1 //===-- llvm/Target/TargetELFWriterInfo.h - ELF Writer Info -----*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file defines the TargetELFWriterInfo class. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_TARGET_TARGETELFWRITERINFO_H 15 #define LLVM_TARGET_TARGETELFWRITERINFO_H 16 17 namespace llvm { 18 19 //===--------------------------------------------------------------------===// 20 // TargetELFWriterInfo 21 //===--------------------------------------------------------------------===// 22 23 class TargetELFWriterInfo { 24 protected: 25 // EMachine - This field is the target specific value to emit as the 26 // e_machine member of the ELF header. 27 unsigned short EMachine; 28 bool is64Bit, isLittleEndian; 29 public: 30 31 // Machine architectures 32 enum MachineType { 33 EM_NONE = 0, // No machine 34 EM_M32 = 1, // AT&T WE 32100 35 EM_SPARC = 2, // SPARC 36 EM_386 = 3, // Intel 386 37 EM_68K = 4, // Motorola 68000 38 EM_88K = 5, // Motorola 88000 39 EM_486 = 6, // Intel 486 (deprecated) 40 EM_860 = 7, // Intel 80860 41 EM_MIPS = 8, // MIPS R3000 42 EM_PPC = 20, // PowerPC 43 EM_ARM = 40, // ARM 44 EM_ALPHA = 41, // DEC Alpha 45 EM_SPARCV9 = 43, // SPARC V9 46 EM_X86_64 = 62, // AMD64 47 EM_HEXAGON = 164 // Qualcomm Hexagon 48 }; 49 50 // ELF File classes 51 enum { 52 ELFCLASS32 = 1, // 32-bit object file 53 ELFCLASS64 = 2 // 64-bit object file 54 }; 55 56 // ELF Endianess 57 enum { 58 ELFDATA2LSB = 1, // Little-endian object file 59 ELFDATA2MSB = 2 // Big-endian object file 60 }; 61 62 explicit TargetELFWriterInfo(bool is64Bit_, bool isLittleEndian_); 63 virtual ~TargetELFWriterInfo(); 64 getEMachine()65 unsigned short getEMachine() const { return EMachine; } getEFlags()66 unsigned getEFlags() const { return 0; } getEIClass()67 unsigned getEIClass() const { return is64Bit ? ELFCLASS64 : ELFCLASS32; } getEIData()68 unsigned getEIData() const { 69 return isLittleEndian ? ELFDATA2LSB : ELFDATA2MSB; 70 } 71 72 /// ELF Header and ELF Section Header Info getHdrSize()73 unsigned getHdrSize() const { return is64Bit ? 64 : 52; } getSHdrSize()74 unsigned getSHdrSize() const { return is64Bit ? 64 : 40; } 75 76 /// Symbol Table Info getSymTabEntrySize()77 unsigned getSymTabEntrySize() const { return is64Bit ? 24 : 16; } 78 79 /// getPrefELFAlignment - Returns the preferred alignment for ELF. This 80 /// is used to align some sections. getPrefELFAlignment()81 unsigned getPrefELFAlignment() const { return is64Bit ? 8 : 4; } 82 83 /// getRelocationEntrySize - Entry size used in the relocation section getRelocationEntrySize()84 unsigned getRelocationEntrySize() const { 85 return is64Bit ? (hasRelocationAddend() ? 24 : 16) 86 : (hasRelocationAddend() ? 12 : 8); 87 } 88 89 /// getRelocationType - Returns the target specific ELF Relocation type. 90 /// 'MachineRelTy' contains the object code independent relocation type 91 virtual unsigned getRelocationType(unsigned MachineRelTy) const = 0; 92 93 /// hasRelocationAddend - True if the target uses an addend in the 94 /// ELF relocation entry. 95 virtual bool hasRelocationAddend() const = 0; 96 97 /// getDefaultAddendForRelTy - Gets the default addend value for a 98 /// relocation entry based on the target ELF relocation type. 99 virtual long int getDefaultAddendForRelTy(unsigned RelTy, 100 long int Modifier = 0) const = 0; 101 102 /// getRelTySize - Returns the size of relocatable field in bits 103 virtual unsigned getRelocationTySize(unsigned RelTy) const = 0; 104 105 /// isPCRelativeRel - True if the relocation type is pc relative 106 virtual bool isPCRelativeRel(unsigned RelTy) const = 0; 107 108 /// getJumpTableRelocationTy - Returns the machine relocation type used 109 /// to reference a jumptable. 110 virtual unsigned getAbsoluteLabelMachineRelTy() const = 0; 111 112 /// computeRelocation - Some relocatable fields could be relocated 113 /// directly, avoiding the relocation symbol emission, compute the 114 /// final relocation value for this symbol. 115 virtual long int computeRelocation(unsigned SymOffset, unsigned RelOffset, 116 unsigned RelTy) const = 0; 117 }; 118 119 } // end llvm namespace 120 121 #endif // LLVM_TARGET_TARGETELFWRITERINFO_H 122