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1 //===- MachOUniversal.cpp - Mach-O universal binary -------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8 //
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9 // This file defines the MachOUniversalBinary class.
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10 //
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11 //===----------------------------------------------------------------------===//
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12
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13 #include "llvm/Object/MachOUniversal.h"
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14 #include "llvm/Object/Archive.h"
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221
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15 #include "llvm/Object/IRObjectFile.h"
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150
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16 #include "llvm/Object/MachO.h"
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17 #include "llvm/Object/ObjectFile.h"
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236
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18 #include "llvm/Support/ErrorHandling.h"
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19 #include "llvm/Support/SwapByteOrder.h"
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20 #include "llvm/Support/type_traits.h"
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150
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21
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22 using namespace llvm;
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23 using namespace object;
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24
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25 static Error
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26 malformedError(Twine Msg) {
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27 std::string StringMsg = "truncated or malformed fat file (" + Msg.str() + ")";
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28 return make_error<GenericBinaryError>(std::move(StringMsg),
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29 object_error::parse_failed);
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30 }
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31
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32 template<typename T>
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33 static T getUniversalBinaryStruct(const char *Ptr) {
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34 T Res;
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35 memcpy(&Res, Ptr, sizeof(T));
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36 // Universal binary headers have big-endian byte order.
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37 if (sys::IsLittleEndianHost)
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38 swapStruct(Res);
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39 return Res;
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40 }
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41
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42 MachOUniversalBinary::ObjectForArch::ObjectForArch(
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43 const MachOUniversalBinary *Parent, uint32_t Index)
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44 : Parent(Parent), Index(Index) {
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45 // The iterators use Parent as a nullptr and an Index+1 == NumberOfObjects.
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46 if (!Parent || Index >= Parent->getNumberOfObjects()) {
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47 clear();
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48 } else {
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49 // Parse object header.
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50 StringRef ParentData = Parent->getData();
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51 if (Parent->getMagic() == MachO::FAT_MAGIC) {
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52 const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
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53 Index * sizeof(MachO::fat_arch);
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54 Header = getUniversalBinaryStruct<MachO::fat_arch>(HeaderPos);
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55 } else { // Parent->getMagic() == MachO::FAT_MAGIC_64
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56 const char *HeaderPos = ParentData.begin() + sizeof(MachO::fat_header) +
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57 Index * sizeof(MachO::fat_arch_64);
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58 Header64 = getUniversalBinaryStruct<MachO::fat_arch_64>(HeaderPos);
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59 }
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60 }
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61 }
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62
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63 Expected<std::unique_ptr<MachOObjectFile>>
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64 MachOUniversalBinary::ObjectForArch::getAsObjectFile() const {
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65 if (!Parent)
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66 report_fatal_error("MachOUniversalBinary::ObjectForArch::getAsObjectFile() "
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67 "called when Parent is a nullptr");
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68
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69 StringRef ParentData = Parent->getData();
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70 StringRef ObjectData;
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71 uint32_t cputype;
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72 if (Parent->getMagic() == MachO::FAT_MAGIC) {
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73 ObjectData = ParentData.substr(Header.offset, Header.size);
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74 cputype = Header.cputype;
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75 } else { // Parent->getMagic() == MachO::FAT_MAGIC_64
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76 ObjectData = ParentData.substr(Header64.offset, Header64.size);
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77 cputype = Header64.cputype;
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78 }
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79 StringRef ObjectName = Parent->getFileName();
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80 MemoryBufferRef ObjBuffer(ObjectData, ObjectName);
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81 return ObjectFile::createMachOObjectFile(ObjBuffer, cputype, Index);
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82 }
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83
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221
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84 Expected<std::unique_ptr<IRObjectFile>>
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85 MachOUniversalBinary::ObjectForArch::getAsIRObject(LLVMContext &Ctx) const {
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86 if (!Parent)
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87 report_fatal_error("MachOUniversalBinary::ObjectForArch::getAsIRObject() "
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88 "called when Parent is a nullptr");
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89
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90 StringRef ParentData = Parent->getData();
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91 StringRef ObjectData;
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92 if (Parent->getMagic() == MachO::FAT_MAGIC) {
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93 ObjectData = ParentData.substr(Header.offset, Header.size);
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94 } else { // Parent->getMagic() == MachO::FAT_MAGIC_64
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95 ObjectData = ParentData.substr(Header64.offset, Header64.size);
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96 }
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97 StringRef ObjectName = Parent->getFileName();
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98 MemoryBufferRef ObjBuffer(ObjectData, ObjectName);
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99
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100 return IRObjectFile::create(ObjBuffer, Ctx);
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101 }
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102
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150
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103 Expected<std::unique_ptr<Archive>>
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104 MachOUniversalBinary::ObjectForArch::getAsArchive() const {
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105 if (!Parent)
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106 report_fatal_error("MachOUniversalBinary::ObjectForArch::getAsArchive() "
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107 "called when Parent is a nullptr");
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108
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109 StringRef ParentData = Parent->getData();
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110 StringRef ObjectData;
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111 if (Parent->getMagic() == MachO::FAT_MAGIC)
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112 ObjectData = ParentData.substr(Header.offset, Header.size);
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113 else // Parent->getMagic() == MachO::FAT_MAGIC_64
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114 ObjectData = ParentData.substr(Header64.offset, Header64.size);
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115 StringRef ObjectName = Parent->getFileName();
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116 MemoryBufferRef ObjBuffer(ObjectData, ObjectName);
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117 return Archive::create(ObjBuffer);
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118 }
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119
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120 void MachOUniversalBinary::anchor() { }
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121
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122 Expected<std::unique_ptr<MachOUniversalBinary>>
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123 MachOUniversalBinary::create(MemoryBufferRef Source) {
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124 Error Err = Error::success();
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125 std::unique_ptr<MachOUniversalBinary> Ret(
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126 new MachOUniversalBinary(Source, Err));
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127 if (Err)
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128 return std::move(Err);
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129 return std::move(Ret);
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130 }
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131
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132 MachOUniversalBinary::MachOUniversalBinary(MemoryBufferRef Source, Error &Err)
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133 : Binary(Binary::ID_MachOUniversalBinary, Source), Magic(0),
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134 NumberOfObjects(0) {
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135 ErrorAsOutParameter ErrAsOutParam(&Err);
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136 if (Data.getBufferSize() < sizeof(MachO::fat_header)) {
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137 Err = make_error<GenericBinaryError>("File too small to be a Mach-O "
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138 "universal file",
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139 object_error::invalid_file_type);
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140 return;
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141 }
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142 // Check for magic value and sufficient header size.
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143 StringRef Buf = getData();
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144 MachO::fat_header H =
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145 getUniversalBinaryStruct<MachO::fat_header>(Buf.begin());
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146 Magic = H.magic;
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147 NumberOfObjects = H.nfat_arch;
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148 if (NumberOfObjects == 0) {
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149 Err = malformedError("contains zero architecture types");
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150 return;
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151 }
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152 uint32_t MinSize = sizeof(MachO::fat_header);
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153 if (Magic == MachO::FAT_MAGIC)
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154 MinSize += sizeof(MachO::fat_arch) * NumberOfObjects;
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155 else if (Magic == MachO::FAT_MAGIC_64)
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156 MinSize += sizeof(MachO::fat_arch_64) * NumberOfObjects;
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157 else {
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158 Err = malformedError("bad magic number");
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159 return;
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160 }
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161 if (Buf.size() < MinSize) {
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162 Err = malformedError("fat_arch" +
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163 Twine(Magic == MachO::FAT_MAGIC ? "" : "_64") +
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164 " structs would extend past the end of the file");
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165 return;
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166 }
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167 for (uint32_t i = 0; i < NumberOfObjects; i++) {
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168 ObjectForArch A(this, i);
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169 uint64_t bigSize = A.getOffset();
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170 bigSize += A.getSize();
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171 if (bigSize > Buf.size()) {
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172 Err = malformedError("offset plus size of cputype (" +
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173 Twine(A.getCPUType()) + ") cpusubtype (" +
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174 Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
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175 ") extends past the end of the file");
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176 return;
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177 }
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178
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179 if (A.getAlign() > MaxSectionAlignment) {
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180 Err = malformedError("align (2^" + Twine(A.getAlign()) +
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181 ") too large for cputype (" + Twine(A.getCPUType()) +
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182 ") cpusubtype (" +
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183 Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
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184 ") (maximum 2^" + Twine(MaxSectionAlignment) + ")");
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185 return;
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186 }
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187 if(A.getOffset() % (1ull << A.getAlign()) != 0){
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188 Err = malformedError("offset: " + Twine(A.getOffset()) +
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189 " for cputype (" + Twine(A.getCPUType()) + ") cpusubtype (" +
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190 Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
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191 ") not aligned on it's alignment (2^" + Twine(A.getAlign()) + ")");
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192 return;
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193 }
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194 if (A.getOffset() < MinSize) {
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195 Err = malformedError("cputype (" + Twine(A.getCPUType()) + ") "
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196 "cpusubtype (" + Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
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197 ") offset " + Twine(A.getOffset()) + " overlaps universal headers");
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198 return;
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199 }
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200 }
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201 for (uint32_t i = 0; i < NumberOfObjects; i++) {
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202 ObjectForArch A(this, i);
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203 for (uint32_t j = i + 1; j < NumberOfObjects; j++) {
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204 ObjectForArch B(this, j);
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205 if (A.getCPUType() == B.getCPUType() &&
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206 (A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) ==
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207 (B.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK)) {
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208 Err = malformedError("contains two of the same architecture (cputype "
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209 "(" + Twine(A.getCPUType()) + ") cpusubtype (" +
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210 Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) + "))");
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211 return;
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212 }
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213 if ((A.getOffset() >= B.getOffset() &&
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214 A.getOffset() < B.getOffset() + B.getSize()) ||
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215 (A.getOffset() + A.getSize() > B.getOffset() &&
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216 A.getOffset() + A.getSize() < B.getOffset() + B.getSize()) ||
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217 (A.getOffset() <= B.getOffset() &&
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218 A.getOffset() + A.getSize() >= B.getOffset() + B.getSize())) {
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219 Err = malformedError("cputype (" + Twine(A.getCPUType()) + ") "
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220 "cpusubtype (" + Twine(A.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK) +
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221 ") at offset " + Twine(A.getOffset()) + " with a size of " +
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222 Twine(A.getSize()) + ", overlaps cputype (" + Twine(B.getCPUType()) +
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223 ") cpusubtype (" + Twine(B.getCPUSubType() & ~MachO::CPU_SUBTYPE_MASK)
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224 + ") at offset " + Twine(B.getOffset()) + " with a size of "
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225 + Twine(B.getSize()));
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226 return;
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227 }
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228 }
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229 }
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230 Err = Error::success();
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231 }
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232
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233 Expected<MachOUniversalBinary::ObjectForArch>
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234 MachOUniversalBinary::getObjectForArch(StringRef ArchName) const {
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235 if (Triple(ArchName).getArch() == Triple::ArchType::UnknownArch)
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236 return make_error<GenericBinaryError>("Unknown architecture "
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237 "named: " +
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238 ArchName,
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239 object_error::arch_not_found);
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240 for (const auto &Obj : objects())
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241 if (Obj.getArchFlagName() == ArchName)
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242 return Obj;
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243 return make_error<GenericBinaryError>("fat file does not "
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244 "contain " +
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245 ArchName,
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246 object_error::arch_not_found);
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247 }
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248
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249 Expected<std::unique_ptr<MachOObjectFile>>
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250 MachOUniversalBinary::getMachOObjectForArch(StringRef ArchName) const {
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251 Expected<ObjectForArch> O = getObjectForArch(ArchName);
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252 if (!O)
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253 return O.takeError();
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254 return O->getAsObjectFile();
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255 }
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256
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221
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257 Expected<std::unique_ptr<IRObjectFile>>
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258 MachOUniversalBinary::getIRObjectForArch(StringRef ArchName,
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259 LLVMContext &Ctx) const {
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260 Expected<ObjectForArch> O = getObjectForArch(ArchName);
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261 if (!O)
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262 return O.takeError();
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263 return O->getAsIRObject(Ctx);
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264 }
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265
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266 Expected<std::unique_ptr<Archive>>
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267 MachOUniversalBinary::getArchiveForArch(StringRef ArchName) const {
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268 Expected<ObjectForArch> O = getObjectForArch(ArchName);
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269 if (!O)
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270 return O.takeError();
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271 return O->getAsArchive();
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272 }
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