| 摘要 |
PURPOSE: A method for tracing the memory change on a multitask system is provided to trace the abnormal memory change through a memory protecting function of an MMU(Memory Management Unit) by setting a memory change trace function with use of a memory address and a data value stored in the address when the data value of the memory address is abnormally changed in the multitask system. CONSTITUTION: In case that the data value stored in the memory address is changed by the unauthorized task execution, the memory change trace function is set by using the memory address and the data value stored in the address(S32). In the case that the task execution having the set memory address and the data value is detected from the MMU, the task information and the task work information are stored in a register(S34). The abnormal memory change trace information including the task information and the task work information stored in the register are informed to a system operator(S35).
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