mirror of
https://github.com/ApacheThunder/GBA-Exploader.git
synced 2025-06-18 11:35:38 -04:00
4ec14bae55
* Soft Reset for Rumble Menu fixed. New scheme is now used for loading SoftReset.xxxx. Now instead it will look for R4TF.nds (R4TF = 4 character ioType code for DLDI user is currently using with R4TF as an example). If not found it will look for a few specific NDS files to try. If those aren't found it will try boot.nds. If boot.nds isn't found then rumble menu will not be available.
148 lines
4.4 KiB
ArmAsm
148 lines
4.4 KiB
ArmAsm
/*-----------------------------------------------------------------
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Copyright (C) 2005 Michael "Chishm" Chisholm
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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If you use this code, please give due credit and email me about your
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project at chishm@hotmail.com
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------------------------------------------------------------------*/
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@---------------------------------------------------------------------------------
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.section ".init"
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.global _start
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.global storedFileCluster
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.global initDisc
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.global wantToPatchDLDI
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.global argStart
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.global argSize
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.global dsiSD
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.global dsiMode
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@---------------------------------------------------------------------------------
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.align 4
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.arm
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@---------------------------------------------------------------------------------
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_start:
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@---------------------------------------------------------------------------------
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b startUp
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storedFileCluster:
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.word 0x0FFFFFFF @ default BOOT.NDS
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initDisc:
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.word 0x00000001 @ init the disc by default
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wantToPatchDLDI:
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.word 0x00000001 @ by default patch the DLDI section of the loaded NDS
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@ Used for passing arguments to the loaded app
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argStart:
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.word _end - _start
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argSize:
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.word 0x00000000
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dldiOffset:
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.word _dldi_start - _start
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dsiSD:
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.word 0
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dsiMode:
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.word 0
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startUp:
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mov r0, #0x04000000
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mov r1, #0
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str r1, [r0,#0x208] @ REG_IME
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str r1, [r0,#0x210] @ REG_IE
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str r1, [r0,#0x218] @ REG_AUXIE
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mov r0, #0x12 @ Switch to IRQ Mode
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msr cpsr, r0
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ldr sp, =__sp_irq @ Set IRQ stack
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mov r0, #0x13 @ Switch to SVC Mode
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msr cpsr, r0
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ldr sp, =__sp_svc @ Set SVC stack
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mov r0, #0x1F @ Switch to System Mode
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msr cpsr, r0
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ldr sp, =__sp_usr @ Set user stack
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ldr r0, =__bss_start @ Clear BSS section to 0x00
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ldr r1, =__bss_end
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sub r1, r1, r0
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bl ClearMem
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mov r0, #0 @ int argc
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mov r1, #0 @ char *argv[]
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ldr r3, =main
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bl _blx_r3_stub @ jump to user code
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@ If the user ever returns, restart
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b _start
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@---------------------------------------------------------------------------------
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_blx_r3_stub:
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@---------------------------------------------------------------------------------
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bx r3
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@---------------------------------------------------------------------------------
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@ Clear memory to 0x00 if length != 0
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@ r0 = Start Address
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@ r1 = Length
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@---------------------------------------------------------------------------------
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ClearMem:
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@---------------------------------------------------------------------------------
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mov r2, #3 @ Round down to nearest word boundary
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add r1, r1, r2 @ Shouldn't be needed
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bics r1, r1, r2 @ Clear 2 LSB (and set Z)
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bxeq lr @ Quit if copy size is 0
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mov r2, #0
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ClrLoop:
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stmia r0!, {r2}
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subs r1, r1, #4
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bne ClrLoop
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bx lr
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@---------------------------------------------------------------------------------
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@ Copy memory if length != 0
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@ r1 = Source Address
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@ r2 = Dest Address
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@ r4 = Dest Address + Length
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@---------------------------------------------------------------------------------
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CopyMemCheck:
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@---------------------------------------------------------------------------------
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sub r3, r4, r2 @ Is there any data to copy?
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@---------------------------------------------------------------------------------
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@ Copy memory
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@ r1 = Source Address
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@ r2 = Dest Address
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@ r3 = Length
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@---------------------------------------------------------------------------------
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CopyMem:
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@---------------------------------------------------------------------------------
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mov r0, #3 @ These commands are used in cases where
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add r3, r3, r0 @ the length is not a multiple of 4,
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bics r3, r3, r0 @ even though it should be.
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bxeq lr @ Length is zero, so exit
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CIDLoop:
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ldmia r1!, {r0}
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stmia r2!, {r0}
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subs r3, r3, #4
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bne CIDLoop
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bx lr
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@---------------------------------------------------------------------------------
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.align
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.pool
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.end
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@---------------------------------------------------------------------------------
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