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Method and apparatus for determining internal status of a processor using simulation guided by acquired data
| Details |
Inventors: Tallman, James L.;
Assignee: Tektronix, Inc. (Beaverton, OR)
Primary Examiner: Lee; Thomas C.
Assistant Examiner: Coleman; Eric
Attorney, Agent or Firm: Jones; Allston L., Griffith; Boulden G., Gray; Francis I.
A method and apparatus for determining the internal state of a processor without disturbing the operational environment of the processor employs a two phase process. In the first phase, external signals produced by the processor in the execution of a known program are monitored and recorded for subsequent analysis. In the second phase, the recorded information is analyzed in the light of the known characteristic of the processor, the program it was executing, and the signals recorded during the first phase. The internal state of the processor is thereby determined after the execution of each instruction. In addition, provisions are made for the specification of breakpoints, and the examination of simulated status of the processor on the occurrence of the breakpoints. |
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DETAILED DESCRIPTION In accordance with the present invention, a method and apparatus are disclosed which provide for determining conditions internal to a processor without disturbing the operational environment associated therewith.
Broadly stated, processor devices are deterministic in nature.
In particular, by knowing the characteristics associated with a particular processor, the parameters associated with a processor starting state, and the operations which the processor is to perform, a subsequent processor state may be determined.
More specifically, a processor has a defined internal architecture, e.
g.
, set of registers with defined relationships between the various registers of the processor.
In addition, a processor has associated therewith a set of instructions for the manipulation of the operations of the processor, e.
g.
, moving information among the various registers and a memory associated with the processor.
In further addition, a processor necessarily has associated therewith a set of signals the generation of which is determined by the particular operations occurring internal to the processor.
As each of the foregoing are well defined, the internal state of a processor resulting from the performance of a known set of instructions may be determined.
In accordance with the broader aspects of the present invention, the internal state of a processor may be determined by a two phase process.
Broadly stated, the first phase may be considered as a data collection process, and the second phase may be considered as a data analysis process.
In particular, the first phase consists of monitoring the activities of a processor in the execution of a known set of instructions.
The second phase consists of employing the information obtained from the monitored activities along with other known information associated with the processor to determine the internal state of the processor.
In accordance with the present invention, during the first phase, hereinafter referred to as Phase One, the program which the processor is to execute is first developed, and is thereafter supplied to the memory device associated with the processor
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Image Analysis 
