Rewrite the ARM9 exception handlers, ...

- Fix patchArm9ExceptionHandlersInstall for older versions

- Fix some bugs in the ARM11 exception handlers

- Other, minor, changes

source/exceptions.c

@@ -37,7 +37,7 @@
 
 void installArm9Handlers(void)
 {
-    memcpy((void *)0x01FF8000, arm9_exceptions_bin + 32, arm9_exceptions_bin_size - 32);
+    memcpy((void *)0x01FF8000, arm9_exceptions_bin, arm9_exceptions_bin_size);
 
     /* IRQHandler is at 0x08000000, but we won't handle it for some reasons
        svcHandler is at 0x08000010, but we won't handle svc either */
@@ -47,8 +47,10 @@ void installArm9Handlers(void)
     for(u32 i = 0; i < 4; i++)
     {
         *(vu32 *)(0x08000000 + offsets[i]) = 0xE51FF004;
-        *(vu32 *)(0x08000000 + offsets[i] + 4) = *((u32 *)arm9_exceptions_bin + 1 + i);
+        *(vu32 *)(0x08000000 + offsets[i] + 4) = *(vu32 *)(0x01FF8008 + 4 * i);
     }
+
+    *(vu32 *)0x01FF8004 = 0; //BreakPtr
 }
 
 void detectAndProcessExceptionDumps(void)

source/patches.c

@@ -454,7 +454,9 @@ u32 patchArm9ExceptionHandlersInstall(u8 *pos, u32 size)
 
     if(temp == NULL) return 1;
 
-    u32 *off = (u32 *)(temp - 0xA);
+    u32 *off;
+
+    for(off = (u32 *)(temp - 2); *off != 0xE5801000; off--); //Until str r1, [r0]
 
     for(u32 r0 = 0x08000000; *off != 0xE3A01040; off++) //Until mov r1, #0x40
     {
@@ -491,7 +493,15 @@ u32 patchSvcBreak9(u8 *pos, u32 size, u32 kernel9Address)
     while(*arm9SvcTable != 0) arm9SvcTable++; //Look for SVC0 (NULL)
 
     u32 *addr = (u32 *)(pos + arm9SvcTable[0x3C] - kernel9Address);
-    *addr = 0xE12FFF7F;
+
+    /*
+        mov r8, sp
+        bkpt 0xffff
+    */
+    addr[0] = 0xE1A0800D;
+    addr[1] = 0xE12FFF7F;
+
+    *(vu32 *)0x01FF8004 = arm9SvcTable[0x3C]; //BreakPtr
 
     return 0;
 }

source/start.s

@@ -27,9 +27,7 @@
 .global _start
 _start:
     @ Disable interrupts and switch to supervisor mode (also clear flags)
-    mov r4, #0x13
-    orr r4, #0x1C0
-    msr cpsr_cxsf, r4
+    msr cpsr_cxsf, #0xD3
 
     @ Check if r0-r2 are 0 (r0-sp are supposed to be 0), and for regions 0, 5 and 7 of the MPU config
     @ This is not foolproof but should work well enough