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From: Jes Sorensen <jes@sgi.com>
To: Thibaut VARENE <T-Bone@parisc-linux.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>,
	parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] [RFC] using 64bit wide registers with 32bit kernel
Date: Mon, 15 May 2006 12:56:16 +0200	[thread overview]
Message-ID: <44685E50.7040908@sgi.com> (raw)
In-Reply-To: <7d01f9f00605150255u5846f144u9c95cab3ffd35133@mail.gmail.com>

Thibaut VARENE wrote:
> On 15 May 2006 05:10:15 -0400, Jes Sorensen <jes@sgi.com> wrote:
>> What about setting an ELF flag or somesuch, set a task flag based on
>> this and then only do the extended register file backup for these
>> apps?
> 
> If that's possible *and* acceptable, it might be very helpful indeed.

I don't know anything about the PARISC ELF specification, but I think
it ought to be feasible.

Alternatively, if you can trap the instruction so you get a kernel trap
the first time the user app tries to do this and then set the flag then.
Otherwise there is the problem that someone will do some hand tuned
assembly that uses the 64 bit regs and you end up with mocked up state
if this goes undetected.

Cheers,
Jes
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  parent reply	other threads:[~2006-05-15 10:56 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-05-13 15:41 [parisc-linux] [RFC] using 64bit wide registers with 32bit kernel Thibaut VARENE
2006-05-13 16:33 ` [parisc-linux] " Thibaut VARENE
2006-05-13 17:03 ` [parisc-linux] " James Bottomley
2006-05-13 22:32   ` Thibaut VARENE
     [not found]   ` <yq0ves7psaw.fsf@jaguar.mkp.net>
     [not found]     ` <7d01f9f00605150255u5846f144u9c95cab3ffd35133@mail.gmail.com>
2006-05-15 10:56       ` Jes Sorensen [this message]
2006-05-15 11:53     ` Kyle McMartin
2006-05-13 17:07 ` John David Anglin
2006-05-13 22:43   ` Thibaut VARENE
2006-05-13 23:35     ` John David Anglin
2006-05-14  5:06       ` John Marvin
2006-05-14  6:27       ` Grant Grundler
     [not found]         ` <200605141510.k4EFAUv7006350@hiauly1.hia.nrc.ca>
2006-05-15  1:06           ` Grant Grundler

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