linux-kernel - Re: [PATCH 5/6] Begin abstraction of sensitive instructions: asm files

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Message-ID: <44C5338D.4060805@goop.org>
Date:	Mon, 24 Jul 2006 13:54:37 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <ak@....de>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	Chuck Ebbert <76306.1226@...puserve.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH 5/6] Begin abstraction of sensitive instructions: asm
 files

Andi Kleen wrote:
> I would rather pass the register to the macro? If you start to
> clobber registers you would need to pass in the tmp registers
> too I guess.
The intent is that these code sequences can be patched in place, so they 
need to have a specific abi at the machine-code level.  Some of the 
operations whose Xen implementation clobbers a register have that in 
their definition, on the assumption that 1 temp is enough, and that 
another interface which needs more can organize save/restoring registers 
for itself.

    J
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