1 //===-- PPCMCTargetDesc.cpp - PowerPC 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 PowerPC specific target descriptions. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "PPCMCTargetDesc.h" 15 #include "InstPrinter/PPCInstPrinter.h" 16 #include "PPCMCAsmInfo.h" 17 #include "PPCTargetStreamer.h" 18 #include "llvm/MC/MCCodeGenInfo.h" 19 #include "llvm/MC/MCELF.h" 20 #include "llvm/MC/MCELFStreamer.h" 21 #include "llvm/MC/MCExpr.h" 22 #include "llvm/MC/MCInstrInfo.h" 23 #include "llvm/MC/MCRegisterInfo.h" 24 #include "llvm/MC/MCStreamer.h" 25 #include "llvm/MC/MCSubtargetInfo.h" 26 #include "llvm/MC/MCSymbol.h" 27 #include "llvm/MC/MachineLocation.h" 28 #include "llvm/Support/ELF.h" 29 #include "llvm/Support/ErrorHandling.h" 30 #include "llvm/Support/FormattedStream.h" 31 #include "llvm/Support/TargetRegistry.h" 32 33 using namespace llvm; 34 35 #define GET_INSTRINFO_MC_DESC 36 #include "PPCGenInstrInfo.inc" 37 38 #define GET_SUBTARGETINFO_MC_DESC 39 #include "PPCGenSubtargetInfo.inc" 40 41 #define GET_REGINFO_MC_DESC 42 #include "PPCGenRegisterInfo.inc" 43 44 // Pin the vtable to this file. 45 PPCTargetStreamer::~PPCTargetStreamer() {} 46 PPCTargetStreamer::PPCTargetStreamer(MCStreamer &S) : MCTargetStreamer(S) {} 47 48 static MCInstrInfo *createPPCMCInstrInfo() { 49 MCInstrInfo *X = new MCInstrInfo(); 50 InitPPCMCInstrInfo(X); 51 return X; 52 } 53 54 static MCRegisterInfo *createPPCMCRegisterInfo(StringRef TT) { 55 Triple TheTriple(TT); 56 bool isPPC64 = (TheTriple.getArch() == Triple::ppc64 || 57 TheTriple.getArch() == Triple::ppc64le); 58 unsigned Flavour = isPPC64 ? 0 : 1; 59 unsigned RA = isPPC64 ? PPC::LR8 : PPC::LR; 60 61 MCRegisterInfo *X = new MCRegisterInfo(); 62 InitPPCMCRegisterInfo(X, RA, Flavour, Flavour); 63 return X; 64 } 65 66 static MCSubtargetInfo *createPPCMCSubtargetInfo(StringRef TT, StringRef CPU, 67 StringRef FS) { 68 MCSubtargetInfo *X = new MCSubtargetInfo(); 69 InitPPCMCSubtargetInfo(X, TT, CPU, FS); 70 return X; 71 } 72 73 static MCAsmInfo *createPPCMCAsmInfo(const MCRegisterInfo &MRI, StringRef TT) { 74 Triple TheTriple(TT); 75 bool isPPC64 = (TheTriple.getArch() == Triple::ppc64 || 76 TheTriple.getArch() == Triple::ppc64le); 77 78 MCAsmInfo *MAI; 79 if (TheTriple.isOSDarwin()) 80 MAI = new PPCMCAsmInfoDarwin(isPPC64, TheTriple); 81 else 82 MAI = new PPCLinuxMCAsmInfo(isPPC64, TheTriple); 83 84 // Initial state of the frame pointer is R1. 85 unsigned Reg = isPPC64 ? PPC::X1 : PPC::R1; 86 MCCFIInstruction Inst = 87 MCCFIInstruction::createDefCfa(nullptr, MRI.getDwarfRegNum(Reg, true), 0); 88 MAI->addInitialFrameState(Inst); 89 90 return MAI; 91 } 92 93 static MCCodeGenInfo *createPPCMCCodeGenInfo(StringRef TT, Reloc::Model RM, 94 CodeModel::Model CM, 95 CodeGenOpt::Level OL) { 96 MCCodeGenInfo *X = new MCCodeGenInfo(); 97 98 if (RM == Reloc::Default) { 99 Triple T(TT); 100 if (T.isOSDarwin()) 101 RM = Reloc::DynamicNoPIC; 102 else 103 RM = Reloc::Static; 104 } 105 if (CM == CodeModel::Default) { 106 Triple T(TT); 107 if (!T.isOSDarwin() && 108 (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le)) 109 CM = CodeModel::Medium; 110 } 111 X->InitMCCodeGenInfo(RM, CM, OL); 112 return X; 113 } 114 115 namespace { 116 class PPCTargetAsmStreamer : public PPCTargetStreamer { 117 formatted_raw_ostream &OS; 118 119 public: 120 PPCTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS) 121 : PPCTargetStreamer(S), OS(OS) {} 122 void emitTCEntry(const MCSymbol &S) override { 123 OS << "\t.tc "; 124 OS << S.getName(); 125 OS << "[TC],"; 126 OS << S.getName(); 127 OS << '\n'; 128 } 129 void emitMachine(StringRef CPU) override { 130 OS << "\t.machine " << CPU << '\n'; 131 } 132 virtual void emitAbiVersion(int AbiVersion) override { 133 OS << "\t.abiversion " << AbiVersion << '\n'; 134 } 135 virtual void emitLocalEntry(MCSymbol *S, const MCExpr *LocalOffset) { 136 OS << "\t.localentry\t" << *S << ", " << *LocalOffset << '\n'; 137 } 138 }; 139 140 class PPCTargetELFStreamer : public PPCTargetStreamer { 141 public: 142 PPCTargetELFStreamer(MCStreamer &S) : PPCTargetStreamer(S) {} 143 MCELFStreamer &getStreamer() { 144 return static_cast<MCELFStreamer &>(Streamer); 145 } 146 virtual void emitTCEntry(const MCSymbol &S) override { 147 // Creates a R_PPC64_TOC relocation 148 Streamer.EmitSymbolValue(&S, 8); 149 } 150 void emitMachine(StringRef CPU) override { 151 // FIXME: Is there anything to do in here or does this directive only 152 // limit the parser? 153 } 154 virtual void emitAbiVersion(int AbiVersion) override { 155 MCAssembler &MCA = getStreamer().getAssembler(); 156 unsigned Flags = MCA.getELFHeaderEFlags(); 157 Flags &= ~ELF::EF_PPC64_ABI; 158 Flags |= (AbiVersion & ELF::EF_PPC64_ABI); 159 MCA.setELFHeaderEFlags(Flags); 160 } 161 virtual void emitLocalEntry(MCSymbol *S, const MCExpr *LocalOffset) { 162 MCAssembler &MCA = getStreamer().getAssembler(); 163 MCSymbolData &Data = getStreamer().getOrCreateSymbolData(S); 164 165 int64_t Res; 166 if (!LocalOffset->EvaluateAsAbsolute(Res, MCA)) 167 report_fatal_error(".localentry expression must be absolute."); 168 169 unsigned Encoded = ELF::encodePPC64LocalEntryOffset(Res); 170 if (Res != ELF::decodePPC64LocalEntryOffset(Encoded)) 171 report_fatal_error(".localentry expression cannot be encoded."); 172 173 // The "other" values are stored in the last 6 bits of the second byte. 174 // The traditional defines for STO values assume the full byte and thus 175 // the shift to pack it. 176 unsigned Other = MCELF::getOther(Data) << 2; 177 Other &= ~ELF::STO_PPC64_LOCAL_MASK; 178 Other |= Encoded; 179 MCELF::setOther(Data, Other >> 2); 180 181 // For GAS compatibility, unless we already saw a .abiversion directive, 182 // set e_flags to indicate ELFv2 ABI. 183 unsigned Flags = MCA.getELFHeaderEFlags(); 184 if ((Flags & ELF::EF_PPC64_ABI) == 0) 185 MCA.setELFHeaderEFlags(Flags | 2); 186 } 187 void emitAssignment(MCSymbol *Symbol, const MCExpr *Value) override { 188 // When encoding an assignment to set symbol A to symbol B, also copy 189 // the st_other bits encoding the local entry point offset. 190 if (Value->getKind() != MCExpr::SymbolRef) 191 return; 192 const MCSymbol &RhsSym = 193 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol(); 194 MCSymbolData &Data = getStreamer().getOrCreateSymbolData(&RhsSym); 195 MCSymbolData &SymbolData = getStreamer().getOrCreateSymbolData(Symbol); 196 // The "other" values are stored in the last 6 bits of the second byte. 197 // The traditional defines for STO values assume the full byte and thus 198 // the shift to pack it. 199 unsigned Other = MCELF::getOther(SymbolData) << 2; 200 Other &= ~ELF::STO_PPC64_LOCAL_MASK; 201 Other |= (MCELF::getOther(Data) << 2) & ELF::STO_PPC64_LOCAL_MASK; 202 MCELF::setOther(SymbolData, Other >> 2); 203 } 204 }; 205 206 class PPCTargetMachOStreamer : public PPCTargetStreamer { 207 public: 208 PPCTargetMachOStreamer(MCStreamer &S) : PPCTargetStreamer(S) {} 209 void emitTCEntry(const MCSymbol &S) override { 210 llvm_unreachable("Unknown pseudo-op: .tc"); 211 } 212 void emitMachine(StringRef CPU) override { 213 // FIXME: We should update the CPUType, CPUSubType in the Object file if 214 // the new values are different from the defaults. 215 } 216 virtual void emitAbiVersion(int AbiVersion) override { 217 llvm_unreachable("Unknown pseudo-op: .abiversion"); 218 } 219 virtual void emitLocalEntry(MCSymbol *S, const MCExpr *LocalOffset) { 220 llvm_unreachable("Unknown pseudo-op: .localentry"); 221 } 222 }; 223 } 224 225 // This is duplicated code. Refactor this. 226 static MCStreamer *createMCStreamer(const Target &T, StringRef TT, 227 MCContext &Ctx, MCAsmBackend &MAB, 228 raw_ostream &OS, 229 MCCodeEmitter *Emitter, 230 const MCSubtargetInfo &STI, 231 bool RelaxAll, 232 bool NoExecStack) { 233 if (Triple(TT).isOSDarwin()) { 234 MCStreamer *S = createMachOStreamer(Ctx, MAB, OS, Emitter, RelaxAll); 235 new PPCTargetMachOStreamer(*S); 236 return S; 237 } 238 239 MCStreamer *S = 240 createELFStreamer(Ctx, MAB, OS, Emitter, RelaxAll, NoExecStack); 241 new PPCTargetELFStreamer(*S); 242 return S; 243 } 244 245 static MCStreamer * 246 createMCAsmStreamer(MCContext &Ctx, formatted_raw_ostream &OS, 247 bool isVerboseAsm, bool useDwarfDirectory, 248 MCInstPrinter *InstPrint, MCCodeEmitter *CE, 249 MCAsmBackend *TAB, bool ShowInst) { 250 251 MCStreamer *S = llvm::createAsmStreamer( 252 Ctx, OS, isVerboseAsm, useDwarfDirectory, InstPrint, CE, TAB, ShowInst); 253 new PPCTargetAsmStreamer(*S, OS); 254 return S; 255 } 256 257 static MCInstPrinter *createPPCMCInstPrinter(const Target &T, 258 unsigned SyntaxVariant, 259 const MCAsmInfo &MAI, 260 const MCInstrInfo &MII, 261 const MCRegisterInfo &MRI, 262 const MCSubtargetInfo &STI) { 263 bool isDarwin = Triple(STI.getTargetTriple()).isOSDarwin(); 264 return new PPCInstPrinter(MAI, MII, MRI, isDarwin); 265 } 266 267 extern "C" void LLVMInitializePowerPCTargetMC() { 268 // Register the MC asm info. 269 RegisterMCAsmInfoFn C(ThePPC32Target, createPPCMCAsmInfo); 270 RegisterMCAsmInfoFn D(ThePPC64Target, createPPCMCAsmInfo); 271 RegisterMCAsmInfoFn E(ThePPC64LETarget, createPPCMCAsmInfo); 272 273 // Register the MC codegen info. 274 TargetRegistry::RegisterMCCodeGenInfo(ThePPC32Target, createPPCMCCodeGenInfo); 275 TargetRegistry::RegisterMCCodeGenInfo(ThePPC64Target, createPPCMCCodeGenInfo); 276 TargetRegistry::RegisterMCCodeGenInfo(ThePPC64LETarget, 277 createPPCMCCodeGenInfo); 278 279 // Register the MC instruction info. 280 TargetRegistry::RegisterMCInstrInfo(ThePPC32Target, createPPCMCInstrInfo); 281 TargetRegistry::RegisterMCInstrInfo(ThePPC64Target, createPPCMCInstrInfo); 282 TargetRegistry::RegisterMCInstrInfo(ThePPC64LETarget, 283 createPPCMCInstrInfo); 284 285 // Register the MC register info. 286 TargetRegistry::RegisterMCRegInfo(ThePPC32Target, createPPCMCRegisterInfo); 287 TargetRegistry::RegisterMCRegInfo(ThePPC64Target, createPPCMCRegisterInfo); 288 TargetRegistry::RegisterMCRegInfo(ThePPC64LETarget, createPPCMCRegisterInfo); 289 290 // Register the MC subtarget info. 291 TargetRegistry::RegisterMCSubtargetInfo(ThePPC32Target, 292 createPPCMCSubtargetInfo); 293 TargetRegistry::RegisterMCSubtargetInfo(ThePPC64Target, 294 createPPCMCSubtargetInfo); 295 TargetRegistry::RegisterMCSubtargetInfo(ThePPC64LETarget, 296 createPPCMCSubtargetInfo); 297 298 // Register the MC Code Emitter 299 TargetRegistry::RegisterMCCodeEmitter(ThePPC32Target, createPPCMCCodeEmitter); 300 TargetRegistry::RegisterMCCodeEmitter(ThePPC64Target, createPPCMCCodeEmitter); 301 TargetRegistry::RegisterMCCodeEmitter(ThePPC64LETarget, 302 createPPCMCCodeEmitter); 303 304 // Register the asm backend. 305 TargetRegistry::RegisterMCAsmBackend(ThePPC32Target, createPPCAsmBackend); 306 TargetRegistry::RegisterMCAsmBackend(ThePPC64Target, createPPCAsmBackend); 307 TargetRegistry::RegisterMCAsmBackend(ThePPC64LETarget, createPPCAsmBackend); 308 309 // Register the object streamer. 310 TargetRegistry::RegisterMCObjectStreamer(ThePPC32Target, createMCStreamer); 311 TargetRegistry::RegisterMCObjectStreamer(ThePPC64Target, createMCStreamer); 312 TargetRegistry::RegisterMCObjectStreamer(ThePPC64LETarget, createMCStreamer); 313 314 // Register the asm streamer. 315 TargetRegistry::RegisterAsmStreamer(ThePPC32Target, createMCAsmStreamer); 316 TargetRegistry::RegisterAsmStreamer(ThePPC64Target, createMCAsmStreamer); 317 TargetRegistry::RegisterAsmStreamer(ThePPC64LETarget, createMCAsmStreamer); 318 319 // Register the MCInstPrinter. 320 TargetRegistry::RegisterMCInstPrinter(ThePPC32Target, createPPCMCInstPrinter); 321 TargetRegistry::RegisterMCInstPrinter(ThePPC64Target, createPPCMCInstPrinter); 322 TargetRegistry::RegisterMCInstPrinter(ThePPC64LETarget, 323 createPPCMCInstPrinter); 324 } 325