System and method for tracing instructions in an information handling system without changing the system source code
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Nov 10, 1997
filing date -
Nov 10, 1997
priority date (Note) -
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Abstract
The present invention is directed to a system and method for tracing operations in an information handling system without changing the operating system code. Certain machine registers are shadowed during critical machine state transitions (e.g., taking and returning from interrupts), so that the tracing program does not lose control of the system. The system is interrupted before each instruction is executed, and a tracing program determines if a change in program flow has occurred. If a change in program flow has occured, a record is written to a trace log. The record contains the number of consecutive instructions executed before the program flow change, along with a displacement field indicating the number of bytes from the end of the record to the beginning of the next record. Executed instructions are also embedded in the trace log, allowing for high compression ratios and less complex post-processing of the trace data.
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