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linux-sg2042/arch/arm26/nwfpe/fpa11_cpdt.c

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/*
NetWinder Floating Point Emulator
(c) Rebel.com, 1998-1999
(c) Philip Blundell, 1998
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 <asm/uaccess.h>
static inline
void loadSingle(const unsigned int Fn,const unsigned int *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 *pMem)
{
FPA11 *fpa11 = GET_FPA11();
unsigned int *p;
p = (unsigned int*)&fpa11->fpreg[Fn].fDouble;
fpa11->fType[Fn] = typeDouble;
get_user(p[0], &pMem[1]);
get_user(p[1], &pMem[0]); /* sign & exponent */
}
static inline
void loadExtended(const unsigned int Fn,const unsigned int *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 */
get_user(p[1], &pMem[2]); /* ls bits */
get_user(p[2], &pMem[1]); /* ms bits */
}
static inline
void loadMultiple(const unsigned int Fn,const unsigned int *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;
case typeExtended:
{
get_user(p[1], &pMem[2]);
get_user(p[2], &pMem[1]); /* msw */
p[0] = (x & 0x80003fff);
}
break;
}
}
static inline
void storeSingle(const unsigned int Fn,unsigned int *pMem)
{
FPA11 *fpa11 = GET_FPA11();
union
{
float32 f;
unsigned int i[1];
} val;
switch (fpa11->fType[Fn])
{
case typeDouble:
val.f = float64_to_float32(fpa11->fpreg[Fn].fDouble);
break;
case typeExtended:
val.f = floatx80_to_float32(fpa11->fpreg[Fn].fExtended);
break;
default: val.f = fpa11->fpreg[Fn].fSingle;
}
put_user(val.i[0], pMem);
}
static inline
void storeDouble(const unsigned int Fn,unsigned int *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;
case typeExtended:
val.f = floatx80_to_float64(fpa11->fpreg[Fn].fExtended);
break;
default: val.f = fpa11->fpreg[Fn].fDouble;
}
put_user(val.i[1], &pMem[0]); /* msw */
put_user(val.i[0], &pMem[1]); /* lsw */
}
static inline
void storeExtended(const unsigned int Fn,unsigned int *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 */
put_user(val.i[1], &pMem[2]);
put_user(val.i[2], &pMem[1]); /* msw */
}
static inline
void storeMultiple(const unsigned int Fn,unsigned int *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;
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;
}
}
unsigned int PerformLDF(const unsigned int opcode)
{
unsigned int *pBase, *pAddress, *pFinal, nRc = 1,
write_back = WRITE_BACK(opcode);
//printk("PerformLDF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
pBase = (unsigned int*)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;
case TRANSFER_EXTENDED: loadExtended(getFd(opcode),pAddress); break;
default: nRc = 0;
}
if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
return nRc;
}
unsigned int PerformSTF(const unsigned int opcode)
{
unsigned int *pBase, *pAddress, *pFinal, nRc = 1,
write_back = WRITE_BACK(opcode);
//printk("PerformSTF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
SetRoundingMode(ROUND_TO_NEAREST);
pBase = (unsigned int*)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(getFd(opcode),pAddress); break;
case TRANSFER_DOUBLE : storeDouble(getFd(opcode),pAddress); break;
case TRANSFER_EXTENDED: storeExtended(getFd(opcode),pAddress); break;
default: nRc = 0;
}
if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
return nRc;
}
unsigned int PerformLFM(const unsigned int opcode)
{
unsigned int i, Fd, *pBase, *pAddress, *pFinal,
write_back = WRITE_BACK(opcode);
pBase = (unsigned int*)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 int)pFinal);
return 1;
}
unsigned int PerformSFM(const unsigned int opcode)
{
unsigned int i, Fd, *pBase, *pAddress, *pFinal,
write_back = WRITE_BACK(opcode);
pBase = (unsigned int*)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 int)pFinal);
return 1;
}
#if 1
unsigned int EmulateCPDT(const unsigned int opcode)
{
unsigned int nRc = 0;
//printk("EmulateCPDT(0x%08x)\n",opcode);
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;
}
#endif
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