LEGO Indiana Jones

[savezelda.git] / lego / exploit.s

diff --git a/lego/exploit.s b/lego/exploit.s
new file mode 100644 (file)
index 0000000..acc423c
--- /dev/null
+++ b/lego/exploit.s
@@ -0,0 +1,31 @@
+# Copyright 2008-2009  Segher Boessenkool  <segher@kernel.crashing.org>
+# This code is licensed to you under the terms of the GNU GPL, version 2;
+# see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
+
+       .section .start,"ax"
+
+start:
+       # Set up a stack frame.
+       lis 1,0x8080 ; li 0,0 ; stwu 0,-64(1)
+
+       # Stop audio and video.
+       lis 0,audio_stop@h ; ori 0,0,audio_stop@l ; mtctr 0 ; bctrl
+       lis 0,video_stop@h ; ori 0,0,video_stop@l ; mtctr 0 ; bctrl
+
+       # Move code into place; a generous 32kB, starting at 64kB in
+       # the save file.
+
+       lis 3,main@h ; ori 3,3,main@l ; addi 5,3,-4
+       lis 4,0x806c ; lwz 4,0xdc48-0x10000(4) ; addi 4,4,-4
+       addis 4,4,1 ; addi 4,4,end-start
+       li 0,0x2000 ; mtctr 0
+0:     lwzu 0,4(4) ; stwu 0,4(5) ; bdnz 0b
+
+       # Sync caches on it.
+       li 0,0x0400 ; mtctr 0 ; mr 5,3
+0:     dcbst 0,5 ; sync ; icbi 0,5 ; addi 5,5,0x20 ; bdnz 0b
+       sync ; isync
+
+       # Go for it!
+       mtctr 3 ; bctr
+end: