]>
Commit | Line | Data |
---|---|---|
c92079f4 PD |
1 | /* |
2 | * replay-internal.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" |
26bc60ac | 13 | #include "sysemu/replay.h" |
54d31236 | 14 | #include "sysemu/runstate.h" |
c92079f4 PD |
15 | #include "replay-internal.h" |
16 | #include "qemu/error-report.h" | |
db725815 | 17 | #include "qemu/main-loop.h" |
c92079f4 | 18 | |
c16861ef | 19 | /* Mutex to protect reading and writing events to the log. |
f186d64d | 20 | data_kind and has_unread_data are also protected |
c16861ef PD |
21 | by this mutex. |
22 | It also protects replay events queue which stores events to be | |
23 | written or read to the log. */ | |
24 | static QemuMutex lock; | |
ddf63df7 PD |
25 | /* Condition and queue for fair ordering of mutex lock requests. */ |
26 | static QemuCond mutex_cond; | |
27 | static unsigned long mutex_head, mutex_tail; | |
c16861ef | 28 | |
c92079f4 | 29 | /* File for replay writing */ |
6dc0f529 | 30 | static bool write_error; |
c92079f4 PD |
31 | FILE *replay_file; |
32 | ||
6dc0f529 PD |
33 | static void replay_write_error(void) |
34 | { | |
35 | if (!write_error) { | |
36 | error_report("replay write error"); | |
37 | write_error = true; | |
38 | } | |
39 | } | |
40 | ||
0b570077 PM |
41 | static void replay_read_error(void) |
42 | { | |
43 | error_report("error reading the replay data"); | |
44 | exit(1); | |
45 | } | |
46 | ||
c92079f4 PD |
47 | void replay_put_byte(uint8_t byte) |
48 | { | |
49 | if (replay_file) { | |
6dc0f529 PD |
50 | if (putc(byte, replay_file) == EOF) { |
51 | replay_write_error(); | |
52 | } | |
c92079f4 PD |
53 | } |
54 | } | |
55 | ||
56 | void replay_put_event(uint8_t event) | |
57 | { | |
26bc60ac | 58 | assert(event < EVENT_COUNT); |
c92079f4 PD |
59 | replay_put_byte(event); |
60 | } | |
61 | ||
62 | ||
63 | void replay_put_word(uint16_t word) | |
64 | { | |
65 | replay_put_byte(word >> 8); | |
66 | replay_put_byte(word); | |
67 | } | |
68 | ||
69 | void replay_put_dword(uint32_t dword) | |
70 | { | |
71 | replay_put_word(dword >> 16); | |
72 | replay_put_word(dword); | |
73 | } | |
74 | ||
75 | void replay_put_qword(int64_t qword) | |
76 | { | |
77 | replay_put_dword(qword >> 32); | |
78 | replay_put_dword(qword); | |
79 | } | |
80 | ||
81 | void replay_put_array(const uint8_t *buf, size_t size) | |
82 | { | |
83 | if (replay_file) { | |
84 | replay_put_dword(size); | |
6dc0f529 PD |
85 | if (fwrite(buf, 1, size, replay_file) != size) { |
86 | replay_write_error(); | |
87 | } | |
c92079f4 PD |
88 | } |
89 | } | |
90 | ||
91 | uint8_t replay_get_byte(void) | |
92 | { | |
93 | uint8_t byte = 0; | |
94 | if (replay_file) { | |
0b570077 PM |
95 | int r = getc(replay_file); |
96 | if (r == EOF) { | |
97 | replay_read_error(); | |
98 | } | |
99 | byte = r; | |
c92079f4 PD |
100 | } |
101 | return byte; | |
102 | } | |
103 | ||
104 | uint16_t replay_get_word(void) | |
105 | { | |
106 | uint16_t word = 0; | |
107 | if (replay_file) { | |
108 | word = replay_get_byte(); | |
109 | word = (word << 8) + replay_get_byte(); | |
110 | } | |
111 | ||
112 | return word; | |
113 | } | |
114 | ||
115 | uint32_t replay_get_dword(void) | |
116 | { | |
117 | uint32_t dword = 0; | |
118 | if (replay_file) { | |
119 | dword = replay_get_word(); | |
120 | dword = (dword << 16) + replay_get_word(); | |
121 | } | |
122 | ||
123 | return dword; | |
124 | } | |
125 | ||
126 | int64_t replay_get_qword(void) | |
127 | { | |
128 | int64_t qword = 0; | |
129 | if (replay_file) { | |
130 | qword = replay_get_dword(); | |
131 | qword = (qword << 32) + replay_get_dword(); | |
132 | } | |
133 | ||
134 | return qword; | |
135 | } | |
136 | ||
137 | void replay_get_array(uint8_t *buf, size_t *size) | |
138 | { | |
139 | if (replay_file) { | |
140 | *size = replay_get_dword(); | |
141 | if (fread(buf, 1, *size, replay_file) != *size) { | |
0b570077 | 142 | replay_read_error(); |
c92079f4 PD |
143 | } |
144 | } | |
145 | } | |
146 | ||
147 | void replay_get_array_alloc(uint8_t **buf, size_t *size) | |
148 | { | |
149 | if (replay_file) { | |
150 | *size = replay_get_dword(); | |
151 | *buf = g_malloc(*size); | |
152 | if (fread(*buf, 1, *size, replay_file) != *size) { | |
0b570077 | 153 | replay_read_error(); |
c92079f4 PD |
154 | } |
155 | } | |
156 | } | |
157 | ||
158 | void replay_check_error(void) | |
159 | { | |
160 | if (replay_file) { | |
161 | if (feof(replay_file)) { | |
162 | error_report("replay file is over"); | |
163 | qemu_system_vmstop_request_prepare(); | |
164 | qemu_system_vmstop_request(RUN_STATE_PAUSED); | |
165 | } else if (ferror(replay_file)) { | |
166 | error_report("replay file is over or something goes wrong"); | |
167 | qemu_system_vmstop_request_prepare(); | |
168 | qemu_system_vmstop_request(RUN_STATE_INTERNAL_ERROR); | |
169 | } | |
170 | } | |
171 | } | |
172 | ||
173 | void replay_fetch_data_kind(void) | |
174 | { | |
175 | if (replay_file) { | |
f186d64d PD |
176 | if (!replay_state.has_unread_data) { |
177 | replay_state.data_kind = replay_get_byte(); | |
dcda7321 | 178 | replay_state.current_event++; |
f186d64d | 179 | if (replay_state.data_kind == EVENT_INSTRUCTION) { |
13f26713 | 180 | replay_state.instruction_count = replay_get_dword(); |
26bc60ac | 181 | } |
c92079f4 | 182 | replay_check_error(); |
2b7a58b6 | 183 | replay_state.has_unread_data = true; |
f186d64d PD |
184 | if (replay_state.data_kind >= EVENT_COUNT) { |
185 | error_report("Replay: unknown event kind %d", | |
186 | replay_state.data_kind); | |
26bc60ac PD |
187 | exit(1); |
188 | } | |
c92079f4 PD |
189 | } |
190 | } | |
191 | } | |
192 | ||
193 | void replay_finish_event(void) | |
194 | { | |
2b7a58b6 | 195 | replay_state.has_unread_data = false; |
c92079f4 PD |
196 | replay_fetch_data_kind(); |
197 | } | |
c16861ef | 198 | |
180d30be AB |
199 | static __thread bool replay_locked; |
200 | ||
c16861ef PD |
201 | void replay_mutex_init(void) |
202 | { | |
203 | qemu_mutex_init(&lock); | |
ddf63df7 | 204 | qemu_cond_init(&mutex_cond); |
d759c951 | 205 | /* Hold the mutex while we start-up */ |
d759c951 | 206 | replay_locked = true; |
ddf63df7 | 207 | ++mutex_tail; |
c16861ef PD |
208 | } |
209 | ||
a36544d3 | 210 | bool replay_mutex_locked(void) |
180d30be AB |
211 | { |
212 | return replay_locked; | |
213 | } | |
214 | ||
d759c951 | 215 | /* Ordering constraints, replay_lock must be taken before BQL */ |
c16861ef PD |
216 | void replay_mutex_lock(void) |
217 | { | |
d759c951 | 218 | if (replay_mode != REPLAY_MODE_NONE) { |
ddf63df7 | 219 | unsigned long id; |
195801d7 | 220 | g_assert(!bql_locked()); |
d759c951 AB |
221 | g_assert(!replay_mutex_locked()); |
222 | qemu_mutex_lock(&lock); | |
ddf63df7 PD |
223 | id = mutex_tail++; |
224 | while (id != mutex_head) { | |
225 | qemu_cond_wait(&mutex_cond, &lock); | |
226 | } | |
d759c951 | 227 | replay_locked = true; |
ddf63df7 | 228 | qemu_mutex_unlock(&lock); |
d759c951 | 229 | } |
c16861ef PD |
230 | } |
231 | ||
232 | void replay_mutex_unlock(void) | |
233 | { | |
d759c951 AB |
234 | if (replay_mode != REPLAY_MODE_NONE) { |
235 | g_assert(replay_mutex_locked()); | |
ddf63df7 PD |
236 | qemu_mutex_lock(&lock); |
237 | ++mutex_head; | |
d759c951 | 238 | replay_locked = false; |
ddf63df7 | 239 | qemu_cond_broadcast(&mutex_cond); |
d759c951 AB |
240 | qemu_mutex_unlock(&lock); |
241 | } | |
c16861ef | 242 | } |
26bc60ac | 243 | |
13f26713 | 244 | void replay_advance_current_icount(uint64_t current_icount) |
74c0b816 | 245 | { |
13f26713 | 246 | int diff = (int)(current_icount - replay_state.current_icount); |
74c0b816 PB |
247 | |
248 | /* Time can only go forward */ | |
249 | assert(diff >= 0); | |
250 | ||
366a85e4 PD |
251 | if (replay_mode == REPLAY_MODE_RECORD) { |
252 | if (diff > 0) { | |
253 | replay_put_event(EVENT_INSTRUCTION); | |
254 | replay_put_dword(diff); | |
255 | replay_state.current_icount += diff; | |
256 | } | |
257 | } else if (replay_mode == REPLAY_MODE_PLAY) { | |
258 | if (diff > 0) { | |
259 | replay_state.instruction_count -= diff; | |
260 | replay_state.current_icount += diff; | |
261 | if (replay_state.instruction_count == 0) { | |
262 | assert(replay_state.data_kind == EVENT_INSTRUCTION); | |
263 | replay_finish_event(); | |
264 | /* Wake up iothread. This is required because | |
265 | timers will not expire until clock counters | |
266 | will be read from the log. */ | |
267 | qemu_notify_event(); | |
268 | } | |
269 | } | |
270 | /* Execution reached the break step */ | |
271 | if (replay_break_icount == replay_state.current_icount) { | |
272 | /* Cannot make callback directly from the vCPU thread */ | |
273 | timer_mod_ns(replay_break_timer, | |
274 | qemu_clock_get_ns(QEMU_CLOCK_REALTIME)); | |
275 | } | |
74c0b816 PB |
276 | } |
277 | } | |
278 | ||
26bc60ac PD |
279 | /*! Saves cached instructions. */ |
280 | void replay_save_instructions(void) | |
281 | { | |
282 | if (replay_file && replay_mode == REPLAY_MODE_RECORD) { | |
d759c951 | 283 | g_assert(replay_mutex_locked()); |
13f26713 | 284 | replay_advance_current_icount(replay_get_current_icount()); |
26bc60ac PD |
285 | } |
286 | } |