| //===-- ARMWinEHPrinter.cpp - Windows on ARM EH Data Printer ----*- C++ -*-===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // Windows on ARM uses a series of serialised data structures (RuntimeFunction) |
| // to create a table of information for unwinding. In order to conserve space, |
| // there are two different ways that this data is represented. |
| // |
| // For functions with canonical forms for the prologue and epilogue, the data |
| // can be stored in a "packed" form. In this case, the data is packed into the |
| // RuntimeFunction's remaining 30-bits and can fully describe the entire frame. |
| // |
| // +---------------------------------------+ |
| // | Function Entry Address | |
| // +---------------------------------------+ |
| // | Packed Form Data | |
| // +---------------------------------------+ |
| // |
| // This layout is parsed by Decoder::dumpPackedEntry. No unwind bytecode is |
| // associated with such a frame as they can be derived from the provided data. |
| // The decoder does not synthesize this data as it is unnecessary for the |
| // purposes of validation, with the synthesis being required only by a proper |
| // unwinder. |
| // |
| // For functions that are large or do not match canonical forms, the data is |
| // split up into two portions, with the actual data residing in the "exception |
| // data" table (.xdata) with a reference to the entry from the "procedure data" |
| // (.pdata) entry. |
| // |
| // The exception data contains information about the frame setup, all of the |
| // epilogue scopes (for functions for which there are multiple exit points) and |
| // the associated exception handler. Additionally, the entry contains byte-code |
| // describing how to unwind the function (c.f. Decoder::decodeOpcodes). |
| // |
| // +---------------------------------------+ |
| // | Function Entry Address | |
| // +---------------------------------------+ |
| // | Exception Data Entry Address | |
| // +---------------------------------------+ |
| // |
| // This layout is parsed by Decoder::dumpUnpackedEntry. Such an entry must |
| // first resolve the exception data entry address. This structure |
| // (ExceptionDataRecord) has a variable sized header |
| // (c.f. ARM::WinEH::HeaderWords) and encodes most of the same information as |
| // the packed form. However, because this information is insufficient to |
| // synthesize the unwinding, there are associated unwinding bytecode which make |
| // up the bulk of the Decoder. |
| // |
| // The decoder itself is table-driven, using the first byte to determine the |
| // opcode and dispatching to the associated printing routine. The bytecode |
| // itself is a variable length instruction encoding that can fully describe the |
| // state of the stack and the necessary operations for unwinding to the |
| // beginning of the frame. |
| // |
| // The byte-code maintains a 1-1 instruction mapping, indicating both the width |
| // of the instruction (Thumb2 instructions are variable length, 16 or 32 bits |
| // wide) allowing the program to unwind from any point in the prologue, body, or |
| // epilogue of the function. |
| |
| #include "ARMWinEHPrinter.h" |
| #include "Error.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/Support/ARMWinEH.h" |
| #include "llvm/Support/Format.h" |
| |
| using namespace llvm; |
| using namespace llvm::object; |
| using namespace llvm::support; |
| |
| namespace llvm { |
| raw_ostream &operator<<(raw_ostream &OS, const ARM::WinEH::ReturnType &RT) { |
| switch (RT) { |
| case ARM::WinEH::ReturnType::RT_POP: |
| OS << "pop {pc}"; |
| break; |
| case ARM::WinEH::ReturnType::RT_B: |
| OS << "b target"; |
| break; |
| case ARM::WinEH::ReturnType::RT_BW: |
| OS << "b.w target"; |
| break; |
| case ARM::WinEH::ReturnType::RT_NoEpilogue: |
| OS << "(no epilogue)"; |
| break; |
| } |
| return OS; |
| } |
| } |
| |
| static std::string formatSymbol(StringRef Name, uint64_t Address, |
| uint64_t Offset = 0) { |
| std::string Buffer; |
| raw_string_ostream OS(Buffer); |
| |
| if (!Name.empty()) |
| OS << Name << " "; |
| |
| if (Offset) |
| OS << format("+0x%X (0x%" PRIX64 ")", Offset, Address); |
| else if (!Name.empty()) |
| OS << format("(0x%" PRIX64 ")", Address); |
| else |
| OS << format("0x%" PRIX64, Address); |
| |
| return OS.str(); |
| } |
| |
| namespace llvm { |
| namespace ARM { |
| namespace WinEH { |
| const size_t Decoder::PDataEntrySize = sizeof(RuntimeFunction); |
| |
| // TODO name the uops more appropriately |
| const Decoder::RingEntry Decoder::Ring[] = { |
| { 0x80, 0x00, &Decoder::opcode_0xxxxxxx }, // UOP_STACK_FREE (16-bit) |
| { 0xc0, 0x80, &Decoder::opcode_10Lxxxxx }, // UOP_POP (32-bit) |
| { 0xf0, 0xc0, &Decoder::opcode_1100xxxx }, // UOP_STACK_SAVE (16-bit) |
| { 0xf8, 0xd0, &Decoder::opcode_11010Lxx }, // UOP_POP (16-bit) |
| { 0xf8, 0xd8, &Decoder::opcode_11011Lxx }, // UOP_POP (32-bit) |
| { 0xf8, 0xe0, &Decoder::opcode_11100xxx }, // UOP_VPOP (32-bit) |
| { 0xfc, 0xe8, &Decoder::opcode_111010xx }, // UOP_STACK_FREE (32-bit) |
| { 0xfe, 0xec, &Decoder::opcode_1110110L }, // UOP_POP (16-bit) |
| { 0xff, 0xee, &Decoder::opcode_11101110 }, // UOP_MICROSOFT_SPECIFIC (16-bit) |
| // UOP_PUSH_MACHINE_FRAME |
| // UOP_PUSH_CONTEXT |
| // UOP_PUSH_TRAP_FRAME |
| // UOP_REDZONE_RESTORE_LR |
| { 0xff, 0xef, &Decoder::opcode_11101111 }, // UOP_LDRPC_POSTINC (32-bit) |
| { 0xff, 0xf5, &Decoder::opcode_11110101 }, // UOP_VPOP (32-bit) |
| { 0xff, 0xf6, &Decoder::opcode_11110110 }, // UOP_VPOP (32-bit) |
| { 0xff, 0xf7, &Decoder::opcode_11110111 }, // UOP_STACK_RESTORE (16-bit) |
| { 0xff, 0xf8, &Decoder::opcode_11111000 }, // UOP_STACK_RESTORE (16-bit) |
| { 0xff, 0xf9, &Decoder::opcode_11111001 }, // UOP_STACK_RESTORE (32-bit) |
| { 0xff, 0xfa, &Decoder::opcode_11111010 }, // UOP_STACK_RESTORE (32-bit) |
| { 0xff, 0xfb, &Decoder::opcode_11111011 }, // UOP_NOP (16-bit) |
| { 0xff, 0xfc, &Decoder::opcode_11111100 }, // UOP_NOP (32-bit) |
| { 0xff, 0xfd, &Decoder::opcode_11111101 }, // UOP_NOP (16-bit) / END |
| { 0xff, 0xfe, &Decoder::opcode_11111110 }, // UOP_NOP (32-bit) / END |
| { 0xff, 0xff, &Decoder::opcode_11111111 }, // UOP_END |
| }; |
| |
| void Decoder::printRegisters(const std::pair<uint16_t, uint32_t> &RegisterMask) { |
| static const char * const GPRRegisterNames[16] = { |
| "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", |
| "r11", "ip", "sp", "lr", "pc", |
| }; |
| |
| const uint16_t GPRMask = std::get<0>(RegisterMask); |
| const uint16_t VFPMask = std::get<1>(RegisterMask); |
| |
| OS << '{'; |
| bool Comma = false; |
| for (unsigned RI = 0, RE = 11; RI < RE; ++RI) { |
| if (GPRMask & (1 << RI)) { |
| if (Comma) |
| OS << ", "; |
| OS << GPRRegisterNames[RI]; |
| Comma = true; |
| } |
| } |
| for (unsigned RI = 0, RE = 32; RI < RE; ++RI) { |
| if (VFPMask & (1 << RI)) { |
| if (Comma) |
| OS << ", "; |
| OS << "d" << unsigned(RI); |
| Comma = true; |
| } |
| } |
| for (unsigned RI = 11, RE = 16; RI < RE; ++RI) { |
| if (GPRMask & (1 << RI)) { |
| if (Comma) |
| OS << ", "; |
| OS << GPRRegisterNames[RI]; |
| Comma = true; |
| } |
| } |
| OS << '}'; |
| } |
| |
| ErrorOr<object::SectionRef> |
| Decoder::getSectionContaining(const COFFObjectFile &COFF, uint64_t VA) { |
| for (const auto &Section : COFF.sections()) { |
| uint64_t Address = Section.getAddress(); |
| uint64_t Size = Section.getSize(); |
| |
| if (VA >= Address && (VA - Address) <= Size) |
| return Section; |
| } |
| return readobj_error::unknown_symbol; |
| } |
| |
| ErrorOr<object::SymbolRef> Decoder::getSymbol(const COFFObjectFile &COFF, |
| uint64_t VA, bool FunctionOnly) { |
| for (const auto &Symbol : COFF.symbols()) { |
| Expected<SymbolRef::Type> Type = Symbol.getType(); |
| if (!Type) |
| return errorToErrorCode(Type.takeError()); |
| if (FunctionOnly && *Type != SymbolRef::ST_Function) |
| continue; |
| |
| Expected<uint64_t> Address = Symbol.getAddress(); |
| if (!Address) |
| return errorToErrorCode(Address.takeError()); |
| if (*Address == VA) |
| return Symbol; |
| } |
| return readobj_error::unknown_symbol; |
| } |
| |
| ErrorOr<SymbolRef> Decoder::getRelocatedSymbol(const COFFObjectFile &, |
| const SectionRef &Section, |
| uint64_t Offset) { |
| for (const auto &Relocation : Section.relocations()) { |
| uint64_t RelocationOffset = Relocation.getOffset(); |
| if (RelocationOffset == Offset) |
| return *Relocation.getSymbol(); |
| } |
| return readobj_error::unknown_symbol; |
| } |
| |
| bool Decoder::opcode_0xxxxxxx(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| uint8_t Imm = OC[Offset] & 0x7f; |
| SW.startLine() << format("0x%02x ; %s sp, #(%u * 4)\n", |
| OC[Offset], |
| static_cast<const char *>(Prologue ? "sub" : "add"), |
| Imm); |
| ++Offset; |
| return false; |
| } |
| |
| bool Decoder::opcode_10Lxxxxx(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| unsigned Link = (OC[Offset] & 0x20) >> 5; |
| uint16_t RegisterMask = (Link << (Prologue ? 14 : 15)) |
| | ((OC[Offset + 0] & 0x1f) << 8) |
| | ((OC[Offset + 1] & 0xff) << 0); |
| assert((~RegisterMask & (1 << 13)) && "sp must not be set"); |
| assert((~RegisterMask & (1 << (Prologue ? 15 : 14))) && "pc must not be set"); |
| |
| SW.startLine() << format("0x%02x 0x%02x ; %s.w ", |
| OC[Offset + 0], OC[Offset + 1], |
| Prologue ? "push" : "pop"); |
| printRegisters(std::make_pair(RegisterMask, 0)); |
| OS << '\n'; |
| |
| Offset += 2; |
| return false; |
| } |
| |
| bool Decoder::opcode_1100xxxx(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| if (Prologue) |
| SW.startLine() << format("0x%02x ; mov r%u, sp\n", |
| OC[Offset], OC[Offset] & 0xf); |
| else |
| SW.startLine() << format("0x%02x ; mov sp, r%u\n", |
| OC[Offset], OC[Offset] & 0xf); |
| ++Offset; |
| return false; |
| } |
| |
| bool Decoder::opcode_11010Lxx(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| unsigned Link = (OC[Offset] & 0x4) >> 3; |
| unsigned Count = (OC[Offset] & 0x3); |
| |
| uint16_t GPRMask = (Link << (Prologue ? 14 : 15)) |
| | (((1 << (Count + 1)) - 1) << 4); |
| |
| SW.startLine() << format("0x%02x ; %s ", OC[Offset], |
| Prologue ? "push" : "pop"); |
| printRegisters(std::make_pair(GPRMask, 0)); |
| OS << '\n'; |
| |
| ++Offset; |
| return false; |
| } |
| |
| bool Decoder::opcode_11011Lxx(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| unsigned Link = (OC[Offset] & 0x4) >> 2; |
| unsigned Count = (OC[Offset] & 0x3) + 4; |
| |
| uint16_t GPRMask = (Link << (Prologue ? 14 : 15)) |
| | (((1 << (Count + 1)) - 1) << 4); |
| |
| SW.startLine() << format("0x%02x ; %s.w ", OC[Offset], |
| Prologue ? "push" : "pop"); |
| printRegisters(std::make_pair(GPRMask, 0)); |
| OS << '\n'; |
| |
| ++Offset; |
| return false; |
| } |
| |
| bool Decoder::opcode_11100xxx(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| unsigned High = (OC[Offset] & 0x7); |
| uint32_t VFPMask = (((1 << (High + 1)) - 1) << 8); |
| |
| SW.startLine() << format("0x%02x ; %s ", OC[Offset], |
| Prologue ? "vpush" : "vpop"); |
| printRegisters(std::make_pair(0, VFPMask)); |
| OS << '\n'; |
| |
| ++Offset; |
| return false; |
| } |
| |
| bool Decoder::opcode_111010xx(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| uint16_t Imm = ((OC[Offset + 0] & 0x03) << 8) | ((OC[Offset + 1] & 0xff) << 0); |
| |
| SW.startLine() << format("0x%02x 0x%02x ; %s.w sp, #(%u * 4)\n", |
| OC[Offset + 0], OC[Offset + 1], |
| static_cast<const char *>(Prologue ? "sub" : "add"), |
| Imm); |
| |
| Offset += 2; |
| return false; |
| } |
| |
| bool Decoder::opcode_1110110L(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| uint8_t GPRMask = ((OC[Offset + 0] & 0x01) << (Prologue ? 14 : 15)) |
| | ((OC[Offset + 1] & 0xff) << 0); |
| |
| SW.startLine() << format("0x%02x 0x%02x ; %s ", OC[Offset + 0], |
| OC[Offset + 1], Prologue ? "push" : "pop"); |
| printRegisters(std::make_pair(GPRMask, 0)); |
| OS << '\n'; |
| |
| Offset += 2; |
| return false; |
| } |
| |
| bool Decoder::opcode_11101110(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| assert(!Prologue && "may not be used in prologue"); |
| |
| if (OC[Offset + 1] & 0xf0) |
| SW.startLine() << format("0x%02x 0x%02x ; reserved\n", |
| OC[Offset + 0], OC[Offset + 1]); |
| else |
| SW.startLine() |
| << format("0x%02x 0x%02x ; microsoft-specific (type: %u)\n", |
| OC[Offset + 0], OC[Offset + 1], OC[Offset + 1] & 0x0f); |
| |
| Offset += 2; |
| return false; |
| } |
| |
| bool Decoder::opcode_11101111(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| assert(!Prologue && "may not be used in prologue"); |
| |
| if (OC[Offset + 1] & 0xf0) |
| SW.startLine() << format("0x%02x 0x%02x ; reserved\n", |
| OC[Offset + 0], OC[Offset + 1]); |
| else |
| SW.startLine() |
| << format("0x%02x 0x%02x ; ldr.w lr, [sp], #%u\n", |
| OC[Offset + 0], OC[Offset + 1], OC[Offset + 1] << 2); |
| |
| Offset += 2; |
| return false; |
| } |
| |
| bool Decoder::opcode_11110101(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| unsigned Start = (OC[Offset + 1] & 0xf0) >> 4; |
| unsigned End = (OC[Offset + 1] & 0x0f) >> 0; |
| uint32_t VFPMask = ((1 << (End - Start)) - 1) << Start; |
| |
| SW.startLine() << format("0x%02x 0x%02x ; %s ", OC[Offset + 0], |
| OC[Offset + 1], Prologue ? "vpush" : "vpop"); |
| printRegisters(std::make_pair(0, VFPMask)); |
| OS << '\n'; |
| |
| Offset += 2; |
| return false; |
| } |
| |
| bool Decoder::opcode_11110110(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| unsigned Start = (OC[Offset + 1] & 0xf0) >> 4; |
| unsigned End = (OC[Offset + 1] & 0x0f) >> 0; |
| uint32_t VFPMask = ((1 << (End - Start)) - 1) << 16; |
| |
| SW.startLine() << format("0x%02x 0x%02x ; %s ", OC[Offset + 0], |
| OC[Offset + 1], Prologue ? "vpush" : "vpop"); |
| printRegisters(std::make_pair(0, VFPMask)); |
| OS << '\n'; |
| |
| Offset += 2; |
| return false; |
| } |
| |
| bool Decoder::opcode_11110111(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| uint32_t Imm = (OC[Offset + 1] << 8) | (OC[Offset + 2] << 0); |
| |
| SW.startLine() << format("0x%02x 0x%02x 0x%02x ; %s sp, sp, #(%u * 4)\n", |
| OC[Offset + 0], OC[Offset + 1], OC[Offset + 2], |
| static_cast<const char *>(Prologue ? "sub" : "add"), |
| Imm); |
| |
| Offset += 3; |
| return false; |
| } |
| |
| bool Decoder::opcode_11111000(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| uint32_t Imm = (OC[Offset + 1] << 16) |
| | (OC[Offset + 2] << 8) |
| | (OC[Offset + 3] << 0); |
| |
| SW.startLine() |
| << format("0x%02x 0x%02x 0x%02x 0x%02x ; %s sp, sp, #(%u * 4)\n", |
| OC[Offset + 0], OC[Offset + 1], OC[Offset + 2], OC[Offset + 3], |
| static_cast<const char *>(Prologue ? "sub" : "add"), Imm); |
| |
| Offset += 4; |
| return false; |
| } |
| |
| bool Decoder::opcode_11111001(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| uint32_t Imm = (OC[Offset + 1] << 8) | (OC[Offset + 2] << 0); |
| |
| SW.startLine() |
| << format("0x%02x 0x%02x 0x%02x ; %s.w sp, sp, #(%u * 4)\n", |
| OC[Offset + 0], OC[Offset + 1], OC[Offset + 2], |
| static_cast<const char *>(Prologue ? "sub" : "add"), Imm); |
| |
| Offset += 3; |
| return false; |
| } |
| |
| bool Decoder::opcode_11111010(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| uint32_t Imm = (OC[Offset + 1] << 16) |
| | (OC[Offset + 2] << 8) |
| | (OC[Offset + 3] << 0); |
| |
| SW.startLine() |
| << format("0x%02x 0x%02x 0x%02x 0x%02x ; %s.w sp, sp, #(%u * 4)\n", |
| OC[Offset + 0], OC[Offset + 1], OC[Offset + 2], OC[Offset + 3], |
| static_cast<const char *>(Prologue ? "sub" : "add"), Imm); |
| |
| Offset += 4; |
| return false; |
| } |
| |
| bool Decoder::opcode_11111011(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| SW.startLine() << format("0x%02x ; nop\n", OC[Offset]); |
| ++Offset; |
| return false; |
| } |
| |
| bool Decoder::opcode_11111100(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| SW.startLine() << format("0x%02x ; nop.w\n", OC[Offset]); |
| ++Offset; |
| return false; |
| } |
| |
| bool Decoder::opcode_11111101(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| SW.startLine() << format("0x%02x ; b\n", OC[Offset]); |
| ++Offset; |
| return true; |
| } |
| |
| bool Decoder::opcode_11111110(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| SW.startLine() << format("0x%02x ; b.w\n", OC[Offset]); |
| ++Offset; |
| return true; |
| } |
| |
| bool Decoder::opcode_11111111(const uint8_t *OC, unsigned &Offset, |
| unsigned Length, bool Prologue) { |
| ++Offset; |
| return true; |
| } |
| |
| void Decoder::decodeOpcodes(ArrayRef<uint8_t> Opcodes, unsigned Offset, |
| bool Prologue) { |
| assert((!Prologue || Offset == 0) && "prologue should always use offset 0"); |
| |
| bool Terminated = false; |
| for (unsigned OI = Offset, OE = Opcodes.size(); !Terminated && OI < OE; ) { |
| for (unsigned DI = 0;; ++DI) { |
| if ((Opcodes[OI] & Ring[DI].Mask) == Ring[DI].Value) { |
| Terminated = (this->*Ring[DI].Routine)(Opcodes.data(), OI, 0, Prologue); |
| break; |
| } |
| assert(DI < array_lengthof(Ring) && "unhandled opcode"); |
| } |
| } |
| } |
| |
| bool Decoder::dumpXDataRecord(const COFFObjectFile &COFF, |
| const SectionRef &Section, |
| uint64_t FunctionAddress, uint64_t VA) { |
| ArrayRef<uint8_t> Contents; |
| if (COFF.getSectionContents(COFF.getCOFFSection(Section), Contents)) |
| return false; |
| |
| uint64_t SectionVA = Section.getAddress(); |
| uint64_t Offset = VA - SectionVA; |
| const ulittle32_t *Data = |
| reinterpret_cast<const ulittle32_t *>(Contents.data() + Offset); |
| const ExceptionDataRecord XData(Data); |
| |
| DictScope XRS(SW, "ExceptionData"); |
| SW.printNumber("FunctionLength", XData.FunctionLength() << 1); |
| SW.printNumber("Version", XData.Vers()); |
| SW.printBoolean("ExceptionData", XData.X()); |
| SW.printBoolean("EpiloguePacked", XData.E()); |
| SW.printBoolean("Fragment", XData.F()); |
| SW.printNumber(XData.E() ? "EpilogueOffset" : "EpilogueScopes", |
| XData.EpilogueCount()); |
| SW.printNumber("ByteCodeLength", |
| static_cast<uint64_t>(XData.CodeWords() * sizeof(uint32_t))); |
| |
| if (XData.E()) { |
| ArrayRef<uint8_t> UC = XData.UnwindByteCode(); |
| if (!XData.F()) { |
| ListScope PS(SW, "Prologue"); |
| decodeOpcodes(UC, 0, /*Prologue=*/true); |
| } |
| if (XData.EpilogueCount()) { |
| ListScope ES(SW, "Epilogue"); |
| decodeOpcodes(UC, XData.EpilogueCount(), /*Prologue=*/false); |
| } |
| } else { |
| ArrayRef<ulittle32_t> EpilogueScopes = XData.EpilogueScopes(); |
| ListScope ESS(SW, "EpilogueScopes"); |
| for (const EpilogueScope ES : EpilogueScopes) { |
| DictScope ESES(SW, "EpilogueScope"); |
| SW.printNumber("StartOffset", ES.EpilogueStartOffset()); |
| SW.printNumber("Condition", ES.Condition()); |
| SW.printNumber("EpilogueStartIndex", ES.EpilogueStartIndex()); |
| |
| ListScope Opcodes(SW, "Opcodes"); |
| decodeOpcodes(XData.UnwindByteCode(), ES.EpilogueStartIndex(), |
| /*Prologue=*/false); |
| } |
| } |
| |
| if (XData.X()) { |
| const uint32_t Address = XData.ExceptionHandlerRVA(); |
| const uint32_t Parameter = XData.ExceptionHandlerParameter(); |
| const size_t HandlerOffset = HeaderWords(XData) |
| + (XData.E() ? 0 : XData.EpilogueCount()) |
| + XData.CodeWords(); |
| |
| ErrorOr<SymbolRef> Symbol = |
| getRelocatedSymbol(COFF, Section, HandlerOffset * sizeof(uint32_t)); |
| if (!Symbol) |
| Symbol = getSymbol(COFF, Address, /*FunctionOnly=*/true); |
| |
| Expected<StringRef> Name = Symbol->getName(); |
| if (!Name) { |
| std::string Buf; |
| llvm::raw_string_ostream OS(Buf); |
| logAllUnhandledErrors(Name.takeError(), OS, ""); |
| OS.flush(); |
| report_fatal_error(Buf); |
| } |
| |
| ListScope EHS(SW, "ExceptionHandler"); |
| SW.printString("Routine", formatSymbol(*Name, Address)); |
| SW.printHex("Parameter", Parameter); |
| } |
| |
| return true; |
| } |
| |
| bool Decoder::dumpUnpackedEntry(const COFFObjectFile &COFF, |
| const SectionRef Section, uint64_t Offset, |
| unsigned Index, const RuntimeFunction &RF) { |
| assert(RF.Flag() == RuntimeFunctionFlag::RFF_Unpacked && |
| "packed entry cannot be treated as an unpacked entry"); |
| |
| ErrorOr<SymbolRef> Function = getRelocatedSymbol(COFF, Section, Offset); |
| if (!Function) |
| Function = getSymbol(COFF, RF.BeginAddress, /*FunctionOnly=*/true); |
| |
| ErrorOr<SymbolRef> XDataRecord = getRelocatedSymbol(COFF, Section, Offset + 4); |
| if (!XDataRecord) |
| XDataRecord = getSymbol(COFF, RF.ExceptionInformationRVA()); |
| |
| if (!RF.BeginAddress && !Function) |
| return false; |
| if (!RF.UnwindData && !XDataRecord) |
| return false; |
| |
| StringRef FunctionName; |
| uint64_t FunctionAddress; |
| if (Function) { |
| Expected<StringRef> FunctionNameOrErr = Function->getName(); |
| if (!FunctionNameOrErr) { |
| std::string Buf; |
| llvm::raw_string_ostream OS(Buf); |
| logAllUnhandledErrors(FunctionNameOrErr.takeError(), OS, ""); |
| OS.flush(); |
| report_fatal_error(Buf); |
| } |
| FunctionName = *FunctionNameOrErr; |
| Expected<uint64_t> FunctionAddressOrErr = Function->getAddress(); |
| if (!FunctionAddressOrErr) { |
| std::string Buf; |
| llvm::raw_string_ostream OS(Buf); |
| logAllUnhandledErrors(FunctionAddressOrErr.takeError(), OS, ""); |
| OS.flush(); |
| report_fatal_error(Buf); |
| } |
| FunctionAddress = *FunctionAddressOrErr; |
| } else { |
| const pe32_header *PEHeader; |
| if (COFF.getPE32Header(PEHeader)) |
| return false; |
| FunctionAddress = PEHeader->ImageBase + RF.BeginAddress; |
| } |
| |
| SW.printString("Function", formatSymbol(FunctionName, FunctionAddress)); |
| |
| if (XDataRecord) { |
| Expected<StringRef> Name = XDataRecord->getName(); |
| if (!Name) { |
| std::string Buf; |
| llvm::raw_string_ostream OS(Buf); |
| logAllUnhandledErrors(Name.takeError(), OS, ""); |
| OS.flush(); |
| report_fatal_error(Buf); |
| } |
| |
| Expected<uint64_t> AddressOrErr = XDataRecord->getAddress(); |
| if (!AddressOrErr) { |
| std::string Buf; |
| llvm::raw_string_ostream OS(Buf); |
| logAllUnhandledErrors(AddressOrErr.takeError(), OS, ""); |
| OS.flush(); |
| report_fatal_error(Buf); |
| } |
| uint64_t Address = *AddressOrErr; |
| |
| SW.printString("ExceptionRecord", formatSymbol(*Name, Address)); |
| |
| Expected<section_iterator> SIOrErr = XDataRecord->getSection(); |
| if (!SIOrErr) { |
| // TODO: Actually report errors helpfully. |
| consumeError(SIOrErr.takeError()); |
| return false; |
| } |
| section_iterator SI = *SIOrErr; |
| |
| return dumpXDataRecord(COFF, *SI, FunctionAddress, Address); |
| } else { |
| const pe32_header *PEHeader; |
| if (COFF.getPE32Header(PEHeader)) |
| return false; |
| |
| uint64_t Address = PEHeader->ImageBase + RF.ExceptionInformationRVA(); |
| SW.printString("ExceptionRecord", formatSymbol("", Address)); |
| |
| ErrorOr<SectionRef> Section = |
| getSectionContaining(COFF, RF.ExceptionInformationRVA()); |
| if (!Section) |
| return false; |
| |
| return dumpXDataRecord(COFF, *Section, FunctionAddress, |
| RF.ExceptionInformationRVA()); |
| } |
| } |
| |
| bool Decoder::dumpPackedEntry(const object::COFFObjectFile &COFF, |
| const SectionRef Section, uint64_t Offset, |
| unsigned Index, const RuntimeFunction &RF) { |
| assert((RF.Flag() == RuntimeFunctionFlag::RFF_Packed || |
| RF.Flag() == RuntimeFunctionFlag::RFF_PackedFragment) && |
| "unpacked entry cannot be treated as a packed entry"); |
| |
| ErrorOr<SymbolRef> Function = getRelocatedSymbol(COFF, Section, Offset); |
| if (!Function) |
| Function = getSymbol(COFF, RF.BeginAddress, /*FunctionOnly=*/true); |
| |
| StringRef FunctionName; |
| uint64_t FunctionAddress; |
| if (Function) { |
| Expected<StringRef> FunctionNameOrErr = Function->getName(); |
| if (!FunctionNameOrErr) { |
| std::string Buf; |
| llvm::raw_string_ostream OS(Buf); |
| logAllUnhandledErrors(FunctionNameOrErr.takeError(), OS, ""); |
| OS.flush(); |
| report_fatal_error(Buf); |
| } |
| FunctionName = *FunctionNameOrErr; |
| Expected<uint64_t> FunctionAddressOrErr = Function->getAddress(); |
| if (!FunctionAddressOrErr) { |
| std::string Buf; |
| llvm::raw_string_ostream OS(Buf); |
| logAllUnhandledErrors(FunctionAddressOrErr.takeError(), OS, ""); |
| OS.flush(); |
| report_fatal_error(Buf); |
| } |
| FunctionAddress = *FunctionAddressOrErr; |
| } else { |
| const pe32_header *PEHeader; |
| if (COFF.getPE32Header(PEHeader)) |
| return false; |
| FunctionAddress = PEHeader->ImageBase + RF.BeginAddress; |
| } |
| |
| SW.printString("Function", formatSymbol(FunctionName, FunctionAddress)); |
| SW.printBoolean("Fragment", |
| RF.Flag() == RuntimeFunctionFlag::RFF_PackedFragment); |
| SW.printNumber("FunctionLength", RF.FunctionLength()); |
| SW.startLine() << "ReturnType: " << RF.Ret() << '\n'; |
| SW.printBoolean("HomedParameters", RF.H()); |
| SW.startLine() << "SavedRegisters: "; |
| printRegisters(SavedRegisterMask(RF)); |
| OS << '\n'; |
| SW.printNumber("StackAdjustment", StackAdjustment(RF) << 2); |
| |
| return true; |
| } |
| |
| bool Decoder::dumpProcedureDataEntry(const COFFObjectFile &COFF, |
| const SectionRef Section, unsigned Index, |
| ArrayRef<uint8_t> Contents) { |
| uint64_t Offset = PDataEntrySize * Index; |
| const ulittle32_t *Data = |
| reinterpret_cast<const ulittle32_t *>(Contents.data() + Offset); |
| |
| const RuntimeFunction Entry(Data); |
| DictScope RFS(SW, "RuntimeFunction"); |
| if (Entry.Flag() == RuntimeFunctionFlag::RFF_Unpacked) |
| return dumpUnpackedEntry(COFF, Section, Offset, Index, Entry); |
| return dumpPackedEntry(COFF, Section, Offset, Index, Entry); |
| } |
| |
| void Decoder::dumpProcedureData(const COFFObjectFile &COFF, |
| const SectionRef Section) { |
| ArrayRef<uint8_t> Contents; |
| if (COFF.getSectionContents(COFF.getCOFFSection(Section), Contents)) |
| return; |
| |
| if (Contents.size() % PDataEntrySize) { |
| errs() << ".pdata content is not " << PDataEntrySize << "-byte aligned\n"; |
| return; |
| } |
| |
| for (unsigned EI = 0, EE = Contents.size() / PDataEntrySize; EI < EE; ++EI) |
| if (!dumpProcedureDataEntry(COFF, Section, EI, Contents)) |
| break; |
| } |
| |
| std::error_code Decoder::dumpProcedureData(const COFFObjectFile &COFF) { |
| for (const auto &Section : COFF.sections()) { |
| StringRef SectionName; |
| if (std::error_code EC = |
| COFF.getSectionName(COFF.getCOFFSection(Section), SectionName)) |
| return EC; |
| |
| if (SectionName.startswith(".pdata")) |
| dumpProcedureData(COFF, Section); |
| } |
| return std::error_code(); |
| } |
| } |
| } |
| } |
