Apparatus and method for detecting a runaway firmware control un

Details Apparatus and method for detecting a runaway firmware control un Apparatus and method for detecting a runaway firmware control un

1990-10-05

1993-09-07

Beausoliel, Jr., Robert W.

Excavating

371 511, G11C 2900, G06F 1110

Patent

active

052436012

ABSTRACT:
A method and apparatus pertaining to a firmware control unit for detecting when such control unit is not behaving properly. The control unit is organized to include in each location of the unit's control store, to which control is not expected to transfer, a predetermined type of pattern containing an address specifying the address of that location, a suitable tag identifying the probable reason for the unexplained jump, and a transfer of control to the appropriate entry point in a reporting firmware routine within the control store. The reporting firmware routine has a number of entry points for collecting all the executions of unexpected locations and for storing the appropriate address and tag information in a predetermined register file for later referencing by an unusual event (UEV) handler routine.

REFERENCES:
patent: 3815103 (1974-06-01), Holtey et al.
patent: 3831148 (1974-08-01), Greenwald et al.
patent: 4019033 (1977-04-01), Parmet
patent: 4108360 (1978-08-01), Beismann et al.
patent: 4641305 (1987-02-01), Joyce et al.

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