System using both a supervisor level control bit and a user leve

Details System using both a supervisor level control bit and a user leve System using both a supervisor level control bit and a user leve

1992-06-10

1993-04-06

Lee, Thomas C.

Boots, shoes, and leggings

395400, 395425, 364DIG1, 3642653, 3642597, 36494492, 3649455, 3649457, 364DIG2, 3649474, G06F 1130

Patent

active

052010430

ABSTRACT:
A microprocessor which includes means for detecting misaligned data reference is described. The detecting means is selectable such that when it is enabled and reference is made to a misaligned data object, a fault is produced which interrupts the currently executing program. The detecting means comprises two mode bits stored within the microprocessor. The first mode bit provides control of the fault at the least privileged level of execution (i.e., the applications level) while the second mode bit provides control of the fault at the most privileged level (i.e., the operating system level). Both mode bits must be set to "1" in order for the detecting means to be enabled. The use of two separate mode bits for optionally enabling alignment checking provides optimum programming flexibility.

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