1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/*
* replay-internal.c
*
* Copyright (c) 2010-2015 Institute for System Programming
* of the Russian Academy of Sciences.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "sysemu/replay.h"
#include "replay-internal.h"
#include "qemu/error-report.h"
#include "sysemu/sysemu.h"
/* Mutex to protect reading and writing events to the log.
data_kind and has_unread_data are also protected
by this mutex.
It also protects replay events queue which stores events to be
written or read to the log. */
static QemuMutex lock;
/* File for replay writing */
static bool write_error;
FILE *replay_file;
static void replay_write_error(void)
{
if (!write_error) {
error_report("replay write error");
write_error = true;
}
}
void replay_put_byte(uint8_t byte)
{
if (replay_file) {
if (putc(byte, replay_file) == EOF) {
replay_write_error();
}
}
}
void replay_put_event(uint8_t event)
{
assert(event < EVENT_COUNT);
replay_put_byte(event);
}
void replay_put_word(uint16_t word)
{
replay_put_byte(word >> 8);
replay_put_byte(word);
}
void replay_put_dword(uint32_t dword)
{
replay_put_word(dword >> 16);
replay_put_word(dword);
}
void replay_put_qword(int64_t qword)
{
replay_put_dword(qword >> 32);
replay_put_dword(qword);
}
void replay_put_array(const uint8_t *buf, size_t size)
{
if (replay_file) {
replay_put_dword(size);
if (fwrite(buf, 1, size, replay_file) != size) {
replay_write_error();
}
}
}
uint8_t replay_get_byte(void)
{
uint8_t byte = 0;
if (replay_file) {
byte = getc(replay_file);
}
return byte;
}
uint16_t replay_get_word(void)
{
uint16_t word = 0;
if (replay_file) {
word = replay_get_byte();
word = (word << 8) + replay_get_byte();
}
return word;
}
uint32_t replay_get_dword(void)
{
uint32_t dword = 0;
if (replay_file) {
dword = replay_get_word();
dword = (dword << 16) + replay_get_word();
}
return dword;
}
int64_t replay_get_qword(void)
{
int64_t qword = 0;
if (replay_file) {
qword = replay_get_dword();
qword = (qword << 32) + replay_get_dword();
}
return qword;
}
void replay_get_array(uint8_t *buf, size_t *size)
{
if (replay_file) {
*size = replay_get_dword();
if (fread(buf, 1, *size, replay_file) != *size) {
error_report("replay read error");
}
}
}
void replay_get_array_alloc(uint8_t **buf, size_t *size)
{
if (replay_file) {
*size = replay_get_dword();
*buf = g_malloc(*size);
if (fread(*buf, 1, *size, replay_file) != *size) {
error_report("replay read error");
}
}
}
void replay_check_error(void)
{
if (replay_file) {
if (feof(replay_file)) {
error_report("replay file is over");
qemu_system_vmstop_request_prepare();
qemu_system_vmstop_request(RUN_STATE_PAUSED);
} else if (ferror(replay_file)) {
error_report("replay file is over or something goes wrong");
qemu_system_vmstop_request_prepare();
qemu_system_vmstop_request(RUN_STATE_INTERNAL_ERROR);
}
}
}
void replay_fetch_data_kind(void)
{
if (replay_file) {
if (!replay_state.has_unread_data) {
replay_state.data_kind = replay_get_byte();
if (replay_state.data_kind == EVENT_INSTRUCTION) {
replay_state.instructions_count = replay_get_dword();
}
replay_check_error();
replay_state.has_unread_data = 1;
if (replay_state.data_kind >= EVENT_COUNT) {
error_report("Replay: unknown event kind %d",
replay_state.data_kind);
exit(1);
}
}
}
}
void replay_finish_event(void)
{
replay_state.has_unread_data = 0;
replay_fetch_data_kind();
}
static __thread bool replay_locked;
void replay_mutex_init(void)
{
qemu_mutex_init(&lock);
/* Hold the mutex while we start-up */
qemu_mutex_lock(&lock);
replay_locked = true;
}
bool replay_mutex_locked(void)
{
return replay_locked;
}
/* Ordering constraints, replay_lock must be taken before BQL */
void replay_mutex_lock(void)
{
if (replay_mode != REPLAY_MODE_NONE) {
g_assert(!qemu_mutex_iothread_locked());
g_assert(!replay_mutex_locked());
qemu_mutex_lock(&lock);
replay_locked = true;
}
}
void replay_mutex_unlock(void)
{
if (replay_mode != REPLAY_MODE_NONE) {
g_assert(replay_mutex_locked());
replay_locked = false;
qemu_mutex_unlock(&lock);
}
}
/*! Saves cached instructions. */
void replay_save_instructions(void)
{
if (replay_file && replay_mode == REPLAY_MODE_RECORD) {
g_assert(replay_mutex_locked());
int diff = (int)(replay_get_current_step() - replay_state.current_step);
/* Time can only go forward */
assert(diff >= 0);
if (diff > 0) {
replay_put_event(EVENT_INSTRUCTION);
replay_put_dword(diff);
replay_state.current_step += diff;
}
}
}
|
