linux-kernel - Re: [PATCH v10 1/3] arm64: Add __NR_* definitions for compat syscalls

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Message-ID: <12610204.3KbMJUth1j@wuerfel>
Date:	Wed, 28 Jan 2015 22:35:01 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linaro-kernel@...ts.linaro.org
Cc:	Timur Tabi <timur@...eaurora.org>,
	AKASHI Takahiro <takahiro.akashi@...aro.org>, rgb@...hat.com,
	Catalin Marinas <catalin.marinas@....com>,
	lkml <linux-kernel@...r.kernel.org>, eparis@...hat.com,
	Al Viro <viro@...iv.linux.org.uk>, linux-audit@...hat.com,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v10 1/3] arm64: Add __NR_* definitions for compat syscalls

On Wednesday 28 January 2015 15:31:49 Timur Tabi wrote:
> On Fri, Jul 4, 2014 at 2:28 AM, AKASHI Takahiro
> <takahiro.akashi@...aro.org> wrote:
> > +#define __ARM_NR_COMPAT_BASE           0x0f0000
> > +#define __ARM_NR_compat_cacheflush     (__ARM_NR_COMPAT_BASE+2)
> > +#define __ARM_NR_compat_set_tls                (__ARM_NR_COMPAT_BASE+5)
> 
> I know this patch is six months old, but I was wondering if anyone
> knows of any plans to make these syscalls available to 64-bit apps?
> We have a 32-bit app that uses __ARM_NR_compat_cacheflush, and we'd
> like to port that app to 64-bit.  I'm just not sure how to start doing
> that, since there don't appear to be any 64-bit ARM-specific syscalls.
> 

You can add architecture specific syscalls by using the 16 numbers following
__NR_arch_specific_syscall. Whether it makes sense to have a cacheflush
syscall on arm64, I have no idea.

I believe that we should not need a set_tls syscall though.

	Arnd
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