* configure.tgt (powerpc64-*-linux*): Enable gdbserver.
	* regformats/reg-ppc64.dat: New file.
gdbserver/
	* Makefile.in (SFILES): Add linux-ppc64-low.c.
	(linux-ppc64-low.o, reg-ppc64.c, reg-ppc64.o): New targets.
	* configure.srv: Add powerpc64-*-linux*.
	* linux-ppc64-low.c: New file.