Selective emulation interpretation using transformed instructions
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United States of America Patent
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Apr 20, 1999
Grant Date -
N/A
app pub date -
Dec 31, 1996
filing date -
Dec 31, 1996
priority date (Note) -
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Abstract
A system and method for providing high speed emulation of a computer system by transforming selected target instructions and bypassing target instruction decoding for those target instructions which have been transformed. A target computer system, controlled by a plurality of target instructions, is emulated on an emulation host computing system. Target instructions are successively loaded into the emulation host computing system in the order that the target instructions would be executed. The target instructions are decoded to identify the functions designated by the target instructions, and these functions are executed by the emulation host computing system. Emulation information is assigned to selected target instructions, where the emulation information controls execution of these selected target instructions, referred to as transformed instructions. Software routines identified by the emulation information are initiated for these transformed instructions, where the software routines execute the functions of the target instruction in the machine language of the emulation host computing system.
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