558 lines
20 KiB
C++
558 lines
20 KiB
C++
//===-- COFFDump.cpp - COFF-specific dumper ---------------------*- 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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///
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/// \file
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/// \brief This file implements the COFF-specific dumper for llvm-objdump.
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/// It outputs the Win64 EH data structures as plain text.
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/// The encoding of the unwind codes is described in MSDN:
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/// http://msdn.microsoft.com/en-us/library/ck9asaa9.aspx
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///
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//===----------------------------------------------------------------------===//
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#include "llvm-objdump.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Support/Win64EH.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <cstring>
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#include <system_error>
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using namespace llvm;
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using namespace object;
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using namespace llvm::Win64EH;
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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 "UOP_PushNonVol";
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case UOP_AllocLarge: return "UOP_AllocLarge";
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case UOP_AllocSmall: return "UOP_AllocSmall";
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case UOP_SetFPReg: return "UOP_SetFPReg";
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case UOP_SaveNonVol: return "UOP_SaveNonVol";
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case UOP_SaveNonVolBig: return "UOP_SaveNonVolBig";
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case UOP_SaveXMM128: return "UOP_SaveXMM128";
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case UOP_SaveXMM128Big: return "UOP_SaveXMM128Big";
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case UOP_PushMachFrame: return "UOP_PushMachFrame";
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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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// 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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static void printUnwindCode(ArrayRef<UnwindCode> UCs) {
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assert(UCs.size() >= getNumUsedSlots(UCs[0]));
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outs() << format(" 0x%02x: ", unsigned(UCs[0].u.CodeOffset))
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<< getUnwindCodeTypeName(UCs[0].getUnwindOp());
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switch (UCs[0].getUnwindOp()) {
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case UOP_PushNonVol:
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outs() << " " << getUnwindRegisterName(UCs[0].getOpInfo());
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break;
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case UOP_AllocLarge:
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if (UCs[0].getOpInfo() == 0) {
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outs() << " " << UCs[1].FrameOffset;
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} else {
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outs() << " " << UCs[1].FrameOffset
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+ (static_cast<uint32_t>(UCs[2].FrameOffset) << 16);
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}
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break;
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case UOP_AllocSmall:
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outs() << " " << ((UCs[0].getOpInfo() + 1) * 8);
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break;
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case UOP_SetFPReg:
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outs() << " ";
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break;
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case UOP_SaveNonVol:
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outs() << " " << getUnwindRegisterName(UCs[0].getOpInfo())
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<< format(" [0x%04x]", 8 * UCs[1].FrameOffset);
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break;
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case UOP_SaveNonVolBig:
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outs() << " " << getUnwindRegisterName(UCs[0].getOpInfo())
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<< format(" [0x%08x]", UCs[1].FrameOffset
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+ (static_cast<uint32_t>(UCs[2].FrameOffset) << 16));
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break;
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case UOP_SaveXMM128:
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outs() << " XMM" << static_cast<uint32_t>(UCs[0].getOpInfo())
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<< format(" [0x%04x]", 16 * UCs[1].FrameOffset);
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break;
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case UOP_SaveXMM128Big:
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outs() << " XMM" << UCs[0].getOpInfo()
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<< format(" [0x%08x]", UCs[1].FrameOffset
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+ (static_cast<uint32_t>(UCs[2].FrameOffset) << 16));
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break;
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case UOP_PushMachFrame:
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outs() << " " << (UCs[0].getOpInfo() ? "w/o" : "w")
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<< " error code";
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break;
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}
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outs() << "\n";
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}
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static void printAllUnwindCodes(ArrayRef<UnwindCode> UCs) {
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for (const UnwindCode *I = UCs.begin(), *E = UCs.end(); I < E; ) {
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unsigned UsedSlots = getNumUsedSlots(*I);
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if (UsedSlots > UCs.size()) {
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outs() << "Unwind data corrupted: Encountered unwind op "
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<< getUnwindCodeTypeName((*I).getUnwindOp())
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<< " which requires " << UsedSlots
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<< " slots, but only " << UCs.size()
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<< " remaining in buffer";
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return ;
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}
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printUnwindCode(ArrayRef<UnwindCode>(I, E));
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I += UsedSlots;
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}
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}
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// Given a symbol sym this functions returns the address and section of it.
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static std::error_code
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resolveSectionAndAddress(const COFFObjectFile *Obj, const SymbolRef &Sym,
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const coff_section *&ResolvedSection,
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uint64_t &ResolvedAddr) {
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if (std::error_code EC = Sym.getAddress(ResolvedAddr))
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return EC;
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section_iterator iter(Obj->section_begin());
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if (std::error_code EC = Sym.getSection(iter))
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return EC;
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ResolvedSection = Obj->getCOFFSection(*iter);
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return object_error::success;
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}
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// Given a vector of relocations for a section and an offset into this section
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// the function returns the symbol used for the relocation at the offset.
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static std::error_code resolveSymbol(const std::vector<RelocationRef> &Rels,
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uint64_t Offset, SymbolRef &Sym) {
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for (std::vector<RelocationRef>::const_iterator I = Rels.begin(),
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E = Rels.end();
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I != E; ++I) {
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uint64_t Ofs;
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if (std::error_code EC = I->getOffset(Ofs))
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return EC;
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if (Ofs == Offset) {
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Sym = *I->getSymbol();
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return object_error::success;
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}
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}
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return object_error::parse_failed;
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}
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// Given a vector of relocations for a section and an offset into this section
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// the function resolves the symbol used for the relocation at the offset and
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// returns the section content and the address inside the content pointed to
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// by the symbol.
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static std::error_code
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getSectionContents(const COFFObjectFile *Obj,
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const std::vector<RelocationRef> &Rels, uint64_t Offset,
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ArrayRef<uint8_t> &Contents, uint64_t &Addr) {
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SymbolRef Sym;
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if (std::error_code EC = resolveSymbol(Rels, Offset, Sym))
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return EC;
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const coff_section *Section;
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if (std::error_code EC = resolveSectionAndAddress(Obj, Sym, Section, Addr))
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return EC;
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if (std::error_code EC = Obj->getSectionContents(Section, Contents))
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return EC;
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return object_error::success;
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}
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// Given a vector of relocations for a section and an offset into this section
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// the function returns the name of the symbol used for the relocation at the
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// offset.
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static std::error_code resolveSymbolName(const std::vector<RelocationRef> &Rels,
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uint64_t Offset, StringRef &Name) {
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SymbolRef Sym;
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if (std::error_code EC = resolveSymbol(Rels, Offset, Sym))
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return EC;
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if (std::error_code EC = Sym.getName(Name))
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return EC;
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return object_error::success;
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}
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static void printCOFFSymbolAddress(llvm::raw_ostream &Out,
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const std::vector<RelocationRef> &Rels,
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uint64_t Offset, uint32_t Disp) {
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StringRef Sym;
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if (!resolveSymbolName(Rels, Offset, Sym)) {
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Out << Sym;
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if (Disp > 0)
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Out << format(" + 0x%04x", Disp);
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} else {
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Out << format("0x%04x", Disp);
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}
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}
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static void
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printSEHTable(const COFFObjectFile *Obj, uint32_t TableVA, int Count) {
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if (Count == 0)
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return;
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const pe32_header *PE32Header;
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if (error(Obj->getPE32Header(PE32Header)))
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return;
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uint32_t ImageBase = PE32Header->ImageBase;
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uintptr_t IntPtr = 0;
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if (error(Obj->getVaPtr(TableVA, IntPtr)))
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return;
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const support::ulittle32_t *P = (const support::ulittle32_t *)IntPtr;
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outs() << "SEH Table:";
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for (int I = 0; I < Count; ++I)
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outs() << format(" 0x%x", P[I] + ImageBase);
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outs() << "\n\n";
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}
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static void printLoadConfiguration(const COFFObjectFile *Obj) {
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// Skip if it's not executable.
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const pe32_header *PE32Header;
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if (error(Obj->getPE32Header(PE32Header)))
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return;
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if (!PE32Header)
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return;
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const coff_file_header *Header;
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if (error(Obj->getCOFFHeader(Header)))
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return;
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// Currently only x86 is supported
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if (Header->Machine != COFF::IMAGE_FILE_MACHINE_I386)
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return;
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const data_directory *DataDir;
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if (error(Obj->getDataDirectory(COFF::LOAD_CONFIG_TABLE, DataDir)))
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return;
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uintptr_t IntPtr = 0;
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if (DataDir->RelativeVirtualAddress == 0)
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return;
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if (error(Obj->getRvaPtr(DataDir->RelativeVirtualAddress, IntPtr)))
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return;
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auto *LoadConf = reinterpret_cast<const coff_load_configuration32 *>(IntPtr);
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outs() << "Load configuration:"
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<< "\n Timestamp: " << LoadConf->TimeDateStamp
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<< "\n Major Version: " << LoadConf->MajorVersion
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<< "\n Minor Version: " << LoadConf->MinorVersion
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<< "\n GlobalFlags Clear: " << LoadConf->GlobalFlagsClear
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<< "\n GlobalFlags Set: " << LoadConf->GlobalFlagsSet
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<< "\n Critical Section Default Timeout: " << LoadConf->CriticalSectionDefaultTimeout
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<< "\n Decommit Free Block Threshold: " << LoadConf->DeCommitFreeBlockThreshold
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<< "\n Decommit Total Free Threshold: " << LoadConf->DeCommitTotalFreeThreshold
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<< "\n Lock Prefix Table: " << LoadConf->LockPrefixTable
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<< "\n Maximum Allocation Size: " << LoadConf->MaximumAllocationSize
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<< "\n Virtual Memory Threshold: " << LoadConf->VirtualMemoryThreshold
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<< "\n Process Affinity Mask: " << LoadConf->ProcessAffinityMask
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<< "\n Process Heap Flags: " << LoadConf->ProcessHeapFlags
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<< "\n CSD Version: " << LoadConf->CSDVersion
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<< "\n Security Cookie: " << LoadConf->SecurityCookie
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<< "\n SEH Table: " << LoadConf->SEHandlerTable
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<< "\n SEH Count: " << LoadConf->SEHandlerCount
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<< "\n\n";
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printSEHTable(Obj, LoadConf->SEHandlerTable, LoadConf->SEHandlerCount);
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outs() << "\n";
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}
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// Prints import tables. The import table is a table containing the list of
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// DLL name and symbol names which will be linked by the loader.
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static void printImportTables(const COFFObjectFile *Obj) {
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import_directory_iterator I = Obj->import_directory_begin();
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import_directory_iterator E = Obj->import_directory_end();
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if (I == E)
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return;
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outs() << "The Import Tables:\n";
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for (; I != E; I = ++I) {
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const import_directory_table_entry *Dir;
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StringRef Name;
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if (I->getImportTableEntry(Dir)) return;
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if (I->getName(Name)) return;
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outs() << format(" lookup %08x time %08x fwd %08x name %08x addr %08x\n\n",
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static_cast<uint32_t>(Dir->ImportLookupTableRVA),
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static_cast<uint32_t>(Dir->TimeDateStamp),
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static_cast<uint32_t>(Dir->ForwarderChain),
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static_cast<uint32_t>(Dir->NameRVA),
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static_cast<uint32_t>(Dir->ImportAddressTableRVA));
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outs() << " DLL Name: " << Name << "\n";
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outs() << " Hint/Ord Name\n";
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const import_lookup_table_entry32 *entry;
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if (I->getImportLookupEntry(entry))
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return;
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for (; entry->data; ++entry) {
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if (entry->isOrdinal()) {
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outs() << format(" % 6d\n", entry->getOrdinal());
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continue;
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}
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uint16_t Hint;
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StringRef Name;
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if (Obj->getHintName(entry->getHintNameRVA(), Hint, Name))
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return;
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outs() << format(" % 6d ", Hint) << Name << "\n";
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}
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outs() << "\n";
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}
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}
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// Prints export tables. The export table is a table containing the list of
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// exported symbol from the DLL.
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static void printExportTable(const COFFObjectFile *Obj) {
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outs() << "Export Table:\n";
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export_directory_iterator I = Obj->export_directory_begin();
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export_directory_iterator E = Obj->export_directory_end();
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if (I == E)
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return;
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StringRef DllName;
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uint32_t OrdinalBase;
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if (I->getDllName(DllName))
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return;
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if (I->getOrdinalBase(OrdinalBase))
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return;
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outs() << " DLL name: " << DllName << "\n";
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outs() << " Ordinal base: " << OrdinalBase << "\n";
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outs() << " Ordinal RVA Name\n";
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for (; I != E; I = ++I) {
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uint32_t Ordinal;
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if (I->getOrdinal(Ordinal))
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return;
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uint32_t RVA;
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if (I->getExportRVA(RVA))
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return;
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outs() << format(" % 4d %# 8x", Ordinal, RVA);
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StringRef Name;
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if (I->getSymbolName(Name))
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continue;
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if (!Name.empty())
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outs() << " " << Name;
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outs() << "\n";
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}
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}
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// Given the COFF object file, this function returns the relocations for .pdata
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// and the pointer to "runtime function" structs.
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static bool getPDataSection(const COFFObjectFile *Obj,
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std::vector<RelocationRef> &Rels,
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const RuntimeFunction *&RFStart, int &NumRFs) {
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for (const SectionRef &Section : Obj->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")
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continue;
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const coff_section *Pdata = Obj->getCOFFSection(Section);
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for (const RelocationRef &Reloc : Section.relocations())
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Rels.push_back(Reloc);
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// Sort relocations by address.
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std::sort(Rels.begin(), Rels.end(), RelocAddressLess);
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ArrayRef<uint8_t> Contents;
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if (error(Obj->getSectionContents(Pdata, Contents)))
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continue;
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if (Contents.empty())
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continue;
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RFStart = reinterpret_cast<const RuntimeFunction *>(Contents.data());
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NumRFs = Contents.size() / sizeof(RuntimeFunction);
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return true;
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}
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return false;
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}
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static void printWin64EHUnwindInfo(const Win64EH::UnwindInfo *UI) {
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// The casts to int are required in order to output the value as number.
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// Without the casts the value would be interpreted as char data (which
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// results in garbage output).
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outs() << " Version: " << static_cast<int>(UI->getVersion()) << "\n";
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outs() << " Flags: " << static_cast<int>(UI->getFlags());
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if (UI->getFlags()) {
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if (UI->getFlags() & UNW_ExceptionHandler)
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outs() << " UNW_ExceptionHandler";
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if (UI->getFlags() & UNW_TerminateHandler)
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outs() << " UNW_TerminateHandler";
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if (UI->getFlags() & UNW_ChainInfo)
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outs() << " UNW_ChainInfo";
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}
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outs() << "\n";
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outs() << " Size of prolog: " << static_cast<int>(UI->PrologSize) << "\n";
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outs() << " Number of Codes: " << static_cast<int>(UI->NumCodes) << "\n";
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// Maybe this should move to output of UOP_SetFPReg?
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if (UI->getFrameRegister()) {
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outs() << " Frame register: "
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<< getUnwindRegisterName(UI->getFrameRegister()) << "\n";
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outs() << " Frame offset: " << 16 * UI->getFrameOffset() << "\n";
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} else {
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outs() << " No frame pointer used\n";
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}
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if (UI->getFlags() & (UNW_ExceptionHandler | UNW_TerminateHandler)) {
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// FIXME: Output exception handler data
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} else if (UI->getFlags() & UNW_ChainInfo) {
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// FIXME: Output chained unwind info
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}
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if (UI->NumCodes)
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outs() << " Unwind Codes:\n";
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printAllUnwindCodes(ArrayRef<UnwindCode>(&UI->UnwindCodes[0], UI->NumCodes));
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outs() << "\n";
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outs().flush();
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}
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/// Prints out the given RuntimeFunction struct for x64, assuming that Obj is
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/// pointing to an executable file.
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static void printRuntimeFunction(const COFFObjectFile *Obj,
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const RuntimeFunction &RF) {
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if (!RF.StartAddress)
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return;
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outs() << "Function Table:\n"
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<< format(" Start Address: 0x%04x\n",
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static_cast<uint32_t>(RF.StartAddress))
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<< format(" End Address: 0x%04x\n",
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static_cast<uint32_t>(RF.EndAddress))
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<< format(" Unwind Info Address: 0x%04x\n",
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static_cast<uint32_t>(RF.UnwindInfoOffset));
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uintptr_t addr;
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if (Obj->getRvaPtr(RF.UnwindInfoOffset, addr))
|
|
return;
|
|
printWin64EHUnwindInfo(reinterpret_cast<const Win64EH::UnwindInfo *>(addr));
|
|
}
|
|
|
|
/// Prints out the given RuntimeFunction struct for x64, assuming that Obj is
|
|
/// pointing to an object file. Unlike executable, fields in RuntimeFunction
|
|
/// struct are filled with zeros, but instead there are relocations pointing to
|
|
/// them so that the linker will fill targets' RVAs to the fields at link
|
|
/// time. This function interprets the relocations to find the data to be used
|
|
/// in the resulting executable.
|
|
static void printRuntimeFunctionRels(const COFFObjectFile *Obj,
|
|
const RuntimeFunction &RF,
|
|
uint64_t SectionOffset,
|
|
const std::vector<RelocationRef> &Rels) {
|
|
outs() << "Function Table:\n";
|
|
outs() << " Start Address: ";
|
|
printCOFFSymbolAddress(outs(), Rels,
|
|
SectionOffset +
|
|
/*offsetof(RuntimeFunction, StartAddress)*/ 0,
|
|
RF.StartAddress);
|
|
outs() << "\n";
|
|
|
|
outs() << " End Address: ";
|
|
printCOFFSymbolAddress(outs(), Rels,
|
|
SectionOffset +
|
|
/*offsetof(RuntimeFunction, EndAddress)*/ 4,
|
|
RF.EndAddress);
|
|
outs() << "\n";
|
|
|
|
outs() << " Unwind Info Address: ";
|
|
printCOFFSymbolAddress(outs(), Rels,
|
|
SectionOffset +
|
|
/*offsetof(RuntimeFunction, UnwindInfoOffset)*/ 8,
|
|
RF.UnwindInfoOffset);
|
|
outs() << "\n";
|
|
|
|
ArrayRef<uint8_t> XContents;
|
|
uint64_t UnwindInfoOffset = 0;
|
|
if (error(getSectionContents(
|
|
Obj, Rels, SectionOffset +
|
|
/*offsetof(RuntimeFunction, UnwindInfoOffset)*/ 8,
|
|
XContents, UnwindInfoOffset)))
|
|
return;
|
|
if (XContents.empty())
|
|
return;
|
|
|
|
UnwindInfoOffset += RF.UnwindInfoOffset;
|
|
if (UnwindInfoOffset > XContents.size())
|
|
return;
|
|
|
|
auto *UI = reinterpret_cast<const Win64EH::UnwindInfo *>(XContents.data() +
|
|
UnwindInfoOffset);
|
|
printWin64EHUnwindInfo(UI);
|
|
}
|
|
|
|
void llvm::printCOFFUnwindInfo(const COFFObjectFile *Obj) {
|
|
const coff_file_header *Header;
|
|
if (error(Obj->getCOFFHeader(Header)))
|
|
return;
|
|
|
|
if (Header->Machine != COFF::IMAGE_FILE_MACHINE_AMD64) {
|
|
errs() << "Unsupported image machine type "
|
|
"(currently only AMD64 is supported).\n";
|
|
return;
|
|
}
|
|
|
|
std::vector<RelocationRef> Rels;
|
|
const RuntimeFunction *RFStart;
|
|
int NumRFs;
|
|
if (!getPDataSection(Obj, Rels, RFStart, NumRFs))
|
|
return;
|
|
ArrayRef<RuntimeFunction> RFs(RFStart, NumRFs);
|
|
|
|
bool IsExecutable = Rels.empty();
|
|
if (IsExecutable) {
|
|
for (const RuntimeFunction &RF : RFs)
|
|
printRuntimeFunction(Obj, RF);
|
|
return;
|
|
}
|
|
|
|
for (const RuntimeFunction &RF : RFs) {
|
|
uint64_t SectionOffset =
|
|
std::distance(RFs.begin(), &RF) * sizeof(RuntimeFunction);
|
|
printRuntimeFunctionRels(Obj, RF, SectionOffset, Rels);
|
|
}
|
|
}
|
|
|
|
void llvm::printCOFFFileHeader(const object::ObjectFile *Obj) {
|
|
const COFFObjectFile *file = dyn_cast<const COFFObjectFile>(Obj);
|
|
printLoadConfiguration(file);
|
|
printImportTables(file);
|
|
printExportTable(file);
|
|
}
|