On Wed, 10 Oct 2018 13:33:30 -0500 Josh Poimboeuf <jpoim...@redhat.com> wrote:
> Re-reading your suggestion, I may have misunderstood what you're > suggesting here, but I'm thinking about doing something like what you > proposed earlier: > > GLOBAL(tramp) > jmp *current_func(%rip) > ENDPROC(tramp) > > That is, doing an indirect jump instead of the above direct jump, so > that any previous references to the trampoline would still work (and it > would also work during early boot). > > Though it should probably be a retpoline instead of an indirect jump. But do we care, as it only takes place during text_poke_bp() right? I don't think we need to worry about training trampoline branch prediction that can only be hit when something enables the jump. -- Steve
