From 1133e97e02a3bc37dafb14256477f72230d36692 Mon Sep 17 00:00:00 2001
From: Ry <ryanst755@gmail.com>
Date: Tue, 26 Jul 2022 17:48:29 -0700
Subject: [PATCH] monitor: Return early if invoked while already in the monitor

---
 monitor/monitor.asm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/monitor/monitor.asm b/monitor/monitor.asm
index c5767ee..057ef30 100644
--- a/monitor/monitor.asm
+++ b/monitor/monitor.asm
@@ -1,6 +1,10 @@
 ; debug monitor
 
 invoke_monitor:
+    ; return if we're already in the monitor
+    cmp [0x000003FC], monitor_vsync_handler
+    ifz ret
+
     ; set the vsync handler to our own and reenable interrupts
     mov [MONITOR_OLD_VSYNC_HANDLER], [0x000003FC]
     mov [0x000003FC], monitor_vsync_handler