System for protecting supervisor mode data from user code

Details System for protecting supervisor mode data from user code System for protecting supervisor mode data from user code

2011-07-19

2011-07-19

Thomas, Shane M (Department: 2186)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711SE12093

Reexamination Certificate

active

07984257

ABSTRACT:
A system for protecting supervisor mode data from user code having a processor which implements a register window architecture supporting as separate window stacks for supervisor and user modes with a transition window in one of the window stacks set with at least one invalid window bit in an invalid window mask of the architecture additional to an invalid window bit set for a reserved window of the invalid window mask for transitioning from the supervisor mode to the user mode, supervisor mode-only memory storing the supervisor mode window stack, and user mode accessible memory storing the supervisor and user mode window stacks.

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