$ cat opcodes/ppc-opc.c | grep -C 3 -E "define (BF|BFA|BA|BB|BC|BI|BT) "

  /* The BF field in an X or XL form instruction.  */
#define BF BDPA + 1
  /* The CRFD field in an X form instruction.  */
#define CRFD BF
  /* The CRD field in an XL form instruction.  */
#define CRD BF
  { 0x7, 23, NULL, NULL, PPC_OPERAND_CR_REG },

  /* The BFA field in an X or XL form instruction.  */
#define BFA OBF + 1
  { 0x7, 18, NULL, NULL, PPC_OPERAND_CR_REG },

  /* The BA field in an XL form instruction.  */
#define BA UNUSED + 1
#define BI BA
#define BI_MASK (0x1f << 16)
  { 0x1f, 16, NULL, NULL, PPC_OPERAND_CR_BIT },

  /* The BB field in an XL form instruction.  */
#define BB BTAB + 1
#define BB_MASK (0x1f << 11)
  { 0x1f, 11, NULL, NULL, PPC_OPERAND_CR_BIT },

  /* The CRB field in an X form instruction.  */
#define BC CRB /* ghostmansd: custom mapping */
#define CRB CR + 1
  /* The MB field in an M form instruction.  */
#define MB CRB
#define MB_MASK (0x1f << 6)
  { 0x1f, 6, NULL, NULL, 0 },

  /* The BT field in an X or XL form instruction.  */
#define BT BH + 1
  { 0x1f, 21, NULL, NULL, PPC_OPERAND_CR_BIT },