1//===-- X86Disassembler.cpp - Disassembler for x86 and x86_64 -------------===// 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 is part of the X86 Disassembler. 11// It contains code to translate the data produced by the decoder into 12// MCInsts. 13// Documentation for the disassembler can be found in X86Disassembler.h. 14// 15//===----------------------------------------------------------------------===// 16 17#include "X86Disassembler.h" 18#include "X86DisassemblerDecoder.h" 19#include "llvm/MC/MCContext.h" 20#include "llvm/MC/MCDisassembler.h" 21#include "llvm/MC/MCExpr.h" 22#include "llvm/MC/MCInst.h" 23#include "llvm/MC/MCInstrInfo.h" 24#include "llvm/MC/MCSubtargetInfo.h" 25#include "llvm/Support/Debug.h" 26#include "llvm/Support/MemoryObject.h" 27#include "llvm/Support/TargetRegistry.h" 28#include "llvm/Support/raw_ostream.h" 29 30#define GET_REGINFO_ENUM 31#include "X86GenRegisterInfo.inc" 32#define GET_INSTRINFO_ENUM 33#include "X86GenInstrInfo.inc" 34 35using namespace llvm; 36using namespace llvm::X86Disassembler; 37 38void x86DisassemblerDebug(const char *file, 39 unsigned line, 40 const char *s) { 41 dbgs() << file << ":" << line << ": " << s; 42} 43 44const char *x86DisassemblerGetInstrName(unsigned Opcode, const void *mii) { 45 const MCInstrInfo *MII = static_cast<const MCInstrInfo *>(mii); 46 return MII->getName(Opcode); 47} 48 49#define debug(s) DEBUG(x86DisassemblerDebug(__FILE__, __LINE__, s)); 50 51namespace llvm { 52 53// Fill-ins to make the compiler happy. These constants are never actually 54// assigned; they are just filler to make an automatically-generated switch 55// statement work. 56namespace X86 { 57 enum { 58 BX_SI = 500, 59 BX_DI = 501, 60 BP_SI = 502, 61 BP_DI = 503, 62 sib = 504, 63 sib64 = 505 64 }; 65} 66 67extern Target TheX86_32Target, TheX86_64Target; 68 69} 70 71static bool translateInstruction(MCInst &target, 72 InternalInstruction &source, 73 const MCDisassembler *Dis); 74 75X86GenericDisassembler::X86GenericDisassembler(const MCSubtargetInfo &STI, 76 DisassemblerMode mode, 77 const MCInstrInfo *MII) 78 : MCDisassembler(STI), MII(MII), fMode(mode) {} 79 80X86GenericDisassembler::~X86GenericDisassembler() { 81 delete MII; 82} 83 84/// regionReader - a callback function that wraps the readByte method from 85/// MemoryObject. 86/// 87/// @param arg - The generic callback parameter. In this case, this should 88/// be a pointer to a MemoryObject. 89/// @param byte - A pointer to the byte to be read. 90/// @param address - The address to be read. 91static int regionReader(const void* arg, uint8_t* byte, uint64_t address) { 92 const MemoryObject* region = static_cast<const MemoryObject*>(arg); 93 return region->readByte(address, byte); 94} 95 96/// logger - a callback function that wraps the operator<< method from 97/// raw_ostream. 98/// 99/// @param arg - The generic callback parameter. This should be a pointe 100/// to a raw_ostream. 101/// @param log - A string to be logged. logger() adds a newline. 102static void logger(void* arg, const char* log) { 103 if (!arg) 104 return; 105 106 raw_ostream &vStream = *(static_cast<raw_ostream*>(arg)); 107 vStream << log << "\n"; 108} 109 110// 111// Public interface for the disassembler 112// 113 114MCDisassembler::DecodeStatus 115X86GenericDisassembler::getInstruction(MCInst &instr, 116 uint64_t &size, 117 const MemoryObject ®ion, 118 uint64_t address, 119 raw_ostream &vStream, 120 raw_ostream &cStream) const { 121 CommentStream = &cStream; 122 123 InternalInstruction internalInstr; 124 125 dlog_t loggerFn = logger; 126 if (&vStream == &nulls()) 127 loggerFn = 0; // Disable logging completely if it's going to nulls(). 128 129 int ret = decodeInstruction(&internalInstr, 130 regionReader, 131 (const void*)®ion, 132 loggerFn, 133 (void*)&vStream, 134 (const void*)MII, 135 address, 136 fMode); 137 138 if (ret) { 139 size = internalInstr.readerCursor - address; 140 return Fail; 141 } 142 else { 143 size = internalInstr.length; 144 return (!translateInstruction(instr, internalInstr, this)) ? 145 Success : Fail; 146 } 147} 148 149// 150// Private code that translates from struct InternalInstructions to MCInsts. 151// 152 153/// translateRegister - Translates an internal register to the appropriate LLVM 154/// register, and appends it as an operand to an MCInst. 155/// 156/// @param mcInst - The MCInst to append to. 157/// @param reg - The Reg to append. 158static void translateRegister(MCInst &mcInst, Reg reg) { 159#define ENTRY(x) X86::x, 160 uint8_t llvmRegnums[] = { 161 ALL_REGS 162 0 163 }; 164#undef ENTRY 165 166 uint8_t llvmRegnum = llvmRegnums[reg]; 167 mcInst.addOperand(MCOperand::CreateReg(llvmRegnum)); 168} 169 170/// tryAddingSymbolicOperand - trys to add a symbolic operand in place of the 171/// immediate Value in the MCInst. 172/// 173/// @param Value - The immediate Value, has had any PC adjustment made by 174/// the caller. 175/// @param isBranch - If the instruction is a branch instruction 176/// @param Address - The starting address of the instruction 177/// @param Offset - The byte offset to this immediate in the instruction 178/// @param Width - The byte width of this immediate in the instruction 179/// 180/// If the getOpInfo() function was set when setupForSymbolicDisassembly() was 181/// called then that function is called to get any symbolic information for the 182/// immediate in the instruction using the Address, Offset and Width. If that 183/// returns non-zero then the symbolic information it returns is used to create 184/// an MCExpr and that is added as an operand to the MCInst. If getOpInfo() 185/// returns zero and isBranch is true then a symbol look up for immediate Value 186/// is done and if a symbol is found an MCExpr is created with that, else 187/// an MCExpr with the immediate Value is created. This function returns true 188/// if it adds an operand to the MCInst and false otherwise. 189static bool tryAddingSymbolicOperand(int64_t Value, bool isBranch, 190 uint64_t Address, uint64_t Offset, 191 uint64_t Width, MCInst &MI, 192 const MCDisassembler *Dis) { 193 return Dis->tryAddingSymbolicOperand(MI, Value, Address, isBranch, 194 Offset, Width); 195} 196 197/// tryAddingPcLoadReferenceComment - trys to add a comment as to what is being 198/// referenced by a load instruction with the base register that is the rip. 199/// These can often be addresses in a literal pool. The Address of the 200/// instruction and its immediate Value are used to determine the address 201/// being referenced in the literal pool entry. The SymbolLookUp call back will 202/// return a pointer to a literal 'C' string if the referenced address is an 203/// address into a section with 'C' string literals. 204static void tryAddingPcLoadReferenceComment(uint64_t Address, uint64_t Value, 205 const void *Decoder) { 206 const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder); 207 Dis->tryAddingPcLoadReferenceComment(Value, Address); 208} 209 210/// translateImmediate - Appends an immediate operand to an MCInst. 211/// 212/// @param mcInst - The MCInst to append to. 213/// @param immediate - The immediate value to append. 214/// @param operand - The operand, as stored in the descriptor table. 215/// @param insn - The internal instruction. 216static void translateImmediate(MCInst &mcInst, uint64_t immediate, 217 const OperandSpecifier &operand, 218 InternalInstruction &insn, 219 const MCDisassembler *Dis) { 220 // Sign-extend the immediate if necessary. 221 222 OperandType type = (OperandType)operand.type; 223 224 bool isBranch = false; 225 uint64_t pcrel = 0; 226 if (type == TYPE_RELv) { 227 isBranch = true; 228 pcrel = insn.startLocation + 229 insn.immediateOffset + insn.immediateSize; 230 switch (insn.displacementSize) { 231 default: 232 break; 233 case 1: 234 if(immediate & 0x80) 235 immediate |= ~(0xffull); 236 break; 237 case 2: 238 if(immediate & 0x8000) 239 immediate |= ~(0xffffull); 240 break; 241 case 4: 242 if(immediate & 0x80000000) 243 immediate |= ~(0xffffffffull); 244 break; 245 case 8: 246 break; 247 } 248 } 249 // By default sign-extend all X86 immediates based on their encoding. 250 else if (type == TYPE_IMM8 || type == TYPE_IMM16 || type == TYPE_IMM32 || 251 type == TYPE_IMM64) { 252 uint32_t Opcode = mcInst.getOpcode(); 253 switch (operand.encoding) { 254 default: 255 break; 256 case ENCODING_IB: 257 // Special case those X86 instructions that use the imm8 as a set of 258 // bits, bit count, etc. and are not sign-extend. 259 if (Opcode != X86::BLENDPSrri && Opcode != X86::BLENDPDrri && 260 Opcode != X86::PBLENDWrri && Opcode != X86::MPSADBWrri && 261 Opcode != X86::DPPSrri && Opcode != X86::DPPDrri && 262 Opcode != X86::INSERTPSrr && Opcode != X86::VBLENDPSYrri && 263 Opcode != X86::VBLENDPSYrmi && Opcode != X86::VBLENDPDYrri && 264 Opcode != X86::VBLENDPDYrmi && Opcode != X86::VPBLENDWrri && 265 Opcode != X86::VMPSADBWrri && Opcode != X86::VDPPSYrri && 266 Opcode != X86::VDPPSYrmi && Opcode != X86::VDPPDrri && 267 Opcode != X86::VINSERTPSrr) 268 if(immediate & 0x80) 269 immediate |= ~(0xffull); 270 break; 271 case ENCODING_IW: 272 if(immediate & 0x8000) 273 immediate |= ~(0xffffull); 274 break; 275 case ENCODING_ID: 276 if(immediate & 0x80000000) 277 immediate |= ~(0xffffffffull); 278 break; 279 case ENCODING_IO: 280 break; 281 } 282 } 283 284 switch (type) { 285 case TYPE_XMM32: 286 case TYPE_XMM64: 287 case TYPE_XMM128: 288 mcInst.addOperand(MCOperand::CreateReg(X86::XMM0 + (immediate >> 4))); 289 return; 290 case TYPE_XMM256: 291 mcInst.addOperand(MCOperand::CreateReg(X86::YMM0 + (immediate >> 4))); 292 return; 293 case TYPE_XMM512: 294 mcInst.addOperand(MCOperand::CreateReg(X86::ZMM0 + (immediate >> 4))); 295 return; 296 case TYPE_REL8: 297 isBranch = true; 298 pcrel = insn.startLocation + insn.immediateOffset + insn.immediateSize; 299 if(immediate & 0x80) 300 immediate |= ~(0xffull); 301 break; 302 case TYPE_REL32: 303 case TYPE_REL64: 304 isBranch = true; 305 pcrel = insn.startLocation + insn.immediateOffset + insn.immediateSize; 306 if(immediate & 0x80000000) 307 immediate |= ~(0xffffffffull); 308 break; 309 default: 310 // operand is 64 bits wide. Do nothing. 311 break; 312 } 313 314 if(!tryAddingSymbolicOperand(immediate + pcrel, isBranch, insn.startLocation, 315 insn.immediateOffset, insn.immediateSize, 316 mcInst, Dis)) 317 mcInst.addOperand(MCOperand::CreateImm(immediate)); 318} 319 320/// translateRMRegister - Translates a register stored in the R/M field of the 321/// ModR/M byte to its LLVM equivalent and appends it to an MCInst. 322/// @param mcInst - The MCInst to append to. 323/// @param insn - The internal instruction to extract the R/M field 324/// from. 325/// @return - 0 on success; -1 otherwise 326static bool translateRMRegister(MCInst &mcInst, 327 InternalInstruction &insn) { 328 if (insn.eaBase == EA_BASE_sib || insn.eaBase == EA_BASE_sib64) { 329 debug("A R/M register operand may not have a SIB byte"); 330 return true; 331 } 332 333 switch (insn.eaBase) { 334 default: 335 debug("Unexpected EA base register"); 336 return true; 337 case EA_BASE_NONE: 338 debug("EA_BASE_NONE for ModR/M base"); 339 return true; 340#define ENTRY(x) case EA_BASE_##x: 341 ALL_EA_BASES 342#undef ENTRY 343 debug("A R/M register operand may not have a base; " 344 "the operand must be a register."); 345 return true; 346#define ENTRY(x) \ 347 case EA_REG_##x: \ 348 mcInst.addOperand(MCOperand::CreateReg(X86::x)); break; 349 ALL_REGS 350#undef ENTRY 351 } 352 353 return false; 354} 355 356/// translateRMMemory - Translates a memory operand stored in the Mod and R/M 357/// fields of an internal instruction (and possibly its SIB byte) to a memory 358/// operand in LLVM's format, and appends it to an MCInst. 359/// 360/// @param mcInst - The MCInst to append to. 361/// @param insn - The instruction to extract Mod, R/M, and SIB fields 362/// from. 363/// @return - 0 on success; nonzero otherwise 364static bool translateRMMemory(MCInst &mcInst, InternalInstruction &insn, 365 const MCDisassembler *Dis) { 366 // Addresses in an MCInst are represented as five operands: 367 // 1. basereg (register) The R/M base, or (if there is a SIB) the 368 // SIB base 369 // 2. scaleamount (immediate) 1, or (if there is a SIB) the specified 370 // scale amount 371 // 3. indexreg (register) x86_registerNONE, or (if there is a SIB) 372 // the index (which is multiplied by the 373 // scale amount) 374 // 4. displacement (immediate) 0, or the displacement if there is one 375 // 5. segmentreg (register) x86_registerNONE for now, but could be set 376 // if we have segment overrides 377 378 MCOperand baseReg; 379 MCOperand scaleAmount; 380 MCOperand indexReg; 381 MCOperand displacement; 382 MCOperand segmentReg; 383 uint64_t pcrel = 0; 384 385 if (insn.eaBase == EA_BASE_sib || insn.eaBase == EA_BASE_sib64) { 386 if (insn.sibBase != SIB_BASE_NONE) { 387 switch (insn.sibBase) { 388 default: 389 debug("Unexpected sibBase"); 390 return true; 391#define ENTRY(x) \ 392 case SIB_BASE_##x: \ 393 baseReg = MCOperand::CreateReg(X86::x); break; 394 ALL_SIB_BASES 395#undef ENTRY 396 } 397 } else { 398 baseReg = MCOperand::CreateReg(0); 399 } 400 401 // Check whether we are handling VSIB addressing mode for GATHER. 402 // If sibIndex was set to SIB_INDEX_NONE, index offset is 4 and 403 // we should use SIB_INDEX_XMM4|YMM4 for VSIB. 404 // I don't see a way to get the correct IndexReg in readSIB: 405 // We can tell whether it is VSIB or SIB after instruction ID is decoded, 406 // but instruction ID may not be decoded yet when calling readSIB. 407 uint32_t Opcode = mcInst.getOpcode(); 408 bool IndexIs128 = (Opcode == X86::VGATHERDPDrm || 409 Opcode == X86::VGATHERDPDYrm || 410 Opcode == X86::VGATHERQPDrm || 411 Opcode == X86::VGATHERDPSrm || 412 Opcode == X86::VGATHERQPSrm || 413 Opcode == X86::VPGATHERDQrm || 414 Opcode == X86::VPGATHERDQYrm || 415 Opcode == X86::VPGATHERQQrm || 416 Opcode == X86::VPGATHERDDrm || 417 Opcode == X86::VPGATHERQDrm); 418 bool IndexIs256 = (Opcode == X86::VGATHERQPDYrm || 419 Opcode == X86::VGATHERDPSYrm || 420 Opcode == X86::VGATHERQPSYrm || 421 Opcode == X86::VPGATHERQQYrm || 422 Opcode == X86::VPGATHERDDYrm || 423 Opcode == X86::VPGATHERQDYrm); 424 if (IndexIs128 || IndexIs256) { 425 unsigned IndexOffset = insn.sibIndex - 426 (insn.addressSize == 8 ? SIB_INDEX_RAX:SIB_INDEX_EAX); 427 SIBIndex IndexBase = IndexIs256 ? SIB_INDEX_YMM0 : SIB_INDEX_XMM0; 428 insn.sibIndex = (SIBIndex)(IndexBase + 429 (insn.sibIndex == SIB_INDEX_NONE ? 4 : IndexOffset)); 430 } 431 432 if (insn.sibIndex != SIB_INDEX_NONE) { 433 switch (insn.sibIndex) { 434 default: 435 debug("Unexpected sibIndex"); 436 return true; 437#define ENTRY(x) \ 438 case SIB_INDEX_##x: \ 439 indexReg = MCOperand::CreateReg(X86::x); break; 440 EA_BASES_32BIT 441 EA_BASES_64BIT 442 REGS_XMM 443 REGS_YMM 444 REGS_ZMM 445#undef ENTRY 446 } 447 } else { 448 indexReg = MCOperand::CreateReg(0); 449 } 450 451 scaleAmount = MCOperand::CreateImm(insn.sibScale); 452 } else { 453 switch (insn.eaBase) { 454 case EA_BASE_NONE: 455 if (insn.eaDisplacement == EA_DISP_NONE) { 456 debug("EA_BASE_NONE and EA_DISP_NONE for ModR/M base"); 457 return true; 458 } 459 if (insn.mode == MODE_64BIT){ 460 pcrel = insn.startLocation + 461 insn.displacementOffset + insn.displacementSize; 462 tryAddingPcLoadReferenceComment(insn.startLocation + 463 insn.displacementOffset, 464 insn.displacement + pcrel, Dis); 465 baseReg = MCOperand::CreateReg(X86::RIP); // Section 2.2.1.6 466 } 467 else 468 baseReg = MCOperand::CreateReg(0); 469 470 indexReg = MCOperand::CreateReg(0); 471 break; 472 case EA_BASE_BX_SI: 473 baseReg = MCOperand::CreateReg(X86::BX); 474 indexReg = MCOperand::CreateReg(X86::SI); 475 break; 476 case EA_BASE_BX_DI: 477 baseReg = MCOperand::CreateReg(X86::BX); 478 indexReg = MCOperand::CreateReg(X86::DI); 479 break; 480 case EA_BASE_BP_SI: 481 baseReg = MCOperand::CreateReg(X86::BP); 482 indexReg = MCOperand::CreateReg(X86::SI); 483 break; 484 case EA_BASE_BP_DI: 485 baseReg = MCOperand::CreateReg(X86::BP); 486 indexReg = MCOperand::CreateReg(X86::DI); 487 break; 488 default: 489 indexReg = MCOperand::CreateReg(0); 490 switch (insn.eaBase) { 491 default: 492 debug("Unexpected eaBase"); 493 return true; 494 // Here, we will use the fill-ins defined above. However, 495 // BX_SI, BX_DI, BP_SI, and BP_DI are all handled above and 496 // sib and sib64 were handled in the top-level if, so they're only 497 // placeholders to keep the compiler happy. 498#define ENTRY(x) \ 499 case EA_BASE_##x: \ 500 baseReg = MCOperand::CreateReg(X86::x); break; 501 ALL_EA_BASES 502#undef ENTRY 503#define ENTRY(x) case EA_REG_##x: 504 ALL_REGS 505#undef ENTRY 506 debug("A R/M memory operand may not be a register; " 507 "the base field must be a base."); 508 return true; 509 } 510 } 511 512 scaleAmount = MCOperand::CreateImm(1); 513 } 514 515 displacement = MCOperand::CreateImm(insn.displacement); 516 517 static const uint8_t segmentRegnums[SEG_OVERRIDE_max] = { 518 0, // SEG_OVERRIDE_NONE 519 X86::CS, 520 X86::SS, 521 X86::DS, 522 X86::ES, 523 X86::FS, 524 X86::GS 525 }; 526 527 segmentReg = MCOperand::CreateReg(segmentRegnums[insn.segmentOverride]); 528 529 mcInst.addOperand(baseReg); 530 mcInst.addOperand(scaleAmount); 531 mcInst.addOperand(indexReg); 532 if(!tryAddingSymbolicOperand(insn.displacement + pcrel, false, 533 insn.startLocation, insn.displacementOffset, 534 insn.displacementSize, mcInst, Dis)) 535 mcInst.addOperand(displacement); 536 mcInst.addOperand(segmentReg); 537 return false; 538} 539 540/// translateRM - Translates an operand stored in the R/M (and possibly SIB) 541/// byte of an instruction to LLVM form, and appends it to an MCInst. 542/// 543/// @param mcInst - The MCInst to append to. 544/// @param operand - The operand, as stored in the descriptor table. 545/// @param insn - The instruction to extract Mod, R/M, and SIB fields 546/// from. 547/// @return - 0 on success; nonzero otherwise 548static bool translateRM(MCInst &mcInst, const OperandSpecifier &operand, 549 InternalInstruction &insn, const MCDisassembler *Dis) { 550 switch (operand.type) { 551 default: 552 debug("Unexpected type for a R/M operand"); 553 return true; 554 case TYPE_R8: 555 case TYPE_R16: 556 case TYPE_R32: 557 case TYPE_R64: 558 case TYPE_Rv: 559 case TYPE_MM: 560 case TYPE_MM32: 561 case TYPE_MM64: 562 case TYPE_XMM: 563 case TYPE_XMM32: 564 case TYPE_XMM64: 565 case TYPE_XMM128: 566 case TYPE_XMM256: 567 case TYPE_XMM512: 568 case TYPE_DEBUGREG: 569 case TYPE_CONTROLREG: 570 return translateRMRegister(mcInst, insn); 571 case TYPE_M: 572 case TYPE_M8: 573 case TYPE_M16: 574 case TYPE_M32: 575 case TYPE_M64: 576 case TYPE_M128: 577 case TYPE_M256: 578 case TYPE_M512: 579 case TYPE_Mv: 580 case TYPE_M32FP: 581 case TYPE_M64FP: 582 case TYPE_M80FP: 583 case TYPE_M16INT: 584 case TYPE_M32INT: 585 case TYPE_M64INT: 586 case TYPE_M1616: 587 case TYPE_M1632: 588 case TYPE_M1664: 589 case TYPE_LEA: 590 return translateRMMemory(mcInst, insn, Dis); 591 } 592} 593 594/// translateFPRegister - Translates a stack position on the FPU stack to its 595/// LLVM form, and appends it to an MCInst. 596/// 597/// @param mcInst - The MCInst to append to. 598/// @param stackPos - The stack position to translate. 599/// @return - 0 on success; nonzero otherwise. 600static bool translateFPRegister(MCInst &mcInst, 601 uint8_t stackPos) { 602 if (stackPos >= 8) { 603 debug("Invalid FP stack position"); 604 return true; 605 } 606 607 mcInst.addOperand(MCOperand::CreateReg(X86::ST0 + stackPos)); 608 609 return false; 610} 611 612/// translateOperand - Translates an operand stored in an internal instruction 613/// to LLVM's format and appends it to an MCInst. 614/// 615/// @param mcInst - The MCInst to append to. 616/// @param operand - The operand, as stored in the descriptor table. 617/// @param insn - The internal instruction. 618/// @return - false on success; true otherwise. 619static bool translateOperand(MCInst &mcInst, const OperandSpecifier &operand, 620 InternalInstruction &insn, 621 const MCDisassembler *Dis) { 622 switch (operand.encoding) { 623 default: 624 debug("Unhandled operand encoding during translation"); 625 return true; 626 case ENCODING_REG: 627 translateRegister(mcInst, insn.reg); 628 return false; 629 case ENCODING_RM: 630 return translateRM(mcInst, operand, insn, Dis); 631 case ENCODING_CB: 632 case ENCODING_CW: 633 case ENCODING_CD: 634 case ENCODING_CP: 635 case ENCODING_CO: 636 case ENCODING_CT: 637 debug("Translation of code offsets isn't supported."); 638 return true; 639 case ENCODING_IB: 640 case ENCODING_IW: 641 case ENCODING_ID: 642 case ENCODING_IO: 643 case ENCODING_Iv: 644 case ENCODING_Ia: 645 translateImmediate(mcInst, 646 insn.immediates[insn.numImmediatesTranslated++], 647 operand, 648 insn, 649 Dis); 650 return false; 651 case ENCODING_RB: 652 case ENCODING_RW: 653 case ENCODING_RD: 654 case ENCODING_RO: 655 translateRegister(mcInst, insn.opcodeRegister); 656 return false; 657 case ENCODING_I: 658 return translateFPRegister(mcInst, insn.opcodeModifier); 659 case ENCODING_Rv: 660 translateRegister(mcInst, insn.opcodeRegister); 661 return false; 662 case ENCODING_VVVV: 663 translateRegister(mcInst, insn.vvvv); 664 return false; 665 case ENCODING_DUP: 666 return translateOperand(mcInst, insn.operands[operand.type - TYPE_DUP0], 667 insn, Dis); 668 } 669} 670 671/// translateInstruction - Translates an internal instruction and all its 672/// operands to an MCInst. 673/// 674/// @param mcInst - The MCInst to populate with the instruction's data. 675/// @param insn - The internal instruction. 676/// @return - false on success; true otherwise. 677static bool translateInstruction(MCInst &mcInst, 678 InternalInstruction &insn, 679 const MCDisassembler *Dis) { 680 if (!insn.spec) { 681 debug("Instruction has no specification"); 682 return true; 683 } 684 685 mcInst.setOpcode(insn.instructionID); 686 // If when reading the prefix bytes we determined the overlapping 0xf2 or 0xf3 687 // prefix bytes should be disassembled as xrelease and xacquire then set the 688 // opcode to those instead of the rep and repne opcodes. 689 if (insn.xAcquireRelease) { 690 if(mcInst.getOpcode() == X86::REP_PREFIX) 691 mcInst.setOpcode(X86::XRELEASE_PREFIX); 692 else if(mcInst.getOpcode() == X86::REPNE_PREFIX) 693 mcInst.setOpcode(X86::XACQUIRE_PREFIX); 694 } 695 696 int index; 697 698 insn.numImmediatesTranslated = 0; 699 700 for (index = 0; index < X86_MAX_OPERANDS; ++index) { 701 if (insn.operands[index].encoding != ENCODING_NONE) { 702 if (translateOperand(mcInst, insn.operands[index], insn, Dis)) { 703 return true; 704 } 705 } 706 } 707 708 return false; 709} 710 711static MCDisassembler *createX86_32Disassembler(const Target &T, 712 const MCSubtargetInfo &STI) { 713 return new X86Disassembler::X86GenericDisassembler(STI, MODE_32BIT, 714 T.createMCInstrInfo()); 715} 716 717static MCDisassembler *createX86_64Disassembler(const Target &T, 718 const MCSubtargetInfo &STI) { 719 return new X86Disassembler::X86GenericDisassembler(STI, MODE_64BIT, 720 T.createMCInstrInfo()); 721} 722 723extern "C" void LLVMInitializeX86Disassembler() { 724 // Register the disassembler. 725 TargetRegistry::RegisterMCDisassembler(TheX86_32Target, 726 createX86_32Disassembler); 727 TargetRegistry::RegisterMCDisassembler(TheX86_64Target, 728 createX86_64Disassembler); 729} 730