| 摘要 |
PURPOSE:To make the correction of an operating system unnecessary when a support program is enhanced by providing a prescribed privileged subprogram and non-privileged subprogram respectively in the support program. CONSTITUTION:The support program 3 is started up with a non-privileged level to support the development or the maintenance, etc., of the operating system 2. In the program 3, the non-privileged subprogram 3A including a privileged subprogram call instruction 3A-1 to call the privileged subprogram 3B, is built in. Also, in the program 3, the privileged subprogram 3B including a non-privileged subprogram return instruction 3B-1 to return to the non- privileged subprogram 3A, is built in. In this way, it is possible to make the correction of the operating system unnecessary. |
