TEE-Watchdog: Mitigating Unauthorized Activities within Trusted Execution Environments in ARM-Based Low-Power IoT Devices

Table 2

Register bits of MMFSR and their function.

Bits	Bit name	Bit function
[0]	IACCVIOL	1 = the processor attempted an instruction fetch from a location that does not permit execution
[1]	DACCVIOL	1 = the processor attempted a load or store at a location that does not permit the operation
[3]	MUNSTKERR	1 = unstack for an exception return has caused one or more access violations
[4]	MSTKERR	1 = stacking for an exception entry has caused one or more access violations
[7]	MMARVALID	1 = MMAR holds a valid fault address