mirror of
https://github.com/lewurm/savezelda.git
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58 lines
1.6 KiB
ArmAsm
58 lines
1.6 KiB
ArmAsm
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# Copyright 2008-2009 Segher Boessenkool <segher@kernel.crashing.org>
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# Copyright 2011 roto <roto@mozy.org>
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# Copyright 2011 Bernhard Urban <lewurm@gmail.com>
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# This code is licensed to you under the terms of the GNU GPL, version 2;
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# see file COPYING or http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
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bptr = 0x91178ea0
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save = 0x91177f40
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main = 0x90000020
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audio_stop_usa = 0x8038ce9c
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video_stop_usa = 0x8039971c
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audio_stop_eur = 0x8038cfec
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video_stop_eur = 0x80399708
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audio_stop_data = 0x9421fff0 # stwu 1,-16(1)
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video_stop_data = 0x9421ffe0 # stwu 1,-32(1)
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# Set up a stack frame.
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lis 1,0x8080 ; li 0,0 ; stwu 0,-64(1)
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# Stop audio.
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lis 10,audio_stop_data@h ; ori 10,10,audio_stop_data@l
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lis 3,audio_stop_usa@h ; ori 3,3,audio_stop_usa@l; lwz 5,0(3)
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cmpw 5,10 ; beq execa
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lis 3,audio_stop_eur@h ; ori 3,3,audio_stop_eur@l
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execa:
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mtctr 3 ; bctrl
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# Stop video.
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lis 10,video_stop_data@h ; ori 10,10,video_stop_data@l
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lis 3,video_stop_usa@h ; ori 3,3,video_stop_usa@l; lwz 5,0(3)
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cmpw 5,10 ; beq execv
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lis 3,video_stop_eur@h ; ori 3,3,video_stop_eur@l
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execv:
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mtctr 3 ; bctrl
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# Move code into place; a generous 32kB, starting at 64kB in
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# the save file.
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lis 3,main@h ; ori 3,3,main@l ; addi 5,3,-4
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lis 4,save@h ; ori 4,4,save@l ; addi 4,4,-4
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addis 4,4,1 ; addi 4,4,exploitlen # offset for exploit.bin
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li 0,0x2000 ; mtctr 0
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loop1:
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lwzu 0,4(4) ; stwu 0,4(5) ; bdnz loop1
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# Sync caches on it.
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li 0,0x0400 ; mtctr 0 ; mr 5,3
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loop2:
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dcbst 0,5 ; sync ; icbi 0,5 ; addi 5,5,0x20 ; bdnz loop2
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sync ; isync
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# Go for it!
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mtctr 3 ; bctr
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