From owner-freebsd-current Mon May 7 4:52:24 2001 Delivered-To: freebsd-current@freebsd.org Received: from pcnet1.pcnet.com (pcnet1.pcnet.com [204.213.232.3]) by hub.freebsd.org (Postfix) with ESMTP id 0940637B422 for ; Mon, 7 May 2001 04:52:21 -0700 (PDT) (envelope-from eischen@vigrid.com) Received: (from eischen@localhost) by pcnet1.pcnet.com (8.8.7/PCNet) id HAA28271; Mon, 7 May 2001 07:51:40 -0400 (EDT) Date: Mon, 7 May 2001 07:51:40 -0400 (EDT) From: Daniel Eischen To: Bruce Evans Cc: Andrew Gallatin , current@FreeBSD.ORG Subject: Re: Rfork'd threads, signals, and LDTs In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Mon, 7 May 2001, Bruce Evans wrote: > On Sat, 5 May 2001, Daniel Eischen wrote: > > > On Sat, 5 May 2001, Andrew Gallatin wrote: > > > > > > Daniel Eischen writes: > > > > > > > > OK, thanks. Here's my guess at what should be changed for the Linux > > > > emulator. If this looks correct, I'll commit it. > > > > > > > > Hmm, I wonder how linuxthreads works under FreeBSD without this > > > > change... > > > > > > This breaks at least one version of the IBM JDK that I have > > > laying around.. > > > > > > If anything, we may have two errors (at least partially) canceling > > > each other out. I think it needs more work/thought prior to > > > committing. > > > > We're still OK with the change to FreeBSDs native signal trampoline > > though, right? I'll hold off on the Linux emulator changes until > > we can figure out what the problem is. > > I was confused about what Linux does. Now I think it only copies %fs > to the signal context struct. It loads %fs with USER_DS for the signal > handler. It passes the previous (process) value of %gs to the signal > handler. (Its early mistake of of switching %fs on every entry to the > kernel was moved to FreeBSD.) I think the only reason we used %fs instead of %gs was WINE. I think Linux uses %gs for TSD, so if WINE were to ever depend on linuxthreads, one of them would have to change. We can easily switch to using %gs instead of %fs if necessary. I'll make the appropriate change to the Linux emulator. Thanks -- Dan Eischen To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message