update github CI for autotest

os/src/lang_items.rs

@@ -18,7 +18,7 @@ fn panic(info: &PanicInfo) -> ! {
     unsafe {
         backtrace();
     }
-    shutdown()
+    shutdown(255)
 }
 
 unsafe fn backtrace() {

os/src/sbi.rs

@@ -39,7 +39,7 @@ pub fn console_getchar() -> usize {
     sbi_call(SBI_CONSOLE_GETCHAR, 0, 0, 0)
 }
 
-pub fn shutdown() -> ! {
+pub fn shutdown(exit_code: usize) -> ! {
     sbi_call(SBI_SHUTDOWN, 0, 0, 0);
     panic!("It should shutdown!");
 }

os/src/task/mod.rs

@@ -74,8 +74,15 @@ pub fn exit_current_and_run_next(exit_code: i32) {
     if tid == 0 {
         let pid = process.getpid();
         if pid == IDLE_PID {
-            println!("[kernel] Idle process exit ...");
-            crate::sbi::shutdown();
+            println!(
+                "[kernel] Idle process exit with exit_code {} ...",
+                exit_code
+            );
+            if exit_code != 0 {
+                crate::sbi::shutdown(255); //255 == -1 for err hint
+            } else {
+                crate::sbi::shutdown(0); //0 for success hint
+            }
         }
         remove_from_pid2process(pid);
         let mut process_inner = process.inner_exclusive_access();