Call instruction, return instruction and trap procedure for ring

Details Call instruction, return instruction and trap procedure for ring Call instruction, return instruction and trap procedure for ring

1986-12-19

1989-09-12

Williams, Jr., Archie E.

Boots, shoes, and leggings

3642563, 3642282, 364230, 3642301, 3642304, 3642321, G06F 1200, G06F 1202, G06F 1208, G06F 1214

Patent

active

048665991

ABSTRACT:
In combination with a multiprocessing and multiprogramming computer system having a ring protection mechanism for protecting computer programs from unauthorized access, a new architecture for the execution of the call instruction, the return instruction, and the trap procedure is implemented partly in firmware and partly in hardware. The architecture includes a new stack mechanism for storing hardware managed control information in a control frame and software controlled data in a data frame.

REFERENCES:
patent: 3916385 (1975-10-01), Parmar et al.
patent: 4104718 (1978-08-01), Poublan et al.
patent: 4177510 (1979-12-01), Appell et al.
patent: 4297743 (1981-10-01), Appell et al.
patent: 4524416 (1985-06-01), Stanley et al.

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