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Date: Thu, 21 Dec 2000 20:55:58 +0000
From: Richard Hirst <rhirst@linuxcare.com>
To: Matthew Wilcox <matthew@wil.cx>
Cc: parisc-linux@thepuffingroup.com
Subject: Re: [parisc-linux] parisc64 kernel and ret1 (gr29) setup
Message-ID: <20001221205558.X2554@linuxcare.com>
References: <20001221160006.W2554@linuxcare.com> <20001221205723.A21472@parcelfarce.linux.theplanet.co.uk>
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In-Reply-To: <20001221205723.A21472@parcelfarce.linux.theplanet.co.uk>; from matthew@wil.cx on Thu, Dec 21, 2000 at 08:57:23PM +0000
List-ID: <linux-parisc.vger.kernel.org>

On Thu, Dec 21, 2000 at 08:57:23PM +0000, Matthew Wilcox wrote:
> On Thu, Dec 21, 2000 at 04:00:06PM +0000, Richard Hirst wrote:
> > At the moment we set up sp with "ldo TASK_SZ_ALGN+64(%r1),%r30" on syscall
> > entry.  For 64 bit presumably we should do something like:
> > 
> > 	ldo     TASK_SZ_ALGN+80(%r1),%r30
> > 	ldo	-16(%r30),%r29
> > 
> > Which gives 64 bytes for parameter saves, plus 16 bytes for rp+sp, and
> > initialises ret1.
> > 
> > Does that sound right?
> 
> does the 64-bit ABI relax the requirement for the stack to be 64-byte aligned?
> if not, it should be ldo TASK_SZ_ALIGN+128(%r1), %r30

Says "16 byte aligned", not 64.

Richard