mirror of
https://github.com/lewurm/savezelda.git
synced 2024-11-18 00:29:19 +01:00
46 lines
1.5 KiB
ArmAsm
46 lines
1.5 KiB
ArmAsm
# 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:
|