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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 LLD_READER_WRITER_ELF_HEXAGON_TARGET_HANDLER_H
#define LLD_READER_WRITER_ELF_HEXAGON_TARGET_HANDLER_H
#include "DefaultTargetHandler.h"
#include "ExecutableAtoms.h"
#include "HexagonRelocationHandler.h"
#include "HexagonSectionChunks.h"
#include "TargetLayout.h"
namespace lld {
namespace elf {
typedef llvm::object::ELFType<llvm::support::little, 4, false> HexagonELFType;
class HexagonTargetInfo;
/// \brief Handle Hexagon specific Atoms
template <class HexagonELFType>
class HexagonTargetAtomHandler LLVM_FINAL :
public TargetAtomHandler<HexagonELFType> {
typedef llvm::object::Elf_Sym_Impl<HexagonELFType> Elf_Sym;
typedef llvm::object::Elf_Shdr_Impl<HexagonELFType> Elf_Shdr;
public:
virtual DefinedAtom::ContentType
contentType(const ELFDefinedAtom<HexagonELFType> *atom) const {
return contentType(atom->section(), atom->symbol());
}
virtual DefinedAtom::ContentType
contentType(const Elf_Shdr *section, const Elf_Sym *sym) const {
switch (sym->st_shndx) {
// Common symbols
case llvm::ELF::SHN_HEXAGON_SCOMMON:
case llvm::ELF::SHN_HEXAGON_SCOMMON_1:
case llvm::ELF::SHN_HEXAGON_SCOMMON_2:
case llvm::ELF::SHN_HEXAGON_SCOMMON_4:
case llvm::ELF::SHN_HEXAGON_SCOMMON_8:
return DefinedAtom::typeZeroFill;
default:
if (section->sh_flags & llvm::ELF::SHF_HEX_GPREL)
return DefinedAtom::typeDataFast;
else
llvm_unreachable("unknown symbol type");
}
}
virtual DefinedAtom::ContentPermissions
contentPermissions(const ELFDefinedAtom<HexagonELFType> *atom) const {
// All of the hexagon specific symbols belong in the data segment
return DefinedAtom::permRW_;
}
virtual int64_t getType(const Elf_Sym *sym) const {
switch (sym->st_shndx) {
// Common symbols
case llvm::ELF::SHN_HEXAGON_SCOMMON:
case llvm::ELF::SHN_HEXAGON_SCOMMON_1:
case llvm::ELF::SHN_HEXAGON_SCOMMON_2:
case llvm::ELF::SHN_HEXAGON_SCOMMON_4:
case llvm::ELF::SHN_HEXAGON_SCOMMON_8:
return llvm::ELF::STT_COMMON;
default:
return sym->getType();
}
}
};
/// \brief TargetLayout for Hexagon
template <class HexagonELFType>
class HexagonTargetLayout LLVM_FINAL : public TargetLayout<HexagonELFType> {
public:
enum HexagonSectionOrder {
ORDER_SDATA = 205
};
HexagonTargetLayout(const HexagonTargetInfo &hti)
: TargetLayout<HexagonELFType>(hti), _sdataSection(nullptr) {
_sdataSection = new (_alloc) SDataSection<HexagonELFType>(hti);
}
/// \brief Return the section order for a input section
virtual Layout::SectionOrder getSectionOrder(
StringRef name, int32_t contentType, int32_t contentPermissions) {
if (contentType == DefinedAtom::typeDataFast)
return ORDER_SDATA;
return DefaultLayout<HexagonELFType>::getSectionOrder(name, contentType,
contentPermissions);
}
/// \brief This maps the input sections to the output section names
virtual StringRef getSectionName(StringRef name, const int32_t contentType,
const int32_t contentPermissions) {
if (contentType == DefinedAtom::typeDataFast)
return ".sdata";
return DefaultLayout<HexagonELFType>::getSectionName(name, contentType,
contentPermissions);
}
/// \brief Gets or creates a section.
virtual AtomSection<HexagonELFType> *
createSection(StringRef name, int32_t contentType,
DefinedAtom::ContentPermissions contentPermissions,
Layout::SectionOrder sectionOrder) {
if (contentType == DefinedAtom::typeDataFast)
return _sdataSection;
return DefaultLayout<HexagonELFType>::createSection(
name, contentType, contentPermissions, sectionOrder);
}
/// \brief get the segment type for the section thats defined by the target
virtual Layout::SegmentType
getSegmentType(Section<HexagonELFType> *section) const {
if (section->order() == ORDER_SDATA)
return PT_LOAD;
return DefaultLayout<HexagonELFType>::getSegmentType(section);
}
private:
llvm::BumpPtrAllocator _alloc;
SDataSection<HexagonELFType> *_sdataSection;
};
/// \brief TargetHandler for Hexagon
class HexagonTargetHandler LLVM_FINAL :
public DefaultTargetHandler<HexagonELFType> {
public:
HexagonTargetHandler(HexagonTargetInfo &targetInfo);
virtual TargetLayout<HexagonELFType> &targetLayout() {
return _targetLayout;
}
virtual TargetAtomHandler<HexagonELFType> &targetAtomHandler() {
return _targetAtomHandler;
}
virtual const HexagonTargetRelocationHandler &getRelocationHandler() const {
return _relocationHandler;
}
private:
HexagonTargetRelocationHandler _relocationHandler;
HexagonTargetLayout<HexagonELFType> _targetLayout;
HexagonTargetAtomHandler<HexagonELFType> _targetAtomHandler;
};
} // end namespace elf
} // end namespace lld
#endif
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