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