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66 lines
1.4 KiB
66 lines
1.4 KiB
/*[
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inc.c
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LOCAL CHAR SccsID[]="@(#)inc.c 1.5 02/09/94";
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INC CPU functions.
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------------------
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]*/
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#include <insignia.h>
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#include <host_def.h>
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#include <xt.h>
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#include <c_main.h>
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#include <c_addr.h>
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#include <c_bsic.h>
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#include <c_prot.h>
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#include <c_seg.h>
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#include <c_stack.h>
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#include <c_xcptn.h>
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#include <c_reg.h>
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#include <inc.h>
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/*
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=====================================================================
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EXTERNAL FUNCTIONS START HERE.
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=====================================================================
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*/
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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/* Generic - one size fits all 'inc'. */
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/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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GLOBAL VOID
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INC
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IFN2(
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IU32 *, pop1, /* pntr to dst/src operand */
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IUM8, op_sz /* 8, 16 or 32-bit */
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)
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{
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IU32 result;
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IU32 msb;
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IU32 op1_msb;
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IU32 res_msb;
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msb = SZ2MSB(op_sz);
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result = *pop1 + 1 & SZ2MASK(op_sz); /* Do operation */
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op1_msb = (*pop1 & msb) != 0; /* Isolate all msb's */
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res_msb = (result & msb) != 0;
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/* Determine flags */
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SET_OF(!op1_msb & res_msb); /* OF = !op1 & res */
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/* CF left unchanged */
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SET_PF(pf_table[result & BYTE_MASK]);
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SET_ZF(result == 0);
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SET_SF((result & msb) != 0); /* SF = MSB */
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SET_AF(((*pop1 ^ result) & BIT4_MASK) != 0); /* AF = Bit 4 carry */
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*pop1 = result; /* Return answer */
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}
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