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/Support/MemoryRegion.h" 13 #include "mcld/Target/GOT.h" 14 #include "mcld/Target/PLT.h" 15 16 const uint8_t aarch64_plt0[] = { 17 0xf0, 0x7b, 0xbf, 0xa9, /* stp x16, x30, [sp, #-16]! */ 18 0x10, 0x00, 0x00, 0x90, /* adrp x16, (GOT+16) */ 19 0x11, 0x0A, 0x40, 0xf9, /* ldr x17, [x16, #PLT_GOT+0x10] */ 20 0x10, 0x42, 0x00, 0x91, /* add x16, x16,#PLT_GOT+0x10 */ 21 0x20, 0x02, 0x1f, 0xd6, /* br x17 */ 22 0x1f, 0x20, 0x03, 0xd5, /* nop */ 23 0x1f, 0x20, 0x03, 0xd5, /* nop */ 24 0x1f, 0x20, 0x03, 0xd5 /* nop */ 25 }; 26 27 const uint8_t aarch64_plt1[] = { 28 0x10, 0x00, 0x00, 0x90, /* adrp x16, PLTGOT + n * 8 */ 29 0x11, 0x02, 0x40, 0xf9, /* ldr x17, [x16, PLTGOT + n * 8] */ 30 0x10, 0x02, 0x00, 0x91, /* add x16, x16, :lo12:PLTGOT + n * 8 */ 31 0x20, 0x02, 0x1f, 0xd6 /* br x17. */ 32 }; 33 34 namespace mcld { 35 36 class AArch64GOT; 37 38 class AArch64PLT0 : public PLT::Entry<sizeof(aarch64_plt0)> { 39 public: 40 AArch64PLT0(SectionData& pParent); 41 }; 42 43 class AArch64PLT1 : public PLT::Entry<sizeof(aarch64_plt1)> { 44 public: 45 AArch64PLT1(SectionData& pParent); 46 }; 47 48 /** \class AArch64PLT 49 * \brief AArch64 Procedure Linkage Table 50 */ 51 class AArch64PLT : public PLT { 52 public: 53 AArch64PLT(LDSection& pSection, AArch64GOT& pGOTPLT); 54 ~AArch64PLT(); 55 56 // finalizeSectionSize - set LDSection size 57 void finalizeSectionSize(); 58 59 // hasPLT1 - return if this plt section has any plt1 entry 60 bool hasPLT1() const; 61 62 AArch64PLT1* create(); 63 64 AArch64PLT0* getPLT0() const; 65 66 void applyPLT0(); 67 68 void applyPLT1(); 69 70 uint64_t emit(MemoryRegion& pRegion); 71 72 private: 73 AArch64GOT& m_GOT; 74 }; 75 76 } // namespace mcld 77 78 #endif // TARGET_AARCH64_AARCH64PLT_H_ 79
