linux-kernel - Re: [PATCH] ARM: Add unwinding support for memmove function

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Date:	Tue, 25 Nov 2014 11:45:41 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Lin Yongting <linyongting@...il.com>
Cc:	victor.kamensky@...aro.org, nico@...aro.org,
	linux-arm-kernel@...ts.infradead.org, will.deacon@....com,
	linux-kernel@...r.kernel.org, linyongting@...wei.com
Subject: Re: [PATCH] ARM: Add unwinding support for memmove function

On Mon, Nov 24, 2014 at 09:45:56PM +0800, Lin Yongting wrote:
> @@ -27,12 +28,17 @@
>   */
>  
>  ENTRY(memmove)
> +	UNWIND(	.fnstart			)
>  
>  		subs	ip, r0, r1
>  		cmphi	r2, ip
>  		bls	memcpy
>  
>  		stmfd	sp!, {r0, r4, lr}
> +	UNWIND(	.fnend				)
> +
> +	UNWIND(	.fnstart			)
> +	UNWIND(	.save	{r0, r4, lr}		) @ in first stmfd block

This is pretty horrid, but I guess it's necessary due to how the unwinder
works.  If no one has any objections, please drop it in the patch system
and I'll queue it for the next merge window.

Thanks.

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