Hardware-assisted program trace collection with selectable call-signature capture
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United States of America Patent
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Nov 17, 2015
Grant Date -
Feb 27, 2014
app pub date -
Nov 1, 2013
filing date -
Aug 22, 2011
priority date (Note) -
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Abstract
Hardware-assisted program tracing is facilitated by a processor that includes a root instruction address register, a program trace signature computation unit and a call signature register. When a program instruction having an address matching the root instruction address register is executed, a program trace signature is captured in the call signature register and capture of branch history is commenced. By accumulating different values of the call signature register, for example in response to an interrupt generated when the root instruction is executed, software that performs program tracing can obtain signatures of all of the multiple execution paths that lead to the root instruction, which is also specified by software in order to set different root instructions for program tracing. In an alternative implementation, a storage for multiple call signatures is provided in the processor and read at once by the software.
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