Messages in this thread | | | From | "H. Peter Anvin" <> | Subject | Re: kernel: ldt allocation failed | Date | 6 Feb 2002 12:19:37 -0800 |
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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.
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