usr/include/sys/psl.h

/*
        VAX program status longword
 */

#define PSL_C 0x1               /* carry bit */
#define PSL_V 0x2               /* overflow bit */
#define PSL_Z 0x4               /* zero bit */
#define PSL_N 0x8               /* negative bit */
#define PSL_T 0x10              /* trace enable bit */
#define PSL_IV 0x20             /* integer overflow enable bit */
#define PSL_FU 0x40             /* floating point underflow enable bit */
#define PSL_DV 0x80             /* decimal overflow enable bit */
#define PSL_IPL 0x1f0000        /* interrupt priority level */
#define PSL_PRVMOD 0xc00000     /* previous mode */
#define PSL_CURMOD 0x3000000    /* current mode */
#define PSL_IS 0x4000000        /* interrupt stack */
#define PSL_FPD 0x8000000       /* first part done */
#define PSL_TP 0x40000000       /* trace pending */
#define PSL_CM 0x80000000       /* compatibility mode */