[Consult] cris: arch-v10: About $dtp0 register

[Chen Gang]

Hello Maintainers:

I want to consult, whether arch-v10 supports $dtp0 register:

 - Kernel has already used it in arch/cris/arch-v10/kernel/kgdb.c.

 - But upstream gas 2.25.51 can not recognize it for arch-v10, for the
   same kgdb.s file which contents $dtp0:

     "/upstream/release-cris/bin/cris-gchen-linux-as ./kgdb.s -o kgdb.o" will be ok.
     "/upstream/release-cris/bin/cris-gchen-linux-as --march=v10 ./kgdb.s -o kgdb.o" will cause "Error: Illegal operands".

For me, I guess, it is upstream toolchain's issue, but I have no the
related ISA documentations (common ISA and v10 special ISA), so at
present I can not be sure about it (related informations are welcomed).

And after this issue, excluding warnings, the cris next-20150702 can
pass allmodconfig with the current latest upstream master branch
toolchain. :-)


Welcome any ideas, suggestions and completions.

Thanks.
-- 
Chen Gang

Open, share, and attitude like air, water, and life which God blessed
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