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97 lines
2.6 KiB
97 lines
2.6 KiB
//===- AArch64GOT.h -------------------------------------------------------===//
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//
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// The MCLinker Project
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef TARGET_AARCH64_AARCH64GOT_H_
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#define TARGET_AARCH64_AARCH64GOT_H_
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#include "mcld/Support/MemoryRegion.h"
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#include "mcld/Target/GOT.h"
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#include <llvm/ADT/DenseMap.h>
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#include <vector>
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namespace mcld {
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class LDSection;
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/** \class AArch64GOTEntry
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* \brief GOT Entry with size of 8 bytes
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*/
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class AArch64GOTEntry : public GOT::Entry<8> {
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public:
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AArch64GOTEntry(uint64_t pContent, SectionData* pParent)
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: GOT::Entry<8>(pContent, pParent) {}
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};
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/** \class AArch64GOT
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* \brief AArch64 Global Offset Table.
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*
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* AArch64 GOT integrates traditional .got.plt and .got sections into one.
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* Traditional .got.plt is placed in the front part of GOT (PLTGOT), and
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* traditional .got is placed in the rear part of GOT (GOT). When -z now and
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* -z relro are given, the got section layout will be as below. Otherwise,
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* there will be two seperated sections, .got and .got.plt.
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*
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* This class may be used as .got (with no GOTPLT entry), .got.plt (with only
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* GOTPLT entries) or .got (with GOTPLT and normal GOT entries)
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*
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* AArch64 .got
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* +--------------+
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* | GOT0 |
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* +--------------+
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* | GOTPLT |
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* +--------------+
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* | GOT |
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* +--------------+
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*
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*/
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class AArch64GOT : public GOT {
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public:
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explicit AArch64GOT(LDSection& pSection);
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~AArch64GOT();
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/// createGOT0 - create the defualt GOT0 entries. This function called when
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/// it's a .got section (with GOTPLT entries and normal GOT entry) or it's a
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/// .got.plt section
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void createGOT0();
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AArch64GOTEntry* createGOT();
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AArch64GOTEntry* createGOTPLT();
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void finalizeSectionSize();
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uint64_t emit(MemoryRegion& pRegion);
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void applyGOT0(uint64_t pAddress);
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void applyGOTPLT(uint64_t pPLTBase);
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bool hasGOT1() const;
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private:
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typedef std::vector<AArch64GOTEntry*> EntryListType;
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typedef EntryListType::iterator entry_iterator;
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typedef EntryListType::const_iterator const_entry_iterator;
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private:
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AArch64GOTEntry* m_pGOTPLTFront;
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AArch64GOTEntry* m_pGOTFront;
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/// m_GOTPLTEntries - a list of gotplt entries
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EntryListType m_GOTPLT;
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/// m_GOTEntris - a list of got entries
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EntryListType m_GOT;
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};
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} // namespace mcld
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#endif // TARGET_AARCH64_AARCH64GOT_H_
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