arch/arm26/nwfpe/fpa11_cpdt.c

   1 /*
   2     NetWinder Floating Point Emulator
   3     (c) Rebel.com, 1998-1999
   4     (c) Philip Blundell, 1998
   5
   6     Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
   7
   8     This program is free software; you can redistribute it and/or modify
   9     it under the terms of the GNU General Public License as published by
  10     the Free Software Foundation; either version 2 of the License, or
  11     (at your option) any later version.
  12
  13     This program is distributed in the hope that it will be useful,
  14     but WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16     GNU General Public License for more details.
  17
  18     You should have received a copy of the GNU General Public License
  19     along with this program; if not, write to the Free Software
  20     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "fpa11.h"
  24 #include "softfloat.h"
  25 #include "fpopcode.h"
  26 #include "fpmodule.h"
  27 #include "fpmodule.inl"
  28
  29 #include <asm/uaccess.h>
  30
  31 static inline
  32 void loadSingle(const unsigned int Fn,const unsigned int *pMem)
  33 {
  34    FPA11 *fpa11 = GET_FPA11();
  35    fpa11->fType[Fn] = typeSingle;
  36    get_user(fpa11->fpreg[Fn].fSingle, pMem);
  37 }
  38
  39 static inline
  40 void loadDouble(const unsigned int Fn,const unsigned int *pMem)
  41 {
  42    FPA11 *fpa11 = GET_FPA11();
  43    unsigned int *p;
  44    p = (unsigned int*)&fpa11->fpreg[Fn].fDouble;
  45    fpa11->fType[Fn] = typeDouble;
  46    get_user(p[0], &pMem[1]);
  47    get_user(p[1], &pMem[0]); /* sign & exponent */
  48 }
  49
  50 static inline
  51 void loadExtended(const unsigned int Fn,const unsigned int *pMem)
  52 {
  53    FPA11 *fpa11 = GET_FPA11();
  54    unsigned int *p;
  55    p = (unsigned int*)&fpa11->fpreg[Fn].fExtended;
  56    fpa11->fType[Fn] = typeExtended;
  57    get_user(p[0], &pMem[0]);  /* sign & exponent */
  58    get_user(p[1], &pMem[2]);  /* ls bits */
  59    get_user(p[2], &pMem[1]);  /* ms bits */
  60 }
  61
  62 static inline
  63 void loadMultiple(const unsigned int Fn,const unsigned int *pMem)
  64 {
  65    FPA11 *fpa11 = GET_FPA11();
  66    register unsigned int *p;
  67    unsigned long x;
  68
  69    p = (unsigned int*)&(fpa11->fpreg[Fn]);
  70    get_user(x, &pMem[0]);
  71    fpa11->fType[Fn] = (x >> 14) & 0x00000003;
  72
  73    switch (fpa11->fType[Fn])
  74    {
  75       case typeSingle:
  76       case typeDouble:
  77       {
  78          get_user(p[0], &pMem[2]);  /* Single */
  79          get_user(p[1], &pMem[1]);  /* double msw */
  80          p[2] = 0;        /* empty */
  81       }
  82       break;
  83
  84       case typeExtended:
  85       {
  86          get_user(p[1], &pMem[2]);
  87          get_user(p[2], &pMem[1]);  /* msw */
  88          p[0] = (x & 0x80003fff);
  89       }
  90       break;
  91    }
  92 }
  93
  94 static inline
  95 void storeSingle(const unsigned int Fn,unsigned int *pMem)
  96 {
  97    FPA11 *fpa11 = GET_FPA11();
  98    union
  99    {
 100      float32 f;
 101      unsigned int i[1];
 102    } val;
 103
 104    switch (fpa11->fType[Fn])
 105    {
 106       case typeDouble:
 107          val.f = float64_to_float32(fpa11->fpreg[Fn].fDouble);
 108       break;
 109
 110       case typeExtended:
 111          val.f = floatx80_to_float32(fpa11->fpreg[Fn].fExtended);
 112       break;
 113
 114       default: val.f = fpa11->fpreg[Fn].fSingle;
 115    }
 116
 117    put_user(val.i[0], pMem);
 118 }
 119
 120 static inline
 121 void storeDouble(const unsigned int Fn,unsigned int *pMem)
 122 {
 123    FPA11 *fpa11 = GET_FPA11();
 124    union
 125    {
 126      float64 f;
 127      unsigned int i[2];
 128    } val;
 129
 130    switch (fpa11->fType[Fn])
 131    {
 132       case typeSingle:
 133          val.f = float32_to_float64(fpa11->fpreg[Fn].fSingle);
 134       break;
 135
 136       case typeExtended:
 137          val.f = floatx80_to_float64(fpa11->fpreg[Fn].fExtended);
 138       break;
 139
 140       default: val.f = fpa11->fpreg[Fn].fDouble;
 141    }
 142
 143    put_user(val.i[1], &pMem[0]);        /* msw */
 144    put_user(val.i[0], &pMem[1]);        /* lsw */
 145 }
 146
 147 static inline
 148 void storeExtended(const unsigned int Fn,unsigned int *pMem)
 149 {
 150    FPA11 *fpa11 = GET_FPA11();
 151    union
 152    {
 153      floatx80 f;
 154      unsigned int i[3];
 155    } val;
 156
 157    switch (fpa11->fType[Fn])
 158    {
 159       case typeSingle:
 160          val.f = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
 161       break;
 162
 163       case typeDouble:
 164          val.f = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
 165       break;
 166
 167       default: val.f = fpa11->fpreg[Fn].fExtended;
 168    }
 169
 170    put_user(val.i[0], &pMem[0]); /* sign & exp */
 171    put_user(val.i[1], &pMem[2]);
 172    put_user(val.i[2], &pMem[1]); /* msw */
 173 }
 174
 175 static inline
 176 void storeMultiple(const unsigned int Fn,unsigned int *pMem)
 177 {
 178    FPA11 *fpa11 = GET_FPA11();
 179    register unsigned int nType, *p;
 180
 181    p = (unsigned int*)&(fpa11->fpreg[Fn]);
 182    nType = fpa11->fType[Fn];
 183
 184    switch (nType)
 185    {
 186       case typeSingle:
 187       case typeDouble:
 188       {
 189          put_user(p[0], &pMem[2]); /* single */
 190          put_user(p[1], &pMem[1]); /* double msw */
 191          put_user(nType << 14, &pMem[0]);
 192       }
 193       break;
 194
 195       case typeExtended:
 196       {
 197          put_user(p[2], &pMem[1]); /* msw */
 198          put_user(p[1], &pMem[2]);
 199          put_user((p[0] & 0x80003fff) | (nType << 14), &pMem[0]);
 200       }
 201       break;
 202    }
 203 }
 204
 205 unsigned int PerformLDF(const unsigned int opcode)
 206 {
 207    unsigned int *pBase, *pAddress, *pFinal, nRc = 1,
 208      write_back = WRITE_BACK(opcode);
 209
 210    //printk("PerformLDF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
 211
 212    pBase = (unsigned int*)readRegister(getRn(opcode));
 213    if (REG_PC == getRn(opcode))
 214    {
 215      pBase += 2;
 216      write_back = 0;
 217    }
 218
 219    pFinal = pBase;
 220    if (BIT_UP_SET(opcode))
 221      pFinal += getOffset(opcode);
 222    else
 223      pFinal -= getOffset(opcode);
 224
 225    if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;
 226
 227    switch (opcode & MASK_TRANSFER_LENGTH)
 228    {
 229       case TRANSFER_SINGLE  : loadSingle(getFd(opcode),pAddress);   break;
 230       case TRANSFER_DOUBLE  : loadDouble(getFd(opcode),pAddress);   break;
 231       case TRANSFER_EXTENDED: loadExtended(getFd(opcode),pAddress); break;
 232       default: nRc = 0;
 233    }
 234
 235    if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
 236    return nRc;
 237 }
 238
 239 unsigned int PerformSTF(const unsigned int opcode)
 240 {
 241    unsigned int *pBase, *pAddress, *pFinal, nRc = 1,
 242      write_back = WRITE_BACK(opcode);
 243
 244    //printk("PerformSTF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode));
 245    SetRoundingMode(ROUND_TO_NEAREST);
 246
 247    pBase = (unsigned int*)readRegister(getRn(opcode));
 248    if (REG_PC == getRn(opcode))
 249    {
 250      pBase += 2;
 251      write_back = 0;
 252    }
 253
 254    pFinal = pBase;
 255    if (BIT_UP_SET(opcode))
 256      pFinal += getOffset(opcode);
 257    else
 258      pFinal -= getOffset(opcode);
 259
 260    if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;
 261
 262    switch (opcode & MASK_TRANSFER_LENGTH)
 263    {
 264       case TRANSFER_SINGLE  : storeSingle(getFd(opcode),pAddress);   break;
 265       case TRANSFER_DOUBLE  : storeDouble(getFd(opcode),pAddress);   break;
 266       case TRANSFER_EXTENDED: storeExtended(getFd(opcode),pAddress); break;
 267       default: nRc = 0;
 268    }
 269
 270    if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
 271    return nRc;
 272 }
 273
 274 unsigned int PerformLFM(const unsigned int opcode)
 275 {
 276    unsigned int i, Fd, *pBase, *pAddress, *pFinal,
 277      write_back = WRITE_BACK(opcode);
 278
 279    pBase = (unsigned int*)readRegister(getRn(opcode));
 280    if (REG_PC == getRn(opcode))
 281    {
 282      pBase += 2;
 283      write_back = 0;
 284    }
 285
 286    pFinal = pBase;
 287    if (BIT_UP_SET(opcode))
 288      pFinal += getOffset(opcode);
 289    else
 290      pFinal -= getOffset(opcode);
 291
 292    if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;
 293
 294    Fd = getFd(opcode);
 295    for (i=getRegisterCount(opcode);i>0;i--)
 296    {
 297      loadMultiple(Fd,pAddress);
 298      pAddress += 3; Fd++;
 299      if (Fd == 8) Fd = 0;
 300    }
 301
 302    if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
 303    return 1;
 304 }
 305
 306 unsigned int PerformSFM(const unsigned int opcode)
 307 {
 308    unsigned int i, Fd, *pBase, *pAddress, *pFinal,
 309      write_back = WRITE_BACK(opcode);
 310
 311    pBase = (unsigned int*)readRegister(getRn(opcode));
 312    if (REG_PC == getRn(opcode))
 313    {
 314      pBase += 2;
 315      write_back = 0;
 316    }
 317
 318    pFinal = pBase;
 319    if (BIT_UP_SET(opcode))
 320      pFinal += getOffset(opcode);
 321    else
 322      pFinal -= getOffset(opcode);
 323
 324    if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase;
 325
 326    Fd = getFd(opcode);
 327    for (i=getRegisterCount(opcode);i>0;i--)
 328    {
 329      storeMultiple(Fd,pAddress);
 330      pAddress += 3; Fd++;
 331      if (Fd == 8) Fd = 0;
 332    }
 333
 334    if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal);
 335    return 1;
 336 }
 337
 338 #if 1
 339 unsigned int EmulateCPDT(const unsigned int opcode)
 340 {
 341   unsigned int nRc = 0;
 342
 343   //printk("EmulateCPDT(0x%08x)\n",opcode);
 344
 345   if (LDF_OP(opcode))
 346   {
 347     nRc = PerformLDF(opcode);
 348   }
 349   else if (LFM_OP(opcode))
 350   {
 351     nRc = PerformLFM(opcode);
 352   }
 353   else if (STF_OP(opcode))
 354   {
 355     nRc = PerformSTF(opcode);
 356   }
 357   else if (SFM_OP(opcode))
 358   {
 359     nRc = PerformSFM(opcode);
 360   }
 361   else
 362   {
 363     nRc = 0;
 364   }
 365
 366   return nRc;
 367 }
 368 #endif