LEGO Batman^H^H^Hhaxx

[savezelda.git] / batman / exploit.s

diff --git a/batman/exploit.s b/batman/exploit.s
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+# Copyright 2008-2009  Segher Boessenkool  <segher@kernel.crashing.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
+
+       .section .start,"ax"
+       retadr = 0x90394140
+
+       # The return addr for the nintendo loader is a bit different as for 3rd
+       # party loaders. In fact, it depends which value is set by the apploader at
+       # 0x8000002c:
+       #  -  0x0: return address is 0x90394140 (some 3rd party loader, e.g. gecko os)
+       #  - 0x23: return address is 0x90394000 (set by the sysmenu loader by nintendo)
+       #  0B ver:                   0x90394100
+       # to make both work, we insert some no op's here
+       .fill (0x140/0x4), 4, 0x60000000
+
+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,(retadr-4)@h ; ori 4,4,(retadr-4)@l
+       # Calculate proper offset for the loader in memory
+0:     lbzu 0,4(4); cmpwi 0,0x60 ; beq 0b
+       addi 4,4,-4; 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: