From e22564a29c1662fbdbca5dd8c008136f11a6faa7 Mon Sep 17 00:00:00 2001
From: Corwin Kuiper <corwin@kuiper.dev>
Date: Fri, 25 Jun 2021 23:34:58 +0100
Subject: [PATCH] disable interrupts during handler

---
 agb/interrupt_simple.s | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/agb/interrupt_simple.s b/agb/interrupt_simple.s
index d6cb80d7..940f75b4 100644
--- a/agb/interrupt_simple.s
+++ b/agb/interrupt_simple.s
@@ -6,6 +6,11 @@
 InterruptHandlerSimple:
     ldr r2, =0x04000200 @ interrupt enable register location
 
+    mov r1, #0
+    strh r1, [r2, #8]
+
+    push {r2}
+
     ldrh r1, [r2] @ load 16 bit interrupt enable to r1
     ldrh r3, [r2, #2] @ load 16 bit interrupt request to r3
     and r0, r1, r3 @ interrupts both enabled and requested
@@ -33,5 +38,10 @@ InterruptHandlerSimple:
     bic r2, r2, #0xD
     msr cpsr_c, r2
 
+    pop {r2}
+
+    mov r1, #0
+    strh r1, [r2, #8]
+
     bx lr @ return to bios
 .pool