Messages in this thread | | | Date | Thu, 11 Sep 2014 15:35:29 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH v8 07/10] x86, mpx: decode MPX instruction to get bound violation information |
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On 09/11/2014 03:32 PM, Dave Hansen wrote: > On 09/11/2014 03:18 PM, Thomas Gleixner wrote: >> On Thu, 11 Sep 2014, Qiaowei Ren wrote: >>> This patch sets bound violation fields of siginfo struct in #BR >>> exception handler by decoding the user instruction and constructing >>> the faulting pointer. >>> >>> This patch does't use the generic decoder, and implements a limited >>> special-purpose decoder to decode MPX instructions, simply because the >>> generic decoder is very heavyweight not just in terms of performance >>> but in terms of interface -- because it has to. >> >> And why is that an argument to add another special purpose decoder? > > Peter asked for it to be done this way specifically: > > https://lkml.org/lkml/2014/6/19/411 >
Specifically because marshaling the data in and out of the generic decoder was more complex than a special-purpose decoder.
-hpa
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