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2894 | svoboda | 1 | /* |
2 | * Copyright (c) 2008 Jiri Svoboda |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
2801 | svoboda | 29 | /** @addtogroup generic |
30 | * @{ |
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31 | */ |
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32 | |||
33 | /** |
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34 | * @file |
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2894 | svoboda | 35 | * @brief Udebug. |
3031 | svoboda | 36 | * |
37 | * Functions in this file are executed directly in each thread, which |
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38 | * may or may not be the subject of debugging. The udebug_stoppable_begin/end() |
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39 | * functions are also executed in the clock interrupt handler. To avoid |
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40 | * deadlock, functions in this file are protected from the interrupt |
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41 | * by locking the recursive lock THREAD->udebug.int_lock (just an atomic |
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42 | * variable). This prevents udebug_stoppable_begin/end() from being |
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43 | * executed in the interrupt handler (they are skipped). |
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44 | * |
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45 | * Functions in udebug_ops.c and udebug_ipc.c execute in different threads, |
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46 | * so they needn't be protected from the (preemptible) interrupt-initiated |
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47 | * code. |
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2801 | svoboda | 48 | */ |
49 | |||
50 | #include <synch/waitq.h> |
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51 | #include <console/klog.h> |
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2813 | svoboda | 52 | #include <udebug/udebug.h> |
2870 | svoboda | 53 | #include <errno.h> |
2801 | svoboda | 54 | #include <arch.h> |
55 | |||
3026 | svoboda | 56 | static inline void udebug_int_lock(void) |
57 | { |
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58 | atomic_inc(&THREAD->udebug.int_lock); |
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59 | } |
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60 | |||
61 | static inline void udebug_int_unlock(void) |
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62 | { |
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63 | atomic_dec(&THREAD->udebug.int_lock); |
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64 | } |
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65 | |||
3014 | svoboda | 66 | void udebug_task_init(udebug_task_t *ut) |
67 | { |
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3016 | svoboda | 68 | mutex_initialize(&ut->lock); |
3014 | svoboda | 69 | ut->dt_state = UDEBUG_TS_INACTIVE; |
70 | ut->begin_call = NULL; |
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71 | ut->not_stoppable_count = 0; |
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72 | ut->evmask = 0; |
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73 | } |
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74 | |||
3018 | svoboda | 75 | void udebug_thread_initialize(udebug_thread_t *ut) |
76 | { |
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3026 | svoboda | 77 | mutex_initialize(&ut->lock); |
3018 | svoboda | 78 | waitq_initialize(&ut->go_wq); |
3026 | svoboda | 79 | |
80 | /* |
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81 | * At the beginning the thread is stoppable, so int_lock be set, too. |
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82 | */ |
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83 | atomic_set(&ut->int_lock, 1); |
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84 | |||
3018 | svoboda | 85 | ut->go_call = NULL; |
86 | ut->uspace_state = NULL; |
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87 | ut->stop = true; |
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88 | ut->stoppable = true; |
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89 | ut->debug_active = false; |
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90 | ut->cur_event = 0; /* none */ |
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91 | } |
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92 | |||
2917 | svoboda | 93 | static void udebug_wait_for_go(waitq_t *wq) |
94 | { |
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95 | int rc; |
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96 | ipl_t ipl; |
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97 | |||
98 | ipl = waitq_sleep_prepare(wq); |
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99 | |||
100 | wq->missed_wakeups = 0; /* Enforce blocking. */ |
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101 | rc = waitq_sleep_timeout_unsafe(wq, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE); |
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102 | |||
103 | waitq_sleep_finish(wq, rc, ipl); |
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104 | } |
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105 | |||
3030 | svoboda | 106 | /** Do a preliminary check that a debugging session is in progress. |
107 | * |
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108 | * This only requires the THREAD->udebug.lock mutex (and not |
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109 | * TASK->udebug.lock mutex). For an undebugged task, this will |
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110 | * never block (while there could be collisions by different threads |
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111 | * on the TASK mutex), thus improving SMP perormance for undebugged tasks. |
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112 | */ |
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113 | static bool udebug_thread_precheck(void) |
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114 | { |
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115 | bool res; |
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116 | |||
117 | mutex_lock(&THREAD->udebug.lock); |
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118 | res = THREAD->udebug.debug_active; |
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119 | mutex_unlock(&THREAD->udebug.lock); |
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120 | |||
121 | return res; |
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122 | } |
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123 | |||
2804 | svoboda | 124 | void udebug_stoppable_begin(void) |
2801 | svoboda | 125 | { |
2804 | svoboda | 126 | int nsc; |
2898 | svoboda | 127 | call_t *db_call, *go_call; |
2804 | svoboda | 128 | |
2902 | svoboda | 129 | ASSERT(THREAD); |
130 | ASSERT(TASK); |
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131 | |||
3026 | svoboda | 132 | udebug_int_lock(); |
133 | |||
3030 | svoboda | 134 | /* Early check for undebugged tasks */ |
135 | if (!udebug_thread_precheck()) { |
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136 | udebug_int_unlock(); |
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137 | return; |
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138 | } |
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139 | |||
3016 | svoboda | 140 | mutex_lock(&TASK->udebug.lock); |
2804 | svoboda | 141 | |
3014 | svoboda | 142 | nsc = --TASK->udebug.not_stoppable_count; |
2804 | svoboda | 143 | |
3032 | svoboda | 144 | /* Lock order OK, THREAD->udebug.lock is after TASK->udebug.lock */ |
145 | mutex_lock(&THREAD->udebug.lock); |
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146 | ASSERT(THREAD->udebug.stoppable == false); |
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147 | THREAD->udebug.stoppable = true; |
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2804 | svoboda | 148 | |
3014 | svoboda | 149 | if (TASK->udebug.dt_state == UDEBUG_TS_BEGINNING && nsc == 0) { |
2898 | svoboda | 150 | /* |
151 | * This was the last non-stoppable thread. Reply to |
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152 | * DEBUG_BEGIN call. |
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153 | */ |
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154 | |||
3014 | svoboda | 155 | db_call = TASK->udebug.begin_call; |
2902 | svoboda | 156 | ASSERT(db_call); |
157 | |||
3014 | svoboda | 158 | TASK->udebug.dt_state = UDEBUG_TS_ACTIVE; |
159 | TASK->udebug.begin_call = NULL; |
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2804 | svoboda | 160 | |
161 | IPC_SET_RETVAL(db_call->data, 0); |
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162 | ipc_answer(&TASK->answerbox, db_call); |
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2898 | svoboda | 163 | |
3014 | svoboda | 164 | } else if (TASK->udebug.dt_state == UDEBUG_TS_ACTIVE) { |
2898 | svoboda | 165 | /* |
166 | * Active debugging session |
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167 | */ |
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168 | |||
3018 | svoboda | 169 | if (THREAD->udebug.debug_active && THREAD->udebug.stop) { |
2898 | svoboda | 170 | /* |
171 | * Thread was requested to stop - answer go call |
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172 | */ |
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173 | |||
174 | /* Make sure nobody takes this call away from us */ |
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3018 | svoboda | 175 | go_call = THREAD->udebug.go_call; |
176 | THREAD->udebug.go_call = NULL; |
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2902 | svoboda | 177 | ASSERT(go_call); |
2898 | svoboda | 178 | |
179 | IPC_SET_RETVAL(go_call->data, 0); |
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180 | IPC_SET_ARG1(go_call->data, UDEBUG_EVENT_STOP); |
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181 | |||
3018 | svoboda | 182 | THREAD->udebug.cur_event = UDEBUG_EVENT_STOP; |
2898 | svoboda | 183 | |
184 | ipc_answer(&TASK->answerbox, go_call); |
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185 | } |
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3032 | svoboda | 186 | } |
2898 | svoboda | 187 | |
3032 | svoboda | 188 | mutex_unlock(&THREAD->udebug.lock); |
189 | mutex_unlock(&TASK->udebug.lock); |
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2804 | svoboda | 190 | } |
191 | |||
192 | void udebug_stoppable_end(void) |
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193 | { |
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3030 | svoboda | 194 | /* Early check for undebugged tasks */ |
195 | if (!udebug_thread_precheck()) { |
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196 | udebug_int_unlock(); |
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197 | return; |
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198 | } |
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199 | |||
2804 | svoboda | 200 | restart: |
3016 | svoboda | 201 | mutex_lock(&TASK->udebug.lock); |
3026 | svoboda | 202 | mutex_lock(&THREAD->udebug.lock); |
2898 | svoboda | 203 | |
3018 | svoboda | 204 | if (THREAD->udebug.debug_active && |
205 | THREAD->udebug.stop == true) { |
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3014 | svoboda | 206 | TASK->udebug.begin_call = NULL; |
3026 | svoboda | 207 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 208 | mutex_unlock(&TASK->udebug.lock); |
2823 | svoboda | 209 | |
3018 | svoboda | 210 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
2917 | svoboda | 211 | |
2804 | svoboda | 212 | goto restart; |
213 | /* must try again - have to lose stoppability atomically */ |
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214 | } else { |
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3014 | svoboda | 215 | ++TASK->udebug.not_stoppable_count; |
3026 | svoboda | 216 | ASSERT(THREAD->udebug.stoppable == true); |
3018 | svoboda | 217 | THREAD->udebug.stoppable = false; |
2898 | svoboda | 218 | |
3026 | svoboda | 219 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 220 | mutex_unlock(&TASK->udebug.lock); |
2801 | svoboda | 221 | } |
3026 | svoboda | 222 | |
223 | udebug_int_unlock(); |
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2801 | svoboda | 224 | } |
225 | |||
3015 | svoboda | 226 | /** Upon being scheduled to run, check if the current thread should stop. |
227 | * |
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228 | * This function is called from clock(). Preemption is enabled. |
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229 | * interrupts are disabled, but since this is called after |
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230 | * being scheduled-in, we can enable them, if we're careful enough |
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3026 | svoboda | 231 | * not to allow arbitrary recursion or deadlock with the thread context. |
3015 | svoboda | 232 | */ |
233 | void udebug_before_thread_runs(void) |
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234 | { |
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235 | ipl_t ipl; |
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236 | |||
3026 | svoboda | 237 | ASSERT(!PREEMPTION_DISABLED); |
238 | |||
239 | /* |
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240 | * Prevent agains re-entering, such as when preempted inside this |
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241 | * function. |
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242 | */ |
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243 | if (atomic_get(&THREAD->udebug.int_lock) != 0) |
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3015 | svoboda | 244 | return; |
245 | |||
3026 | svoboda | 246 | udebug_int_lock(); |
247 | |||
3015 | svoboda | 248 | ipl = interrupts_enable(); |
249 | |||
3016 | svoboda | 250 | /* Now we're free to do whatever we need (lock mutexes, sleep, etc.) */ |
3015 | svoboda | 251 | |
252 | /* Check if we're supposed to stop */ |
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253 | udebug_stoppable_begin(); |
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254 | udebug_stoppable_end(); |
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255 | |||
256 | interrupts_restore(ipl); |
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3026 | svoboda | 257 | |
258 | udebug_int_unlock(); |
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3015 | svoboda | 259 | } |
260 | |||
2805 | svoboda | 261 | void udebug_syscall_event(unative_t a1, unative_t a2, unative_t a3, |
2901 | svoboda | 262 | unative_t a4, unative_t a5, unative_t a6, unative_t id, unative_t rc, |
263 | bool end_variant) |
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2801 | svoboda | 264 | { |
2805 | svoboda | 265 | call_t *call; |
2901 | svoboda | 266 | udebug_event_t etype; |
2805 | svoboda | 267 | |
2901 | svoboda | 268 | etype = end_variant ? UDEBUG_EVENT_SYSCALL_E : UDEBUG_EVENT_SYSCALL_B; |
269 | |||
3026 | svoboda | 270 | udebug_int_lock(); |
271 | |||
3030 | svoboda | 272 | /* Early check for undebugged tasks */ |
273 | if (!udebug_thread_precheck()) { |
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274 | udebug_int_unlock(); |
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275 | return; |
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276 | } |
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277 | |||
3016 | svoboda | 278 | mutex_lock(&TASK->udebug.lock); |
3026 | svoboda | 279 | mutex_lock(&THREAD->udebug.lock); |
3016 | svoboda | 280 | |
2854 | svoboda | 281 | /* Must only generate events when in debugging session and have go */ |
3018 | svoboda | 282 | if (THREAD->udebug.debug_active != true || |
283 | THREAD->udebug.stop == true || |
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3014 | svoboda | 284 | (TASK->udebug.evmask & UDEBUG_EVMASK(etype)) == 0) { |
3026 | svoboda | 285 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 286 | mutex_unlock(&TASK->udebug.lock); |
2867 | svoboda | 287 | return; |
288 | } |
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2804 | svoboda | 289 | |
2913 | svoboda | 290 | //klog_printf("udebug_syscall_event"); |
3018 | svoboda | 291 | call = THREAD->udebug.go_call; |
292 | THREAD->udebug.go_call = NULL; |
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3016 | svoboda | 293 | |
2867 | svoboda | 294 | IPC_SET_RETVAL(call->data, 0); |
2901 | svoboda | 295 | IPC_SET_ARG1(call->data, etype); |
2867 | svoboda | 296 | IPC_SET_ARG2(call->data, id); |
297 | IPC_SET_ARG3(call->data, rc); |
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2913 | svoboda | 298 | //klog_printf("udebug_syscall_event/ipc_answer"); |
2805 | svoboda | 299 | |
3018 | svoboda | 300 | THREAD->udebug.syscall_args[0] = a1; |
301 | THREAD->udebug.syscall_args[1] = a2; |
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302 | THREAD->udebug.syscall_args[2] = a3; |
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303 | THREAD->udebug.syscall_args[3] = a4; |
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304 | THREAD->udebug.syscall_args[4] = a5; |
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305 | THREAD->udebug.syscall_args[5] = a6; |
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2866 | svoboda | 306 | |
2867 | svoboda | 307 | /* |
3018 | svoboda | 308 | * Make sure udebug.stop is true when going to sleep |
2867 | svoboda | 309 | * in case we get woken up by DEBUG_END. (At which |
310 | * point it must be back to the initial true value). |
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311 | */ |
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3018 | svoboda | 312 | THREAD->udebug.stop = true; |
313 | THREAD->udebug.cur_event = etype; |
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2867 | svoboda | 314 | |
3016 | svoboda | 315 | ipc_answer(&TASK->answerbox, call); |
316 | |||
3032 | svoboda | 317 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 318 | mutex_unlock(&TASK->udebug.lock); |
319 | |||
3018 | svoboda | 320 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
3026 | svoboda | 321 | |
322 | udebug_int_unlock(); |
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2867 | svoboda | 323 | } |
324 | |||
2903 | svoboda | 325 | void udebug_thread_b_event(struct thread *t) |
2867 | svoboda | 326 | { |
327 | call_t *call; |
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328 | |||
3026 | svoboda | 329 | udebug_int_lock(); |
330 | |||
3016 | svoboda | 331 | mutex_lock(&TASK->udebug.lock); |
3026 | svoboda | 332 | mutex_lock(&THREAD->udebug.lock); |
3016 | svoboda | 333 | |
2903 | svoboda | 334 | klog_printf("udebug_thread_b_event"); |
2867 | svoboda | 335 | klog_printf("- check state"); |
336 | |||
337 | /* Must only generate events when in debugging session */ |
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3018 | svoboda | 338 | if (THREAD->udebug.debug_active != true) { |
339 | klog_printf("- debug_active: %s, udebug.stop: %s", |
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340 | THREAD->udebug.debug_active ? "yes(+)" : "no(-)", |
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341 | THREAD->udebug.stop ? "yes(-)" : "no(+)"); |
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3026 | svoboda | 342 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 343 | mutex_unlock(&TASK->udebug.lock); |
2867 | svoboda | 344 | return; |
2801 | svoboda | 345 | } |
2867 | svoboda | 346 | |
347 | klog_printf("- trigger event"); |
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348 | |||
3018 | svoboda | 349 | call = THREAD->udebug.go_call; |
350 | THREAD->udebug.go_call = NULL; |
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2867 | svoboda | 351 | IPC_SET_RETVAL(call->data, 0); |
2903 | svoboda | 352 | IPC_SET_ARG1(call->data, UDEBUG_EVENT_THREAD_B); |
2867 | svoboda | 353 | IPC_SET_ARG2(call->data, (unative_t)t); |
354 | |||
355 | /* |
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3018 | svoboda | 356 | * Make sure udebug.stop is true when going to sleep |
2867 | svoboda | 357 | * in case we get woken up by DEBUG_END. (At which |
358 | * point it must be back to the initial true value). |
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359 | */ |
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3018 | svoboda | 360 | THREAD->udebug.stop = true; |
361 | THREAD->udebug.cur_event = UDEBUG_EVENT_THREAD_B; |
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2867 | svoboda | 362 | |
3016 | svoboda | 363 | ipc_answer(&TASK->answerbox, call); |
2867 | svoboda | 364 | |
3032 | svoboda | 365 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 366 | mutex_unlock(&TASK->udebug.lock); |
367 | |||
2867 | svoboda | 368 | klog_printf("- sleep"); |
3018 | svoboda | 369 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
3026 | svoboda | 370 | |
371 | udebug_int_unlock(); |
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2801 | svoboda | 372 | } |
373 | |||
2903 | svoboda | 374 | void udebug_thread_e_event(void) |
375 | { |
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376 | call_t *call; |
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377 | |||
3026 | svoboda | 378 | udebug_int_lock(); |
379 | |||
3016 | svoboda | 380 | mutex_lock(&TASK->udebug.lock); |
3026 | svoboda | 381 | mutex_lock(&THREAD->udebug.lock); |
3016 | svoboda | 382 | |
2903 | svoboda | 383 | klog_printf("udebug_thread_e_event"); |
384 | klog_printf("- check state"); |
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385 | |||
386 | /* Must only generate events when in debugging session */ |
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3018 | svoboda | 387 | if (THREAD->udebug.debug_active != true) { |
388 | klog_printf("- debug_active: %s, udebug.stop: %s", |
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389 | THREAD->udebug.debug_active ? "yes(+)" : "no(-)", |
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390 | THREAD->udebug.stop ? "yes(-)" : "no(+)"); |
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3026 | svoboda | 391 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 392 | mutex_unlock(&TASK->udebug.lock); |
2903 | svoboda | 393 | return; |
394 | } |
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395 | |||
396 | klog_printf("- trigger event"); |
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397 | |||
3018 | svoboda | 398 | call = THREAD->udebug.go_call; |
399 | THREAD->udebug.go_call = NULL; |
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2903 | svoboda | 400 | IPC_SET_RETVAL(call->data, 0); |
401 | IPC_SET_ARG1(call->data, UDEBUG_EVENT_THREAD_E); |
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402 | |||
2908 | svoboda | 403 | /* Prevent any further debug activity in thread */ |
3018 | svoboda | 404 | THREAD->udebug.debug_active = false; |
405 | THREAD->udebug.cur_event = 0; /* none */ |
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406 | THREAD->udebug.stop = true; /* set to initial value */ |
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3016 | svoboda | 407 | |
408 | ipc_answer(&TASK->answerbox, call); |
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2903 | svoboda | 409 | |
3032 | svoboda | 410 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 411 | mutex_unlock(&TASK->udebug.lock); |
2903 | svoboda | 412 | |
3026 | svoboda | 413 | /* Leave int_lock enabled */ |
2908 | svoboda | 414 | /* This event does not sleep - debugging has finished in this thread */ |
2903 | svoboda | 415 | } |
416 | |||
2921 | svoboda | 417 | static void breakpoint_trap_event(uintptr_t addr, udebug_event_t etype) |
2918 | svoboda | 418 | { |
419 | call_t *call; |
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2903 | svoboda | 420 | |
3026 | svoboda | 421 | udebug_int_lock(); |
422 | |||
3016 | svoboda | 423 | mutex_lock(&TASK->udebug.lock); |
3026 | svoboda | 424 | mutex_lock(&THREAD->udebug.lock); |
3016 | svoboda | 425 | |
2918 | svoboda | 426 | /* Must only generate events when in debugging session and have go */ |
3018 | svoboda | 427 | if (THREAD->udebug.debug_active != true || |
3030 | svoboda | 428 | THREAD->udebug.stop == true) { |
3026 | svoboda | 429 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 430 | mutex_unlock(&TASK->udebug.lock); |
3030 | svoboda | 431 | udebug_int_unlock(); |
2918 | svoboda | 432 | return; |
433 | } |
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434 | |||
3030 | svoboda | 435 | /* Verify that the event is enabled */ |
436 | if ((TASK->udebug.evmask & UDEBUG_EVMASK(etype)) == 0) { |
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437 | mutex_unlock(&THREAD->udebug.lock); |
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438 | mutex_unlock(&TASK->udebug.lock); |
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439 | udebug_int_unlock(); |
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440 | return; |
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441 | } |
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442 | |||
2921 | svoboda | 443 | klog_printf("udebug_breakpoint/trap_event"); |
3018 | svoboda | 444 | call = THREAD->udebug.go_call; |
445 | THREAD->udebug.go_call = NULL; |
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3016 | svoboda | 446 | |
2918 | svoboda | 447 | IPC_SET_RETVAL(call->data, 0); |
448 | IPC_SET_ARG1(call->data, etype); |
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449 | IPC_SET_ARG2(call->data, addr); |
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450 | |||
451 | /* |
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3018 | svoboda | 452 | * Make sure udebug.stop is true when going to sleep |
2918 | svoboda | 453 | * in case we get woken up by DEBUG_END. (At which |
454 | * point it must be back to the initial true value). |
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455 | */ |
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3018 | svoboda | 456 | THREAD->udebug.stop = true; |
457 | THREAD->udebug.cur_event = etype; |
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3026 | svoboda | 458 | |
2918 | svoboda | 459 | klog_printf("- send answer"); |
3032 | svoboda | 460 | ipc_answer(&TASK->answerbox, call); |
2918 | svoboda | 461 | |
3032 | svoboda | 462 | mutex_unlock(&THREAD->udebug.lock); |
3016 | svoboda | 463 | mutex_unlock(&TASK->udebug.lock); |
2918 | svoboda | 464 | |
3018 | svoboda | 465 | udebug_wait_for_go(&THREAD->udebug.go_wq); |
3026 | svoboda | 466 | |
467 | udebug_int_unlock(); |
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2918 | svoboda | 468 | } |
469 | |||
2921 | svoboda | 470 | void udebug_breakpoint_event(uintptr_t addr) |
471 | { |
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472 | breakpoint_trap_event(addr, UDEBUG_EVENT_BREAKPOINT); |
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473 | } |
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2918 | svoboda | 474 | |
2921 | svoboda | 475 | void udebug_trap_event(uintptr_t addr) |
476 | { |
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477 | breakpoint_trap_event(addr, UDEBUG_EVENT_TRAP); |
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478 | } |
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479 | |||
2870 | svoboda | 480 | /** |
481 | * Terminate task debugging session. |
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482 | * |
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3016 | svoboda | 483 | * \param ta->udebug.lock must be already locked. |
2870 | svoboda | 484 | * \return Zero on success or negative error code. |
485 | */ |
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486 | int udebug_task_cleanup(struct task *ta) |
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487 | { |
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488 | thread_t *t; |
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489 | link_t *cur; |
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490 | int flags; |
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3016 | svoboda | 491 | ipl_t ipl; |
2867 | svoboda | 492 | |
2870 | svoboda | 493 | klog_printf("udebug_task_cleanup()"); |
494 | klog_printf("task %llu", ta->taskid); |
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495 | |||
3026 | svoboda | 496 | udebug_int_lock(); |
497 | |||
3032 | svoboda | 498 | if (ta->udebug.dt_state != UDEBUG_TS_BEGINNING && |
3014 | svoboda | 499 | ta->udebug.dt_state != UDEBUG_TS_ACTIVE) { |
2870 | svoboda | 500 | klog_printf("udebug_task_cleanup(): task not being debugged"); |
501 | return EINVAL; |
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502 | } |
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503 | |||
504 | /* Finish debugging of all userspace threads */ |
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505 | for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) { |
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506 | t = list_get_instance(cur, thread_t, th_link); |
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507 | |||
3026 | svoboda | 508 | mutex_lock(&t->udebug.lock); |
509 | |||
3016 | svoboda | 510 | ipl = interrupts_disable(); |
2870 | svoboda | 511 | spinlock_lock(&t->lock); |
512 | |||
513 | flags = t->flags; |
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514 | |||
515 | spinlock_unlock(&t->lock); |
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3026 | svoboda | 516 | interrupts_restore(ipl); |
2870 | svoboda | 517 | |
518 | /* Only process userspace threads */ |
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519 | if ((flags & THREAD_FLAG_USPACE) != 0) { |
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520 | /* Prevent any further debug activity in thread */ |
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3018 | svoboda | 521 | t->udebug.debug_active = false; |
522 | t->udebug.cur_event = 0; /* none */ |
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2870 | svoboda | 523 | |
524 | /* Still has go? */ |
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3018 | svoboda | 525 | if (t->udebug.stop == false) { |
2870 | svoboda | 526 | /* |
527 | * Yes, so clear go. As debug_active == false, |
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528 | * this doesn't affect anything. |
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529 | */ |
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3018 | svoboda | 530 | t->udebug.stop = true; |
2870 | svoboda | 531 | |
532 | /* Answer GO call */ |
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533 | klog_printf("answer GO call with EVENT_FINISHED"); |
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3018 | svoboda | 534 | IPC_SET_RETVAL(t->udebug.go_call->data, 0); |
535 | IPC_SET_ARG1(t->udebug.go_call->data, UDEBUG_EVENT_FINISHED); |
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3026 | svoboda | 536 | |
3018 | svoboda | 537 | ipc_answer(&ta->answerbox, t->udebug.go_call); |
538 | t->udebug.go_call = NULL; |
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2870 | svoboda | 539 | } else { |
540 | /* |
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541 | * Debug_stop is already at initial value. |
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542 | * Yet this means the thread needs waking up. |
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543 | */ |
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544 | |||
545 | /* |
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546 | * t's lock must not be held when calling |
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547 | * waitq_wakeup. |
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548 | */ |
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3018 | svoboda | 549 | waitq_wakeup(&t->udebug.go_wq, WAKEUP_FIRST); |
2870 | svoboda | 550 | } |
551 | } |
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3026 | svoboda | 552 | mutex_unlock(&t->udebug.lock); |
2870 | svoboda | 553 | } |
554 | |||
3014 | svoboda | 555 | ta->udebug.dt_state = UDEBUG_TS_INACTIVE; |
556 | ta->udebug.debugger = NULL; |
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2870 | svoboda | 557 | |
3026 | svoboda | 558 | udebug_int_unlock(); |
559 | |||
2870 | svoboda | 560 | return 0; |
561 | } |
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562 | |||
563 | |||
2801 | svoboda | 564 | /** @} |
565 | */ |