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fpa11_cpdt.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 <asm/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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