linux-kernel - Re: RFD: x32 ABI system call numbers

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Message-Id: <201108291704.08279.arnd@arndb.de>
Date:	Mon, 29 Aug 2011 17:04:08 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"H.J. Lu" <hjl.tools@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: RFD: x32 ABI system call numbers

On Saturday 27 August 2011, Christoph Hellwig wrote:
> On Fri, Aug 26, 2011 at 05:57:34PM -0700, H. Peter Anvin wrote:
> > On 08/26/2011 05:36 PM, Linus Torvalds wrote:
> > > If you want to be compatible with "int 0x80" and old libraries, then I
> > > really don't see why you would introduce anything new.
> > 
> > Just to be clear, the reason to keep the LFS stuff in there was to be
> > compatible with the existing 32-bit *programming model*, so that a
> > program recompiled from i386 to x32 should behave the same.
> > 
> > Not that anyone should compile without -D_FILE_OFFSET_BITS=64 these days...
> 
> Any new port should not even offer non-LFS system calls.  They are a
> pain in the but, and I would sacrifice chicken if we coud stop glibc
> offering it as a default that way.

Right. The asm-generic/unistd.h interface doesn't provide them either
for new architectures and expects libc to emulate them for any user
application whose developers can't be bothered to fix their code.

I think I've also commented in the past that I think x32 should use
the same set of syscalls asm asm-generic, even if it's more convenient
to use a different ordering.

	Arnd
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