| 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, see <http://www.gnu.org/licenses/>. |
| 20 | */ |
| 21 | |
| 22 | #include "qemu/osdep.h" |
| 23 | #include "fpa11.h" |
| 24 | #include "fpu/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, target_ulong addr) |
| 33 | { |
| 34 | FPA11 *fpa11 = GET_FPA11(); |
| 35 | fpa11->fType[Fn] = typeSingle; |
| 36 | /* FIXME - handle failure of get_user() */ |
| 37 | get_user_u32(float32_val(fpa11->fpreg[Fn].fSingle), addr); |
| 38 | } |
| 39 | |
| 40 | static inline |
| 41 | void loadDouble(const unsigned int Fn, target_ulong addr) |
| 42 | { |
| 43 | FPA11 *fpa11 = GET_FPA11(); |
| 44 | unsigned int *p; |
| 45 | p = (unsigned int*)&fpa11->fpreg[Fn].fDouble; |
| 46 | fpa11->fType[Fn] = typeDouble; |
| 47 | #if HOST_BIG_ENDIAN |
| 48 | /* FIXME - handle failure of get_user() */ |
| 49 | get_user_u32(p[0], addr); /* sign & exponent */ |
| 50 | get_user_u32(p[1], addr + 4); |
| 51 | #else |
| 52 | /* FIXME - handle failure of get_user() */ |
| 53 | get_user_u32(p[0], addr + 4); |
| 54 | get_user_u32(p[1], addr); /* sign & exponent */ |
| 55 | #endif |
| 56 | } |
| 57 | |
| 58 | static inline |
| 59 | void loadExtended(const unsigned int Fn, target_ulong addr) |
| 60 | { |
| 61 | FPA11 *fpa11 = GET_FPA11(); |
| 62 | unsigned int *p; |
| 63 | p = (unsigned int*)&fpa11->fpreg[Fn].fExtended; |
| 64 | fpa11->fType[Fn] = typeExtended; |
| 65 | /* FIXME - handle failure of get_user() */ |
| 66 | get_user_u32(p[0], addr); /* sign & exponent */ |
| 67 | get_user_u32(p[1], addr + 8); /* ls bits */ |
| 68 | get_user_u32(p[2], addr + 4); /* ms bits */ |
| 69 | } |
| 70 | |
| 71 | static inline |
| 72 | void loadMultiple(const unsigned int Fn, target_ulong addr) |
| 73 | { |
| 74 | FPA11 *fpa11 = GET_FPA11(); |
| 75 | register unsigned int *p; |
| 76 | unsigned long x; |
| 77 | |
| 78 | p = (unsigned int*)&(fpa11->fpreg[Fn]); |
| 79 | /* FIXME - handle failure of get_user() */ |
| 80 | get_user_u32(x, addr); |
| 81 | fpa11->fType[Fn] = (x >> 14) & 0x00000003; |
| 82 | |
| 83 | switch (fpa11->fType[Fn]) |
| 84 | { |
| 85 | case typeSingle: |
| 86 | case typeDouble: |
| 87 | { |
| 88 | /* FIXME - handle failure of get_user() */ |
| 89 | get_user_u32(p[0], addr + 8); /* Single */ |
| 90 | get_user_u32(p[1], addr + 4); /* double msw */ |
| 91 | p[2] = 0; /* empty */ |
| 92 | } |
| 93 | break; |
| 94 | |
| 95 | case typeExtended: |
| 96 | { |
| 97 | /* FIXME - handle failure of get_user() */ |
| 98 | get_user_u32(p[1], addr + 8); |
| 99 | get_user_u32(p[2], addr + 4); /* msw */ |
| 100 | p[0] = (x & 0x80003fff); |
| 101 | } |
| 102 | break; |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | static inline |
| 107 | void storeSingle(const unsigned int Fn, target_ulong addr) |
| 108 | { |
| 109 | FPA11 *fpa11 = GET_FPA11(); |
| 110 | float32 val; |
| 111 | register unsigned int *p = (unsigned int*)&val; |
| 112 | |
| 113 | switch (fpa11->fType[Fn]) |
| 114 | { |
| 115 | case typeDouble: |
| 116 | val = float64_to_float32(fpa11->fpreg[Fn].fDouble, &fpa11->fp_status); |
| 117 | break; |
| 118 | |
| 119 | case typeExtended: |
| 120 | val = floatx80_to_float32(fpa11->fpreg[Fn].fExtended, &fpa11->fp_status); |
| 121 | break; |
| 122 | |
| 123 | default: val = fpa11->fpreg[Fn].fSingle; |
| 124 | } |
| 125 | |
| 126 | /* FIXME - handle put_user() failures */ |
| 127 | put_user_u32(p[0], addr); |
| 128 | } |
| 129 | |
| 130 | static inline |
| 131 | void storeDouble(const unsigned int Fn, target_ulong addr) |
| 132 | { |
| 133 | FPA11 *fpa11 = GET_FPA11(); |
| 134 | float64 val; |
| 135 | register unsigned int *p = (unsigned int*)&val; |
| 136 | |
| 137 | switch (fpa11->fType[Fn]) |
| 138 | { |
| 139 | case typeSingle: |
| 140 | val = float32_to_float64(fpa11->fpreg[Fn].fSingle, &fpa11->fp_status); |
| 141 | break; |
| 142 | |
| 143 | case typeExtended: |
| 144 | val = floatx80_to_float64(fpa11->fpreg[Fn].fExtended, &fpa11->fp_status); |
| 145 | break; |
| 146 | |
| 147 | default: val = fpa11->fpreg[Fn].fDouble; |
| 148 | } |
| 149 | /* FIXME - handle put_user() failures */ |
| 150 | #if HOST_BIG_ENDIAN |
| 151 | put_user_u32(p[0], addr); /* msw */ |
| 152 | put_user_u32(p[1], addr + 4); /* lsw */ |
| 153 | #else |
| 154 | put_user_u32(p[1], addr); /* msw */ |
| 155 | put_user_u32(p[0], addr + 4); /* lsw */ |
| 156 | #endif |
| 157 | } |
| 158 | |
| 159 | static inline |
| 160 | void storeExtended(const unsigned int Fn, target_ulong addr) |
| 161 | { |
| 162 | FPA11 *fpa11 = GET_FPA11(); |
| 163 | floatx80 val; |
| 164 | register unsigned int *p = (unsigned int*)&val; |
| 165 | |
| 166 | switch (fpa11->fType[Fn]) |
| 167 | { |
| 168 | case typeSingle: |
| 169 | val = float32_to_floatx80(fpa11->fpreg[Fn].fSingle, &fpa11->fp_status); |
| 170 | break; |
| 171 | |
| 172 | case typeDouble: |
| 173 | val = float64_to_floatx80(fpa11->fpreg[Fn].fDouble, &fpa11->fp_status); |
| 174 | break; |
| 175 | |
| 176 | default: val = fpa11->fpreg[Fn].fExtended; |
| 177 | } |
| 178 | |
| 179 | /* FIXME - handle put_user() failures */ |
| 180 | put_user_u32(p[0], addr); /* sign & exp */ |
| 181 | put_user_u32(p[1], addr + 8); |
| 182 | put_user_u32(p[2], addr + 4); /* msw */ |
| 183 | } |
| 184 | |
| 185 | static inline |
| 186 | void storeMultiple(const unsigned int Fn, target_ulong addr) |
| 187 | { |
| 188 | FPA11 *fpa11 = GET_FPA11(); |
| 189 | register unsigned int nType, *p; |
| 190 | |
| 191 | p = (unsigned int*)&(fpa11->fpreg[Fn]); |
| 192 | nType = fpa11->fType[Fn]; |
| 193 | |
| 194 | switch (nType) |
| 195 | { |
| 196 | case typeSingle: |
| 197 | case typeDouble: |
| 198 | { |
| 199 | put_user_u32(p[0], addr + 8); /* single */ |
| 200 | put_user_u32(p[1], addr + 4); /* double msw */ |
| 201 | put_user_u32(nType << 14, addr); |
| 202 | } |
| 203 | break; |
| 204 | |
| 205 | case typeExtended: |
| 206 | { |
| 207 | put_user_u32(p[2], addr + 4); /* msw */ |
| 208 | put_user_u32(p[1], addr + 8); |
| 209 | put_user_u32((p[0] & 0x80003fff) | (nType << 14), addr); |
| 210 | } |
| 211 | break; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | static unsigned int PerformLDF(const unsigned int opcode) |
| 216 | { |
| 217 | target_ulong pBase, pAddress, pFinal; |
| 218 | unsigned int nRc = 1, |
| 219 | write_back = WRITE_BACK(opcode); |
| 220 | |
| 221 | //printk("PerformLDF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode)); |
| 222 | |
| 223 | pBase = readRegister(getRn(opcode)); |
| 224 | if (ARM_REG_PC == getRn(opcode)) |
| 225 | { |
| 226 | pBase += 8; |
| 227 | write_back = 0; |
| 228 | } |
| 229 | |
| 230 | pFinal = pBase; |
| 231 | if (BIT_UP_SET(opcode)) |
| 232 | pFinal += getOffset(opcode) * 4; |
| 233 | else |
| 234 | pFinal -= getOffset(opcode) * 4; |
| 235 | |
| 236 | if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; |
| 237 | |
| 238 | switch (opcode & MASK_TRANSFER_LENGTH) |
| 239 | { |
| 240 | case TRANSFER_SINGLE : loadSingle(getFd(opcode),pAddress); break; |
| 241 | case TRANSFER_DOUBLE : loadDouble(getFd(opcode),pAddress); break; |
| 242 | case TRANSFER_EXTENDED: loadExtended(getFd(opcode),pAddress); break; |
| 243 | default: nRc = 0; |
| 244 | } |
| 245 | |
| 246 | if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal); |
| 247 | return nRc; |
| 248 | } |
| 249 | |
| 250 | static unsigned int PerformSTF(const unsigned int opcode) |
| 251 | { |
| 252 | target_ulong pBase, pAddress, pFinal; |
| 253 | unsigned int nRc = 1, |
| 254 | write_back = WRITE_BACK(opcode); |
| 255 | |
| 256 | //printk("PerformSTF(0x%08x), Fd = 0x%08x\n",opcode,getFd(opcode)); |
| 257 | SetRoundingMode(ROUND_TO_NEAREST); |
| 258 | |
| 259 | pBase = readRegister(getRn(opcode)); |
| 260 | if (ARM_REG_PC == getRn(opcode)) |
| 261 | { |
| 262 | pBase += 8; |
| 263 | write_back = 0; |
| 264 | } |
| 265 | |
| 266 | pFinal = pBase; |
| 267 | if (BIT_UP_SET(opcode)) |
| 268 | pFinal += getOffset(opcode) * 4; |
| 269 | else |
| 270 | pFinal -= getOffset(opcode) * 4; |
| 271 | |
| 272 | if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; |
| 273 | |
| 274 | switch (opcode & MASK_TRANSFER_LENGTH) |
| 275 | { |
| 276 | case TRANSFER_SINGLE : storeSingle(getFd(opcode),pAddress); break; |
| 277 | case TRANSFER_DOUBLE : storeDouble(getFd(opcode),pAddress); break; |
| 278 | case TRANSFER_EXTENDED: storeExtended(getFd(opcode),pAddress); break; |
| 279 | default: nRc = 0; |
| 280 | } |
| 281 | |
| 282 | if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal); |
| 283 | return nRc; |
| 284 | } |
| 285 | |
| 286 | static unsigned int PerformLFM(const unsigned int opcode) |
| 287 | { |
| 288 | unsigned int i, Fd, |
| 289 | write_back = WRITE_BACK(opcode); |
| 290 | target_ulong pBase, pAddress, pFinal; |
| 291 | |
| 292 | pBase = readRegister(getRn(opcode)); |
| 293 | if (ARM_REG_PC == getRn(opcode)) |
| 294 | { |
| 295 | pBase += 8; |
| 296 | write_back = 0; |
| 297 | } |
| 298 | |
| 299 | pFinal = pBase; |
| 300 | if (BIT_UP_SET(opcode)) |
| 301 | pFinal += getOffset(opcode) * 4; |
| 302 | else |
| 303 | pFinal -= getOffset(opcode) * 4; |
| 304 | |
| 305 | if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; |
| 306 | |
| 307 | Fd = getFd(opcode); |
| 308 | for (i=getRegisterCount(opcode);i>0;i--) |
| 309 | { |
| 310 | loadMultiple(Fd,pAddress); |
| 311 | pAddress += 12; Fd++; |
| 312 | if (Fd == 8) Fd = 0; |
| 313 | } |
| 314 | |
| 315 | if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal); |
| 316 | return 1; |
| 317 | } |
| 318 | |
| 319 | static unsigned int PerformSFM(const unsigned int opcode) |
| 320 | { |
| 321 | unsigned int i, Fd, |
| 322 | write_back = WRITE_BACK(opcode); |
| 323 | target_ulong pBase, pAddress, pFinal; |
| 324 | |
| 325 | pBase = readRegister(getRn(opcode)); |
| 326 | if (ARM_REG_PC == getRn(opcode)) |
| 327 | { |
| 328 | pBase += 8; |
| 329 | write_back = 0; |
| 330 | } |
| 331 | |
| 332 | pFinal = pBase; |
| 333 | if (BIT_UP_SET(opcode)) |
| 334 | pFinal += getOffset(opcode) * 4; |
| 335 | else |
| 336 | pFinal -= getOffset(opcode) * 4; |
| 337 | |
| 338 | if (PREINDEXED(opcode)) pAddress = pFinal; else pAddress = pBase; |
| 339 | |
| 340 | Fd = getFd(opcode); |
| 341 | for (i=getRegisterCount(opcode);i>0;i--) |
| 342 | { |
| 343 | storeMultiple(Fd,pAddress); |
| 344 | pAddress += 12; Fd++; |
| 345 | if (Fd == 8) Fd = 0; |
| 346 | } |
| 347 | |
| 348 | if (write_back) writeRegister(getRn(opcode),(unsigned int)pFinal); |
| 349 | return 1; |
| 350 | } |
| 351 | |
| 352 | #if 1 |
| 353 | unsigned int EmulateCPDT(const unsigned int opcode) |
| 354 | { |
| 355 | unsigned int nRc = 0; |
| 356 | |
| 357 | //printk("EmulateCPDT(0x%08x)\n",opcode); |
| 358 | |
| 359 | if (LDF_OP(opcode)) |
| 360 | { |
| 361 | nRc = PerformLDF(opcode); |
| 362 | } |
| 363 | else if (LFM_OP(opcode)) |
| 364 | { |
| 365 | nRc = PerformLFM(opcode); |
| 366 | } |
| 367 | else if (STF_OP(opcode)) |
| 368 | { |
| 369 | nRc = PerformSTF(opcode); |
| 370 | } |
| 371 | else if (SFM_OP(opcode)) |
| 372 | { |
| 373 | nRc = PerformSFM(opcode); |
| 374 | } |
| 375 | else |
| 376 | { |
| 377 | nRc = 0; |
| 378 | } |
| 379 | |
| 380 | return nRc; |
| 381 | } |
| 382 | #endif |