Microprocessor stack built-in guards
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United States of America Patent
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Jun 22, 1993
Grant Date -
N/A
app pub date -
Nov 16, 1989
filing date -
Nov 16, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is a method for a microprocessor such that when a call is made to a subroutine or an interrupt, a return address is stored in a 'stack' memory (RAM) and also that a particular piece of hardware write the return address to an additional register (latches) within the microprocessor. The method enables a comparison to be made at the end of the subroutine or interrupt such that the address to which the subroutine tries to return is compared to the address as latched into the hardware portion of the microprocessor to detect whether any human error has occurred in the programming of the interrupt program or the subroutine.
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