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330 lines
10 KiB
C++
330 lines
10 KiB
C++
//===- Win64EHDumper.cpp - Win64 EH Printer ---------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "Win64EHDumper.h"
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#include "llvm-readobj.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Format.h"
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using namespace llvm;
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using namespace llvm::object;
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using namespace llvm::Win64EH;
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static const EnumEntry<unsigned> UnwindFlags[] = {
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{ "ExceptionHandler", UNW_ExceptionHandler },
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{ "TerminateHandler", UNW_TerminateHandler },
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{ "ChainInfo" , UNW_ChainInfo }
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};
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static const EnumEntry<unsigned> UnwindOpInfo[] = {
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{ "RAX", 0 },
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{ "RCX", 1 },
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{ "RDX", 2 },
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{ "RBX", 3 },
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{ "RSP", 4 },
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{ "RBP", 5 },
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{ "RSI", 6 },
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{ "RDI", 7 },
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{ "R8", 8 },
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{ "R9", 9 },
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{ "R10", 10 },
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{ "R11", 11 },
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{ "R12", 12 },
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{ "R13", 13 },
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{ "R14", 14 },
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{ "R15", 15 }
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};
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static uint64_t getOffsetOfLSDA(const UnwindInfo& UI) {
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return static_cast<const char*>(UI.getLanguageSpecificData())
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- reinterpret_cast<const char*>(&UI);
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}
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static uint32_t getLargeSlotValue(ArrayRef<UnwindCode> UC) {
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if (UC.size() < 3)
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return 0;
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return UC[1].FrameOffset + (static_cast<uint32_t>(UC[2].FrameOffset) << 16);
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}
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// Returns the name of the unwind code.
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static StringRef getUnwindCodeTypeName(uint8_t Code) {
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switch (Code) {
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default: llvm_unreachable("Invalid unwind code");
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case UOP_PushNonVol: return "PUSH_NONVOL";
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case UOP_AllocLarge: return "ALLOC_LARGE";
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case UOP_AllocSmall: return "ALLOC_SMALL";
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case UOP_SetFPReg: return "SET_FPREG";
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case UOP_SaveNonVol: return "SAVE_NONVOL";
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case UOP_SaveNonVolBig: return "SAVE_NONVOL_FAR";
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case UOP_SaveXMM128: return "SAVE_XMM128";
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case UOP_SaveXMM128Big: return "SAVE_XMM128_FAR";
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case UOP_PushMachFrame: return "PUSH_MACHFRAME";
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}
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}
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// Returns the name of a referenced register.
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static StringRef getUnwindRegisterName(uint8_t Reg) {
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switch (Reg) {
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default: llvm_unreachable("Invalid register");
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case 0: return "RAX";
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case 1: return "RCX";
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case 2: return "RDX";
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case 3: return "RBX";
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case 4: return "RSP";
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case 5: return "RBP";
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case 6: return "RSI";
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case 7: return "RDI";
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case 8: return "R8";
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case 9: return "R9";
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case 10: return "R10";
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case 11: return "R11";
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case 12: return "R12";
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case 13: return "R13";
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case 14: return "R14";
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case 15: return "R15";
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}
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}
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// Calculates the number of array slots required for the unwind code.
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static unsigned getNumUsedSlots(const UnwindCode &UnwindCode) {
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switch (UnwindCode.getUnwindOp()) {
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default: llvm_unreachable("Invalid unwind code");
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case UOP_PushNonVol:
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case UOP_AllocSmall:
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case UOP_SetFPReg:
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case UOP_PushMachFrame:
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return 1;
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case UOP_SaveNonVol:
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case UOP_SaveXMM128:
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return 2;
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case UOP_SaveNonVolBig:
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case UOP_SaveXMM128Big:
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return 3;
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case UOP_AllocLarge:
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return (UnwindCode.getOpInfo() == 0) ? 2 : 3;
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}
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}
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static std::string formatSymbol(const Dumper::Context &Ctx,
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const coff_section *Section, uint64_t Offset,
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uint32_t Displacement) {
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std::string Buffer;
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raw_string_ostream OS(Buffer);
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StringRef Name;
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SymbolRef Symbol;
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if (Ctx.ResolveSymbol(Section, Offset, Symbol, Ctx.UserData) ||
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Symbol.getName(Name)) {
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OS << format(" (0x%" PRIX64 ")", Offset);
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return OS.str();
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}
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OS << Name;
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if (Displacement > 0)
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OS << format(" +0x%X (0x%" PRIX64 ")", Displacement, Offset);
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else
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OS << format(" (0x%" PRIX64 ")", Offset);
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return OS.str();
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}
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static std::error_code resolveRelocation(const Dumper::Context &Ctx,
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const coff_section *Section,
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uint64_t Offset,
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const coff_section *&ResolvedSection,
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uint64_t &ResolvedAddress) {
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SymbolRef Symbol;
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if (std::error_code EC =
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Ctx.ResolveSymbol(Section, Offset, Symbol, Ctx.UserData))
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return EC;
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if (std::error_code EC = Symbol.getAddress(ResolvedAddress))
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return EC;
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section_iterator SI = Ctx.COFF.section_begin();
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if (std::error_code EC = Symbol.getSection(SI))
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return EC;
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ResolvedSection = Ctx.COFF.getCOFFSection(*SI);
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return object_error::success;
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}
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namespace llvm {
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namespace Win64EH {
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void Dumper::printRuntimeFunctionEntry(const Context &Ctx,
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const coff_section *Section,
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uint64_t Offset,
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const RuntimeFunction &RF) {
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SW.printString("StartAddress",
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formatSymbol(Ctx, Section, Offset + 0, RF.StartAddress));
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SW.printString("EndAddress",
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formatSymbol(Ctx, Section, Offset + 4, RF.EndAddress));
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SW.printString("UnwindInfoAddress",
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formatSymbol(Ctx, Section, Offset + 8, RF.UnwindInfoOffset));
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}
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// Prints one unwind code. Because an unwind code can occupy up to 3 slots in
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// the unwind codes array, this function requires that the correct number of
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// slots is provided.
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void Dumper::printUnwindCode(const UnwindInfo& UI, ArrayRef<UnwindCode> UC) {
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assert(UC.size() >= getNumUsedSlots(UC[0]));
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SW.startLine() << format("0x%02X: ", unsigned(UC[0].u.CodeOffset))
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<< getUnwindCodeTypeName(UC[0].getUnwindOp());
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switch (UC[0].getUnwindOp()) {
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case UOP_PushNonVol:
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OS << " reg=" << getUnwindRegisterName(UC[0].getOpInfo());
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break;
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case UOP_AllocLarge:
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OS << " size="
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<< ((UC[0].getOpInfo() == 0) ? UC[1].FrameOffset * 8
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: getLargeSlotValue(UC));
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break;
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case UOP_AllocSmall:
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OS << " size=" << (UC[0].getOpInfo() + 1) * 8;
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break;
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case UOP_SetFPReg:
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if (UI.getFrameRegister() == 0)
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OS << " reg=<invalid>";
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else
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OS << " reg=" << getUnwindRegisterName(UI.getFrameRegister())
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<< format(", offset=0x%X", UI.getFrameOffset() * 16);
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break;
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case UOP_SaveNonVol:
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OS << " reg=" << getUnwindRegisterName(UC[0].getOpInfo())
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<< format(", offset=0x%X", UC[1].FrameOffset * 8);
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break;
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case UOP_SaveNonVolBig:
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OS << " reg=" << getUnwindRegisterName(UC[0].getOpInfo())
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<< format(", offset=0x%X", getLargeSlotValue(UC));
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break;
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case UOP_SaveXMM128:
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OS << " reg=XMM" << static_cast<uint32_t>(UC[0].getOpInfo())
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<< format(", offset=0x%X", UC[1].FrameOffset * 16);
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break;
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case UOP_SaveXMM128Big:
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OS << " reg=XMM" << static_cast<uint32_t>(UC[0].getOpInfo())
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<< format(", offset=0x%X", getLargeSlotValue(UC));
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break;
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case UOP_PushMachFrame:
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OS << " errcode=" << (UC[0].getOpInfo() == 0 ? "no" : "yes");
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break;
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}
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OS << "\n";
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}
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void Dumper::printUnwindInfo(const Context &Ctx, const coff_section *Section,
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off_t Offset, const UnwindInfo &UI) {
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DictScope UIS(SW, "UnwindInfo");
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SW.printNumber("Version", UI.getVersion());
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SW.printFlags("Flags", UI.getFlags(), makeArrayRef(UnwindFlags));
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SW.printNumber("PrologSize", UI.PrologSize);
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if (UI.getFrameRegister()) {
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SW.printEnum("FrameRegister", UI.getFrameRegister(),
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makeArrayRef(UnwindOpInfo));
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SW.printHex("FrameOffset", UI.getFrameOffset());
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} else {
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SW.printString("FrameRegister", StringRef("-"));
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SW.printString("FrameOffset", StringRef("-"));
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}
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SW.printNumber("UnwindCodeCount", UI.NumCodes);
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{
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ListScope UCS(SW, "UnwindCodes");
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ArrayRef<UnwindCode> UC(&UI.UnwindCodes[0], UI.NumCodes);
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for (const UnwindCode *UCI = UC.begin(), *UCE = UC.end(); UCI < UCE; ++UCI) {
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unsigned UsedSlots = getNumUsedSlots(*UCI);
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if (UsedSlots > UC.size()) {
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errs() << "corrupt unwind data";
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return;
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}
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printUnwindCode(UI, ArrayRef<UnwindCode>(UCI, UCE));
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UCI = UCI + UsedSlots - 1;
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}
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}
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uint64_t LSDAOffset = Offset + getOffsetOfLSDA(UI);
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if (UI.getFlags() & (UNW_ExceptionHandler | UNW_TerminateHandler)) {
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SW.printString("Handler",
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formatSymbol(Ctx, Section, LSDAOffset,
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UI.getLanguageSpecificHandlerOffset()));
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} else if (UI.getFlags() & UNW_ChainInfo) {
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if (const RuntimeFunction *Chained = UI.getChainedFunctionEntry()) {
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DictScope CS(SW, "Chained");
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printRuntimeFunctionEntry(Ctx, Section, LSDAOffset, *Chained);
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}
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}
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}
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void Dumper::printRuntimeFunction(const Context &Ctx,
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const coff_section *Section,
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uint64_t SectionOffset,
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const RuntimeFunction &RF) {
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DictScope RFS(SW, "RuntimeFunction");
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printRuntimeFunctionEntry(Ctx, Section, SectionOffset, RF);
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const coff_section *XData;
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uint64_t Offset;
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if (error(resolveRelocation(Ctx, Section, SectionOffset + 8, XData, Offset)))
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return;
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ArrayRef<uint8_t> Contents;
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if (error(Ctx.COFF.getSectionContents(XData, Contents)) || Contents.empty())
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return;
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Offset = Offset + RF.UnwindInfoOffset;
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if (Offset > Contents.size())
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return;
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const auto UI = reinterpret_cast<const UnwindInfo*>(Contents.data() + Offset);
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printUnwindInfo(Ctx, XData, Offset, *UI);
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}
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void Dumper::printData(const Context &Ctx) {
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for (const auto &Section : Ctx.COFF.sections()) {
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StringRef Name;
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if (error(Section.getName(Name)))
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continue;
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if (Name != ".pdata" && !Name.startswith(".pdata$"))
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continue;
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const coff_section *PData = Ctx.COFF.getCOFFSection(Section);
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ArrayRef<uint8_t> Contents;
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if (error(Ctx.COFF.getSectionContents(PData, Contents)) || Contents.empty())
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continue;
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const RuntimeFunction *Entries =
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reinterpret_cast<const RuntimeFunction *>(Contents.data());
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const size_t Count = Contents.size() / sizeof(RuntimeFunction);
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ArrayRef<RuntimeFunction> RuntimeFunctions(Entries, Count);
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size_t Index = 0;
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for (const auto &RF : RuntimeFunctions) {
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printRuntimeFunction(Ctx, Ctx.COFF.getCOFFSection(Section),
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Index * sizeof(RuntimeFunction), RF);
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++Index;
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}
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}
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}
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}
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}
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