自修改代码在Godson-X上的处理实现  

Self-modifying Code Implementation on Godson-X

作　　者：张浩[1] 钱学海[1] 

机构地区：[1]中国科学院计算技术研究所,北京100080

出　　处：《计算机工程》2008年第3期102-104,共3页Computer Engineering

摘　　要：主流处理器中采用的超标量流水线机制及高速缓存使得SMC操作需要特殊处理。该文基于对多种程序的SMC行为的分析和多种SMC冲突的解决方案的对比,设计了一种灵活高效的SMC解决方法。该方法对结构的复杂度及主流水线的性能的影响小,目前已被应用在支持CISC指令集的Godsonx处理器模型上。The act of a processor writing data into a currently executing code segment with the intent of executing that data as code is called self-modifying code. As processor architectures become more complex and start to speculatively execute code ahead of the retirement point, the rules regarding which code should execute, pre- or post-modification, become blurred. Although SMC seldom happens in current normal applications, it is necessary to handle this situation for programs with SMC. This paper analyses several methods for SMC handling, and gives a facile method that can be easily implemented. This method has been implemented on Godson-X processor model.

关 键 词：自修改代码 超标量流水线 指令高速缓存 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]