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 PPCELFMCAsmInfo(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 void emitAbiVersion(int AbiVersion) override { 133 OS << "\t.abiversion " << AbiVersion << '\n'; 134 } 135 void emitLocalEntry(MCSymbol *S, const MCExpr *LocalOffset) override { 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 void emitTCEntry(const MCSymbol &S) override { 147 // Creates a R_PPC64_TOC relocation 148 Streamer.EmitValueToAlignment(8); 149 Streamer.EmitSymbolValue(&S, 8); 150 } 151 void emitMachine(StringRef CPU) override { 152 // FIXME: Is there anything to do in here or does this directive only 153 // limit the parser? 154 } 155 void emitAbiVersion(int AbiVersion) override { 156 MCAssembler &MCA = getStreamer().getAssembler(); 157 unsigned Flags = MCA.getELFHeaderEFlags(); 158 Flags &= ~ELF::EF_PPC64_ABI; 159 Flags |= (AbiVersion & ELF::EF_PPC64_ABI); 160 MCA.setELFHeaderEFlags(Flags); 161 } 162 void emitLocalEntry(MCSymbol *S, const MCExpr *LocalOffset) override { 163 MCAssembler &MCA = getStreamer().getAssembler(); 164 MCSymbolData &Data = getStreamer().getOrCreateSymbolData(S); 165 166 int64_t Res; 167 if (!LocalOffset->EvaluateAsAbsolute(Res, MCA)) 168 report_fatal_error(".localentry expression must be absolute."); 169 170 unsigned Encoded = ELF::encodePPC64LocalEntryOffset(Res); 171 if (Res != ELF::decodePPC64LocalEntryOffset(Encoded)) 172 report_fatal_error(".localentry expression cannot be encoded."); 173 174 // The "other" values are stored in the last 6 bits of the second byte. 175 // The traditional defines for STO values assume the full byte and thus 176 // the shift to pack it. 177 unsigned Other = MCELF::getOther(Data) << 2; 178 Other &= ~ELF::STO_PPC64_LOCAL_MASK; 179 Other |= Encoded; 180 MCELF::setOther(Data, Other >> 2); 181 182 // For GAS compatibility, unless we already saw a .abiversion directive, 183 // set e_flags to indicate ELFv2 ABI. 184 unsigned Flags = MCA.getELFHeaderEFlags(); 185 if ((Flags & ELF::EF_PPC64_ABI) == 0) 186 MCA.setELFHeaderEFlags(Flags | 2); 187 } 188 void emitAssignment(MCSymbol *Symbol, const MCExpr *Value) override { 189 // When encoding an assignment to set symbol A to symbol B, also copy 190 // the st_other bits encoding the local entry point offset. 191 if (Value->getKind() != MCExpr::SymbolRef) 192 return; 193 const MCSymbol &RhsSym = 194 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol(); 195 MCSymbolData &Data = getStreamer().getOrCreateSymbolData(&RhsSym); 196 MCSymbolData &SymbolData = getStreamer().getOrCreateSymbolData(Symbol); 197 // The "other" values are stored in the last 6 bits of the second byte. 198 // The traditional defines for STO values assume the full byte and thus 199 // the shift to pack it. 200 unsigned Other = MCELF::getOther(SymbolData) << 2; 201 Other &= ~ELF::STO_PPC64_LOCAL_MASK; 202 Other |= (MCELF::getOther(Data) << 2) & ELF::STO_PPC64_LOCAL_MASK; 203 MCELF::setOther(SymbolData, Other >> 2); 204 } 205 }; 206 207 class PPCTargetMachOStreamer : public PPCTargetStreamer { 208 public: 209 PPCTargetMachOStreamer(MCStreamer &S) : PPCTargetStreamer(S) {} 210 void emitTCEntry(const MCSymbol &S) override { 211 llvm_unreachable("Unknown pseudo-op: .tc"); 212 } 213 void emitMachine(StringRef CPU) override { 214 // FIXME: We should update the CPUType, CPUSubType in the Object file if 215 // the new values are different from the defaults. 216 } 217 void emitAbiVersion(int AbiVersion) override { 218 llvm_unreachable("Unknown pseudo-op: .abiversion"); 219 } 220 void emitLocalEntry(MCSymbol *S, const MCExpr *LocalOffset) override { 221 llvm_unreachable("Unknown pseudo-op: .localentry"); 222 } 223 }; 224 } 225 226 static MCTargetStreamer *createAsmTargetStreamer(MCStreamer &S, 227 formatted_raw_ostream &OS, 228 MCInstPrinter *InstPrint, 229 bool isVerboseAsm) { 230 return new PPCTargetAsmStreamer(S, OS); 231 } 232 233 static MCTargetStreamer * 234 createObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) { 235 Triple TT(STI.getTargetTriple()); 236 if (TT.getObjectFormat() == Triple::ELF) 237 return new PPCTargetELFStreamer(S); 238 return new PPCTargetMachOStreamer(S); 239 } 240 241 static MCInstPrinter *createPPCMCInstPrinter(const Triple &T, 242 unsigned SyntaxVariant, 243 const MCAsmInfo &MAI, 244 const MCInstrInfo &MII, 245 const MCRegisterInfo &MRI) { 246 return new PPCInstPrinter(MAI, MII, MRI, T.isOSDarwin()); 247 } 248 249 extern "C" void LLVMInitializePowerPCTargetMC() { 250 for (Target *T : {&ThePPC32Target, &ThePPC64Target, &ThePPC64LETarget}) { 251 // Register the MC asm info. 252 RegisterMCAsmInfoFn C(*T, createPPCMCAsmInfo); 253 254 // Register the MC codegen info. 255 TargetRegistry::RegisterMCCodeGenInfo(*T, createPPCMCCodeGenInfo); 256 257 // Register the MC instruction info. 258 TargetRegistry::RegisterMCInstrInfo(*T, createPPCMCInstrInfo); 259 260 // Register the MC register info. 261 TargetRegistry::RegisterMCRegInfo(*T, createPPCMCRegisterInfo); 262 263 // Register the MC subtarget info. 264 TargetRegistry::RegisterMCSubtargetInfo(*T, createPPCMCSubtargetInfo); 265 266 // Register the MC Code Emitter 267 TargetRegistry::RegisterMCCodeEmitter(*T, createPPCMCCodeEmitter); 268 269 // Register the asm backend. 270 TargetRegistry::RegisterMCAsmBackend(*T, createPPCAsmBackend); 271 272 // Register the object target streamer. 273 TargetRegistry::RegisterObjectTargetStreamer(*T, 274 createObjectTargetStreamer); 275 276 // Register the asm target streamer. 277 TargetRegistry::RegisterAsmTargetStreamer(*T, createAsmTargetStreamer); 278 279 // Register the MCInstPrinter. 280 TargetRegistry::RegisterMCInstPrinter(*T, createPPCMCInstPrinter); 281 } 282 } 283
