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https://github.com/c64scene-ar/llvm-6502.git
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dfc6383227
Add MachO 32-bit (i.e. arm and x86) support for replacing global GOT equivalent
symbol accesses. Unlike 64-bit targets, there's no GOTPCREL relocation, and
access through a non_lazy_symbol_pointers section is used instead.
-- before
_extgotequiv:
.long _extfoo
_delta:
.long _extgotequiv-_delta
-- after
_delta:
.long L_extfoo$non_lazy_ptr-_delta
.section __IMPORT,__pointers,non_lazy_symbol_pointers
L_extfoo$non_lazy_ptr:
.indirect_symbol _extfoo
.long 0
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231475 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
2.8 KiB
C++
74 lines
2.8 KiB
C++
//===-- AArch64TargetObjectFile.cpp - AArch64 Object Info -----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "AArch64TargetObjectFile.h"
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#include "AArch64TargetMachine.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/Dwarf.h"
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using namespace llvm;
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using namespace dwarf;
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void AArch64_ELFTargetObjectFile::Initialize(MCContext &Ctx,
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const TargetMachine &TM) {
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TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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InitializeELF(TM.Options.UseInitArray);
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}
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AArch64_MachoTargetObjectFile::AArch64_MachoTargetObjectFile()
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: TargetLoweringObjectFileMachO() {
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SupportGOTPCRelWithOffset = false;
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}
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const MCExpr *AArch64_MachoTargetObjectFile::getTTypeGlobalReference(
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const GlobalValue *GV, unsigned Encoding, Mangler &Mang,
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const TargetMachine &TM, MachineModuleInfo *MMI,
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MCStreamer &Streamer) const {
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// On Darwin, we can reference dwarf symbols with foo@GOT-., which
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// is an indirect pc-relative reference. The default implementation
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// won't reference using the GOT, so we need this target-specific
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// version.
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if (Encoding & (DW_EH_PE_indirect | DW_EH_PE_pcrel)) {
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const MCSymbol *Sym = TM.getSymbol(GV, Mang);
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const MCExpr *Res =
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MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOT, getContext());
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MCSymbol *PCSym = getContext().CreateTempSymbol();
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Streamer.EmitLabel(PCSym);
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const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, getContext());
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return MCBinaryExpr::CreateSub(Res, PC, getContext());
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}
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return TargetLoweringObjectFileMachO::getTTypeGlobalReference(
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GV, Encoding, Mang, TM, MMI, Streamer);
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}
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MCSymbol *AArch64_MachoTargetObjectFile::getCFIPersonalitySymbol(
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const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM,
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MachineModuleInfo *MMI) const {
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return TM.getSymbol(GV, Mang);
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}
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const MCExpr *AArch64_MachoTargetObjectFile::getIndirectSymViaGOTPCRel(
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const MCSymbol *Sym, const MCValue &MV, int64_t Offset,
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MachineModuleInfo *MMI, MCStreamer &Streamer) const {
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assert((Offset+MV.getConstant() == 0) &&
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"Arch64 does not support GOT PC rel with extra offset");
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// On ARM64 Darwin, we can reference symbols with foo@GOT-., which
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// is an indirect pc-relative reference.
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const MCExpr *Res =
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MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOT, getContext());
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MCSymbol *PCSym = getContext().CreateTempSymbol();
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Streamer.EmitLabel(PCSym);
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const MCExpr *PC = MCSymbolRefExpr::Create(PCSym, getContext());
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return MCBinaryExpr::CreateSub(Res, PC, getContext());
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}
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