Return to Asbwc.c CVS log

Up to [Power 6/32 Unix Tahoe 4.2BSD] / cci / sys / tahoe

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

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: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.