Messages in this thread |  | | From | Andi Kleen <> | | Subject | Re: FOR REVIEW: New x86-64 vsyscall vgetcpu() | | Date | Fri, 16 Jun 2006 18:24:52 +0200 |
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On Friday 16 June 2006 17:58, Jakub Jelinek wrote: > On Fri, Jun 16, 2006 at 05:37:06PM +0200, Andi Kleen wrote: > > On Friday 16 June 2006 17:31, Zoltan Menyhart wrote: > > > Andi Kleen wrote: > > > > > > > That is not how user space TLS works. It usually has a base a register. > > > > > > Can you please give me a real life (simplified) example? > > > > On x86-64 it's just %fs:offset. gcc is a bit dumb on this and usually > > loads the base address from %fs:0 first. > > GCC is not dumb, unless you force it with -mno-tls-direct-seg-refs. > Guess you are bitten by SUSE GCC hack which makes -mno-tls-direct-seg-refs > the default (especially on x86-64 it is a really bad idea).
I apparently got indeed.
I wonder why it happened on x86-64 though - i thought there were no negative offsets on x86-64 TLS.
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