Boots – shoes – and leggings
Patent
1994-12-19
1998-06-09
Beausoliel, Jr., Robert W.
Boots, shoes, and leggings
395377, 364264, 3642672, 3642676, G06F 1100
Patent
active
057648859
ABSTRACT:
A data flow of a processor is traced while accessing data stored in a memory and in a plurality of registers during operation of the processor. The tracing involves detecting an unpredictable accessing of data on the assumption that a predictable accessing can be reconstructed without any further input. The unpredictable accessing is identified by setting and clearing a trace bit associated with each of the registers according to identifying the accessing as direct memory-to-register, register-to-register, constant-to-register, and indirect memory. If a trace bit is set on a register storing data being used as a base address during the indirect memory acceding, data flow control information, such as the base address stored in the register being used during the indirect acceding is recorded in a queue, and from the queue the information can be stored in a trace buffer. During reconstruction of the operation, the trace buffer, and a copy of the data having an initial state can be examined to analyze the data flows during the real-time operation of the processor.
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Conroy David G.
Perl Sharon E.
Sites Richard L.
Uhler G. Michael
Anderson Thomas E.
Beausoliel, Jr. Robert W.
Brinkman Dirk
Digital Equipment Corporation
Le Dieu-Minh
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