PSW_B
#define USER_PSW_MASK (WIDE_PSW | PSW_T | PSW_N | PSW_X | PSW_B | PSW_V | PSW_CB)
#define USER_PSW_BITS (PSW_N | PSW_B | PSW_V | PSW_CB)
regs->gr[0] &= ~PSW_B;
regs->gr[0] &= ~PSW_B; /* IPSW in gr[0] */