LEGO Star Wars by roto

[savezelda.git] / lsw / exploit2.s

diff --git a/lsw/exploit2.s b/lsw/exploit2.s
new file mode 100644 (file)
index 0000000..a845958
--- /dev/null
+++ b/lsw/exploit2.s
@@ -0,0 +1,57 @@
+# Copyright 2008-2009  Segher Boessenkool  <segher@kernel.crashing.org>
+# Copyright      2011  roto <roto@mozy.org>
+# Copyright      2011  Bernhard Urban <lewurm@gmail.com>
+# 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
+
+       bptr = 0x91178ea0
+       save = 0x91177f40
+       main = 0x90000020
+
+       audio_stop_usa = 0x8038ce9c
+       video_stop_usa = 0x8039971c
+
+       audio_stop_eur = 0x8038cfec
+       video_stop_eur = 0x80399708
+
+       audio_stop_data = 0x9421fff0 # stwu 1,-16(1)
+       video_stop_data = 0x9421ffe0 # stwu 1,-32(1)
+
+       # Set up a stack frame.
+       lis 1,0x8080 ; li 0,0 ; stwu 0,-64(1)
+
+       # Stop audio.
+       lis 10,audio_stop_data@h ; ori 10,10,audio_stop_data@l
+       lis 3,audio_stop_usa@h ; ori 3,3,audio_stop_usa@l; lwz 5,0(3)
+       cmpw 5,10 ; beq execa
+       lis 3,audio_stop_eur@h ; ori 3,3,audio_stop_eur@l
+execa:
+       mtctr 3 ; bctrl
+
+       # Stop video.
+       lis 10,video_stop_data@h ; ori 10,10,video_stop_data@l
+       lis 3,video_stop_usa@h ; ori 3,3,video_stop_usa@l; lwz 5,0(3)
+       cmpw 5,10 ; beq execv
+       lis 3,video_stop_eur@h ; ori 3,3,video_stop_eur@l
+execv:
+       mtctr 3 ; 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,save@h ; ori 4,4,save@l ; addi 4,4,-4
+
+       addis 4,4,1 ; addi 4,4,exploitlen # offset for exploit.bin
+
+       li 0,0x2000 ; mtctr 0
+loop1:
+       lwzu 0,4(4) ; stwu 0,4(5) ; bdnz loop1
+
+       # Sync caches on it.
+       li 0,0x0400 ; mtctr 0 ; mr 5,3
+loop2:
+       dcbst 0,5 ; sync ; icbi 0,5 ; addi 5,5,0x20 ; bdnz loop2
+       sync ; isync
+
+       # Go for it!
+       mtctr 3 ; bctr