linux-kernel - Re: Resend: [PATCH] x86-64: fix unwind annotations in syscall stubs

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Message-Id: <1283467775.10264.1393103393@webmail.messagingengine.com>
Date:	Fri, 03 Sep 2010 00:49:35 +0200
From:	"Alexander van Heukelum" <heukelum@...tmail.fm>
To:	"Jan Beulich" <JBeulich@...ell.com>, "Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Resend: [PATCH] x86-64: fix unwind annotations in syscall  stubs

On Thu, 02 Sep 2010 13:52 +0100, "Jan Beulich" <JBeulich@...ell.com> wrote:
> With the return address removed from the stack, these should really
> refer to their caller's register state.
> 
> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
> 
> ---
>  arch/x86/kernel/entry_64.S |    7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> --- linux-2.6.36-rc3/arch/x86/kernel/entry_64.S
> +++ 2.6.36-rc3-x86_64-stub-unwind-annotations/arch/x86/kernel/entry_64.S
> @@ -714,9 +714,8 @@ END(ptregscall_common)
>  
>  ENTRY(stub_execve)
>  	CFI_STARTPROC
> -       popq %r11
> -       CFI_ADJUST_CFA_OFFSET -8
> -       CFI_REGISTER rip, r11
> +       addq $8, %rsp
> +       PARTIAL_FRAME 0
>  	SAVE_REST
>  	FIXUP_TOP_OF_STACK %r11
>  	movq %rsp, %rcx
> @@ -735,7 +734,7 @@ END(stub_execve)
>  ENTRY(stub_rt_sigreturn)
>  	CFI_STARTPROC
>  	addq $8, %rsp
> -       CFI_ADJUST_CFA_OFFSET   -8
> +       PARTIAL_FRAME 0
>  	SAVE_REST
>  	movq %rsp,%rdi
>  	FIXUP_TOP_OF_STACK %r11
> 

Thanks for creating these...

Acked-by: Alexander van Heukelum <heukelum@...tmail.fm>
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