Re: [PATCH v9 04/11] x86/entry/64: Adapt assembly for PIE support

[Borislav Petkov]

On Mon, Aug 05, 2019 at 10:50:30AM -0700, Thomas Garnier wrote:
> I saw that %rdx was used for temporary usage and restored before the
> end so I assumed that it was not an option.

PUSH_AND_CLEAR_REGS saves all regs earlier so I think you should be
able to use others. Like SAVE_AND_SWITCH_TO_KERNEL_CR3/RESTORE_CR3, for
example, uses %r15 and %r14.

-- 
Regards/Gruss,
    Boris.

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