arch/arm/nwfpe/fpa11_cpdt.c - kernel/skids - Git at Google

 /*
     NetWinder Floating Point Emulator
     (c) Rebel.com, 1998-1999
     (c) Philip Blundell, 1998, 2001

     Direct questions, comments to Scott Bambrough <scottb@netwinder.org>

     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
     (at your option) any later version.

     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

 #include "fpa11.h"
 #include "softfloat.h"
 #include "fpopcode.h"
 #include "fpmodule.h"
 #include "fpmodule.inl"

 #include <linux/uaccess.h>

 static inline void loadSingle(const unsigned int Fn, const unsigned int __user *pMem)
 {
 	FPA11 *fpa11 = GET_FPA11();
 	fpa11->fType[Fn] = typeSingle;
 	get_user(fpa11->fpreg[Fn].fSingle, pMem);
 }

 static inline void loadDouble(const unsigned int Fn, const unsigned int __user *pMem)
 {
 	FPA11 *fpa11 = GET_FPA11();
 	unsigned int *p;
 	p = (unsigned int *) &fpa11->fpreg[Fn].fDouble;
 	fpa11->fType[Fn] = typeDouble;
 #ifdef __ARMEB__
 	get_user(p[0], &pMem[0]);	/* sign & exponent */
 	get_user(p[1], &pMem[1]);
 #else
 	get_user(p[0], &pMem[1]);
 	get_user(p[1], &pMem[0]);	/* sign & exponent */
 #endif
 }

 #ifdef CONFIG_FPE_NWFPE_XP
 static inline void loadExtended(const unsigned int Fn, const unsigned int __user *pMem)
 {
 	FPA11 *fpa11 = GET_FPA11();
 	unsigned int *p;
 	p = (unsigned int *) &fpa11->fpreg[Fn].fExtended;
 	fpa11->fType[Fn] = typeExtended;
 	get_user(p[0], &pMem[0]);	/* sign & exponent */
 #ifdef __ARMEB__
 	get_user(p[1], &pMem[1]);	/* ms bits */
 	get_user(p[2], &pMem[2]);	/* ls bits */
 #else
 	get_user(p[1], &pMem[2]);	/* ls bits */
 	get_user(p[2], &pMem[1]);	/* ms bits */
 #endif
 }
 #endif

 static inline void loadMultiple(const unsigned int Fn, const unsigned int __user *pMem)
 {
 	FPA11 *fpa11 = GET_FPA11();
 	register unsigned int *p;
 	unsigned long x;

 	p = (unsigned int *) &(fpa11->fpreg[Fn]);
 	get_user(x, &pMem[0]);
 	fpa11->fType[Fn] = (x >> 14) & 0x00000003;

 	switch (fpa11->fType[Fn]) {
 	case typeSingle:
 	case typeDouble:
 		{
 			get_user(p[0], &pMem[2]);	/* Single */
 			get_user(p[1], &pMem[1]);	/* double msw */
 			p[2] = 0;			/* empty */
 		}
 		break;

 #ifdef CONFIG_FPE_NWFPE_XP
 	case typeExtended:
 		{
 			get_user(p[1], &pMem[2]);
 			get_user(p[2], &pMem[1]);	/* msw */
 			p[0] = (x & 0x80003fff);
 		}
 		break;
 #endif
 	}
 }

 static inline void storeSingle(struct roundingData *roundData, const unsigned int Fn, unsigned int __user *pMem)
 {
 	FPA11 *fpa11 = GET_FPA11();
 	union {
 		float32 f;
 		unsigned int i[1];
 	} val;

 	switch (fpa11->fType[Fn]) {
 	case typeDouble:
 		val.f = float64_to_float32(roundData, fpa11->fpreg[Fn].fDouble);
 		break;

 #ifdef CONFIG_FPE_NWFPE_XP
 	case typeExtended:
 		val.f = floatx80_to_float32(roundData, fpa11->fpreg[Fn].fExtended);
 		break;
 #endif

 	default:
 		val.f = fpa11->fpreg[Fn].fSingle;
 	}

 	put_user(val.i[0], pMem);
 }

 static inline void storeDouble(struct roundingData *roundData, const unsigned int Fn, unsigned int __user *pMem)
 {
 	FPA11 *fpa11 = GET_FPA11();
 	union {
 		float64 f;
 		unsigned int i[2];
 	} val;

 	switch (fpa11->fType[Fn]) {
 	case typeSingle:
 		val.f = float32_to_float64(fpa11->fpreg[Fn].fSingle);
 		break;

 #ifdef CONFIG_FPE_NWFPE_XP
 	case typeExtended:
 		val.f = floatx80_to_float64(roundData, fpa11->fpreg[Fn].fExtended);
 		break;
 #endif

 	default:
 		val.f = fpa11->fpreg[Fn].fDouble;
 	}

 #ifdef __ARMEB__
 	put_user(val.i[0], &pMem[0]);	/* msw */
 	put_user(val.i[1], &pMem[1]);	/* lsw */
 #else
 	put_user(val.i[1], &pMem[0]);	/* msw */
 	put_user(val.i[0], &pMem[1]);	/* lsw */
 #endif
 }

 #ifdef CONFIG_FPE_NWFPE_XP
 static inline void storeExtended(const unsigned int Fn, unsigned int __user *pMem)
 {
 	FPA11 *fpa11 = GET_FPA11();
 	union {
 		floatx80 f;
 		unsigned int i[3];
 	} val;

 	switch (fpa11->fType[Fn]) {
 	case typeSingle:
 		val.f = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
 		break;

 	case typeDouble:
 		val.f = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
 		break;

 	default:
 		val.f = fpa11->fpreg[Fn].fExtended;
 	}

 	put_user(val.i[0], &pMem[0]);	/* sign & exp */
 #ifdef __ARMEB__
 	put_user(val.i[1], &pMem[1]);	/* msw */
 	put_user(val.i[2], &pMem[2]);
 #else
 	put_user(val.i[1], &pMem[2]);
 	put_user(val.i[2], &pMem[1]);	/* msw */
 #endif
 }
 #endif

 static inline void storeMultiple(const unsigned int Fn, unsigned int __user *pMem)
 {
 	FPA11 *fpa11 = GET_FPA11();
 	register unsigned int nType, *p;

 	p = (unsigned int *) &(fpa11->fpreg[Fn]);
 	nType = fpa11->fType[Fn];

 	switch (nType) {
 	case typeSingle:
 	case typeDouble:
 		{
 			put_user(p[0], &pMem[2]);	/* single */
 			put_user(p[1], &pMem[1]);	/* double msw */
 			put_user(nType << 14, &pMem[0]);
 		}
 		break;

 #ifdef CONFIG_FPE_NWFPE_XP
 	case typeExtended:
 		{
 			put_user(p[2], &pMem[1]);	/* msw */
 			put_user(p[1], &pMem[2]);
 			put_user((p[0] & 0x80003fff) | (nType << 14), &pMem[0]);
 		}
 		break;
 #endif
 	}
 }

 unsigned int PerformLDF(const unsigned int opcode)
 {
 	unsigned int __user *pBase, *pAddress, *pFinal;
 	unsigned int nRc = 1, write_back = WRITE_BACK(opcode);

 	pBase = (unsigned int __user *) readRegister(getRn(opcode));
 	if (REG_PC == getRn(opcode)) {
 		pBase += 2;
 		write_back = 0;
 	}

 	pFinal = pBase;
 	if (BIT_UP_SET(opcode))
 		pFinal += getOffset(opcode);
 	else
 		pFinal -= getOffset(opcode);

 	if (PREINDEXED(opcode))
 		pAddress = pFinal;
 	else
 		pAddress = pBase;

 	switch (opcode & MASK_TRANSFER_LENGTH) {
 	case TRANSFER_SINGLE:
 		loadSingle(getFd(opcode), pAddress);
 		break;
 	case TRANSFER_DOUBLE:
 		loadDouble(getFd(opcode), pAddress);
 		break;
 #ifdef CONFIG_FPE_NWFPE_XP
 	case TRANSFER_EXTENDED:
 		loadExtended(getFd(opcode), pAddress);
 		break;
 #endif
 	default:
 		nRc = 0;
 	}

 	if (write_back)
 		writeRegister(getRn(opcode), (unsigned long) pFinal);
 	return nRc;
 }

 unsigned int PerformSTF(const unsigned int opcode)
 {
 	unsigned int __user *pBase, *pAddress, *pFinal;
 	unsigned int nRc = 1, write_back = WRITE_BACK(opcode);
 	struct roundingData roundData;

 	roundData.mode = SetRoundingMode(opcode);
 	roundData.precision = SetRoundingPrecision(opcode);
 	roundData.exception = 0;

 	pBase = (unsigned int __user *) readRegister(getRn(opcode));
 	if (REG_PC == getRn(opcode)) {
 		pBase += 2;
 		write_back = 0;
 	}

 	pFinal = pBase;
 	if (BIT_UP_SET(opcode))
 		pFinal += getOffset(opcode);
 	else
 		pFinal -= getOffset(opcode);

 	if (PREINDEXED(opcode))
 		pAddress = pFinal;
 	else
 		pAddress = pBase;

 	switch (opcode & MASK_TRANSFER_LENGTH) {
 	case TRANSFER_SINGLE:
 		storeSingle(&roundData, getFd(opcode), pAddress);
 		break;
 	case TRANSFER_DOUBLE:
 		storeDouble(&roundData, getFd(opcode), pAddress);
 		break;
 #ifdef CONFIG_FPE_NWFPE_XP
 	case TRANSFER_EXTENDED:
 		storeExtended(getFd(opcode), pAddress);
 		break;
 #endif
 	default:
 		nRc = 0;
 	}

 	if (roundData.exception)
 		float_raise(roundData.exception);

 	if (write_back)
 		writeRegister(getRn(opcode), (unsigned long) pFinal);
 	return nRc;
 }

 unsigned int PerformLFM(const unsigned int opcode)
 {
 	unsigned int __user *pBase, *pAddress, *pFinal;
 	unsigned int i, Fd, write_back = WRITE_BACK(opcode);

 	pBase = (unsigned int __user *) readRegister(getRn(opcode));
 	if (REG_PC == getRn(opcode)) {
 		pBase += 2;
 		write_back = 0;
 	}

 	pFinal = pBase;
 	if (BIT_UP_SET(opcode))
 		pFinal += getOffset(opcode);
 	else
 		pFinal -= getOffset(opcode);

 	if (PREINDEXED(opcode))
 		pAddress = pFinal;
 	else
 		pAddress = pBase;

 	Fd = getFd(opcode);
 	for (i = getRegisterCount(opcode); i > 0; i--) {
 		loadMultiple(Fd, pAddress);
 		pAddress += 3;
 		Fd++;
 		if (Fd == 8)
 			Fd = 0;
 	}

 	if (write_back)
 		writeRegister(getRn(opcode), (unsigned long) pFinal);
 	return 1;
 }

 unsigned int PerformSFM(const unsigned int opcode)
 {
 	unsigned int __user *pBase, *pAddress, *pFinal;
 	unsigned int i, Fd, write_back = WRITE_BACK(opcode);

 	pBase = (unsigned int __user *) readRegister(getRn(opcode));
 	if (REG_PC == getRn(opcode)) {
 		pBase += 2;
 		write_back = 0;
 	}

 	pFinal = pBase;
 	if (BIT_UP_SET(opcode))
 		pFinal += getOffset(opcode);
 	else
 		pFinal -= getOffset(opcode);

 	if (PREINDEXED(opcode))
 		pAddress = pFinal;
 	else
 		pAddress = pBase;

 	Fd = getFd(opcode);
 	for (i = getRegisterCount(opcode); i > 0; i--) {
 		storeMultiple(Fd, pAddress);
 		pAddress += 3;
 		Fd++;
 		if (Fd == 8)
 			Fd = 0;
 	}

 	if (write_back)
 		writeRegister(getRn(opcode), (unsigned long) pFinal);
 	return 1;
 }

 unsigned int EmulateCPDT(const unsigned int opcode)
 {
 	unsigned int nRc = 0;

 	if (LDF_OP(opcode)) {
 		nRc = PerformLDF(opcode);
 	} else if (LFM_OP(opcode)) {
 		nRc = PerformLFM(opcode);
 	} else if (STF_OP(opcode)) {
 		nRc = PerformSTF(opcode);
 	} else if (SFM_OP(opcode)) {
 		nRc = PerformSFM(opcode);
 	} else {
 		nRc = 0;
 	}

 	return nRc;
 }
	/*
	NetWinder Floating Point Emulator
	(c) Rebel.com, 1998-1999
	(c) Philip Blundell, 1998, 2001

	Direct questions, comments to Scott Bambrough <scottb@netwinder.org>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*/

	#include "fpa11.h"
	#include "softfloat.h"
	#include "fpopcode.h"
	#include "fpmodule.h"
	#include "fpmodule.inl"

	#include <linux/uaccess.h>

	static inline void loadSingle(const unsigned int Fn, const unsigned int __user *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	fpa11->fType[Fn] = typeSingle;
	get_user(fpa11->fpreg[Fn].fSingle, pMem);
	}

	static inline void loadDouble(const unsigned int Fn, const unsigned int __user *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	unsigned int *p;
	p = (unsigned int *) &fpa11->fpreg[Fn].fDouble;
	fpa11->fType[Fn] = typeDouble;
	#ifdef __ARMEB__
	get_user(p[0], &pMem[0]); /* sign & exponent */
	get_user(p[1], &pMem[1]);
	#else
	get_user(p[0], &pMem[1]);
	get_user(p[1], &pMem[0]); /* sign & exponent */
	#endif
	}

	#ifdef CONFIG_FPE_NWFPE_XP
	static inline void loadExtended(const unsigned int Fn, const unsigned int __user *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	unsigned int *p;
	p = (unsigned int *) &fpa11->fpreg[Fn].fExtended;
	fpa11->fType[Fn] = typeExtended;
	get_user(p[0], &pMem[0]); /* sign & exponent */
	#ifdef __ARMEB__
	get_user(p[1], &pMem[1]); /* ms bits */
	get_user(p[2], &pMem[2]); /* ls bits */
	#else
	get_user(p[1], &pMem[2]); /* ls bits */
	get_user(p[2], &pMem[1]); /* ms bits */
	#endif
	}
	#endif

	static inline void loadMultiple(const unsigned int Fn, const unsigned int __user *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	register unsigned int *p;
	unsigned long x;

	p = (unsigned int *) &(fpa11->fpreg[Fn]);
	get_user(x, &pMem[0]);
	fpa11->fType[Fn] = (x >> 14) & 0x00000003;

	switch (fpa11->fType[Fn]) {
	case typeSingle:
	case typeDouble:
	{
	get_user(p[0], &pMem[2]); /* Single */
	get_user(p[1], &pMem[1]); /* double msw */
	p[2] = 0; /* empty */
	}
	break;

	#ifdef CONFIG_FPE_NWFPE_XP
	case typeExtended:
	{
	get_user(p[1], &pMem[2]);
	get_user(p[2], &pMem[1]); /* msw */
	p[0] = (x & 0x80003fff);
	}
	break;
	#endif
	}
	}

	static inline void storeSingle(struct roundingData roundData, const unsigned int Fn, unsigned int __user pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	union {
	float32 f;
	unsigned int i[1];
	} val;

	switch (fpa11->fType[Fn]) {
	case typeDouble:
	val.f = float64_to_float32(roundData, fpa11->fpreg[Fn].fDouble);
	break;

	#ifdef CONFIG_FPE_NWFPE_XP
	case typeExtended:
	val.f = floatx80_to_float32(roundData, fpa11->fpreg[Fn].fExtended);
	break;
	#endif

	default:
	val.f = fpa11->fpreg[Fn].fSingle;
	}

	put_user(val.i[0], pMem);
	}

	static inline void storeDouble(struct roundingData roundData, const unsigned int Fn, unsigned int __user pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	union {
	float64 f;
	unsigned int i[2];
	} val;

	switch (fpa11->fType[Fn]) {
	case typeSingle:
	val.f = float32_to_float64(fpa11->fpreg[Fn].fSingle);
	break;

	#ifdef CONFIG_FPE_NWFPE_XP
	case typeExtended:
	val.f = floatx80_to_float64(roundData, fpa11->fpreg[Fn].fExtended);
	break;
	#endif

	default:
	val.f = fpa11->fpreg[Fn].fDouble;
	}

	#ifdef __ARMEB__
	put_user(val.i[0], &pMem[0]); /* msw */
	put_user(val.i[1], &pMem[1]); /* lsw */
	#else
	put_user(val.i[1], &pMem[0]); /* msw */
	put_user(val.i[0], &pMem[1]); /* lsw */
	#endif
	}

	#ifdef CONFIG_FPE_NWFPE_XP
	static inline void storeExtended(const unsigned int Fn, unsigned int __user *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	union {
	floatx80 f;
	unsigned int i[3];
	} val;

	switch (fpa11->fType[Fn]) {
	case typeSingle:
	val.f = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
	break;

	case typeDouble:
	val.f = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
	break;

	default:
	val.f = fpa11->fpreg[Fn].fExtended;
	}

	put_user(val.i[0], &pMem[0]); /* sign & exp */
	#ifdef __ARMEB__
	put_user(val.i[1], &pMem[1]); /* msw */
	put_user(val.i[2], &pMem[2]);
	#else
	put_user(val.i[1], &pMem[2]);
	put_user(val.i[2], &pMem[1]); /* msw */
	#endif
	}
	#endif

	static inline void storeMultiple(const unsigned int Fn, unsigned int __user *pMem)
	{
	FPA11 *fpa11 = GET_FPA11();
	register unsigned int nType, *p;

	p = (unsigned int *) &(fpa11->fpreg[Fn]);
	nType = fpa11->fType[Fn];

	switch (nType) {
	case typeSingle:
	case typeDouble:
	{
	put_user(p[0], &pMem[2]); /* single */
	put_user(p[1], &pMem[1]); /* double msw */
	put_user(nType << 14, &pMem[0]);
	}
	break;

	#ifdef CONFIG_FPE_NWFPE_XP
	case typeExtended:
	{
	put_user(p[2], &pMem[1]); /* msw */
	put_user(p[1], &pMem[2]);
	put_user((p[0] & 0x80003fff) \| (nType << 14), &pMem[0]);
	}
	break;
	#endif
	}
	}

	unsigned int PerformLDF(const unsigned int opcode)
	{
	unsigned int __user pBase, pAddress, *pFinal;
	unsigned int nRc = 1, write_back = WRITE_BACK(opcode);

	pBase = (unsigned int __user *) readRegister(getRn(opcode));
	if (REG_PC == getRn(opcode)) {
	pBase += 2;
	write_back = 0;
	}

	pFinal = pBase;
	if (BIT_UP_SET(opcode))
	pFinal += getOffset(opcode);
	else
	pFinal -= getOffset(opcode);

	if (PREINDEXED(opcode))
	pAddress = pFinal;
	else
	pAddress = pBase;

	switch (opcode & MASK_TRANSFER_LENGTH) {
	case TRANSFER_SINGLE:
	loadSingle(getFd(opcode), pAddress);
	break;
	case TRANSFER_DOUBLE:
	loadDouble(getFd(opcode), pAddress);
	break;
	#ifdef CONFIG_FPE_NWFPE_XP
	case TRANSFER_EXTENDED:
	loadExtended(getFd(opcode), pAddress);
	break;
	#endif
	default:
	nRc = 0;
	}

	if (write_back)
	writeRegister(getRn(opcode), (unsigned long) pFinal);
	return nRc;
	}

	unsigned int PerformSTF(const unsigned int opcode)
	{
	unsigned int __user pBase, pAddress, *pFinal;
	unsigned int nRc = 1, write_back = WRITE_BACK(opcode);
	struct roundingData roundData;

	roundData.mode = SetRoundingMode(opcode);
	roundData.precision = SetRoundingPrecision(opcode);
	roundData.exception = 0;

	pBase = (unsigned int __user *) readRegister(getRn(opcode));
	if (REG_PC == getRn(opcode)) {
	pBase += 2;
	write_back = 0;
	}

	pFinal = pBase;
	if (BIT_UP_SET(opcode))
	pFinal += getOffset(opcode);
	else
	pFinal -= getOffset(opcode);

	if (PREINDEXED(opcode))
	pAddress = pFinal;
	else
	pAddress = pBase;

	switch (opcode & MASK_TRANSFER_LENGTH) {
	case TRANSFER_SINGLE:
	storeSingle(&roundData, getFd(opcode), pAddress);
	break;
	case TRANSFER_DOUBLE:
	storeDouble(&roundData, getFd(opcode), pAddress);
	break;
	#ifdef CONFIG_FPE_NWFPE_XP
	case TRANSFER_EXTENDED:
	storeExtended(getFd(opcode), pAddress);
	break;
	#endif
	default:
	nRc = 0;
	}

	if (roundData.exception)
	float_raise(roundData.exception);

	if (write_back)
	writeRegister(getRn(opcode), (unsigned long) pFinal);
	return nRc;
	}

	unsigned int PerformLFM(const unsigned int opcode)
	{
	unsigned int __user pBase, pAddress, *pFinal;
	unsigned int i, Fd, write_back = WRITE_BACK(opcode);

	pBase = (unsigned int __user *) readRegister(getRn(opcode));
	if (REG_PC == getRn(opcode)) {
	pBase += 2;
	write_back = 0;
	}

	pFinal = pBase;
	if (BIT_UP_SET(opcode))
	pFinal += getOffset(opcode);
	else
	pFinal -= getOffset(opcode);

	if (PREINDEXED(opcode))
	pAddress = pFinal;
	else
	pAddress = pBase;

	Fd = getFd(opcode);
	for (i = getRegisterCount(opcode); i > 0; i--) {
	loadMultiple(Fd, pAddress);
	pAddress += 3;
	Fd++;
	if (Fd == 8)
	Fd = 0;
	}

	if (write_back)
	writeRegister(getRn(opcode), (unsigned long) pFinal);
	return 1;
	}

	unsigned int PerformSFM(const unsigned int opcode)
	{
	unsigned int __user pBase, pAddress, *pFinal;
	unsigned int i, Fd, write_back = WRITE_BACK(opcode);

	pBase = (unsigned int __user *) readRegister(getRn(opcode));
	if (REG_PC == getRn(opcode)) {
	pBase += 2;
	write_back = 0;
	}

	pFinal = pBase;
	if (BIT_UP_SET(opcode))
	pFinal += getOffset(opcode);
	else
	pFinal -= getOffset(opcode);

	if (PREINDEXED(opcode))
	pAddress = pFinal;
	else
	pAddress = pBase;

	Fd = getFd(opcode);
	for (i = getRegisterCount(opcode); i > 0; i--) {
	storeMultiple(Fd, pAddress);
	pAddress += 3;
	Fd++;
	if (Fd == 8)
	Fd = 0;
	}

	if (write_back)
	writeRegister(getRn(opcode), (unsigned long) pFinal);
	return 1;
	}

	unsigned int EmulateCPDT(const unsigned int opcode)
	{
	unsigned int nRc = 0;

	if (LDF_OP(opcode)) {
	nRc = PerformLDF(opcode);
	} else if (LFM_OP(opcode)) {
	nRc = PerformLFM(opcode);
	} else if (STF_OP(opcode)) {
	nRc = PerformSTF(opcode);
	} else if (SFM_OP(opcode)) {
	nRc = PerformSFM(opcode);
	} else {
	nRc = 0;
	}

	return nRc;
	}