1 //===- Win64EHDumper.cpp - Win64 EH Printer ---------------------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #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"
17 using namespace llvm::object;
18 using namespace llvm::Win64EH;
20 static const EnumEntry<unsigned> UnwindFlags[] = {
21 { "ExceptionHandler", UNW_ExceptionHandler },
22 { "TerminateHandler", UNW_TerminateHandler },
23 { "ChainInfo" , UNW_ChainInfo }
26 static const EnumEntry<unsigned> UnwindOpInfo[] = {
45 static uint64_t getOffsetOfLSDA(const UnwindInfo& UI) {
46 return static_cast<const char*>(UI.getLanguageSpecificData())
47 - reinterpret_cast<const char*>(&UI);
50 static uint32_t getLargeSlotValue(ArrayRef<UnwindCode> UC) {
53 return UC[1].FrameOffset + (static_cast<uint32_t>(UC[2].FrameOffset) << 16);
56 // Returns the name of the unwind code.
57 static StringRef getUnwindCodeTypeName(uint8_t 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";
72 // Returns the name of a referenced register.
73 static StringRef getUnwindRegisterName(uint8_t Reg) {
75 default: llvm_unreachable("Invalid register");
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";
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");
102 case UOP_PushMachFrame:
107 case UOP_SaveNonVolBig:
108 case UOP_SaveXMM128Big:
111 return (UnwindCode.getOpInfo() == 0) ? 2 : 3;
115 static std::error_code getSymbol(const COFFObjectFile &COFF, uint64_t VA,
116 object::SymbolRef &Sym) {
117 for (const auto &Symbol : COFF.symbols()) {
118 Expected<uint64_t> Address = Symbol.getAddress();
120 return errorToErrorCode(Address.takeError());
121 if (*Address == VA) {
123 return readobj_error::success;
126 return readobj_error::unknown_symbol;
129 static std::string formatSymbol(const Dumper::Context &Ctx,
130 const coff_section *Section, uint64_t Offset,
131 uint32_t Displacement) {
133 raw_string_ostream OS(Buffer);
136 if (!Ctx.ResolveSymbol(Section, Offset, Symbol, Ctx.UserData)) {
137 Expected<StringRef> Name = Symbol.getName();
140 if (Displacement > 0)
141 OS << format(" +0x%X (0x%" PRIX64 ")", Displacement, Offset);
143 OS << format(" (0x%" PRIX64 ")", Offset);
146 // TODO: Actually report errors helpfully.
147 consumeError(Name.takeError());
149 } else if (!getSymbol(Ctx.COFF, Ctx.COFF.getImageBase() + Displacement,
151 Expected<StringRef> Name = Symbol.getName();
154 OS << format(" (0x%" PRIX64 ")", Ctx.COFF.getImageBase() + Displacement);
157 consumeError(Name.takeError());
161 if (Displacement > 0)
162 OS << format("(0x%" PRIX64 ")", Ctx.COFF.getImageBase() + Displacement);
164 OS << format("(0x%" PRIX64 ")", Offset);
168 static std::error_code resolveRelocation(const Dumper::Context &Ctx,
169 const coff_section *Section,
171 const coff_section *&ResolvedSection,
172 uint64_t &ResolvedAddress) {
174 if (std::error_code EC =
175 Ctx.ResolveSymbol(Section, Offset, Symbol, Ctx.UserData))
178 Expected<uint64_t> ResolvedAddressOrErr = Symbol.getAddress();
179 if (!ResolvedAddressOrErr)
180 return errorToErrorCode(ResolvedAddressOrErr.takeError());
181 ResolvedAddress = *ResolvedAddressOrErr;
183 Expected<section_iterator> SI = Symbol.getSection();
185 return errorToErrorCode(SI.takeError());
186 ResolvedSection = Ctx.COFF.getCOFFSection(**SI);
187 return std::error_code();
190 static const object::coff_section *
191 getSectionContaining(const COFFObjectFile &COFF, uint64_t VA) {
192 for (const auto &Section : COFF.sections()) {
193 uint64_t Address = Section.getAddress();
194 uint64_t Size = Section.getSize();
196 if (VA >= Address && (VA - Address) <= Size)
197 return COFF.getCOFFSection(Section);
204 void Dumper::printRuntimeFunctionEntry(const Context &Ctx,
205 const coff_section *Section,
207 const RuntimeFunction &RF) {
208 SW.printString("StartAddress",
209 formatSymbol(Ctx, Section, Offset + 0, RF.StartAddress));
210 SW.printString("EndAddress",
211 formatSymbol(Ctx, Section, Offset + 4, RF.EndAddress));
212 SW.printString("UnwindInfoAddress",
213 formatSymbol(Ctx, Section, Offset + 8, RF.UnwindInfoOffset));
216 // Prints one unwind code. Because an unwind code can occupy up to 3 slots in
217 // the unwind codes array, this function requires that the correct number of
218 // slots is provided.
219 void Dumper::printUnwindCode(const UnwindInfo& UI, ArrayRef<UnwindCode> UC) {
220 assert(UC.size() >= getNumUsedSlots(UC[0]));
222 SW.startLine() << format("0x%02X: ", unsigned(UC[0].u.CodeOffset))
223 << getUnwindCodeTypeName(UC[0].getUnwindOp());
225 switch (UC[0].getUnwindOp()) {
227 OS << " reg=" << getUnwindRegisterName(UC[0].getOpInfo());
232 << ((UC[0].getOpInfo() == 0) ? UC[1].FrameOffset * 8
233 : getLargeSlotValue(UC));
237 OS << " size=" << (UC[0].getOpInfo() + 1) * 8;
241 if (UI.getFrameRegister() == 0)
242 OS << " reg=<invalid>";
244 OS << " reg=" << getUnwindRegisterName(UI.getFrameRegister())
245 << format(", offset=0x%X", UI.getFrameOffset() * 16);
249 OS << " reg=" << getUnwindRegisterName(UC[0].getOpInfo())
250 << format(", offset=0x%X", UC[1].FrameOffset * 8);
253 case UOP_SaveNonVolBig:
254 OS << " reg=" << getUnwindRegisterName(UC[0].getOpInfo())
255 << format(", offset=0x%X", getLargeSlotValue(UC));
259 OS << " reg=XMM" << static_cast<uint32_t>(UC[0].getOpInfo())
260 << format(", offset=0x%X", UC[1].FrameOffset * 16);
263 case UOP_SaveXMM128Big:
264 OS << " reg=XMM" << static_cast<uint32_t>(UC[0].getOpInfo())
265 << format(", offset=0x%X", getLargeSlotValue(UC));
268 case UOP_PushMachFrame:
269 OS << " errcode=" << (UC[0].getOpInfo() == 0 ? "no" : "yes");
276 void Dumper::printUnwindInfo(const Context &Ctx, const coff_section *Section,
277 off_t Offset, const UnwindInfo &UI) {
278 DictScope UIS(SW, "UnwindInfo");
279 SW.printNumber("Version", UI.getVersion());
280 SW.printFlags("Flags", UI.getFlags(), makeArrayRef(UnwindFlags));
281 SW.printNumber("PrologSize", UI.PrologSize);
282 if (UI.getFrameRegister()) {
283 SW.printEnum("FrameRegister", UI.getFrameRegister(),
284 makeArrayRef(UnwindOpInfo));
285 SW.printHex("FrameOffset", UI.getFrameOffset());
287 SW.printString("FrameRegister", StringRef("-"));
288 SW.printString("FrameOffset", StringRef("-"));
291 SW.printNumber("UnwindCodeCount", UI.NumCodes);
293 ListScope UCS(SW, "UnwindCodes");
294 ArrayRef<UnwindCode> UC(&UI.UnwindCodes[0], UI.NumCodes);
295 for (const UnwindCode *UCI = UC.begin(), *UCE = UC.end(); UCI < UCE; ++UCI) {
296 unsigned UsedSlots = getNumUsedSlots(*UCI);
297 if (UsedSlots > UC.size()) {
298 errs() << "corrupt unwind data";
302 printUnwindCode(UI, makeArrayRef(UCI, UCE));
303 UCI = UCI + UsedSlots - 1;
307 uint64_t LSDAOffset = Offset + getOffsetOfLSDA(UI);
308 if (UI.getFlags() & (UNW_ExceptionHandler | UNW_TerminateHandler)) {
309 SW.printString("Handler",
310 formatSymbol(Ctx, Section, LSDAOffset,
311 UI.getLanguageSpecificHandlerOffset()));
312 } else if (UI.getFlags() & UNW_ChainInfo) {
313 if (const RuntimeFunction *Chained = UI.getChainedFunctionEntry()) {
314 DictScope CS(SW, "Chained");
315 printRuntimeFunctionEntry(Ctx, Section, LSDAOffset, *Chained);
320 void Dumper::printRuntimeFunction(const Context &Ctx,
321 const coff_section *Section,
322 uint64_t SectionOffset,
323 const RuntimeFunction &RF) {
324 DictScope RFS(SW, "RuntimeFunction");
325 printRuntimeFunctionEntry(Ctx, Section, SectionOffset, RF);
327 const coff_section *XData = nullptr;
329 resolveRelocation(Ctx, Section, SectionOffset + 8, XData, Offset);
330 Offset = Offset + RF.UnwindInfoOffset;
333 uint64_t Address = Ctx.COFF.getImageBase() + RF.UnwindInfoOffset;
334 XData = getSectionContaining(Ctx.COFF, Address);
337 Offset = RF.UnwindInfoOffset - XData->VirtualAddress;
340 ArrayRef<uint8_t> Contents;
341 if (Error E = Ctx.COFF.getSectionContents(XData, Contents))
342 reportError(std::move(E), Ctx.COFF.getFileName());
344 if (Contents.empty())
347 if (Offset > Contents.size())
350 const auto UI = reinterpret_cast<const UnwindInfo*>(Contents.data() + Offset);
351 printUnwindInfo(Ctx, XData, Offset, *UI);
354 void Dumper::printData(const Context &Ctx) {
355 for (const auto &Section : Ctx.COFF.sections()) {
357 if (Expected<StringRef> NameOrErr = Section.getName())
360 consumeError(NameOrErr.takeError());
362 if (Name != ".pdata" && !Name.startswith(".pdata$"))
365 const coff_section *PData = Ctx.COFF.getCOFFSection(Section);
366 ArrayRef<uint8_t> Contents;
368 if (Error E = Ctx.COFF.getSectionContents(PData, Contents))
369 reportError(std::move(E), Ctx.COFF.getFileName());
370 if (Contents.empty())
373 const RuntimeFunction *Entries =
374 reinterpret_cast<const RuntimeFunction *>(Contents.data());
375 const size_t Count = Contents.size() / sizeof(RuntimeFunction);
376 ArrayRef<RuntimeFunction> RuntimeFunctions(Entries, Count);
379 for (const auto &RF : RuntimeFunctions) {
380 printRuntimeFunction(Ctx, Ctx.COFF.getCOFFSection(Section),
381 Index * sizeof(RuntimeFunction), RF);