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
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