Access monitor and access monitoring method

摘要

An access violation of the program is monitored by the access monitor (1) which is a hardware. The access monitor (1) acquires a signal input from the CPU (2) to a memory. The access monitor (1) includes an access permission table (112) as information of the memory region (3) to be permitted to each program, and detects the access violation of the signal from the CPU (2) by referring thereto. In this manner, the unjust access is monitored by the hardware, thereby preventing the unjust access by rewriting in software. <IMAGE>