From: "H. Peter Anvin" <hpa@zytor.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ulrich Drepper <drepper@redhat.com>,
munroesj@us.ibm.com, David Miller <davem@davemloft.net>,
ralf@linux-mips.org, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org, kernel@teksavvy.com,
torvalds@linux-foundation.org
Subject: Re: 64-syscall args on 32-bit vs syscall()
Date: Wed, 17 Mar 2010 11:30:42 -0700 [thread overview]
Message-ID: <4BA11FD2.2090104@zytor.com> (raw)
In-Reply-To: <1268816179.2335.187.camel@pasglop>
On 03/17/2010 01:56 AM, Benjamin Herrenschmidt wrote:
>
> Ok, so I -may- be missing something, but I believe this won't break
> anything:
>
> - 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)
>
Again, this is *exactly* symbol versioning done by hand... we have
proper symbol versioning, let's use it.
-hpa
next prev parent reply other threads:[~2010-03-17 18:35 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-15 4:48 64-syscall args on 32-bit vs syscall() Benjamin Herrenschmidt
2010-03-15 4:48 ` Benjamin Herrenschmidt
2010-03-15 5:06 ` David Miller
2010-03-15 5:18 ` Benjamin Herrenschmidt
2010-03-15 5:54 ` David Miller
2010-03-15 20:22 ` Benjamin Herrenschmidt
2010-03-15 13:44 ` Ralf Baechle
2010-03-15 15:13 ` H. Peter Anvin
2010-03-15 16:00 ` Ulrich Drepper
2010-03-15 19:00 ` David Miller
2010-03-15 19:41 ` H. Peter Anvin
2010-03-15 20:35 ` Benjamin Herrenschmidt
2010-03-15 20:41 ` H. Peter Anvin
2010-03-16 21:56 ` Steven Munroe
2010-03-17 0:31 ` Benjamin Herrenschmidt
2010-03-17 0:31 ` Benjamin Herrenschmidt
2010-03-17 5:52 ` Ulrich Drepper
2010-03-17 8:56 ` Benjamin Herrenschmidt
2010-03-17 9:14 ` Ulrich Drepper
2010-03-17 10:13 ` Benjamin Herrenschmidt
2010-03-17 9:18 ` Jamie Lokier
2010-03-17 10:18 ` Benjamin Herrenschmidt
2010-03-17 18:30 ` H. Peter Anvin [this message]
2010-03-17 20:35 ` Benjamin Herrenschmidt
2010-03-17 20:53 ` H. Peter Anvin
2010-03-17 22:58 ` Benjamin Herrenschmidt
2010-03-17 22:58 ` Benjamin Herrenschmidt
2010-03-18 16:08 ` Steven Munroe
2010-03-18 16:21 ` Andreas Schwab
2010-03-18 16:21 ` Andreas Schwab
2010-03-18 17:03 ` Steven Munroe
2010-03-18 21:18 ` Benjamin Herrenschmidt
2010-03-19 1:22 ` Jamie Lokier
2010-03-15 20:27 ` Benjamin Herrenschmidt
2010-03-15 15:03 ` Steven Munroe
2010-03-15 20:32 ` Benjamin Herrenschmidt
2010-03-15 15:04 ` Jamie Lokier
2010-03-15 20:33 ` Benjamin Herrenschmidt
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