| 摘要 |
PURPOSE:To detect misprogramming by storing a pass word and the length of a prescribed area corresponding to the value of a base register in the prescribed area, and at the execution of a memory updating instruction, checking the pass word and the address range. CONSTITUTION:In a main storage device 1, a base register indicating the base address of a certain area 11 assigned to a certain program is defined as the 4th location (R4) e.g. of a general register. A pass word to use the area and the length information indicating the size of the area are stored in an address having specific relation to the base address. Namely, the length 13 is stored in the address of the base address 4 and the pass word 12 is stored in the address of the base register 8. Consequently, the misspecification of the base register or the specification of a displacement address exceeding an assigned area can be checked. |
