TBR               704 arch/powerpc/xmon/ppc-opc.c #define TO TBR + 2
TBR              5245 arch/powerpc/xmon/ppc-opc.c {"mftb",	X(31,339),	  X_MASK,    POWER4|BOOKE, 0,		{RT, TBR}},
TBR              5418 arch/powerpc/xmon/ppc-opc.c {"mftb",	X(31,371),	X_MASK,	     PPC,	NO371|POWER4,	{RT, TBR}},