target-s390x: implement STPT helper

Save the timer target value in the SPT helper, so that the STPT helper
can compute the remaining time.

This allow the Linux kernel to correctly do time accounting.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/target-s390x/misc_helper.c b/target-s390x/misc_helper.c
index 57aee9589c2e444989056b881eaf07ade69b838c..3ec7268b72735f0a6dbbfca135687d45c47a64ae 100644 (file)
--- a/target-s390x/misc_helper.c
+++ b/target-s390x/misc_helper.c
@@ -313,14 +313,15 @@ void HELPER(spt)(CPUS390XState *env, uint64_t time)
     /* nanoseconds */
     time = tod2time(time);
 
-    timer_mod(env->cpu_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + time);
+    env->cputm = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + time;
+
+    timer_mod(env->cpu_timer, env->cputm);
 }
 
 /* Store CPU Timer */
 uint64_t HELPER(stpt)(CPUS390XState *env)
 {
-    /* XXX implement */
-    return 0;
+    return time2tod(env->cputm - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
 }
 
 /* Store System Information */