Processor fault injection method oriented to BIT software test and simulator thereof

Abstract

The invention provides a processor fault injection method oriented to a BIT (Built-In Test) software test and a simulator thereof, wherein a hardware circuit board that runs BIT software is taken as a simulation object of the simulator. A normal function simulation module, a fault model parsing module, a fault injection module, a failure behavior simulation module and a peripheral crosslinking environment emulation module are additionally arranged in the processor fault injection method, wherein the normal function simulation module simulates the normal functions of a processor, memorizer and the like; the fault model parsing module parses a fault sequence file; and the fault injection module matches and injects a fault. The processor fault injection method compiles and parses an XML (Extensive Markup Language) fault sequence file to form the fault sequence that can be identified by the simulator by building a fault mode library, searches and injects the corresponding fault when the simulator encounters a fault observation point during the simulation process, and performs the fault simulation when the fault is triggered. The processor fault injection method and the simulator can achieve more complete types of the injected fault modes, can fully cover test cases under each failure occurrence, and can test the circuit board-level BIT software more sufficiently; in addition, only the BIT software that is tested fully can ensure the accuracy and the timeliness of BIT prediction of aeronautical airborne equipment, and further ensures the reliability and the safety of a system.

Description

technical field [0001] The invention relates to a fault injection technology in reliability engineering and a processor technology in computer engineering, in particular to a processor fault injection method for BIT software testing and a simulator thereof. Background technique [0002] No matter how high the reliability of a system, equipment or product is, it cannot guarantee that it will always work normally. Users and maintainers must monitor its health status and know whether there is a fault or where a fault has occurred, so it must be monitored and tested. . Therefore, it is hoped that the system and equipment itself can provide convenience for this purpose. The characteristics of this kind of system and equipment that are convenient for monitoring their health status and easy for fault diagnosis and testing are the testability of the system and equipment. Testability refers to a design characteristic of a product that can promptly and accurately determine its state ...

AI Technical Summary

Problems solved by technology

[0005] However, traditional fault injection technology faces many problems: Although hardware-based fault injection technology injects real hardware faults, it is limited by the high density of components on the circuit board, and there is not enough space for additional hardware fault injection equipment such as probes and sockets. , and the internal faults of the more concerned components cannot be injected; software-based fault injection technology has various benefits in other applications, but the code of BIT software is not open (or not allowed to be modified), the operating structure is complex, and the accessibility is poor , so software fault injection has nowhere to start in BIT software testing; finally, although the fault injection technology based on simulation / simulation implemented by hardware description languages ​​such as VHDL and Verilog can accurately simulate the hardware environment in which BIT software runs, it cannot support BIT software runs on it, and it is impossible to talk about it as a software testing tool

In terms of dynamic testing, limited by professional knowledge, environmental technical conditions, etc., there are two problems: (1) In the design of test cases, there is a lack of comprehensive analysis of electronic equipment systems, and the design of abnormal use cases is not comprehensive enough; ( 2) Considering the abnormal use cases designed by BIT software to detect failure modes, but due to the functional characteristics of BIT software itself, the application of some abnormal use cases needs to inject faults into the actual hardware to realize

However, the hardware fault injection method cannot be applied to high-density electronic equipment

In this way, many use cases cannot be executed even if they are designed

These reasons lead to insufficient BIT software testing, so that many problems are only discovered in the actual use process, causing serious consequences

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