146 lines
3.7 KiB
ArmAsm
146 lines
3.7 KiB
ArmAsm
;
|
|
; This file is part of Luma3DS
|
|
; Copyright (C) 2016 Aurora Wright, TuxSH
|
|
;
|
|
; This program is free software: you can redistribute it and/or modify
|
|
; it under the terms of the GNU General Public License as published by
|
|
; the Free Software Foundation, either version 3 of the License, or
|
|
; (at your option) any later version.
|
|
;
|
|
; This program is distributed in the hope that it will be useful,
|
|
; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
; GNU General Public License for more details.
|
|
;
|
|
; You should have received a copy of the GNU General Public License
|
|
; along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
;
|
|
; Additional Terms 7.b of GPLv3 applies to this file: Requiring preservation of specified
|
|
; reasonable legal notices or author attributions in that material or in the Appropriate Legal
|
|
; Notices displayed by works containing it.
|
|
;
|
|
|
|
.arm.little
|
|
|
|
.create "build/twl_k11modules.bin", 0
|
|
|
|
.align 4
|
|
.arm
|
|
|
|
patch:
|
|
; r4: Pointer to a pointer to the exheader of the current NCCH
|
|
; sp + 0xb0 - 0xa4: Pointer to the memory location where the NCCH text was loaded
|
|
|
|
add r3, sp, #(0xb0 - 0xa4)
|
|
add r1, sp, #(0xb0 - 0xac)
|
|
|
|
push {r0-r11, lr}
|
|
|
|
ldr r9, [r3] ; load the address of the code section
|
|
ldr r8, [r4] ; load the address of the exheader
|
|
|
|
ldr r7, [r8, #0x200] ; low titleID
|
|
ldr r6, =#0x000001ff
|
|
cmp r7, r6
|
|
bne end
|
|
|
|
ldr r7, [launcher] ; offset of the dev launcher (will be replaced later)
|
|
add r7, r9
|
|
|
|
adr r5, patchesStart
|
|
add r6, r5, #(patchesEnd - patchesStart)
|
|
|
|
patchLoop:
|
|
ldrh r0, [r5, #4]
|
|
cmp r0, #0
|
|
moveq r4, r9
|
|
movne r4, r7
|
|
|
|
ldrh r2, [r5, #6]
|
|
add r1, r5, #8
|
|
ldr r0, [r5]
|
|
add r0, r4
|
|
blx memcmp
|
|
cmp r0, #0
|
|
bne skipPatch
|
|
|
|
ldrh r2, [r5, #6]
|
|
add r1, r5, #0x08
|
|
add r1, r2
|
|
ldr r0, [r5]
|
|
add r0, r4
|
|
blx memcpy
|
|
|
|
skipPatch:
|
|
|
|
ldrh r0, [r5, #6]
|
|
add r5, r5, #0x08
|
|
add r5, r0,lsl#1
|
|
cmp r5, r6
|
|
blo patchLoop
|
|
|
|
end:
|
|
|
|
pop {r0-r11, pc}
|
|
|
|
launcher: .ascii "LAUN"
|
|
|
|
.align 2
|
|
.thumb
|
|
|
|
memcmp:
|
|
push {r4-r7, lr}
|
|
mov r4, #0
|
|
cmp_loop:
|
|
cmp r4, r2
|
|
bhs cmp_loop_end
|
|
ldrb r6, [r0, r4]
|
|
ldrb r7, [r1, r4]
|
|
add r4, #1
|
|
sub r6, r7
|
|
cmp r6, #0
|
|
beq cmp_loop
|
|
|
|
cmp_loop_end:
|
|
mov r0, r6
|
|
pop {r4-r7, pc}
|
|
|
|
memcpy:
|
|
push {r4-r5, lr}
|
|
mov r4, #0
|
|
|
|
copy_loop:
|
|
cmp r4, r2
|
|
bhs copy_loop_end
|
|
ldrb r5, [r1, r4]
|
|
strb r5, [r0, r4]
|
|
add r4, #1
|
|
b copy_loop
|
|
|
|
copy_loop_end:
|
|
pop {r4-r5, pc}
|
|
|
|
.align 4
|
|
|
|
; Available space for patches: 152 bytes on N3DS, 666 on O3DS
|
|
|
|
patchesStart:
|
|
; SCFG_EXT bit31 patches, based on https://github.com/ahezard/twl_firm_patcher (credits where they're due)
|
|
|
|
.word 0x07368 ; offset
|
|
.halfword 1 ; type (0: relative to the start of TwlBg's code; 1: relative to the start of the dev SRL launcher)
|
|
.halfword 4 ; size (must be a multiple of 4)
|
|
.byte 0x94, 0x09, 0xfc, 0xed ; expected data (decrypted = 0x08, 0x60, 0x87, 0x05)
|
|
.byte 0x24, 0x09, 0xbc, 0xe9 ; patched data (decrypted = 0xb8, 0x60, 0xc7, 0x01)
|
|
|
|
.word 0xa5888
|
|
.halfword 1
|
|
.halfword 8
|
|
.byte 0x83, 0x30, 0x2e, 0xa4, 0xb0, 0xe2, 0xc2, 0xd6 ; (decrypted = 0x02, 0x01, 0x1a, 0xe3, 0x08, 0x60, 0x87, 0x05)
|
|
.byte 0x83, 0x50, 0xf2, 0xa4, 0xb0, 0xe2, 0xc2, 0xd6 ; (decrypted = 0x02, 0x61, 0xc6, 0xe3, 0x08, 0x60, 0x87, 0xe5)
|
|
|
|
patchesEnd:
|
|
|
|
.pool
|
|
|
|
.close |