Auxiliary memory for microprocessor stack overflow
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United States of America Patent
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-
Sep 20, 1983
Grant Date -
N/A
app pub date -
Dec 17, 1980
filing date -
Dec 17, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A microprocessor system that provides protection against memory violations by interrupting the central processing unit (CPU). A problem arises when the interrupt itself causes memory violations in push-down stack operations. This problem is solved by providing an auxiliary memory to store stack overflow data. Memory violations are detected (30, 40) and overflow data is written (42, 60, 33, 100) into auxiliary memory, at sequential locations (50, 51, 60). An interrupt signal is returned (30, 20) to the CPU. A stack overflow interrupt program reads the number of locations written (50, 80, 90), and accesses the auxiliary memory (100, 60, 70, 90) to determine and correct the cause of the overflow.
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