Messages in this thread | | | Date | Wed, 6 Feb 2002 16:15:11 -0500 | From | Jakub Jelinek <> | Subject | Re: kernel: ldt allocation failed |
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On Wed, Feb 06, 2002 at 12:19:37PM -0800, H. Peter Anvin wrote: > Followup to: <20020206101231.X21624@devserv.devel.redhat.com> > By author: Jakub Jelinek <jakub@redhat.com> > In newsgroup: linux.dev.kernel > > > > Most sane architectures reserve a thread pointer register (%g6 resp. %g7 on > > sparc, tp on ia64, ppc will use %r2, alpha uses a fast pall call as thread > > "register", s390 uses user access register 0 (and s390x uar 0 and 1), etc.). > > On register starved ia32 there aren't too many spare registers, so %gs is > > used instead. > > > > x86-64, interestingly, retains vestigial meaning of the %fs and %gs > registers (but no others) to use as a base pointer for this reason > alone.
Well, on x86-64 this is purely x86-64 ABI designers decision, they could pick one of %r8 - %r15 and use that as thread pointer instead (and were recommended to do so).
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