2020-10-03 19:13:20 +02:00
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/*
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* replay-debugging.c
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*
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* Copyright (c) 2010-2020 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 "qapi/error.h"
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#include "sysemu/replay.h"
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2020-10-03 19:13:26 +02:00
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#include "sysemu/runstate.h"
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2020-10-03 19:13:20 +02:00
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#include "replay-internal.h"
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#include "monitor/hmp.h"
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#include "monitor/monitor.h"
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#include "qapi/qapi-commands-replay.h"
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2020-10-03 19:13:26 +02:00
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#include "qapi/qmp/qdict.h"
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#include "qemu/timer.h"
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2020-10-03 19:13:31 +02:00
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#include "block/snapshot.h"
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#include "migration/snapshot.h"
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2020-10-03 19:13:20 +02:00
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2020-10-03 19:13:43 +02:00
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static bool replay_is_debugging;
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2020-10-03 19:13:49 +02:00
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static int64_t replay_last_breakpoint;
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static int64_t replay_last_snapshot;
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2020-10-03 19:13:43 +02:00
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bool replay_running_debug(void)
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{
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return replay_is_debugging;
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}
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2020-10-03 19:13:20 +02:00
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void hmp_info_replay(Monitor *mon, const QDict *qdict)
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{
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if (replay_mode == REPLAY_MODE_NONE) {
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monitor_printf(mon, "Record/replay is not active\n");
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} else {
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monitor_printf(mon,
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"%s execution '%s': instruction count = %"PRId64"\n",
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replay_mode == REPLAY_MODE_RECORD ? "Recording" : "Replaying",
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replay_get_filename(), replay_get_current_icount());
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}
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}
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ReplayInfo *qmp_query_replay(Error **errp)
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{
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ReplayInfo *retval = g_new0(ReplayInfo, 1);
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retval->mode = replay_mode;
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if (replay_get_filename()) {
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retval->filename = g_strdup(replay_get_filename());
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retval->has_filename = true;
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}
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retval->icount = replay_get_current_icount();
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return retval;
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}
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2020-10-03 19:13:26 +02:00
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static void replay_break(uint64_t icount, QEMUTimerCB callback, void *opaque)
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{
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assert(replay_mode == REPLAY_MODE_PLAY);
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assert(replay_mutex_locked());
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assert(replay_break_icount >= replay_get_current_icount());
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assert(callback);
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replay_break_icount = icount;
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if (replay_break_timer) {
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timer_del(replay_break_timer);
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}
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replay_break_timer = timer_new_ns(QEMU_CLOCK_REALTIME,
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callback, opaque);
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}
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static void replay_delete_break(void)
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{
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assert(replay_mode == REPLAY_MODE_PLAY);
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assert(replay_mutex_locked());
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if (replay_break_timer) {
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timer_del(replay_break_timer);
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timer_free(replay_break_timer);
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replay_break_timer = NULL;
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}
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replay_break_icount = -1ULL;
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}
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static void replay_stop_vm(void *opaque)
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{
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vm_stop(RUN_STATE_PAUSED);
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replay_delete_break();
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}
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void qmp_replay_break(int64_t icount, Error **errp)
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{
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if (replay_mode == REPLAY_MODE_PLAY) {
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if (icount >= replay_get_current_icount()) {
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replay_break(icount, replay_stop_vm, NULL);
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} else {
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error_setg(errp,
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"cannot set breakpoint at the instruction in the past");
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}
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} else {
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error_setg(errp, "setting the breakpoint is allowed only in play mode");
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}
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}
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void hmp_replay_break(Monitor *mon, const QDict *qdict)
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{
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int64_t icount = qdict_get_try_int(qdict, "icount", -1LL);
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Error *err = NULL;
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qmp_replay_break(icount, &err);
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if (err) {
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error_report_err(err);
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return;
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}
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}
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void qmp_replay_delete_break(Error **errp)
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{
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if (replay_mode == REPLAY_MODE_PLAY) {
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replay_delete_break();
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} else {
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error_setg(errp, "replay breakpoints are allowed only in play mode");
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}
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}
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void hmp_replay_delete_break(Monitor *mon, const QDict *qdict)
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{
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Error *err = NULL;
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qmp_replay_delete_break(&err);
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if (err) {
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error_report_err(err);
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return;
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}
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}
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2020-10-03 19:13:31 +02:00
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static char *replay_find_nearest_snapshot(int64_t icount,
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int64_t *snapshot_icount)
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{
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BlockDriverState *bs;
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QEMUSnapshotInfo *sn_tab;
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QEMUSnapshotInfo *nearest = NULL;
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char *ret = NULL;
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int nb_sns, i;
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AioContext *aio_context;
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*snapshot_icount = -1;
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bs = bdrv_all_find_vmstate_bs();
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if (!bs) {
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goto fail;
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}
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aio_context = bdrv_get_aio_context(bs);
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aio_context_acquire(aio_context);
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nb_sns = bdrv_snapshot_list(bs, &sn_tab);
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aio_context_release(aio_context);
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for (i = 0; i < nb_sns; i++) {
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if (bdrv_all_find_snapshot(sn_tab[i].name, &bs) == 0) {
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if (sn_tab[i].icount != -1ULL
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&& sn_tab[i].icount <= icount
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&& (!nearest || nearest->icount < sn_tab[i].icount)) {
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nearest = &sn_tab[i];
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}
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}
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}
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if (nearest) {
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ret = g_strdup(nearest->name);
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*snapshot_icount = nearest->icount;
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}
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g_free(sn_tab);
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fail:
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return ret;
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}
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static void replay_seek(int64_t icount, QEMUTimerCB callback, Error **errp)
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{
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char *snapshot = NULL;
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int64_t snapshot_icount;
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if (replay_mode != REPLAY_MODE_PLAY) {
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error_setg(errp, "replay must be enabled to seek");
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return;
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}
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snapshot = replay_find_nearest_snapshot(icount, &snapshot_icount);
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if (snapshot) {
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if (icount < replay_get_current_icount()
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|| replay_get_current_icount() < snapshot_icount) {
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vm_stop(RUN_STATE_RESTORE_VM);
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load_snapshot(snapshot, errp);
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}
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g_free(snapshot);
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}
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if (replay_get_current_icount() <= icount) {
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replay_break(icount, callback, NULL);
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vm_start();
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} else {
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error_setg(errp, "cannot seek to the specified instruction count");
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}
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}
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void qmp_replay_seek(int64_t icount, Error **errp)
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{
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replay_seek(icount, replay_stop_vm, errp);
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}
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void hmp_replay_seek(Monitor *mon, const QDict *qdict)
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{
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int64_t icount = qdict_get_try_int(qdict, "icount", -1LL);
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Error *err = NULL;
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qmp_replay_seek(icount, &err);
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if (err) {
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error_report_err(err);
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return;
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}
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}
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2020-10-03 19:13:43 +02:00
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static void replay_stop_vm_debug(void *opaque)
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{
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replay_is_debugging = false;
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vm_stop(RUN_STATE_DEBUG);
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replay_delete_break();
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}
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bool replay_reverse_step(void)
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{
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Error *err = NULL;
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assert(replay_mode == REPLAY_MODE_PLAY);
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if (replay_get_current_icount() != 0) {
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replay_seek(replay_get_current_icount() - 1,
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replay_stop_vm_debug, &err);
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if (err) {
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error_free(err);
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return false;
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}
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replay_is_debugging = true;
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return true;
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}
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return false;
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}
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2020-10-03 19:13:49 +02:00
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static void replay_continue_end(void)
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{
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replay_is_debugging = false;
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vm_stop(RUN_STATE_DEBUG);
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replay_delete_break();
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}
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static void replay_continue_stop(void *opaque)
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{
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Error *err = NULL;
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if (replay_last_breakpoint != -1LL) {
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replay_seek(replay_last_breakpoint, replay_stop_vm_debug, &err);
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if (err) {
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error_free(err);
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replay_continue_end();
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}
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return;
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}
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/*
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* No breakpoints since the last snapshot.
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* Find previous snapshot and try again.
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*/
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if (replay_last_snapshot != 0) {
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replay_seek(replay_last_snapshot - 1, replay_continue_stop, &err);
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if (err) {
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error_free(err);
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replay_continue_end();
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}
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replay_last_snapshot = replay_get_current_icount();
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} else {
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/* Seek to the very first step */
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replay_seek(0, replay_stop_vm_debug, &err);
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if (err) {
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error_free(err);
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replay_continue_end();
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}
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}
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}
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bool replay_reverse_continue(void)
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{
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Error *err = NULL;
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assert(replay_mode == REPLAY_MODE_PLAY);
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if (replay_get_current_icount() != 0) {
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replay_seek(replay_get_current_icount() - 1,
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replay_continue_stop, &err);
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if (err) {
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error_free(err);
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return false;
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}
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replay_last_breakpoint = -1LL;
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replay_is_debugging = true;
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replay_last_snapshot = replay_get_current_icount();
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return true;
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}
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return false;
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}
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void replay_breakpoint(void)
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{
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assert(replay_mode == REPLAY_MODE_PLAY);
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replay_last_breakpoint = replay_get_current_icount();
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}
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2020-10-03 19:14:01 +02:00
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void replay_gdb_attached(void)
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{
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/*
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* Create VM snapshot on temporary overlay to allow reverse
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* debugging even if snapshots were not enabled.
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*/
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if (replay_mode == REPLAY_MODE_PLAY
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&& !replay_snapshot) {
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if (save_snapshot("start_debugging", NULL) != 0) {
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/* Can't create the snapshot. Continue conventional debugging. */
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}
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}
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}
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