基于JTAG的故障注入工具设计

Design of Fault Injection Tool Based on JTAG

针对软件模拟硬件故障注入不能突破操作系统保护而使故障注入受到限制的问题,提出一种基于JTAG调试技术的硬件故障注入方法。当目标系统处于运行状态时,通过设置断点、设置观察点、发送调试请求等方式使目标系统在硬件层次中止当前运行模式,进入硬件调试模式。通过对基于总线扫描链的移位操作插入数据或CPU本身的指令,对系统内部的总线数据、寄存器数据、存储器数据进行修改。实验结果表明,该方法可以成功地实现故障注入。

Software simulated hardware fault injection can not break through protection of operating system,leaving the fault injection to be limited.This paper presents a hardware fault injection method based on JTAG debugging techniques.By setting break points,setting watch points or sending debugging request to the target system when it is running,the target system can be turned to hardware debugging mode.By shifting bus based scan chain or adding instructions to pipe to change bus data,register data or memory data,fault injection can make effort.Experimental results show that the method can realize fault injection successfully.