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From: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
To: Dave Martin <Dave.Martin@arm.com>
Cc: mtk.manpages@gmail.com, Russell King <linux@armlinux.org.uk>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	linux-man@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 2/2] syscall.2: arm64: Fix syscall number register size
Date: Wed, 6 May 2020 12:16:07 +0200	[thread overview]
Message-ID: <82affb91-8aa9-0316-421a-3ce503e396e0@gmail.com> (raw)
In-Reply-To: <1588692280-15878-3-git-send-email-Dave.Martin@arm.com>

On 5/5/20 5:24 PM, Dave Martin wrote:
> arm64 is currently documented as receiving the syscall number in
> x8.
> 
> While this is the correct register, the syscall number is a 32-bit
> integer.  Bits [63:32] are ignored by the kernel.
> 
> So it is more correct to say "w8".

Thanks, Dave. Patch applied, with Will's Acked-by.

Cheers,

Michael

> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
> ---
>  man2/syscall.2 | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/man2/syscall.2 b/man2/syscall.2
> index 53ab40e..d724651 100644
> --- a/man2/syscall.2
> +++ b/man2/syscall.2
> @@ -203,7 +203,7 @@ alpha	callsys	v0	v0	a4	a3	1, 6
>  arc	trap0	r8	r0	-	-
>  arm/OABI	swi NR	-	r0	-	-	2
>  arm/EABI	swi 0x0	r7	r0	r1	-
> -arm64	svc #0	x8	x0	x1	-
> +arm64	svc #0	w8	x0	x1	-
>  blackfin	excpt 0x0	P0	R0	-	-
>  i386	int $0x80	eax	eax	edx	-
>  ia64	break 0x100000	r15	r8	r9	r10	1, 6
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/

  parent reply	other threads:[~2020-05-06 10:16 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-05 15:24 [PATCH 0/2] syscall.2: Minor register name fixes for arm/arm64 Dave Martin
2020-05-05 15:24 ` [PATCH 1/2] syscall.2: arm: Use real register names for arm/OABI Dave Martin
2020-05-05 15:26   ` Russell King - ARM Linux admin
2020-05-05 15:53     ` Dave Martin
2020-05-06 10:05   ` Michael Kerrisk (man-pages)
2020-05-06 10:34     ` Dave Martin
2020-05-05 15:24 ` [PATCH 2/2] syscall.2: arm64: Fix syscall number register size Dave Martin
2020-05-05 15:54   ` Will Deacon
2020-05-05 16:06     ` Dave Martin
2020-05-06 10:16   ` Michael Kerrisk (man-pages) [this message]
2020-05-06 10:35     ` Dave Martin

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