File:reg.h - ikarishinjieva/unixV6-code-analyze-chs GitHub Wiki
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 */
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