Merge pull request #317 from SciresM/master

Add signature patches for old firmwares.

source/firm.c

@@ -294,6 +294,8 @@ u32 patch1x2xNativeAndSafeFirm(u32 devMode)
         ret = 0;
 
     ret += ISN3DS ? patchFirmWrites(process9Offset, process9Size) : patchOldFirmWrites(process9Offset, process9Size);
+    
+    ret += patchOldSignatureChecks(process9Offset, process9Size);
 
     if(devMode != 0)
     {

source/patches.c

@@ -118,6 +118,28 @@ u32 patchSignatureChecks(u8 *pos, u32 size)
     return 0;
 }
 
+u32 patchOldSignatureChecks(u8 *pos, u32 size)
+{
+    // Look for signature checks
+    // Pattern 2 works for 1.x, 2.x + factory FIRM.
+    // For patchSignatureChecks-style (temp - 1 instead of temp - 3):
+    // 1.x+2.x: pattern2[] = {0xB5, 0x23, 0x4E, 0x0C};
+    // factory: pattern2[] = {0xB5, 0x16, 0x4E, 0x0C};
+    const u8 pattern[] = {0xC0, 0x1C, 0xBD, 0xE7},
+             pattern2[] = {0x4E, 0x0C, 0x00, 0x71, 0x68};
+
+    u16 *off = (u16 *)memsearch(pos, pattern, size, sizeof(pattern));
+    u8 *temp = memsearch(pos, pattern2, size, sizeof(pattern2));
+
+    if(off == NULL || temp == NULL) return 1;
+
+    u16 *off2 = (u16 *)(temp - 3);
+    *off = off2[0] = 0x2000;
+    off2[1] = 0x4770;
+
+    return 0;
+}
+
 u32 patchFirmlaunches(u8 *pos, u32 size, u32 process9MemAddr)
 {
     //Look for firmlaunch code

source/patches.h

@@ -37,6 +37,7 @@ extern CfgData configData;
 u8 *getProcess9Info(u8 *pos, u32 size, u32 *process9Size, u32 *process9MemAddr);
 u32 *getKernel11Info(u8 *pos, u32 size, u32 *baseK11VA, u8 **freeK11Space, u32 **arm11SvcHandler, u32 **arm11DAbtHandler, u32 **arm11ExceptionsPage);
 u32 patchSignatureChecks(u8 *pos, u32 size);
+u32 patchOldSignatureChecks(u8 *pos, u32 size);
 u32 patchFirmlaunches(u8 *pos, u32 size, u32 process9MemAddr);
 u32 patchFirmWrites(u8 *pos, u32 size);
 u32 patchOldFirmWrites(u8 *pos, u32 size);