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