On Thu, Feb 23, 2017 at 08:12:32AM -0600, Josh Poimboeuf wrote: > On Thu, Feb 23, 2017 at 02:28:13PM +0100, Peter Zijlstra wrote: > > +/* > > + * Only UD2 is defined in the Intel SDM and AMD64 docs, > > + * but the interweb provided UD0 and UD1: > > + * > > + * https://groups.google.com/forum/#!topic/alt.os.assembly/_rS4L0fnqGE > > FYI, the latest Intel SDM does have UD0 and UD1.
Ooh, shiny, a new one. > > + * Since various instruction decoders disagree on the length of UD1, > > + * we cannot use it either. So use UD0 for WARN. > > It shows up as "(bad)" in objtool and gdb, though it still gets the > length right: > > 8b9: 0f ff (bad) > > It would be nice if the tools knew about it... Now that the SDM lists them, I suppose that's going to be any day now :-)
