Data processing system for resuming instruction execution after

Details Data processing system for resuming instruction execution after Data processing system for resuming instruction execution after

1993-11-15

1995-12-12

Lim, Krisna

Boots, shoes, and leggings

364DIG1, 3642632, 3642599, 3642851, 3642852, G06F 9445, G06F 946

Patent

active

054758220

ABSTRACT:
The data processing system(10) implements a resumable instruction using two instruction bytes. When a program counter (72) points to a first instruction byte, a first data processing operation is initiated. If an interrupt occurs during execution of the first data processing operation, intermediate data calculations held in a plurality of temporary registers (64, 66, 68) are saved in stack memory at a location pointed to by the stack pointer register (72). The program counter is incremented to point to a second byte of the instruction. An instruction resume operation is executed and the intermediate results of the data processing operation are accessed from the stack memory and restored to respective storage locations within the data processing system. After the intermediate results are restored, the program counter is decremented to point to the first instruction byte and the instruction continues executing the data processing operation as though no interrupt occurred.

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