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<p>A control-flow checking method using extended-precision checksums and watchdog assists is proposed. Control-flow checking based on extended-precision checksums is shown to have low error detection latency compared to previously proposed methods. Analytical measures are derived to demonstrate the effectiveness of using extended-precision checksums for control flow checking. It is shown that the error detection latency in the extended-precision-checksum-based control-flow checking remains relatively constant for both single and multiple sequence errors. In the case of signature-based methods, error detection latency increases linearly with the number of sequence errors. A watchdog assist architecture for control-flow checking in programs which addresses several architecture issues is proposed. This watchdog assist architecture can support control-flow checking for multiprocessor, multiprogramming, and cache-based environments. The Hewlett-Packard Precision Architecture is used as an example architecture to demonstrate the feasibility of watchdog assists.</p>
analytical measures; watchdog assists; extended-precision checksums; control-flow checking method; error detection latency; signature-based methods; multiprocessor; multiprogramming; cache-based environments; Hewlett-Packard Precision Architecture; computer architecture; concurrency control; error detection; fault tolerant computing.

N. Saxena and E. McCluskey, "Control-Flow Checking Using Watchdog Assists and Extended-Precision Checksums," in IEEE Transactions on Computers, vol. 39, no. , pp. 554-559, 1990.
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