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1 //===-- RuntimeDyldMachO.cpp - Run-time dynamic linker for MC-JIT -*- C++ -*-=//
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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2 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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3 // The LLVM Compiler Infrastructure
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // Implementation of the MC-JIT runtime dynamic linker.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "RuntimeDyldMachO.h"
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83
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15 #include "Targets/RuntimeDyldMachOAArch64.h"
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16 #include "Targets/RuntimeDyldMachOARM.h"
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17 #include "Targets/RuntimeDyldMachOI386.h"
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18 #include "Targets/RuntimeDyldMachOX86_64.h"
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19 #include "llvm/ADT/STLExtras.h"
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20 #include "llvm/ADT/StringRef.h"
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77
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21
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22 using namespace llvm;
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23 using namespace llvm::object;
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24
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77
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25 #define DEBUG_TYPE "dyld"
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26
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27 namespace {
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28
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95
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29 class LoadedMachOObjectInfo final
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30 : public RuntimeDyld::LoadedObjectInfoHelper<LoadedMachOObjectInfo> {
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83
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31 public:
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32 LoadedMachOObjectInfo(RuntimeDyldImpl &RTDyld,
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33 ObjSectionToIDMap ObjSecToIDMap)
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34 : LoadedObjectInfoHelper(RTDyld, std::move(ObjSecToIDMap)) {}
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83
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35
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36 OwningBinary<ObjectFile>
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37 getObjectForDebug(const ObjectFile &Obj) const override {
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38 return OwningBinary<ObjectFile>();
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39 }
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40 };
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41
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42 }
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43
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44 namespace llvm {
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45
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77
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46 int64_t RuntimeDyldMachO::memcpyAddend(const RelocationEntry &RE) const {
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47 unsigned NumBytes = 1 << RE.Size;
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100
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48 uint8_t *Src = Sections[RE.SectionID].getAddress() + RE.Offset;
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49
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50 return static_cast<int64_t>(readBytesUnaligned(Src, NumBytes));
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51 }
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52
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120
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53 Expected<relocation_iterator>
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54 RuntimeDyldMachO::processScatteredVANILLA(
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95
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55 unsigned SectionID, relocation_iterator RelI,
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56 const ObjectFile &BaseObjT,
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57 RuntimeDyldMachO::ObjSectionToIDMap &ObjSectionToID) {
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58 const MachOObjectFile &Obj =
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59 static_cast<const MachOObjectFile&>(BaseObjT);
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60 MachO::any_relocation_info RE =
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61 Obj.getRelocation(RelI->getRawDataRefImpl());
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62
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63 SectionEntry &Section = Sections[SectionID];
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64 uint32_t RelocType = Obj.getAnyRelocationType(RE);
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65 bool IsPCRel = Obj.getAnyRelocationPCRel(RE);
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66 unsigned Size = Obj.getAnyRelocationLength(RE);
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67 uint64_t Offset = RelI->getOffset();
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100
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68 uint8_t *LocalAddress = Section.getAddressWithOffset(Offset);
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69 unsigned NumBytes = 1 << Size;
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70 int64_t Addend = readBytesUnaligned(LocalAddress, NumBytes);
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71
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72 unsigned SymbolBaseAddr = Obj.getScatteredRelocationValue(RE);
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73 section_iterator TargetSI = getSectionByAddress(Obj, SymbolBaseAddr);
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74 assert(TargetSI != Obj.section_end() && "Can't find section for symbol");
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75 uint64_t SectionBaseAddr = TargetSI->getAddress();
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76 SectionRef TargetSection = *TargetSI;
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77 bool IsCode = TargetSection.isText();
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120
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78 uint32_t TargetSectionID = ~0U;
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79 if (auto TargetSectionIDOrErr =
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80 findOrEmitSection(Obj, TargetSection, IsCode, ObjSectionToID))
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81 TargetSectionID = *TargetSectionIDOrErr;
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82 else
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83 return TargetSectionIDOrErr.takeError();
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95
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84
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85 Addend -= SectionBaseAddr;
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86 RelocationEntry R(SectionID, Offset, RelocType, Addend, IsPCRel, Size);
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87
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88 addRelocationForSection(R, TargetSectionID);
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89
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90 return ++RelI;
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91 }
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92
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93
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120
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94 Expected<RelocationValueRef>
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95 RuntimeDyldMachO::getRelocationValueRef(
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96 const ObjectFile &BaseTObj, const relocation_iterator &RI,
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97 const RelocationEntry &RE, ObjSectionToIDMap &ObjSectionToID) {
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77
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98
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99 const MachOObjectFile &Obj =
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100 static_cast<const MachOObjectFile &>(BaseTObj);
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77
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101 MachO::any_relocation_info RelInfo =
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102 Obj.getRelocation(RI->getRawDataRefImpl());
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103 RelocationValueRef Value;
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104
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105 bool IsExternal = Obj.getPlainRelocationExternal(RelInfo);
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106 if (IsExternal) {
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107 symbol_iterator Symbol = RI->getSymbol();
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120
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108 StringRef TargetName;
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109 if (auto TargetNameOrErr = Symbol->getName())
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110 TargetName = *TargetNameOrErr;
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111 else
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112 return TargetNameOrErr.takeError();
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83
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113 RTDyldSymbolTable::const_iterator SI =
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114 GlobalSymbolTable.find(TargetName.data());
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115 if (SI != GlobalSymbolTable.end()) {
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116 const auto &SymInfo = SI->second;
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117 Value.SectionID = SymInfo.getSectionID();
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118 Value.Offset = SymInfo.getOffset() + RE.Addend;
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77
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119 } else {
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83
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120 Value.SymbolName = TargetName.data();
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121 Value.Offset = RE.Addend;
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77
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122 }
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123 } else {
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95
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124 SectionRef Sec = Obj.getAnyRelocationSection(RelInfo);
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83
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125 bool IsCode = Sec.isText();
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120
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126 if (auto SectionIDOrErr = findOrEmitSection(Obj, Sec, IsCode,
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127 ObjSectionToID))
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128 Value.SectionID = *SectionIDOrErr;
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129 else
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130 return SectionIDOrErr.takeError();
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83
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131 uint64_t Addr = Sec.getAddress();
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132 Value.Offset = RE.Addend - Addr;
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133 }
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134
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135 return Value;
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136 }
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137
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138 void RuntimeDyldMachO::makeValueAddendPCRel(RelocationValueRef &Value,
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139 const relocation_iterator &RI,
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140 unsigned OffsetToNextPC) {
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141 auto &O = *cast<MachOObjectFile>(RI->getObject());
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142 section_iterator SecI = O.getRelocationRelocatedSection(RI);
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143 Value.Offset += RI->getOffset() + OffsetToNextPC + SecI->getAddress();
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144 }
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145
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146 void RuntimeDyldMachO::dumpRelocationToResolve(const RelocationEntry &RE,
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147 uint64_t Value) const {
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148 const SectionEntry &Section = Sections[RE.SectionID];
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100
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149 uint8_t *LocalAddress = Section.getAddress() + RE.Offset;
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150 uint64_t FinalAddress = Section.getLoadAddress() + RE.Offset;
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151
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152 dbgs() << "resolveRelocation Section: " << RE.SectionID
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153 << " LocalAddress: " << format("%p", LocalAddress)
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154 << " FinalAddress: " << format("0x%016" PRIx64, FinalAddress)
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155 << " Value: " << format("0x%016" PRIx64, Value) << " Addend: " << RE.Addend
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156 << " isPCRel: " << RE.IsPCRel << " MachoType: " << RE.RelType
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157 << " Size: " << (1 << RE.Size) << "\n";
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158 }
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159
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160 section_iterator
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161 RuntimeDyldMachO::getSectionByAddress(const MachOObjectFile &Obj,
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162 uint64_t Addr) {
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163 section_iterator SI = Obj.section_begin();
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164 section_iterator SE = Obj.section_end();
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165
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166 for (; SI != SE; ++SI) {
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167 uint64_t SAddr = SI->getAddress();
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168 uint64_t SSize = SI->getSize();
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169 if ((Addr >= SAddr) && (Addr < SAddr + SSize))
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170 return SI;
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171 }
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172
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173 return SE;
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77
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174 }
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175
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83
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176
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177 // Populate __pointers section.
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120
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178 Error RuntimeDyldMachO::populateIndirectSymbolPointersSection(
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179 const MachOObjectFile &Obj,
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180 const SectionRef &PTSection,
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181 unsigned PTSectionID) {
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182 assert(!Obj.is64Bit() &&
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183 "Pointer table section not supported in 64-bit MachO.");
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184
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185 MachO::dysymtab_command DySymTabCmd = Obj.getDysymtabLoadCommand();
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186 MachO::section Sec32 = Obj.getSection(PTSection.getRawDataRefImpl());
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187 uint32_t PTSectionSize = Sec32.size;
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188 unsigned FirstIndirectSymbol = Sec32.reserved1;
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189 const unsigned PTEntrySize = 4;
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190 unsigned NumPTEntries = PTSectionSize / PTEntrySize;
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191 unsigned PTEntryOffset = 0;
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192
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193 assert((PTSectionSize % PTEntrySize) == 0 &&
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194 "Pointers section does not contain a whole number of stubs?");
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195
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196 DEBUG(dbgs() << "Populating pointer table section "
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100
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197 << Sections[PTSectionID].getName() << ", Section ID "
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198 << PTSectionID << ", " << NumPTEntries << " entries, "
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199 << PTEntrySize << " bytes each:\n");
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83
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200
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201 for (unsigned i = 0; i < NumPTEntries; ++i) {
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202 unsigned SymbolIndex =
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203 Obj.getIndirectSymbolTableEntry(DySymTabCmd, FirstIndirectSymbol + i);
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204 symbol_iterator SI = Obj.getSymbolByIndex(SymbolIndex);
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120
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205 StringRef IndirectSymbolName;
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206 if (auto IndirectSymbolNameOrErr = SI->getName())
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207 IndirectSymbolName = *IndirectSymbolNameOrErr;
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208 else
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209 return IndirectSymbolNameOrErr.takeError();
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83
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210 DEBUG(dbgs() << " " << IndirectSymbolName << ": index " << SymbolIndex
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211 << ", PT offset: " << PTEntryOffset << "\n");
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212 RelocationEntry RE(PTSectionID, PTEntryOffset,
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213 MachO::GENERIC_RELOC_VANILLA, 0, false, 2);
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214 addRelocationForSymbol(RE, IndirectSymbolName);
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215 PTEntryOffset += PTEntrySize;
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216 }
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120
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217 return Error::success();
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83
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218 }
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219
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220 bool RuntimeDyldMachO::isCompatibleFile(const object::ObjectFile &Obj) const {
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221 return Obj.isMachO();
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77
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222 }
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223
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224 template <typename Impl>
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120
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225 Error
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226 RuntimeDyldMachOCRTPBase<Impl>::finalizeLoad(const ObjectFile &Obj,
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227 ObjSectionToIDMap &SectionMap) {
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228 unsigned EHFrameSID = RTDYLD_INVALID_SECTION_ID;
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229 unsigned TextSID = RTDYLD_INVALID_SECTION_ID;
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230 unsigned ExceptTabSID = RTDYLD_INVALID_SECTION_ID;
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77
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231
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95
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232 for (const auto &Section : Obj.sections()) {
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233 StringRef Name;
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234 Section.getName(Name);
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95
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235
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236 // Force emission of the __text, __eh_frame, and __gcc_except_tab sections
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237 // if they're present. Otherwise call down to the impl to handle other
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238 // sections that have already been emitted.
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120
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239 if (Name == "__text") {
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240 if (auto TextSIDOrErr = findOrEmitSection(Obj, Section, true, SectionMap))
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241 TextSID = *TextSIDOrErr;
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242 else
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243 return TextSIDOrErr.takeError();
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244 } else if (Name == "__eh_frame") {
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245 if (auto EHFrameSIDOrErr = findOrEmitSection(Obj, Section, false,
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246 SectionMap))
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247 EHFrameSID = *EHFrameSIDOrErr;
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248 else
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249 return EHFrameSIDOrErr.takeError();
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250 } else if (Name == "__gcc_except_tab") {
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251 if (auto ExceptTabSIDOrErr = findOrEmitSection(Obj, Section, true,
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252 SectionMap))
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253 ExceptTabSID = *ExceptTabSIDOrErr;
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254 else
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255 return ExceptTabSIDOrErr.takeError();
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256 } else {
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95
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257 auto I = SectionMap.find(Section);
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258 if (I != SectionMap.end())
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120
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259 if (auto Err = impl().finalizeSection(Obj, I->second, Section))
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260 return Err;
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95
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261 }
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262 }
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77
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263 UnregisteredEHFrameSections.push_back(
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264 EHFrameRelatedSections(EHFrameSID, TextSID, ExceptTabSID));
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120
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265
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266 return Error::success();
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267 }
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268
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269 template <typename Impl>
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270 unsigned char *RuntimeDyldMachOCRTPBase<Impl>::processFDE(uint8_t *P,
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77
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271 int64_t DeltaForText,
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272 int64_t DeltaForEH) {
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273 typedef typename Impl::TargetPtrT TargetPtrT;
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274
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275 DEBUG(dbgs() << "Processing FDE: Delta for text: " << DeltaForText
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276 << ", Delta for EH: " << DeltaForEH << "\n");
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83
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277 uint32_t Length = readBytesUnaligned(P, 4);
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77
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278 P += 4;
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100
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279 uint8_t *Ret = P + Length;
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83
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280 uint32_t Offset = readBytesUnaligned(P, 4);
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77
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281 if (Offset == 0) // is a CIE
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282 return Ret;
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283
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284 P += 4;
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83
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285 TargetPtrT FDELocation = readBytesUnaligned(P, sizeof(TargetPtrT));
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77
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286 TargetPtrT NewLocation = FDELocation - DeltaForText;
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83
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287 writeBytesUnaligned(NewLocation, P, sizeof(TargetPtrT));
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288
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77
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289 P += sizeof(TargetPtrT);
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290
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291 // Skip the FDE address range
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292 P += sizeof(TargetPtrT);
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293
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294 uint8_t Augmentationsize = *P;
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295 P += 1;
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296 if (Augmentationsize != 0) {
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83
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297 TargetPtrT LSDA = readBytesUnaligned(P, sizeof(TargetPtrT));
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77
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298 TargetPtrT NewLSDA = LSDA - DeltaForEH;
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83
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299 writeBytesUnaligned(NewLSDA, P, sizeof(TargetPtrT));
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77
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300 }
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301
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302 return Ret;
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303 }
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304
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|
77
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305 static int64_t computeDelta(SectionEntry *A, SectionEntry *B) {
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100
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306 int64_t ObjDistance = static_cast<int64_t>(A->getObjAddress()) -
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307 static_cast<int64_t>(B->getObjAddress());
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308 int64_t MemDistance = A->getLoadAddress() - B->getLoadAddress();
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77
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309 return ObjDistance - MemDistance;
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310 }
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311
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77
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312 template <typename Impl>
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313 void RuntimeDyldMachOCRTPBase<Impl>::registerEHFrames() {
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314
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315 for (int i = 0, e = UnregisteredEHFrameSections.size(); i != e; ++i) {
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316 EHFrameRelatedSections &SectionInfo = UnregisteredEHFrameSections[i];
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317 if (SectionInfo.EHFrameSID == RTDYLD_INVALID_SECTION_ID ||
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318 SectionInfo.TextSID == RTDYLD_INVALID_SECTION_ID)
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319 continue;
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320 SectionEntry *Text = &Sections[SectionInfo.TextSID];
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321 SectionEntry *EHFrame = &Sections[SectionInfo.EHFrameSID];
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322 SectionEntry *ExceptTab = nullptr;
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323 if (SectionInfo.ExceptTabSID != RTDYLD_INVALID_SECTION_ID)
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324 ExceptTab = &Sections[SectionInfo.ExceptTabSID];
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325
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77
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326 int64_t DeltaForText = computeDelta(Text, EHFrame);
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327 int64_t DeltaForEH = 0;
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328 if (ExceptTab)
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329 DeltaForEH = computeDelta(ExceptTab, EHFrame);
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330
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100
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331 uint8_t *P = EHFrame->getAddress();
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332 uint8_t *End = P + EHFrame->getSize();
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120
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333 while (P != End) {
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77
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334 P = processFDE(P, DeltaForText, DeltaForEH);
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120
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335 }
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77
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336
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100
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337 MemMgr.registerEHFrames(EHFrame->getAddress(), EHFrame->getLoadAddress(),
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338 EHFrame->getSize());
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339 }
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77
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340 UnregisteredEHFrameSections.clear();
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341 }
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342
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77
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343 std::unique_ptr<RuntimeDyldMachO>
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95
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344 RuntimeDyldMachO::create(Triple::ArchType Arch,
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345 RuntimeDyld::MemoryManager &MemMgr,
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120
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346 JITSymbolResolver &Resolver) {
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77
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347 switch (Arch) {
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348 default:
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77
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349 llvm_unreachable("Unsupported target for RuntimeDyldMachO.");
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350 break;
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95
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351 case Triple::arm:
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352 return make_unique<RuntimeDyldMachOARM>(MemMgr, Resolver);
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353 case Triple::aarch64:
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354 return make_unique<RuntimeDyldMachOAArch64>(MemMgr, Resolver);
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355 case Triple::x86:
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356 return make_unique<RuntimeDyldMachOI386>(MemMgr, Resolver);
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357 case Triple::x86_64:
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358 return make_unique<RuntimeDyldMachOX86_64>(MemMgr, Resolver);
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359 }
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360 }
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361
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83
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362 std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
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363 RuntimeDyldMachO::loadObject(const object::ObjectFile &O) {
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120
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364 if (auto ObjSectionToIDOrErr = loadObjectImpl(O))
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365 return llvm::make_unique<LoadedMachOObjectInfo>(*this,
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366 *ObjSectionToIDOrErr);
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367 else {
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368 HasError = true;
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369 raw_string_ostream ErrStream(ErrorStr);
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370 logAllUnhandledErrors(ObjSectionToIDOrErr.takeError(), ErrStream, "");
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371 return nullptr;
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372 }
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83
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373 }
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374
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375 } // end namespace llvm
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