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      1 //===- ARMGOT.h -----------------------------------------------------------===//
      2 //
      3 //                     The MCLinker Project
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 #ifndef TARGET_ARM_ARMGOT_H_
     10 #define TARGET_ARM_ARMGOT_H_
     11 
     12 #include "mcld/Support/MemoryRegion.h"
     13 #include "mcld/Target/GOT.h"
     14 #include <llvm/ADT/DenseMap.h>
     15 #include <vector>
     16 
     17 namespace mcld {
     18 
     19 class LDSection;
     20 
     21 /** \class ARMGOTEntry
     22  *  \brief GOT Entry with size of 4 bytes
     23  */
     24 class ARMGOTEntry : public GOT::Entry<4> {
     25  public:
     26   ARMGOTEntry(uint64_t pContent, SectionData* pParent)
     27       : GOT::Entry<4>(pContent, pParent) {}
     28 };
     29 
     30 /** \class ARMGOT
     31  *  \brief ARM Global Offset Table.
     32  *
     33  *  ARM GOT integrates traditional .got.plt and .got sections into one.
     34  *  Traditional .got.plt is placed in the front part of GOT (PLTGOT), and
     35  *  traditional .got is placed in the rear part of GOT (GOT).
     36  *
     37  *  ARM .got
     38  *            +--------------+
     39  *            |    GOT0      |
     40  *            +--------------+
     41  *            |    GOTPLT    |
     42  *            +--------------+
     43  *            |    GOT       |
     44  *            +--------------+
     45  *
     46  */
     47 class ARMGOT : public GOT {
     48  public:
     49   explicit ARMGOT(LDSection& pSection);
     50 
     51   ~ARMGOT();
     52 
     53   ARMGOTEntry* createGOT();
     54   ARMGOTEntry* createGOTPLT();
     55 
     56   void finalizeSectionSize();
     57 
     58   uint64_t emit(MemoryRegion& pRegion);
     59 
     60   void applyGOT0(uint64_t pAddress);
     61 
     62   void applyGOTPLT(uint64_t pPLTBase);
     63 
     64   bool hasGOT1() const;
     65 
     66  private:
     67   typedef std::vector<ARMGOTEntry*> EntryListType;
     68   typedef EntryListType::iterator entry_iterator;
     69   typedef EntryListType::const_iterator const_entry_iterator;
     70 
     71  private:
     72   ARMGOTEntry* m_pGOTPLTFront;
     73   ARMGOTEntry* m_pGOTFront;
     74 
     75   /// m_GOTPLTEntries - a list of gotplt entries
     76   EntryListType m_GOTPLT;
     77 
     78   /// m_GOTEntris - a list of got entries
     79   EntryListType m_GOT;
     80 };
     81 
     82 }  // namespace mcld
     83 
     84 #endif  // TARGET_ARM_ARMGOT_H_
     85