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linux/arch/arm/nwfpe/fpa11_cpdt.c
Thomas Gleixner 74ba9207e1 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 441 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-24 17:36:45 +02:00

396 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
NetWinder Floating Point Emulator
(c) Rebel.com, 1998-1999
(c) Philip Blundell, 1998, 2001
Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
*/
#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;
}
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