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| Rev 3674 | Rev 4337 | ||
|---|---|---|---|
| Line 56... | Line 56... | ||
| 56 | * but only if it verifies all conditions. |
56 | * but only if it verifies all conditions. |
| 57 | * |
57 | * |
| 58 | * Specifically, verifies that thread t exists, is a userspace thread, |
58 | * Specifically, verifies that thread t exists, is a userspace thread, |
| 59 | * and belongs to the current task (TASK). Verifies, that the thread |
59 | * and belongs to the current task (TASK). Verifies, that the thread |
| 60 | * is (or is not) go according to being_go (typically false). |
60 | * is (or is not) go according to being_go (typically false). |
| 61 | * It also locks t->udebug.lock, making sure that t->udebug.debug_active |
61 | * It also locks t->udebug.lock, making sure that t->udebug.active |
| 62 | * is true - that the thread is in a valid debugging session. |
62 | * is true - that the thread is in a valid debugging session. |
| 63 | * |
63 | * |
| 64 | * With this verified and the t->udebug.lock mutex held, it is ensured |
64 | * With this verified and the t->udebug.lock mutex held, it is ensured |
| 65 | * that the thread cannot leave the debugging session, let alone cease |
65 | * that the thread cannot leave the debugging session, let alone cease |
| 66 | * to exist. |
66 | * to exist. |
| Line 106... | Line 106... | ||
| 106 | mutex_unlock(&TASK->udebug.lock); |
106 | mutex_unlock(&TASK->udebug.lock); |
| 107 | return ENOENT; |
107 | return ENOENT; |
| 108 | } |
108 | } |
| 109 | 109 | ||
| 110 | /* Verify debugging state. */ |
110 | /* Verify debugging state. */ |
| 111 | if (t->udebug.debug_active != true) { |
111 | if (t->udebug.active != true) { |
| 112 | /* Not in debugging session or undesired GO state */ |
112 | /* Not in debugging session or undesired GO state */ |
| 113 | spinlock_unlock(&t->lock); |
113 | spinlock_unlock(&t->lock); |
| 114 | interrupts_restore(ipl); |
114 | interrupts_restore(ipl); |
| 115 | mutex_unlock(&TASK->udebug.lock); |
115 | mutex_unlock(&TASK->udebug.lock); |
| 116 | return ENOENT; |
116 | return ENOENT; |
| 117 | } |
117 | } |
| 118 | 118 | ||
| 119 | /* |
119 | /* |
| 120 | * Since the thread has debug_active == true, TASK->udebug.lock |
120 | * Since the thread has active == true, TASK->udebug.lock |
| 121 | * is enough to ensure its existence and that debug_active remains |
121 | * is enough to ensure its existence and that active remains |
| 122 | * true. |
122 | * true. |
| 123 | */ |
123 | */ |
| 124 | spinlock_unlock(&t->lock); |
124 | spinlock_unlock(&t->lock); |
| 125 | interrupts_restore(ipl); |
125 | interrupts_restore(ipl); |
| 126 | 126 | ||
| Line 202... | Line 202... | ||
| 202 | reply = 1; /* immediate reply */ |
202 | reply = 1; /* immediate reply */ |
| 203 | } else { |
203 | } else { |
| 204 | reply = 0; /* no reply */ |
204 | reply = 0; /* no reply */ |
| 205 | } |
205 | } |
| 206 | 206 | ||
| 207 | /* Set udebug.debug_active on all of the task's userspace threads. */ |
207 | /* Set udebug.active on all of the task's userspace threads. */ |
| 208 | 208 | ||
| 209 | for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) { |
209 | for (cur = TASK->th_head.next; cur != &TASK->th_head; cur = cur->next) { |
| 210 | t = list_get_instance(cur, thread_t, th_link); |
210 | t = list_get_instance(cur, thread_t, th_link); |
| 211 | 211 | ||
| 212 | mutex_lock(&t->udebug.lock); |
212 | mutex_lock(&t->udebug.lock); |
| 213 | if ((t->flags & THREAD_FLAG_USPACE) != 0) |
213 | if ((t->flags & THREAD_FLAG_USPACE) != 0) |
| 214 | t->udebug.debug_active = true; |
214 | t->udebug.active = true; |
| 215 | mutex_unlock(&t->udebug.lock); |
215 | mutex_unlock(&t->udebug.lock); |
| 216 | } |
216 | } |
| 217 | 217 | ||
| 218 | mutex_unlock(&TASK->udebug.lock); |
218 | mutex_unlock(&TASK->udebug.lock); |
| 219 | 219 | ||