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Re: [Xen-devel] [RFC v2 13/23] x86/power/64: Adapt assembly for PIE support



On Thu 2017-08-10 10:26:05, 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.
> 
> Signed-off-by: Thomas Garnier <thgarnie@xxxxxxxxxx>

Acked-by: Pavel Machek <pavel@xxxxxx>

> --- a/arch/x86/power/hibernate_asm_64.S
> +++ b/arch/x86/power/hibernate_asm_64.S
> @@ -24,7 +24,7 @@
>  #include <asm/frame.h>
>  
>  ENTRY(swsusp_arch_suspend)
> -     movq    $saved_context, %rax
> +     leaq    saved_context(%rip), %rax
>       movq    %rsp, pt_regs_sp(%rax)
>       movq    %rbp, pt_regs_bp(%rax)
>       movq    %rsi, pt_regs_si(%rax)
> @@ -115,7 +115,7 @@ ENTRY(restore_registers)
>       movq    %rax, %cr4;  # turn PGE back on
>  
>       /* We don't restore %rax, it must be 0 anyway */
> -     movq    $saved_context, %rax
> +     leaq    saved_context(%rip), %rax
>       movq    pt_regs_sp(%rax), %rsp
>       movq    pt_regs_bp(%rax), %rbp
>       movq    pt_regs_si(%rax), %rsi

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) 
http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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