1249259Sdim//===-- AArch64TargetObjectFile.cpp - AArch64 Object Info -----------------===// 2249259Sdim// 3353358Sdim// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4353358Sdim// See https://llvm.org/LICENSE.txt for license information. 5353358Sdim// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6249259Sdim// 7249259Sdim//===----------------------------------------------------------------------===// 8249259Sdim 9249259Sdim#include "AArch64TargetObjectFile.h" 10276479Sdim#include "AArch64TargetMachine.h" 11321369Sdim#include "llvm/BinaryFormat/Dwarf.h" 12276479Sdim#include "llvm/IR/Mangler.h" 13276479Sdim#include "llvm/MC/MCContext.h" 14276479Sdim#include "llvm/MC/MCExpr.h" 15276479Sdim#include "llvm/MC/MCStreamer.h" 16288943Sdim#include "llvm/MC/MCValue.h" 17249259Sdimusing namespace llvm; 18276479Sdimusing namespace dwarf; 19249259Sdim 20276479Sdimvoid AArch64_ELFTargetObjectFile::Initialize(MCContext &Ctx, 21276479Sdim const TargetMachine &TM) { 22249259Sdim TargetLoweringObjectFileELF::Initialize(Ctx, TM); 23249259Sdim InitializeELF(TM.Options.UseInitArray); 24344779Sdim // AARCH64 ELF ABI does not define static relocation type for TLS offset 25344779Sdim // within a module. Do not generate AT_location for TLS variables. 26344779Sdim SupportDebugThreadLocalLocation = false; 27249259Sdim} 28265925Sdim 29288943SdimAArch64_MachoTargetObjectFile::AArch64_MachoTargetObjectFile() 30288943Sdim : TargetLoweringObjectFileMachO() { 31288943Sdim SupportGOTPCRelWithOffset = false; 32288943Sdim} 33288943Sdim 34276479Sdimconst MCExpr *AArch64_MachoTargetObjectFile::getTTypeGlobalReference( 35314564Sdim const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM, 36314564Sdim MachineModuleInfo *MMI, MCStreamer &Streamer) const { 37276479Sdim // On Darwin, we can reference dwarf symbols with foo@GOT-., which 38276479Sdim // is an indirect pc-relative reference. The default implementation 39276479Sdim // won't reference using the GOT, so we need this target-specific 40276479Sdim // version. 41276479Sdim if (Encoding & (DW_EH_PE_indirect | DW_EH_PE_pcrel)) { 42314564Sdim const MCSymbol *Sym = TM.getSymbol(GV); 43276479Sdim const MCExpr *Res = 44288943Sdim MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOT, getContext()); 45288943Sdim MCSymbol *PCSym = getContext().createTempSymbol(); 46276479Sdim Streamer.EmitLabel(PCSym); 47288943Sdim const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext()); 48288943Sdim return MCBinaryExpr::createSub(Res, PC, getContext()); 49276479Sdim } 50276479Sdim 51276479Sdim return TargetLoweringObjectFileMachO::getTTypeGlobalReference( 52314564Sdim GV, Encoding, TM, MMI, Streamer); 53265925Sdim} 54276479Sdim 55276479SdimMCSymbol *AArch64_MachoTargetObjectFile::getCFIPersonalitySymbol( 56314564Sdim const GlobalValue *GV, const TargetMachine &TM, 57276479Sdim MachineModuleInfo *MMI) const { 58314564Sdim return TM.getSymbol(GV); 59276479Sdim} 60288943Sdim 61288943Sdimconst MCExpr *AArch64_MachoTargetObjectFile::getIndirectSymViaGOTPCRel( 62360784Sdim const GlobalValue *GV, const MCSymbol *Sym, const MCValue &MV, 63360784Sdim int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const { 64288943Sdim assert((Offset+MV.getConstant() == 0) && 65288943Sdim "Arch64 does not support GOT PC rel with extra offset"); 66288943Sdim // On ARM64 Darwin, we can reference symbols with foo@GOT-., which 67288943Sdim // is an indirect pc-relative reference. 68288943Sdim const MCExpr *Res = 69288943Sdim MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_GOT, getContext()); 70288943Sdim MCSymbol *PCSym = getContext().createTempSymbol(); 71288943Sdim Streamer.EmitLabel(PCSym); 72288943Sdim const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext()); 73288943Sdim return MCBinaryExpr::createSub(Res, PC, getContext()); 74288943Sdim} 75321369Sdim 76321369Sdimvoid AArch64_MachoTargetObjectFile::getNameWithPrefix( 77321369Sdim SmallVectorImpl<char> &OutName, const GlobalValue *GV, 78321369Sdim const TargetMachine &TM) const { 79321369Sdim // AArch64 does not use section-relative relocations so any global symbol must 80321369Sdim // be accessed via at least a linker-private symbol. 81321369Sdim getMangler().getNameWithPrefix(OutName, GV, /* CannotUsePrivateLabel */ true); 82321369Sdim} 83