From 2d572cea4dad2416d4079950c4b027b68ba9bb44 Mon Sep 17 00:00:00 2001
From: Yi-Ting Shih <ytshih@it.cs.nycu.edu.tw>
Date: Tue, 1 Apr 2025 18:34:59 +0800
Subject: [PATCH] Fix: lab3 bug

---
 kernel/exception_table.S | 6 +++---
 kernel/lib/interrupt.c   | 3 ++-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/kernel/exception_table.S b/kernel/exception_table.S
index 6638a6d..c205beb 100644
--- a/kernel/exception_table.S
+++ b/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
 
diff --git a/kernel/lib/interrupt.c b/kernel/lib/interrupt.c
index 6d17a50..c174e6e 100644
--- a/kernel/lib/interrupt.c
+++ b/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;
   }