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/*
* 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"
#include "sysemu/sysemu.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) {
case EVENT_SHUTDOWN:
replay_finish_event();
qemu_system_shutdown_request();
break;
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;
}
void replay_shutdown_request(void)
{
if (replay_mode == REPLAY_MODE_RECORD) {
replay_mutex_lock();
replay_put_event(EVENT_SHUTDOWN);
replay_mutex_unlock();
}
}
bool replay_checkpoint(ReplayCheckpoint checkpoint)
{
bool res = false;
assert(EVENT_CHECKPOINT + checkpoint <= EVENT_CHECKPOINT_LAST);
replay_save_instructions();
if (!replay_file) {
return true;
}
replay_mutex_lock();
if (replay_mode == REPLAY_MODE_PLAY) {
if (replay_next_event_is(EVENT_CHECKPOINT + checkpoint)) {
replay_finish_event();
} else if (replay_data_kind != EVENT_ASYNC) {
res = false;
goto out;
}
replay_read_events(checkpoint);
/* replay_read_events may leave some unread events.
Return false if not all of the events associated with
checkpoint were processed */
res = replay_data_kind != EVENT_ASYNC;
} else if (replay_mode == REPLAY_MODE_RECORD) {
replay_put_event(EVENT_CHECKPOINT + checkpoint);
replay_save_events(checkpoint);
res = true;
}
out:
replay_mutex_unlock();
return res;
}
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