1 // Copyright 2014 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_ARM64_DECODER_ARM64_INL_H_ 6 #define V8_ARM64_DECODER_ARM64_INL_H_ 7 8 #include "src/arm64/decoder-arm64.h" 9 #include "src/globals.h" 10 #include "src/utils.h" 11 12 13 namespace v8 { 14 namespace internal { 15 16 17 // Top-level instruction decode function. 18 template<typename V> 19 void Decoder<V>::Decode(Instruction *instr) { 20 if (instr->Bits(28, 27) == 0) { 21 V::VisitUnallocated(instr); 22 } else { 23 switch (instr->Bits(27, 24)) { 24 // 0: PC relative addressing. 25 case 0x0: DecodePCRelAddressing(instr); break; 26 27 // 1: Add/sub immediate. 28 case 0x1: DecodeAddSubImmediate(instr); break; 29 30 // A: Logical shifted register. 31 // Add/sub with carry. 32 // Conditional compare register. 33 // Conditional compare immediate. 34 // Conditional select. 35 // Data processing 1 source. 36 // Data processing 2 source. 37 // B: Add/sub shifted register. 38 // Add/sub extended register. 39 // Data processing 3 source. 40 case 0xA: 41 case 0xB: DecodeDataProcessing(instr); break; 42 43 // 2: Logical immediate. 44 // Move wide immediate. 45 case 0x2: DecodeLogical(instr); break; 46 47 // 3: Bitfield. 48 // Extract. 49 case 0x3: DecodeBitfieldExtract(instr); break; 50 51 // 4: Unconditional branch immediate. 52 // Exception generation. 53 // Compare and branch immediate. 54 // 5: Compare and branch immediate. 55 // Conditional branch. 56 // System. 57 // 6,7: Unconditional branch. 58 // Test and branch immediate. 59 case 0x4: 60 case 0x5: 61 case 0x6: 62 case 0x7: DecodeBranchSystemException(instr); break; 63 64 // 8,9: Load/store register pair post-index. 65 // Load register literal. 66 // Load/store register unscaled immediate. 67 // Load/store register immediate post-index. 68 // Load/store register immediate pre-index. 69 // Load/store register offset. 70 // C,D: Load/store register pair offset. 71 // Load/store register pair pre-index. 72 // Load/store register unsigned immediate. 73 // Advanced SIMD. 74 case 0x8: 75 case 0x9: 76 case 0xC: 77 case 0xD: DecodeLoadStore(instr); break; 78 79 // E: FP fixed point conversion. 80 // FP integer conversion. 81 // FP data processing 1 source. 82 // FP compare. 83 // FP immediate. 84 // FP data processing 2 source. 85 // FP conditional compare. 86 // FP conditional select. 87 // Advanced SIMD. 88 // F: FP data processing 3 source. 89 // Advanced SIMD. 90 case 0xE: 91 case 0xF: DecodeFP(instr); break; 92 } 93 } 94 } 95 96 97 template<typename V> 98 void Decoder<V>::DecodePCRelAddressing(Instruction* instr) { 99 DCHECK(instr->Bits(27, 24) == 0x0); 100 // We know bit 28 is set, as <b28:b27> = 0 is filtered out at the top level 101 // decode. 102 DCHECK(instr->Bit(28) == 0x1); 103 V::VisitPCRelAddressing(instr); 104 } 105 106 107 template<typename V> 108 void Decoder<V>::DecodeBranchSystemException(Instruction* instr) { 109 DCHECK((instr->Bits(27, 24) == 0x4) || 110 (instr->Bits(27, 24) == 0x5) || 111 (instr->Bits(27, 24) == 0x6) || 112 (instr->Bits(27, 24) == 0x7) ); 113 114 switch (instr->Bits(31, 29)) { 115 case 0: 116 case 4: { 117 V::VisitUnconditionalBranch(instr); 118 break; 119 } 120 case 1: 121 case 5: { 122 if (instr->Bit(25) == 0) { 123 V::VisitCompareBranch(instr); 124 } else { 125 V::VisitTestBranch(instr); 126 } 127 break; 128 } 129 case 2: { 130 if (instr->Bit(25) == 0) { 131 if ((instr->Bit(24) == 0x1) || 132 (instr->Mask(0x01000010) == 0x00000010)) { 133 V::VisitUnallocated(instr); 134 } else { 135 V::VisitConditionalBranch(instr); 136 } 137 } else { 138 V::VisitUnallocated(instr); 139 } 140 break; 141 } 142 case 6: { 143 if (instr->Bit(25) == 0) { 144 if (instr->Bit(24) == 0) { 145 if ((instr->Bits(4, 2) != 0) || 146 (instr->Mask(0x00E0001D) == 0x00200001) || 147 (instr->Mask(0x00E0001D) == 0x00400001) || 148 (instr->Mask(0x00E0001E) == 0x00200002) || 149 (instr->Mask(0x00E0001E) == 0x00400002) || 150 (instr->Mask(0x00E0001C) == 0x00600000) || 151 (instr->Mask(0x00E0001C) == 0x00800000) || 152 (instr->Mask(0x00E0001F) == 0x00A00000) || 153 (instr->Mask(0x00C0001C) == 0x00C00000)) { 154 V::VisitUnallocated(instr); 155 } else { 156 V::VisitException(instr); 157 } 158 } else { 159 if (instr->Bits(23, 22) == 0) { 160 const Instr masked_003FF0E0 = instr->Mask(0x003FF0E0); 161 if ((instr->Bits(21, 19) == 0x4) || 162 (masked_003FF0E0 == 0x00033000) || 163 (masked_003FF0E0 == 0x003FF020) || 164 (masked_003FF0E0 == 0x003FF060) || 165 (masked_003FF0E0 == 0x003FF0E0) || 166 (instr->Mask(0x00388000) == 0x00008000) || 167 (instr->Mask(0x0038E000) == 0x00000000) || 168 (instr->Mask(0x0039E000) == 0x00002000) || 169 (instr->Mask(0x003AE000) == 0x00002000) || 170 (instr->Mask(0x003CE000) == 0x00042000) || 171 (instr->Mask(0x003FFFC0) == 0x000320C0) || 172 (instr->Mask(0x003FF100) == 0x00032100) || 173 (instr->Mask(0x003FF200) == 0x00032200) || 174 (instr->Mask(0x003FF400) == 0x00032400) || 175 (instr->Mask(0x003FF800) == 0x00032800) || 176 (instr->Mask(0x0038F000) == 0x00005000) || 177 (instr->Mask(0x0038E000) == 0x00006000)) { 178 V::VisitUnallocated(instr); 179 } else { 180 V::VisitSystem(instr); 181 } 182 } else { 183 V::VisitUnallocated(instr); 184 } 185 } 186 } else { 187 if ((instr->Bit(24) == 0x1) || 188 (instr->Bits(20, 16) != 0x1F) || 189 (instr->Bits(15, 10) != 0) || 190 (instr->Bits(4, 0) != 0) || 191 (instr->Bits(24, 21) == 0x3) || 192 (instr->Bits(24, 22) == 0x3)) { 193 V::VisitUnallocated(instr); 194 } else { 195 V::VisitUnconditionalBranchToRegister(instr); 196 } 197 } 198 break; 199 } 200 case 3: 201 case 7: { 202 V::VisitUnallocated(instr); 203 break; 204 } 205 } 206 } 207 208 209 template<typename V> 210 void Decoder<V>::DecodeLoadStore(Instruction* instr) { 211 DCHECK((instr->Bits(27, 24) == 0x8) || 212 (instr->Bits(27, 24) == 0x9) || 213 (instr->Bits(27, 24) == 0xC) || 214 (instr->Bits(27, 24) == 0xD) ); 215 216 if (instr->Bit(24) == 0) { 217 if (instr->Bit(28) == 0) { 218 if (instr->Bit(29) == 0) { 219 if (instr->Bit(26) == 0) { 220 // TODO(all): VisitLoadStoreExclusive. 221 V::VisitUnimplemented(instr); 222 } else { 223 DecodeAdvSIMDLoadStore(instr); 224 } 225 } else { 226 if ((instr->Bits(31, 30) == 0x3) || 227 (instr->Mask(0xC4400000) == 0x40000000)) { 228 V::VisitUnallocated(instr); 229 } else { 230 if (instr->Bit(23) == 0) { 231 if (instr->Mask(0xC4400000) == 0xC0400000) { 232 V::VisitUnallocated(instr); 233 } else { 234 V::VisitLoadStorePairNonTemporal(instr); 235 } 236 } else { 237 V::VisitLoadStorePairPostIndex(instr); 238 } 239 } 240 } 241 } else { 242 if (instr->Bit(29) == 0) { 243 if (instr->Mask(0xC4000000) == 0xC4000000) { 244 V::VisitUnallocated(instr); 245 } else { 246 V::VisitLoadLiteral(instr); 247 } 248 } else { 249 if ((instr->Mask(0x84C00000) == 0x80C00000) || 250 (instr->Mask(0x44800000) == 0x44800000) || 251 (instr->Mask(0x84800000) == 0x84800000)) { 252 V::VisitUnallocated(instr); 253 } else { 254 if (instr->Bit(21) == 0) { 255 switch (instr->Bits(11, 10)) { 256 case 0: { 257 V::VisitLoadStoreUnscaledOffset(instr); 258 break; 259 } 260 case 1: { 261 if (instr->Mask(0xC4C00000) == 0xC0800000) { 262 V::VisitUnallocated(instr); 263 } else { 264 V::VisitLoadStorePostIndex(instr); 265 } 266 break; 267 } 268 case 2: { 269 // TODO(all): VisitLoadStoreRegisterOffsetUnpriv. 270 V::VisitUnimplemented(instr); 271 break; 272 } 273 case 3: { 274 if (instr->Mask(0xC4C00000) == 0xC0800000) { 275 V::VisitUnallocated(instr); 276 } else { 277 V::VisitLoadStorePreIndex(instr); 278 } 279 break; 280 } 281 } 282 } else { 283 if (instr->Bits(11, 10) == 0x2) { 284 if (instr->Bit(14) == 0) { 285 V::VisitUnallocated(instr); 286 } else { 287 V::VisitLoadStoreRegisterOffset(instr); 288 } 289 } else { 290 V::VisitUnallocated(instr); 291 } 292 } 293 } 294 } 295 } 296 } else { 297 if (instr->Bit(28) == 0) { 298 if (instr->Bit(29) == 0) { 299 V::VisitUnallocated(instr); 300 } else { 301 if ((instr->Bits(31, 30) == 0x3) || 302 (instr->Mask(0xC4400000) == 0x40000000)) { 303 V::VisitUnallocated(instr); 304 } else { 305 if (instr->Bit(23) == 0) { 306 V::VisitLoadStorePairOffset(instr); 307 } else { 308 V::VisitLoadStorePairPreIndex(instr); 309 } 310 } 311 } 312 } else { 313 if (instr->Bit(29) == 0) { 314 V::VisitUnallocated(instr); 315 } else { 316 if ((instr->Mask(0x84C00000) == 0x80C00000) || 317 (instr->Mask(0x44800000) == 0x44800000) || 318 (instr->Mask(0x84800000) == 0x84800000)) { 319 V::VisitUnallocated(instr); 320 } else { 321 V::VisitLoadStoreUnsignedOffset(instr); 322 } 323 } 324 } 325 } 326 } 327 328 329 template<typename V> 330 void Decoder<V>::DecodeLogical(Instruction* instr) { 331 DCHECK(instr->Bits(27, 24) == 0x2); 332 333 if (instr->Mask(0x80400000) == 0x00400000) { 334 V::VisitUnallocated(instr); 335 } else { 336 if (instr->Bit(23) == 0) { 337 V::VisitLogicalImmediate(instr); 338 } else { 339 if (instr->Bits(30, 29) == 0x1) { 340 V::VisitUnallocated(instr); 341 } else { 342 V::VisitMoveWideImmediate(instr); 343 } 344 } 345 } 346 } 347 348 349 template<typename V> 350 void Decoder<V>::DecodeBitfieldExtract(Instruction* instr) { 351 DCHECK(instr->Bits(27, 24) == 0x3); 352 353 if ((instr->Mask(0x80400000) == 0x80000000) || 354 (instr->Mask(0x80400000) == 0x00400000) || 355 (instr->Mask(0x80008000) == 0x00008000)) { 356 V::VisitUnallocated(instr); 357 } else if (instr->Bit(23) == 0) { 358 if ((instr->Mask(0x80200000) == 0x00200000) || 359 (instr->Mask(0x60000000) == 0x60000000)) { 360 V::VisitUnallocated(instr); 361 } else { 362 V::VisitBitfield(instr); 363 } 364 } else { 365 if ((instr->Mask(0x60200000) == 0x00200000) || 366 (instr->Mask(0x60000000) != 0x00000000)) { 367 V::VisitUnallocated(instr); 368 } else { 369 V::VisitExtract(instr); 370 } 371 } 372 } 373 374 375 template<typename V> 376 void Decoder<V>::DecodeAddSubImmediate(Instruction* instr) { 377 DCHECK(instr->Bits(27, 24) == 0x1); 378 if (instr->Bit(23) == 1) { 379 V::VisitUnallocated(instr); 380 } else { 381 V::VisitAddSubImmediate(instr); 382 } 383 } 384 385 386 template<typename V> 387 void Decoder<V>::DecodeDataProcessing(Instruction* instr) { 388 DCHECK((instr->Bits(27, 24) == 0xA) || 389 (instr->Bits(27, 24) == 0xB) ); 390 391 if (instr->Bit(24) == 0) { 392 if (instr->Bit(28) == 0) { 393 if (instr->Mask(0x80008000) == 0x00008000) { 394 V::VisitUnallocated(instr); 395 } else { 396 V::VisitLogicalShifted(instr); 397 } 398 } else { 399 switch (instr->Bits(23, 21)) { 400 case 0: { 401 if (instr->Mask(0x0000FC00) != 0) { 402 V::VisitUnallocated(instr); 403 } else { 404 V::VisitAddSubWithCarry(instr); 405 } 406 break; 407 } 408 case 2: { 409 if ((instr->Bit(29) == 0) || 410 (instr->Mask(0x00000410) != 0)) { 411 V::VisitUnallocated(instr); 412 } else { 413 if (instr->Bit(11) == 0) { 414 V::VisitConditionalCompareRegister(instr); 415 } else { 416 V::VisitConditionalCompareImmediate(instr); 417 } 418 } 419 break; 420 } 421 case 4: { 422 if (instr->Mask(0x20000800) != 0x00000000) { 423 V::VisitUnallocated(instr); 424 } else { 425 V::VisitConditionalSelect(instr); 426 } 427 break; 428 } 429 case 6: { 430 if (instr->Bit(29) == 0x1) { 431 V::VisitUnallocated(instr); 432 } else { 433 if (instr->Bit(30) == 0) { 434 if ((instr->Bit(15) == 0x1) || 435 (instr->Bits(15, 11) == 0) || 436 (instr->Bits(15, 12) == 0x1) || 437 (instr->Bits(15, 12) == 0x3) || 438 (instr->Bits(15, 13) == 0x3) || 439 (instr->Mask(0x8000EC00) == 0x00004C00) || 440 (instr->Mask(0x8000E800) == 0x80004000) || 441 (instr->Mask(0x8000E400) == 0x80004000)) { 442 V::VisitUnallocated(instr); 443 } else { 444 V::VisitDataProcessing2Source(instr); 445 } 446 } else { 447 if ((instr->Bit(13) == 1) || 448 (instr->Bits(20, 16) != 0) || 449 (instr->Bits(15, 14) != 0) || 450 (instr->Mask(0xA01FFC00) == 0x00000C00) || 451 (instr->Mask(0x201FF800) == 0x00001800)) { 452 V::VisitUnallocated(instr); 453 } else { 454 V::VisitDataProcessing1Source(instr); 455 } 456 } 457 break; 458 } 459 } 460 case 1: 461 case 3: 462 case 5: 463 case 7: V::VisitUnallocated(instr); break; 464 } 465 } 466 } else { 467 if (instr->Bit(28) == 0) { 468 if (instr->Bit(21) == 0) { 469 if ((instr->Bits(23, 22) == 0x3) || 470 (instr->Mask(0x80008000) == 0x00008000)) { 471 V::VisitUnallocated(instr); 472 } else { 473 V::VisitAddSubShifted(instr); 474 } 475 } else { 476 if ((instr->Mask(0x00C00000) != 0x00000000) || 477 (instr->Mask(0x00001400) == 0x00001400) || 478 (instr->Mask(0x00001800) == 0x00001800)) { 479 V::VisitUnallocated(instr); 480 } else { 481 V::VisitAddSubExtended(instr); 482 } 483 } 484 } else { 485 if ((instr->Bit(30) == 0x1) || 486 (instr->Bits(30, 29) == 0x1) || 487 (instr->Mask(0xE0600000) == 0x00200000) || 488 (instr->Mask(0xE0608000) == 0x00400000) || 489 (instr->Mask(0x60608000) == 0x00408000) || 490 (instr->Mask(0x60E00000) == 0x00E00000) || 491 (instr->Mask(0x60E00000) == 0x00800000) || 492 (instr->Mask(0x60E00000) == 0x00600000)) { 493 V::VisitUnallocated(instr); 494 } else { 495 V::VisitDataProcessing3Source(instr); 496 } 497 } 498 } 499 } 500 501 502 template<typename V> 503 void Decoder<V>::DecodeFP(Instruction* instr) { 504 DCHECK((instr->Bits(27, 24) == 0xE) || 505 (instr->Bits(27, 24) == 0xF) ); 506 507 if (instr->Bit(28) == 0) { 508 DecodeAdvSIMDDataProcessing(instr); 509 } else { 510 if (instr->Bit(29) == 1) { 511 V::VisitUnallocated(instr); 512 } else { 513 if (instr->Bits(31, 30) == 0x3) { 514 V::VisitUnallocated(instr); 515 } else if (instr->Bits(31, 30) == 0x1) { 516 DecodeAdvSIMDDataProcessing(instr); 517 } else { 518 if (instr->Bit(24) == 0) { 519 if (instr->Bit(21) == 0) { 520 if ((instr->Bit(23) == 1) || 521 (instr->Bit(18) == 1) || 522 (instr->Mask(0x80008000) == 0x00000000) || 523 (instr->Mask(0x000E0000) == 0x00000000) || 524 (instr->Mask(0x000E0000) == 0x000A0000) || 525 (instr->Mask(0x00160000) == 0x00000000) || 526 (instr->Mask(0x00160000) == 0x00120000)) { 527 V::VisitUnallocated(instr); 528 } else { 529 V::VisitFPFixedPointConvert(instr); 530 } 531 } else { 532 if (instr->Bits(15, 10) == 32) { 533 V::VisitUnallocated(instr); 534 } else if (instr->Bits(15, 10) == 0) { 535 if ((instr->Bits(23, 22) == 0x3) || 536 (instr->Mask(0x000E0000) == 0x000A0000) || 537 (instr->Mask(0x000E0000) == 0x000C0000) || 538 (instr->Mask(0x00160000) == 0x00120000) || 539 (instr->Mask(0x00160000) == 0x00140000) || 540 (instr->Mask(0x20C40000) == 0x00800000) || 541 (instr->Mask(0x20C60000) == 0x00840000) || 542 (instr->Mask(0xA0C60000) == 0x80060000) || 543 (instr->Mask(0xA0C60000) == 0x00860000) || 544 (instr->Mask(0xA0C60000) == 0x00460000) || 545 (instr->Mask(0xA0CE0000) == 0x80860000) || 546 (instr->Mask(0xA0CE0000) == 0x804E0000) || 547 (instr->Mask(0xA0CE0000) == 0x000E0000) || 548 (instr->Mask(0xA0D60000) == 0x00160000) || 549 (instr->Mask(0xA0D60000) == 0x80560000) || 550 (instr->Mask(0xA0D60000) == 0x80960000)) { 551 V::VisitUnallocated(instr); 552 } else { 553 V::VisitFPIntegerConvert(instr); 554 } 555 } else if (instr->Bits(14, 10) == 16) { 556 const Instr masked_A0DF8000 = instr->Mask(0xA0DF8000); 557 if ((instr->Mask(0x80180000) != 0) || 558 (masked_A0DF8000 == 0x00020000) || 559 (masked_A0DF8000 == 0x00030000) || 560 (masked_A0DF8000 == 0x00068000) || 561 (masked_A0DF8000 == 0x00428000) || 562 (masked_A0DF8000 == 0x00430000) || 563 (masked_A0DF8000 == 0x00468000) || 564 (instr->Mask(0xA0D80000) == 0x00800000) || 565 (instr->Mask(0xA0DE0000) == 0x00C00000) || 566 (instr->Mask(0xA0DF0000) == 0x00C30000) || 567 (instr->Mask(0xA0DC0000) == 0x00C40000)) { 568 V::VisitUnallocated(instr); 569 } else { 570 V::VisitFPDataProcessing1Source(instr); 571 } 572 } else if (instr->Bits(13, 10) == 8) { 573 if ((instr->Bits(15, 14) != 0) || 574 (instr->Bits(2, 0) != 0) || 575 (instr->Mask(0x80800000) != 0x00000000)) { 576 V::VisitUnallocated(instr); 577 } else { 578 V::VisitFPCompare(instr); 579 } 580 } else if (instr->Bits(12, 10) == 4) { 581 if ((instr->Bits(9, 5) != 0) || 582 (instr->Mask(0x80800000) != 0x00000000)) { 583 V::VisitUnallocated(instr); 584 } else { 585 V::VisitFPImmediate(instr); 586 } 587 } else { 588 if (instr->Mask(0x80800000) != 0x00000000) { 589 V::VisitUnallocated(instr); 590 } else { 591 switch (instr->Bits(11, 10)) { 592 case 1: { 593 V::VisitFPConditionalCompare(instr); 594 break; 595 } 596 case 2: { 597 if ((instr->Bits(15, 14) == 0x3) || 598 (instr->Mask(0x00009000) == 0x00009000) || 599 (instr->Mask(0x0000A000) == 0x0000A000)) { 600 V::VisitUnallocated(instr); 601 } else { 602 V::VisitFPDataProcessing2Source(instr); 603 } 604 break; 605 } 606 case 3: { 607 V::VisitFPConditionalSelect(instr); 608 break; 609 } 610 default: UNREACHABLE(); 611 } 612 } 613 } 614 } 615 } else { 616 // Bit 30 == 1 has been handled earlier. 617 DCHECK(instr->Bit(30) == 0); 618 if (instr->Mask(0xA0800000) != 0) { 619 V::VisitUnallocated(instr); 620 } else { 621 V::VisitFPDataProcessing3Source(instr); 622 } 623 } 624 } 625 } 626 } 627 } 628 629 630 template<typename V> 631 void Decoder<V>::DecodeAdvSIMDLoadStore(Instruction* instr) { 632 // TODO(all): Implement Advanced SIMD load/store instruction decode. 633 DCHECK(instr->Bits(29, 25) == 0x6); 634 V::VisitUnimplemented(instr); 635 } 636 637 638 template<typename V> 639 void Decoder<V>::DecodeAdvSIMDDataProcessing(Instruction* instr) { 640 // TODO(all): Implement Advanced SIMD data processing instruction decode. 641 DCHECK(instr->Bits(27, 25) == 0x7); 642 V::VisitUnimplemented(instr); 643 } 644 645 646 } } // namespace v8::internal 647 648 #endif // V8_ARM64_DECODER_ARM64_INL_H_ 649
