linux-kernel - Re: 64-syscall args on 32-bit vs syscall()

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Message-ID: <4BA09D5D.5090602@redhat.com>
Date:	Wed, 17 Mar 2010 02:14:05 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	munroesj@...ibm.com, "H. Peter Anvin" <hpa@...or.com>,
	David Miller <davem@...emloft.net>, ralf@...ux-mips.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel@...savvy.com, torvalds@...ux-foundation.org
Subject: Re: 64-syscall args on 32-bit vs syscall()

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On 03/17/2010 01:56 AM, Benjamin Herrenschmidt wrote:
>>  - You keep the existing syscall() exported by glibc for binary
>> compatibility
> 
>>  - You add a new __syscall() (or whatever you want to name it) that adds
>> a dummy argument at the beginning, and whose implementation shifts
>> everything by 2 instead of 1 argument before calling into the kernel
> 
>>  - You define in unistd.h or whatever is relevant, a macro that does:
> 
>> #define syscall(__sysno, __args..) __syscall(0, _sysno, __args)
> 
>> I believe that should cover it, at least for powerpc, possibly for other
>> archs too though as I said, I may have missed something there.

How can this possibly be the case?  This will screw people who currently
work around the ppc limitations of the existing syscall.

Just leave it alone.

- -- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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