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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 | ||
12 | #include "qemu-common.h" | |
26bc60ac | 13 | #include "sysemu/replay.h" |
c92079f4 PD |
14 | #include "replay-internal.h" |
15 | #include "qemu/error-report.h" | |
16 | #include "sysemu/sysemu.h" | |
17 | ||
18 | unsigned int replay_data_kind = -1; | |
19 | static unsigned int replay_has_unread_data; | |
20 | ||
c16861ef PD |
21 | /* Mutex to protect reading and writing events to the log. |
22 | replay_data_kind and replay_has_unread_data are also protected | |
23 | by this mutex. | |
24 | It also protects replay events queue which stores events to be | |
25 | written or read to the log. */ | |
26 | static QemuMutex lock; | |
27 | ||
c92079f4 PD |
28 | /* File for replay writing */ |
29 | FILE *replay_file; | |
30 | ||
31 | void replay_put_byte(uint8_t byte) | |
32 | { | |
33 | if (replay_file) { | |
34 | putc(byte, replay_file); | |
35 | } | |
36 | } | |
37 | ||
38 | void replay_put_event(uint8_t event) | |
39 | { | |
26bc60ac | 40 | assert(event < EVENT_COUNT); |
c92079f4 PD |
41 | replay_put_byte(event); |
42 | } | |
43 | ||
44 | ||
45 | void replay_put_word(uint16_t word) | |
46 | { | |
47 | replay_put_byte(word >> 8); | |
48 | replay_put_byte(word); | |
49 | } | |
50 | ||
51 | void replay_put_dword(uint32_t dword) | |
52 | { | |
53 | replay_put_word(dword >> 16); | |
54 | replay_put_word(dword); | |
55 | } | |
56 | ||
57 | void replay_put_qword(int64_t qword) | |
58 | { | |
59 | replay_put_dword(qword >> 32); | |
60 | replay_put_dword(qword); | |
61 | } | |
62 | ||
63 | void replay_put_array(const uint8_t *buf, size_t size) | |
64 | { | |
65 | if (replay_file) { | |
66 | replay_put_dword(size); | |
67 | fwrite(buf, 1, size, replay_file); | |
68 | } | |
69 | } | |
70 | ||
71 | uint8_t replay_get_byte(void) | |
72 | { | |
73 | uint8_t byte = 0; | |
74 | if (replay_file) { | |
75 | byte = getc(replay_file); | |
76 | } | |
77 | return byte; | |
78 | } | |
79 | ||
80 | uint16_t replay_get_word(void) | |
81 | { | |
82 | uint16_t word = 0; | |
83 | if (replay_file) { | |
84 | word = replay_get_byte(); | |
85 | word = (word << 8) + replay_get_byte(); | |
86 | } | |
87 | ||
88 | return word; | |
89 | } | |
90 | ||
91 | uint32_t replay_get_dword(void) | |
92 | { | |
93 | uint32_t dword = 0; | |
94 | if (replay_file) { | |
95 | dword = replay_get_word(); | |
96 | dword = (dword << 16) + replay_get_word(); | |
97 | } | |
98 | ||
99 | return dword; | |
100 | } | |
101 | ||
102 | int64_t replay_get_qword(void) | |
103 | { | |
104 | int64_t qword = 0; | |
105 | if (replay_file) { | |
106 | qword = replay_get_dword(); | |
107 | qword = (qword << 32) + replay_get_dword(); | |
108 | } | |
109 | ||
110 | return qword; | |
111 | } | |
112 | ||
113 | void replay_get_array(uint8_t *buf, size_t *size) | |
114 | { | |
115 | if (replay_file) { | |
116 | *size = replay_get_dword(); | |
117 | if (fread(buf, 1, *size, replay_file) != *size) { | |
118 | error_report("replay read error"); | |
119 | } | |
120 | } | |
121 | } | |
122 | ||
123 | void replay_get_array_alloc(uint8_t **buf, size_t *size) | |
124 | { | |
125 | if (replay_file) { | |
126 | *size = replay_get_dword(); | |
127 | *buf = g_malloc(*size); | |
128 | if (fread(*buf, 1, *size, replay_file) != *size) { | |
129 | error_report("replay read error"); | |
130 | } | |
131 | } | |
132 | } | |
133 | ||
134 | void replay_check_error(void) | |
135 | { | |
136 | if (replay_file) { | |
137 | if (feof(replay_file)) { | |
138 | error_report("replay file is over"); | |
139 | qemu_system_vmstop_request_prepare(); | |
140 | qemu_system_vmstop_request(RUN_STATE_PAUSED); | |
141 | } else if (ferror(replay_file)) { | |
142 | error_report("replay file is over or something goes wrong"); | |
143 | qemu_system_vmstop_request_prepare(); | |
144 | qemu_system_vmstop_request(RUN_STATE_INTERNAL_ERROR); | |
145 | } | |
146 | } | |
147 | } | |
148 | ||
149 | void replay_fetch_data_kind(void) | |
150 | { | |
151 | if (replay_file) { | |
152 | if (!replay_has_unread_data) { | |
153 | replay_data_kind = replay_get_byte(); | |
26bc60ac PD |
154 | if (replay_data_kind == EVENT_INSTRUCTION) { |
155 | replay_state.instructions_count = replay_get_dword(); | |
156 | } | |
c92079f4 PD |
157 | replay_check_error(); |
158 | replay_has_unread_data = 1; | |
26bc60ac PD |
159 | if (replay_data_kind >= EVENT_COUNT) { |
160 | error_report("Replay: unknown event kind %d", replay_data_kind); | |
161 | exit(1); | |
162 | } | |
c92079f4 PD |
163 | } |
164 | } | |
165 | } | |
166 | ||
167 | void replay_finish_event(void) | |
168 | { | |
169 | replay_has_unread_data = 0; | |
170 | replay_fetch_data_kind(); | |
171 | } | |
c16861ef PD |
172 | |
173 | void replay_mutex_init(void) | |
174 | { | |
175 | qemu_mutex_init(&lock); | |
176 | } | |
177 | ||
178 | void replay_mutex_destroy(void) | |
179 | { | |
180 | qemu_mutex_destroy(&lock); | |
181 | } | |
182 | ||
183 | void replay_mutex_lock(void) | |
184 | { | |
185 | qemu_mutex_lock(&lock); | |
186 | } | |
187 | ||
188 | void replay_mutex_unlock(void) | |
189 | { | |
190 | qemu_mutex_unlock(&lock); | |
191 | } | |
26bc60ac PD |
192 | |
193 | /*! Saves cached instructions. */ | |
194 | void replay_save_instructions(void) | |
195 | { | |
196 | if (replay_file && replay_mode == REPLAY_MODE_RECORD) { | |
197 | replay_mutex_lock(); | |
198 | int diff = (int)(replay_get_current_step() - replay_state.current_step); | |
199 | if (diff > 0) { | |
200 | replay_put_event(EVENT_INSTRUCTION); | |
201 | replay_put_dword(diff); | |
202 | replay_state.current_step += diff; | |
203 | } | |
204 | replay_mutex_unlock(); | |
205 | } | |
206 | } |