1 //===-- ARM/ARMMCCodeEmitter.cpp - Convert ARM code to machine code -------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements the ARMMCCodeEmitter class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "MCTargetDesc/ARMMCTargetDesc.h" 15 #include "MCTargetDesc/ARMAddressingModes.h" 16 #include "MCTargetDesc/ARMBaseInfo.h" 17 #include "MCTargetDesc/ARMFixupKinds.h" 18 #include "MCTargetDesc/ARMMCExpr.h" 19 #include "llvm/ADT/APFloat.h" 20 #include "llvm/ADT/Statistic.h" 21 #include "llvm/MC/MCCodeEmitter.h" 22 #include "llvm/MC/MCContext.h" 23 #include "llvm/MC/MCExpr.h" 24 #include "llvm/MC/MCInst.h" 25 #include "llvm/MC/MCInstrInfo.h" 26 #include "llvm/MC/MCRegisterInfo.h" 27 #include "llvm/MC/MCSubtargetInfo.h" 28 #include "llvm/Support/ErrorHandling.h" 29 #include "llvm/Support/raw_ostream.h" 30 31 using namespace llvm; 32 33 #define DEBUG_TYPE "mccodeemitter" 34 35 STATISTIC(MCNumEmitted, "Number of MC instructions emitted."); 36 STATISTIC(MCNumCPRelocations, "Number of constant pool relocations created."); 37 38 namespace { 39 class ARMMCCodeEmitter : public MCCodeEmitter { 40 ARMMCCodeEmitter(const ARMMCCodeEmitter &) = delete; 41 void operator=(const ARMMCCodeEmitter &) = delete; 42 const MCInstrInfo &MCII; 43 const MCContext &CTX; 44 bool IsLittleEndian; 45 46 public: 47 ARMMCCodeEmitter(const MCInstrInfo &mcii, MCContext &ctx, bool IsLittle) 48 : MCII(mcii), CTX(ctx), IsLittleEndian(IsLittle) { 49 } 50 51 ~ARMMCCodeEmitter() override {} 52 53 bool isThumb(const MCSubtargetInfo &STI) const { 54 return (STI.getFeatureBits() & ARM::ModeThumb) != 0; 55 } 56 bool isThumb2(const MCSubtargetInfo &STI) const { 57 return isThumb(STI) && (STI.getFeatureBits() & ARM::FeatureThumb2) != 0; 58 } 59 bool isTargetMachO(const MCSubtargetInfo &STI) const { 60 Triple TT(STI.getTargetTriple()); 61 return TT.isOSBinFormatMachO(); 62 } 63 64 unsigned getMachineSoImmOpValue(unsigned SoImm) const; 65 66 // getBinaryCodeForInstr - TableGen'erated function for getting the 67 // binary encoding for an instruction. 68 uint64_t getBinaryCodeForInstr(const MCInst &MI, 69 SmallVectorImpl<MCFixup> &Fixups, 70 const MCSubtargetInfo &STI) const; 71 72 /// getMachineOpValue - Return binary encoding of operand. If the machine 73 /// operand requires relocation, record the relocation and return zero. 74 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO, 75 SmallVectorImpl<MCFixup> &Fixups, 76 const MCSubtargetInfo &STI) const; 77 78 /// getHiLo16ImmOpValue - Return the encoding for the hi / low 16-bit of 79 /// the specified operand. This is used for operands with :lower16: and 80 /// :upper16: prefixes. 81 uint32_t getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx, 82 SmallVectorImpl<MCFixup> &Fixups, 83 const MCSubtargetInfo &STI) const; 84 85 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, 86 unsigned &Reg, unsigned &Imm, 87 SmallVectorImpl<MCFixup> &Fixups, 88 const MCSubtargetInfo &STI) const; 89 90 /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate 91 /// BL branch target. 92 uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx, 93 SmallVectorImpl<MCFixup> &Fixups, 94 const MCSubtargetInfo &STI) const; 95 96 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate 97 /// BLX branch target. 98 uint32_t getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx, 99 SmallVectorImpl<MCFixup> &Fixups, 100 const MCSubtargetInfo &STI) const; 101 102 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target. 103 uint32_t getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx, 104 SmallVectorImpl<MCFixup> &Fixups, 105 const MCSubtargetInfo &STI) const; 106 107 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target. 108 uint32_t getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx, 109 SmallVectorImpl<MCFixup> &Fixups, 110 const MCSubtargetInfo &STI) const; 111 112 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target. 113 uint32_t getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx, 114 SmallVectorImpl<MCFixup> &Fixups, 115 const MCSubtargetInfo &STI) const; 116 117 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate 118 /// branch target. 119 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, 120 SmallVectorImpl<MCFixup> &Fixups, 121 const MCSubtargetInfo &STI) const; 122 123 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit 124 /// immediate Thumb2 direct branch target. 125 uint32_t getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, 126 SmallVectorImpl<MCFixup> &Fixups, 127 const MCSubtargetInfo &STI) const; 128 129 /// getARMBranchTargetOpValue - Return encoding info for 24-bit immediate 130 /// branch target. 131 uint32_t getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, 132 SmallVectorImpl<MCFixup> &Fixups, 133 const MCSubtargetInfo &STI) const; 134 uint32_t getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx, 135 SmallVectorImpl<MCFixup> &Fixups, 136 const MCSubtargetInfo &STI) const; 137 uint32_t getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx, 138 SmallVectorImpl<MCFixup> &Fixups, 139 const MCSubtargetInfo &STI) const; 140 141 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate 142 /// ADR label target. 143 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx, 144 SmallVectorImpl<MCFixup> &Fixups, 145 const MCSubtargetInfo &STI) const; 146 uint32_t getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx, 147 SmallVectorImpl<MCFixup> &Fixups, 148 const MCSubtargetInfo &STI) const; 149 uint32_t getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx, 150 SmallVectorImpl<MCFixup> &Fixups, 151 const MCSubtargetInfo &STI) const; 152 153 154 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' 155 /// operand. 156 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx, 157 SmallVectorImpl<MCFixup> &Fixups, 158 const MCSubtargetInfo &STI) const; 159 160 /// getThumbAddrModeRegRegOpValue - Return encoding for 'reg + reg' operand. 161 uint32_t getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx, 162 SmallVectorImpl<MCFixup> &Fixups, 163 const MCSubtargetInfo &STI) const; 164 165 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2' 166 /// operand. 167 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx, 168 SmallVectorImpl<MCFixup> &Fixups, 169 const MCSubtargetInfo &STI) const; 170 171 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for 'reg + imm8<<2' 172 /// operand. 173 uint32_t getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx, 174 SmallVectorImpl<MCFixup> &Fixups, 175 const MCSubtargetInfo &STI) const; 176 177 /// getT2Imm8s4OpValue - Return encoding info for '+/- imm8<<2' 178 /// operand. 179 uint32_t getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx, 180 SmallVectorImpl<MCFixup> &Fixups, 181 const MCSubtargetInfo &STI) const; 182 183 184 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm' 185 /// operand as needed by load/store instructions. 186 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx, 187 SmallVectorImpl<MCFixup> &Fixups, 188 const MCSubtargetInfo &STI) const; 189 190 /// getLdStmModeOpValue - Return encoding for load/store multiple mode. 191 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx, 192 SmallVectorImpl<MCFixup> &Fixups, 193 const MCSubtargetInfo &STI) const { 194 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm(); 195 switch (Mode) { 196 default: llvm_unreachable("Unknown addressing sub-mode!"); 197 case ARM_AM::da: return 0; 198 case ARM_AM::ia: return 1; 199 case ARM_AM::db: return 2; 200 case ARM_AM::ib: return 3; 201 } 202 } 203 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value. 204 /// 205 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const { 206 switch (ShOpc) { 207 case ARM_AM::no_shift: 208 case ARM_AM::lsl: return 0; 209 case ARM_AM::lsr: return 1; 210 case ARM_AM::asr: return 2; 211 case ARM_AM::ror: 212 case ARM_AM::rrx: return 3; 213 } 214 llvm_unreachable("Invalid ShiftOpc!"); 215 } 216 217 /// getAddrMode2OpValue - Return encoding for addrmode2 operands. 218 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx, 219 SmallVectorImpl<MCFixup> &Fixups, 220 const MCSubtargetInfo &STI) const; 221 222 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands. 223 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx, 224 SmallVectorImpl<MCFixup> &Fixups, 225 const MCSubtargetInfo &STI) const; 226 227 /// getPostIdxRegOpValue - Return encoding for postidx_reg operands. 228 uint32_t getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx, 229 SmallVectorImpl<MCFixup> &Fixups, 230 const MCSubtargetInfo &STI) const; 231 232 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands. 233 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx, 234 SmallVectorImpl<MCFixup> &Fixups, 235 const MCSubtargetInfo &STI) const; 236 237 /// getAddrMode3OpValue - Return encoding for addrmode3 operands. 238 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx, 239 SmallVectorImpl<MCFixup> &Fixups, 240 const MCSubtargetInfo &STI) const; 241 242 /// getAddrModeThumbSPOpValue - Return encoding info for 'reg +/- imm12' 243 /// operand. 244 uint32_t getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx, 245 SmallVectorImpl<MCFixup> &Fixups, 246 const MCSubtargetInfo &STI) const; 247 248 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands. 249 uint32_t getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx, 250 SmallVectorImpl<MCFixup> &Fixups, 251 const MCSubtargetInfo &STI) const; 252 253 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands. 254 uint32_t getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx, 255 SmallVectorImpl<MCFixup> &Fixups, 256 const MCSubtargetInfo &STI) const; 257 258 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand. 259 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx, 260 SmallVectorImpl<MCFixup> &Fixups, 261 const MCSubtargetInfo &STI) const; 262 263 /// getCCOutOpValue - Return encoding of the 's' bit. 264 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op, 265 SmallVectorImpl<MCFixup> &Fixups, 266 const MCSubtargetInfo &STI) const { 267 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or 268 // '1' respectively. 269 return MI.getOperand(Op).getReg() == ARM::CPSR; 270 } 271 272 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value. 273 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op, 274 SmallVectorImpl<MCFixup> &Fixups, 275 const MCSubtargetInfo &STI) const { 276 277 const MCOperand &MO = MI.getOperand(Op); 278 279 // We expect MO to be an immediate or an expression, 280 // if it is an immediate - that's fine, just encode the value. 281 // Otherwise - create a Fixup. 282 if (MO.isExpr()) { 283 const MCExpr *Expr = MO.getExpr(); 284 // In instruction code this value always encoded as lowest 12 bits, 285 // so we don't have to perform any specific adjustments. 286 // Due to requirements of relocatable records we have to use FK_Data_4. 287 // See ARMELFObjectWriter::ExplicitRelSym and 288 // ARMELFObjectWriter::GetRelocTypeInner for more details. 289 MCFixupKind Kind = MCFixupKind(FK_Data_4); 290 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc())); 291 return 0; 292 } 293 294 unsigned SoImm = MO.getImm(); 295 int SoImmVal = ARM_AM::getSOImmVal(SoImm); 296 assert(SoImmVal != -1 && "Not a valid so_imm value!"); 297 298 // Encode rotate_imm. 299 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1) 300 << ARMII::SoRotImmShift; 301 302 // Encode immed_8. 303 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal); 304 return Binary; 305 } 306 307 unsigned getModImmOpValue(const MCInst &MI, unsigned Op, 308 SmallVectorImpl<MCFixup> &Fixups, 309 const MCSubtargetInfo &ST) const { 310 const MCOperand &MO = MI.getOperand(Op); 311 312 // Support for fixups (MCFixup) 313 if (MO.isExpr()) { 314 const MCExpr *Expr = MO.getExpr(); 315 // In instruction code this value always encoded as lowest 12 bits, 316 // so we don't have to perform any specific adjustments. 317 // Due to requirements of relocatable records we have to use FK_Data_4. 318 // See ARMELFObjectWriter::ExplicitRelSym and 319 // ARMELFObjectWriter::GetRelocTypeInner for more details. 320 MCFixupKind Kind = MCFixupKind(FK_Data_4); 321 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc())); 322 return 0; 323 } 324 325 // Immediate is already in its encoded format 326 return MO.getImm(); 327 } 328 329 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value. 330 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op, 331 SmallVectorImpl<MCFixup> &Fixups, 332 const MCSubtargetInfo &STI) const { 333 unsigned SoImm = MI.getOperand(Op).getImm(); 334 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm); 335 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?"); 336 return Encoded; 337 } 338 339 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum, 340 SmallVectorImpl<MCFixup> &Fixups, 341 const MCSubtargetInfo &STI) const; 342 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum, 343 SmallVectorImpl<MCFixup> &Fixups, 344 const MCSubtargetInfo &STI) const; 345 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum, 346 SmallVectorImpl<MCFixup> &Fixups, 347 const MCSubtargetInfo &STI) const; 348 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum, 349 SmallVectorImpl<MCFixup> &Fixups, 350 const MCSubtargetInfo &STI) const; 351 352 /// getSORegOpValue - Return an encoded so_reg shifted register value. 353 unsigned getSORegRegOpValue(const MCInst &MI, unsigned Op, 354 SmallVectorImpl<MCFixup> &Fixups, 355 const MCSubtargetInfo &STI) const; 356 unsigned getSORegImmOpValue(const MCInst &MI, unsigned Op, 357 SmallVectorImpl<MCFixup> &Fixups, 358 const MCSubtargetInfo &STI) const; 359 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op, 360 SmallVectorImpl<MCFixup> &Fixups, 361 const MCSubtargetInfo &STI) const; 362 363 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op, 364 SmallVectorImpl<MCFixup> &Fixups, 365 const MCSubtargetInfo &STI) const { 366 return 64 - MI.getOperand(Op).getImm(); 367 } 368 369 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op, 370 SmallVectorImpl<MCFixup> &Fixups, 371 const MCSubtargetInfo &STI) const; 372 373 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op, 374 SmallVectorImpl<MCFixup> &Fixups, 375 const MCSubtargetInfo &STI) const; 376 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op, 377 SmallVectorImpl<MCFixup> &Fixups, 378 const MCSubtargetInfo &STI) const; 379 unsigned getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op, 380 SmallVectorImpl<MCFixup> &Fixups, 381 const MCSubtargetInfo &STI) const; 382 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op, 383 SmallVectorImpl<MCFixup> &Fixups, 384 const MCSubtargetInfo &STI) const; 385 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op, 386 SmallVectorImpl<MCFixup> &Fixups, 387 const MCSubtargetInfo &STI) const; 388 389 unsigned getShiftRight8Imm(const MCInst &MI, unsigned Op, 390 SmallVectorImpl<MCFixup> &Fixups, 391 const MCSubtargetInfo &STI) const; 392 unsigned getShiftRight16Imm(const MCInst &MI, unsigned Op, 393 SmallVectorImpl<MCFixup> &Fixups, 394 const MCSubtargetInfo &STI) const; 395 unsigned getShiftRight32Imm(const MCInst &MI, unsigned Op, 396 SmallVectorImpl<MCFixup> &Fixups, 397 const MCSubtargetInfo &STI) const; 398 unsigned getShiftRight64Imm(const MCInst &MI, unsigned Op, 399 SmallVectorImpl<MCFixup> &Fixups, 400 const MCSubtargetInfo &STI) const; 401 402 unsigned getThumbSRImmOpValue(const MCInst &MI, unsigned Op, 403 SmallVectorImpl<MCFixup> &Fixups, 404 const MCSubtargetInfo &STI) const; 405 406 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI, 407 unsigned EncodedValue, 408 const MCSubtargetInfo &STI) const; 409 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI, 410 unsigned EncodedValue, 411 const MCSubtargetInfo &STI) const; 412 unsigned NEONThumb2DupPostEncoder(const MCInst &MI, 413 unsigned EncodedValue, 414 const MCSubtargetInfo &STI) const; 415 unsigned NEONThumb2V8PostEncoder(const MCInst &MI, 416 unsigned EncodedValue, 417 const MCSubtargetInfo &STI) const; 418 419 unsigned VFPThumb2PostEncoder(const MCInst &MI, 420 unsigned EncodedValue, 421 const MCSubtargetInfo &STI) const; 422 423 void EmitByte(unsigned char C, raw_ostream &OS) const { 424 OS << (char)C; 425 } 426 427 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const { 428 // Output the constant in little endian byte order. 429 for (unsigned i = 0; i != Size; ++i) { 430 unsigned Shift = IsLittleEndian ? i * 8 : (Size - 1 - i) * 8; 431 EmitByte((Val >> Shift) & 0xff, OS); 432 } 433 } 434 435 void EncodeInstruction(const MCInst &MI, raw_ostream &OS, 436 SmallVectorImpl<MCFixup> &Fixups, 437 const MCSubtargetInfo &STI) const override; 438 }; 439 440 } // end anonymous namespace 441 442 MCCodeEmitter *llvm::createARMLEMCCodeEmitter(const MCInstrInfo &MCII, 443 const MCRegisterInfo &MRI, 444 MCContext &Ctx) { 445 return new ARMMCCodeEmitter(MCII, Ctx, true); 446 } 447 448 MCCodeEmitter *llvm::createARMBEMCCodeEmitter(const MCInstrInfo &MCII, 449 const MCRegisterInfo &MRI, 450 MCContext &Ctx) { 451 return new ARMMCCodeEmitter(MCII, Ctx, false); 452 } 453 454 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing 455 /// instructions, and rewrite them to their Thumb2 form if we are currently in 456 /// Thumb2 mode. 457 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI, 458 unsigned EncodedValue, 459 const MCSubtargetInfo &STI) const { 460 if (isThumb2(STI)) { 461 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved 462 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are 463 // set to 1111. 464 unsigned Bit24 = EncodedValue & 0x01000000; 465 unsigned Bit28 = Bit24 << 4; 466 EncodedValue &= 0xEFFFFFFF; 467 EncodedValue |= Bit28; 468 EncodedValue |= 0x0F000000; 469 } 470 471 return EncodedValue; 472 } 473 474 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store 475 /// instructions, and rewrite them to their Thumb2 form if we are currently in 476 /// Thumb2 mode. 477 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI, 478 unsigned EncodedValue, 479 const MCSubtargetInfo &STI) const { 480 if (isThumb2(STI)) { 481 EncodedValue &= 0xF0FFFFFF; 482 EncodedValue |= 0x09000000; 483 } 484 485 return EncodedValue; 486 } 487 488 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup 489 /// instructions, and rewrite them to their Thumb2 form if we are currently in 490 /// Thumb2 mode. 491 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI, 492 unsigned EncodedValue, 493 const MCSubtargetInfo &STI) const { 494 if (isThumb2(STI)) { 495 EncodedValue &= 0x00FFFFFF; 496 EncodedValue |= 0xEE000000; 497 } 498 499 return EncodedValue; 500 } 501 502 /// Post-process encoded NEON v8 instructions, and rewrite them to Thumb2 form 503 /// if we are in Thumb2. 504 unsigned ARMMCCodeEmitter::NEONThumb2V8PostEncoder(const MCInst &MI, 505 unsigned EncodedValue, 506 const MCSubtargetInfo &STI) const { 507 if (isThumb2(STI)) { 508 EncodedValue |= 0xC000000; // Set bits 27-26 509 } 510 511 return EncodedValue; 512 } 513 514 /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite 515 /// them to their Thumb2 form if we are currently in Thumb2 mode. 516 unsigned ARMMCCodeEmitter:: 517 VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue, 518 const MCSubtargetInfo &STI) const { 519 if (isThumb2(STI)) { 520 EncodedValue &= 0x0FFFFFFF; 521 EncodedValue |= 0xE0000000; 522 } 523 return EncodedValue; 524 } 525 526 /// getMachineOpValue - Return binary encoding of operand. If the machine 527 /// operand requires relocation, record the relocation and return zero. 528 unsigned ARMMCCodeEmitter:: 529 getMachineOpValue(const MCInst &MI, const MCOperand &MO, 530 SmallVectorImpl<MCFixup> &Fixups, 531 const MCSubtargetInfo &STI) const { 532 if (MO.isReg()) { 533 unsigned Reg = MO.getReg(); 534 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg); 535 536 // Q registers are encoded as 2x their register number. 537 switch (Reg) { 538 default: 539 return RegNo; 540 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3: 541 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7: 542 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11: 543 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15: 544 return 2 * RegNo; 545 } 546 } else if (MO.isImm()) { 547 return static_cast<unsigned>(MO.getImm()); 548 } else if (MO.isFPImm()) { 549 return static_cast<unsigned>(APFloat(MO.getFPImm()) 550 .bitcastToAPInt().getHiBits(32).getLimitedValue()); 551 } 552 553 llvm_unreachable("Unable to encode MCOperand!"); 554 } 555 556 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand. 557 bool ARMMCCodeEmitter:: 558 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg, 559 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups, 560 const MCSubtargetInfo &STI) const { 561 const MCOperand &MO = MI.getOperand(OpIdx); 562 const MCOperand &MO1 = MI.getOperand(OpIdx + 1); 563 564 Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); 565 566 int32_t SImm = MO1.getImm(); 567 bool isAdd = true; 568 569 // Special value for #-0 570 if (SImm == INT32_MIN) { 571 SImm = 0; 572 isAdd = false; 573 } 574 575 // Immediate is always encoded as positive. The 'U' bit controls add vs sub. 576 if (SImm < 0) { 577 SImm = -SImm; 578 isAdd = false; 579 } 580 581 Imm = SImm; 582 return isAdd; 583 } 584 585 /// getBranchTargetOpValue - Helper function to get the branch target operand, 586 /// which is either an immediate or requires a fixup. 587 static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, 588 unsigned FixupKind, 589 SmallVectorImpl<MCFixup> &Fixups, 590 const MCSubtargetInfo &STI) { 591 const MCOperand &MO = MI.getOperand(OpIdx); 592 593 // If the destination is an immediate, we have nothing to do. 594 if (MO.isImm()) return MO.getImm(); 595 assert(MO.isExpr() && "Unexpected branch target type!"); 596 const MCExpr *Expr = MO.getExpr(); 597 MCFixupKind Kind = MCFixupKind(FixupKind); 598 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc())); 599 600 // All of the information is in the fixup. 601 return 0; 602 } 603 604 // Thumb BL and BLX use a strange offset encoding where bits 22 and 21 are 605 // determined by negating them and XOR'ing them with bit 23. 606 static int32_t encodeThumbBLOffset(int32_t offset) { 607 offset >>= 1; 608 uint32_t S = (offset & 0x800000) >> 23; 609 uint32_t J1 = (offset & 0x400000) >> 22; 610 uint32_t J2 = (offset & 0x200000) >> 21; 611 J1 = (~J1 & 0x1); 612 J2 = (~J2 & 0x1); 613 J1 ^= S; 614 J2 ^= S; 615 616 offset &= ~0x600000; 617 offset |= J1 << 22; 618 offset |= J2 << 21; 619 620 return offset; 621 } 622 623 /// getThumbBLTargetOpValue - Return encoding info for immediate branch target. 624 uint32_t ARMMCCodeEmitter:: 625 getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx, 626 SmallVectorImpl<MCFixup> &Fixups, 627 const MCSubtargetInfo &STI) const { 628 const MCOperand MO = MI.getOperand(OpIdx); 629 if (MO.isExpr()) 630 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bl, 631 Fixups, STI); 632 return encodeThumbBLOffset(MO.getImm()); 633 } 634 635 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate 636 /// BLX branch target. 637 uint32_t ARMMCCodeEmitter:: 638 getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx, 639 SmallVectorImpl<MCFixup> &Fixups, 640 const MCSubtargetInfo &STI) const { 641 const MCOperand MO = MI.getOperand(OpIdx); 642 if (MO.isExpr()) 643 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_blx, 644 Fixups, STI); 645 return encodeThumbBLOffset(MO.getImm()); 646 } 647 648 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target. 649 uint32_t ARMMCCodeEmitter:: 650 getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx, 651 SmallVectorImpl<MCFixup> &Fixups, 652 const MCSubtargetInfo &STI) const { 653 const MCOperand MO = MI.getOperand(OpIdx); 654 if (MO.isExpr()) 655 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_br, 656 Fixups, STI); 657 return (MO.getImm() >> 1); 658 } 659 660 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target. 661 uint32_t ARMMCCodeEmitter:: 662 getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx, 663 SmallVectorImpl<MCFixup> &Fixups, 664 const MCSubtargetInfo &STI) const { 665 const MCOperand MO = MI.getOperand(OpIdx); 666 if (MO.isExpr()) 667 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bcc, 668 Fixups, STI); 669 return (MO.getImm() >> 1); 670 } 671 672 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target. 673 uint32_t ARMMCCodeEmitter:: 674 getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx, 675 SmallVectorImpl<MCFixup> &Fixups, 676 const MCSubtargetInfo &STI) const { 677 const MCOperand MO = MI.getOperand(OpIdx); 678 if (MO.isExpr()) 679 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups, STI); 680 return (MO.getImm() >> 1); 681 } 682 683 /// Return true if this branch has a non-always predication 684 static bool HasConditionalBranch(const MCInst &MI) { 685 int NumOp = MI.getNumOperands(); 686 if (NumOp >= 2) { 687 for (int i = 0; i < NumOp-1; ++i) { 688 const MCOperand &MCOp1 = MI.getOperand(i); 689 const MCOperand &MCOp2 = MI.getOperand(i + 1); 690 if (MCOp1.isImm() && MCOp2.isReg() && 691 (MCOp2.getReg() == 0 || MCOp2.getReg() == ARM::CPSR)) { 692 if (ARMCC::CondCodes(MCOp1.getImm()) != ARMCC::AL) 693 return true; 694 } 695 } 696 } 697 return false; 698 } 699 700 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch 701 /// target. 702 uint32_t ARMMCCodeEmitter:: 703 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, 704 SmallVectorImpl<MCFixup> &Fixups, 705 const MCSubtargetInfo &STI) const { 706 // FIXME: This really, really shouldn't use TargetMachine. We don't want 707 // coupling between MC and TM anywhere we can help it. 708 if (isThumb2(STI)) 709 return 710 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_condbranch, Fixups, STI); 711 return getARMBranchTargetOpValue(MI, OpIdx, Fixups, STI); 712 } 713 714 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch 715 /// target. 716 uint32_t ARMMCCodeEmitter:: 717 getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, 718 SmallVectorImpl<MCFixup> &Fixups, 719 const MCSubtargetInfo &STI) const { 720 const MCOperand MO = MI.getOperand(OpIdx); 721 if (MO.isExpr()) { 722 if (HasConditionalBranch(MI)) 723 return ::getBranchTargetOpValue(MI, OpIdx, 724 ARM::fixup_arm_condbranch, Fixups, STI); 725 return ::getBranchTargetOpValue(MI, OpIdx, 726 ARM::fixup_arm_uncondbranch, Fixups, STI); 727 } 728 729 return MO.getImm() >> 2; 730 } 731 732 uint32_t ARMMCCodeEmitter:: 733 getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx, 734 SmallVectorImpl<MCFixup> &Fixups, 735 const MCSubtargetInfo &STI) const { 736 const MCOperand MO = MI.getOperand(OpIdx); 737 if (MO.isExpr()) { 738 if (HasConditionalBranch(MI)) 739 return ::getBranchTargetOpValue(MI, OpIdx, 740 ARM::fixup_arm_condbl, Fixups, STI); 741 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_uncondbl, Fixups, STI); 742 } 743 744 return MO.getImm() >> 2; 745 } 746 747 uint32_t ARMMCCodeEmitter:: 748 getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx, 749 SmallVectorImpl<MCFixup> &Fixups, 750 const MCSubtargetInfo &STI) const { 751 const MCOperand MO = MI.getOperand(OpIdx); 752 if (MO.isExpr()) 753 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_blx, Fixups, STI); 754 755 return MO.getImm() >> 1; 756 } 757 758 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit 759 /// immediate branch target. 760 uint32_t ARMMCCodeEmitter:: 761 getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx, 762 SmallVectorImpl<MCFixup> &Fixups, 763 const MCSubtargetInfo &STI) const { 764 unsigned Val = 0; 765 const MCOperand MO = MI.getOperand(OpIdx); 766 767 if(MO.isExpr()) 768 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_uncondbranch, Fixups, STI); 769 else 770 Val = MO.getImm() >> 1; 771 772 bool I = (Val & 0x800000); 773 bool J1 = (Val & 0x400000); 774 bool J2 = (Val & 0x200000); 775 if (I ^ J1) 776 Val &= ~0x400000; 777 else 778 Val |= 0x400000; 779 780 if (I ^ J2) 781 Val &= ~0x200000; 782 else 783 Val |= 0x200000; 784 785 return Val; 786 } 787 788 /// getAdrLabelOpValue - Return encoding info for 12-bit shifted-immediate 789 /// ADR label target. 790 uint32_t ARMMCCodeEmitter:: 791 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx, 792 SmallVectorImpl<MCFixup> &Fixups, 793 const MCSubtargetInfo &STI) const { 794 const MCOperand MO = MI.getOperand(OpIdx); 795 if (MO.isExpr()) 796 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_adr_pcrel_12, 797 Fixups, STI); 798 int64_t offset = MO.getImm(); 799 uint32_t Val = 0x2000; 800 801 int SoImmVal; 802 if (offset == INT32_MIN) { 803 Val = 0x1000; 804 SoImmVal = 0; 805 } else if (offset < 0) { 806 Val = 0x1000; 807 offset *= -1; 808 SoImmVal = ARM_AM::getSOImmVal(offset); 809 if(SoImmVal == -1) { 810 Val = 0x2000; 811 offset *= -1; 812 SoImmVal = ARM_AM::getSOImmVal(offset); 813 } 814 } else { 815 SoImmVal = ARM_AM::getSOImmVal(offset); 816 if(SoImmVal == -1) { 817 Val = 0x1000; 818 offset *= -1; 819 SoImmVal = ARM_AM::getSOImmVal(offset); 820 } 821 } 822 823 assert(SoImmVal != -1 && "Not a valid so_imm value!"); 824 825 Val |= SoImmVal; 826 return Val; 827 } 828 829 /// getT2AdrLabelOpValue - Return encoding info for 12-bit immediate ADR label 830 /// target. 831 uint32_t ARMMCCodeEmitter:: 832 getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx, 833 SmallVectorImpl<MCFixup> &Fixups, 834 const MCSubtargetInfo &STI) const { 835 const MCOperand MO = MI.getOperand(OpIdx); 836 if (MO.isExpr()) 837 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_adr_pcrel_12, 838 Fixups, STI); 839 int32_t Val = MO.getImm(); 840 if (Val == INT32_MIN) 841 Val = 0x1000; 842 else if (Val < 0) { 843 Val *= -1; 844 Val |= 0x1000; 845 } 846 return Val; 847 } 848 849 /// getThumbAdrLabelOpValue - Return encoding info for 8-bit immediate ADR label 850 /// target. 851 uint32_t ARMMCCodeEmitter:: 852 getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx, 853 SmallVectorImpl<MCFixup> &Fixups, 854 const MCSubtargetInfo &STI) const { 855 const MCOperand MO = MI.getOperand(OpIdx); 856 if (MO.isExpr()) 857 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_thumb_adr_pcrel_10, 858 Fixups, STI); 859 return MO.getImm(); 860 } 861 862 /// getThumbAddrModeRegRegOpValue - Return encoding info for 'reg + reg' 863 /// operand. 864 uint32_t ARMMCCodeEmitter:: 865 getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx, 866 SmallVectorImpl<MCFixup> &, 867 const MCSubtargetInfo &STI) const { 868 // [Rn, Rm] 869 // {5-3} = Rm 870 // {2-0} = Rn 871 const MCOperand &MO1 = MI.getOperand(OpIdx); 872 const MCOperand &MO2 = MI.getOperand(OpIdx + 1); 873 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg()); 874 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO2.getReg()); 875 return (Rm << 3) | Rn; 876 } 877 878 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand. 879 uint32_t ARMMCCodeEmitter:: 880 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx, 881 SmallVectorImpl<MCFixup> &Fixups, 882 const MCSubtargetInfo &STI) const { 883 // {17-13} = reg 884 // {12} = (U)nsigned (add == '1', sub == '0') 885 // {11-0} = imm12 886 unsigned Reg, Imm12; 887 bool isAdd = true; 888 // If The first operand isn't a register, we have a label reference. 889 const MCOperand &MO = MI.getOperand(OpIdx); 890 if (!MO.isReg()) { 891 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC. 892 Imm12 = 0; 893 894 if (MO.isExpr()) { 895 const MCExpr *Expr = MO.getExpr(); 896 isAdd = false ; // 'U' bit is set as part of the fixup. 897 898 MCFixupKind Kind; 899 if (isThumb2(STI)) 900 Kind = MCFixupKind(ARM::fixup_t2_ldst_pcrel_12); 901 else 902 Kind = MCFixupKind(ARM::fixup_arm_ldst_pcrel_12); 903 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc())); 904 905 ++MCNumCPRelocations; 906 } else { 907 Reg = ARM::PC; 908 int32_t Offset = MO.getImm(); 909 if (Offset == INT32_MIN) { 910 Offset = 0; 911 isAdd = false; 912 } else if (Offset < 0) { 913 Offset *= -1; 914 isAdd = false; 915 } 916 Imm12 = Offset; 917 } 918 } else 919 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups, STI); 920 921 uint32_t Binary = Imm12 & 0xfff; 922 // Immediate is always encoded as positive. The 'U' bit controls add vs sub. 923 if (isAdd) 924 Binary |= (1 << 12); 925 Binary |= (Reg << 13); 926 return Binary; 927 } 928 929 /// getT2Imm8s4OpValue - Return encoding info for 930 /// '+/- imm8<<2' operand. 931 uint32_t ARMMCCodeEmitter:: 932 getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx, 933 SmallVectorImpl<MCFixup> &Fixups, 934 const MCSubtargetInfo &STI) const { 935 // FIXME: The immediate operand should have already been encoded like this 936 // before ever getting here. The encoder method should just need to combine 937 // the MI operands for the register and the offset into a single 938 // representation for the complex operand in the .td file. This isn't just 939 // style, unfortunately. As-is, we can't represent the distinct encoding 940 // for #-0. 941 942 // {8} = (U)nsigned (add == '1', sub == '0') 943 // {7-0} = imm8 944 int32_t Imm8 = MI.getOperand(OpIdx).getImm(); 945 bool isAdd = Imm8 >= 0; 946 947 // Immediate is always encoded as positive. The 'U' bit controls add vs sub. 948 if (Imm8 < 0) 949 Imm8 = -(uint32_t)Imm8; 950 951 // Scaled by 4. 952 Imm8 /= 4; 953 954 uint32_t Binary = Imm8 & 0xff; 955 // Immediate is always encoded as positive. The 'U' bit controls add vs sub. 956 if (isAdd) 957 Binary |= (1 << 8); 958 return Binary; 959 } 960 961 /// getT2AddrModeImm8s4OpValue - Return encoding info for 962 /// 'reg +/- imm8<<2' operand. 963 uint32_t ARMMCCodeEmitter:: 964 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx, 965 SmallVectorImpl<MCFixup> &Fixups, 966 const MCSubtargetInfo &STI) const { 967 // {12-9} = reg 968 // {8} = (U)nsigned (add == '1', sub == '0') 969 // {7-0} = imm8 970 unsigned Reg, Imm8; 971 bool isAdd = true; 972 // If The first operand isn't a register, we have a label reference. 973 const MCOperand &MO = MI.getOperand(OpIdx); 974 if (!MO.isReg()) { 975 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC. 976 Imm8 = 0; 977 isAdd = false ; // 'U' bit is set as part of the fixup. 978 979 assert(MO.isExpr() && "Unexpected machine operand type!"); 980 const MCExpr *Expr = MO.getExpr(); 981 MCFixupKind Kind = MCFixupKind(ARM::fixup_t2_pcrel_10); 982 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc())); 983 984 ++MCNumCPRelocations; 985 } else 986 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups, STI); 987 988 // FIXME: The immediate operand should have already been encoded like this 989 // before ever getting here. The encoder method should just need to combine 990 // the MI operands for the register and the offset into a single 991 // representation for the complex operand in the .td file. This isn't just 992 // style, unfortunately. As-is, we can't represent the distinct encoding 993 // for #-0. 994 uint32_t Binary = (Imm8 >> 2) & 0xff; 995 // Immediate is always encoded as positive. The 'U' bit controls add vs sub. 996 if (isAdd) 997 Binary |= (1 << 8); 998 Binary |= (Reg << 9); 999 return Binary; 1000 } 1001 1002 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for 1003 /// 'reg + imm8<<2' operand. 1004 uint32_t ARMMCCodeEmitter:: 1005 getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx, 1006 SmallVectorImpl<MCFixup> &Fixups, 1007 const MCSubtargetInfo &STI) const { 1008 // {11-8} = reg 1009 // {7-0} = imm8 1010 const MCOperand &MO = MI.getOperand(OpIdx); 1011 const MCOperand &MO1 = MI.getOperand(OpIdx + 1); 1012 unsigned Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); 1013 unsigned Imm8 = MO1.getImm(); 1014 return (Reg << 8) | Imm8; 1015 } 1016 1017 uint32_t 1018 ARMMCCodeEmitter::getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx, 1019 SmallVectorImpl<MCFixup> &Fixups, 1020 const MCSubtargetInfo &STI) const { 1021 // {20-16} = imm{15-12} 1022 // {11-0} = imm{11-0} 1023 const MCOperand &MO = MI.getOperand(OpIdx); 1024 if (MO.isImm()) 1025 // Hi / lo 16 bits already extracted during earlier passes. 1026 return static_cast<unsigned>(MO.getImm()); 1027 1028 // Handle :upper16: and :lower16: assembly prefixes. 1029 const MCExpr *E = MO.getExpr(); 1030 MCFixupKind Kind; 1031 if (E->getKind() == MCExpr::Target) { 1032 const ARMMCExpr *ARM16Expr = cast<ARMMCExpr>(E); 1033 E = ARM16Expr->getSubExpr(); 1034 1035 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(E)) { 1036 const int64_t Value = MCE->getValue(); 1037 if (Value > UINT32_MAX) 1038 report_fatal_error("constant value truncated (limited to 32-bit)"); 1039 1040 switch (ARM16Expr->getKind()) { 1041 case ARMMCExpr::VK_ARM_HI16: 1042 return (int32_t(Value) & 0xffff0000) >> 16; 1043 case ARMMCExpr::VK_ARM_LO16: 1044 return (int32_t(Value) & 0x0000ffff); 1045 default: llvm_unreachable("Unsupported ARMFixup"); 1046 } 1047 } 1048 1049 switch (ARM16Expr->getKind()) { 1050 default: llvm_unreachable("Unsupported ARMFixup"); 1051 case ARMMCExpr::VK_ARM_HI16: 1052 Kind = MCFixupKind(isThumb2(STI) ? ARM::fixup_t2_movt_hi16 1053 : ARM::fixup_arm_movt_hi16); 1054 break; 1055 case ARMMCExpr::VK_ARM_LO16: 1056 Kind = MCFixupKind(isThumb2(STI) ? ARM::fixup_t2_movw_lo16 1057 : ARM::fixup_arm_movw_lo16); 1058 break; 1059 } 1060 1061 Fixups.push_back(MCFixup::Create(0, E, Kind, MI.getLoc())); 1062 return 0; 1063 } 1064 // If the expression doesn't have :upper16: or :lower16: on it, 1065 // it's just a plain immediate expression, previously those evaluated to 1066 // the lower 16 bits of the expression regardless of whether 1067 // we have a movt or a movw, but that led to misleadingly results. 1068 // This is now disallowed in the the AsmParser in validateInstruction() 1069 // so this should never happen. 1070 llvm_unreachable("expression without :upper16: or :lower16:"); 1071 } 1072 1073 uint32_t ARMMCCodeEmitter:: 1074 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx, 1075 SmallVectorImpl<MCFixup> &Fixups, 1076 const MCSubtargetInfo &STI) const { 1077 const MCOperand &MO = MI.getOperand(OpIdx); 1078 const MCOperand &MO1 = MI.getOperand(OpIdx+1); 1079 const MCOperand &MO2 = MI.getOperand(OpIdx+2); 1080 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); 1081 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg()); 1082 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm()); 1083 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add; 1084 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm()); 1085 unsigned SBits = getShiftOp(ShOp); 1086 1087 // While "lsr #32" and "asr #32" exist, they are encoded with a 0 in the shift 1088 // amount. However, it would be an easy mistake to make so check here. 1089 assert((ShImm & ~0x1f) == 0 && "Out of range shift amount"); 1090 1091 // {16-13} = Rn 1092 // {12} = isAdd 1093 // {11-0} = shifter 1094 // {3-0} = Rm 1095 // {4} = 0 1096 // {6-5} = type 1097 // {11-7} = imm 1098 uint32_t Binary = Rm; 1099 Binary |= Rn << 13; 1100 Binary |= SBits << 5; 1101 Binary |= ShImm << 7; 1102 if (isAdd) 1103 Binary |= 1 << 12; 1104 return Binary; 1105 } 1106 1107 uint32_t ARMMCCodeEmitter:: 1108 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx, 1109 SmallVectorImpl<MCFixup> &Fixups, 1110 const MCSubtargetInfo &STI) const { 1111 // {17-14} Rn 1112 // {13} 1 == imm12, 0 == Rm 1113 // {12} isAdd 1114 // {11-0} imm12/Rm 1115 const MCOperand &MO = MI.getOperand(OpIdx); 1116 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); 1117 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups, STI); 1118 Binary |= Rn << 14; 1119 return Binary; 1120 } 1121 1122 uint32_t ARMMCCodeEmitter:: 1123 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx, 1124 SmallVectorImpl<MCFixup> &Fixups, 1125 const MCSubtargetInfo &STI) const { 1126 // {13} 1 == imm12, 0 == Rm 1127 // {12} isAdd 1128 // {11-0} imm12/Rm 1129 const MCOperand &MO = MI.getOperand(OpIdx); 1130 const MCOperand &MO1 = MI.getOperand(OpIdx+1); 1131 unsigned Imm = MO1.getImm(); 1132 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add; 1133 bool isReg = MO.getReg() != 0; 1134 uint32_t Binary = ARM_AM::getAM2Offset(Imm); 1135 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12 1136 if (isReg) { 1137 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm); 1138 Binary <<= 7; // Shift amount is bits [11:7] 1139 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5] 1140 Binary |= CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); // Rm is bits [3:0] 1141 } 1142 return Binary | (isAdd << 12) | (isReg << 13); 1143 } 1144 1145 uint32_t ARMMCCodeEmitter:: 1146 getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx, 1147 SmallVectorImpl<MCFixup> &Fixups, 1148 const MCSubtargetInfo &STI) const { 1149 // {4} isAdd 1150 // {3-0} Rm 1151 const MCOperand &MO = MI.getOperand(OpIdx); 1152 const MCOperand &MO1 = MI.getOperand(OpIdx+1); 1153 bool isAdd = MO1.getImm() != 0; 1154 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg()) | (isAdd << 4); 1155 } 1156 1157 uint32_t ARMMCCodeEmitter:: 1158 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx, 1159 SmallVectorImpl<MCFixup> &Fixups, 1160 const MCSubtargetInfo &STI) const { 1161 // {9} 1 == imm8, 0 == Rm 1162 // {8} isAdd 1163 // {7-4} imm7_4/zero 1164 // {3-0} imm3_0/Rm 1165 const MCOperand &MO = MI.getOperand(OpIdx); 1166 const MCOperand &MO1 = MI.getOperand(OpIdx+1); 1167 unsigned Imm = MO1.getImm(); 1168 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add; 1169 bool isImm = MO.getReg() == 0; 1170 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm); 1171 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8 1172 if (!isImm) 1173 Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); 1174 return Imm8 | (isAdd << 8) | (isImm << 9); 1175 } 1176 1177 uint32_t ARMMCCodeEmitter:: 1178 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx, 1179 SmallVectorImpl<MCFixup> &Fixups, 1180 const MCSubtargetInfo &STI) const { 1181 // {13} 1 == imm8, 0 == Rm 1182 // {12-9} Rn 1183 // {8} isAdd 1184 // {7-4} imm7_4/zero 1185 // {3-0} imm3_0/Rm 1186 const MCOperand &MO = MI.getOperand(OpIdx); 1187 const MCOperand &MO1 = MI.getOperand(OpIdx+1); 1188 const MCOperand &MO2 = MI.getOperand(OpIdx+2); 1189 1190 // If The first operand isn't a register, we have a label reference. 1191 if (!MO.isReg()) { 1192 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC. 1193 1194 assert(MO.isExpr() && "Unexpected machine operand type!"); 1195 const MCExpr *Expr = MO.getExpr(); 1196 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10_unscaled); 1197 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc())); 1198 1199 ++MCNumCPRelocations; 1200 return (Rn << 9) | (1 << 13); 1201 } 1202 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); 1203 unsigned Imm = MO2.getImm(); 1204 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add; 1205 bool isImm = MO1.getReg() == 0; 1206 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm); 1207 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8 1208 if (!isImm) 1209 Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg()); 1210 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13); 1211 } 1212 1213 /// getAddrModeThumbSPOpValue - Encode the t_addrmode_sp operands. 1214 uint32_t ARMMCCodeEmitter:: 1215 getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx, 1216 SmallVectorImpl<MCFixup> &Fixups, 1217 const MCSubtargetInfo &STI) const { 1218 // [SP, #imm] 1219 // {7-0} = imm8 1220 const MCOperand &MO1 = MI.getOperand(OpIdx + 1); 1221 assert(MI.getOperand(OpIdx).getReg() == ARM::SP && 1222 "Unexpected base register!"); 1223 1224 // The immediate is already shifted for the implicit zeroes, so no change 1225 // here. 1226 return MO1.getImm() & 0xff; 1227 } 1228 1229 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands. 1230 uint32_t ARMMCCodeEmitter:: 1231 getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx, 1232 SmallVectorImpl<MCFixup> &Fixups, 1233 const MCSubtargetInfo &STI) const { 1234 // [Rn, #imm] 1235 // {7-3} = imm5 1236 // {2-0} = Rn 1237 const MCOperand &MO = MI.getOperand(OpIdx); 1238 const MCOperand &MO1 = MI.getOperand(OpIdx + 1); 1239 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); 1240 unsigned Imm5 = MO1.getImm(); 1241 return ((Imm5 & 0x1f) << 3) | Rn; 1242 } 1243 1244 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands. 1245 uint32_t ARMMCCodeEmitter:: 1246 getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx, 1247 SmallVectorImpl<MCFixup> &Fixups, 1248 const MCSubtargetInfo &STI) const { 1249 const MCOperand MO = MI.getOperand(OpIdx); 1250 if (MO.isExpr()) 1251 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cp, Fixups, STI); 1252 return (MO.getImm() >> 2); 1253 } 1254 1255 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand. 1256 uint32_t ARMMCCodeEmitter:: 1257 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx, 1258 SmallVectorImpl<MCFixup> &Fixups, 1259 const MCSubtargetInfo &STI) const { 1260 // {12-9} = reg 1261 // {8} = (U)nsigned (add == '1', sub == '0') 1262 // {7-0} = imm8 1263 unsigned Reg, Imm8; 1264 bool isAdd; 1265 // If The first operand isn't a register, we have a label reference. 1266 const MCOperand &MO = MI.getOperand(OpIdx); 1267 if (!MO.isReg()) { 1268 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC. 1269 Imm8 = 0; 1270 isAdd = false; // 'U' bit is handled as part of the fixup. 1271 1272 assert(MO.isExpr() && "Unexpected machine operand type!"); 1273 const MCExpr *Expr = MO.getExpr(); 1274 MCFixupKind Kind; 1275 if (isThumb2(STI)) 1276 Kind = MCFixupKind(ARM::fixup_t2_pcrel_10); 1277 else 1278 Kind = MCFixupKind(ARM::fixup_arm_pcrel_10); 1279 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc())); 1280 1281 ++MCNumCPRelocations; 1282 } else { 1283 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups, STI); 1284 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add; 1285 } 1286 1287 uint32_t Binary = ARM_AM::getAM5Offset(Imm8); 1288 // Immediate is always encoded as positive. The 'U' bit controls add vs sub. 1289 if (isAdd) 1290 Binary |= (1 << 8); 1291 Binary |= (Reg << 9); 1292 return Binary; 1293 } 1294 1295 unsigned ARMMCCodeEmitter:: 1296 getSORegRegOpValue(const MCInst &MI, unsigned OpIdx, 1297 SmallVectorImpl<MCFixup> &Fixups, 1298 const MCSubtargetInfo &STI) const { 1299 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be 1300 // shifted. The second is Rs, the amount to shift by, and the third specifies 1301 // the type of the shift. 1302 // 1303 // {3-0} = Rm. 1304 // {4} = 1 1305 // {6-5} = type 1306 // {11-8} = Rs 1307 // {7} = 0 1308 1309 const MCOperand &MO = MI.getOperand(OpIdx); 1310 const MCOperand &MO1 = MI.getOperand(OpIdx + 1); 1311 const MCOperand &MO2 = MI.getOperand(OpIdx + 2); 1312 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm()); 1313 1314 // Encode Rm. 1315 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); 1316 1317 // Encode the shift opcode. 1318 unsigned SBits = 0; 1319 unsigned Rs = MO1.getReg(); 1320 if (Rs) { 1321 // Set shift operand (bit[7:4]). 1322 // LSL - 0001 1323 // LSR - 0011 1324 // ASR - 0101 1325 // ROR - 0111 1326 switch (SOpc) { 1327 default: llvm_unreachable("Unknown shift opc!"); 1328 case ARM_AM::lsl: SBits = 0x1; break; 1329 case ARM_AM::lsr: SBits = 0x3; break; 1330 case ARM_AM::asr: SBits = 0x5; break; 1331 case ARM_AM::ror: SBits = 0x7; break; 1332 } 1333 } 1334 1335 Binary |= SBits << 4; 1336 1337 // Encode the shift operation Rs. 1338 // Encode Rs bit[11:8]. 1339 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0); 1340 return Binary | (CTX.getRegisterInfo()->getEncodingValue(Rs) << ARMII::RegRsShift); 1341 } 1342 1343 unsigned ARMMCCodeEmitter:: 1344 getSORegImmOpValue(const MCInst &MI, unsigned OpIdx, 1345 SmallVectorImpl<MCFixup> &Fixups, 1346 const MCSubtargetInfo &STI) const { 1347 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be 1348 // shifted. The second is the amount to shift by. 1349 // 1350 // {3-0} = Rm. 1351 // {4} = 0 1352 // {6-5} = type 1353 // {11-7} = imm 1354 1355 const MCOperand &MO = MI.getOperand(OpIdx); 1356 const MCOperand &MO1 = MI.getOperand(OpIdx + 1); 1357 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm()); 1358 1359 // Encode Rm. 1360 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); 1361 1362 // Encode the shift opcode. 1363 unsigned SBits = 0; 1364 1365 // Set shift operand (bit[6:4]). 1366 // LSL - 000 1367 // LSR - 010 1368 // ASR - 100 1369 // ROR - 110 1370 // RRX - 110 and bit[11:8] clear. 1371 switch (SOpc) { 1372 default: llvm_unreachable("Unknown shift opc!"); 1373 case ARM_AM::lsl: SBits = 0x0; break; 1374 case ARM_AM::lsr: SBits = 0x2; break; 1375 case ARM_AM::asr: SBits = 0x4; break; 1376 case ARM_AM::ror: SBits = 0x6; break; 1377 case ARM_AM::rrx: 1378 Binary |= 0x60; 1379 return Binary; 1380 } 1381 1382 // Encode shift_imm bit[11:7]. 1383 Binary |= SBits << 4; 1384 unsigned Offset = ARM_AM::getSORegOffset(MO1.getImm()); 1385 assert(Offset < 32 && "Offset must be in range 0-31!"); 1386 return Binary | (Offset << 7); 1387 } 1388 1389 1390 unsigned ARMMCCodeEmitter:: 1391 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum, 1392 SmallVectorImpl<MCFixup> &Fixups, 1393 const MCSubtargetInfo &STI) const { 1394 const MCOperand &MO1 = MI.getOperand(OpNum); 1395 const MCOperand &MO2 = MI.getOperand(OpNum+1); 1396 const MCOperand &MO3 = MI.getOperand(OpNum+2); 1397 1398 // Encoded as [Rn, Rm, imm]. 1399 // FIXME: Needs fixup support. 1400 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg()); 1401 Value <<= 4; 1402 Value |= CTX.getRegisterInfo()->getEncodingValue(MO2.getReg()); 1403 Value <<= 2; 1404 Value |= MO3.getImm(); 1405 1406 return Value; 1407 } 1408 1409 unsigned ARMMCCodeEmitter:: 1410 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum, 1411 SmallVectorImpl<MCFixup> &Fixups, 1412 const MCSubtargetInfo &STI) const { 1413 const MCOperand &MO1 = MI.getOperand(OpNum); 1414 const MCOperand &MO2 = MI.getOperand(OpNum+1); 1415 1416 // FIXME: Needs fixup support. 1417 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg()); 1418 1419 // Even though the immediate is 8 bits long, we need 9 bits in order 1420 // to represent the (inverse of the) sign bit. 1421 Value <<= 9; 1422 int32_t tmp = (int32_t)MO2.getImm(); 1423 if (tmp < 0) 1424 tmp = abs(tmp); 1425 else 1426 Value |= 256; // Set the ADD bit 1427 Value |= tmp & 255; 1428 return Value; 1429 } 1430 1431 unsigned ARMMCCodeEmitter:: 1432 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum, 1433 SmallVectorImpl<MCFixup> &Fixups, 1434 const MCSubtargetInfo &STI) const { 1435 const MCOperand &MO1 = MI.getOperand(OpNum); 1436 1437 // FIXME: Needs fixup support. 1438 unsigned Value = 0; 1439 int32_t tmp = (int32_t)MO1.getImm(); 1440 if (tmp < 0) 1441 tmp = abs(tmp); 1442 else 1443 Value |= 256; // Set the ADD bit 1444 Value |= tmp & 255; 1445 return Value; 1446 } 1447 1448 unsigned ARMMCCodeEmitter:: 1449 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum, 1450 SmallVectorImpl<MCFixup> &Fixups, 1451 const MCSubtargetInfo &STI) const { 1452 const MCOperand &MO1 = MI.getOperand(OpNum); 1453 1454 // FIXME: Needs fixup support. 1455 unsigned Value = 0; 1456 int32_t tmp = (int32_t)MO1.getImm(); 1457 if (tmp < 0) 1458 tmp = abs(tmp); 1459 else 1460 Value |= 4096; // Set the ADD bit 1461 Value |= tmp & 4095; 1462 return Value; 1463 } 1464 1465 unsigned ARMMCCodeEmitter:: 1466 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx, 1467 SmallVectorImpl<MCFixup> &Fixups, 1468 const MCSubtargetInfo &STI) const { 1469 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be 1470 // shifted. The second is the amount to shift by. 1471 // 1472 // {3-0} = Rm. 1473 // {4} = 0 1474 // {6-5} = type 1475 // {11-7} = imm 1476 1477 const MCOperand &MO = MI.getOperand(OpIdx); 1478 const MCOperand &MO1 = MI.getOperand(OpIdx + 1); 1479 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm()); 1480 1481 // Encode Rm. 1482 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); 1483 1484 // Encode the shift opcode. 1485 unsigned SBits = 0; 1486 // Set shift operand (bit[6:4]). 1487 // LSL - 000 1488 // LSR - 010 1489 // ASR - 100 1490 // ROR - 110 1491 switch (SOpc) { 1492 default: llvm_unreachable("Unknown shift opc!"); 1493 case ARM_AM::lsl: SBits = 0x0; break; 1494 case ARM_AM::lsr: SBits = 0x2; break; 1495 case ARM_AM::asr: SBits = 0x4; break; 1496 case ARM_AM::rrx: // FALLTHROUGH 1497 case ARM_AM::ror: SBits = 0x6; break; 1498 } 1499 1500 Binary |= SBits << 4; 1501 if (SOpc == ARM_AM::rrx) 1502 return Binary; 1503 1504 // Encode shift_imm bit[11:7]. 1505 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7; 1506 } 1507 1508 unsigned ARMMCCodeEmitter:: 1509 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op, 1510 SmallVectorImpl<MCFixup> &Fixups, 1511 const MCSubtargetInfo &STI) const { 1512 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the 1513 // msb of the mask. 1514 const MCOperand &MO = MI.getOperand(Op); 1515 uint32_t v = ~MO.getImm(); 1516 uint32_t lsb = countTrailingZeros(v); 1517 uint32_t msb = (32 - countLeadingZeros (v)) - 1; 1518 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!"); 1519 return lsb | (msb << 5); 1520 } 1521 1522 unsigned ARMMCCodeEmitter:: 1523 getRegisterListOpValue(const MCInst &MI, unsigned Op, 1524 SmallVectorImpl<MCFixup> &Fixups, 1525 const MCSubtargetInfo &STI) const { 1526 // VLDM/VSTM: 1527 // {12-8} = Vd 1528 // {7-0} = Number of registers 1529 // 1530 // LDM/STM: 1531 // {15-0} = Bitfield of GPRs. 1532 unsigned Reg = MI.getOperand(Op).getReg(); 1533 bool SPRRegs = ARMMCRegisterClasses[ARM::SPRRegClassID].contains(Reg); 1534 bool DPRRegs = ARMMCRegisterClasses[ARM::DPRRegClassID].contains(Reg); 1535 1536 unsigned Binary = 0; 1537 1538 if (SPRRegs || DPRRegs) { 1539 // VLDM/VSTM 1540 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg); 1541 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff; 1542 Binary |= (RegNo & 0x1f) << 8; 1543 if (SPRRegs) 1544 Binary |= NumRegs; 1545 else 1546 Binary |= NumRegs * 2; 1547 } else { 1548 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) { 1549 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(MI.getOperand(I).getReg()); 1550 Binary |= 1 << RegNo; 1551 } 1552 } 1553 1554 return Binary; 1555 } 1556 1557 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along 1558 /// with the alignment operand. 1559 unsigned ARMMCCodeEmitter:: 1560 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op, 1561 SmallVectorImpl<MCFixup> &Fixups, 1562 const MCSubtargetInfo &STI) const { 1563 const MCOperand &Reg = MI.getOperand(Op); 1564 const MCOperand &Imm = MI.getOperand(Op + 1); 1565 1566 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg()); 1567 unsigned Align = 0; 1568 1569 switch (Imm.getImm()) { 1570 default: break; 1571 case 2: 1572 case 4: 1573 case 8: Align = 0x01; break; 1574 case 16: Align = 0x02; break; 1575 case 32: Align = 0x03; break; 1576 } 1577 1578 return RegNo | (Align << 4); 1579 } 1580 1581 /// getAddrMode6OneLane32AddressOpValue - Encode an addrmode6 register number 1582 /// along with the alignment operand for use in VST1 and VLD1 with size 32. 1583 unsigned ARMMCCodeEmitter:: 1584 getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op, 1585 SmallVectorImpl<MCFixup> &Fixups, 1586 const MCSubtargetInfo &STI) const { 1587 const MCOperand &Reg = MI.getOperand(Op); 1588 const MCOperand &Imm = MI.getOperand(Op + 1); 1589 1590 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg()); 1591 unsigned Align = 0; 1592 1593 switch (Imm.getImm()) { 1594 default: break; 1595 case 8: 1596 case 16: 1597 case 32: // Default '0' value for invalid alignments of 8, 16, 32 bytes. 1598 case 2: Align = 0x00; break; 1599 case 4: Align = 0x03; break; 1600 } 1601 1602 return RegNo | (Align << 4); 1603 } 1604 1605 1606 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and 1607 /// alignment operand for use in VLD-dup instructions. This is the same as 1608 /// getAddrMode6AddressOpValue except for the alignment encoding, which is 1609 /// different for VLD4-dup. 1610 unsigned ARMMCCodeEmitter:: 1611 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op, 1612 SmallVectorImpl<MCFixup> &Fixups, 1613 const MCSubtargetInfo &STI) const { 1614 const MCOperand &Reg = MI.getOperand(Op); 1615 const MCOperand &Imm = MI.getOperand(Op + 1); 1616 1617 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg()); 1618 unsigned Align = 0; 1619 1620 switch (Imm.getImm()) { 1621 default: break; 1622 case 2: 1623 case 4: 1624 case 8: Align = 0x01; break; 1625 case 16: Align = 0x03; break; 1626 } 1627 1628 return RegNo | (Align << 4); 1629 } 1630 1631 unsigned ARMMCCodeEmitter:: 1632 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op, 1633 SmallVectorImpl<MCFixup> &Fixups, 1634 const MCSubtargetInfo &STI) const { 1635 const MCOperand &MO = MI.getOperand(Op); 1636 if (MO.getReg() == 0) return 0x0D; 1637 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); 1638 } 1639 1640 unsigned ARMMCCodeEmitter:: 1641 getShiftRight8Imm(const MCInst &MI, unsigned Op, 1642 SmallVectorImpl<MCFixup> &Fixups, 1643 const MCSubtargetInfo &STI) const { 1644 return 8 - MI.getOperand(Op).getImm(); 1645 } 1646 1647 unsigned ARMMCCodeEmitter:: 1648 getShiftRight16Imm(const MCInst &MI, unsigned Op, 1649 SmallVectorImpl<MCFixup> &Fixups, 1650 const MCSubtargetInfo &STI) const { 1651 return 16 - MI.getOperand(Op).getImm(); 1652 } 1653 1654 unsigned ARMMCCodeEmitter:: 1655 getShiftRight32Imm(const MCInst &MI, unsigned Op, 1656 SmallVectorImpl<MCFixup> &Fixups, 1657 const MCSubtargetInfo &STI) const { 1658 return 32 - MI.getOperand(Op).getImm(); 1659 } 1660 1661 unsigned ARMMCCodeEmitter:: 1662 getShiftRight64Imm(const MCInst &MI, unsigned Op, 1663 SmallVectorImpl<MCFixup> &Fixups, 1664 const MCSubtargetInfo &STI) const { 1665 return 64 - MI.getOperand(Op).getImm(); 1666 } 1667 1668 void ARMMCCodeEmitter:: 1669 EncodeInstruction(const MCInst &MI, raw_ostream &OS, 1670 SmallVectorImpl<MCFixup> &Fixups, 1671 const MCSubtargetInfo &STI) const { 1672 // Pseudo instructions don't get encoded. 1673 const MCInstrDesc &Desc = MCII.get(MI.getOpcode()); 1674 uint64_t TSFlags = Desc.TSFlags; 1675 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo) 1676 return; 1677 1678 int Size; 1679 if (Desc.getSize() == 2 || Desc.getSize() == 4) 1680 Size = Desc.getSize(); 1681 else 1682 llvm_unreachable("Unexpected instruction size!"); 1683 1684 uint32_t Binary = getBinaryCodeForInstr(MI, Fixups, STI); 1685 // Thumb 32-bit wide instructions need to emit the high order halfword 1686 // first. 1687 if (isThumb(STI) && Size == 4) { 1688 EmitConstant(Binary >> 16, 2, OS); 1689 EmitConstant(Binary & 0xffff, 2, OS); 1690 } else 1691 EmitConstant(Binary, Size, OS); 1692 ++MCNumEmitted; // Keep track of the # of mi's emitted. 1693 } 1694 1695 #include "ARMGenMCCodeEmitter.inc" 1696
