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/MCContext.h" 19 #include "llvm/MC/MCELFStreamer.h" 20 #include "llvm/MC/MCExpr.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/MCSymbolELF.h" 26 #include "llvm/MC/MachineLocation.h" 27 #include "llvm/Support/ELF.h" 28 #include "llvm/Support/ErrorHandling.h" 29 #include "llvm/Support/FormattedStream.h" 30 #include "llvm/Support/TargetRegistry.h" 31 32 using namespace llvm; 33 34 #define GET_INSTRINFO_MC_DESC 35 #include "PPCGenInstrInfo.inc" 36 37 #define GET_SUBTARGETINFO_MC_DESC 38 #include "PPCGenSubtargetInfo.inc" 39 40 #define GET_REGINFO_MC_DESC 41 #include "PPCGenRegisterInfo.inc" 42 43 // Pin the vtable to this file. 44 PPCTargetStreamer::~PPCTargetStreamer() {} 45 PPCTargetStreamer::PPCTargetStreamer(MCStreamer &S) : MCTargetStreamer(S) {} 46 47 static MCInstrInfo *createPPCMCInstrInfo() { 48 MCInstrInfo *X = new MCInstrInfo(); 49 InitPPCMCInstrInfo(X); 50 return X; 51 } 52 53 static MCRegisterInfo *createPPCMCRegisterInfo(const Triple &TT) { 54 bool isPPC64 = 55 (TT.getArch() == Triple::ppc64 || TT.getArch() == Triple::ppc64le); 56 unsigned Flavour = isPPC64 ? 0 : 1; 57 unsigned RA = isPPC64 ? PPC::LR8 : PPC::LR; 58 59 MCRegisterInfo *X = new MCRegisterInfo(); 60 InitPPCMCRegisterInfo(X, RA, Flavour, Flavour); 61 return X; 62 } 63 64 static MCSubtargetInfo *createPPCMCSubtargetInfo(const Triple &TT, 65 StringRef CPU, StringRef FS) { 66 return createPPCMCSubtargetInfoImpl(TT, CPU, FS); 67 } 68 69 static MCAsmInfo *createPPCMCAsmInfo(const MCRegisterInfo &MRI, 70 const Triple &TheTriple) { 71 bool isPPC64 = (TheTriple.getArch() == Triple::ppc64 || 72 TheTriple.getArch() == Triple::ppc64le); 73 74 MCAsmInfo *MAI; 75 if (TheTriple.isOSDarwin()) 76 MAI = new PPCMCAsmInfoDarwin(isPPC64, TheTriple); 77 else 78 MAI = new PPCELFMCAsmInfo(isPPC64, TheTriple); 79 80 // Initial state of the frame pointer is R1. 81 unsigned Reg = isPPC64 ? PPC::X1 : PPC::R1; 82 MCCFIInstruction Inst = 83 MCCFIInstruction::createDefCfa(nullptr, MRI.getDwarfRegNum(Reg, true), 0); 84 MAI->addInitialFrameState(Inst); 85 86 return MAI; 87 } 88 89 static void adjustCodeGenOpts(const Triple &TT, Reloc::Model RM, 90 CodeModel::Model &CM) { 91 if (CM == CodeModel::Default) { 92 if (!TT.isOSDarwin() && 93 (TT.getArch() == Triple::ppc64 || TT.getArch() == Triple::ppc64le)) 94 CM = CodeModel::Medium; 95 } 96 } 97 98 namespace { 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 void emitTCEntry(const MCSymbol &S) override { 106 OS << "\t.tc "; 107 OS << S.getName(); 108 OS << "[TC],"; 109 OS << S.getName(); 110 OS << '\n'; 111 } 112 void emitMachine(StringRef CPU) override { 113 OS << "\t.machine " << CPU << '\n'; 114 } 115 void emitAbiVersion(int AbiVersion) override { 116 OS << "\t.abiversion " << AbiVersion << '\n'; 117 } 118 void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override { 119 const MCAsmInfo *MAI = Streamer.getContext().getAsmInfo(); 120 121 OS << "\t.localentry\t"; 122 S->print(OS, MAI); 123 OS << ", "; 124 LocalOffset->print(OS, MAI); 125 OS << '\n'; 126 } 127 }; 128 129 class PPCTargetELFStreamer : public PPCTargetStreamer { 130 public: 131 PPCTargetELFStreamer(MCStreamer &S) : PPCTargetStreamer(S) {} 132 MCELFStreamer &getStreamer() { 133 return static_cast<MCELFStreamer &>(Streamer); 134 } 135 void emitTCEntry(const MCSymbol &S) override { 136 // Creates a R_PPC64_TOC relocation 137 Streamer.EmitValueToAlignment(8); 138 Streamer.EmitSymbolValue(&S, 8); 139 } 140 void emitMachine(StringRef CPU) override { 141 // FIXME: Is there anything to do in here or does this directive only 142 // limit the parser? 143 } 144 void emitAbiVersion(int AbiVersion) override { 145 MCAssembler &MCA = getStreamer().getAssembler(); 146 unsigned Flags = MCA.getELFHeaderEFlags(); 147 Flags &= ~ELF::EF_PPC64_ABI; 148 Flags |= (AbiVersion & ELF::EF_PPC64_ABI); 149 MCA.setELFHeaderEFlags(Flags); 150 } 151 void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override { 152 MCAssembler &MCA = getStreamer().getAssembler(); 153 154 int64_t Res; 155 if (!LocalOffset->evaluateAsAbsolute(Res, MCA)) 156 report_fatal_error(".localentry expression must be absolute."); 157 158 unsigned Encoded = ELF::encodePPC64LocalEntryOffset(Res); 159 if (Res != ELF::decodePPC64LocalEntryOffset(Encoded)) 160 report_fatal_error(".localentry expression cannot be encoded."); 161 162 unsigned Other = S->getOther(); 163 Other &= ~ELF::STO_PPC64_LOCAL_MASK; 164 Other |= Encoded; 165 S->setOther(Other); 166 167 // For GAS compatibility, unless we already saw a .abiversion directive, 168 // set e_flags to indicate ELFv2 ABI. 169 unsigned Flags = MCA.getELFHeaderEFlags(); 170 if ((Flags & ELF::EF_PPC64_ABI) == 0) 171 MCA.setELFHeaderEFlags(Flags | 2); 172 } 173 void emitAssignment(MCSymbol *S, const MCExpr *Value) override { 174 auto *Symbol = cast<MCSymbolELF>(S); 175 // When encoding an assignment to set symbol A to symbol B, also copy 176 // the st_other bits encoding the local entry point offset. 177 if (Value->getKind() != MCExpr::SymbolRef) 178 return; 179 const auto &RhsSym = cast<MCSymbolELF>( 180 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol()); 181 unsigned Other = Symbol->getOther(); 182 Other &= ~ELF::STO_PPC64_LOCAL_MASK; 183 Other |= RhsSym.getOther() & ELF::STO_PPC64_LOCAL_MASK; 184 Symbol->setOther(Other); 185 } 186 }; 187 188 class PPCTargetMachOStreamer : public PPCTargetStreamer { 189 public: 190 PPCTargetMachOStreamer(MCStreamer &S) : PPCTargetStreamer(S) {} 191 void emitTCEntry(const MCSymbol &S) override { 192 llvm_unreachable("Unknown pseudo-op: .tc"); 193 } 194 void emitMachine(StringRef CPU) override { 195 // FIXME: We should update the CPUType, CPUSubType in the Object file if 196 // the new values are different from the defaults. 197 } 198 void emitAbiVersion(int AbiVersion) override { 199 llvm_unreachable("Unknown pseudo-op: .abiversion"); 200 } 201 void emitLocalEntry(MCSymbolELF *S, const MCExpr *LocalOffset) override { 202 llvm_unreachable("Unknown pseudo-op: .localentry"); 203 } 204 }; 205 } 206 207 static MCTargetStreamer *createAsmTargetStreamer(MCStreamer &S, 208 formatted_raw_ostream &OS, 209 MCInstPrinter *InstPrint, 210 bool isVerboseAsm) { 211 return new PPCTargetAsmStreamer(S, OS); 212 } 213 214 static MCTargetStreamer * 215 createObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) { 216 const Triple &TT = STI.getTargetTriple(); 217 if (TT.isOSBinFormatELF()) 218 return new PPCTargetELFStreamer(S); 219 return new PPCTargetMachOStreamer(S); 220 } 221 222 static MCInstPrinter *createPPCMCInstPrinter(const Triple &T, 223 unsigned SyntaxVariant, 224 const MCAsmInfo &MAI, 225 const MCInstrInfo &MII, 226 const MCRegisterInfo &MRI) { 227 return new PPCInstPrinter(MAI, MII, MRI, T.isOSDarwin()); 228 } 229 230 extern "C" void LLVMInitializePowerPCTargetMC() { 231 for (Target *T : {&ThePPC32Target, &ThePPC64Target, &ThePPC64LETarget}) { 232 // Register the MC asm info. 233 RegisterMCAsmInfoFn C(*T, createPPCMCAsmInfo); 234 235 // Register the MC codegen info. 236 TargetRegistry::registerMCAdjustCodeGenOpts(*T, adjustCodeGenOpts); 237 238 // Register the MC instruction info. 239 TargetRegistry::RegisterMCInstrInfo(*T, createPPCMCInstrInfo); 240 241 // Register the MC register info. 242 TargetRegistry::RegisterMCRegInfo(*T, createPPCMCRegisterInfo); 243 244 // Register the MC subtarget info. 245 TargetRegistry::RegisterMCSubtargetInfo(*T, createPPCMCSubtargetInfo); 246 247 // Register the MC Code Emitter 248 TargetRegistry::RegisterMCCodeEmitter(*T, createPPCMCCodeEmitter); 249 250 // Register the asm backend. 251 TargetRegistry::RegisterMCAsmBackend(*T, createPPCAsmBackend); 252 253 // Register the object target streamer. 254 TargetRegistry::RegisterObjectTargetStreamer(*T, 255 createObjectTargetStreamer); 256 257 // Register the asm target streamer. 258 TargetRegistry::RegisterAsmTargetStreamer(*T, createAsmTargetStreamer); 259 260 // Register the MCInstPrinter. 261 TargetRegistry::RegisterMCInstPrinter(*T, createPPCMCInstPrinter); 262 } 263 } 264
