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