lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp

   1 //===-- MipsMCTargetDesc.cpp - Mips 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 Mips specific target descriptions.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "MipsMCTargetDesc.h"
  14 #include "MipsAsmBackend.h"
  15 #include "MipsELFStreamer.h"
  16 #include "MipsInstPrinter.h"
  17 #include "MipsMCAsmInfo.h"
  18 #include "MipsMCNaCl.h"
  19 #include "MipsTargetStreamer.h"
  20 #include "TargetInfo/MipsTargetInfo.h"
  21 #include "llvm/ADT/Triple.h"
  22 #include "llvm/MC/MCCodeEmitter.h"
  23 #include "llvm/MC/MCELFStreamer.h"
  24 #include "llvm/MC/MCInstrAnalysis.h"
  25 #include "llvm/MC/MCInstrInfo.h"
  26 #include "llvm/MC/MCObjectWriter.h"
  27 #include "llvm/MC/MCRegisterInfo.h"
  28 #include "llvm/MC/MCSubtargetInfo.h"
  29 #include "llvm/MC/MCSymbol.h"
  30 #include "llvm/MC/MachineLocation.h"
  31 #include "llvm/Support/ErrorHandling.h"
  32 #include "llvm/Support/FormattedStream.h"
  33 #include "llvm/Support/TargetRegistry.h"
  34
  35 using namespace llvm;
  36
  37 #define GET_INSTRINFO_MC_DESC
  38 #include "MipsGenInstrInfo.inc"
  39
  40 #define GET_SUBTARGETINFO_MC_DESC
  41 #include "MipsGenSubtargetInfo.inc"
  42
  43 #define GET_REGINFO_MC_DESC
  44 #include "MipsGenRegisterInfo.inc"
  45
  46 /// Select the Mips CPU for the given triple and cpu name.
  47 /// FIXME: Merge with the copy in MipsSubtarget.cpp
  48 StringRef MIPS_MC::selectMipsCPU(const Triple &TT, StringRef CPU) {
  49   if (CPU.empty() || CPU == "generic") {
  50     if (TT.getSubArch() == llvm::Triple::MipsSubArch_r6) {
  51       if (TT.isMIPS32())
  52         CPU = "mips32r6";
  53       else
  54         CPU = "mips64r6";
  55     } else {
  56       if (TT.isMIPS32())
  57         CPU = "mips32";
  58       else
  59         CPU = "mips64";
  60     }
  61   }
  62   return CPU;
  63 }
  64
  65 static MCInstrInfo *createMipsMCInstrInfo() {
  66   MCInstrInfo *X = new MCInstrInfo();
  67   InitMipsMCInstrInfo(X);
  68   return X;
  69 }
  70
  71 static MCRegisterInfo *createMipsMCRegisterInfo(const Triple &TT) {
  72   MCRegisterInfo *X = new MCRegisterInfo();
  73   InitMipsMCRegisterInfo(X, Mips::RA);
  74   return X;
  75 }
  76
  77 static MCSubtargetInfo *createMipsMCSubtargetInfo(const Triple &TT,
  78                                                   StringRef CPU, StringRef FS) {
  79   CPU = MIPS_MC::selectMipsCPU(TT, CPU);
  80   return createMipsMCSubtargetInfoImpl(TT, CPU, FS);
  81 }
  82
  83 static MCAsmInfo *createMipsMCAsmInfo(const MCRegisterInfo &MRI,
  84                                       const Triple &TT) {
  85   MCAsmInfo *MAI = new MipsMCAsmInfo(TT);
  86
  87   unsigned SP = MRI.getDwarfRegNum(Mips::SP, true);
  88   MCCFIInstruction Inst = MCCFIInstruction::createDefCfaRegister(nullptr, SP);
  89   MAI->addInitialFrameState(Inst);
  90
  91   return MAI;
  92 }
  93
  94 static MCInstPrinter *createMipsMCInstPrinter(const Triple &T,
  95                                               unsigned SyntaxVariant,
  96                                               const MCAsmInfo &MAI,
  97                                               const MCInstrInfo &MII,
  98                                               const MCRegisterInfo &MRI) {
  99   return new MipsInstPrinter(MAI, MII, MRI);
 100 }
 101
 102 static MCStreamer *createMCStreamer(const Triple &T, MCContext &Context,
 103                                     std::unique_ptr<MCAsmBackend> &&MAB,
 104                                     std::unique_ptr<MCObjectWriter> &&OW,
 105                                     std::unique_ptr<MCCodeEmitter> &&Emitter,
 106                                     bool RelaxAll) {
 107   MCStreamer *S;
 108   if (!T.isOSNaCl())
 109     S = createMipsELFStreamer(Context, std::move(MAB), std::move(OW),
 110                               std::move(Emitter), RelaxAll);
 111   else
 112     S = createMipsNaClELFStreamer(Context, std::move(MAB), std::move(OW),
 113                                   std::move(Emitter), RelaxAll);
 114   return S;
 115 }
 116
 117 static MCTargetStreamer *createMipsAsmTargetStreamer(MCStreamer &S,
 118                                                      formatted_raw_ostream &OS,
 119                                                      MCInstPrinter *InstPrint,
 120                                                      bool isVerboseAsm) {
 121   return new MipsTargetAsmStreamer(S, OS);
 122 }
 123
 124 static MCTargetStreamer *createMipsNullTargetStreamer(MCStreamer &S) {
 125   return new MipsTargetStreamer(S);
 126 }
 127
 128 static MCTargetStreamer *
 129 createMipsObjectTargetStreamer(MCStreamer &S, const MCSubtargetInfo &STI) {
 130   return new MipsTargetELFStreamer(S, STI);
 131 }
 132
 133 namespace {
 134
 135 class MipsMCInstrAnalysis : public MCInstrAnalysis {
 136 public:
 137   MipsMCInstrAnalysis(const MCInstrInfo *Info) : MCInstrAnalysis(Info) {}
 138
 139   bool evaluateBranch(const MCInst &Inst, uint64_t Addr, uint64_t Size,
 140                       uint64_t &Target) const override {
 141     unsigned NumOps = Inst.getNumOperands();
 142     if (NumOps == 0)
 143       return false;
 144     switch (Info->get(Inst.getOpcode()).OpInfo[NumOps - 1].OperandType) {
 145     case MCOI::OPERAND_UNKNOWN:
 146     case MCOI::OPERAND_IMMEDIATE: {
 147       // j, jal, jalx, jals
 148       // Absolute branch within the current 256 MB-aligned region
 149       uint64_t Region = Addr & ~uint64_t(0xfffffff);
 150       Target = Region + Inst.getOperand(NumOps - 1).getImm();
 151       return true;
 152     }
 153     case MCOI::OPERAND_PCREL:
 154       // b, beq ...
 155       Target = Addr + Inst.getOperand(NumOps - 1).getImm();
 156       return true;
 157     default:
 158       return false;
 159     }
 160   }
 161 };
 162 }
 163
 164 static MCInstrAnalysis *createMipsMCInstrAnalysis(const MCInstrInfo *Info) {
 165   return new MipsMCInstrAnalysis(Info);
 166 }
 167
 168 extern "C" void LLVMInitializeMipsTargetMC() {
 169   for (Target *T : {&getTheMipsTarget(), &getTheMipselTarget(),
 170                     &getTheMips64Target(), &getTheMips64elTarget()}) {
 171     // Register the MC asm info.
 172     RegisterMCAsmInfoFn X(*T, createMipsMCAsmInfo);
 173
 174     // Register the MC instruction info.
 175     TargetRegistry::RegisterMCInstrInfo(*T, createMipsMCInstrInfo);
 176
 177     // Register the MC register info.
 178     TargetRegistry::RegisterMCRegInfo(*T, createMipsMCRegisterInfo);
 179
 180     // Register the elf streamer.
 181     TargetRegistry::RegisterELFStreamer(*T, createMCStreamer);
 182
 183     // Register the asm target streamer.
 184     TargetRegistry::RegisterAsmTargetStreamer(*T, createMipsAsmTargetStreamer);
 185
 186     TargetRegistry::RegisterNullTargetStreamer(*T,
 187                                                createMipsNullTargetStreamer);
 188
 189     // Register the MC subtarget info.
 190     TargetRegistry::RegisterMCSubtargetInfo(*T, createMipsMCSubtargetInfo);
 191
 192     // Register the MC instruction analyzer.
 193     TargetRegistry::RegisterMCInstrAnalysis(*T, createMipsMCInstrAnalysis);
 194
 195     // Register the MCInstPrinter.
 196     TargetRegistry::RegisterMCInstPrinter(*T, createMipsMCInstPrinter);
 197
 198     TargetRegistry::RegisterObjectTargetStreamer(
 199         *T, createMipsObjectTargetStreamer);
 200
 201     // Register the asm backend.
 202     TargetRegistry::RegisterMCAsmBackend(*T, createMipsAsmBackend);
 203   }
 204
 205   // Register the MC Code Emitter
 206   for (Target *T : {&getTheMipsTarget(), &getTheMips64Target()})
 207     TargetRegistry::RegisterMCCodeEmitter(*T, createMipsMCCodeEmitterEB);
 208
 209   for (Target *T : {&getTheMipselTarget(), &getTheMips64elTarget()})
 210     TargetRegistry::RegisterMCCodeEmitter(*T, createMipsMCCodeEmitterEL);
 211 }