diff --git a/src/main.c b/src/main.c
index 1c1c4ec..235b0ca 100644
--- a/src/main.c
+++ b/src/main.c
@@ -95,6 +95,21 @@ static void check_keyevents(void) {
     }
 }
 
+__attribute__((noreturn)) void halt(void) {
+    term_kprint("SYSTEM HALTED");
+
+    set_statusbar(tick_ctr, shift_state, alpha_state, get_battery_voltage());
+    set_menubar();
+
+    dclear(C_BLACK);
+    tgrid_display();
+    dupdate();
+
+    while (1) {
+        getkey();
+    }
+}
+
 int main(int isappli, int optnum) {
     term_kprintf("main(%d, %d)", isappli, optnum);
 
@@ -166,7 +181,8 @@ int main(int isappli, int optnum) {
 
         // first, backup current scheduler context
         const int ret = setjmp(sched_ctxbuf);
-        if (ret == 0) {
+        switch (ret) {
+        case 0:
             // pause timer during sheduler operations, we restart it before resuming a job
             timer_pause(timer_sched);
 
@@ -174,34 +190,24 @@ int main(int isappli, int optnum) {
             timer_start(timer_sched);
             must_yield = 0;
             job_resume(current_job_id);
-        } else if (ret == 1) {
+            break;
+        case 1:
             job_GC(current_job_id);
             // term_kprintf("job(%d) yield", current_job_id);
             continue;
-        } else if (ret == 2) {
+            break;
+        case 2:
             term_kprintf("job(%d) exit", current_job_id);
             job_free(current_job_id);
-        } else {
+            break;
+        default:
             __builtin_unreachable();
             term_kprint("SHOULD NOT BE REACHED!!!");
-            break;
+            halt();
         }
     }
 
-    term_eprint("SYSTEM HALTED");
-
-    set_statusbar(tick_ctr, shift_state, alpha_state, get_battery_voltage());
-    set_menubar();
-
-    dclear(C_BLACK);
-    tgrid_display();
-    dupdate();
-
-    while (1) {
-        getkey();
-    }
-
-    __builtin_unreachable();
+    halt();
 
     return 1;
 }
\ No newline at end of file