cpu-exec: introduce loop exit with restore function

This patch introduces loop exit function, which also
restores guest CPU state according to the value of host
program counter.

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Message-Id: <20150710095702.13280.97477.stgit@PASHA-ISP>
Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/cpu-exec.c b/cpu-exec.c
index 713540f..6b6942d 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -134,6 +134,15 @@ void cpu_loop_exit(CPUState *cpu)
     siglongjmp(cpu->jmp_env, 1);
 }
 
+void cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc)
+{
+    if (pc) {
+        cpu_restore_state(cpu, pc);
+    }
+    cpu->current_tb = NULL;
+    siglongjmp(cpu->jmp_env, 1);
+}
+
 /* exit the current TB from a signal handler. The host registers are
    restored in a state compatible with the CPU emulator
  */