1 //===-- X86TargetObjectFile.cpp - X86 Object Info -------------------------===// 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 #include "X86TargetObjectFile.h" 10 #include "llvm/ADT/StringExtras.h" 11 #include "llvm/BinaryFormat/COFF.h" 12 #include "llvm/BinaryFormat/Dwarf.h" 13 #include "llvm/CodeGen/TargetLowering.h" 14 #include "llvm/IR/Mangler.h" 15 #include "llvm/IR/Operator.h" 16 #include "llvm/MC/MCContext.h" 17 #include "llvm/MC/MCExpr.h" 18 #include "llvm/MC/MCSectionCOFF.h" 19 #include "llvm/MC/MCSectionELF.h" 20 #include "llvm/MC/MCValue.h" 21 22 using namespace llvm; 23 using namespace dwarf; 24 25 const MCExpr *X86_64MachoTargetObjectFile::getTTypeGlobalReference( 26 const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM, 27 MachineModuleInfo *MMI, MCStreamer &Streamer) const { 28 29 // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which 30 // is an indirect pc-relative reference. 31 if ((Encoding & DW_EH_PE_indirect) && (Encoding & DW_EH_PE_pcrel)) { 32 const MCSymbol *Sym = TM.getSymbol(GV); 33 const MCExpr *Res = 34 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext()); 35 const MCExpr *Four = MCConstantExpr::create(4, getContext()); 36 return MCBinaryExpr::createAdd(Res, Four, getContext()); 37 } 38 39 return TargetLoweringObjectFileMachO::getTTypeGlobalReference( 40 GV, Encoding, TM, MMI, Streamer); 41 } 42 43 MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol( 44 const GlobalValue *GV, const TargetMachine &TM, 45 MachineModuleInfo *MMI) const { 46 return TM.getSymbol(GV); 47 } 48 49 const MCExpr *X86_64MachoTargetObjectFile::getIndirectSymViaGOTPCRel( 50 const GlobalValue *GV, const MCSymbol *Sym, const MCValue &MV, 51 int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const { 52 // On Darwin/X86-64, we need to use foo@GOTPCREL+4 to access the got entry 53 // from a data section. In case there's an additional offset, then use 54 // foo@GOTPCREL+4+<offset>. 55 unsigned FinalOff = Offset+MV.getConstant()+4; 56 const MCExpr *Res = 57 MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOTPCREL, getContext()); 58 const MCExpr *Off = MCConstantExpr::create(FinalOff, getContext()); 59 return MCBinaryExpr::createAdd(Res, Off, getContext()); 60 } 61 62 const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol( 63 const MCSymbol *Sym) const { 64 return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_DTPOFF, getContext()); 65 } 66 67 void 68 X86FreeBSDTargetObjectFile::Initialize(MCContext &Ctx, 69 const TargetMachine &TM) { 70 TargetLoweringObjectFileELF::Initialize(Ctx, TM); 71 InitializeELF(TM.Options.UseInitArray); 72 } 73 74 void 75 X86FuchsiaTargetObjectFile::Initialize(MCContext &Ctx, 76 const TargetMachine &TM) { 77 TargetLoweringObjectFileELF::Initialize(Ctx, TM); 78 InitializeELF(TM.Options.UseInitArray); 79 } 80 81 void 82 X86LinuxNaClTargetObjectFile::Initialize(MCContext &Ctx, 83 const TargetMachine &TM) { 84 TargetLoweringObjectFileELF::Initialize(Ctx, TM); 85 InitializeELF(TM.Options.UseInitArray); 86 } 87 88 void X86SolarisTargetObjectFile::Initialize(MCContext &Ctx, 89 const TargetMachine &TM) { 90 TargetLoweringObjectFileELF::Initialize(Ctx, TM); 91 InitializeELF(TM.Options.UseInitArray); 92 } 93