1 //===-- X86MCTargetDesc.cpp - X86 Target Descriptions ---------------------===// 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 provides X86 specific target descriptions. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "X86MCTargetDesc.h" 15 #include "InstPrinter/X86ATTInstPrinter.h" 16 #include "InstPrinter/X86IntelInstPrinter.h" 17 #include "X86MCAsmInfo.h" 18 #include "llvm/ADT/Triple.h" 19 #include "llvm/MC/MCCodeGenInfo.h" 20 #include "llvm/MC/MCInstrAnalysis.h" 21 #include "llvm/MC/MCInstrInfo.h" 22 #include "llvm/MC/MCRegisterInfo.h" 23 #include "llvm/MC/MCStreamer.h" 24 #include "llvm/MC/MCSubtargetInfo.h" 25 #include "llvm/MC/MachineLocation.h" 26 #include "llvm/Support/ErrorHandling.h" 27 #include "llvm/Support/Host.h" 28 #include "llvm/Support/TargetRegistry.h" 29 30 #define GET_REGINFO_MC_DESC 31 #include "X86GenRegisterInfo.inc" 32 33 #define GET_INSTRINFO_MC_DESC 34 #include "X86GenInstrInfo.inc" 35 36 #define GET_SUBTARGETINFO_MC_DESC 37 #include "X86GenSubtargetInfo.inc" 38 39 #if _MSC_VER 40 #include <intrin.h> 41 #endif 42 43 using namespace llvm; 44 45 46 std::string X86_MC::ParseX86Triple(StringRef TT) { 47 Triple TheTriple(TT); 48 std::string FS; 49 if (TheTriple.getArch() == Triple::x86_64) 50 FS = "+64bit-mode"; 51 else 52 FS = "-64bit-mode"; 53 return FS; 54 } 55 56 /// GetCpuIDAndInfo - Execute the specified cpuid and return the 4 values in the 57 /// specified arguments. If we can't run cpuid on the host, return true. 58 bool X86_MC::GetCpuIDAndInfo(unsigned value, unsigned *rEAX, 59 unsigned *rEBX, unsigned *rECX, unsigned *rEDX) { 60 #if defined(__x86_64__) || defined(_M_AMD64) || defined (_M_X64) 61 #if defined(__GNUC__) 62 // gcc doesn't know cpuid would clobber ebx/rbx. Preseve it manually. 63 asm ("movq\t%%rbx, %%rsi\n\t" 64 "cpuid\n\t" 65 "xchgq\t%%rbx, %%rsi\n\t" 66 : "=a" (*rEAX), 67 "=S" (*rEBX), 68 "=c" (*rECX), 69 "=d" (*rEDX) 70 : "a" (value)); 71 return false; 72 #elif defined(_MSC_VER) 73 int registers[4]; 74 __cpuid(registers, value); 75 *rEAX = registers[0]; 76 *rEBX = registers[1]; 77 *rECX = registers[2]; 78 *rEDX = registers[3]; 79 return false; 80 #else 81 return true; 82 #endif 83 #elif defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86) 84 #if defined(__GNUC__) 85 asm ("movl\t%%ebx, %%esi\n\t" 86 "cpuid\n\t" 87 "xchgl\t%%ebx, %%esi\n\t" 88 : "=a" (*rEAX), 89 "=S" (*rEBX), 90 "=c" (*rECX), 91 "=d" (*rEDX) 92 : "a" (value)); 93 return false; 94 #elif defined(_MSC_VER) 95 __asm { 96 mov eax,value 97 cpuid 98 mov esi,rEAX 99 mov dword ptr [esi],eax 100 mov esi,rEBX 101 mov dword ptr [esi],ebx 102 mov esi,rECX 103 mov dword ptr [esi],ecx 104 mov esi,rEDX 105 mov dword ptr [esi],edx 106 } 107 return false; 108 #else 109 return true; 110 #endif 111 #else 112 return true; 113 #endif 114 } 115 116 /// GetCpuIDAndInfoEx - Execute the specified cpuid with subleaf and return the 117 /// 4 values in the specified arguments. If we can't run cpuid on the host, 118 /// return true. 119 bool X86_MC::GetCpuIDAndInfoEx(unsigned value, unsigned subleaf, unsigned *rEAX, 120 unsigned *rEBX, unsigned *rECX, unsigned *rEDX) { 121 #if defined(__x86_64__) || defined(_M_AMD64) || defined (_M_X64) 122 #if defined(__GNUC__) 123 // gcc desn't know cpuid would clobber ebx/rbx. Preseve it manually. 124 asm ("movq\t%%rbx, %%rsi\n\t" 125 "cpuid\n\t" 126 "xchgq\t%%rbx, %%rsi\n\t" 127 : "=a" (*rEAX), 128 "=S" (*rEBX), 129 "=c" (*rECX), 130 "=d" (*rEDX) 131 : "a" (value), 132 "c" (subleaf)); 133 return false; 134 #elif defined(_MSC_VER) 135 // __cpuidex was added in MSVC++ 9.0 SP1 136 #if (_MSC_VER > 1500) || (_MSC_VER == 1500 && _MSC_FULL_VER >= 150030729) 137 int registers[4]; 138 __cpuidex(registers, value, subleaf); 139 *rEAX = registers[0]; 140 *rEBX = registers[1]; 141 *rECX = registers[2]; 142 *rEDX = registers[3]; 143 return false; 144 #else 145 return true; 146 #endif 147 #else 148 return true; 149 #endif 150 #elif defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86) 151 #if defined(__GNUC__) 152 asm ("movl\t%%ebx, %%esi\n\t" 153 "cpuid\n\t" 154 "xchgl\t%%ebx, %%esi\n\t" 155 : "=a" (*rEAX), 156 "=S" (*rEBX), 157 "=c" (*rECX), 158 "=d" (*rEDX) 159 : "a" (value), 160 "c" (subleaf)); 161 return false; 162 #elif defined(_MSC_VER) 163 __asm { 164 mov eax,value 165 mov ecx,subleaf 166 cpuid 167 mov esi,rEAX 168 mov dword ptr [esi],eax 169 mov esi,rEBX 170 mov dword ptr [esi],ebx 171 mov esi,rECX 172 mov dword ptr [esi],ecx 173 mov esi,rEDX 174 mov dword ptr [esi],edx 175 } 176 return false; 177 #else 178 return true; 179 #endif 180 #else 181 return true; 182 #endif 183 } 184 185 void X86_MC::DetectFamilyModel(unsigned EAX, unsigned &Family, 186 unsigned &Model) { 187 Family = (EAX >> 8) & 0xf; // Bits 8 - 11 188 Model = (EAX >> 4) & 0xf; // Bits 4 - 7 189 if (Family == 6 || Family == 0xf) { 190 if (Family == 0xf) 191 // Examine extended family ID if family ID is F. 192 Family += (EAX >> 20) & 0xff; // Bits 20 - 27 193 // Examine extended model ID if family ID is 6 or F. 194 Model += ((EAX >> 16) & 0xf) << 4; // Bits 16 - 19 195 } 196 } 197 198 unsigned X86_MC::getDwarfRegFlavour(StringRef TT, bool isEH) { 199 Triple TheTriple(TT); 200 if (TheTriple.getArch() == Triple::x86_64) 201 return DWARFFlavour::X86_64; 202 203 if (TheTriple.isOSDarwin()) 204 return isEH ? DWARFFlavour::X86_32_DarwinEH : DWARFFlavour::X86_32_Generic; 205 if (TheTriple.getOS() == Triple::MinGW32 || 206 TheTriple.getOS() == Triple::Cygwin) 207 // Unsupported by now, just quick fallback 208 return DWARFFlavour::X86_32_Generic; 209 return DWARFFlavour::X86_32_Generic; 210 } 211 212 void X86_MC::InitLLVM2SEHRegisterMapping(MCRegisterInfo *MRI) { 213 // FIXME: TableGen these. 214 for (unsigned Reg = X86::NoRegister+1; Reg < X86::NUM_TARGET_REGS; ++Reg) { 215 unsigned SEH = MRI->getEncodingValue(Reg); 216 MRI->mapLLVMRegToSEHReg(Reg, SEH); 217 } 218 } 219 220 MCSubtargetInfo *X86_MC::createX86MCSubtargetInfo(StringRef TT, StringRef CPU, 221 StringRef FS) { 222 std::string ArchFS = X86_MC::ParseX86Triple(TT); 223 if (!FS.empty()) { 224 if (!ArchFS.empty()) 225 ArchFS = ArchFS + "," + FS.str(); 226 else 227 ArchFS = FS; 228 } 229 230 std::string CPUName = CPU; 231 if (CPUName.empty()) { 232 #if defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)\ 233 || defined(__x86_64__) || defined(_M_AMD64) || defined (_M_X64) 234 CPUName = sys::getHostCPUName(); 235 #else 236 CPUName = "generic"; 237 #endif 238 } 239 240 MCSubtargetInfo *X = new MCSubtargetInfo(); 241 InitX86MCSubtargetInfo(X, TT, CPUName, ArchFS); 242 return X; 243 } 244 245 static MCInstrInfo *createX86MCInstrInfo() { 246 MCInstrInfo *X = new MCInstrInfo(); 247 InitX86MCInstrInfo(X); 248 return X; 249 } 250 251 static MCRegisterInfo *createX86MCRegisterInfo(StringRef TT) { 252 Triple TheTriple(TT); 253 unsigned RA = (TheTriple.getArch() == Triple::x86_64) 254 ? X86::RIP // Should have dwarf #16. 255 : X86::EIP; // Should have dwarf #8. 256 257 MCRegisterInfo *X = new MCRegisterInfo(); 258 InitX86MCRegisterInfo(X, RA, 259 X86_MC::getDwarfRegFlavour(TT, false), 260 X86_MC::getDwarfRegFlavour(TT, true), 261 RA); 262 X86_MC::InitLLVM2SEHRegisterMapping(X); 263 return X; 264 } 265 266 static MCAsmInfo *createX86MCAsmInfo(const MCRegisterInfo &MRI, StringRef TT) { 267 Triple TheTriple(TT); 268 bool is64Bit = TheTriple.getArch() == Triple::x86_64; 269 270 MCAsmInfo *MAI; 271 if (TheTriple.isOSDarwin() || TheTriple.getEnvironment() == Triple::MachO) { 272 if (is64Bit) 273 MAI = new X86_64MCAsmInfoDarwin(TheTriple); 274 else 275 MAI = new X86MCAsmInfoDarwin(TheTriple); 276 } else if (TheTriple.getEnvironment() == Triple::ELF) { 277 // Force the use of an ELF container. 278 MAI = new X86ELFMCAsmInfo(TheTriple); 279 } else if (TheTriple.getOS() == Triple::Win32) { 280 MAI = new X86MCAsmInfoMicrosoft(TheTriple); 281 } else if (TheTriple.getOS() == Triple::MinGW32 || TheTriple.getOS() == Triple::Cygwin) { 282 MAI = new X86MCAsmInfoGNUCOFF(TheTriple); 283 } else { 284 // The default is ELF. 285 MAI = new X86ELFMCAsmInfo(TheTriple); 286 } 287 288 // Initialize initial frame state. 289 // Calculate amount of bytes used for return address storing 290 int stackGrowth = is64Bit ? -8 : -4; 291 292 // Initial state of the frame pointer is esp+stackGrowth. 293 unsigned StackPtr = is64Bit ? X86::RSP : X86::ESP; 294 MCCFIInstruction Inst = MCCFIInstruction::createDefCfa( 295 0, MRI.getDwarfRegNum(StackPtr, true), -stackGrowth); 296 MAI->addInitialFrameState(Inst); 297 298 // Add return address to move list 299 unsigned InstPtr = is64Bit ? X86::RIP : X86::EIP; 300 MCCFIInstruction Inst2 = MCCFIInstruction::createOffset( 301 0, MRI.getDwarfRegNum(InstPtr, true), stackGrowth); 302 MAI->addInitialFrameState(Inst2); 303 304 return MAI; 305 } 306 307 static MCCodeGenInfo *createX86MCCodeGenInfo(StringRef TT, Reloc::Model RM, 308 CodeModel::Model CM, 309 CodeGenOpt::Level OL) { 310 MCCodeGenInfo *X = new MCCodeGenInfo(); 311 312 Triple T(TT); 313 bool is64Bit = T.getArch() == Triple::x86_64; 314 315 if (RM == Reloc::Default) { 316 // Darwin defaults to PIC in 64 bit mode and dynamic-no-pic in 32 bit mode. 317 // Win64 requires rip-rel addressing, thus we force it to PIC. Otherwise we 318 // use static relocation model by default. 319 if (T.isOSDarwin()) { 320 if (is64Bit) 321 RM = Reloc::PIC_; 322 else 323 RM = Reloc::DynamicNoPIC; 324 } else if (T.isOSWindows() && is64Bit) 325 RM = Reloc::PIC_; 326 else 327 RM = Reloc::Static; 328 } 329 330 // ELF and X86-64 don't have a distinct DynamicNoPIC model. DynamicNoPIC 331 // is defined as a model for code which may be used in static or dynamic 332 // executables but not necessarily a shared library. On X86-32 we just 333 // compile in -static mode, in x86-64 we use PIC. 334 if (RM == Reloc::DynamicNoPIC) { 335 if (is64Bit) 336 RM = Reloc::PIC_; 337 else if (!T.isOSDarwin()) 338 RM = Reloc::Static; 339 } 340 341 // If we are on Darwin, disallow static relocation model in X86-64 mode, since 342 // the Mach-O file format doesn't support it. 343 if (RM == Reloc::Static && T.isOSDarwin() && is64Bit) 344 RM = Reloc::PIC_; 345 346 // For static codegen, if we're not already set, use Small codegen. 347 if (CM == CodeModel::Default) 348 CM = CodeModel::Small; 349 else if (CM == CodeModel::JITDefault) 350 // 64-bit JIT places everything in the same buffer except external funcs. 351 CM = is64Bit ? CodeModel::Large : CodeModel::Small; 352 353 X->InitMCCodeGenInfo(RM, CM, OL); 354 return X; 355 } 356 357 static MCStreamer *createMCStreamer(const Target &T, StringRef TT, 358 MCContext &Ctx, MCAsmBackend &MAB, 359 raw_ostream &_OS, 360 MCCodeEmitter *_Emitter, 361 bool RelaxAll, 362 bool NoExecStack) { 363 Triple TheTriple(TT); 364 365 if (TheTriple.isOSDarwin() || TheTriple.getEnvironment() == Triple::MachO) 366 return createMachOStreamer(Ctx, MAB, _OS, _Emitter, RelaxAll); 367 368 if (TheTriple.isOSWindows() && TheTriple.getEnvironment() != Triple::ELF) 369 return createWinCOFFStreamer(Ctx, MAB, *_Emitter, _OS, RelaxAll); 370 371 return createELFStreamer(Ctx, MAB, _OS, _Emitter, RelaxAll, NoExecStack); 372 } 373 374 static MCInstPrinter *createX86MCInstPrinter(const Target &T, 375 unsigned SyntaxVariant, 376 const MCAsmInfo &MAI, 377 const MCInstrInfo &MII, 378 const MCRegisterInfo &MRI, 379 const MCSubtargetInfo &STI) { 380 if (SyntaxVariant == 0) 381 return new X86ATTInstPrinter(MAI, MII, MRI); 382 if (SyntaxVariant == 1) 383 return new X86IntelInstPrinter(MAI, MII, MRI); 384 return 0; 385 } 386 387 static MCRelocationInfo *createX86MCRelocationInfo(StringRef TT, 388 MCContext &Ctx) { 389 Triple TheTriple(TT); 390 if (TheTriple.isEnvironmentMachO() && TheTriple.getArch() == Triple::x86_64) 391 return createX86_64MachORelocationInfo(Ctx); 392 else if (TheTriple.isOSBinFormatELF()) 393 return createX86_64ELFRelocationInfo(Ctx); 394 // Default to the stock relocation info. 395 return llvm::createMCRelocationInfo(TT, Ctx); 396 } 397 398 static MCInstrAnalysis *createX86MCInstrAnalysis(const MCInstrInfo *Info) { 399 return new MCInstrAnalysis(Info); 400 } 401 402 // Force static initialization. 403 extern "C" void LLVMInitializeX86TargetMC() { 404 // Register the MC asm info. 405 RegisterMCAsmInfoFn A(TheX86_32Target, createX86MCAsmInfo); 406 RegisterMCAsmInfoFn B(TheX86_64Target, createX86MCAsmInfo); 407 408 // Register the MC codegen info. 409 RegisterMCCodeGenInfoFn C(TheX86_32Target, createX86MCCodeGenInfo); 410 RegisterMCCodeGenInfoFn D(TheX86_64Target, createX86MCCodeGenInfo); 411 412 // Register the MC instruction info. 413 TargetRegistry::RegisterMCInstrInfo(TheX86_32Target, createX86MCInstrInfo); 414 TargetRegistry::RegisterMCInstrInfo(TheX86_64Target, createX86MCInstrInfo); 415 416 // Register the MC register info. 417 TargetRegistry::RegisterMCRegInfo(TheX86_32Target, createX86MCRegisterInfo); 418 TargetRegistry::RegisterMCRegInfo(TheX86_64Target, createX86MCRegisterInfo); 419 420 // Register the MC subtarget info. 421 TargetRegistry::RegisterMCSubtargetInfo(TheX86_32Target, 422 X86_MC::createX86MCSubtargetInfo); 423 TargetRegistry::RegisterMCSubtargetInfo(TheX86_64Target, 424 X86_MC::createX86MCSubtargetInfo); 425 426 // Register the MC instruction analyzer. 427 TargetRegistry::RegisterMCInstrAnalysis(TheX86_32Target, 428 createX86MCInstrAnalysis); 429 TargetRegistry::RegisterMCInstrAnalysis(TheX86_64Target, 430 createX86MCInstrAnalysis); 431 432 // Register the code emitter. 433 TargetRegistry::RegisterMCCodeEmitter(TheX86_32Target, 434 createX86MCCodeEmitter); 435 TargetRegistry::RegisterMCCodeEmitter(TheX86_64Target, 436 createX86MCCodeEmitter); 437 438 // Register the asm backend. 439 TargetRegistry::RegisterMCAsmBackend(TheX86_32Target, 440 createX86_32AsmBackend); 441 TargetRegistry::RegisterMCAsmBackend(TheX86_64Target, 442 createX86_64AsmBackend); 443 444 // Register the object streamer. 445 TargetRegistry::RegisterMCObjectStreamer(TheX86_32Target, 446 createMCStreamer); 447 TargetRegistry::RegisterMCObjectStreamer(TheX86_64Target, 448 createMCStreamer); 449 450 // Register the MCInstPrinter. 451 TargetRegistry::RegisterMCInstPrinter(TheX86_32Target, 452 createX86MCInstPrinter); 453 TargetRegistry::RegisterMCInstPrinter(TheX86_64Target, 454 createX86MCInstPrinter); 455 456 // Register the MC relocation info. 457 TargetRegistry::RegisterMCRelocationInfo(TheX86_32Target, 458 createX86MCRelocationInfo); 459 TargetRegistry::RegisterMCRelocationInfo(TheX86_64Target, 460 createX86MCRelocationInfo); 461 } 462
