Messages in this thread | | | Date | Fri, 4 Mar 2022 20:48:53 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v3 18/39] x86/ibt,ftrace: Make function-graph play nice |
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On Fri, Mar 04, 2022 at 09:51:54AM -0800, Josh Poimboeuf wrote: > On Thu, Mar 03, 2022 at 12:23:39PM +0100, Peter Zijlstra wrote: > > + > > + addq $16, %rsp > > + ANNOTATE_INTRA_FUNCTION_CALL > > + call .Ldo_rop > > + int3 > > +.Ldo_rop: > > + mov %rdi, (%rsp) > > + UNWIND_HINT_FUNC > > + RET > > Why the int3?
Speculation trap :-) Either I'm too paranoid or not paranoid enough; but without it it's just too close to a retpoline and it doesn't feel right.
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