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122 lines
1.8 KiB
122 lines
1.8 KiB
/*[
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cmpxchg.c
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LOCAL CHAR SccsID[]="@(#)cmpxchg.c 1.5 02/09/94";
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CMPXCHG 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 <cmpxchg.h>
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#include <cmp.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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#ifdef SPC486
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GLOBAL VOID
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CMPXCHG8
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IFN2(
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IU32 *, pop1, /* pntr to dst/lsrc operand */
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IU32, op2 /* rsrc operand */
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)
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{
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/*
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First do comparision and generate flags.
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*/
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CMP((IU32)GET_AL(), *pop1, 8);
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/*
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Then swap data as required.
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*/
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if ( GET_ZF() ) /* ie iff AL == op1 */
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{
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*pop1 = op2;
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}
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else
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{
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SET_AL(*pop1);
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}
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}
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GLOBAL VOID
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CMPXCHG16
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IFN2(
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IU32 *, pop1, /* pntr to dst/lsrc operand */
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IU32, op2 /* rsrc operand */
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)
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{
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/*
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First do comparision and generate flags.
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*/
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CMP((IU32)GET_AX(), *pop1, 16);
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/*
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Then swap data as required.
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*/
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if ( GET_ZF() ) /* ie iff AX == op1 */
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{
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*pop1 = op2;
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}
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else
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{
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SET_AX(*pop1);
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}
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}
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GLOBAL VOID
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CMPXCHG32
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IFN2(
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IU32 *, pop1, /* pntr to dst/lsrc operand */
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IU32, op2 /* rsrc operand */
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)
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{
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/*
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First do comparision and generate flags.
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*/
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CMP((IU32)GET_EAX(), *pop1, 32);
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/*
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Then swap data as required.
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*/
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if ( GET_ZF() ) /* ie iff EAX == op1 */
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{
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*pop1 = op2;
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}
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else
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{
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SET_EAX(*pop1);
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}
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}
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#endif /* SPC486 */
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