Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |