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Date: Wed, 14 Mar 2018 11:29:51 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Thomas Garnier <thgarnie@...gle.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>,
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Subject: Re: [PATCH v2 06/27] x86/entry/64: Adapt assembly for PIE support
On Tue, Mar 13, 2018 at 01:59:24PM -0700, Thomas Garnier wrote:
> @@ -1576,7 +1578,9 @@ first_nmi:
> addq $8, (%rsp) /* Fix up RSP */
> pushfq /* RFLAGS */
> pushq $__KERNEL_CS /* CS */
> - pushq $1f /* RIP */
> + pushq %rax /* Support Position Independent Code */
> + leaq 1f(%rip), %rax /* RIP */
> + xchgq %rax, (%rsp) /* Restore RAX, put 1f */
> iretq /* continues at repeat_nmi below */
> UNWIND_HINT_IRET_REGS
> 1:
Urgh, xchg with a memop has an implicit LOCK prefix.
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