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//===- HexagonLDBackend.h -------------------------------------------------===//
//
// The MCLinker Project
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef HEXAGON_LDBACKEND_H
#define HEXAGON_LDBACKEND_H
#include "HexagonELFDynamic.h"
#include "HexagonGOT.h"
#include "HexagonPLT.h"
#include "HexagonGOTPLT.h"
#include <mcld/IRBuilder.h>
#include <mcld/LinkerConfig.h>
#include <mcld/LD/LDSection.h>
#include <mcld/Object/ObjectBuilder.h>
#include <mcld/Target/GNULDBackend.h>
#include <mcld/Target/OutputRelocSection.h>
namespace mcld {
class LinkerConfig;
class HexagonGNUInfo;
//===----------------------------------------------------------------------===//
/// HexagonLDBackend - linker backend of Hexagon target of GNU ELF format
///
class HexagonLDBackend : public GNULDBackend
{
public:
HexagonLDBackend(const LinkerConfig& pConfig, HexagonGNUInfo* pInfo);
~HexagonLDBackend();
uint32_t machine() const;
HexagonGOT& getGOT();
const HexagonGOT& getGOT() const;
HexagonPLT& getPLT();
const HexagonPLT& getPLT() const;
/// preLayout - Backend can do any needed modification before layout
void doPreLayout(IRBuilder& pBuilder);
bool allocateCommonSymbols(Module& pModule);
/// postLayout - Backend can do any needed modification after layout
void doPostLayout(Module& pModule, IRBuilder& pBuilder);
/// dynamic - the dynamic section of the target machine.
/// Use co-variant return type to return its own dynamic section.
HexagonELFDynamic& dynamic();
/// dynamic - the dynamic section of the target machine.
/// Use co-variant return type to return its own dynamic section.
const HexagonELFDynamic& dynamic() const;
/// emitSectionData - write out the section data into the memory region.
/// When writers get a LDSection whose kind is LDFileFormat::Target, writers
/// call back target backend to emit the data.
///
/// Backends handle the target-special tables (plt, gp,...) by themselves.
/// Backend can put the data of the tables in MCSectionData directly
/// - LDSection.getSectionData can get the section data.
/// Or, backend can put the data into special data structure
/// - backend can maintain its own map<LDSection, table> to get the table
/// from given LDSection.
///
/// @param pSection - the given LDSection
/// @param pLayout - for comouting the size of fragment
/// @param pRegion - the region to write out data
/// @return the size of the table in the file.
uint64_t emitSectionData(const LDSection& pSection,
MemoryRegion& pRegion) const;
/// initRelocator - create and initialize Relocator.
bool initRelocator();
/// getRelocator - return relocator.
Relocator* getRelocator();
ResolveInfo::Desc getSymDesc(uint16_t shndx) const
{
if (shndx >= llvm::ELF::SHN_HEXAGON_SCOMMON &&
shndx <= llvm::ELF::SHN_HEXAGON_SCOMMON_8)
return ResolveInfo::Common;
return ResolveInfo::NoneDesc;
}
void initTargetSections(Module& pModule, ObjectBuilder& pBuilder);
void initTargetSymbols(IRBuilder& pBuilder, Module& pModule);
bool initBRIslandFactory();
bool initStubFactory();
bool mayRelax() { return true; }
bool doRelax(Module& pModule, IRBuilder& pBuilder, bool& pFinished);
bool initTargetStubs();
OutputRelocSection& getRelaDyn();
const OutputRelocSection& getRelaDyn() const;
HexagonGOTPLT& getGOTPLT();
const HexagonGOTPLT& getGOTPLT() const;
OutputRelocSection& getRelaPLT();
const OutputRelocSection& getRelaPLT() const;
/// getTargetSectionOrder - compute the layout order of Hexagon target section
unsigned int getTargetSectionOrder(const LDSection& pSectHdr) const;
/// finalizeTargetSymbols - finalize the symbol value
bool finalizeTargetSymbols();
/// mergeSection - merge target dependent sections
bool mergeSection(Module& pModule, const Input& pInput, LDSection& pSection);
/// readSection - read target dependent sections
bool readSection(Input& pInput, SectionData& pSD);
bool MoveCommonData(SectionData &pFrom, SectionData &pTo);
bool MoveSectionDataAndSort(SectionData& pFrom, SectionData& pTo);
bool SetSDataSection();
uint32_t getGP() { return m_psdata->addr(); }
Relocation::Type getCopyRelType() const { return m_CopyRel; }
virtual uint32_t getGOTSymbolAddr() {
return m_pGOTSymbol->value();
}
protected:
void defineGOTSymbol(IRBuilder& pBuilder, Fragment&);
private:
/// getRelEntrySize - the size in BYTE of rela type relocation
size_t getRelEntrySize()
{ return 0; }
/// getRelaEntrySize - the size in BYTE of rela type relocation
size_t getRelaEntrySize()
{ return 12; }
/// doCreateProgramHdrs - backend can implement this function to create the
/// target-dependent segments
void doCreateProgramHdrs(Module& pModule);
uint64_t maxBranchOffset() { return ~(~0 << 6); }
virtual void setGOTSectionSize(IRBuilder& pBuilder);
virtual uint64_t emitGOTSectionData(MemoryRegion& pRegion) const;
virtual uint64_t emitGOTPLTSectionData(MemoryRegion& pRegion,
const ELFFileFormat* FileFormat) const;
virtual void setRelaDynSize();
virtual void setRelaPLTSize();
private:
Relocator* m_pRelocator;
HexagonGOT* m_pGOT;
HexagonGOTPLT* m_pGOTPLT;
HexagonPLT* m_pPLT;
/// m_RelaDyn - dynamic relocation table of .rela.dyn
OutputRelocSection* m_pRelaDyn;
/// m_RelaPLT - dynamic relocation table of .rela.plt
OutputRelocSection* m_pRelaPLT;
HexagonELFDynamic* m_pDynamic;
LDSection* m_psdata;
LDSection* m_pscommon_1;
LDSection* m_pscommon_2;
LDSection* m_pscommon_4;
LDSection* m_pscommon_8;
LDSection* m_pstart;
LDSymbol* m_psdabase;
LDSymbol* m_pGOTSymbol;
LDSymbol* m_pBSSEnd;
Relocation::Type m_CopyRel;
};
} // namespace of mcld
#endif
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