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//===-- XCoreTargetObjectFile.cpp - XCore object files --------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "XCoreTargetObjectFile.h"
#include "XCoreSubtarget.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
void XCoreTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM){
TargetLoweringObjectFileELF::Initialize(Ctx, TM);
BSSSection = Ctx.getELFSection(".dp.bss", ELF::SHT_NOBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE |
ELF::XCORE_SHF_DP_SECTION);
BSSSectionLarge = Ctx.getELFSection(".dp.bss.large", ELF::SHT_NOBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE |
ELF::XCORE_SHF_DP_SECTION);
DataSection = Ctx.getELFSection(".dp.data", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE |
ELF::XCORE_SHF_DP_SECTION);
DataSectionLarge = Ctx.getELFSection(".dp.data.large", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE |
ELF::XCORE_SHF_DP_SECTION);
DataRelROSection = Ctx.getELFSection(".dp.rodata", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE |
ELF::XCORE_SHF_DP_SECTION);
DataRelROSectionLarge = Ctx.getELFSection(
".dp.rodata.large", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE | ELF::XCORE_SHF_DP_SECTION);
ReadOnlySection =
Ctx.getELFSection(".cp.rodata", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::XCORE_SHF_CP_SECTION);
ReadOnlySectionLarge =
Ctx.getELFSection(".cp.rodata.large", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::XCORE_SHF_CP_SECTION);
MergeableConst4Section = Ctx.getELFSection(
".cp.rodata.cst4", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::XCORE_SHF_CP_SECTION, 4);
MergeableConst8Section = Ctx.getELFSection(
".cp.rodata.cst8", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::XCORE_SHF_CP_SECTION, 8);
MergeableConst16Section = Ctx.getELFSection(
".cp.rodata.cst16", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::XCORE_SHF_CP_SECTION, 16);
CStringSection =
Ctx.getELFSection(".cp.rodata.string", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS |
ELF::XCORE_SHF_CP_SECTION);
// TextSection - see MObjectFileInfo.cpp
// StaticCtorSection - see MObjectFileInfo.cpp
// StaticDtorSection - see MObjectFileInfo.cpp
}
static unsigned getXCoreSectionType(SectionKind K) {
if (K.isBSS())
return ELF::SHT_NOBITS;
return ELF::SHT_PROGBITS;
}
static unsigned getXCoreSectionFlags(SectionKind K, bool IsCPRel) {
unsigned Flags = 0;
if (!K.isMetadata())
Flags |= ELF::SHF_ALLOC;
if (K.isText())
Flags |= ELF::SHF_EXECINSTR;
else if (IsCPRel)
Flags |= ELF::XCORE_SHF_CP_SECTION;
else
Flags |= ELF::XCORE_SHF_DP_SECTION;
if (K.isWriteable())
Flags |= ELF::SHF_WRITE;
if (K.isMergeableCString() || K.isMergeableConst4() ||
K.isMergeableConst8() || K.isMergeableConst16())
Flags |= ELF::SHF_MERGE;
if (K.isMergeableCString())
Flags |= ELF::SHF_STRINGS;
return Flags;
}
MCSection *XCoreTargetObjectFile::getExplicitSectionGlobal(
const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
StringRef SectionName = GO->getSection();
// Infer section flags from the section name if we can.
bool IsCPRel = SectionName.startswith(".cp.");
if (IsCPRel && !Kind.isReadOnly())
report_fatal_error("Using .cp. section for writeable object.");
return getContext().getELFSection(SectionName, getXCoreSectionType(Kind),
getXCoreSectionFlags(Kind, IsCPRel));
}
MCSection *XCoreTargetObjectFile::SelectSectionForGlobal(
const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
bool UseCPRel = GO->hasLocalLinkage();
if (Kind.isText()) return TextSection;
if (UseCPRel) {
if (Kind.isMergeable1ByteCString()) return CStringSection;
if (Kind.isMergeableConst4()) return MergeableConst4Section;
if (Kind.isMergeableConst8()) return MergeableConst8Section;
if (Kind.isMergeableConst16()) return MergeableConst16Section;
}
Type *ObjType = GO->getValueType();
auto &DL = GO->getParent()->getDataLayout();
if (TM.getCodeModel() == CodeModel::Small || !ObjType->isSized() ||
DL.getTypeAllocSize(ObjType) < CodeModelLargeSize) {
if (Kind.isReadOnly()) return UseCPRel? ReadOnlySection
: DataRelROSection;
if (Kind.isBSS() || Kind.isCommon())return BSSSection;
if (Kind.isData())
return DataSection;
if (Kind.isReadOnlyWithRel()) return DataRelROSection;
} else {
if (Kind.isReadOnly()) return UseCPRel? ReadOnlySectionLarge
: DataRelROSectionLarge;
if (Kind.isBSS() || Kind.isCommon())return BSSSectionLarge;
if (Kind.isData())
return DataSectionLarge;
if (Kind.isReadOnlyWithRel()) return DataRelROSectionLarge;
}
assert((Kind.isThreadLocal() || Kind.isCommon()) && "Unknown section kind");
report_fatal_error("Target does not support TLS or Common sections");
}
MCSection *XCoreTargetObjectFile::getSectionForConstant(
const DataLayout &DL, SectionKind Kind, const Constant *C,
Align &Alignment) const {
if (Kind.isMergeableConst4()) return MergeableConst4Section;
if (Kind.isMergeableConst8()) return MergeableConst8Section;
if (Kind.isMergeableConst16()) return MergeableConst16Section;
assert((Kind.isReadOnly() || Kind.isReadOnlyWithRel()) &&
"Unknown section kind");
// We assume the size of the object is never greater than CodeModelLargeSize.
// To handle CodeModelLargeSize changes to AsmPrinter would be required.
return ReadOnlySection;
}
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