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Annotation of researchv10dc/cmd/icon/setup/sun/rswitch.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * This is the co-expression context switch for the Sun Workstation
                      3:  * operating under Berkley 4.2bsd UNIX.
                      4:  */
                      5: 
                      6: /*
                      7:  * coswitch
                      8:  */
                      9: coswitch(old_cs, new_cs, first)
                     10: int *old_cs, *new_cs;
                     11: int first;
                     12: {
                     13:    asm("  movl a6@(8),a0");            /* a0 = old */
                     14:    asm("  movl a6@(12),a1");           /* a1 = new */
                     15:    asm("  movl a7,a0@");               /* save sp in cstate[0] */
                     16:    asm("  movl a6,a0@(4)");            /* save a6 (fp) in cstate[0] */
                     17:    asm("  moveml #0x3cfc,a0@(8)");     /* store d2-d7, a2-a6 in old->cstate */
                     18:    if (first == 0) {   /* this is first activation */
                     19:       asm("  movl a1@,a7");
                     20:       asm("  movl #0,a6");
                     21:       interp(0, 0);
                     22:       syserr("interp() returned in coswitch");
                     23:       }
                     24:    else {
                     25:       asm(" movl a1@,a7");             /* restore sp */
                     26:       asm(" movl a1@(4),a6");          /* restore fp */
                     27:       asm(" moveml a1@(8),#0x3cfc");   /* restore d2-d7, a2-a6 */
                     28:       }
                     29: }

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