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246 lines
8.1 KiB
C++
246 lines
8.1 KiB
C++
//===--- DwarfCFIEHPrinter.h - DWARF-based Unwind Information Printer -----===//
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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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#ifndef LLVM_TOOLS_LLVM_READOBJ_DWARFCFIEHPRINTER_H
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#define LLVM_TOOLS_LLVM_READOBJ_DWARFCFIEHPRINTER_H
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#include "Error.h"
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#include "llvm-readobj.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/BinaryFormat/Dwarf.h"
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#include "llvm/Object/ELF.h"
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#include "llvm/Object/ELFTypes.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/ScopedPrinter.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
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#include "llvm/DebugInfo/DWARF/DWARFDebugFrame.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/type_traits.h"
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namespace llvm {
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namespace DwarfCFIEH {
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template <typename ELFT>
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class PrinterContext {
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ScopedPrinter &W;
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const object::ELFFile<ELFT> *Obj;
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void printEHFrameHdr(uint64_t Offset, uint64_t Address, uint64_t Size) const;
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void printEHFrame(const typename ELFT::Shdr *EHFrameShdr) const;
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public:
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PrinterContext(ScopedPrinter &W, const object::ELFFile<ELFT> *Obj)
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: W(W), Obj(Obj) {}
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void printUnwindInformation() const;
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};
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template <class ELFO>
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static const typename ELFO::Elf_Shdr *findSectionByAddress(const ELFO *Obj,
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uint64_t Addr) {
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auto Sections = Obj->sections();
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if (Error E = Sections.takeError())
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reportError(toString(std::move(E)));
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for (const auto &Shdr : *Sections)
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if (Shdr.sh_addr == Addr)
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return &Shdr;
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return nullptr;
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}
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template <typename ELFT>
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void PrinterContext<ELFT>::printUnwindInformation() const {
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const typename ELFT::Phdr *EHFramePhdr = nullptr;
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auto PHs = Obj->program_headers();
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if (Error E = PHs.takeError())
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reportError(toString(std::move(E)));
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for (const auto &Phdr : *PHs) {
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if (Phdr.p_type == ELF::PT_GNU_EH_FRAME) {
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EHFramePhdr = &Phdr;
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if (Phdr.p_memsz != Phdr.p_filesz)
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reportError("p_memsz does not match p_filesz for GNU_EH_FRAME");
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break;
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}
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}
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if (EHFramePhdr)
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printEHFrameHdr(EHFramePhdr->p_offset, EHFramePhdr->p_vaddr,
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EHFramePhdr->p_memsz);
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auto Sections = Obj->sections();
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if (Error E = Sections.takeError())
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reportError(toString(std::move(E)));
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for (const auto &Shdr : *Sections) {
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auto SectionName = Obj->getSectionName(&Shdr);
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if (Error E = SectionName.takeError())
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reportError(toString(std::move(E)));
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if (*SectionName == ".eh_frame")
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printEHFrame(&Shdr);
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}
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}
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template <typename ELFT>
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void PrinterContext<ELFT>::printEHFrameHdr(uint64_t EHFrameHdrOffset,
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uint64_t EHFrameHdrAddress,
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uint64_t EHFrameHdrSize) const {
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ListScope L(W, "EH_FRAME Header");
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W.startLine() << format("Address: 0x%" PRIx64 "\n", EHFrameHdrAddress);
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W.startLine() << format("Offset: 0x%" PRIx64 "\n", EHFrameHdrOffset);
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W.startLine() << format("Size: 0x%" PRIx64 "\n", EHFrameHdrSize);
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const auto *EHFrameHdrShdr = findSectionByAddress(Obj, EHFrameHdrAddress);
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if (EHFrameHdrShdr) {
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auto SectionName = Obj->getSectionName(EHFrameHdrShdr);
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if (Error E = SectionName.takeError())
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reportError(toString(std::move(E)));
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W.printString("Corresponding Section", *SectionName);
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}
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DataExtractor DE(
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StringRef(reinterpret_cast<const char *>(Obj->base()) + EHFrameHdrOffset,
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EHFrameHdrSize),
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ELFT::TargetEndianness == support::endianness::little,
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ELFT::Is64Bits ? 8 : 4);
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DictScope D(W, "Header");
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uint32_t Offset = 0;
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auto Version = DE.getU8(&Offset);
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W.printNumber("version", Version);
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if (Version != 1)
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reportError("only version 1 of .eh_frame_hdr is supported");
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uint64_t EHFramePtrEnc = DE.getU8(&Offset);
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W.startLine() << format("eh_frame_ptr_enc: 0x%" PRIx64 "\n", EHFramePtrEnc);
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if (EHFramePtrEnc != (dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4))
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reportError("unexpected encoding eh_frame_ptr_enc");
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uint64_t FDECountEnc = DE.getU8(&Offset);
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W.startLine() << format("fde_count_enc: 0x%" PRIx64 "\n", FDECountEnc);
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if (FDECountEnc != dwarf::DW_EH_PE_udata4)
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reportError("unexpected encoding fde_count_enc");
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uint64_t TableEnc = DE.getU8(&Offset);
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W.startLine() << format("table_enc: 0x%" PRIx64 "\n", TableEnc);
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if (TableEnc != (dwarf::DW_EH_PE_datarel | dwarf::DW_EH_PE_sdata4))
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reportError("unexpected encoding table_enc");
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auto EHFramePtr = DE.getSigned(&Offset, 4) + EHFrameHdrAddress + 4;
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W.startLine() << format("eh_frame_ptr: 0x%" PRIx64 "\n", EHFramePtr);
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auto FDECount = DE.getUnsigned(&Offset, 4);
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W.printNumber("fde_count", FDECount);
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unsigned NumEntries = 0;
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uint64_t PrevPC = 0;
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while (Offset + 8 <= EHFrameHdrSize && NumEntries < FDECount) {
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DictScope D(W, std::string("entry ") + std::to_string(NumEntries));
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auto InitialPC = DE.getSigned(&Offset, 4) + EHFrameHdrAddress;
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W.startLine() << format("initial_location: 0x%" PRIx64 "\n", InitialPC);
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auto Address = DE.getSigned(&Offset, 4) + EHFrameHdrAddress;
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W.startLine() << format("address: 0x%" PRIx64 "\n", Address);
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if (InitialPC < PrevPC)
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reportError("initial_location is out of order");
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PrevPC = InitialPC;
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++NumEntries;
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}
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}
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template <typename ELFT>
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void PrinterContext<ELFT>::printEHFrame(
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const typename ELFT::Shdr *EHFrameShdr) const {
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uint64_t Address = EHFrameShdr->sh_addr;
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uint64_t ShOffset = EHFrameShdr->sh_offset;
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W.startLine() << format(".eh_frame section at offset 0x%" PRIx64
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" address 0x%" PRIx64 ":\n",
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ShOffset, Address);
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W.indent();
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auto Result = Obj->getSectionContents(EHFrameShdr);
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if (Error E = Result.takeError())
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reportError(toString(std::move(E)));
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auto Contents = Result.get();
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DWARFDataExtractor DE(
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StringRef(reinterpret_cast<const char *>(Contents.data()),
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Contents.size()),
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ELFT::TargetEndianness == support::endianness::little,
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ELFT::Is64Bits ? 8 : 4);
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DWARFDebugFrame EHFrame(/*IsEH=*/true, /*EHFrameAddress=*/Address);
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EHFrame.parse(DE);
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for (const auto &Entry : EHFrame) {
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if (const auto *CIE = dyn_cast<dwarf::CIE>(&Entry)) {
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W.startLine() << format("[0x%" PRIx64 "] CIE length=%" PRIu64 "\n",
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Address + CIE->getOffset(),
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CIE->getLength());
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W.indent();
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W.printNumber("version", CIE->getVersion());
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W.printString("augmentation", CIE->getAugmentationString());
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W.printNumber("code_alignment_factor", CIE->getCodeAlignmentFactor());
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W.printNumber("data_alignment_factor", CIE->getDataAlignmentFactor());
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W.printNumber("return_address_register", CIE->getReturnAddressRegister());
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W.getOStream() << "\n";
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W.startLine() << "Program:\n";
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W.indent();
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CIE->cfis().dump(W.getOStream(), nullptr, W.getIndentLevel());
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W.unindent();
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W.unindent();
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W.getOStream() << "\n";
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} else if (const auto *FDE = dyn_cast<dwarf::FDE>(&Entry)) {
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W.startLine() << format("[0x%" PRIx64 "] FDE length=%" PRIu64
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" cie=[0x%" PRIx64 "]\n",
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Address + FDE->getOffset(),
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FDE->getLength(),
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Address + FDE->getLinkedCIE()->getOffset());
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W.indent();
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W.startLine() << format("initial_location: 0x%" PRIx64 "\n",
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FDE->getInitialLocation());
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W.startLine()
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<< format("address_range: 0x%" PRIx64 " (end : 0x%" PRIx64 ")\n",
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FDE->getAddressRange(),
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FDE->getInitialLocation() + FDE->getAddressRange());
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W.getOStream() << "\n";
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W.startLine() << "Program:\n";
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W.indent();
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FDE->cfis().dump(W.getOStream(), nullptr, W.getIndentLevel());
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W.unindent();
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W.unindent();
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W.getOStream() << "\n";
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} else {
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llvm_unreachable("unexpected DWARF frame kind");
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}
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}
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W.unindent();
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}
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}
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}
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#endif
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