1 //===- Win64EHDumper.cpp - Win64 EH Printer ---------------------*- 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 #include "Win64EHDumper.h" 11 #include "llvm-readobj.h" 12 #include "llvm/Object/COFF.h" 13 #include "llvm/Support/ErrorHandling.h" 14 #include "llvm/Support/Format.h" 15 16 using namespace llvm; 17 using namespace llvm::object; 18 using namespace llvm::Win64EH; 19 20 static const EnumEntry<unsigned> UnwindFlags[] = { 21 { "ExceptionHandler", UNW_ExceptionHandler }, 22 { "TerminateHandler", UNW_TerminateHandler }, 23 { "ChainInfo" , UNW_ChainInfo } 24 }; 25 26 static const EnumEntry<unsigned> UnwindOpInfo[] = { 27 { "RAX", 0 }, 28 { "RCX", 1 }, 29 { "RDX", 2 }, 30 { "RBX", 3 }, 31 { "RSP", 4 }, 32 { "RBP", 5 }, 33 { "RSI", 6 }, 34 { "RDI", 7 }, 35 { "R8", 8 }, 36 { "R9", 9 }, 37 { "R10", 10 }, 38 { "R11", 11 }, 39 { "R12", 12 }, 40 { "R13", 13 }, 41 { "R14", 14 }, 42 { "R15", 15 } 43 }; 44 45 static uint64_t getOffsetOfLSDA(const UnwindInfo& UI) { 46 return static_cast<const char*>(UI.getLanguageSpecificData()) 47 - reinterpret_cast<const char*>(&UI); 48 } 49 50 static uint32_t getLargeSlotValue(ArrayRef<UnwindCode> UC) { 51 if (UC.size() < 3) 52 return 0; 53 return UC[1].FrameOffset + (static_cast<uint32_t>(UC[2].FrameOffset) << 16); 54 } 55 56 // Returns the name of the unwind code. 57 static StringRef getUnwindCodeTypeName(uint8_t Code) { 58 switch (Code) { 59 default: llvm_unreachable("Invalid unwind code"); 60 case UOP_PushNonVol: return "PUSH_NONVOL"; 61 case UOP_AllocLarge: return "ALLOC_LARGE"; 62 case UOP_AllocSmall: return "ALLOC_SMALL"; 63 case UOP_SetFPReg: return "SET_FPREG"; 64 case UOP_SaveNonVol: return "SAVE_NONVOL"; 65 case UOP_SaveNonVolBig: return "SAVE_NONVOL_FAR"; 66 case UOP_SaveXMM128: return "SAVE_XMM128"; 67 case UOP_SaveXMM128Big: return "SAVE_XMM128_FAR"; 68 case UOP_PushMachFrame: return "PUSH_MACHFRAME"; 69 } 70 } 71 72 // Returns the name of a referenced register. 73 static StringRef getUnwindRegisterName(uint8_t Reg) { 74 switch (Reg) { 75 default: llvm_unreachable("Invalid register"); 76 case 0: return "RAX"; 77 case 1: return "RCX"; 78 case 2: return "RDX"; 79 case 3: return "RBX"; 80 case 4: return "RSP"; 81 case 5: return "RBP"; 82 case 6: return "RSI"; 83 case 7: return "RDI"; 84 case 8: return "R8"; 85 case 9: return "R9"; 86 case 10: return "R10"; 87 case 11: return "R11"; 88 case 12: return "R12"; 89 case 13: return "R13"; 90 case 14: return "R14"; 91 case 15: return "R15"; 92 } 93 } 94 95 // Calculates the number of array slots required for the unwind code. 96 static unsigned getNumUsedSlots(const UnwindCode &UnwindCode) { 97 switch (UnwindCode.getUnwindOp()) { 98 default: llvm_unreachable("Invalid unwind code"); 99 case UOP_PushNonVol: 100 case UOP_AllocSmall: 101 case UOP_SetFPReg: 102 case UOP_PushMachFrame: 103 return 1; 104 case UOP_SaveNonVol: 105 case UOP_SaveXMM128: 106 return 2; 107 case UOP_SaveNonVolBig: 108 case UOP_SaveXMM128Big: 109 return 3; 110 case UOP_AllocLarge: 111 return (UnwindCode.getOpInfo() == 0) ? 2 : 3; 112 } 113 } 114 115 static std::string formatSymbol(const Dumper::Context &Ctx, 116 const coff_section *Section, uint64_t Offset, 117 uint32_t Displacement) { 118 std::string Buffer; 119 raw_string_ostream OS(Buffer); 120 121 SymbolRef Symbol; 122 if (!Ctx.ResolveSymbol(Section, Offset, Symbol, Ctx.UserData)) { 123 if (ErrorOr<StringRef> Name = Symbol.getName()) { 124 OS << *Name; 125 if (Displacement > 0) 126 OS << format(" +0x%X (0x%" PRIX64 ")", Displacement, Offset); 127 else 128 OS << format(" (0x%" PRIX64 ")", Offset); 129 return OS.str(); 130 } 131 } 132 133 OS << format(" (0x%" PRIX64 ")", Offset); 134 return OS.str(); 135 } 136 137 static std::error_code resolveRelocation(const Dumper::Context &Ctx, 138 const coff_section *Section, 139 uint64_t Offset, 140 const coff_section *&ResolvedSection, 141 uint64_t &ResolvedAddress) { 142 SymbolRef Symbol; 143 if (std::error_code EC = 144 Ctx.ResolveSymbol(Section, Offset, Symbol, Ctx.UserData)) 145 return EC; 146 147 ErrorOr<uint64_t> ResolvedAddressOrErr = Symbol.getAddress(); 148 if (std::error_code EC = ResolvedAddressOrErr.getError()) 149 return EC; 150 ResolvedAddress = *ResolvedAddressOrErr; 151 152 ErrorOr<section_iterator> SI = Symbol.getSection(); 153 ResolvedSection = Ctx.COFF.getCOFFSection(**SI); 154 return std::error_code(); 155 } 156 157 namespace llvm { 158 namespace Win64EH { 159 void Dumper::printRuntimeFunctionEntry(const Context &Ctx, 160 const coff_section *Section, 161 uint64_t Offset, 162 const RuntimeFunction &RF) { 163 SW.printString("StartAddress", 164 formatSymbol(Ctx, Section, Offset + 0, RF.StartAddress)); 165 SW.printString("EndAddress", 166 formatSymbol(Ctx, Section, Offset + 4, RF.EndAddress)); 167 SW.printString("UnwindInfoAddress", 168 formatSymbol(Ctx, Section, Offset + 8, RF.UnwindInfoOffset)); 169 } 170 171 // Prints one unwind code. Because an unwind code can occupy up to 3 slots in 172 // the unwind codes array, this function requires that the correct number of 173 // slots is provided. 174 void Dumper::printUnwindCode(const UnwindInfo& UI, ArrayRef<UnwindCode> UC) { 175 assert(UC.size() >= getNumUsedSlots(UC[0])); 176 177 SW.startLine() << format("0x%02X: ", unsigned(UC[0].u.CodeOffset)) 178 << getUnwindCodeTypeName(UC[0].getUnwindOp()); 179 180 switch (UC[0].getUnwindOp()) { 181 case UOP_PushNonVol: 182 OS << " reg=" << getUnwindRegisterName(UC[0].getOpInfo()); 183 break; 184 185 case UOP_AllocLarge: 186 OS << " size=" 187 << ((UC[0].getOpInfo() == 0) ? UC[1].FrameOffset * 8 188 : getLargeSlotValue(UC)); 189 break; 190 191 case UOP_AllocSmall: 192 OS << " size=" << (UC[0].getOpInfo() + 1) * 8; 193 break; 194 195 case UOP_SetFPReg: 196 if (UI.getFrameRegister() == 0) 197 OS << " reg=<invalid>"; 198 else 199 OS << " reg=" << getUnwindRegisterName(UI.getFrameRegister()) 200 << format(", offset=0x%X", UI.getFrameOffset() * 16); 201 break; 202 203 case UOP_SaveNonVol: 204 OS << " reg=" << getUnwindRegisterName(UC[0].getOpInfo()) 205 << format(", offset=0x%X", UC[1].FrameOffset * 8); 206 break; 207 208 case UOP_SaveNonVolBig: 209 OS << " reg=" << getUnwindRegisterName(UC[0].getOpInfo()) 210 << format(", offset=0x%X", getLargeSlotValue(UC)); 211 break; 212 213 case UOP_SaveXMM128: 214 OS << " reg=XMM" << static_cast<uint32_t>(UC[0].getOpInfo()) 215 << format(", offset=0x%X", UC[1].FrameOffset * 16); 216 break; 217 218 case UOP_SaveXMM128Big: 219 OS << " reg=XMM" << static_cast<uint32_t>(UC[0].getOpInfo()) 220 << format(", offset=0x%X", getLargeSlotValue(UC)); 221 break; 222 223 case UOP_PushMachFrame: 224 OS << " errcode=" << (UC[0].getOpInfo() == 0 ? "no" : "yes"); 225 break; 226 } 227 228 OS << "\n"; 229 } 230 231 void Dumper::printUnwindInfo(const Context &Ctx, const coff_section *Section, 232 off_t Offset, const UnwindInfo &UI) { 233 DictScope UIS(SW, "UnwindInfo"); 234 SW.printNumber("Version", UI.getVersion()); 235 SW.printFlags("Flags", UI.getFlags(), makeArrayRef(UnwindFlags)); 236 SW.printNumber("PrologSize", UI.PrologSize); 237 if (UI.getFrameRegister()) { 238 SW.printEnum("FrameRegister", UI.getFrameRegister(), 239 makeArrayRef(UnwindOpInfo)); 240 SW.printHex("FrameOffset", UI.getFrameOffset()); 241 } else { 242 SW.printString("FrameRegister", StringRef("-")); 243 SW.printString("FrameOffset", StringRef("-")); 244 } 245 246 SW.printNumber("UnwindCodeCount", UI.NumCodes); 247 { 248 ListScope UCS(SW, "UnwindCodes"); 249 ArrayRef<UnwindCode> UC(&UI.UnwindCodes[0], UI.NumCodes); 250 for (const UnwindCode *UCI = UC.begin(), *UCE = UC.end(); UCI < UCE; ++UCI) { 251 unsigned UsedSlots = getNumUsedSlots(*UCI); 252 if (UsedSlots > UC.size()) { 253 errs() << "corrupt unwind data"; 254 return; 255 } 256 257 printUnwindCode(UI, makeArrayRef(UCI, UCE)); 258 UCI = UCI + UsedSlots - 1; 259 } 260 } 261 262 uint64_t LSDAOffset = Offset + getOffsetOfLSDA(UI); 263 if (UI.getFlags() & (UNW_ExceptionHandler | UNW_TerminateHandler)) { 264 SW.printString("Handler", 265 formatSymbol(Ctx, Section, LSDAOffset, 266 UI.getLanguageSpecificHandlerOffset())); 267 } else if (UI.getFlags() & UNW_ChainInfo) { 268 if (const RuntimeFunction *Chained = UI.getChainedFunctionEntry()) { 269 DictScope CS(SW, "Chained"); 270 printRuntimeFunctionEntry(Ctx, Section, LSDAOffset, *Chained); 271 } 272 } 273 } 274 275 void Dumper::printRuntimeFunction(const Context &Ctx, 276 const coff_section *Section, 277 uint64_t SectionOffset, 278 const RuntimeFunction &RF) { 279 DictScope RFS(SW, "RuntimeFunction"); 280 printRuntimeFunctionEntry(Ctx, Section, SectionOffset, RF); 281 282 const coff_section *XData; 283 uint64_t Offset; 284 resolveRelocation(Ctx, Section, SectionOffset + 8, XData, Offset); 285 286 ArrayRef<uint8_t> Contents; 287 error(Ctx.COFF.getSectionContents(XData, Contents)); 288 if (Contents.empty()) 289 return; 290 291 Offset = Offset + RF.UnwindInfoOffset; 292 if (Offset > Contents.size()) 293 return; 294 295 const auto UI = reinterpret_cast<const UnwindInfo*>(Contents.data() + Offset); 296 printUnwindInfo(Ctx, XData, Offset, *UI); 297 } 298 299 void Dumper::printData(const Context &Ctx) { 300 for (const auto &Section : Ctx.COFF.sections()) { 301 StringRef Name; 302 Section.getName(Name); 303 304 if (Name != ".pdata" && !Name.startswith(".pdata$")) 305 continue; 306 307 const coff_section *PData = Ctx.COFF.getCOFFSection(Section); 308 ArrayRef<uint8_t> Contents; 309 error(Ctx.COFF.getSectionContents(PData, Contents)); 310 if (Contents.empty()) 311 continue; 312 313 const RuntimeFunction *Entries = 314 reinterpret_cast<const RuntimeFunction *>(Contents.data()); 315 const size_t Count = Contents.size() / sizeof(RuntimeFunction); 316 ArrayRef<RuntimeFunction> RuntimeFunctions(Entries, Count); 317 318 size_t Index = 0; 319 for (const auto &RF : RuntimeFunctions) { 320 printRuntimeFunction(Ctx, Ctx.COFF.getCOFFSection(Section), 321 Index * sizeof(RuntimeFunction), RF); 322 ++Index; 323 } 324 } 325 } 326 } 327 } 328 329
