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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. |
2801 | svoboda | 36 | */ |
37 | |||
38 | #include <synch/waitq.h> |
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39 | #include <console/klog.h> |
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2813 | svoboda | 40 | #include <udebug/udebug.h> |
2870 | svoboda | 41 | #include <errno.h> |
2801 | svoboda | 42 | #include <arch.h> |
43 | |||
3014 | svoboda | 44 | void udebug_task_init(udebug_task_t *ut) |
45 | { |
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46 | ut->dt_state = UDEBUG_TS_INACTIVE; |
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47 | ut->begin_call = NULL; |
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48 | ut->not_stoppable_count = 0; |
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49 | ut->evmask = 0; |
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50 | } |
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51 | |||
2917 | svoboda | 52 | static void udebug_wait_for_go(waitq_t *wq) |
53 | { |
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54 | int rc; |
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55 | ipl_t ipl; |
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56 | |||
57 | ipl = waitq_sleep_prepare(wq); |
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58 | |||
59 | wq->missed_wakeups = 0; /* Enforce blocking. */ |
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60 | rc = waitq_sleep_timeout_unsafe(wq, SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE); |
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61 | |||
62 | waitq_sleep_finish(wq, rc, ipl); |
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63 | } |
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64 | |||
2804 | svoboda | 65 | void udebug_stoppable_begin(void) |
2801 | svoboda | 66 | { |
2804 | svoboda | 67 | int nsc; |
2898 | svoboda | 68 | call_t *db_call, *go_call; |
2823 | svoboda | 69 | ipl_t ipl; |
2804 | svoboda | 70 | |
2902 | svoboda | 71 | ASSERT(THREAD); |
72 | ASSERT(TASK); |
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73 | |||
2823 | svoboda | 74 | ipl = interrupts_disable(); |
2804 | svoboda | 75 | spinlock_lock(&TASK->lock); |
76 | |||
3014 | svoboda | 77 | nsc = --TASK->udebug.not_stoppable_count; |
2804 | svoboda | 78 | |
3014 | svoboda | 79 | if (TASK->udebug.dt_state == UDEBUG_TS_BEGINNING) { |
2804 | svoboda | 80 | klog_printf("udebug_stoppable_begin"); |
81 | klog_printf(" - nsc := %d", nsc); |
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82 | } |
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83 | |||
3014 | svoboda | 84 | if (TASK->udebug.dt_state == UDEBUG_TS_BEGINNING && nsc == 0) { |
2898 | svoboda | 85 | /* |
86 | * This was the last non-stoppable thread. Reply to |
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87 | * DEBUG_BEGIN call. |
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88 | */ |
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89 | |||
3014 | svoboda | 90 | db_call = TASK->udebug.begin_call; |
2902 | svoboda | 91 | ASSERT(db_call); |
92 | |||
2898 | svoboda | 93 | /* Lock order OK, THREAD->debug_lock is after TASK->lock */ |
94 | spinlock_lock(&THREAD->debug_lock); |
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95 | THREAD->debug_stoppable = true; |
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96 | spinlock_unlock(&THREAD->debug_lock); |
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97 | |||
3014 | svoboda | 98 | TASK->udebug.dt_state = UDEBUG_TS_ACTIVE; |
99 | TASK->udebug.begin_call = NULL; |
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2804 | svoboda | 100 | spinlock_unlock(&TASK->lock); |
2823 | svoboda | 101 | interrupts_restore(ipl); |
2804 | svoboda | 102 | |
103 | IPC_SET_RETVAL(db_call->data, 0); |
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2913 | svoboda | 104 | //klog_printf("udebug_stoppable_begin/ipc_answer"); |
2804 | svoboda | 105 | ipc_answer(&TASK->answerbox, db_call); |
2898 | svoboda | 106 | |
3014 | svoboda | 107 | } else if (TASK->udebug.dt_state == UDEBUG_TS_ACTIVE) { |
2898 | svoboda | 108 | /* |
109 | * Active debugging session |
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110 | */ |
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111 | |||
112 | /* Lock order OK, THREAD->debug_lock is after TASK->lock */ |
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113 | spinlock_lock(&THREAD->debug_lock); |
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114 | THREAD->debug_stoppable = true; |
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115 | |||
2902 | svoboda | 116 | if (THREAD->debug_active && THREAD->debug_stop) { |
2898 | svoboda | 117 | /* |
118 | * Thread was requested to stop - answer go call |
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119 | */ |
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120 | |||
121 | /* Make sure nobody takes this call away from us */ |
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122 | go_call = THREAD->debug_go_call; |
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123 | THREAD->debug_go_call = NULL; |
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2902 | svoboda | 124 | ASSERT(go_call); |
2898 | svoboda | 125 | |
126 | IPC_SET_RETVAL(go_call->data, 0); |
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127 | IPC_SET_ARG1(go_call->data, UDEBUG_EVENT_STOP); |
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128 | |||
129 | THREAD->cur_event = UDEBUG_EVENT_STOP; |
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130 | spinlock_unlock(&THREAD->debug_lock); |
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131 | |||
132 | ipc_answer(&TASK->answerbox, go_call); |
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133 | |||
134 | spinlock_unlock(&TASK->lock); |
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135 | interrupts_restore(ipl); |
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136 | } else { |
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137 | /* |
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138 | * No stop request - nothing happens. |
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139 | */ |
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140 | spinlock_unlock(&THREAD->debug_lock); |
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141 | spinlock_unlock(&TASK->lock); |
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142 | interrupts_restore(ipl); |
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143 | } |
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2804 | svoboda | 144 | } else { |
2898 | svoboda | 145 | /* |
146 | * All other cases - nothing special happens. |
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147 | */ |
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148 | |||
149 | /* Lock order OK, THREAD->debug_lock is after TASK->lock */ |
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150 | spinlock_lock(&THREAD->debug_lock); |
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151 | THREAD->debug_stoppable = true; |
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152 | spinlock_unlock(&THREAD->debug_lock); |
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153 | |||
2804 | svoboda | 154 | spinlock_unlock(&TASK->lock); |
2823 | svoboda | 155 | interrupts_restore(ipl); |
2804 | svoboda | 156 | } |
157 | } |
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158 | |||
159 | void udebug_stoppable_end(void) |
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160 | { |
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2823 | svoboda | 161 | ipl_t ipl; |
162 | |||
2804 | svoboda | 163 | restart: |
2823 | svoboda | 164 | ipl = interrupts_disable(); |
2804 | svoboda | 165 | spinlock_lock(&TASK->lock); |
166 | |||
2898 | svoboda | 167 | /* Lock order OK, THREAD->debug_lock is after TASK->lock */ |
168 | spinlock_lock(&THREAD->debug_lock); |
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169 | |||
3014 | svoboda | 170 | if (TASK->udebug.dt_state == UDEBUG_TS_ACTIVE) { |
2913 | svoboda | 171 | //klog_printf("udebug_stoppable_end"); |
172 | //klog_printf("debug_stop=%d", THREAD->debug_stop); |
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2898 | svoboda | 173 | } |
174 | |||
2902 | svoboda | 175 | if (THREAD->debug_active && |
2825 | svoboda | 176 | THREAD->debug_stop == true) { |
3014 | svoboda | 177 | TASK->udebug.begin_call = NULL; |
2898 | svoboda | 178 | spinlock_unlock(&THREAD->debug_lock); |
2804 | svoboda | 179 | spinlock_unlock(&TASK->lock); |
2823 | svoboda | 180 | interrupts_restore(ipl); |
181 | |||
2917 | svoboda | 182 | udebug_wait_for_go(&THREAD->go_wq); |
183 | |||
2804 | svoboda | 184 | goto restart; |
185 | /* must try again - have to lose stoppability atomically */ |
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186 | } else { |
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3014 | svoboda | 187 | ++TASK->udebug.not_stoppable_count; |
2898 | svoboda | 188 | THREAD->debug_stoppable = false; |
189 | |||
190 | spinlock_unlock(&THREAD->debug_lock); |
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2804 | svoboda | 191 | spinlock_unlock(&TASK->lock); |
2823 | svoboda | 192 | interrupts_restore(ipl); |
2801 | svoboda | 193 | } |
194 | } |
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195 | |||
3015 | svoboda | 196 | /** Upon being scheduled to run, check if the current thread should stop. |
197 | * |
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198 | * This function is called from clock(). Preemption is enabled. |
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199 | * interrupts are disabled, but since this is called after |
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200 | * being scheduled-in, we can enable them, if we're careful enough |
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201 | * not to allow arbitrary recursion. |
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202 | */ |
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203 | void udebug_before_thread_runs(void) |
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204 | { |
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205 | ipl_t ipl; |
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206 | |||
207 | /* This will happen if we get preempted inside this function. */ |
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208 | if (THREAD->debug_in_before_thread_runs) |
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209 | return; |
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210 | |||
211 | THREAD->debug_in_before_thread_runs = true; |
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212 | ipl = interrupts_enable(); |
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213 | |||
214 | /* Now we're free to do whatever we need (lock mutexes, etc.) */ |
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215 | |||
216 | /* Check if we're supposed to stop */ |
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217 | udebug_stoppable_begin(); |
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218 | udebug_stoppable_end(); |
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219 | |||
220 | interrupts_restore(ipl); |
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221 | THREAD->debug_in_before_thread_runs = false; |
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222 | } |
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223 | |||
2805 | svoboda | 224 | void udebug_syscall_event(unative_t a1, unative_t a2, unative_t a3, |
2901 | svoboda | 225 | unative_t a4, unative_t a5, unative_t a6, unative_t id, unative_t rc, |
226 | bool end_variant) |
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2801 | svoboda | 227 | { |
2805 | svoboda | 228 | call_t *call; |
2823 | svoboda | 229 | ipl_t ipl; |
2901 | svoboda | 230 | udebug_event_t etype; |
2805 | svoboda | 231 | |
2901 | svoboda | 232 | etype = end_variant ? UDEBUG_EVENT_SYSCALL_E : UDEBUG_EVENT_SYSCALL_B; |
233 | |||
2823 | svoboda | 234 | ipl = interrupts_disable(); |
2848 | svoboda | 235 | spinlock_lock(&THREAD->debug_lock); |
2823 | svoboda | 236 | |
2854 | svoboda | 237 | /* Must only generate events when in debugging session and have go */ |
2867 | svoboda | 238 | if (THREAD->debug_active != true || |
2899 | svoboda | 239 | THREAD->debug_stop == true || |
3014 | svoboda | 240 | (TASK->udebug.evmask & UDEBUG_EVMASK(etype)) == 0) { |
2867 | svoboda | 241 | spinlock_unlock(&THREAD->debug_lock); |
242 | interrupts_restore(ipl); |
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243 | return; |
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244 | } |
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2804 | svoboda | 245 | |
2913 | svoboda | 246 | //klog_printf("udebug_syscall_event"); |
2867 | svoboda | 247 | call = THREAD->debug_go_call; |
248 | IPC_SET_RETVAL(call->data, 0); |
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2901 | svoboda | 249 | IPC_SET_ARG1(call->data, etype); |
2867 | svoboda | 250 | IPC_SET_ARG2(call->data, id); |
251 | IPC_SET_ARG3(call->data, rc); |
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2913 | svoboda | 252 | //klog_printf("udebug_syscall_event/ipc_answer"); |
2805 | svoboda | 253 | |
2867 | svoboda | 254 | THREAD->syscall_args[0] = a1; |
255 | THREAD->syscall_args[1] = a2; |
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256 | THREAD->syscall_args[2] = a3; |
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257 | THREAD->syscall_args[3] = a4; |
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258 | THREAD->syscall_args[4] = a5; |
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259 | THREAD->syscall_args[5] = a6; |
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2866 | svoboda | 260 | |
2867 | svoboda | 261 | /* |
262 | * Make sure debug_stop is true when going to sleep |
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263 | * in case we get woken up by DEBUG_END. (At which |
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264 | * point it must be back to the initial true value). |
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265 | */ |
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266 | THREAD->debug_stop = true; |
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2825 | svoboda | 267 | |
2901 | svoboda | 268 | THREAD->cur_event = etype; |
2867 | svoboda | 269 | spinlock_unlock(&THREAD->debug_lock); |
2834 | svoboda | 270 | |
2867 | svoboda | 271 | spinlock_lock(&TASK->lock); |
272 | ipc_answer(&TASK->answerbox, THREAD->debug_go_call); |
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273 | spinlock_unlock(&TASK->lock); |
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274 | interrupts_restore(ipl); |
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275 | |||
2917 | svoboda | 276 | udebug_wait_for_go(&THREAD->go_wq); |
2867 | svoboda | 277 | } |
278 | |||
2903 | svoboda | 279 | void udebug_thread_b_event(struct thread *t) |
2867 | svoboda | 280 | { |
281 | call_t *call; |
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282 | ipl_t ipl; |
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283 | |||
284 | ipl = interrupts_disable(); |
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285 | spinlock_lock(&THREAD->debug_lock); |
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286 | |||
2903 | svoboda | 287 | klog_printf("udebug_thread_b_event"); |
2867 | svoboda | 288 | klog_printf("- check state"); |
289 | |||
290 | /* Must only generate events when in debugging session */ |
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291 | if (THREAD->debug_active != true) { |
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292 | klog_printf("- debug_active: %s, debug_stop: %s", |
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293 | THREAD->debug_active ? "yes(+)" : "no(-)", |
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294 | THREAD->debug_stop ? "yes(-)" : "no(+)"); |
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2848 | svoboda | 295 | spinlock_unlock(&THREAD->debug_lock); |
2823 | svoboda | 296 | interrupts_restore(ipl); |
2867 | svoboda | 297 | return; |
2801 | svoboda | 298 | } |
2867 | svoboda | 299 | |
300 | klog_printf("- trigger event"); |
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301 | |||
302 | call = THREAD->debug_go_call; |
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303 | IPC_SET_RETVAL(call->data, 0); |
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2903 | svoboda | 304 | IPC_SET_ARG1(call->data, UDEBUG_EVENT_THREAD_B); |
2867 | svoboda | 305 | IPC_SET_ARG2(call->data, (unative_t)t); |
306 | |||
307 | /* |
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308 | * Make sure debug_stop is true when going to sleep |
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309 | * in case we get woken up by DEBUG_END. (At which |
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310 | * point it must be back to the initial true value). |
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311 | */ |
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312 | THREAD->debug_stop = true; |
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313 | |||
2903 | svoboda | 314 | THREAD->cur_event = UDEBUG_EVENT_THREAD_B; |
2867 | svoboda | 315 | spinlock_unlock(&THREAD->debug_lock); |
316 | |||
317 | spinlock_lock(&TASK->lock); |
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318 | ipc_answer(&TASK->answerbox, THREAD->debug_go_call); |
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319 | spinlock_unlock(&TASK->lock); |
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320 | |||
321 | interrupts_restore(ipl); |
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322 | klog_printf("- sleep"); |
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2917 | svoboda | 323 | udebug_wait_for_go(&THREAD->go_wq); |
2801 | svoboda | 324 | } |
325 | |||
2903 | svoboda | 326 | void udebug_thread_e_event(void) |
327 | { |
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328 | call_t *call; |
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329 | ipl_t ipl; |
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330 | |||
331 | ipl = interrupts_disable(); |
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332 | spinlock_lock(&THREAD->debug_lock); |
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333 | |||
334 | klog_printf("udebug_thread_e_event"); |
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335 | klog_printf("- check state"); |
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336 | |||
337 | /* Must only generate events when in debugging session */ |
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338 | if (THREAD->debug_active != true) { |
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339 | klog_printf("- debug_active: %s, debug_stop: %s", |
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340 | THREAD->debug_active ? "yes(+)" : "no(-)", |
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341 | THREAD->debug_stop ? "yes(-)" : "no(+)"); |
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342 | spinlock_unlock(&THREAD->debug_lock); |
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343 | interrupts_restore(ipl); |
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344 | return; |
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345 | } |
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346 | |||
347 | klog_printf("- trigger event"); |
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348 | |||
349 | call = THREAD->debug_go_call; |
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350 | IPC_SET_RETVAL(call->data, 0); |
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351 | IPC_SET_ARG1(call->data, UDEBUG_EVENT_THREAD_E); |
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352 | |||
2908 | svoboda | 353 | /* Prevent any further debug activity in thread */ |
354 | THREAD->debug_active = false; |
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355 | THREAD->cur_event = 0; /* none */ |
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356 | THREAD->debug_stop = true; /* set to initial value */ |
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2903 | svoboda | 357 | spinlock_unlock(&THREAD->debug_lock); |
358 | |||
359 | spinlock_lock(&TASK->lock); |
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360 | ipc_answer(&TASK->answerbox, THREAD->debug_go_call); |
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361 | spinlock_unlock(&TASK->lock); |
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362 | |||
363 | interrupts_restore(ipl); |
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364 | |||
2908 | svoboda | 365 | /* This event does not sleep - debugging has finished in this thread */ |
2903 | svoboda | 366 | } |
367 | |||
2921 | svoboda | 368 | static void breakpoint_trap_event(uintptr_t addr, udebug_event_t etype) |
2918 | svoboda | 369 | { |
370 | call_t *call; |
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371 | ipl_t ipl; |
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2903 | svoboda | 372 | |
2918 | svoboda | 373 | ipl = interrupts_disable(); |
374 | spinlock_lock(&THREAD->debug_lock); |
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375 | |||
376 | /* Must only generate events when in debugging session and have go */ |
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377 | if (THREAD->debug_active != true || |
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378 | THREAD->debug_stop == true || |
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3014 | svoboda | 379 | (TASK->udebug.evmask & UDEBUG_EVMASK(etype)) == 0) { |
2918 | svoboda | 380 | spinlock_unlock(&THREAD->debug_lock); |
381 | interrupts_restore(ipl); |
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382 | return; |
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383 | } |
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384 | |||
2921 | svoboda | 385 | klog_printf("udebug_breakpoint/trap_event"); |
2918 | svoboda | 386 | call = THREAD->debug_go_call; |
387 | IPC_SET_RETVAL(call->data, 0); |
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388 | IPC_SET_ARG1(call->data, etype); |
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389 | IPC_SET_ARG2(call->data, addr); |
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390 | |||
391 | /* |
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392 | * Make sure debug_stop is true when going to sleep |
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393 | * in case we get woken up by DEBUG_END. (At which |
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394 | * point it must be back to the initial true value). |
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395 | */ |
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396 | THREAD->debug_stop = true; |
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397 | |||
398 | THREAD->cur_event = etype; |
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399 | spinlock_unlock(&THREAD->debug_lock); |
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400 | klog_printf("- send answer"); |
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401 | |||
402 | spinlock_lock(&TASK->lock); |
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403 | ipc_answer(&TASK->answerbox, THREAD->debug_go_call); |
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404 | spinlock_unlock(&TASK->lock); |
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405 | interrupts_restore(ipl); |
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406 | |||
407 | udebug_wait_for_go(&THREAD->go_wq); |
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408 | } |
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409 | |||
2921 | svoboda | 410 | void udebug_breakpoint_event(uintptr_t addr) |
411 | { |
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412 | breakpoint_trap_event(addr, UDEBUG_EVENT_BREAKPOINT); |
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413 | } |
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2918 | svoboda | 414 | |
2921 | svoboda | 415 | void udebug_trap_event(uintptr_t addr) |
416 | { |
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417 | breakpoint_trap_event(addr, UDEBUG_EVENT_TRAP); |
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418 | } |
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419 | |||
2870 | svoboda | 420 | /** |
421 | * Terminate task debugging session. |
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422 | * |
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423 | * \param ta Must be already locked and interrupts must be disabled. |
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424 | * \return Zero on success or negative error code. |
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425 | */ |
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426 | int udebug_task_cleanup(struct task *ta) |
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427 | { |
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428 | thread_t *t; |
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429 | link_t *cur; |
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430 | int flags; |
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2867 | svoboda | 431 | |
2870 | svoboda | 432 | klog_printf("udebug_task_cleanup()"); |
433 | klog_printf("task %llu", ta->taskid); |
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434 | |||
3014 | svoboda | 435 | if (ta->udebug.dt_state == UDEBUG_TS_BEGINNING && |
436 | ta->udebug.dt_state != UDEBUG_TS_ACTIVE) { |
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2870 | svoboda | 437 | klog_printf("udebug_task_cleanup(): task not being debugged"); |
438 | return EINVAL; |
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439 | } |
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440 | |||
441 | /* Finish debugging of all userspace threads */ |
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442 | for (cur = ta->th_head.next; cur != &ta->th_head; cur = cur->next) { |
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443 | t = list_get_instance(cur, thread_t, th_link); |
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444 | |||
445 | spinlock_lock(&t->debug_lock); |
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446 | spinlock_lock(&t->lock); |
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447 | |||
448 | flags = t->flags; |
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449 | |||
450 | spinlock_unlock(&t->lock); |
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451 | |||
452 | /* Only process userspace threads */ |
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453 | if ((flags & THREAD_FLAG_USPACE) != 0) { |
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454 | /* Prevent any further debug activity in thread */ |
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455 | t->debug_active = false; |
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456 | t->cur_event = 0; /* none */ |
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457 | |||
458 | /* Still has go? */ |
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459 | if (t->debug_stop == false) { |
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460 | /* |
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461 | * Yes, so clear go. As debug_active == false, |
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462 | * this doesn't affect anything. |
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463 | */ |
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464 | t->debug_stop = true; |
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465 | |||
466 | /* Answer GO call */ |
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467 | klog_printf("answer GO call with EVENT_FINISHED"); |
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468 | IPC_SET_RETVAL(t->debug_go_call->data, 0); |
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469 | IPC_SET_ARG1(t->debug_go_call->data, UDEBUG_EVENT_FINISHED); |
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470 | ipc_answer(&ta->answerbox, t->debug_go_call); |
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471 | } else { |
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472 | /* |
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473 | * Debug_stop is already at initial value. |
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474 | * Yet this means the thread needs waking up. |
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475 | */ |
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476 | |||
477 | /* |
||
478 | * t's lock must not be held when calling |
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479 | * waitq_wakeup. |
||
480 | */ |
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481 | waitq_wakeup(&t->go_wq, WAKEUP_FIRST); |
||
482 | } |
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483 | } |
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484 | spinlock_unlock(&t->debug_lock); |
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485 | } |
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486 | |||
3014 | svoboda | 487 | ta->udebug.dt_state = UDEBUG_TS_INACTIVE; |
488 | ta->udebug.debugger = NULL; |
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2870 | svoboda | 489 | |
490 | return 0; |
||
491 | } |
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492 | |||
493 | |||
2801 | svoboda | 494 | /** @} |
495 | */ |