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Re: [PATCH 4/9] xen/arm32: head: Remove 'r6' from the clobber list of create_page_tables()
- To: Julien Grall <julien@xxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Wed, 28 Jun 2023 10:12:45 +0000
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Luca Fancellu <Luca.Fancellu@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Henry Wang <Henry.Wang@xxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Wed, 28 Jun 2023 10:13:15 +0000
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- Thread-topic: [PATCH 4/9] xen/arm32: head: Remove 'r6' from the clobber list of create_page_tables()
Hi Julien,
> On 25 Jun 2023, at 22:49, Julien Grall <julien@xxxxxxx> wrote:
>
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> Since commit 62529f16c8a2 ("xen/arm32: head: Use a page mapping for the
> 1:1 mapping in create_page_tables()"), the register 'r6' is not used
> anymore within create_page_tables(). So remove it from the documentation.
>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
Cheers
Bertrand
> ---
> xen/arch/arm/arm32/head.S | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/xen/arch/arm/arm32/head.S b/xen/arch/arm/arm32/head.S
> index 997c8a4fbbc1..5e3692eb3abf 100644
> --- a/xen/arch/arm/arm32/head.S
> +++ b/xen/arch/arm/arm32/head.S
> @@ -451,10 +451,7 @@ ENDPROC(cpu_init)
> * Output:
> * r12: Was a temporary mapping created?
> *
> - * Clobbers r0 - r4, r6
> - *
> - * Register usage within this function:
> - * r6 : Identity map in place
> + * Clobbers r0 - r4
> */
> create_page_tables:
> /* Prepare the page-tables for mapping Xen */
> --
> 2.40.1
>
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