mirror of
https://github.com/torvalds/linux.git
synced 2024-11-27 06:31:52 +00:00
408 lines
8.9 KiB
C
408 lines
8.9 KiB
C
/*
|
|
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;
|
|
}
|