aboutsummaryrefslogtreecommitdiff
path: root/replay/replay.c
blob: b4fc64aceeeb275cfac1ada4d49b3547c54c5a7c (plain)
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
/*
 * replay.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-common.h"
#include "sysemu/replay.h"
#include "replay-internal.h"
#include "qemu/timer.h"
#include "qemu/main-loop.h"

ReplayMode replay_mode = REPLAY_MODE_NONE;

ReplayState replay_state;

bool replay_next_event_is(int event)
{
    bool res = false;

    /* nothing to skip - not all instructions used */
    if (replay_state.instructions_count != 0) {
        assert(replay_data_kind == EVENT_INSTRUCTION);
        return event == EVENT_INSTRUCTION;
    }

    while (true) {
        if (event == replay_data_kind) {
            res = true;
        }
        switch (replay_data_kind) {
        default:
            /* clock, time_t, checkpoint and other events */
            return res;
        }
    }
    return res;
}

uint64_t replay_get_current_step(void)
{
    return cpu_get_icount_raw();
}

int replay_get_instructions(void)
{
    int res = 0;
    replay_mutex_lock();
    if (replay_next_event_is(EVENT_INSTRUCTION)) {
        res = replay_state.instructions_count;
    }
    replay_mutex_unlock();
    return res;
}

void replay_account_executed_instructions(void)
{
    if (replay_mode == REPLAY_MODE_PLAY) {
        replay_mutex_lock();
        if (replay_state.instructions_count > 0) {
            int count = (int)(replay_get_current_step()
                              - replay_state.current_step);
            replay_state.instructions_count -= count;
            replay_state.current_step += count;
            if (replay_state.instructions_count == 0) {
                assert(replay_data_kind == EVENT_INSTRUCTION);
                replay_finish_event();
                /* Wake up iothread. This is required because
                   timers will not expire until clock counters
                   will be read from the log. */
                qemu_notify_event();
            }
        }
        replay_mutex_unlock();
    }
}

bool replay_exception(void)
{
    if (replay_mode == REPLAY_MODE_RECORD) {
        replay_save_instructions();
        replay_mutex_lock();
        replay_put_event(EVENT_EXCEPTION);
        replay_mutex_unlock();
        return true;
    } else if (replay_mode == REPLAY_MODE_PLAY) {
        bool res = replay_has_exception();
        if (res) {
            replay_mutex_lock();
            replay_finish_event();
            replay_mutex_unlock();
        }
        return res;
    }

    return true;
}

bool replay_has_exception(void)
{
    bool res = false;
    if (replay_mode == REPLAY_MODE_PLAY) {
        replay_account_executed_instructions();
        replay_mutex_lock();
        res = replay_next_event_is(EVENT_EXCEPTION);
        replay_mutex_unlock();
    }

    return res;
}

bool replay_interrupt(void)
{
    if (replay_mode == REPLAY_MODE_RECORD) {
        replay_save_instructions();
        replay_mutex_lock();
        replay_put_event(EVENT_INTERRUPT);
        replay_mutex_unlock();
        return true;
    } else if (replay_mode == REPLAY_MODE_PLAY) {
        bool res = replay_has_interrupt();
        if (res) {
            replay_mutex_lock();
            replay_finish_event();
            replay_mutex_unlock();
        }
        return res;
    }

    return true;
}

bool replay_has_interrupt(void)
{
    bool res = false;
    if (replay_mode == REPLAY_MODE_PLAY) {
        replay_account_executed_instructions();
        replay_mutex_lock();
        res = replay_next_event_is(EVENT_INTERRUPT);
        replay_mutex_unlock();
    }
    return res;
}