Protected function calling

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2011-08-30

2011-08-30

Kindred, Alford W (Department: 2181)

Electrical computers and digital processing systems: processing

Processing control

Instruction modification based on condition

C712S229000, C726S017000, C726S026000

Reexamination Certificate

active

08010772

ABSTRACT:
Memory address space is divided into domains and instruction access control circuitry is used to detect when the memory address from which an instruction to be executed is fetched has crossed a domain boundary and changed and in such cases to conduct a check to ensure that the instruction within the new domain is a permitted instruction of a permitted form. The permitted instruction can be arranged to be a no operation instruction other than in respect of the instruction access control circuitry, in order to assist backward compatibility.

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Office Action mailed Jun. 17, 2010 in co-pending U.S. Appl. No. 12/068,449.

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