2600: /*
2601:  * Location of the users' stored
2602:  * registers relative to R0.
2603:  * Usage is u.u_ar0[XX].
2604:  */
2605: #define R0      (0)
2606: #define R1      (-2)
2607: #define R2      (-9)
2608: #define R3      (-8)
2609: #define R4      (-7)
2610: #define R5      (-6)
2611: #define R6      (-3)
2612: #define R7      (1)
2613: #define RPS     (2)
2614: 
2615: #define TBIT    020             /* PS trace bit */