SecuLock copy-protection for GP32
(prevent to run emulators & multiple SMC ID checks)

some ideas...

- initial loader
	actual game can be loaded at 0x0C000000 + offset or something
	secumax (?) + own decryption based on SMC ID

- random code encryption
	not 100% decrypted while game is running
	write back encrypted instructions once in a while (using timers or so)
	more SMC ID reads in different functions to they have all to be patched

- install exception handler (possible with current firmware?)
	could be triggered for illegal instructions that need to be decrypted on-the-fly
	correct instruction xor-value could be retrieved from some patch-table (index could be based on current PC)
	check if it's called correctly when generating some test-exceptions
	check if exception vector is not reset
	change exception vector a few times

- tamper detection (emulator + debugger)
	CPU, memory, cache, I/O timing, timers, framerate

- anti-emulator (could be used to reverse engineer)
	MMU
	RTC/alarm initial values & behaviour

- anti-debugger
	hmm.. can detect JTAG cable?
	switch off serial, USB
	slow down CPU sometimes so tracing will be out of the question
	own exception handler

- website to make encrypted version
	could be trial-version and showing some message in the loader

- filesystem / SMC
	base ID on whole CID (given that there's more, certainly won't work on emulator:)
	invalid filenames
	bad sectors
	last sector?

- use EEPROM (4KB)
	userid[16], password[16], pduid[32]
	firmware settings[?]
	write/read test (emu check)