Function modification in a write-protected operating system
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United States of America Patent
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Apr 6, 2004
Grant Date -
N/A
app pub date -
Mar 8, 2000
filing date -
Mar 8, 2000
priority date (Note) -
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Abstract
An apparatus and method are disclosed for runtime modification of called functions within a write-protected operating system. The access state of a processor is altered to allow modification of the function code, and a redirection to a hook function is inserted at a target entry point within the called function. The access state of the processor may then be restored, and the hook function is executed in place of or in conjunction with the called function.
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