREAD->udebug.debug_active != true) { |
337 | if (THREAD->udebug.debug_active != true) { |
391 | LOG("- debug_active: %s, udebug.go: %s\n", |
338 | LOG("- debug_active: %s, udebug.go: %s\n", |
392 | THREAD->udebug.debug_active ? "yes(+)" : "no(-)", |
339 | THREAD->udebug.debug_active ? "yes(+)" : "no(-)", |
393 | THREAD->udebug.go ? "yes(-)" : "no(+)"); |
340 | THREAD->udebug.go ? "yes(-)" : "no(+)"); |
394 | mutex_unlock(&THREAD->udebug.lock); |
341 | mutex_unlock(&THREAD->udebug.lock); |
395 | mutex_unlock(&TASK->udebug.lock); |
342 | mutex_unlock(&TASK->udebug.lock); |
396 | return; |
343 | return; |
397 | } |
344 | } |
398 | 345 | ||
399 | LOG("- trigger event\n"); |
346 | LOG("- trigger event\n"); |
400 | 347 | ||
401 | call = THREAD->udebug.go_call; |
348 | call = THREAD->udebug.go_call; |
402 | THREAD->udebug.go_call = NULL; |
349 | THREAD->udebug.go_call = NULL; |
403 | IPC_SET_RETVAL(call->data, 0); |
350 | IPC_SET_RETVAL(call->data, 0); |
404 | IPC_SET_ARG1(call->data, UDEBUG_EVENT_THREAD_B); |
351 | IPC_SET_ARG1(call->data, UDEBUG_EVENT_THREAD_B); |
405 | IPC_SET_ARG2(call->data, (unative_t)t); |
352 | IPC_SET_ARG2(call->data, (unative_t)t); |
406 | 353 | ||
407 | /* |
354 | /* |
408 | * Make sure udebug.go is false when going to sleep |
355 | * Make sure udebug.go is false when going to sleep |
409 | * in case we get woken up by DEBUG_END. (At which |
356 | * in case we get woken up by DEBUG_END. (At which |
410 | * point it must be back to the initial true value). |
357 | * point it must be back to the initial true value). |
411 | */ |
358 | */ |
412 | THREAD->udebug.go = false; |
359 | THREAD->udebug.go = false; |
413 | THREAD->udebug.cur_event = UDEBUG_EVENT_THREAD_B; |
360 | THREAD->udebug.cur_event = UDEBUG_EVENT_THREAD_B; |
414 | 361 | ||
415 | ipc_answer(&TASK->answerbox, call); |
362 | ipc_answer(&TASK->answerbox, call); |
416 | 363 | ||
417 | mutex_unlock(&THREAD->udebug.lock); |
364 | mutex_unlock(&THREAD->udebug.lock); |
418 | mutex_unlock(&TASK->udebug.lock); |
365 | mutex_unlock(&TASK->udebug.lock); |
419 | 366 | ||
420 | LOG("- sleep\n"); |
367 | LOG("- sleep\n"); |
421 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
368 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
422 | - | ||
423 | udebug_int_unlock(); |
- | |
424 | } |
369 | } |
425 | 370 | ||
426 | /** Thread-termination event hook. |
371 | /** Thread-termination event hook. |
427 | * |
372 | * |
428 | * Must be called when the current thread is terminating. |
373 | * Must be called when the current thread is terminating. |
429 | * Generates a THREAD_E event. |
374 | * Generates a THREAD_E event. |
430 | */ |
375 | */ |
431 | void udebug_thread_e_event(void) |
376 | void udebug_thread_e_event(void) |
432 | { |
377 | { |
433 | call_t *call; |
378 | call_t *call; |
434 | 379 | ||
435 | udebug_int_lock(); |
- | |
436 | - | ||
437 | mutex_lock(&TASK->udebug.lock); |
380 | mutex_lock(&TASK->udebug.lock); |
438 | mutex_lock(&THREAD->udebug.lock); |
381 | mutex_lock(&THREAD->udebug.lock); |
439 | 382 | ||
440 | LOG("udebug_thread_e_event\n"); |
383 | LOG("udebug_thread_e_event\n"); |
441 | LOG("- check state\n"); |
384 | LOG("- check state\n"); |
442 | 385 | ||
443 | /* Must only generate events when in debugging session. */ |
386 | /* Must only generate events when in debugging session. */ |
444 | if (THREAD->udebug.debug_active != true) { |
387 | if (THREAD->udebug.debug_active != true) { |
445 | /* printf("- debug_active: %s, udebug.go: %s\n", |
388 | /* printf("- debug_active: %s, udebug.go: %s\n", |
446 | THREAD->udebug.debug_active ? "yes(+)" : "no(-)", |
389 | THREAD->udebug.debug_active ? "yes(+)" : "no(-)", |
447 | THREAD->udebug.go ? "yes(-)" : "no(+)");*/ |
390 | THREAD->udebug.go ? "yes(-)" : "no(+)");*/ |
448 | mutex_unlock(&THREAD->udebug.lock); |
391 | mutex_unlock(&THREAD->udebug.lock); |
449 | mutex_unlock(&TASK->udebug.lock); |
392 | mutex_unlock(&TASK->udebug.lock); |
450 | return; |
393 | return; |
451 | } |
394 | } |
452 | 395 | ||
453 | LOG("- trigger event\n"); |
396 | LOG("- trigger event\n"); |
454 | 397 | ||
455 | call = THREAD->udebug.go_call; |
398 | call = THREAD->udebug.go_call; |
456 | THREAD->udebug.go_call = NULL; |
399 | THREAD->udebug.go_call = NULL; |
457 | IPC_SET_RETVAL(call->data, 0); |
400 | IPC_SET_RETVAL(call->data, 0); |
458 | IPC_SET_ARG1(call->data, UDEBUG_EVENT_THREAD_E); |
401 | IPC_SET_ARG1(call->data, UDEBUG_EVENT_THREAD_E); |
459 | 402 | ||
460 | /* Prevent any further debug activity in thread. */ |
403 | /* Prevent any further debug activity in thread. */ |
461 | THREAD->udebug.debug_active = false; |
404 | THREAD->udebug.debug_active = false; |
462 | THREAD->udebug.cur_event = 0; /* none */ |
405 | THREAD->udebug.cur_event = 0; /* none */ |
463 | THREAD->udebug.go = false; /* set to initial value */ |
406 | THREAD->udebug.go = false; /* set to initial value */ |
464 | 407 | ||
465 | ipc_answer(&TASK->answerbox, call); |
408 | ipc_answer(&TASK->answerbox, call); |
466 | 409 | ||
467 | mutex_unlock(&THREAD->udebug.lock); |
410 | mutex_unlock(&THREAD->udebug.lock); |
468 | mutex_unlock(&TASK->udebug.lock); |
411 | mutex_unlock(&TASK->udebug.lock); |
469 | 412 | ||
470 | /* Leave int_lock enabled. */ |
413 | /* |
471 | /* This event does not sleep - debugging has finished in this thread. */ |
414 | * This event does not sleep - debugging has finished |
- | 415 | * in this thread. |
|
- | 416 | */ |
|
472 | } |
417 | } |
473 | 418 | ||
474 | /** |
419 | /** |
475 | * Terminate task debugging session. |
420 | * Terminate task debugging session. |
476 | * |
421 | * |
477 | * Gracefully terminates the debugging session for a task. If the debugger |
422 | * Gracefully terminates the debugging session for a task. If the debugger |
478 | * is still waiting for events on some threads, it will receive a |
423 | * is still waiting for events on some threads, it will receive a |
479 | * FINISHED event for each of them. |
424 | * FINISHED event for each of them. |
480 | * |
425 | * |
481 | * @param ta Task structure. ta->udebug.lock must be already locked. |
426 | * @param ta Task structure. ta->udebug.lock must be already locked. |
482 | * @return Zero on success or negative error code. |
427 | * @return Zero on success or negative error code. |
483 | */ |
428 | */ |
484 | int udebug_task_cleanup(struct task *ta) |
429 | int udebug_task_cleanup(struct task *ta) |
485 | { |
430 | { |
486 | thread_t *t; |
431 | thread_t *t; |
487 | link_t *cur; |
432 | link_t *cur; |
488 | int flags; |
433 | int flags; |
489 | ipl_t ipl; |
434 | ipl_t ipl; |
490 | 435 | ||
491 | LOG("udebug_task_cleanup()\n"); |
436 | LOG("udebug_task_cleanup()\n"); |
492 | LOG("task %" PRIu64 "\n", ta->taskid); |
437 | LOG("task %" PRIu64 "\n", ta->taskid); |
493 | 438 | ||
494 | udebug_int_lock(); |
- | |
495 | - | ||
496 | if (ta->udebug.dt_state != UDEBUG_TS_BEGINNING && |
439 | if (ta->udebug.dt_state != UDEBUG_TS_BEGINNING && |
497 | ta->udebug.dt_state != UDEBUG_TS_ACTIVE) { |
440 | ta->udebug.dt_state != UDEBUG_TS_ACTIVE) { |
498 | LOG("udebug_task_cleanup(): task not being debugged\n"); |
441 | LOG("udebug_task_cleanup(): task not being debugged\n"); |
499 | return EINVAL; |
442 | return EINVAL; |
500 | } |
443 | } |
501 | 444 | ||
502 | /* Finish debugging of all userspace threads */ |
445 | /* Finish debugging of all userspace threads */ |
503 | for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) { |
446 | for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) { |
504 | t = list_get_instance(cur, thread_t, th_link); |
447 | t = list_get_instance(cur, thread_t, th_link); |
505 | 448 | ||
506 | mutex_lock(&t->udebug.lock); |
449 | mutex_lock(&t->udebug.lock); |
507 | 450 | ||
508 | ipl = interrupts_disable(); |
451 | ipl = interrupts_disable(); |
509 | spinlock_lock(&t->lock); |
452 | spinlock_lock(&t->lock); |
510 | 453 | ||
511 | flags = t->flags; |
454 | flags = t->flags; |
512 | 455 | ||
513 | spinlock_unlock(&t->lock); |
456 | spinlock_unlock(&t->lock); |
514 | interrupts_restore(ipl); |
457 | interrupts_restore(ipl); |
515 | 458 | ||
516 | /* Only process userspace threads. */ |
459 | /* Only process userspace threads. */ |
517 | if ((flags & THREAD_FLAG_USPACE) != 0) { |
460 | if ((flags & THREAD_FLAG_USPACE) != 0) { |
518 | /* Prevent any further debug activity in thread. */ |
461 | /* Prevent any further debug activity in thread. */ |
519 | t->udebug.debug_active = false; |
462 | t->udebug.debug_active = false; |
520 | t->udebug.cur_event = 0; /* none */ |
463 | t->udebug.cur_event = 0; /* none */ |
521 | 464 | ||
522 | /* Is the thread still go? */ |
465 | /* Is the thread still go? */ |
523 | if (t->udebug.go == true) { |
466 | if (t->udebug.go == true) { |
524 | /* |
467 | /* |
525 | * Yes, so clear go. As debug_active == false, |
468 | * Yes, so clear go. As debug_active == false, |
526 | * this doesn't affect anything. |
469 | * this doesn't affect anything. |
527 | */ |
470 | */ |
528 | t->udebug.go = false; |
471 | t->udebug.go = false; |
529 | 472 | ||
530 | /* Answer GO call */ |
473 | /* Answer GO call */ |
531 | LOG("answer GO call with EVENT_FINISHED\n"); |
474 | LOG("answer GO call with EVENT_FINISHED\n"); |
532 | IPC_SET_RETVAL(t->udebug.go_call->data, 0); |
475 | IPC_SET_RETVAL(t->udebug.go_call->data, 0); |
533 | IPC_SET_ARG1(t->udebug.go_call->data, |
476 | IPC_SET_ARG1(t->udebug.go_call->data, |
534 | UDEBUG_EVENT_FINISHED); |
477 | UDEBUG_EVENT_FINISHED); |
535 | 478 | ||
536 | ipc_answer(&ta->answerbox, t->udebug.go_call); |
479 | ipc_answer(&ta->answerbox, t->udebug.go_call); |
537 | t->udebug.go_call = NULL; |
480 | t->udebug.go_call = NULL; |
538 | } else { |
481 | } else { |
539 | /* |
482 | /* |
540 | * Debug_stop is already at initial value. |
483 | * Debug_stop is already at initial value. |
541 | * Yet this means the thread needs waking up. |
484 | * Yet this means the thread needs waking up. |
542 | */ |
485 | */ |
543 | 486 | ||
544 | /* |
487 | /* |
545 | * t's lock must not be held when calling |
488 | * t's lock must not be held when calling |
546 | * waitq_wakeup. |
489 | * waitq_wakeup. |
547 | */ |
490 | */ |
548 | waitq_wakeup(&t->udebug.go_wq, WAKEUP_FIRST); |
491 | waitq_wakeup(&t->udebug.go_wq, WAKEUP_FIRST); |
549 | } |
492 | } |
550 | } |
493 | } |
551 | mutex_unlock(&t->udebug.lock); |
494 | mutex_unlock(&t->udebug.lock); |
552 | } |
495 | } |
553 | 496 | ||
554 | ta->udebug.dt_state = UDEBUG_TS_INACTIVE; |
497 | ta->udebug.dt_state = UDEBUG_TS_INACTIVE; |
555 | ta->udebug.debugger = NULL; |
498 | ta->udebug.debugger = NULL; |
556 | 499 | ||
557 | udebug_int_unlock(); |
- | |
558 | - | ||
559 | return 0; |
500 | return 0; |
560 | } |
501 | } |
561 | 502 | ||
562 | 503 | ||
563 | /** @} |
504 | /** @} |
564 | */ |
505 | */ |
565 | 506 |