Re: [RFC PATCH] x86: Make sure verify_cpu has a good stack

[Borislav Petkov]

On Wed, Mar 02, 2016 at 09:53:28AM -0800, H. Peter Anvin wrote:
> Please explain why we can't use rip-relative addressing in some form...

We *can* do almost what Brian suggested:

        movq    stack_start(%rip), %rsp
        subq    $__START_KERNEL_map, %rsp

But we still have to subtract __START_KERNEL_map.

-- 
Regards/Gruss,
    Boris.

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