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replay: initialization and deinitialization

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This patch introduces the functions for enabling the record/replay and for
freeing the resources when simulator closes.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20150917162507.8676.90232.stgit@PASHA-ISP.def.inno>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
This commit is contained in:
Pavel Dovgalyuk 2015-09-17 19:25:07 +03:00 • committed by Paolo Bonzini
parent 8a354bd935
commit 7615936ebf
6 changed files with 156 additions and 0 deletions
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130
replay/replay.c
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@ -15,9 +15,18 @@
#include "qemu/timer.h"
#include "qemu/main-loop.h"
#include "sysemu/sysemu.h"
#include "qemu/error-report.h"
/* Current version of the replay mechanism.
Increase it when file format changes. */
#define REPLAY_VERSION 0xe02002
/* Size of replay log header */
#define HEADER_SIZE (sizeof(uint32_t) + sizeof(uint64_t))
ReplayMode replay_mode = REPLAY_MODE_NONE;
/* Name of replay file */
static char *replay_filename;
ReplayState replay_state;
bool replay_next_event_is(int event)
@ -194,3 +203,124 @@ out:
replay_mutex_unlock();
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_mutex_init();
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_data_kind = -1;
replay_state.instructions_count = 0;
replay_state.current_step = 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;
rr = qemu_opt_get(opts, "rr");
if (!rr) {
/* Just enabling icount */
return;
} 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_enable(fname, mode);
}
void replay_start(void)
{
if (replay_mode == REPLAY_MODE_NONE) {
return;
}
/* 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) {
/* 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;
}
if (replay_filename) {
g_free(replay_filename);
replay_filename = NULL;
}
replay_finish_events();
replay_mutex_destroy();
}