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Memory protection unit, memory protection method, and computer-readable record medium in which memory protection program is recorded

  • US 20050144408A1
  • Filed: 12/27/2004
  • Published: 06/30/2005
  • Est. Priority Date: 12/24/2003
  • Status: Abandoned Application
First Claim
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1. A memory protection unit, comprising:

  • a memory which includes at least one memory area that is used by at least one subroutine, and in which a writing attribute is set for every memory area, the writing attribute representing a writing permission or a writing prohibition;

    a subroutine choosing means for accepting a processing request, and choosing a subroutine which executes the processing request;

    a memory-area specifying means for specifying a memory area which is used by the subroutine that is chosen by the subroutine choosing means; and

    a subroutine calling means for setting, to the writing permission, the writing attribute of the memory area which is specified by the memory-area specifying means, thereafter calling and executing the subroutine that is chosen by the subroutine choosing means, and setting, to the writing prohibition, the writing attribute of the memory area which is set to the writing permission after completing the execution of the subroutine.

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