linux-kernel - Re: [PATCH 01/23] all: syscall wrappers: add documentation

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Message-ID: <20160527093052.GB7865@e104818-lin.cambridge.arm.com>
Date:	Fri, 27 May 2016 10:30:52 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	Yury Norov <ynorov@...iumnetworks.com>,
	David Miller <davem@...emloft.net>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-s390@...r.kernel.org, libc-alpha@...rceware.org,
	schwidefsky@...ibm.com, pinskia@...il.com, broonie@...nel.org,
	joseph@...esourcery.com, christoph.muellner@...obroma-systems.com,
	bamvor.zhangjian@...wei.com, szabolcs.nagy@....com,
	klimov.linux@...il.com, Nathan_Lynch@...tor.com, agraf@...e.de,
	Prasun.Kapoor@...iumnetworks.com, kilobyte@...band.pl,
	geert@...ux-m68k.org, philipp.tomsich@...obroma-systems.com
Subject: Re: [PATCH 01/23] all: syscall wrappers: add documentation

On Fri, May 27, 2016 at 10:42:59AM +0200, Arnd Bergmann wrote:
> On Friday, May 27, 2016 8:03:57 AM CEST Heiko Carstens wrote:
> > > > > > Cost wise, this seems like it all cancels out in the end, but what
> > > > > > do I know?
> > > > > 
> > > > > I think you know something, and I also think Heiko and other s390 guys
> > > > > know something as well. So I'd like to listen their arguments here.
> > 
> > If it comes to 64 bit arguments for compat system calls: s390 also has an
> > x32-like ABI extension which allows user space to use full 64 bit
> > registers. As far as I know hardly anybody ever made use of that.
> > 
> > However even if that would be widely used, to me it wouldn't make sense to
> > add new compat system calls which allow 64 bit arguments, simply because
> > something like
> > 
> > c = (u32)a | (u64)b << 32;
> > 
> > can be done with a single 1-cycle instruction. It's just not worth the
> > extra effort to maintain additional system call variants.
> 
> For reference, both tile and mips also have separate 32-bit ABIs that are
> only used on 64-bit kernels (aside from the normal 32-bit ABI). Tile
> does it like s390 and passes 64-bit arguments as pairs, while MIPS
> and x86 and pass them as single registers.

AFAIK, x32 also requires that the upper half of a 64-bit reg is zeroed
by the user when a 32-bit value is passed. We could require the same on
AArch64/ILP32 but I'm a bit uneasy on trusting a multitude of C
libraries on this.

-- 
Catalin