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982263ce71
If we find ourselves trying to add an event to the log where time has gone backwards it is because a vCPU event has occurred and the main-loop is not yet aware of time moving forward. This should not happen and if it does its better to fail early than generate a log that will have weird behaviour. Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
210 lines
4.5 KiB
C
210 lines
4.5 KiB
C
/*
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* replay-internal.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/osdep.h"
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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/error-report.h"
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#include "sysemu/sysemu.h"
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/* Mutex to protect reading and writing events to the log.
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data_kind and has_unread_data are also protected
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by this mutex.
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It also protects replay events queue which stores events to be
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written or read to the log. */
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static QemuMutex lock;
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/* File for replay writing */
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FILE *replay_file;
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void replay_put_byte(uint8_t byte)
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{
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if (replay_file) {
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putc(byte, replay_file);
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}
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}
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void replay_put_event(uint8_t event)
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{
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assert(event < EVENT_COUNT);
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replay_put_byte(event);
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}
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void replay_put_word(uint16_t word)
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{
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replay_put_byte(word >> 8);
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replay_put_byte(word);
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}
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void replay_put_dword(uint32_t dword)
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{
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replay_put_word(dword >> 16);
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replay_put_word(dword);
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}
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void replay_put_qword(int64_t qword)
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{
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replay_put_dword(qword >> 32);
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replay_put_dword(qword);
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}
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void replay_put_array(const uint8_t *buf, size_t size)
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{
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if (replay_file) {
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replay_put_dword(size);
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fwrite(buf, 1, size, replay_file);
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}
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}
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uint8_t replay_get_byte(void)
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{
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uint8_t byte = 0;
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if (replay_file) {
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byte = getc(replay_file);
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}
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return byte;
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}
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uint16_t replay_get_word(void)
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{
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uint16_t word = 0;
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if (replay_file) {
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word = replay_get_byte();
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word = (word << 8) + replay_get_byte();
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}
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return word;
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}
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uint32_t replay_get_dword(void)
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{
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uint32_t dword = 0;
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if (replay_file) {
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dword = replay_get_word();
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dword = (dword << 16) + replay_get_word();
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}
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return dword;
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}
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int64_t replay_get_qword(void)
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{
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int64_t qword = 0;
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if (replay_file) {
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qword = replay_get_dword();
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qword = (qword << 32) + replay_get_dword();
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}
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return qword;
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}
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void replay_get_array(uint8_t *buf, size_t *size)
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{
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if (replay_file) {
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*size = replay_get_dword();
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if (fread(buf, 1, *size, replay_file) != *size) {
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error_report("replay read error");
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}
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}
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}
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void replay_get_array_alloc(uint8_t **buf, size_t *size)
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{
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if (replay_file) {
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*size = replay_get_dword();
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*buf = g_malloc(*size);
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if (fread(*buf, 1, *size, replay_file) != *size) {
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error_report("replay read error");
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}
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}
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}
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void replay_check_error(void)
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{
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if (replay_file) {
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if (feof(replay_file)) {
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error_report("replay file is over");
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qemu_system_vmstop_request_prepare();
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qemu_system_vmstop_request(RUN_STATE_PAUSED);
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} else if (ferror(replay_file)) {
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error_report("replay file is over or something goes wrong");
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qemu_system_vmstop_request_prepare();
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qemu_system_vmstop_request(RUN_STATE_INTERNAL_ERROR);
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}
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}
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}
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void replay_fetch_data_kind(void)
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{
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if (replay_file) {
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if (!replay_state.has_unread_data) {
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replay_state.data_kind = replay_get_byte();
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if (replay_state.data_kind == EVENT_INSTRUCTION) {
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replay_state.instructions_count = replay_get_dword();
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}
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replay_check_error();
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replay_state.has_unread_data = 1;
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if (replay_state.data_kind >= EVENT_COUNT) {
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error_report("Replay: unknown event kind %d",
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replay_state.data_kind);
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exit(1);
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}
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}
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}
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}
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void replay_finish_event(void)
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{
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replay_state.has_unread_data = 0;
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replay_fetch_data_kind();
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}
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void replay_mutex_init(void)
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{
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qemu_mutex_init(&lock);
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}
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void replay_mutex_destroy(void)
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{
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qemu_mutex_destroy(&lock);
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}
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void replay_mutex_lock(void)
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{
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qemu_mutex_lock(&lock);
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}
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void replay_mutex_unlock(void)
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{
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qemu_mutex_unlock(&lock);
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}
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/*! Saves cached instructions. */
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void replay_save_instructions(void)
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{
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if (replay_file && replay_mode == REPLAY_MODE_RECORD) {
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replay_mutex_lock();
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int diff = (int)(replay_get_current_step() - replay_state.current_step);
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/* Time can only go forward */
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assert(diff >= 0);
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if (diff > 0) {
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replay_put_event(EVENT_INSTRUCTION);
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replay_put_dword(diff);
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replay_state.current_step += diff;
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}
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replay_mutex_unlock();
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}
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}
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