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/*[
cmpxchg.c
LOCAL CHAR SccsID[]="@(#)cmpxchg.c 1.5 02/09/94";
CMPXCHG CPU functions.
----------------------
]*/
#include <insignia.h>
#include <host_def.h>
#include <xt.h>
#include <c_main.h>
#include <c_addr.h>
#include <c_bsic.h>
#include <c_prot.h>
#include <c_seg.h>
#include <c_stack.h>
#include <c_xcptn.h>
#include <c_reg.h>
#include <cmpxchg.h>
#include <cmp.h>
/*
=====================================================================
EXTERNAL FUNCTIONS START HERE.
=====================================================================
*/
#ifdef SPC486
GLOBAL VOID
CMPXCHG8
IFN2(
IU32 *, pop1, /* pntr to dst/lsrc operand */
IU32, op2 /* rsrc operand */
)
{
/*
First do comparision and generate flags.
*/
CMP((IU32)GET_AL(), *pop1, 8);
/*
Then swap data as required.
*/
if ( GET_ZF() ) /* ie iff AL == op1 */
{
*pop1 = op2;
}
else
{
SET_AL(*pop1);
}
}
GLOBAL VOID
CMPXCHG16
IFN2(
IU32 *, pop1, /* pntr to dst/lsrc operand */
IU32, op2 /* rsrc operand */
)
{
/*
First do comparision and generate flags.
*/
CMP((IU32)GET_AX(), *pop1, 16);
/*
Then swap data as required.
*/
if ( GET_ZF() ) /* ie iff AX == op1 */
{
*pop1 = op2;
}
else
{
SET_AX(*pop1);
}
}
GLOBAL VOID
CMPXCHG32
IFN2(
IU32 *, pop1, /* pntr to dst/lsrc operand */
IU32, op2 /* rsrc operand */
)
{
/*
First do comparision and generate flags.
*/
CMP((IU32)GET_EAX(), *pop1, 32);
/*
Then swap data as required.
*/
if ( GET_ZF() ) /* ie iff EAX == op1 */
{
*pop1 = op2;
}
else
{
SET_EAX(*pop1);
}
}
#endif /* SPC486 */
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