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Annotation of cci/sys/tahoe/Aadwc.c, revision 1.1.1.1

1.1       root        1: #include "../machine/alignment.h" 
                      2: adwc(infop)    process_info *infop;
                      3: /*
                      4: /*     Add with carry.
                      5: /*     Note : the play with 'tmp' just before the 'asm' line makes
                      6: /*             sure that when the adwc opcode is executed, the current
                      7: /*             carry in psl is the same as the 'offending' process'.
                      8: /*             Don't change unless you know exactly what you're doing.
                      9: /*
                     10: /*****************************/
                     11: {
                     12:        register        long    Register_12;    /* Has to be first reg ! */
                     13:        register        long    Register_11;
                     14:        register        long    Register_10;
                     15:        register        long    tmp;
                     16: 
                     17:        Register_12 = operand(infop,0)->data;
                     18:        Register_11 = operand(infop,1)->data;
                     19:        if (carry)      /* If process' carry set */
                     20:                tmp = -1;
                     21:        else tmp = 0;
                     22:        tmp++;          /* 0 => carry set.  1 => carry clear */
                     23: 
                     24:        Register_10=psl;
                     25:        Set_psl(r10);   /* restore the user psl */
                     26:        asm("   adwc    r11,r12");
                     27:        asm("   movpsl  r11");
                     28:        New_cc (Register_11);
                     29: 
                     30:        write_back(infop, Register_12, operand(infop,1) );
                     31: }

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