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Account for GOT VariantKind on osx-arm64 #185

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merged 1 commit into from
Sep 9, 2022
Merged

Account for GOT VariantKind on osx-arm64 #185

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6 changes: 6 additions & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,12 @@
# as most of those are useless.
#==============================================================================#

# Tool Runtime Dir
.dotnet

# Build results
artifacts

#==============================================================================#
# File extensions to be ignored anywhere in the tree.
#==============================================================================#
Expand Down
50 changes: 47 additions & 3 deletions llvm/tools/objwriter/objwriter.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -205,7 +205,7 @@ void ObjectWriter::SwitchSection(const char *SectionName,
assert(!Section->getBeginSymbol());
// Output a DWARF linker-local symbol.
// This symbol is used as a base for other symbols in a section.
MCSymbol *SectionStartSym = OutContext->createTempSymbol();
MCSymbol *SectionStartSym = OutContext->createLinkerPrivateTempSymbol();
Streamer->emitLabel(SectionStartSym);
Section->setBeginSymbol(SectionStartSym);
}
Expand Down Expand Up @@ -444,6 +444,25 @@ int ObjectWriter::EmitSymbolRef(const char *SymbolName,
Size = 8;
break;
case RelocType::IMAGE_REL_BASED_REL32:
if (ObjFileInfo->getObjectFileType() == ObjFileInfo->IsMachO &&
ObjFileInfo->getTargetTriple().getArch() == Triple::aarch64) {
MCSymbol *TempSymbol = OutContext->createTempSymbol();
Streamer->emitLabel(TempSymbol);
const MCExpr *TargetExpr = MCSymbolRefExpr::create(Symbol, Kind, *OutContext);
const MCSymbolRefExpr *SectionExpr = MCSymbolRefExpr::create(TempSymbol, Kind, *OutContext);
TargetExpr = MCBinaryExpr::createSub(
TargetExpr, SectionExpr, *OutContext);
// If the fixup is pc-relative, we need to bias the value to be relative to
// the start of the field, not the end of the field
TargetExpr = MCBinaryExpr::createSub(
TargetExpr, MCConstantExpr::create(4, *OutContext), *OutContext);
if (Delta != 0) {
TargetExpr = MCBinaryExpr::createAdd(
TargetExpr, MCConstantExpr::create(Delta, *OutContext), *OutContext);
}
Streamer->emitValueImpl(TargetExpr, 4, SMLoc(), false);
return 4;
}
Size = 4;
IsPCRel = true;
if (ObjFileInfo->getObjectFileType() == ObjFileInfo->IsELF) {
Expand All @@ -453,6 +472,21 @@ int ObjectWriter::EmitSymbolRef(const char *SymbolName,
}
break;
case RelocType::IMAGE_REL_BASED_RELPTR32:
if (ObjFileInfo->getObjectFileType() == ObjFileInfo->IsMachO &&
ObjFileInfo->getTargetTriple().getArch() == Triple::aarch64) {
MCSymbol *TempSymbol = OutContext->createTempSymbol();
Streamer->emitLabel(TempSymbol);
const MCExpr *TargetExpr = MCSymbolRefExpr::create(Symbol, Kind, *OutContext);
const MCSymbolRefExpr *SectionExpr = MCSymbolRefExpr::create(TempSymbol, Kind, *OutContext);
TargetExpr = MCBinaryExpr::createSub(
TargetExpr, SectionExpr, *OutContext);
if (Delta != 0) {
TargetExpr = MCBinaryExpr::createAdd(
TargetExpr, MCConstantExpr::create(Delta, *OutContext), *OutContext);
}
Streamer->emitValueImpl(TargetExpr, 4, SMLoc(), false);
return 4;
}
Size = 4;
IsPCRel = true;
Delta += 4;
Expand All @@ -475,13 +509,19 @@ int ObjectWriter::EmitSymbolRef(const char *SymbolName,
return 4;
}
case RelocType::IMAGE_REL_BASED_ARM64_PAGEBASE_REL21: {
if (ObjFileInfo->getObjectFileType() == ObjFileInfo->IsMachO) {
Kind = MCSymbolRefExpr::VK_PAGE;
}
const MCExpr *TargetExpr = GenTargetExpr(Symbol, Kind, Delta);
TargetExpr =
AArch64MCExpr::create(TargetExpr, AArch64MCExpr::VK_CALL, *OutContext);
EmitRelocDirective(GetDFSize(), "R_AARCH64_ADR_PREL_PG_HI21", TargetExpr);
return 4;
}
case RelocType::IMAGE_REL_BASED_ARM64_PAGEOFFSET_12A: {
if (ObjFileInfo->getObjectFileType() == ObjFileInfo->IsMachO) {
Kind = MCSymbolRefExpr::VK_PAGEOFF;
}
const MCExpr *TargetExpr = GenTargetExpr(Symbol, Kind, Delta);
TargetExpr =
AArch64MCExpr::create(TargetExpr, AArch64MCExpr::VK_LO12, *OutContext);
Expand Down Expand Up @@ -560,8 +600,12 @@ void ObjectWriter::EmitCFILsda(const char *LsdaBlobSymbolName) {
// Create symbol reference
MCSymbol *T = OutContext->getOrCreateSymbol(LsdaBlobSymbolName);
Assembler->registerSymbol(*T);
Streamer->emitCFILsda(T, llvm::dwarf::Constants::DW_EH_PE_pcrel |
llvm::dwarf::Constants::DW_EH_PE_sdata4);
if (ObjFileInfo->getObjectFileType() == ObjFileInfo->IsMachO) {
Streamer->emitCFILsda(T, llvm::dwarf::Constants::DW_EH_PE_pcrel);
} else {
Streamer->emitCFILsda(T, llvm::dwarf::Constants::DW_EH_PE_pcrel |
llvm::dwarf::Constants::DW_EH_PE_sdata4);
}
}

void ObjectWriter::EmitCFICode(int Offset, const char *Blob) {
Expand Down