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From: Matthew Wilcox <matthew@wil.cx>
To: Randolph Chung <randolph@tausq.org>
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] 2.6.10-rc1-pa11 profile data
Date: Thu, 11 Nov 2004 17:50:21 +0000	[thread overview]
Message-ID: <20041111175021.GA26623@parcelfarce.linux.theplanet.co.uk> (raw)
In-Reply-To: <20041111174258.GT15714@tausq.org>

On Thu, Nov 11, 2004 at 09:42:58AM -0800, Randolph Chung wrote:
> eh? nononono. we should *always* be able to only preserve callee-saved
> registers. From the application point of view, when they call e.g.
> read(), it is a function call. The app should not expect any
> caller-saved registers to be preserved across the function/system call.

As I'm sure you already know, we do have to be careful to avoid leaking
kernel-internal or another task's information in the registers that
are call-clobbered.  I know some architectures do this by having a
kernel exit path that deliberately clobbers as many registers as possible.

-- 
"Next the statesmen will invent cheap lies, putting the blame upon 
the nation that is attacked, and every man will be glad of those
conscience-soothing falsities, and will diligently study them, and refuse
to examine any refutations of them; and thus he will by and by convince 
himself that the war is just, and will thank God for the better sleep 
he enjoys after this process of grotesque self-deception." -- Mark Twain
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  reply	other threads:[~2004-11-11 17:50 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-11-11  7:54 [parisc-linux] 2.6.10-rc1-pa11 profile data Grant Grundler
2004-11-11  8:11 ` Randolph Chung
2004-11-11 17:39   ` Carlos O'Donell
2004-11-11 17:42     ` Randolph Chung
2004-11-11 17:50       ` Matthew Wilcox [this message]
2004-11-11 17:59         ` Randolph Chung
2004-11-11 18:36           ` Grant Grundler
2004-11-11 18:23   ` Joel Soete
2004-11-11 18:51     ` Randolph Chung
2004-11-26 16:59   ` flush_kernel_[di]cache_page question? [WAS: " Joel Soete
2004-11-26 17:13     ` Randolph Chung
2004-11-26 19:02     ` Grant Grundler
2004-11-28 21:01   ` [id]cache meaning? [Was: [parisc-linux] 2.6.10-rc1-pa11 profile data] Joel Soete
2004-11-28 21:13     ` Matthew Wilcox
2004-11-29  1:14       ` Michael S. Zick
2004-11-29  2:00         ` Matthew Wilcox
2004-12-01 17:44   ` More questions " Joel Soete
2004-12-01 17:56     ` Matthew Wilcox
2004-12-01 18:33       ` Joel Soete
2004-12-03 10:24     ` Joel Soete
2004-12-03 15:41       ` Randolph Chung
2004-12-07 14:42         ` Joel Soete
2004-12-03 15:00   ` *lcul and memory granularity question[Was: " Joel Soete
2004-12-03 15:13     ` Matthew Wilcox
2004-11-12  5:29 ` [parisc-linux] 2.6.10-rc1-pa11 profile data Grant Grundler

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