linux-kernel - Re: Resend: [PATCH] x86-64: use symbolics instead of raw numbers in entry

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Date:	Fri, 03 Sep 2010 00:53:09 +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: use symbolics instead of raw numbers  in
 entry_64.S

On Thu, 02 Sep 2010 13:55 +0100, "Jan Beulich" <JBeulich@...ell.com> wrote:
> ... making the code a little less fragile.
> 
> Also use pushq_cfi instead of raw CFI annotations in two more places,
> and add two missing annotations after stack pointer adjustments which
> got modified here anyway.
> 
> Signed-off-by: Jan Beulich <jbeulich@...ell.com>

Good cleanup.

Generated binary is identical...

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

> ---
>  arch/x86/kernel/entry_64.S |   32 ++++++++++++++++----------------
>  1 file changed, 16 insertions(+), 16 deletions(-)
> 
> --- linux-2.6.36-rc3/arch/x86/kernel/entry_64.S
> +++ 2.6.36-rc3-x86_64-unwind-annotations/arch/x86/kernel/entry_64.S
> @@ -796,8 +796,8 @@ END(interrupt)
>  
>  /* 0(%rsp): ~(interrupt number) */
>  	.macro interrupt func
> -       subq $10*8, %rsp
> -       CFI_ADJUST_CFA_OFFSET 10*8
> +       subq $ORIG_RAX-ARGOFFSET+8, %rsp
> +       CFI_ADJUST_CFA_OFFSET ORIG_RAX-ARGOFFSET+8
>  	call save_args
>  	PARTIAL_FRAME 0
>  	call \func
> @@ -1036,8 +1036,8 @@ ENTRY(\sym)
>  	INTR_FRAME
>  	PARAVIRT_ADJUST_EXCEPTION_FRAME
>  	pushq_cfi $-1		/* ORIG_RAX: no syscall to restart */
> -       subq $15*8,%rsp
> -       CFI_ADJUST_CFA_OFFSET 15*8
> +       subq $ORIG_RAX-R15, %rsp
> +       CFI_ADJUST_CFA_OFFSET ORIG_RAX-R15
>  	call error_entry
>  	DEFAULT_FRAME 0
>  	movq %rsp,%rdi		/* pt_regs pointer */
> @@ -1052,9 +1052,9 @@ END(\sym)
>  ENTRY(\sym)
>  	INTR_FRAME
>  	PARAVIRT_ADJUST_EXCEPTION_FRAME
> -       pushq $-1               /* ORIG_RAX: no syscall to restart */
> -       CFI_ADJUST_CFA_OFFSET 8
> -       subq $15*8, %rsp
> +       pushq_cfi $-1           /* ORIG_RAX: no syscall to restart */
> +       subq $ORIG_RAX-R15, %rsp
> +       CFI_ADJUST_CFA_OFFSET ORIG_RAX-R15
>  	call save_paranoid
>  	TRACE_IRQS_OFF
>  	movq %rsp,%rdi		/* pt_regs pointer */
> @@ -1070,9 +1070,9 @@ END(\sym)
>  ENTRY(\sym)
>  	INTR_FRAME
>  	PARAVIRT_ADJUST_EXCEPTION_FRAME
> -       pushq $-1               /* ORIG_RAX: no syscall to restart */
> -       CFI_ADJUST_CFA_OFFSET 8
> -       subq $15*8, %rsp
> +       pushq_cfi $-1           /* ORIG_RAX: no syscall to restart */
> +       subq $ORIG_RAX-R15, %rsp
> +       CFI_ADJUST_CFA_OFFSET ORIG_RAX-R15
>  	call save_paranoid
>  	TRACE_IRQS_OFF
>  	movq %rsp,%rdi		/* pt_regs pointer */
> @@ -1089,8 +1089,8 @@ END(\sym)
>  ENTRY(\sym)
>  	XCPT_FRAME
>  	PARAVIRT_ADJUST_EXCEPTION_FRAME
> -       subq $15*8,%rsp
> -       CFI_ADJUST_CFA_OFFSET 15*8
> +       subq $ORIG_RAX-R15, %rsp
> +       CFI_ADJUST_CFA_OFFSET ORIG_RAX-R15
>  	call error_entry
>  	DEFAULT_FRAME 0
>  	movq %rsp,%rdi			/* pt_regs pointer */
> @@ -1107,8 +1107,8 @@ END(\sym)
>  ENTRY(\sym)
>  	XCPT_FRAME
>  	PARAVIRT_ADJUST_EXCEPTION_FRAME
> -       subq $15*8,%rsp
> -       CFI_ADJUST_CFA_OFFSET 15*8
> +       subq $ORIG_RAX-R15, %rsp
> +       CFI_ADJUST_CFA_OFFSET ORIG_RAX-R15
>  	call save_paranoid
>  	DEFAULT_FRAME 0
>  	TRACE_IRQS_OFF
> @@ -1498,8 +1498,8 @@ ENTRY(nmi)
>  	INTR_FRAME
>  	PARAVIRT_ADJUST_EXCEPTION_FRAME
>  	pushq_cfi $-1
> -       subq $15*8, %rsp
> -       CFI_ADJUST_CFA_OFFSET 15*8
> +       subq $ORIG_RAX-R15, %rsp
> +       CFI_ADJUST_CFA_OFFSET ORIG_RAX-R15
>  	call save_paranoid
>  	DEFAULT_FRAME 0
>  	/* paranoidentry do_nmi, 0; without TRACE_IRQS_OFF */
> 
> 
> 
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