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