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      1 //===- AArch64PLT.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_AARCH64_AARCH64PLT_H
     10 #define TARGET_AARCH64_AARCH64PLT_H
     11 
     12 #include <mcld/Target/GOT.h>
     13 #include <mcld/Target/PLT.h>
     14 #include <mcld/Support/MemoryRegion.h>
     15 
     16 namespace {
     17 
     18 const uint8_t aarch64_plt0[] = {
     19   0xf0, 0x7b, 0xbf, 0xa9,  /* stp x16, x30, [sp, #-16]!  */
     20   0x10, 0x00, 0x00, 0x90,  /* adrp x16, (GOT+16)  */
     21   0x11, 0x0A, 0x40, 0xf9,  /* ldr x17, [x16, #PLT_GOT+0x10]  */
     22   0x10, 0x42, 0x00, 0x91,  /* add x16, x16,#PLT_GOT+0x10   */
     23   0x20, 0x02, 0x1f, 0xd6,  /* br x17  */
     24   0x1f, 0x20, 0x03, 0xd5,  /* nop */
     25   0x1f, 0x20, 0x03, 0xd5,  /* nop */
     26   0x1f, 0x20, 0x03, 0xd5   /* nop */
     27 };
     28 
     29 const uint8_t aarch64_plt1[] = {
     30   0x10, 0x00, 0x00, 0x90,  /* adrp x16, PLTGOT + n * 8  */
     31   0x11, 0x02, 0x40, 0xf9,  /* ldr x17, [x16, PLTGOT + n * 8] */
     32   0x10, 0x02, 0x00, 0x91,  /* add x16, x16, :lo12:PLTGOT + n * 8  */
     33   0x20, 0x02, 0x1f, 0xd6   /* br x17.  */
     34 };
     35 
     36 } // anonymous namespace
     37 
     38 namespace mcld {
     39 
     40 class AArch64GOT;
     41 
     42 class AArch64PLT0 : public PLT::Entry<sizeof(aarch64_plt0)>
     43 {
     44 public:
     45   AArch64PLT0(SectionData& pParent);
     46 };
     47 
     48 class AArch64PLT1 : public PLT::Entry<sizeof(aarch64_plt1)>
     49 {
     50 public:
     51   AArch64PLT1(SectionData& pParent);
     52 };
     53 
     54 /** \class AArch64PLT
     55  *  \brief AArch64 Procedure Linkage Table
     56  */
     57 class AArch64PLT : public PLT
     58 {
     59 public:
     60   AArch64PLT(LDSection& pSection, AArch64GOT& pGOTPLT);
     61   ~AArch64PLT();
     62 
     63   // finalizeSectionSize - set LDSection size
     64   void finalizeSectionSize();
     65 
     66   // hasPLT1 - return if this plt section has any plt1 entry
     67   bool hasPLT1() const;
     68 
     69   AArch64PLT1* create();
     70 
     71   AArch64PLT0* getPLT0() const;
     72 
     73   void applyPLT0();
     74 
     75   void applyPLT1();
     76 
     77   uint64_t emit(MemoryRegion& pRegion);
     78 
     79 private:
     80   AArch64GOT& m_GOT;
     81 };
     82 
     83 } // namespace of mcld
     84 
     85 #endif
     86 
     87