Re: [Xen-devel] NPTL/TLS segment flipping code problem

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>Your analysis of these opcodes (A1 and A3) is correct, but both have
>code 'O|4' in the insn_decode table, so they don't go thru 'case 1:'.

>
>A0 and A2 have code 'O|1' which are instructions:
> MOV moffs8,AL   ;   MOV AL,moffs8
>These have a single-byte offset incoded within the instruction.
>The 'case 1:' *is* needed for A0 and A2.

Hmm, I'm sorry, I actually meant A0 and A2. Just look at what the
assembler generates for 

        movb    symbol, %al
        movb    %al, symbol

(gas -al=movb.l -o movb.o movb.s):

GAS LISTING movb.s                      page 1


   1 0000 A0000000              movb    symbol, %al
   1      00
   2 0005 A2000000              movb    %al, symbol
   2      00

Jan



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