Re: Compat 32-bit syscall entry from 64-bit task!?

[H. Peter Anvin]

On 01/18/2012 01:01 PM, Linus Torvalds wrote:
> On Wed, Jan 18, 2012 at 12:55 PM, H. Peter Anvin <hpa@xxxxxxxxx> 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.

	-hpa

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