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Commit | Line | Data |
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d73abd6d PD |
1 | /* |
2 | * replay.c | |
3 | * | |
4 | * Copyright (c) 2010-2015 Institute for System Programming | |
5 | * of the Russian Academy of Sciences. | |
6 | * | |
7 | * This work is licensed under the terms of the GNU GPL, version 2 or later. | |
8 | * See the COPYING file in the top-level directory. | |
9 | * | |
10 | */ | |
11 | ||
d38ea87a | 12 | #include "qemu/osdep.h" |
da34e65c | 13 | #include "qapi/error.h" |
740b1759 | 14 | #include "sysemu/cpu-timers.h" |
d73abd6d | 15 | #include "sysemu/replay.h" |
54d31236 | 16 | #include "sysemu/runstate.h" |
26bc60ac | 17 | #include "replay-internal.h" |
8b427044 | 18 | #include "qemu/main-loop.h" |
922a01a0 | 19 | #include "qemu/option.h" |
d2528bdc | 20 | #include "sysemu/cpus.h" |
7615936e PD |
21 | #include "qemu/error-report.h" |
22 | ||
23 | /* Current version of the replay mechanism. | |
24 | Increase it when file format changes. */ | |
677a3bab | 25 | #define REPLAY_VERSION 0xe0200a |
7615936e PD |
26 | /* Size of replay log header */ |
27 | #define HEADER_SIZE (sizeof(uint32_t) + sizeof(uint64_t)) | |
d73abd6d PD |
28 | |
29 | ReplayMode replay_mode = REPLAY_MODE_NONE; | |
9c2037d0 | 30 | char *replay_snapshot; |
26bc60ac | 31 | |
7615936e PD |
32 | /* Name of replay file */ |
33 | static char *replay_filename; | |
26bc60ac | 34 | ReplayState replay_state; |
0194749a | 35 | static GSList *replay_blockers; |
26bc60ac | 36 | |
e7510671 PD |
37 | /* Replay breakpoints */ |
38 | uint64_t replay_break_icount = -1ULL; | |
39 | QEMUTimer *replay_break_timer; | |
40 | ||
26bc60ac PD |
41 | bool replay_next_event_is(int event) |
42 | { | |
43 | bool res = false; | |
44 | ||
45 | /* nothing to skip - not all instructions used */ | |
13f26713 | 46 | if (replay_state.instruction_count != 0) { |
f186d64d | 47 | assert(replay_state.data_kind == EVENT_INSTRUCTION); |
26bc60ac PD |
48 | return event == EVENT_INSTRUCTION; |
49 | } | |
50 | ||
51 | while (true) { | |
e957ad8a PD |
52 | unsigned int data_kind = replay_state.data_kind; |
53 | if (event == data_kind) { | |
26bc60ac PD |
54 | res = true; |
55 | } | |
e957ad8a | 56 | switch (data_kind) { |
802f045a | 57 | case EVENT_SHUTDOWN ... EVENT_SHUTDOWN_LAST: |
b60c48a7 | 58 | replay_finish_event(); |
e957ad8a | 59 | qemu_system_shutdown_request(data_kind - EVENT_SHUTDOWN); |
b60c48a7 | 60 | break; |
26bc60ac PD |
61 | default: |
62 | /* clock, time_t, checkpoint and other events */ | |
63 | return res; | |
64 | } | |
65 | } | |
66 | return res; | |
67 | } | |
68 | ||
13f26713 | 69 | uint64_t replay_get_current_icount(void) |
26bc60ac | 70 | { |
8191d368 | 71 | return icount_get_raw(); |
26bc60ac | 72 | } |
8b427044 PD |
73 | |
74 | int replay_get_instructions(void) | |
75 | { | |
76 | int res = 0; | |
77 | replay_mutex_lock(); | |
78 | if (replay_next_event_is(EVENT_INSTRUCTION)) { | |
13f26713 | 79 | res = replay_state.instruction_count; |
e7510671 PD |
80 | if (replay_break_icount != -1LL) { |
81 | uint64_t current = replay_get_current_icount(); | |
82 | assert(replay_break_icount >= current); | |
83 | if (current + res > replay_break_icount) { | |
84 | res = replay_break_icount - current; | |
85 | } | |
86 | } | |
8b427044 PD |
87 | } |
88 | replay_mutex_unlock(); | |
89 | return res; | |
90 | } | |
91 | ||
92 | void replay_account_executed_instructions(void) | |
93 | { | |
94 | if (replay_mode == REPLAY_MODE_PLAY) { | |
d759c951 | 95 | g_assert(replay_mutex_locked()); |
13f26713 | 96 | if (replay_state.instruction_count > 0) { |
366a85e4 | 97 | replay_advance_current_icount(replay_get_current_icount()); |
8b427044 | 98 | } |
8b427044 PD |
99 | } |
100 | } | |
6f060969 PD |
101 | |
102 | bool replay_exception(void) | |
103 | { | |
d759c951 | 104 | |
6f060969 | 105 | if (replay_mode == REPLAY_MODE_RECORD) { |
d759c951 | 106 | g_assert(replay_mutex_locked()); |
6f060969 | 107 | replay_save_instructions(); |
6f060969 | 108 | replay_put_event(EVENT_EXCEPTION); |
6f060969 PD |
109 | return true; |
110 | } else if (replay_mode == REPLAY_MODE_PLAY) { | |
d759c951 | 111 | g_assert(replay_mutex_locked()); |
6f060969 PD |
112 | bool res = replay_has_exception(); |
113 | if (res) { | |
6f060969 | 114 | replay_finish_event(); |
6f060969 PD |
115 | } |
116 | return res; | |
117 | } | |
118 | ||
119 | return true; | |
120 | } | |
121 | ||
122 | bool replay_has_exception(void) | |
123 | { | |
124 | bool res = false; | |
125 | if (replay_mode == REPLAY_MODE_PLAY) { | |
d759c951 | 126 | g_assert(replay_mutex_locked()); |
6f060969 | 127 | replay_account_executed_instructions(); |
6f060969 | 128 | res = replay_next_event_is(EVENT_EXCEPTION); |
6f060969 PD |
129 | } |
130 | ||
131 | return res; | |
132 | } | |
133 | ||
134 | bool replay_interrupt(void) | |
135 | { | |
136 | if (replay_mode == REPLAY_MODE_RECORD) { | |
d759c951 | 137 | g_assert(replay_mutex_locked()); |
6f060969 | 138 | replay_save_instructions(); |
6f060969 | 139 | replay_put_event(EVENT_INTERRUPT); |
6f060969 PD |
140 | return true; |
141 | } else if (replay_mode == REPLAY_MODE_PLAY) { | |
d759c951 | 142 | g_assert(replay_mutex_locked()); |
6f060969 PD |
143 | bool res = replay_has_interrupt(); |
144 | if (res) { | |
6f060969 | 145 | replay_finish_event(); |
6f060969 PD |
146 | } |
147 | return res; | |
148 | } | |
149 | ||
150 | return true; | |
151 | } | |
152 | ||
153 | bool replay_has_interrupt(void) | |
154 | { | |
155 | bool res = false; | |
156 | if (replay_mode == REPLAY_MODE_PLAY) { | |
d759c951 | 157 | g_assert(replay_mutex_locked()); |
6f060969 | 158 | replay_account_executed_instructions(); |
6f060969 | 159 | res = replay_next_event_is(EVENT_INTERRUPT); |
6f060969 PD |
160 | } |
161 | return res; | |
162 | } | |
b60c48a7 | 163 | |
802f045a | 164 | void replay_shutdown_request(ShutdownCause cause) |
b60c48a7 PD |
165 | { |
166 | if (replay_mode == REPLAY_MODE_RECORD) { | |
d759c951 | 167 | g_assert(replay_mutex_locked()); |
802f045a | 168 | replay_put_event(EVENT_SHUTDOWN + cause); |
b60c48a7 PD |
169 | } |
170 | } | |
8bd7f71d PD |
171 | |
172 | bool replay_checkpoint(ReplayCheckpoint checkpoint) | |
173 | { | |
174 | bool res = false; | |
66eb7825 | 175 | static bool in_checkpoint; |
8bd7f71d | 176 | assert(EVENT_CHECKPOINT + checkpoint <= EVENT_CHECKPOINT_LAST); |
8bd7f71d PD |
177 | |
178 | if (!replay_file) { | |
179 | return true; | |
180 | } | |
181 | ||
66eb7825 PD |
182 | if (in_checkpoint) { |
183 | /* If we are already in checkpoint, then there is no need | |
184 | for additional synchronization. | |
185 | Recursion occurs when HW event modifies timers. | |
186 | Timer modification may invoke the checkpoint and | |
187 | proceed to recursion. */ | |
188 | return true; | |
189 | } | |
190 | in_checkpoint = true; | |
191 | ||
192 | replay_save_instructions(); | |
8bd7f71d PD |
193 | |
194 | if (replay_mode == REPLAY_MODE_PLAY) { | |
d759c951 | 195 | g_assert(replay_mutex_locked()); |
8bd7f71d PD |
196 | if (replay_next_event_is(EVENT_CHECKPOINT + checkpoint)) { |
197 | replay_finish_event(); | |
f186d64d | 198 | } else if (replay_state.data_kind != EVENT_ASYNC) { |
8bd7f71d PD |
199 | res = false; |
200 | goto out; | |
201 | } | |
202 | replay_read_events(checkpoint); | |
203 | /* replay_read_events may leave some unread events. | |
204 | Return false if not all of the events associated with | |
205 | checkpoint were processed */ | |
f186d64d | 206 | res = replay_state.data_kind != EVENT_ASYNC; |
8bd7f71d | 207 | } else if (replay_mode == REPLAY_MODE_RECORD) { |
d759c951 | 208 | g_assert(replay_mutex_locked()); |
8bd7f71d | 209 | replay_put_event(EVENT_CHECKPOINT + checkpoint); |
89e46eb4 PD |
210 | /* This checkpoint belongs to several threads. |
211 | Processing events from different threads is | |
212 | non-deterministic */ | |
ca9759c2 PD |
213 | if (checkpoint != CHECKPOINT_CLOCK_WARP_START |
214 | /* FIXME: this is temporary fix, other checkpoints | |
215 | may also be invoked from the different threads someday. | |
216 | Asynchronous event processing should be refactored | |
217 | to create additional replay event kind which is | |
218 | nailed to the one of the threads and which processes | |
219 | the event queue. */ | |
220 | && checkpoint != CHECKPOINT_CLOCK_VIRTUAL) { | |
89e46eb4 PD |
221 | replay_save_events(checkpoint); |
222 | } | |
8bd7f71d PD |
223 | res = true; |
224 | } | |
225 | out: | |
66eb7825 | 226 | in_checkpoint = false; |
8bd7f71d PD |
227 | return res; |
228 | } | |
7615936e | 229 | |
0c08185f PD |
230 | bool replay_has_checkpoint(void) |
231 | { | |
232 | bool res = false; | |
233 | if (replay_mode == REPLAY_MODE_PLAY) { | |
234 | g_assert(replay_mutex_locked()); | |
235 | replay_account_executed_instructions(); | |
236 | res = EVENT_CHECKPOINT <= replay_state.data_kind | |
237 | && replay_state.data_kind <= EVENT_CHECKPOINT_LAST; | |
238 | } | |
239 | return res; | |
240 | } | |
241 | ||
7615936e PD |
242 | static void replay_enable(const char *fname, int mode) |
243 | { | |
244 | const char *fmode = NULL; | |
245 | assert(!replay_file); | |
246 | ||
247 | switch (mode) { | |
248 | case REPLAY_MODE_RECORD: | |
249 | fmode = "wb"; | |
250 | break; | |
251 | case REPLAY_MODE_PLAY: | |
252 | fmode = "rb"; | |
253 | break; | |
254 | default: | |
255 | fprintf(stderr, "Replay: internal error: invalid replay mode\n"); | |
256 | exit(1); | |
257 | } | |
258 | ||
259 | atexit(replay_finish); | |
260 | ||
7615936e PD |
261 | replay_file = fopen(fname, fmode); |
262 | if (replay_file == NULL) { | |
263 | fprintf(stderr, "Replay: open %s: %s\n", fname, strerror(errno)); | |
264 | exit(1); | |
265 | } | |
266 | ||
267 | replay_filename = g_strdup(fname); | |
7615936e | 268 | replay_mode = mode; |
d759c951 AB |
269 | replay_mutex_init(); |
270 | ||
f186d64d | 271 | replay_state.data_kind = -1; |
13f26713 PD |
272 | replay_state.instruction_count = 0; |
273 | replay_state.current_icount = 0; | |
f186d64d | 274 | replay_state.has_unread_data = 0; |
7615936e PD |
275 | |
276 | /* skip file header for RECORD and check it for PLAY */ | |
277 | if (replay_mode == REPLAY_MODE_RECORD) { | |
278 | fseek(replay_file, HEADER_SIZE, SEEK_SET); | |
279 | } else if (replay_mode == REPLAY_MODE_PLAY) { | |
280 | unsigned int version = replay_get_dword(); | |
281 | if (version != REPLAY_VERSION) { | |
282 | fprintf(stderr, "Replay: invalid input log file version\n"); | |
283 | exit(1); | |
284 | } | |
285 | /* go to the beginning */ | |
286 | fseek(replay_file, HEADER_SIZE, SEEK_SET); | |
287 | replay_fetch_data_kind(); | |
288 | } | |
289 | ||
290 | replay_init_events(); | |
291 | } | |
292 | ||
293 | void replay_configure(QemuOpts *opts) | |
294 | { | |
295 | const char *fname; | |
296 | const char *rr; | |
297 | ReplayMode mode = REPLAY_MODE_NONE; | |
890ad550 EH |
298 | Location loc; |
299 | ||
300 | if (!opts) { | |
301 | return; | |
302 | } | |
303 | ||
304 | loc_push_none(&loc); | |
305 | qemu_opts_loc_restore(opts); | |
7615936e PD |
306 | |
307 | rr = qemu_opt_get(opts, "rr"); | |
308 | if (!rr) { | |
309 | /* Just enabling icount */ | |
d9d3aaea | 310 | goto out; |
7615936e PD |
311 | } else if (!strcmp(rr, "record")) { |
312 | mode = REPLAY_MODE_RECORD; | |
313 | } else if (!strcmp(rr, "replay")) { | |
314 | mode = REPLAY_MODE_PLAY; | |
315 | } else { | |
316 | error_report("Invalid icount rr option: %s", rr); | |
317 | exit(1); | |
318 | } | |
319 | ||
320 | fname = qemu_opt_get(opts, "rrfile"); | |
321 | if (!fname) { | |
322 | error_report("File name not specified for replay"); | |
323 | exit(1); | |
324 | } | |
325 | ||
9c2037d0 | 326 | replay_snapshot = g_strdup(qemu_opt_get(opts, "rrsnapshot")); |
306e196f | 327 | replay_vmstate_register(); |
7615936e | 328 | replay_enable(fname, mode); |
890ad550 | 329 | |
d9d3aaea | 330 | out: |
890ad550 | 331 | loc_pop(&loc); |
7615936e PD |
332 | } |
333 | ||
334 | void replay_start(void) | |
335 | { | |
336 | if (replay_mode == REPLAY_MODE_NONE) { | |
337 | return; | |
338 | } | |
339 | ||
0194749a | 340 | if (replay_blockers) { |
c29b77f9 | 341 | error_reportf_err(replay_blockers->data, "Record/replay: "); |
0194749a PD |
342 | exit(1); |
343 | } | |
740b1759 | 344 | if (!icount_enabled()) { |
4c27b859 PD |
345 | error_report("Please enable icount to use record/replay"); |
346 | exit(1); | |
347 | } | |
0194749a | 348 | |
7615936e PD |
349 | /* Timer for snapshotting will be set up here. */ |
350 | ||
351 | replay_enable_events(); | |
352 | } | |
353 | ||
354 | void replay_finish(void) | |
355 | { | |
356 | if (replay_mode == REPLAY_MODE_NONE) { | |
357 | return; | |
358 | } | |
359 | ||
360 | replay_save_instructions(); | |
361 | ||
362 | /* finalize the file */ | |
363 | if (replay_file) { | |
364 | if (replay_mode == REPLAY_MODE_RECORD) { | |
ed5d7ff3 PD |
365 | /* |
366 | * Can't do it in the signal handler, therefore | |
367 | * add shutdown event here for the case of Ctrl-C. | |
368 | */ | |
369 | replay_shutdown_request(SHUTDOWN_CAUSE_HOST_SIGNAL); | |
7615936e PD |
370 | /* write end event */ |
371 | replay_put_event(EVENT_END); | |
372 | ||
373 | /* write header */ | |
374 | fseek(replay_file, 0, SEEK_SET); | |
375 | replay_put_dword(REPLAY_VERSION); | |
376 | } | |
377 | ||
378 | fclose(replay_file); | |
379 | replay_file = NULL; | |
380 | } | |
381 | if (replay_filename) { | |
382 | g_free(replay_filename); | |
383 | replay_filename = NULL; | |
384 | } | |
385 | ||
9c2037d0 PD |
386 | g_free(replay_snapshot); |
387 | replay_snapshot = NULL; | |
388 | ||
ae25dccb PD |
389 | replay_mode = REPLAY_MODE_NONE; |
390 | ||
7615936e | 391 | replay_finish_events(); |
7615936e | 392 | } |
0194749a PD |
393 | |
394 | void replay_add_blocker(Error *reason) | |
395 | { | |
396 | replay_blockers = g_slist_prepend(replay_blockers, reason); | |
397 | } | |
56db1198 PD |
398 | |
399 | const char *replay_get_filename(void) | |
400 | { | |
401 | return replay_filename; | |
402 | } |