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Date:      Sun, 23 Jul 2006 18:31:27 +0200
From:      Tijl Coosemans <tijl@ulyssis.org>
To:        freebsd-hackers@freebsd.org
Cc:        Daniel Eischen <deischen@freebsd.org>, Divacky Roman <xdivac02@stud.fit.vutbr.cz>, kmacy@fsmware.com, freebsd-emulation@freebsd.org, Michael Nottebrock <lofi@freebsd.org>
Subject:   Re: WINE vs. FreeBSD
Message-ID:  <200607231831.32410.tijl@ulyssis.org>
In-Reply-To: <20060723091824.GA79726@stud.fit.vutbr.cz>
References:  <200607221914.15826.lofi@freebsd.org> <Pine.GSO.4.64.0607221912140.4394@sea.ntplx.net> <20060723091824.GA79726@stud.fit.vutbr.cz>

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On Sunday 23 July 2006 11:18, Divacky Roman wrote:
> On Sat, Jul 22, 2006 at 07:15:35PM -0400, Daniel Eischen wrote:
> > I think it is because WINE stomps on or TLS. =A0Nothing we can
> > do about that except patch wine so it doesn't. =A0Look at the
> > console messages for:
> >
> > =A0 Warning: pid XXX used static ldt allocation

Wine's LDT code could probably be improved to bring in LDT_AUTO_ALLOC=20
and/or use the GDT entry for %fs through i386_set_fsbase() for TLS=20
instead of allocating an LDT entry (per thread). But, I don't think=20
this is currently a problem. As far as I can see FreeBSD's TLS support=20
doesn't use the LDT (anymore) so wine's static ldt allocation can't=20
possibly interfere with it.

> I dont know details but judging from what linux does I think it might
> be that wine requires more then one GDT entry for TLS areas. at least
> comment in linux sources suggests so.
>
> linux has 3 GDT entries for TLS while fbsd just 1.

Wine on FreeBSD doesn't use the GDT (yet?). It allocates LDT entries for=20
TLS which should work just as well.

In any case, FreeBSD and Linux don't differ that much in this.

=46reeBSD has 2 GDT entries available, one for %gs which is used by the=20
threading libs (following http://people.redhat.com/drepper/tls.pdf I=20
suppose) and one for %fs which is used by win32 code so wine could use=20
this instead of the LDT way. The related (undocumented) libc functions=20
are i386_get_fsbase, i386_set_fsbase, i386_get_gsbase and=20
i386_set_gsbase.

Linux reserves 3 GDT entries, that can be manipulated through one=20
syscall (set_thread_area) and then it's up to the user to point %fs=20
or %gs (or some other selector?) to one of these entries.

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