From: Andreas Schwab <schwab@linux-m68k.org>
To: Brad Boyer <flar@allandria.com>
Cc: Maxim Kuvyrkov <maxim@codesourcery.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
linux-m68k@vger.kernel.org
Subject: Re: Add private syscalls to support NPTL
Date: Wed, 19 Aug 2009 10:35:39 +0200 [thread overview]
Message-ID: <m3skfonquc.fsf@hase.home> (raw)
In-Reply-To: <20090818234017.GA32464@cynthia.pants.nu> (Brad Boyer's message of "Tue, 18 Aug 2009 16:40:17 -0700")
Brad Boyer <flar@allandria.com> writes:
> On Tue, Aug 18, 2009 at 11:07:26AM +0400, Maxim Kuvyrkov wrote:
>> The reason for this calling convention is to minimize difference in
>> invokation of the vDSO helper and the syscall. The helper gets its
>> arguments in a0 (mem), d0 (oldval) and d1 (newval); in a stub, which is
>> used when vDSO is not available, one then can do:
>>
>> movel %d0,%a1
>> movel #NR,%d0
>> trap #0
>
> Then wouldn't it make sense to use %d2 instead of %a1?
d2 is a callee-saved register, a1 isn't.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2009-08-19 8:37 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-17 21:48 Add private syscalls to support NPTL Maxim Kuvyrkov
2009-08-17 22:11 ` Andreas Schwab
2009-08-18 7:15 ` Maxim Kuvyrkov
2009-08-18 8:06 ` Andreas Schwab
2009-08-18 8:56 ` Maxim Kuvyrkov
2009-08-18 9:22 ` Geert Uytterhoeven
2009-08-18 9:36 ` Maxim Kuvyrkov
2009-08-18 18:18 ` Andreas Schwab
2009-08-23 20:21 ` Maxim Kuvyrkov
2009-08-25 19:43 ` Maxim Kuvyrkov
2009-08-28 10:51 ` Maxim Kuvyrkov
2009-10-02 9:59 ` Maxim Kuvyrkov
2009-10-26 15:01 ` Maxim Kuvyrkov
2009-10-28 1:19 ` Finn Thain
2009-10-28 6:54 ` Maxim Kuvyrkov
2009-10-28 16:38 ` Finn Thain
2009-11-06 8:38 ` Finn Thain
2009-11-06 8:59 ` Maxim Kuvyrkov
2009-11-10 4:07 ` Finn Thain
2009-11-10 4:20 ` Brad Boyer
2009-11-10 10:51 ` Maxim Kuvyrkov
2009-11-10 16:11 ` Finn Thain
2009-08-17 22:18 ` Andreas Schwab
2009-08-18 7:10 ` Maxim Kuvyrkov
2009-08-18 2:28 ` Brad Boyer
2009-08-18 7:07 ` Maxim Kuvyrkov
2009-08-18 23:40 ` Brad Boyer
2009-08-19 8:06 ` Maxim Kuvyrkov
2009-08-19 8:35 ` Andreas Schwab [this message]
2009-12-07 8:38 ` Maxim Kuvyrkov
2009-12-09 10:25 ` Klaus Kuehnhammer
2009-12-09 11:05 ` Maxim Kuvyrkov
[not found] ` <DBFD40BF-19FC-47DF-8A7C-B71261AFBD85@parq.net>
[not found] ` <4B1F9492.6030604@codesourcery.com>
2009-12-09 15:44 ` Klaus Kuehnhammer
2009-12-10 9:18 ` Maxim Kuvyrkov
2009-12-11 14:01 ` Geert Uytterhoeven
2009-12-11 16:23 ` Maxim Kuvyrkov
2009-12-17 17:53 ` Maxim Kuvyrkov
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