"H.J. Lu" <hjl.to...@gmail.com> writes:
> Here is the updated patch.
Thanks!
> +#ifdef __i386__
> +static unsigned int
> +_get_ssp(void)
> +{
> + unsigned int ssp;
> + asm volatile("xor %0, %0\n\trdsspd %0" : "=r" (ssp));
> + return ssp;
> +}
> +#else
I take it the rdssp instruction is a nop on older processors? I had a
quick look at
https://software.intel.com/sites/default/files/managed/4d/2a/control-flow-enforcement-technology-preview.pdf
and I don't find any mention of a cpuid bit to check before using this
instruction.
Regards,
/Niels
--
Niels Möller. PGP-encrypted email is preferred. Keyid 368C6677.
Internet email is subject to wholesale government surveillance.
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