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//===- lib/ReaderWriter/ELF/Hexagon/HexagonTargetHandler.h ----------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef HEXAGON_TARGET_HANDLER_H
#define HEXAGON_TARGET_HANDLER_H
#include "DefaultTargetHandler.h"
#include "HexagonELFReader.h"
#include "HexagonExecutableAtoms.h"
#include "HexagonRelocationHandler.h"
#include "HexagonSectionChunks.h"
#include "TargetLayout.h"
namespace lld {
namespace elf {
class HexagonLinkingContext;
/// \brief TargetLayout for Hexagon
template <class HexagonELFType>
class HexagonTargetLayout final : public TargetLayout<HexagonELFType> {
public:
enum HexagonSectionOrder {
ORDER_SDATA = 205
};
HexagonTargetLayout(HexagonLinkingContext &hti)
: TargetLayout<HexagonELFType>(hti), _sdataSection(nullptr),
_gotSymAtom(nullptr), _cachedGotSymAtom(false) {
_sdataSection = new (_alloc) SDataSection<HexagonELFType>(hti);
}
/// \brief Return the section order for a input section
Layout::SectionOrder getSectionOrder(
StringRef name, int32_t contentType, int32_t contentPermissions) override {
if ((contentType == DefinedAtom::typeDataFast) ||
(contentType == DefinedAtom::typeZeroFillFast))
return ORDER_SDATA;
return DefaultLayout<HexagonELFType>::getSectionOrder(name, contentType,
contentPermissions);
}
/// \brief Return the appropriate input section name.
StringRef getInputSectionName(const DefinedAtom *da) const override {
switch (da->contentType()) {
case DefinedAtom::typeDataFast:
case DefinedAtom::typeZeroFillFast:
return ".sdata";
default:
break;
}
return DefaultLayout<HexagonELFType>::getInputSectionName(da);
}
/// \brief Gets or creates a section.
AtomSection<HexagonELFType> *
createSection(StringRef name, int32_t contentType,
DefinedAtom::ContentPermissions contentPermissions,
Layout::SectionOrder sectionOrder) override {
if ((contentType == DefinedAtom::typeDataFast) ||
(contentType == DefinedAtom::typeZeroFillFast))
return _sdataSection;
return DefaultLayout<HexagonELFType>::createSection(
name, contentType, contentPermissions, sectionOrder);
}
/// \brief get the segment type for the section thats defined by the target
Layout::SegmentType
getSegmentType(Section<HexagonELFType> *section) const override {
if (section->order() == ORDER_SDATA)
return PT_LOAD;
return DefaultLayout<HexagonELFType>::getSegmentType(section);
}
Section<HexagonELFType> *getSDataSection() const {
return _sdataSection;
}
uint64_t getGOTSymAddr() {
if (!_cachedGotSymAtom) {
auto gotAtomIter = this->findAbsoluteAtom("_GLOBAL_OFFSET_TABLE_");
_gotSymAtom = (*gotAtomIter);
_cachedGotSymAtom = true;
}
if (_gotSymAtom)
return _gotSymAtom->_virtualAddr;
return 0;
}
private:
llvm::BumpPtrAllocator _alloc;
SDataSection<HexagonELFType> *_sdataSection;
AtomLayout *_gotSymAtom;
bool _cachedGotSymAtom;
};
/// \brief TargetHandler for Hexagon
class HexagonTargetHandler final :
public DefaultTargetHandler<HexagonELFType> {
public:
HexagonTargetHandler(HexagonLinkingContext &targetInfo);
void registerRelocationNames(Registry ®istry) override;
const HexagonTargetRelocationHandler &getRelocationHandler() const override {
return *_relocationHandler;
}
std::unique_ptr<Reader> getObjReader() override {
return llvm::make_unique<HexagonELFObjectReader>(_ctx);
}
std::unique_ptr<Reader> getDSOReader() override {
return llvm::make_unique<HexagonELFDSOReader>(_ctx);
}
std::unique_ptr<Writer> getWriter() override;
private:
llvm::BumpPtrAllocator _alloc;
static const Registry::KindStrings kindStrings[];
HexagonLinkingContext &_ctx;
std::unique_ptr<HexagonRuntimeFile<HexagonELFType>> _runtimeFile;
std::unique_ptr<HexagonTargetLayout<HexagonELFType>> _targetLayout;
std::unique_ptr<HexagonTargetRelocationHandler> _relocationHandler;
};
template <class ELFT>
void finalizeHexagonRuntimeAtomValues(HexagonTargetLayout<ELFT> &layout) {
auto gotAtomIter = layout.findAbsoluteAtom("_GLOBAL_OFFSET_TABLE_");
auto gotpltSection = layout.findOutputSection(".got.plt");
if (gotpltSection)
(*gotAtomIter)->_virtualAddr = gotpltSection->virtualAddr();
else
(*gotAtomIter)->_virtualAddr = 0;
auto dynamicAtomIter = layout.findAbsoluteAtom("_DYNAMIC");
auto dynamicSection = layout.findOutputSection(".dynamic");
if (dynamicSection)
(*dynamicAtomIter)->_virtualAddr = dynamicSection->virtualAddr();
else
(*dynamicAtomIter)->_virtualAddr = 0;
}
} // end namespace elf
} // end namespace lld
#endif
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