monitor: Return early if invoked while already in the monitor

2022-07-26 17:48:29 -07:00 · 2022-07-26 17:48:29 -07:00 · 1133e97e02
commit 1133e97e02
parent 8ee0214164
1 changed files with 4 additions and 0 deletions
--- 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