From owner-freebsd-hackers Fri Apr 3 08:23:16 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id IAA24480 for freebsd-hackers-outgoing; Fri, 3 Apr 1998 08:23:16 -0800 (PST) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from att.com (cagw1.att.com [192.128.52.89]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id IAA24461 for ; Fri, 3 Apr 1998 08:23:10 -0800 (PST) (envelope-from sbabkin@dcn.att.com) From: sbabkin@dcn.att.com Received: by cagw1.att.com; Fri Apr 3 11:15 EST 1998 Received: from dcn71.dcn.att.com ([135.44.192.112]) by caig1.att.att.com (AT&T/GW-1.0) with ESMTP id LAA22581 for ; Fri, 3 Apr 1998 11:22:36 -0500 (EST) Received: by dcn71.dcn.att.com with Internet Mail Service (5.0.1458.49) id <2BJ2JFV0>; Fri, 3 Apr 1998 11:27:39 -0500 Message-ID: To: karpen@ocean.campus.luth.se, nate@mt.sri.com Cc: marquard@zilker.net, freebsd-hackers@FreeBSD.ORG Subject: RE: bcopy implementation Date: Fri, 3 Apr 1998 11:27:37 -0500 X-Priority: 3 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.0.1458.49) Content-Type: text/plain Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > ---------- > From: Nate Williams[SMTP:nate@mt.sri.com] > > People seem to be forgetting that since bcopy isn't a system call, > it's > possible to royally screw yourself up with it, since it uses the FP > registers. > > So, one program could be in the middle of doing a bcopy, and a second > program could interrupt it, and spam the registers of the previous > program, so that when the first was resume it's results are totally > bogus. > Huh ? The floating point registers must be saved as part of context or else no program using them will work properly. Serge Babkin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message