1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
369 lines
8.4 KiB
C
369 lines
8.4 KiB
C
/*
|
|
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
|