mirror of
https://github.com/ApacheThunder/NTR_Launcher.git
synced 2025-06-18 19:15:40 -04:00
de31f9cb2b
* Added DSOnei kernel to included nds files for Stage2 menu. * Added N-Card rom dump to included nds files for Stage2 menu. * Added CycloDS, and DSTWo bootloader dumps to included nds files for Stage2 menu. * DSTwo now boots correctly from cart launcher. * R4 SDHC Gold and other similar DEMON time bomb DSTTi clones now boot correctly from cart launcher. * Added back option for enabling/disabling TWL ram. * Added fixes to allow DS only carts to run with TWL ram enabled. * Initial modcrypt code added for TWL carts. Currently works in emulation however TWL carts will fail to boot on hardware (when twl mode, ram, etc is enabled). * If TWL mode and ram is enabled, cart loader will now load the DSi extended binaries into ram. Currently however they will only boot in emulation. Have not resolved why it's not working on hardware yet. * Stage2 menu now allowed to load dsi extended binaries of SRLs if TWL mode and TWL ram is enabled. Booting rom dumps as a method of booting into TWL carts is confirmed working. At least for System Flaw it does. :D * Despite the improvents Acekard 2i still appears to require using the stage2 menu to boot into. * Fixes that allowed Demon timebomb carts to boot from cart launcher/autoboot may allow other non working carts to work. Further testing needed.
109 lines
3.1 KiB
ArmAsm
Executable File
109 lines
3.1 KiB
ArmAsm
Executable File
@---------------------------------------------------------------------------------
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.section ".init"
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.global _start
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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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mov r0, #0x04000000 @ IME = 0;
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add r0, r0, #0x208
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strh r0, [r0]
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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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@ Load ARM9 region into main RAM
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ldr r1, =__arm9_source_start
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ldr r2, =__arm9_start
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ldr r3, =__arm9_source_end
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sub r3, r3, r1
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bl CopyMem
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@ Start ARM9 binary
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ldr r0, =0x02FFFE24
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ldr r1, =_arm9_start
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str r1, [r0]
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mov r0, #0 @ int argc
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mov r1, #0 @ char *argv[]
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ldr r3, =arm7_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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