In circuit emulator(ICE) that flags events occuring in system ma

Details In circuit emulator(ICE) that flags events occuring in system ma In circuit emulator(ICE) that flags events occuring in system ma

1993-09-30

1995-02-21

Eng, David Y.

Boots, shoes, and leggings

395800, 3642608, G06F 1210, G06F 124, G06F 126

Patent

active

053924207

ABSTRACT:
A micro processor emulator in which an SMM flag is set whenever a processor being emulated enters system management mode (SMM) mode, a diminished power mode, and is reset when the processor leaves SMM mode. Events, such as branch instructions, that are recorded in a trace memory while the processor is in SMM mode (when the SMM flag is set) are recorded as a trace frame comprised of a trace word and an associated in system management mode (IN.sub.-- SMM) trace bit. When a user evokes interrogation mode of the emulator, the IN.sub.-- SMM trace bit is used to calculate correct physical addresses for disassembly of the recorded trace information.

REFERENCES:
patent: 3629855 (1971-12-01), Conley
patent: 4281380 (1981-07-01), De Mesa
patent: 4924466 (1990-05-01), Gregor
patent: 5170109 (1992-12-01), Yanagita
patent: 5181204 (1993-01-01), Kasman
patent: 5249284 (1993-09-01), Kass
patent: 5263170 (1993-11-01), Kato

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