343 lines
8.4 KiB
C
343 lines
8.4 KiB
C
/*
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* replay.c
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*
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* Copyright (c) 2010-2015 Institute for System Programming
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* of the Russian Academy of Sciences.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu-common.h"
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#include "sysemu/replay.h"
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#include "replay-internal.h"
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#include "qemu/timer.h"
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#include "qemu/main-loop.h"
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#include "sysemu/sysemu.h"
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#include "qemu/error-report.h"
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/* Current version of the replay mechanism.
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Increase it when file format changes. */
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#define REPLAY_VERSION 0xe02002
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/* Size of replay log header */
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#define HEADER_SIZE (sizeof(uint32_t) + sizeof(uint64_t))
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ReplayMode replay_mode = REPLAY_MODE_NONE;
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/* Name of replay file */
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static char *replay_filename;
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ReplayState replay_state;
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static GSList *replay_blockers;
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bool replay_next_event_is(int event)
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{
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bool res = false;
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/* nothing to skip - not all instructions used */
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if (replay_state.instructions_count != 0) {
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assert(replay_data_kind == EVENT_INSTRUCTION);
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return event == EVENT_INSTRUCTION;
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}
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while (true) {
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if (event == replay_data_kind) {
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res = true;
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}
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switch (replay_data_kind) {
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case EVENT_SHUTDOWN:
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replay_finish_event();
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qemu_system_shutdown_request();
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break;
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default:
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/* clock, time_t, checkpoint and other events */
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return res;
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}
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}
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return res;
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}
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uint64_t replay_get_current_step(void)
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{
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return cpu_get_icount_raw();
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}
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int replay_get_instructions(void)
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{
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int res = 0;
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replay_mutex_lock();
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if (replay_next_event_is(EVENT_INSTRUCTION)) {
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res = replay_state.instructions_count;
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}
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replay_mutex_unlock();
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return res;
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}
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void replay_account_executed_instructions(void)
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{
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if (replay_mode == REPLAY_MODE_PLAY) {
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replay_mutex_lock();
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if (replay_state.instructions_count > 0) {
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int count = (int)(replay_get_current_step()
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- replay_state.current_step);
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replay_state.instructions_count -= count;
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replay_state.current_step += count;
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if (replay_state.instructions_count == 0) {
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assert(replay_data_kind == EVENT_INSTRUCTION);
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replay_finish_event();
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/* Wake up iothread. This is required because
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timers will not expire until clock counters
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will be read from the log. */
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qemu_notify_event();
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}
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}
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replay_mutex_unlock();
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}
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}
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bool replay_exception(void)
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{
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if (replay_mode == REPLAY_MODE_RECORD) {
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replay_save_instructions();
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replay_mutex_lock();
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replay_put_event(EVENT_EXCEPTION);
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replay_mutex_unlock();
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return true;
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} else if (replay_mode == REPLAY_MODE_PLAY) {
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bool res = replay_has_exception();
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if (res) {
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replay_mutex_lock();
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replay_finish_event();
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replay_mutex_unlock();
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}
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return res;
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}
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return true;
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}
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bool replay_has_exception(void)
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{
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bool res = false;
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if (replay_mode == REPLAY_MODE_PLAY) {
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replay_account_executed_instructions();
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replay_mutex_lock();
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res = replay_next_event_is(EVENT_EXCEPTION);
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replay_mutex_unlock();
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}
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return res;
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}
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bool replay_interrupt(void)
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{
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if (replay_mode == REPLAY_MODE_RECORD) {
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replay_save_instructions();
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replay_mutex_lock();
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replay_put_event(EVENT_INTERRUPT);
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replay_mutex_unlock();
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return true;
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} else if (replay_mode == REPLAY_MODE_PLAY) {
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bool res = replay_has_interrupt();
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if (res) {
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replay_mutex_lock();
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replay_finish_event();
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replay_mutex_unlock();
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}
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return res;
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}
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return true;
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}
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bool replay_has_interrupt(void)
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{
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bool res = false;
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if (replay_mode == REPLAY_MODE_PLAY) {
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replay_account_executed_instructions();
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replay_mutex_lock();
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res = replay_next_event_is(EVENT_INTERRUPT);
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replay_mutex_unlock();
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}
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return res;
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}
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void replay_shutdown_request(void)
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{
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if (replay_mode == REPLAY_MODE_RECORD) {
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replay_mutex_lock();
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replay_put_event(EVENT_SHUTDOWN);
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replay_mutex_unlock();
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}
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}
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bool replay_checkpoint(ReplayCheckpoint checkpoint)
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{
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bool res = false;
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assert(EVENT_CHECKPOINT + checkpoint <= EVENT_CHECKPOINT_LAST);
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replay_save_instructions();
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if (!replay_file) {
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return true;
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}
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replay_mutex_lock();
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if (replay_mode == REPLAY_MODE_PLAY) {
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if (replay_next_event_is(EVENT_CHECKPOINT + checkpoint)) {
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replay_finish_event();
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} else if (replay_data_kind != EVENT_ASYNC) {
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res = false;
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goto out;
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}
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replay_read_events(checkpoint);
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/* replay_read_events may leave some unread events.
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Return false if not all of the events associated with
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checkpoint were processed */
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res = replay_data_kind != EVENT_ASYNC;
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} else if (replay_mode == REPLAY_MODE_RECORD) {
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replay_put_event(EVENT_CHECKPOINT + checkpoint);
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replay_save_events(checkpoint);
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res = true;
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}
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out:
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replay_mutex_unlock();
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return res;
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}
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static void replay_enable(const char *fname, int mode)
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{
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const char *fmode = NULL;
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assert(!replay_file);
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switch (mode) {
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case REPLAY_MODE_RECORD:
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fmode = "wb";
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break;
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case REPLAY_MODE_PLAY:
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fmode = "rb";
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break;
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default:
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fprintf(stderr, "Replay: internal error: invalid replay mode\n");
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exit(1);
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}
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atexit(replay_finish);
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replay_mutex_init();
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replay_file = fopen(fname, fmode);
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if (replay_file == NULL) {
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fprintf(stderr, "Replay: open %s: %s\n", fname, strerror(errno));
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exit(1);
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}
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replay_filename = g_strdup(fname);
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replay_mode = mode;
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replay_data_kind = -1;
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replay_state.instructions_count = 0;
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replay_state.current_step = 0;
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/* skip file header for RECORD and check it for PLAY */
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if (replay_mode == REPLAY_MODE_RECORD) {
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fseek(replay_file, HEADER_SIZE, SEEK_SET);
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} else if (replay_mode == REPLAY_MODE_PLAY) {
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unsigned int version = replay_get_dword();
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if (version != REPLAY_VERSION) {
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fprintf(stderr, "Replay: invalid input log file version\n");
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exit(1);
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}
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/* go to the beginning */
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fseek(replay_file, HEADER_SIZE, SEEK_SET);
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replay_fetch_data_kind();
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}
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replay_init_events();
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}
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void replay_configure(QemuOpts *opts)
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{
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const char *fname;
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const char *rr;
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ReplayMode mode = REPLAY_MODE_NONE;
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rr = qemu_opt_get(opts, "rr");
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if (!rr) {
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/* Just enabling icount */
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return;
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} else if (!strcmp(rr, "record")) {
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mode = REPLAY_MODE_RECORD;
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} else if (!strcmp(rr, "replay")) {
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mode = REPLAY_MODE_PLAY;
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} else {
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error_report("Invalid icount rr option: %s", rr);
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exit(1);
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}
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fname = qemu_opt_get(opts, "rrfile");
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if (!fname) {
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error_report("File name not specified for replay");
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exit(1);
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}
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replay_enable(fname, mode);
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}
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void replay_start(void)
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{
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if (replay_mode == REPLAY_MODE_NONE) {
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return;
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}
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if (replay_blockers) {
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error_report("Record/replay: %s",
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error_get_pretty(replay_blockers->data));
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exit(1);
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}
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if (!use_icount) {
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error_report("Please enable icount to use record/replay");
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exit(1);
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}
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/* Timer for snapshotting will be set up here. */
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replay_enable_events();
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}
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void replay_finish(void)
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{
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if (replay_mode == REPLAY_MODE_NONE) {
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return;
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}
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replay_save_instructions();
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/* finalize the file */
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if (replay_file) {
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if (replay_mode == REPLAY_MODE_RECORD) {
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/* write end event */
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replay_put_event(EVENT_END);
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/* write header */
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fseek(replay_file, 0, SEEK_SET);
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replay_put_dword(REPLAY_VERSION);
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}
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fclose(replay_file);
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replay_file = NULL;
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}
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if (replay_filename) {
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g_free(replay_filename);
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replay_filename = NULL;
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}
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replay_finish_events();
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replay_mutex_destroy();
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}
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void replay_add_blocker(Error *reason)
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{
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replay_blockers = g_slist_prepend(replay_blockers, reason);
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}
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