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

2008-12-29

2011-10-11

Wilson, Yolanda L (Department: 2113)

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

C712S227000, C717S128000

Reexamination Certificate

active

08037363

ABSTRACT:
A data processing apparatus and method for generating trace elements is provided. The data processing apparatus comprises a device for performing a sequence of operations including memory operations on data values having associated data addresses. For at least some of the memory operations the data address is determined relative to an architectural state value of an item of architectural state of the device. Trace logic is provided for receiving indications of the sequence of operations being performed by the device, and for generating from the indications a stream of trace elements. When for a memory operation the data address is determined to have been determined relative to an architectural state value of the item of the architectural state, the trace logic is operable dependent on that item of architectural state to omit at least one of a data address indication and a data value indication from the stream of trace elements generated in respect of that memory operation. A trace analysing apparatus can then be provided to reconstruct such omitted information based on a tracked architectural state value of the relevant item of architectural state.

REFERENCES:
patent: 6507921 (2003-01-01), Buser et al.
patent: 2004/0030962 (2004-02-01), Swaine et al.

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