388 lines
9.6 KiB
C
388 lines
9.6 KiB
C
/*
|
|
* 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/osdep.h"
|
|
#include "qapi/error.h"
|
|
#include "sysemu/cpu-timers.h"
|
|
#include "sysemu/replay.h"
|
|
#include "sysemu/runstate.h"
|
|
#include "replay-internal.h"
|
|
#include "qemu/main-loop.h"
|
|
#include "qemu/option.h"
|
|
#include "sysemu/cpus.h"
|
|
#include "qemu/error-report.h"
|
|
|
|
/* Current version of the replay mechanism.
|
|
Increase it when file format changes. */
|
|
#define REPLAY_VERSION 0xe0200c
|
|
/* Size of replay log header */
|
|
#define HEADER_SIZE (sizeof(uint32_t) + sizeof(uint64_t))
|
|
|
|
ReplayMode replay_mode = REPLAY_MODE_NONE;
|
|
char *replay_snapshot;
|
|
|
|
/* Name of replay file */
|
|
static char *replay_filename;
|
|
ReplayState replay_state;
|
|
static GSList *replay_blockers;
|
|
|
|
/* Replay breakpoints */
|
|
uint64_t replay_break_icount = -1ULL;
|
|
QEMUTimer *replay_break_timer;
|
|
|
|
bool replay_next_event_is(int event)
|
|
{
|
|
bool res = false;
|
|
|
|
/* nothing to skip - not all instructions used */
|
|
if (replay_state.instruction_count != 0) {
|
|
assert(replay_state.data_kind == EVENT_INSTRUCTION);
|
|
return event == EVENT_INSTRUCTION;
|
|
}
|
|
|
|
while (true) {
|
|
unsigned int data_kind = replay_state.data_kind;
|
|
if (event == data_kind) {
|
|
res = true;
|
|
}
|
|
switch (data_kind) {
|
|
case EVENT_SHUTDOWN ... EVENT_SHUTDOWN_LAST:
|
|
replay_finish_event();
|
|
qemu_system_shutdown_request(data_kind - EVENT_SHUTDOWN);
|
|
break;
|
|
default:
|
|
/* clock, time_t, checkpoint and other events */
|
|
return res;
|
|
}
|
|
}
|
|
return res;
|
|
}
|
|
|
|
uint64_t replay_get_current_icount(void)
|
|
{
|
|
return icount_get_raw();
|
|
}
|
|
|
|
int replay_get_instructions(void)
|
|
{
|
|
int res = 0;
|
|
replay_mutex_lock();
|
|
if (replay_next_event_is(EVENT_INSTRUCTION)) {
|
|
res = replay_state.instruction_count;
|
|
if (replay_break_icount != -1LL) {
|
|
uint64_t current = replay_get_current_icount();
|
|
assert(replay_break_icount >= current);
|
|
if (current + res > replay_break_icount) {
|
|
res = replay_break_icount - current;
|
|
}
|
|
}
|
|
}
|
|
replay_mutex_unlock();
|
|
return res;
|
|
}
|
|
|
|
void replay_account_executed_instructions(void)
|
|
{
|
|
if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
if (replay_state.instruction_count > 0) {
|
|
replay_advance_current_icount(replay_get_current_icount());
|
|
}
|
|
}
|
|
}
|
|
|
|
bool replay_exception(void)
|
|
{
|
|
|
|
if (replay_mode == REPLAY_MODE_RECORD) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_save_instructions();
|
|
replay_put_event(EVENT_EXCEPTION);
|
|
return true;
|
|
} else if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
bool res = replay_has_exception();
|
|
if (res) {
|
|
replay_finish_event();
|
|
}
|
|
return res;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool replay_has_exception(void)
|
|
{
|
|
bool res = false;
|
|
if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_account_executed_instructions();
|
|
res = replay_next_event_is(EVENT_EXCEPTION);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
bool replay_interrupt(void)
|
|
{
|
|
if (replay_mode == REPLAY_MODE_RECORD) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_save_instructions();
|
|
replay_put_event(EVENT_INTERRUPT);
|
|
return true;
|
|
} else if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
bool res = replay_has_interrupt();
|
|
if (res) {
|
|
replay_finish_event();
|
|
}
|
|
return res;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool replay_has_interrupt(void)
|
|
{
|
|
bool res = false;
|
|
if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_account_executed_instructions();
|
|
res = replay_next_event_is(EVENT_INTERRUPT);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
void replay_shutdown_request(ShutdownCause cause)
|
|
{
|
|
if (replay_mode == REPLAY_MODE_RECORD) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_put_event(EVENT_SHUTDOWN + cause);
|
|
}
|
|
}
|
|
|
|
bool replay_checkpoint(ReplayCheckpoint checkpoint)
|
|
{
|
|
assert(EVENT_CHECKPOINT + checkpoint <= EVENT_CHECKPOINT_LAST);
|
|
|
|
replay_save_instructions();
|
|
|
|
if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
if (replay_next_event_is(EVENT_CHECKPOINT + checkpoint)) {
|
|
replay_finish_event();
|
|
} else {
|
|
return false;
|
|
}
|
|
} else if (replay_mode == REPLAY_MODE_RECORD) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_put_event(EVENT_CHECKPOINT + checkpoint);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void replay_async_events(void)
|
|
{
|
|
static bool processing = false;
|
|
/*
|
|
* If we are already processing the events, recursion may occur
|
|
* in case of incorrect implementation when HW event modifies timers.
|
|
* Timer modification may invoke the icount warp, event processing,
|
|
* and cause the recursion.
|
|
*/
|
|
g_assert(!processing);
|
|
processing = true;
|
|
|
|
replay_save_instructions();
|
|
|
|
if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_read_events();
|
|
} else if (replay_mode == REPLAY_MODE_RECORD) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_save_events();
|
|
}
|
|
processing = false;
|
|
}
|
|
|
|
bool replay_has_event(void)
|
|
{
|
|
bool res = false;
|
|
if (replay_mode == REPLAY_MODE_PLAY) {
|
|
g_assert(replay_mutex_locked());
|
|
replay_account_executed_instructions();
|
|
res = EVENT_CHECKPOINT <= replay_state.data_kind
|
|
&& replay_state.data_kind <= EVENT_CHECKPOINT_LAST;
|
|
res = res || (EVENT_ASYNC <= replay_state.data_kind
|
|
&& replay_state.data_kind <= EVENT_ASYNC_LAST);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static void replay_enable(const char *fname, int mode)
|
|
{
|
|
const char *fmode = NULL;
|
|
assert(!replay_file);
|
|
|
|
switch (mode) {
|
|
case REPLAY_MODE_RECORD:
|
|
fmode = "wb";
|
|
break;
|
|
case REPLAY_MODE_PLAY:
|
|
fmode = "rb";
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Replay: internal error: invalid replay mode\n");
|
|
exit(1);
|
|
}
|
|
|
|
atexit(replay_finish);
|
|
|
|
replay_file = fopen(fname, fmode);
|
|
if (replay_file == NULL) {
|
|
fprintf(stderr, "Replay: open %s: %s\n", fname, strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
replay_filename = g_strdup(fname);
|
|
replay_mode = mode;
|
|
replay_mutex_init();
|
|
|
|
replay_state.data_kind = -1;
|
|
replay_state.instruction_count = 0;
|
|
replay_state.current_icount = 0;
|
|
replay_state.has_unread_data = 0;
|
|
|
|
/* skip file header for RECORD and check it for PLAY */
|
|
if (replay_mode == REPLAY_MODE_RECORD) {
|
|
fseek(replay_file, HEADER_SIZE, SEEK_SET);
|
|
} else if (replay_mode == REPLAY_MODE_PLAY) {
|
|
unsigned int version = replay_get_dword();
|
|
if (version != REPLAY_VERSION) {
|
|
fprintf(stderr, "Replay: invalid input log file version\n");
|
|
exit(1);
|
|
}
|
|
/* go to the beginning */
|
|
fseek(replay_file, HEADER_SIZE, SEEK_SET);
|
|
replay_fetch_data_kind();
|
|
}
|
|
|
|
replay_init_events();
|
|
}
|
|
|
|
void replay_configure(QemuOpts *opts)
|
|
{
|
|
const char *fname;
|
|
const char *rr;
|
|
ReplayMode mode = REPLAY_MODE_NONE;
|
|
Location loc;
|
|
|
|
if (!opts) {
|
|
return;
|
|
}
|
|
|
|
loc_push_none(&loc);
|
|
qemu_opts_loc_restore(opts);
|
|
|
|
rr = qemu_opt_get(opts, "rr");
|
|
if (!rr) {
|
|
/* Just enabling icount */
|
|
goto out;
|
|
} else if (!strcmp(rr, "record")) {
|
|
mode = REPLAY_MODE_RECORD;
|
|
} else if (!strcmp(rr, "replay")) {
|
|
mode = REPLAY_MODE_PLAY;
|
|
} else {
|
|
error_report("Invalid icount rr option: %s", rr);
|
|
exit(1);
|
|
}
|
|
|
|
fname = qemu_opt_get(opts, "rrfile");
|
|
if (!fname) {
|
|
error_report("File name not specified for replay");
|
|
exit(1);
|
|
}
|
|
|
|
replay_snapshot = g_strdup(qemu_opt_get(opts, "rrsnapshot"));
|
|
replay_vmstate_register();
|
|
replay_enable(fname, mode);
|
|
|
|
out:
|
|
loc_pop(&loc);
|
|
}
|
|
|
|
void replay_start(void)
|
|
{
|
|
if (replay_mode == REPLAY_MODE_NONE) {
|
|
return;
|
|
}
|
|
|
|
if (replay_blockers) {
|
|
error_reportf_err(replay_blockers->data, "Record/replay: ");
|
|
exit(1);
|
|
}
|
|
if (!icount_enabled()) {
|
|
error_report("Please enable icount to use record/replay");
|
|
exit(1);
|
|
}
|
|
|
|
/* Timer for snapshotting will be set up here. */
|
|
|
|
replay_enable_events();
|
|
}
|
|
|
|
void replay_finish(void)
|
|
{
|
|
if (replay_mode == REPLAY_MODE_NONE) {
|
|
return;
|
|
}
|
|
|
|
replay_save_instructions();
|
|
|
|
/* finalize the file */
|
|
if (replay_file) {
|
|
if (replay_mode == REPLAY_MODE_RECORD) {
|
|
/*
|
|
* Can't do it in the signal handler, therefore
|
|
* add shutdown event here for the case of Ctrl-C.
|
|
*/
|
|
replay_shutdown_request(SHUTDOWN_CAUSE_HOST_SIGNAL);
|
|
/* write end event */
|
|
replay_put_event(EVENT_END);
|
|
|
|
/* write header */
|
|
fseek(replay_file, 0, SEEK_SET);
|
|
replay_put_dword(REPLAY_VERSION);
|
|
}
|
|
|
|
fclose(replay_file);
|
|
replay_file = NULL;
|
|
}
|
|
g_free(replay_filename);
|
|
replay_filename = NULL;
|
|
|
|
g_free(replay_snapshot);
|
|
replay_snapshot = NULL;
|
|
|
|
replay_finish_events();
|
|
replay_mode = REPLAY_MODE_NONE;
|
|
}
|
|
|
|
void replay_add_blocker(Error *reason)
|
|
{
|
|
replay_blockers = g_slist_prepend(replay_blockers, reason);
|
|
}
|
|
|
|
const char *replay_get_filename(void)
|
|
{
|
|
return replay_filename;
|
|
}
|