When replaying a trace, it is possible to go from shutdown to
running with a reverse-debugging step. This can be useful if the
problem being debugged triggers a reset or shutdown.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
include/sysemu/runstate.h | 1 +
replay/replay.c | 2 ++
softmmu/runstate.c | 19 +++++++++++++++++++
3 files changed, 22 insertions(+)
diff --git a/include/sysemu/runstate.h b/include/sysemu/runstate.h
index 7beb29c2e2..85a1167ccb 100644
--- a/include/sysemu/runstate.h
+++ b/include/sysemu/runstate.h
@@ -9,6 +9,7 @@ void runstate_set(RunState new_state);
RunState runstate_get(void);
bool runstate_is_running(void);
bool runstate_needs_reset(void);
+void runstate_replay_enable(void);
typedef void VMChangeStateHandler(void *opaque, bool running, RunState state);
diff --git a/replay/replay.c b/replay/replay.c
index 0f7d766efe..e64f71209a 100644
--- a/replay/replay.c
+++ b/replay/replay.c
@@ -272,6 +272,8 @@ static void replay_enable(const char *fname, int mode)
/* go to the beginning */
fseek(replay_file, HEADER_SIZE, SEEK_SET);
replay_fetch_data_kind();
+
+ runstate_replay_enable();
}
replay_init_events();
diff --git a/softmmu/runstate.c b/softmmu/runstate.c
index f3bd862818..9fd3e57485 100644
--- a/softmmu/runstate.c
+++ b/softmmu/runstate.c
@@ -174,6 +174,12 @@ static const RunStateTransition runstate_transitions_def[]
= {
{ RUN_STATE__MAX, RUN_STATE__MAX },
};
+static const RunStateTransition replay_runstate_transitions_def[] = {
+ { RUN_STATE_SHUTDOWN, RUN_STATE_RUNNING},
+
+ { RUN_STATE__MAX, RUN_STATE__MAX },
+};
+
static bool runstate_valid_transitions[RUN_STATE__MAX][RUN_STATE__MAX];
bool runstate_check(RunState state)
@@ -181,6 +187,19 @@ bool runstate_check(RunState state)
return current_run_state == state;
}
+void runstate_replay_enable(void)
+{
+ const RunStateTransition *p;
+
+ assert(replay_mode == REPLAY_MODE_PLAY);
+
+ for (p = &replay_runstate_transitions_def[0]; p->from != RUN_STATE__MAX;
+ p++) {
+ runstate_valid_transitions[p->from][p->to] = true;
+ }
+
+}
+
static void runstate_init(void)
{
const RunStateTransition *p;