On 2014-10-24, Thomas Gleixner wrote: > On Sun, 12 Oct 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. > > My question still stands why using the existing decoder is an issue. > Performance is a complete non issue in case of a bounds violation and > the interface argument is just silly, really. > As hpa said, we only need to decode several mpx instructions including BNDCL/BNDCU, and general decoder looks like a little heavy. Peter, what do you think about it? Thanks, Qiaowei
