From: "H. Peter Anvin" <hpa@zytor.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: Gautam Singaraju <gautam.singaraju@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: syscall macro fails upon compilation
Date: Fri, 06 Jul 2007 09:11:08 -0700 [thread overview]
Message-ID: <468E699C.1000502@zytor.com> (raw)
In-Reply-To: <p73r6nl21fe.fsf@bingen.suse.de>
Andi Kleen wrote:
> "H. Peter Anvin" <hpa@zytor.com> writes:
>
>> Gautam Singaraju wrote:
>>> I use the _syscall0 macro.
>> Don't. The _syscall*() macros have been unsupported for ages,
>
> That's not true. I supported them on x86 before they were removed against
> my objections.
>
>> and broken for ever longer.
>
> Well, most syscall() versions get 6 argument calls wrong
> (not sure if that is finally fixed). _syscall*() didn't support
> -fPIC for larger argument counts (_syscall0-2 never had a problem)
>
> So all alternatives short of writing your own stub had various
> issues. If you needed 6 argument calls _syscall* was typically
> the best alternative.
>
They were *always* broken for 64-bit arguments on 32-bit machines, however.
-hpa
next prev parent reply other threads:[~2007-07-06 16:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-05 22:09 Gautam Singaraju
2007-07-05 22:13 ` H. Peter Anvin
2007-07-06 11:53 ` Andi Kleen
2007-07-06 15:55 ` Gautam Singaraju
2007-07-06 16:12 ` H. Peter Anvin
2007-07-06 16:11 ` H. Peter Anvin [this message]
2007-07-06 17:05 ` Andi Kleen
2007-07-06 17:19 ` H. Peter Anvin
2007-07-05 22:17 ` Davide Libenzi
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