From owner-freebsd-arch Fri Jan 11 14:55: 5 2002 Delivered-To: freebsd-arch@freebsd.org Received: from ns.yogotech.com (ns.yogotech.com [206.127.123.66]) by hub.freebsd.org (Postfix) with ESMTP id E9ABA37B41A for ; Fri, 11 Jan 2002 14:55:01 -0800 (PST) Received: from caddis.yogotech.com (caddis.yogotech.com [206.127.123.130]) by ns.yogotech.com (8.9.3/8.9.3) with ESMTP id PAA05164; Fri, 11 Jan 2002 15:54:57 -0700 (MST) (envelope-from nate@yogotech.com) Received: (from nate@localhost) by caddis.yogotech.com (8.11.6/8.11.6) id g0BMsuJ14276; Fri, 11 Jan 2002 15:54:56 -0700 (MST) (envelope-from nate) From: Nate Williams MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15423.27968.568803.625566@caddis.yogotech.com> Date: Fri, 11 Jan 2002 15:54:56 -0700 To: Alfred Perlstein Cc: Nate Williams , Bakul Shah , Dan Eischen , arch@FreeBSD.ORG Subject: Re: Request for review: getcontext, setcontext, etc In-Reply-To: <20020111145159.N7984@elvis.mu.org> References: <3C37E559.B011DF29@vigrid.com> <200201112141.QAA25529@devonshire.cnchost.com> <15423.27120.926839.725176@caddis.yogotech.com> <20020111145159.N7984@elvis.mu.org> X-Mailer: VM 6.96 under 21.1 (patch 14) "Cuyahoga Valley" XEmacs Lucid Reply-To: nate@yogotech.com (Nate Williams) Sender: owner-freebsd-arch@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG > > The point is that this may not be a valid assumption w/regard to the FPU > > state. The necessity of saving/restoring the FPU state *IS* the primary > > subject of the the entire discussion, with the secondary part being that > > x86 hardware is broken, so it may not be possible to guarantee delivery > > of FPU exceptions to the same context that caused it. > > Couldn't this just be simply done by calling the "wait for fop to > complete" instruction before switching out an FP using thread? According to Bruce, this is broken, since this is what 'fsave' does. Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message