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Annotation of 43BSDTahoe/sys/tahoealign/Asbwc.c, revision 1.1

1.1     ! root        1: /*     Asbwc.c 1.1     86/07/20        */
        !             2: 
        !             3: 
        !             4: #include "../tahoealign/align.h" 
        !             5: sbwc(infop)    process_info *infop;
        !             6: /*
        !             7: /*     Subtract with carry.
        !             8: /*     Note : the play with 'tmp' just before the 'asm' line makes
        !             9: /*             sure that when the sbwc opcode is executed, the current
        !            10: /*             carry in psl is the same as the 'offending' process'.
        !            11: /*             Don't change unless you know exactly what you're doing.
        !            12: /*
        !            13: /*****************************/
        !            14: {
        !            15:        register        long    Register_12;    /* Has to be first reg ! */
        !            16:        register        long    Register_11;
        !            17:        register        long    Register_10;
        !            18:        register        long    tmp;
        !            19: 
        !            20:        Register_12 = operand(infop,0)->data;
        !            21:        Register_11 = operand(infop,1)->data;
        !            22:        if (carry)      /* If process' carry set */
        !            23:                tmp = -1;
        !            24:        else tmp = 0;
        !            25:        tmp++;          /* 0 => carry set.  1 => carry clear */
        !            26: 
        !            27:        Register_10=psl;
        !            28:        Set_psl(r10);   /* restore the user psl */
        !            29:        asm("   sbwc    r12,r11");
        !            30:        asm("   movpsl  r12");
        !            31:        New_cc (Register_12);
        !            32: 
        !            33:        write_back(infop, Register_11, operand(infop,1) );
        !            34: }

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