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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 | // SPDX-License-Identifier: GPL-2.0-or-later /* NetWinder Floating Point Emulator (c) Rebel.com, 1998-1999 (c) Philip Blundell, 1998, 2001 Direct questions, comments to Scott Bambrough <scottb@netwinder.org> */ #include "fpa11.h" #include "softfloat.h" #include "fpopcode.h" #include "fpmodule.h" #include "fpmodule.inl" #include <linux/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; } |