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Message-ID: <4F1737C9.3070905@zytor.com>
Date: Wed, 18 Jan 2012 13:21:13 -0800
From: "H. Peter Anvin" <hpa@...or.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
CC: Indan Zupancic <indan@....nu>, Andi Kleen <andi@...stfloor.org>,
Jamie Lokier <jamie@...reable.org>,
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Roland McGrath <mcgrathr@...omium.org>
Subject: Re: Compat 32-bit syscall entry from 64-bit task!?
On 01/18/2012 01:04 PM, H. Peter Anvin wrote:
> On 01/18/2012 01:01 PM, Linus Torvalds wrote:
>> On Wed, Jan 18, 2012 at 12:55 PM, H. Peter Anvin <hpa@...or.com> wrote:
>>>
>>> If we're going to use bits in an existing register field I would be
>>> happier if we used bits [31:16] of CS, which are unlikely to ever be
>>> used for anything.
>>
>> See my note about that: I would have preferred CS or ORIG_AX myself,
>> but that breaks existing binaries. So that isn't really an option.
>>
>
> Fair enough. Sigh. I still think an actual pseudo-register would be
> better.
>
Roland, could you refresh my memory what your objection to this was?
-hpa
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