init commit take 2

emunand/emuCode.s

@@ -0,0 +1,155 @@
+.nds
+
+sdmmc equ 0x80D86F0
+sdmmc_unk1 equ 0x080788C0
+aes_unk equ 0x0805F9E4
+aes_setkey equ 0x08057458
+sdmmc_unk2 equ 0x080786A0
+sdmmc_unk0 equ 0x08062890
+
+.create "emunand.bin", 0x0801A4C0
+.org 0x0801A4C0
+.arm
+patch000_00:
+	stmfd sp!, {r0-r3}
+	mov r3, r0
+	ldr r1, =orig_sector
+	ldr r2, [r3,#4]
+	str r2, [r1,#4]
+	ldr r0, =sdmmc
+	cmp r2, r0
+	ldr r2, [r3,#8]
+	str r2, [r1]
+	beq @@orig_code
+	ldr r1, =sdmmc
+	str r1, [r3,#4]
+	cmp r2, #0
+	ldr r0, =nand_offset
+	ldrne r0, [r0]
+	addne r0, r2
+	ldreq r0, [r0, #(ncsd_header_offset - nand_offset)]
+	str r0, [r3,#8]
+@@orig_code:
+	ldmfd sp!, {r0-r3}
+	movs r4, r0
+	movs r5, r1
+	movs r7, r2
+	movs r6, r3
+	movs r0, r1, lsl#23
+	beq loc_801a534
+	stmfd sp!, {r4}
+	ldr r4, =(sdmmc_unk0 + 1)
+	blx r4
+	ldmfd sp!, {r4}
+loc_801a534:
+	ldr r0, [r4,#4]
+	ldr r1, [r0]
+	ldr r1, [r1,#0x18]
+	blx r1
+	ldr r1, [r4,#4]
+	movs r3, r0
+	ldr r0, [r1,#0x20]
+	movs r2, r5, lsr#9
+	mov r12, r0
+	ldr r0, [r4,#8]
+	str r7, [sp,#4]
+	adds r0, r0, r2
+	cmp r1, #0
+	str r6, [sp,#8]
+	str r0, [sp]
+	beq loc_801a578
+	adds r1, r1, #8
+loc_801a578:
+	movs r2, r4
+	adds r2, r2, #0xc
+	mov r0, r12
+	ldr r5, =(sdmmc_unk1 + 1) ; called by the original function
+	blx r5
+	stmfd sp!, {r0-r3}
+	ldr r2, =orig_sector
+	ldr r1, [r2]
+	str r1, [r4,#8]
+	ldr r1, [r2,#4]
+	str r1, [r4,#4]
+	ldmfd sp!, {r0-r3}
+	ldmfd sp!, {r1-r7,lr}
+	bx lr
+
+patch000_01:
+	stmfd sp!, {r0-r3}
+	mov r3, r0
+	ldr r1, =orig_sector
+	ldr r2, [r3,#4]
+	str r2, [r1,#4]
+	ldr r0, =sdmmc
+	cmp r2, r0
+	ldr r2, [r3,#8]
+	str r2, [r1]
+	beq @@orig_code
+	ldr r1, =sdmmc
+	str r1, [r3,#4]
+	cmp r2, #0
+	ldr r0, =nand_offset
+	ldrne r0, [r0]
+	addne r0, r2
+	ldreq r0, [r0, #(ncsd_header_offset - nand_offset)]
+	str r0, [r3,#8]
+@@orig_code:
+	ldmfd sp!, {r0-r3}
+	movs r4, r0
+	movs r5, r1
+	movs r7, r2
+	movs r6, r3
+	movs r0, r1, lsl#23
+	beq loc_801a624
+	stmfd sp!, {r4}
+	ldr r4, =(sdmmc_unk0 + 1)
+	blx r4
+	ldmfd sp!, {r4}
+loc_801a624:
+	ldr r0, [r4,#4]
+	ldr r1, [r0]
+	ldr r1, [r1,#0x18]
+	blx r1
+	ldr r1, [r4,#4]
+	movs r3, r0
+	ldr r0, [r1,#0x20]
+	movs r2, r5, lsr#9
+	mov r12, r0
+	ldr r0, [r4,#8]
+	str r7, [sp,#4]
+	adds r0, r0, r2
+	cmp r1, #0
+	str r6, [sp,#8]
+	str r0, [sp]
+	beq loc_801a668
+	adds r1, r1, #8
+loc_801a668:
+	movs r2, r4
+	adds r2, r2, #0xC
+	mov r0, r12
+	ldr r5, =(sdmmc_unk2 + 1)
+	blx r5
+	stmfd sp!, {r0-r3}
+	ldr r2, =orig_sector
+	ldr r1, [r2]
+	str r1, [r4,#8]
+	ldr r1, [r2,#4]
+	str r1, [r4,#4]
+	ldmfd sp!, {r0-r3}
+	ldmfd sp!, {r1-r7,lr}
+	bx lr
+
+.pool
+orig_sector:		.word 0x00000000
+orig_ptr:			.word 0x00000000
+nand_offset:		.ascii "NAND"       ; for rednand this should be 1
+ncsd_header_offset:	.ascii "NCSD"       ; depends on nand manufacturer + emunand type (GW/RED)
+;ncsd_header_offset: .word 0x1D7800
+;ncsd_header_offset: .word 0x1DD000
+slot0x25keyX:
+    .word 0xABD8E7CE 
+    .word 0xAE0DC030 
+    .word 0xE3F50E85 
+    .word 0xF35AAC82
+.close