Rewrite the ARM9 exception handlers, ...

- Fix patchArm9ExceptionHandlersInstall for older versions

- Fix some bugs in the ARM11 exception handlers

- Other, minor, changes

k11_extension/source/fatalExceptionHandlers.s

@@ -159,7 +159,7 @@ _commonHandler:
 
     _no_L2C:
 
-    cps #0x1F
+    msr cpsr_cxsf, #0xdf         @ finally, switch to system mode, mask interrupts and clear flags (in case of double faults)
     ldr sp, =exceptionStackTop
     ldr sp, [sp]
     sub sp, #0x100
@@ -221,7 +221,8 @@ prefetchAbortHandler:
     pop {r8-r11}
     ldr lr, [sp, #8]!
     ldr sp, [sp, #4]
-    msr spsr, sp
+    msr spsr_cxsf, sp
+    tst sp, #0x20
     addne lr, #2                        @ adjust address for later
 
     GEN_USUAL_HANDLER _prefetchAbortNormal, 2, 12