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 "MCTargetDesc/PPCMCTargetDesc.h" 15 #include "InstPrinter/PPCInstPrinter.h" 16 #include "MCTargetDesc/PPCMCAsmInfo.h" 17 #include "PPCTargetStreamer.h" 18 #include "llvm/ADT/StringRef.h" 19 #include "llvm/ADT/Triple.h" 20 #include "llvm/BinaryFormat/ELF.h" 21 #include "llvm/MC/MCAssembler.h" 22 #include "llvm/MC/MCContext.h" 23 #include "llvm/MC/MCDwarf.h" 24 #include "llvm/MC/MCELFStreamer.h" 25 #include "llvm/MC/MCExpr.h" 26 #include "llvm/MC/MCInstrInfo.h" 27 #include "llvm/MC/MCRegisterInfo.h" 28 #include "llvm/MC/MCStreamer.h" 29 #include "llvm/MC/MCSubtargetInfo.h" 30 #include "llvm/MC/MCSymbol.h" 31 #include "llvm/MC/MCSymbolELF.h" 32 #include "llvm/Support/Casting.h" 33 #include "llvm/Support/CodeGen.h" 34 #include "llvm/Support/ErrorHandling.h" 35 #include "llvm/Support/FormattedStream.h" 36 #include "llvm/Support/TargetRegistry.h" 37 #include "llvm/Support/raw_ostream.h" 38 39 using namespace llvm; 40 41 #define GET_INSTRINFO_MC_DESC 42 #include "PPCGenInstrInfo.inc" 43 44 #define GET_SUBTARGETINFO_MC_DESC 45 #include "PPCGenSubtargetInfo.inc" 46 47 #define GET_REGINFO_MC_DESC 48 #include "PPCGenRegisterInfo.inc" 49 50 // Pin the vtable to this file. 51 PPCTargetStreamer::PPCTargetStreamer(MCStreamer &S) : MCTargetStreamer(S) {} 52 53 PPCTargetStreamer::~PPCTargetStreamer() = default; 54 55 static MCInstrInfo *createPPCMCInstrInfo() { 56 MCInstrInfo *X = new MCInstrInfo(); 57 InitPPCMCInstrInfo(X); 58 return X; 59 } 60 61 static MCRegisterInfo *createPPCMCRegisterInfo(const Triple &TT) { 62 bool isPPC64 = 63 (TT.getArch() == Triple::ppc64 || TT.getArch() == Triple::ppc64le); 64 unsigned Flavour = isPPC64 ? 0 : 1; 65 unsigned RA = isPPC64 ? PPC::LR8 : PPC::LR; 66 67 MCRegisterInfo *X = new MCRegisterInfo(); 68 InitPPCMCRegisterInfo(X, RA, Flavour, Flavour); 69 return X; 70 } 71 72 static MCSubtargetInfo *createPPCMCSubtargetInfo(const Triple &TT, 73 StringRef CPU, StringRef FS) { 74 return createPPCMCSubtargetInfoImpl(TT, CPU, FS); 75 } 76 77 static MCAsmInfo *createPPCMCAsmInfo(const MCRegisterInfo &MRI, 78 const Triple &TheTriple) { 79 bool isPPC64 = (TheTriple.getArch() == Triple::ppc64 || 80 TheTriple.getArch() == Triple::ppc64le); 81 82 MCAsmInfo *MAI; 83 if (TheTriple.isOSDarwin()) 84 MAI = new PPCMCAsmInfoDarwin(isPPC64, TheTriple); 85 else 86 MAI = new PPCELFMCAsmInfo(isPPC64, TheTriple); 87 88 // Initial state of the frame pointer is R1. 89 unsigned Reg = isPPC64 ? PPC::X1 : PPC::R1; 90 MCCFIInstruction Inst = 91 MCCFIInstruction::createDefCfa(nullptr, MRI.getDwarfRegNum(Reg, true), 0); 92 MAI->addInitialFrameState(Inst); 93 94 return MAI; 95 } 96 97 namespace { 98 99 class PPCTargetAsmStreamer : public PPCTargetStreamer { 100 formatted_raw_ostream &OS; 101 102 public: 103 PPCTargetAsmStreamer(MCStreamer &S, formatted_raw_ostream &OS) 104 : PPCTargetStreamer(S), OS(OS) {} 105 106 void emitTCEntry(const MCSymbol &S) override { 107 OS << "\t.tc "; 108 OS << S.getName(); 109 OS << "[TC],"; 110 OS << S.getName(); 111 OS << '\n'; 112 } 113 114 void emitMachine(StringRef CPU) override { 115 OS << "\t.machine " << CPU << '\n'; 116 } 117 118 void emitAbiVersion(int AbiVersion) override { 119 OS << "\t.abiversion " << AbiVersion << '\n'; 120 } 121 122 void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override { 123 const MCAsmInfo *MAI = Streamer.getContext().getAsmInfo(); 124 125 OS << "\t.localentry\t"; 126 S->print(OS, MAI); 127 OS << ", "; 128 LocalOffset->print(OS, MAI); 129 OS << '\n'; 130 } 131 }; 132 133 class PPCTargetELFStreamer : public PPCTargetStreamer { 134 public: 135 PPCTargetELFStreamer(MCStreamer &S) : PPCTargetStreamer(S) {} 136 137 MCELFStreamer &getStreamer() { 138 return static_cast<MCELFStreamer &>(Streamer); 139 } 140 141 void emitTCEntry(const MCSymbol &S) override { 142 // Creates a R_PPC64_TOC relocation 143 Streamer.EmitValueToAlignment(8); 144 Streamer.EmitSymbolValue(&S, 8); 145 } 146 147 void emitMachine(StringRef CPU) override { 148 // FIXME: Is there anything to do in here or does this directive only 149 // limit the parser? 150 } 151 152 void emitAbiVersion(int AbiVersion) override { 153 MCAssembler &MCA = getStreamer().getAssembler(); 154 unsigned Flags = MCA.getELFHeaderEFlags(); 155 Flags &= ~ELF::EF_PPC64_ABI; 156 Flags |= (AbiVersion & ELF::EF_PPC64_ABI); 157 MCA.setELFHeaderEFlags(Flags); 158 } 159 160 void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override { 161 MCAssembler &MCA = getStreamer().getAssembler(); 162 163 int64_t Res; 164 if (!LocalOffset->evaluateAsAbsolute(Res, MCA)) 165 report_fatal_error(".localentry expression must be absolute."); 166 167 unsigned Encoded = ELF::encodePPC64LocalEntryOffset(Res); 168 if (Res != ELF::decodePPC64LocalEntryOffset(Encoded)) 169 report_fatal_error(".localentry expression cannot be encoded."); 170 171 unsigned Other = S->getOther(); 172 Other &= ~ELF::STO_PPC64_LOCAL_MASK; 173 Other |= Encoded; 174 S->setOther(Other); 175 176 // For GAS compatibility, unless we already saw a .abiversion directive, 177 // set e_flags to indicate ELFv2 ABI. 178 unsigned Flags = MCA.getELFHeaderEFlags(); 179 if ((Flags & ELF::EF_PPC64_ABI) == 0) 180 MCA.setELFHeaderEFlags(Flags | 2); 181 } 182 183 void emitAssignment(MCSymbol *S, const MCExpr *Value) override { 184 auto *Symbol = cast<MCSymbolELF>(S); 185 // When encoding an assignment to set symbol A to symbol B, also copy 186 // the st_other bits encoding the local entry point offset. 187 if (Value->getKind() != MCExpr::SymbolRef) 188 return; 189 const auto &RhsSym = cast<MCSymbolELF>( 190 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol()); 191 unsigned Other = Symbol->getOther(); 192 Other &= ~ELF::STO_PPC64_LOCAL_MASK; 193 Other |= RhsSym.getOther() & ELF::STO_PPC64_LOCAL_MASK; 194 Symbol->setOther(Other); 195 } 196 }; 197 198 class PPCTargetMachOStreamer : public PPCTargetStreamer { 199 public: 200 PPCTargetMachOStreamer(MCStreamer &S) : PPCTargetStreamer(S) {} 201 202 void emitTCEntry(const MCSymbol &S) override { 203 llvm_unreachable("Unknown pseudo-op: .tc"); 204 } 205 206 void emitMachine(StringRef CPU) override { 207 // FIXME: We should update the CPUType, CPUSubType in the Object file if 208 // the new values are different from the defaults. 209 } 210 211 void emitAbiVersion(int AbiVersion) override { 212 llvm_unreachable("Unknown pseudo-op: .abiversion"); 213 } 214 215 void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override { 216 llvm_unreachable("Unknown pseudo-op: .localentry"); 217 } 218 }; 219 220 } // end anonymous namespace 221 222 static MCTargetStreamer *createAsmTargetStreamer(MCStreamer &S, 223 formatted_raw_ostream &OS, 224 MCInstPrinter *InstPrint, 225 bool isVerboseAsm) { 226 return new PPCTargetAsmStreamer(S, OS); 227 } 228 229 static MCTargetStreamer * 230 createObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) { 231 const Triple &TT = STI.getTargetTriple(); 232 if (TT.isOSBinFormatELF()) 233 return new PPCTargetELFStreamer(S); 234 return new PPCTargetMachOStreamer(S); 235 } 236 237 static MCInstPrinter *createPPCMCInstPrinter(const Triple &T, 238 unsigned SyntaxVariant, 239 const MCAsmInfo &MAI, 240 const MCInstrInfo &MII, 241 const MCRegisterInfo &MRI) { 242 return new PPCInstPrinter(MAI, MII, MRI, T); 243 } 244 245 extern "C" void LLVMInitializePowerPCTargetMC() { 246 for (Target *T : 247 {&getThePPC32Target(), &getThePPC64Target(), &getThePPC64LETarget()}) { 248 // Register the MC asm info. 249 RegisterMCAsmInfoFn C(*T, createPPCMCAsmInfo); 250 251 // Register the MC instruction info. 252 TargetRegistry::RegisterMCInstrInfo(*T, createPPCMCInstrInfo); 253 254 // Register the MC register info. 255 TargetRegistry::RegisterMCRegInfo(*T, createPPCMCRegisterInfo); 256 257 // Register the MC subtarget info. 258 TargetRegistry::RegisterMCSubtargetInfo(*T, createPPCMCSubtargetInfo); 259 260 // Register the MC Code Emitter 261 TargetRegistry::RegisterMCCodeEmitter(*T, createPPCMCCodeEmitter); 262 263 // Register the asm backend. 264 TargetRegistry::RegisterMCAsmBackend(*T, createPPCAsmBackend); 265 266 // Register the object target streamer. 267 TargetRegistry::RegisterObjectTargetStreamer(*T, 268 createObjectTargetStreamer); 269 270 // Register the asm target streamer. 271 TargetRegistry::RegisterAsmTargetStreamer(*T, createAsmTargetStreamer); 272 273 // Register the MCInstPrinter. 274 TargetRegistry::RegisterMCInstPrinter(*T, createPPCMCInstPrinter); 275 } 276 } 277
