double fault exception

王朝other·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

怪问题,在任务中放一个

xorl %ebx,%ebx

divl %ebx

在异常处理中同样放一个居然不发生双重故障!!!???

幸好有网络,在intel的站点上找到答案:

"Problem: In some cases a double fault exception is not generated when it

should have been because the internal double fault counter does not correctly

get incremented...

"Implication: The processor could incorrectly service a second contributory

fault instead of going to the double fault handler. The resulting system

behavior will be operating system dependant. Additionally, an inconsistent

EIP may be pushed on the stack.

"Robust operating systems should be immune to this erratum because their

exception handlers are designed such that they do not generate additional

contributory exceptions. This erratum is only of concern during the

operating system development and debug.

"Workaround: Use contributory exception handlers that do not generate

additional contributory exceptions...

"Status: No fix."

 
 
 
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