Slightly improved the reboot patch, added emuNAND patch improvements …

…from CakesFW, made the emuNAND patch completely version-independent

Should work as-is with future firmwares!

emunand/emuCode.s

@@ -1,9 +1,6 @@
-.nds
+.arm.little
 
-sdmmc equ 0x434D4453	;dummy
-
-.create "emunand.bin", 0x0801A5C0
-.org 0x0801A5C0
+.create "emunand.bin", 0
 .arm
 nand_sd:
     ; Original code that still needs to be executed.
@@ -15,20 +12,18 @@ nand_sd:
 
     ; If we're already trying to access the SD, return.
     ldr r2, [r0, #4]
-    ldr r1, =sdmmc
+    ldr r1, [sdmmc]
     cmp r2, r1
     beq nand_sd_ret
 
     str r1, [r0, #4]  ; Set object to be SD
     ldr r2, [r0, #8]  ; Get sector to read
     cmp r2, #0  ; For GW compatibility, see if we're trying to read the ncsd header (sector 0)
 
-    ldr r3, =nand_offset
-    ldr r3, [r3]
+    ldr r3, [nand_offset]
     add r2, r3  ; Add the offset to the NAND in the SD.
 
-    ldreq r3, =ncsd_header_offset
-    ldreq r3, [r3]
+    ldreq r3, [ncsd_header_offset]
     addeq r2, r3  ; If we're reading the ncsd header, add the offset of that sector.
 
     str r2, [r0, #8]  ; Store sector to read
@@ -45,6 +40,7 @@ nand_sd:
         add r0, #4
         bx r0
 .pool
+sdmmc:	                .ascii "SDMC"
 nand_offset:		.ascii "NAND"       ; for rednand this should be 1
 ncsd_header_offset:	.ascii "NCSD"       ; depends on nand manufacturer + emunand type (GW/RED)
 .close

reboot/rebootCode.s

@@ -1,12 +1,11 @@
-.nds
-.create "reboot.bin", 0
+.arm.little
 
 byteswritten equ 0x2000E000
-externalFirm equ 0x2000A000
 kernelCode equ 0x080F0000
 buffer equ 0x24000000
 fileOpen equ 0x4E45504F ;dummy
 
+.create "reboot.bin", 0
 .arm
 //Code jumps here right after the sprintf call
 process9Reboot:
@@ -34,18 +33,16 @@ process9Reboot:
 		ldreq r1, =(FileName - OpenFirm - 12)
 		addeq r1, pc
 		addne r1, sp, #0x3A8-0x70
-		ldr r0, =externalFirm
 		moveq r2, #1
 		movne r2, #0
-		str r2, [r0]
+		str r2, [externalFirm]
 		mov r2, #1
 		add r0, r7, #8
 		ldr r6, =fileOpen
 		blx r6
 
     SeekFirm:
-		ldr r0, =externalFirm
-		ldr r0, [r0]
+		ldr r0, [externalFirm]
 		cmp r0, #1
 		moveq r0, r7
         ldreq r1, =byteswritten
@@ -97,11 +94,14 @@ Memcpy:
 		LDMFD   SP!, {R0-R4}
 		MOV     LR, R12
 		BX      LR
-	
+
 FileName:
 	.dcw "sdmc:/aurei/patched_firmware_sys.bin"
 	.word 0x0
 
+externalFirm:
+	.word 0x2000A000
+
 .pool
 
 // Kernel Code

source/emunand.c

@@ -62,4 +62,12 @@ void getMPU(void *pos, u32 *off, u32 size){
     const unsigned char pattern[] = {0x03, 0x00, 0x24, 0x00};
 
     *off = (u32)memsearch(pos, pattern, size, 4);
+}
+
+void getEmuCode(void *pos, u32 *off, u32 size){
+    u8 *proc9 = (u8 *)memsearch(pos, "ess9", size, 4);
+    const unsigned char pattern[] = {0x00, 0xFF, 0xFF, 0xFF};
+
+    //Looking for the last spot before Process9
+    *off = (u32)memsearch(pos, pattern, size - (size - (u32)(proc9 - (u8 *)pos)), 4) + 0xD;
 }

source/emunand.h

@@ -13,4 +13,5 @@
 void getEmunandSect(u32 *off, u32 *head, u32 emuNAND);
 void getSDMMC(void *pos, u32 *off, u32 size);
 void getEmuRW(void *pos, u32 size, u32 *readOff, u32 *writeOff);
-void getMPU(void *pos, u32 *off, u32 size);
+void getMPU(void *pos, u32 *off, u32 size);
+void getEmuCode(void *pos, u32 *off, u32 size);

source/firm.c

@@ -150,10 +150,7 @@ static u32 loadEmu(void){
     const char path[] = "/aurei/emunand/emunand.bin";
     u32 size = fileSize(path);
     if(!size) return 0;
-    if(!console || !mode) nandRedir[5] = 0xA4;
-    //Find offset for emuNAND code from the offset in nandRedir
-    emuCodeOffset = *(u32 *)(nandRedir + 4) - (u32)section[2].address +
-                    section[2].offset + (u32)firmLocation;
+    getEmuCode(firmLocation, &emuCodeOffset, firmSize);
     fileRead((u8 *)emuCodeOffset, path, size);
 
     //Find and patch emunand related offsets
@@ -171,11 +168,9 @@ static u32 loadEmu(void){
     //No emuNAND detected
     if(!*pos_header) return 0;
 
-    //Patch emuNAND code in memory for O3DS and 9.0 N3DS
-    if(!console || !mode){
-        void *pos_instr = memsearch((void *)emuCodeOffset, "\xA6\x01\x08\x30", size, 4);
-        memcpy(pos_instr, emuInstr, sizeof(emuInstr));
-    }
+    //Calculate offset for the hooks
+    *(u32 *)(nandRedir + 4) = emuCodeOffset - (u32)firmLocation -
+                              section[2].offset + (u32)section[2].address;
 
     //Add emunand hooks
     memcpy((void *)emuRead, nandRedir, sizeof(nandRedir));

source/patches.c

@@ -17,7 +17,8 @@ const u8 mpu[0x2C] = {    //MPU shit
     0x01, 0x01, 0x01, 0x01, 0x03, 0x06, 0x1C, 0x00, 0x00, 0x00, 0x02, 0x08
     };
 
-u8 nandRedir[0x08] = {0x00, 0x4C, 0xA0, 0x47, 0xC0, 0xA5, 0x01, 0x08};    //Branch to emunand function
+//Branch to emunand function. To be filled in
+u8 nandRedir[0x08] = {0x00, 0x4C, 0xA0, 0x47, 0x00, 0x00, 0x00, 0x00};
 
 const u8 sigPat1[2] = {0x00, 0x20};
 const u8 sigPat2[4] = {0x00, 0x20, 0x70, 0x47};