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Re: [Xen-devel] x86: PIE support and option to extend KASLR randomization

On Fri, Sep 22, 2017 at 11:38 AM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
> We lose EBX on 32 bits, but we don't lose RBX on 64 bits - since x86-64
> has RIP-relative addressing there is no need for a dedicated PIC register.

FWIW, since gcc 5, the PIC register isn't totally lost. It is now
reusable, and that seems to have improved performance:


Kees Cook
Pixel Security

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