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