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 "MCTargetDesc/X86MCAsmInfo.h"
11 #include "llvm/BinaryFormat/Dwarf.h"
12 #include "llvm/MC/MCExpr.h"
13 #include "llvm/MC/MCValue.h"
14 #include "llvm/Target/TargetMachine.h"
15
16 using namespace llvm;
17 using namespace dwarf;
18
getTTypeGlobalReference(const GlobalValue * GV,unsigned Encoding,const TargetMachine & TM,MachineModuleInfo * MMI,MCStreamer & Streamer) const19 const MCExpr *X86_64MachoTargetObjectFile::getTTypeGlobalReference(
20 const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM,
21 MachineModuleInfo *MMI, MCStreamer &Streamer) const {
22
23 // On Darwin/X86-64, we can reference dwarf symbols with foo@GOTPCREL+4, which
24 // is an indirect pc-relative reference.
25 if ((Encoding & DW_EH_PE_indirect) && (Encoding & DW_EH_PE_pcrel)) {
26 const MCSymbol *Sym = TM.getSymbol(GV);
27 const MCExpr *Res =
28 MCSymbolRefExpr::create(Sym, X86::S_GOTPCREL, getContext());
29 const MCExpr *Four = MCConstantExpr::create(4, getContext());
30 return MCBinaryExpr::createAdd(Res, Four, getContext());
31 }
32
33 return TargetLoweringObjectFileMachO::getTTypeGlobalReference(
34 GV, Encoding, TM, MMI, Streamer);
35 }
36
getCFIPersonalitySymbol(const GlobalValue * GV,const TargetMachine & TM,MachineModuleInfo * MMI) const37 MCSymbol *X86_64MachoTargetObjectFile::getCFIPersonalitySymbol(
38 const GlobalValue *GV, const TargetMachine &TM,
39 MachineModuleInfo *MMI) const {
40 return TM.getSymbol(GV);
41 }
42
getIndirectSymViaGOTPCRel(const GlobalValue * GV,const MCSymbol * Sym,const MCValue & MV,int64_t Offset,MachineModuleInfo * MMI,MCStreamer & Streamer) const43 const MCExpr *X86_64MachoTargetObjectFile::getIndirectSymViaGOTPCRel(
44 const GlobalValue *GV, const MCSymbol *Sym, const MCValue &MV,
45 int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const {
46 // On Darwin/X86-64, we need to use foo@GOTPCREL+4 to access the got entry
47 // from a data section. In case there's an additional offset, then use
48 // foo@GOTPCREL+4+<offset>.
49 unsigned FinalOff = Offset+MV.getConstant()+4;
50 const MCExpr *Res =
51 MCSymbolRefExpr::create(Sym, X86::S_GOTPCREL, getContext());
52 const MCExpr *Off = MCConstantExpr::create(FinalOff, getContext());
53 return MCBinaryExpr::createAdd(Res, Off, getContext());
54 }
55
X86ELFTargetObjectFile()56 X86ELFTargetObjectFile::X86ELFTargetObjectFile() {
57 PLTRelativeSpecifier = X86::S_PLT;
58 }
59
getDebugThreadLocalSymbol(const MCSymbol * Sym) const60 const MCExpr *X86ELFTargetObjectFile::getDebugThreadLocalSymbol(
61 const MCSymbol *Sym) const {
62 return MCSymbolRefExpr::create(Sym, X86::S_DTPOFF, getContext());
63 }
64
getIndirectSymViaGOTPCRel(const GlobalValue * GV,const MCSymbol * Sym,const MCValue & MV,int64_t Offset,MachineModuleInfo * MMI,MCStreamer & Streamer) const65 const MCExpr *X86_64ELFTargetObjectFile::getIndirectSymViaGOTPCRel(
66 const GlobalValue *GV, const MCSymbol *Sym, const MCValue &MV,
67 int64_t Offset, MachineModuleInfo *MMI, MCStreamer &Streamer) const {
68 int64_t FinalOffset = Offset + MV.getConstant();
69 const MCExpr *Res =
70 MCSymbolRefExpr::create(Sym, X86::S_GOTPCREL, getContext());
71 const MCExpr *Off = MCConstantExpr::create(FinalOffset, getContext());
72 return MCBinaryExpr::createAdd(Res, Off, getContext());
73 }
74