Messages in this thread | | | Date | Wed, 10 Oct 2018 14:56:08 -0400 | From | Steven Rostedt <> | Subject | Re: [POC][RFC][PATCH 1/2] jump_function: Addition of new feature "jump_function" |
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On Wed, 10 Oct 2018 13:33:30 -0500 Josh Poimboeuf <jpoimboe@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
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