Generation of trace elements within a data processing apparatus

Details Generation of trace elements within a data processing apparatus Generation of trace elements within a data processing apparatus

2007-03-27

2007-03-27

Beausoliel, Robert (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C714S030000, C717S128000, C717S129000, C712S227000

Reexamination Certificate

active

10452904

ABSTRACT:
A trace module traces changes in a subset of architectural state of a data processing apparatus. A trace generation unit receives input signals from components of the data processing apparatus indicative of a change in the subset of architectural state and generates a number of trace elements indicative of the change to enable a recipient of the trace elements to subsequently reconstruct the subset of architectural state. A table maintained by the trace generation unit identifies an architectural state derivable from previously generated trace elements. The trace generation unit references the table to determine which trace elements to generate. The table reduces the number of trace elements that need to be generated by providing a record of the architectural state which has already been provided to the recipient. Only those trace elements relating to changes in architectural state which are not derivable by the recipient need be generated.

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