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Accessing private data about the state of a data processing machine from storage that is publicly accessible

  • US 9,087,000 B2
  • Filed: 03/15/2013
  • Issued: 07/21/2015
  • Est. Priority Date: 11/26/2003
  • Status: Expired due to Fees
First Claim
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1. A method for operating a data processing machine, comprising:

  • applying by a processor an encoding process to private-state data of said processor, where the private-state data captures a state of the processor;

    writing, to a location in storage, said encoded private-state data, the location being one that is accessible to software written for the processor; and

    reading by the software the encoded private-state data from the storage using an instruction that causes the processor to decode the encoded private-state data and store the decoded private-state data in a private-state area accessible to software only by using the instruction;

    wherein the private-state data refers to one of content of an internal register of the processor that is not explicitly identified in an instruction manual for the processor, and content of an internal register of the processor that is explicitly identified in the instruction manual but is stored in one of a format and a location that is not explicitly identified in the instruction manual.

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