Messages in this thread | | | Date | Mon, 28 Aug 2006 10:51:00 +0100 | From | "Jan Beulich" <> | Subject | Re: [PATCH RFC 3/6] Use %gs as the PDA base-segment in the kernel. |
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>>> Andi Kleen <ak@suse.de> 27.08.06 20:19 >>> >On Sunday 27 August 2006 19:20, Jeremy Fitzhardinge wrote: >> Andi Kleen wrote: >> >> +1: movw GS(%esp), %gs >> >> >> > >> > movl is recommended in 32bit mode >> > >> >> arch/i386/kernel/entry.S: Assembler messages: >> arch/i386/kernel/entry.S:334: Error: suffix or operands invalid for `mov' > >Looks like a gas bug to me.
This was an intentional change (by H.J. if I recall right) as using movl with segment registers gives the incorrect impression that one gets a 32-bit memory access (especially for stores this is important, since there's really nothing stored to the upper 16 bits). One should always use suffix-less 'mov' for segment register accesses.
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