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https://github.com/lewurm/savezelda.git
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46 lines
1.5 KiB
ArmAsm
46 lines
1.5 KiB
ArmAsm
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# Copyright 2008-2009 Segher Boessenkool <segher@kernel.crashing.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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.section .start,"ax"
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retadr = 0x90394140
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# The return addr for the nintendo loader is a bit different as for 3rd
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# party loaders. In fact, it depends which value is set by the apploader at
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# 0x8000002c:
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# - 0x0: return address is 0x90394140 (some 3rd party loader, e.g. gecko os)
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# - 0x23: return address is 0x90394000 (set by the sysmenu loader by nintendo)
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# 0B ver: 0x90394100
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# to make both work, we insert some no op's here
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.fill (0x140/0x4), 4, 0x60000000
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start:
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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 and video.
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lis 0,audio_stop@h ; ori 0,0,audio_stop@l ; mtctr 0 ; bctrl
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lis 0,video_stop@h ; ori 0,0,video_stop@l ; mtctr 0 ; 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,(retadr-4)@h ; ori 4,4,(retadr-4)@l
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# Calculate proper offset for the loader in memory
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0: lbzu 0,4(4); cmpwi 0,0x60 ; beq 0b
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addi 4,4,-4; addi 4,4,end-start
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li 0,0x2000 ; mtctr 0
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0: lwzu 0,4(4) ; stwu 0,4(5) ; bdnz 0b
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# Sync caches on it.
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li 0,0x0400 ; mtctr 0 ; mr 5,3
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0: dcbst 0,5 ; sync ; icbi 0,5 ; addi 5,5,0x20 ; bdnz 0b
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sync ; isync
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# Go for it!
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mtctr 3 ; bctr
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end:
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