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Message-ID: <20180524110306.GA20225@amd>
Date: Thu, 24 May 2018 13:03:06 +0200
From: Pavel Machek <pavel@....cz>
To: Thomas Garnier <thgarnie@...gle.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>,
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Subject: Re: [PATCH v3 09/27] x86/acpi: Adapt assembly for PIE support
On Wed 2018-05-23 12:54:03, Thomas Garnier wrote:
> Change the assembly code to use only relative references of symbols for the
> kernel to be PIE compatible.
>
> Position Independent Executable (PIE) support will allow to extended the
> KASLR randomization range below the -2G memory limit.
What testing did this get?
> diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S
> index 50b8ed0317a3..472659c0f811 100644
> --- a/arch/x86/kernel/acpi/wakeup_64.S
> +++ b/arch/x86/kernel/acpi/wakeup_64.S
> @@ -14,7 +14,7 @@
> * Hooray, we are in Long 64-bit mode (but still running in low memory)
> */
> ENTRY(wakeup_long64)
> - movq saved_magic, %rax
> + movq saved_magic(%rip), %rax
> movq $0x123456789abcdef0, %rdx
> cmpq %rdx, %rax
> jne bogus_64_magic
Because, as comment says, this is rather tricky code.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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