1 //===-- ARMMCTargetDesc.cpp - ARM Target Descriptions ---------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file provides ARM specific target descriptions. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "ARMMCTargetDesc.h" 14 #include "ARMBaseInfo.h" 15 #include "ARMInstPrinter.h" 16 #include "ARMMCAsmInfo.h" 17 #include "TargetInfo/ARMTargetInfo.h" 18 #include "llvm/ADT/Triple.h" 19 #include "llvm/MC/MCAsmBackend.h" 20 #include "llvm/MC/MCCodeEmitter.h" 21 #include "llvm/MC/MCELFStreamer.h" 22 #include "llvm/MC/MCInstrAnalysis.h" 23 #include "llvm/MC/MCInstrInfo.h" 24 #include "llvm/MC/MCObjectWriter.h" 25 #include "llvm/MC/MCRegisterInfo.h" 26 #include "llvm/MC/MCStreamer.h" 27 #include "llvm/MC/MCSubtargetInfo.h" 28 #include "llvm/Support/ErrorHandling.h" 29 #include "llvm/Support/TargetParser.h" 30 #include "llvm/Support/TargetRegistry.h" 31 32 using namespace llvm; 33 34 #define GET_REGINFO_MC_DESC 35 #include "ARMGenRegisterInfo.inc" 36 37 static bool getMCRDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI, 38 std::string &Info) { 39 if (STI.getFeatureBits()[llvm::ARM::HasV7Ops] && 40 (MI.getOperand(0).isImm() && MI.getOperand(0).getImm() == 15) && 41 (MI.getOperand(1).isImm() && MI.getOperand(1).getImm() == 0) && 42 // Checks for the deprecated CP15ISB encoding: 43 // mcr p15, #0, rX, c7, c5, #4 44 (MI.getOperand(3).isImm() && MI.getOperand(3).getImm() == 7)) { 45 if ((MI.getOperand(5).isImm() && MI.getOperand(5).getImm() == 4)) { 46 if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 5) { 47 Info = "deprecated since v7, use 'isb'"; 48 return true; 49 } 50 51 // Checks for the deprecated CP15DSB encoding: 52 // mcr p15, #0, rX, c7, c10, #4 53 if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 10) { 54 Info = "deprecated since v7, use 'dsb'"; 55 return true; 56 } 57 } 58 // Checks for the deprecated CP15DMB encoding: 59 // mcr p15, #0, rX, c7, c10, #5 60 if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 10 && 61 (MI.getOperand(5).isImm() && MI.getOperand(5).getImm() == 5)) { 62 Info = "deprecated since v7, use 'dmb'"; 63 return true; 64 } 65 } 66 return false; 67 } 68 69 static bool getITDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI, 70 std::string &Info) { 71 if (STI.getFeatureBits()[llvm::ARM::HasV8Ops] && MI.getOperand(1).isImm() && 72 MI.getOperand(1).getImm() != 8) { 73 Info = "applying IT instruction to more than one subsequent instruction is " 74 "deprecated"; 75 return true; 76 } 77 78 return false; 79 } 80 81 static bool getARMStoreDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI, 82 std::string &Info) { 83 assert(!STI.getFeatureBits()[llvm::ARM::ModeThumb] && 84 "cannot predicate thumb instructions"); 85 86 assert(MI.getNumOperands() >= 4 && "expected >= 4 arguments"); 87 for (unsigned OI = 4, OE = MI.getNumOperands(); OI < OE; ++OI) { 88 assert(MI.getOperand(OI).isReg() && "expected register"); 89 if (MI.getOperand(OI).getReg() == ARM::SP || 90 MI.getOperand(OI).getReg() == ARM::PC) { 91 Info = "use of SP or PC in the list is deprecated"; 92 return true; 93 } 94 } 95 return false; 96 } 97 98 static bool getARMLoadDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI, 99 std::string &Info) { 100 assert(!STI.getFeatureBits()[llvm::ARM::ModeThumb] && 101 "cannot predicate thumb instructions"); 102 103 assert(MI.getNumOperands() >= 4 && "expected >= 4 arguments"); 104 bool ListContainsPC = false, ListContainsLR = false; 105 for (unsigned OI = 4, OE = MI.getNumOperands(); OI < OE; ++OI) { 106 assert(MI.getOperand(OI).isReg() && "expected register"); 107 switch (MI.getOperand(OI).getReg()) { 108 default: 109 break; 110 case ARM::LR: 111 ListContainsLR = true; 112 break; 113 case ARM::PC: 114 ListContainsPC = true; 115 break; 116 case ARM::SP: 117 Info = "use of SP in the list is deprecated"; 118 return true; 119 } 120 } 121 122 if (ListContainsPC && ListContainsLR) { 123 Info = "use of LR and PC simultaneously in the list is deprecated"; 124 return true; 125 } 126 127 return false; 128 } 129 130 #define GET_INSTRINFO_MC_DESC 131 #include "ARMGenInstrInfo.inc" 132 133 #define GET_SUBTARGETINFO_MC_DESC 134 #include "ARMGenSubtargetInfo.inc" 135 136 std::string ARM_MC::ParseARMTriple(const Triple &TT, StringRef CPU) { 137 std::string ARMArchFeature; 138 139 ARM::ArchKind ArchID = ARM::parseArch(TT.getArchName()); 140 if (ArchID != ARM::ArchKind::INVALID && (CPU.empty() || CPU == "generic")) 141 ARMArchFeature = (ARMArchFeature + "+" + ARM::getArchName(ArchID)).str(); 142 143 if (TT.isThumb()) { 144 if (!ARMArchFeature.empty()) 145 ARMArchFeature += ","; 146 ARMArchFeature += "+thumb-mode,+v4t"; 147 } 148 149 if (TT.isOSNaCl()) { 150 if (!ARMArchFeature.empty()) 151 ARMArchFeature += ","; 152 ARMArchFeature += "+nacl-trap"; 153 } 154 155 if (TT.isOSWindows()) { 156 if (!ARMArchFeature.empty()) 157 ARMArchFeature += ","; 158 ARMArchFeature += "+noarm"; 159 } 160 161 return ARMArchFeature; 162 } 163 164 MCSubtargetInfo *ARM_MC::createARMMCSubtargetInfo(const Triple &TT, 165 StringRef CPU, StringRef FS) { 166 std::string ArchFS = ARM_MC::ParseARMTriple(TT, CPU); 167 if (!FS.empty()) { 168 if (!ArchFS.empty()) 169 ArchFS = (Twine(ArchFS) + "," + FS).str(); 170 else 171 ArchFS = FS; 172 } 173 174 return createARMMCSubtargetInfoImpl(TT, CPU, ArchFS); 175 } 176 177 static MCInstrInfo *createARMMCInstrInfo() { 178 MCInstrInfo *X = new MCInstrInfo(); 179 InitARMMCInstrInfo(X); 180 return X; 181 } 182 183 static MCRegisterInfo *createARMMCRegisterInfo(const Triple &Triple) { 184 MCRegisterInfo *X = new MCRegisterInfo(); 185 InitARMMCRegisterInfo(X, ARM::LR, 0, 0, ARM::PC); 186 return X; 187 } 188 189 static MCAsmInfo *createARMMCAsmInfo(const MCRegisterInfo &MRI, 190 const Triple &TheTriple, 191 const MCTargetOptions &Options) { 192 MCAsmInfo *MAI; 193 if (TheTriple.isOSDarwin() || TheTriple.isOSBinFormatMachO()) 194 MAI = new ARMMCAsmInfoDarwin(TheTriple); 195 else if (TheTriple.isWindowsMSVCEnvironment()) 196 MAI = new ARMCOFFMCAsmInfoMicrosoft(); 197 else if (TheTriple.isOSWindows()) 198 MAI = new ARMCOFFMCAsmInfoGNU(); 199 else 200 MAI = new ARMELFMCAsmInfo(TheTriple); 201 202 unsigned Reg = MRI.getDwarfRegNum(ARM::SP, true); 203 MAI->addInitialFrameState(MCCFIInstruction::createDefCfa(nullptr, Reg, 0)); 204 205 return MAI; 206 } 207 208 static MCStreamer *createELFStreamer(const Triple &T, MCContext &Ctx, 209 std::unique_ptr<MCAsmBackend> &&MAB, 210 std::unique_ptr<MCObjectWriter> &&OW, 211 std::unique_ptr<MCCodeEmitter> &&Emitter, 212 bool RelaxAll) { 213 return createARMELFStreamer( 214 Ctx, std::move(MAB), std::move(OW), std::move(Emitter), false, 215 (T.getArch() == Triple::thumb || T.getArch() == Triple::thumbeb)); 216 } 217 218 static MCStreamer * 219 createARMMachOStreamer(MCContext &Ctx, std::unique_ptr<MCAsmBackend> &&MAB, 220 std::unique_ptr<MCObjectWriter> &&OW, 221 std::unique_ptr<MCCodeEmitter> &&Emitter, bool RelaxAll, 222 bool DWARFMustBeAtTheEnd) { 223 return createMachOStreamer(Ctx, std::move(MAB), std::move(OW), 224 std::move(Emitter), false, DWARFMustBeAtTheEnd); 225 } 226 227 static MCInstPrinter *createARMMCInstPrinter(const Triple &T, 228 unsigned SyntaxVariant, 229 const MCAsmInfo &MAI, 230 const MCInstrInfo &MII, 231 const MCRegisterInfo &MRI) { 232 if (SyntaxVariant == 0) 233 return new ARMInstPrinter(MAI, MII, MRI); 234 return nullptr; 235 } 236 237 static MCRelocationInfo *createARMMCRelocationInfo(const Triple &TT, 238 MCContext &Ctx) { 239 if (TT.isOSBinFormatMachO()) 240 return createARMMachORelocationInfo(Ctx); 241 // Default to the stock relocation info. 242 return llvm::createMCRelocationInfo(TT, Ctx); 243 } 244 245 namespace { 246 247 class ARMMCInstrAnalysis : public MCInstrAnalysis { 248 public: 249 ARMMCInstrAnalysis(const MCInstrInfo *Info) : MCInstrAnalysis(Info) {} 250 251 bool isUnconditionalBranch(const MCInst &Inst) const override { 252 // BCCs with the "always" predicate are unconditional branches. 253 if (Inst.getOpcode() == ARM::Bcc && Inst.getOperand(1).getImm()==ARMCC::AL) 254 return true; 255 return MCInstrAnalysis::isUnconditionalBranch(Inst); 256 } 257 258 bool isConditionalBranch(const MCInst &Inst) const override { 259 // BCCs with the "always" predicate are unconditional branches. 260 if (Inst.getOpcode() == ARM::Bcc && Inst.getOperand(1).getImm()==ARMCC::AL) 261 return false; 262 return MCInstrAnalysis::isConditionalBranch(Inst); 263 } 264 265 bool evaluateBranch(const MCInst &Inst, uint64_t Addr, 266 uint64_t Size, uint64_t &Target) const override { 267 // We only handle PCRel branches for now. 268 if (Info->get(Inst.getOpcode()).OpInfo[0].OperandType!=MCOI::OPERAND_PCREL) 269 return false; 270 271 int64_t Imm = Inst.getOperand(0).getImm(); 272 Target = Addr+Imm+8; // In ARM mode the PC is always off by 8 bytes. 273 return true; 274 } 275 }; 276 277 class ThumbMCInstrAnalysis : public ARMMCInstrAnalysis { 278 public: 279 ThumbMCInstrAnalysis(const MCInstrInfo *Info) : ARMMCInstrAnalysis(Info) {} 280 281 bool evaluateBranch(const MCInst &Inst, uint64_t Addr, uint64_t Size, 282 uint64_t &Target) const override { 283 unsigned OpId; 284 switch (Inst.getOpcode()) { 285 default: 286 OpId = 0; 287 break; 288 case ARM::t2WLS: 289 case ARM::t2LEUpdate: 290 OpId = 2; 291 break; 292 case ARM::t2LE: 293 OpId = 1; 294 break; 295 } 296 297 // We only handle PCRel branches for now. 298 if (Info->get(Inst.getOpcode()).OpInfo[OpId].OperandType != 299 MCOI::OPERAND_PCREL) 300 return false; 301 302 // In Thumb mode the PC is always off by 4 bytes. 303 Target = Addr + Inst.getOperand(OpId).getImm() + 4; 304 return true; 305 } 306 }; 307 308 } 309 310 static MCInstrAnalysis *createARMMCInstrAnalysis(const MCInstrInfo *Info) { 311 return new ARMMCInstrAnalysis(Info); 312 } 313 314 static MCInstrAnalysis *createThumbMCInstrAnalysis(const MCInstrInfo *Info) { 315 return new ThumbMCInstrAnalysis(Info); 316 } 317 318 // Force static initialization. 319 extern "C" void LLVMInitializeARMTargetMC() { 320 for (Target *T : {&getTheARMLETarget(), &getTheARMBETarget(), 321 &getTheThumbLETarget(), &getTheThumbBETarget()}) { 322 // Register the MC asm info. 323 RegisterMCAsmInfoFn X(*T, createARMMCAsmInfo); 324 325 // Register the MC instruction info. 326 TargetRegistry::RegisterMCInstrInfo(*T, createARMMCInstrInfo); 327 328 // Register the MC register info. 329 TargetRegistry::RegisterMCRegInfo(*T, createARMMCRegisterInfo); 330 331 // Register the MC subtarget info. 332 TargetRegistry::RegisterMCSubtargetInfo(*T, 333 ARM_MC::createARMMCSubtargetInfo); 334 335 TargetRegistry::RegisterELFStreamer(*T, createELFStreamer); 336 TargetRegistry::RegisterCOFFStreamer(*T, createARMWinCOFFStreamer); 337 TargetRegistry::RegisterMachOStreamer(*T, createARMMachOStreamer); 338 339 // Register the obj target streamer. 340 TargetRegistry::RegisterObjectTargetStreamer(*T, 341 createARMObjectTargetStreamer); 342 343 // Register the asm streamer. 344 TargetRegistry::RegisterAsmTargetStreamer(*T, createARMTargetAsmStreamer); 345 346 // Register the null TargetStreamer. 347 TargetRegistry::RegisterNullTargetStreamer(*T, createARMNullTargetStreamer); 348 349 // Register the MCInstPrinter. 350 TargetRegistry::RegisterMCInstPrinter(*T, createARMMCInstPrinter); 351 352 // Register the MC relocation info. 353 TargetRegistry::RegisterMCRelocationInfo(*T, createARMMCRelocationInfo); 354 } 355 356 // Register the MC instruction analyzer. 357 for (Target *T : {&getTheARMLETarget(), &getTheARMBETarget()}) 358 TargetRegistry::RegisterMCInstrAnalysis(*T, createARMMCInstrAnalysis); 359 for (Target *T : {&getTheThumbLETarget(), &getTheThumbBETarget()}) 360 TargetRegistry::RegisterMCInstrAnalysis(*T, createThumbMCInstrAnalysis); 361 362 for (Target *T : {&getTheARMLETarget(), &getTheThumbLETarget()}) { 363 TargetRegistry::RegisterMCCodeEmitter(*T, createARMLEMCCodeEmitter); 364 TargetRegistry::RegisterMCAsmBackend(*T, createARMLEAsmBackend); 365 } 366 for (Target *T : {&getTheARMBETarget(), &getTheThumbBETarget()}) { 367 TargetRegistry::RegisterMCCodeEmitter(*T, createARMBEMCCodeEmitter); 368 TargetRegistry::RegisterMCAsmBackend(*T, createARMBEAsmBackend); 369 } 370 } 371