| 摘要 |
An illegal use of a privileged instruction and a library function by an application process is prevented. A concept of“security gate”is provided, and an instruction is located at a head of the library function in a high-reliability memory area which is not easy changed such as a ROM, to request a security gate entry to an OS. An instruction is located at the last of the library function to request a security gate exit to the OS. The security level is changed to a higher level and a privileged instruction is allowed to be executed, only when the application process in a security gate entry state.
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