From 0d990b375cf9b27ff72f0a0ab0e524a6b9cac14f Mon Sep 17 00:00:00 2001
From: Ry <ryanst755@gmail.com>
Date: Fri, 18 Mar 2022 21:59:51 -0700
Subject: [PATCH] fox32rom: Add panic routine

---
 fox32rom.def |  1 +
 main.asm     |  2 ++
 panic.asm    | 18 ++++++++++++++++++
 3 files changed, 21 insertions(+)
 create mode 100644 panic.asm

diff --git a/fox32rom.def b/fox32rom.def
index 74a3f3d..6d270fc 100644
--- a/fox32rom.def
+++ b/fox32rom.def
@@ -7,6 +7,7 @@ get_mouse_position:                       jmp [0xF0040008]
 new_event:                                jmp [0xF004000C]
 wait_for_event:                           jmp [0xF0040010]
 get_next_event:                           jmp [0xF0040014]
+panic:                                    jmp [0xF0040018]
 
 ; generic drawing jump table
 draw_str_generic:                         jmp [0xF0041000]
diff --git a/main.asm b/main.asm
index e7913b3..4aee0fa 100644
--- a/main.asm
+++ b/main.asm
@@ -154,6 +154,7 @@ get_rom_version:
     #include "menu_bar.asm"
     #include "mouse.asm"
     #include "overlay.asm"
+    #include "panic.asm"
     #include "vsync.asm"
 
 
@@ -170,6 +171,7 @@ get_rom_version:
     data.32 new_event
     data.32 wait_for_event
     data.32 get_next_event
+    data.32 panic
 
     ; generic drawing jump table
     org.pad 0xF0041000
diff --git a/panic.asm b/panic.asm
new file mode 100644
index 0000000..83a5405
--- /dev/null
+++ b/panic.asm
@@ -0,0 +1,18 @@
+; panic routines
+
+; panic and hang
+; inputs:
+; r0: pointer to null-terminated string, or zero for none
+; outputs:
+; none, does not return
+panic:
+    icl
+    brk
+    cmp r0, 0
+    ifnz mov r0, panic_string
+    call debug_print
+panic_loop:
+    jmp panic_loop
+    halt
+
+panic_string: data.str "Panic occurred!" data.8 10 data.8 0