Fix: lab3 bug

kernel/exception_table.S

@@ -46,11 +46,11 @@
 	ldp x28, x29, [sp, 16 * 14]
 	ldp x30, lr,  [sp, 16 * 15]
 
-  mrs x0, spsr_el1
-  mrs x1, elr_el1
-  mrs x2, esr_el1
   ldp x0, x1,   [sp, 16 * 16]
   ldr x2,       [sp, 16 * 17]
+  msr spsr_el1, x0
+  msr elr_el1,  x1
+  msr esr_el1,  x2
 	add sp, sp, 36 * 8
 .endm
 

kernel/lib/interrupt.c

@@ -105,7 +105,8 @@ void irq_handler(void)
 void wfe(void)
 {
   if (!global_interrupt_pool) {
-    asm volatile("wfe");
+    // asm volatile("wfe");
+    asm volatile("nop");
     return;
   }