arch/arm/nwfpe/fpa11_cpdt.c

   1 /*
   2     NetWinder Floating Point Emulator
   3     (c) Rebel.com, 1998-1999
   4     (c) Philip Blundell, 1998, 2001
   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 <linux/config.h>
  24 #include "fpa11.h"
  25 #include "softfloat.h"
  26 #include "fpopcode.h"
  27 #include "fpmodule.h"
  28 #include "fpmodule.inl"
  29
  30 #include <asm/uaccess.h>
  31
  32 static inline void loadSingle(const unsigned int Fn, const unsigned int __user *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 void loadDouble(const unsigned int Fn, const unsigned int __user *pMem)
  40 {
  41         FPA11 *fpa11 = GET_FPA11();
  42         unsigned int *p;
  43         p = (unsigned int *) &fpa11->fpreg[Fn].fDouble;
  44         fpa11->fType[Fn] = typeDouble;
  45 #ifdef __ARMEB__
  46         get_user(p[0], &pMem[0]);       /* sign & exponent */
  47         get_user(p[1], &pMem[1]);
  48 #else
  49         get_user(p[0], &pMem[1]);
  50         get_user(p[1], &pMem[0]);       /* sign & exponent */
  51 #endif
  52 }
  53
  54 #ifdef CONFIG_FPE_NWFPE_XP
  55 static inline void loadExtended(const unsigned int Fn, const unsigned int __user *pMem)
  56 {
  57         FPA11 *fpa11 = GET_FPA11();
  58         unsigned int *p;
  59         p = (unsigned int *) &fpa11->fpreg[Fn].fExtended;
  60         fpa11->fType[Fn] = typeExtended;
  61         get_user(p[0], &pMem[0]);       /* sign & exponent */
  62 #ifdef __ARMEB__
  63         get_user(p[1], &pMem[1]);       /* ms bits */
  64         get_user(p[2], &pMem[2]);       /* ls bits */
  65 #else
  66         get_user(p[1], &pMem[2]);       /* ls bits */
  67         get_user(p[2], &pMem[1]);       /* ms bits */
  68 #endif
  69 }
  70 #endif
  71
  72 static inline void loadMultiple(const unsigned int Fn, const unsigned int __user *pMem)
  73 {
  74         FPA11 *fpa11 = GET_FPA11();
  75         register unsigned int *p;
  76         unsigned long x;
  77
  78         p = (unsigned int *) &(fpa11->fpreg[Fn]);
  79         get_user(x, &pMem[0]);
  80         fpa11->fType[Fn] = (x >> 14) & 0x00000003;
  81
  82         switch (fpa11->fType[Fn]) {
  83         case typeSingle:
  84         case typeDouble:
  85                 {
  86                         get_user(p[0], &pMem[2]);       /* Single */
  87                         get_user(p[1], &pMem[1]);       /* double msw */
  88                         p[2] = 0;                       /* empty */
  89                 }
  90                 break;
  91
  92 #ifdef CONFIG_FPE_NWFPE_XP
  93         case typeExtended:
  94                 {
  95                         get_user(p[1], &pMem[2]);
  96                         get_user(p[2], &pMem[1]);       /* msw */
  97                         p[0] = (x & 0x80003fff);
  98                 }
  99                 break;
 100 #endif
 101         }
 102 }
 103
 104 static inline void storeSingle(struct roundingData *roundData, const unsigned int Fn, unsigned int __user *pMem)
 105 {
 106         FPA11 *fpa11 = GET_FPA11();
 107         union {
 108                 float32 f;
 109                 unsigned int i[1];
 110         } val;
 111
 112         switch (fpa11->fType[Fn]) {
 113         case typeDouble:
 114                 val.f = float64_to_float32(roundData, fpa11->fpreg[Fn].fDouble);
 115                 break;
 116
 117 #ifdef CONFIG_FPE_NWFPE_XP
 118         case typeExtended:
 119                 val.f = floatx80_to_float32(roundData, fpa11->fpreg[Fn].fExtended);
 120                 break;
 121 #endif
 122
 123         default:
 124                 val.f = fpa11->fpreg[Fn].fSingle;
 125         }
 126
 127         put_user(val.i[0], pMem);
 128 }
 129
 130 static inline void storeDouble(struct roundingData *roundData, const unsigned int Fn, unsigned int __user *pMem)
 131 {
 132         FPA11 *fpa11 = GET_FPA11();
 133         union {
 134                 float64 f;
 135                 unsigned int i[2];
 136         } val;
 137
 138         switch (fpa11->fType[Fn]) {
 139         case typeSingle:
 140                 val.f = float32_to_float64(fpa11->fpreg[Fn].fSingle);
 141                 break;
 142
 143 #ifdef CONFIG_FPE_NWFPE_XP
 144         case typeExtended:
 145                 val.f = floatx80_to_float64(roundData, fpa11->fpreg[Fn].fExtended);
 146                 break;
 147 #endif
 148
 149         default:
 150                 val.f = fpa11->fpreg[Fn].fDouble;
 151         }
 152
 153 #ifdef __ARMEB__
 154         put_user(val.i[0], &pMem[0]);   /* msw */
 155         put_user(val.i[1], &pMem[1]);   /* lsw */
 156 #else
 157         put_user(val.i[1], &pMem[0]);   /* msw */
 158         put_user(val.i[0], &pMem[1]);   /* lsw */
 159 #endif
 160 }
 161
 162 #ifdef CONFIG_FPE_NWFPE_XP
 163 static inline void storeExtended(const unsigned int Fn, unsigned int __user *pMem)
 164 {
 165         FPA11 *fpa11 = GET_FPA11();
 166         union {
 167                 floatx80 f;
 168                 unsigned int i[3];
 169         } val;
 170
 171         switch (fpa11->fType[Fn]) {
 172         case typeSingle:
 173                 val.f = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
 174                 break;
 175
 176         case typeDouble:
 177                 val.f = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
 178                 break;
 179
 180         default:
 181                 val.f = fpa11->fpreg[Fn].fExtended;
 182         }
 183
 184         put_user(val.i[0], &pMem[0]);   /* sign & exp */
 185 #ifdef __ARMEB__
 186         put_user(val.i[1], &pMem[1]);   /* msw */
 187         put_user(val.i[2], &pMem[2]);
 188 #else
 189         put_user(val.i[1], &pMem[2]);
 190         put_user(val.i[2], &pMem[1]);   /* msw */
 191 #endif
 192 }
 193 #endif
 194
 195 static inline void storeMultiple(const unsigned int Fn, unsigned int __user *pMem)
 196 {
 197         FPA11 *fpa11 = GET_FPA11();
 198         register unsigned int nType, *p;
 199
 200         p = (unsigned int *) &(fpa11->fpreg[Fn]);
 201         nType = fpa11->fType[Fn];
 202
 203         switch (nType) {
 204         case typeSingle:
 205         case typeDouble:
 206                 {
 207                         put_user(p[0], &pMem[2]);       /* single */
 208                         put_user(p[1], &pMem[1]);       /* double msw */
 209                         put_user(nType << 14, &pMem[0]);
 210                 }
 211                 break;
 212
 213 #ifdef CONFIG_FPE_NWFPE_XP
 214         case typeExtended:
 215                 {
 216                         put_user(p[2], &pMem[1]);       /* msw */
 217                         put_user(p[1], &pMem[2]);
 218                         put_user((p[0] & 0x80003fff) | (nType << 14), &pMem[0]);
 219                 }
 220                 break;
 221 #endif
 222         }
 223 }
 224
 225 unsigned int PerformLDF(const unsigned int opcode)
 226 {
 227         unsigned int __user *pBase, *pAddress, *pFinal;
 228         unsigned int nRc = 1, write_back = WRITE_BACK(opcode);
 229
 230         pBase = (unsigned int __user *) readRegister(getRn(opcode));
 231         if (REG_PC == getRn(opcode)) {
 232                 pBase += 2;
 233                 write_back = 0;
 234         }
 235
 236         pFinal = pBase;
 237         if (BIT_UP_SET(opcode))
 238                 pFinal += getOffset(opcode);
 239         else
 240                 pFinal -= getOffset(opcode);
 241
 242         if (PREINDEXED(opcode))
 243                 pAddress = pFinal;
 244         else
 245                 pAddress = pBase;
 246
 247         switch (opcode & MASK_TRANSFER_LENGTH) {
 248         case TRANSFER_SINGLE:
 249                 loadSingle(getFd(opcode), pAddress);
 250                 break;
 251         case TRANSFER_DOUBLE:
 252                 loadDouble(getFd(opcode), pAddress);
 253                 break;
 254 #ifdef CONFIG_FPE_NWFPE_XP
 255         case TRANSFER_EXTENDED:
 256                 loadExtended(getFd(opcode), pAddress);
 257                 break;
 258 #endif
 259         default:
 260                 nRc = 0;
 261         }
 262
 263         if (write_back)
 264                 writeRegister(getRn(opcode), (unsigned long) pFinal);
 265         return nRc;
 266 }
 267
 268 unsigned int PerformSTF(const unsigned int opcode)
 269 {
 270         unsigned int __user *pBase, *pAddress, *pFinal;
 271         unsigned int nRc = 1, write_back = WRITE_BACK(opcode);
 272         struct roundingData roundData;
 273
 274         roundData.mode = SetRoundingMode(opcode);
 275         roundData.precision = SetRoundingPrecision(opcode);
 276         roundData.exception = 0;
 277
 278         pBase = (unsigned int __user *) readRegister(getRn(opcode));
 279         if (REG_PC == getRn(opcode)) {
 280                 pBase += 2;
 281                 write_back = 0;
 282         }
 283
 284         pFinal = pBase;
 285         if (BIT_UP_SET(opcode))
 286                 pFinal += getOffset(opcode);
 287         else
 288                 pFinal -= getOffset(opcode);
 289
 290         if (PREINDEXED(opcode))
 291                 pAddress = pFinal;
 292         else
 293                 pAddress = pBase;
 294
 295         switch (opcode & MASK_TRANSFER_LENGTH) {
 296         case TRANSFER_SINGLE:
 297                 storeSingle(&roundData, getFd(opcode), pAddress);
 298                 break;
 299         case TRANSFER_DOUBLE:
 300                 storeDouble(&roundData, getFd(opcode), pAddress);
 301                 break;
 302 #ifdef CONFIG_FPE_NWFPE_XP
 303         case TRANSFER_EXTENDED:
 304                 storeExtended(getFd(opcode), pAddress);
 305                 break;
 306 #endif
 307         default:
 308                 nRc = 0;
 309         }
 310
 311         if (roundData.exception)
 312                 float_raise(roundData.exception);
 313
 314         if (write_back)
 315                 writeRegister(getRn(opcode), (unsigned long) pFinal);
 316         return nRc;
 317 }
 318
 319 unsigned int PerformLFM(const unsigned int opcode)
 320 {
 321         unsigned int __user *pBase, *pAddress, *pFinal;
 322         unsigned int i, Fd, write_back = WRITE_BACK(opcode);
 323
 324         pBase = (unsigned int __user *) readRegister(getRn(opcode));
 325         if (REG_PC == getRn(opcode)) {
 326                 pBase += 2;
 327                 write_back = 0;
 328         }
 329
 330         pFinal = pBase;
 331         if (BIT_UP_SET(opcode))
 332                 pFinal += getOffset(opcode);
 333         else
 334                 pFinal -= getOffset(opcode);
 335
 336         if (PREINDEXED(opcode))
 337                 pAddress = pFinal;
 338         else
 339                 pAddress = pBase;
 340
 341         Fd = getFd(opcode);
 342         for (i = getRegisterCount(opcode); i > 0; i--) {
 343                 loadMultiple(Fd, pAddress);
 344                 pAddress += 3;
 345                 Fd++;
 346                 if (Fd == 8)
 347                         Fd = 0;
 348         }
 349
 350         if (write_back)
 351                 writeRegister(getRn(opcode), (unsigned long) pFinal);
 352         return 1;
 353 }
 354
 355 unsigned int PerformSFM(const unsigned int opcode)
 356 {
 357         unsigned int __user *pBase, *pAddress, *pFinal;
 358         unsigned int i, Fd, write_back = WRITE_BACK(opcode);
 359
 360         pBase = (unsigned int __user *) readRegister(getRn(opcode));
 361         if (REG_PC == getRn(opcode)) {
 362                 pBase += 2;
 363                 write_back = 0;
 364         }
 365
 366         pFinal = pBase;
 367         if (BIT_UP_SET(opcode))
 368                 pFinal += getOffset(opcode);
 369         else
 370                 pFinal -= getOffset(opcode);
 371
 372         if (PREINDEXED(opcode))
 373                 pAddress = pFinal;
 374         else
 375                 pAddress = pBase;
 376
 377         Fd = getFd(opcode);
 378         for (i = getRegisterCount(opcode); i > 0; i--) {
 379                 storeMultiple(Fd, pAddress);
 380                 pAddress += 3;
 381                 Fd++;
 382                 if (Fd == 8)
 383                         Fd = 0;
 384         }
 385
 386         if (write_back)
 387                 writeRegister(getRn(opcode), (unsigned long) pFinal);
 388         return 1;
 389 }
 390
 391 unsigned int EmulateCPDT(const unsigned int opcode)
 392 {
 393         unsigned int nRc = 0;
 394
 395         if (LDF_OP(opcode)) {
 396                 nRc = PerformLDF(opcode);
 397         } else if (LFM_OP(opcode)) {
 398                 nRc = PerformLFM(opcode);
 399         } else if (STF_OP(opcode)) {
 400                 nRc = PerformSTF(opcode);
 401         } else if (SFM_OP(opcode)) {
 402                 nRc = PerformSFM(opcode);
 403         } else {
 404                 nRc = 0;
 405         }
 406
 407         return nRc;
 408 }