linux-kernel - Re: [PATCH] [34/58] x86_64: ia32entry adjustments

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Date:	Thu, 19 Jul 2007 10:46:58 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Andi Kleen <ak@...e.de>
CC:	jbeulich@...ell.com, patches@...-64.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] [34/58] x86_64: ia32entry adjustments

Andi Kleen wrote:
> From: "Jan Beulich" <jbeulich@...ell.com>
> Consolidate the three 32-bit system call entry points so that they all
> treat registers in similar ways.
> 
> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
> Signed-off-by: Andi Kleen <ak@...e.de>
> 
>  arch/x86_64/ia32/ia32entry.S |    5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> Index: linux/arch/x86_64/ia32/ia32entry.S
> ===================================================================
> --- linux.orig/arch/x86_64/ia32/ia32entry.S
> +++ linux/arch/x86_64/ia32/ia32entry.S
> @@ -104,7 +104,7 @@ ENTRY(ia32_sysenter_target)
>  	pushq	%rax
>  	CFI_ADJUST_CFA_OFFSET 8
>  	cld
> -	SAVE_ARGS 0,0,0
> +	SAVE_ARGS 0,0,1
>   	/* no need to do an access_ok check here because rbp has been
>   	   32bit zero extended */ 
>  1:	movl	(%rbp),%r9d
> @@ -294,7 +294,7 @@ ia32_badarg:
>   */ 				
>  
>  ENTRY(ia32_syscall)
> -	CFI_STARTPROC	simple
> +	CFI_STARTPROC32	simple
>  	CFI_SIGNAL_FRAME
>  	CFI_DEF_CFA	rsp,SS+8-RIP
>  	/*CFI_REL_OFFSET	ss,SS-RIP*/
> @@ -330,6 +330,7 @@ ia32_sysret:
>  
>  ia32_tracesys:			 
>  	SAVE_REST
> +	CLEAR_RREGS
>  	movq $-ENOSYS,RAX(%rsp)	/* really needed? */
>  	movq %rsp,%rdi        /* &pt_regs -> arg1 */
>  	call syscall_trace_enter

More comments and/or a less vague patch description would be nice.

What registers?  What behavior is being made common?  Why?

	Jeff


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