linux-kernel - Re: [PATCH] arch: avr32: add dummy syscalls

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Date:	Mon, 4 Feb 2013 08:34:47 -0800
From:	Håvard Skinnemoen <hskinnemoen@...il.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Hans-Christian Egtvedt <egtvedt@...fundet.no>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Dave Jones <davej@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arch: avr32: add dummy syscalls

On Mon, Feb 4, 2013 at 7:39 AM, Al Viro <viro@...iv.linux.org.uk> wrote:
> On Sun, Feb 03, 2013 at 09:35:39PM -0800, H?vard Skinnemoen wrote:
>>
>> > But yes, 32bit/32bit/64bit/32bit is another interesting case -
>> > fanotify_mark is 32/32/64/32/32.  From what ABI says it would seem to
>> > be r12/r11/r8:r9/r10/stack, but if I understand you correctly, we'll
>> > end up wanting *two* arguments on stack...
>>
>> Yes, I think there may be a difference between the IAR and gcc ABI
>> here. But I could be wrong.
>
> So it will use the gap in case of 32/32/64/32; the first two calls will
> take index 0 and 1 (r12 and r11 resp.), the third will take 3 and 4
> (r9:r8) and the fourth will take 2 (r10).

Oh, cool. I guess I am wrong then. Thanks a lot for taking the time to
figure this out, and sorry I misled you.

If someone's got the toolchain installed (which I don't, sorry), it
should be relatively straightforward to verify this by looking at the
disassembly of a call to a function with a similar prototype.

Havard
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