On Fri, 2018-01-05 at 15:50 -0800, Linus Torvalds wrote: > > > + > > +.macro RETPOLINE_CALL reg:req > > + jmp 1113f > > +1110: RETPOLINE_JMP \reg > > +1113: call 1110b > > +.endm
(Note that RETPOLINE_CALL is purely internal to nospec-branch.h, used only from the NOSPEC_CALL macro to make the ALTERNATIVE_2 invocation les s ugly than it would have been. But the same applies to NOSPEC_CALL which is the one that gets used in our .S files including retpoline.S) > Why do these still force a register name? > > Is it because this is the only user? By "register name" are you asking why it's invoked as "NOSPEC_CALL rbx" instead of "NOSPEC_CALL %rbx" with the percent sign? I think I can probably clean that up now, and turn a lot of %\reg occurrences into just \reg. The only remaining %\reg would be left in retpoline.S inside the THUNK macro used from .irp.
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