On Fri, 2018-01-12 at 18:00 +0000, Andrew Cooper wrote:
> 
> +.macro IND_THUNK_RETPOLINE reg:req
> +        call 2f
> +1:

Linux and GCC have now settled on 'pause;lfence;jmp' here.

> +        lfence
> +        jmp 1b
> +2:
> +        mov %\reg, (%rsp)
> +        ret
> +.endm
> +

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