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Annotation of cci/sys/tahoe/Asbwc.c, revision 1.1

1.1     ! root        1: 
        !             2: #include "../machine/alignment.h" 
        !             3: sbwc(infop)    process_info *infop;
        !             4: /*
        !             5: /*     Subtract with carry.
        !             6: /*     Note : the play with 'tmp' just before the 'asm' line makes
        !             7: /*             sure that when the sbwc opcode is executed, the current
        !             8: /*             carry in psl is the same as the 'offending' process'.
        !             9: /*             Don't change unless you know exactly what you're doing.
        !            10: /*
        !            11: /*****************************/
        !            12: {
        !            13:        register        long    Register_12;    /* Has to be first reg ! */
        !            14:        register        long    Register_11;
        !            15:        register        long    Register_10;
        !            16:        register        long    tmp;
        !            17: 
        !            18:        Register_12 = operand(infop,0)->data;
        !            19:        Register_11 = operand(infop,1)->data;
        !            20:        if (carry)      /* If process' carry set */
        !            21:                tmp = -1;
        !            22:        else tmp = 0;
        !            23:        tmp++;          /* 0 => carry set.  1 => carry clear */
        !            24: 
        !            25:        Register_10=psl;
        !            26:        Set_psl(r10);   /* restore the user psl */
        !            27:        asm("   sbwc    r12,r11");
        !            28:        asm("   movpsl  r12");
        !            29:        New_cc (Register_12);
        !            30: 
        !            31:        write_back(infop, Register_11, operand(infop,1) );
        !            32: }

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