Tracing technique for application programs using protect mode ad

Details Tracing technique for application programs using protect mode ad Tracing technique for application programs using protect mode ad

1993-12-08

1997-12-23

Kriess, Kevin A.

395681, 395651, 395413, G06F 1130

Patent

active

057014868

ABSTRACT:
A tracing technique is disclosed for an application program that is only permitted to access virtual storage, not physical storage, via a Protect Mode Addressing scheme. The application program contains an initialization statement that initializes a trace address T1 to be equal to a virtual address V1 contained in a data area under the control of the application program. A statement in the application program then requests a pinned virtual address V2 that maps to a predetermined physical address P from a device driver. If the device driver exists, the trace address T1=virtual address V2. A memory mapper maps address V2 to physical address P and writes the information to physical address P. A conventional logic analyzer monitors the bus for any writes to physical address P and captures the contents of the bus upon the detection of this condition.

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