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//===-- ELFDump.cpp - ELF-specific dumper -----------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements the ELF-specific dumper for llvm-objdump.
///
//===----------------------------------------------------------------------===//
#include "llvm-objdump.h"
#include "llvm/Object/ELFObjectFile.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
using namespace llvm::object;
template <class ELFT>
Expected<StringRef> getDynamicStrTab(const ELFFile<ELFT> *Elf) {
typedef ELFFile<ELFT> ELFO;
auto DynamicEntriesOrError = Elf->dynamicEntries();
if (!DynamicEntriesOrError)
return DynamicEntriesOrError.takeError();
for (const typename ELFO::Elf_Dyn &Dyn : *DynamicEntriesOrError) {
if (Dyn.d_tag == ELF::DT_STRTAB) {
auto MappedAddrOrError = Elf->toMappedAddr(Dyn.getPtr());
if (!MappedAddrOrError)
consumeError(MappedAddrOrError.takeError());
return StringRef(reinterpret_cast<const char *>(*MappedAddrOrError));
}
}
// If the dynamic segment is not present, we fall back on the sections.
auto SectionsOrError = Elf->sections();
if (!SectionsOrError)
return SectionsOrError.takeError();
for (const typename ELFO::Elf_Shdr &Sec : *SectionsOrError) {
if (Sec.sh_type == ELF::SHT_DYNSYM)
return Elf->getStringTableForSymtab(Sec);
}
return createError("dynamic string table not found");
}
template <class ELFT>
void printDynamicSection(const ELFFile<ELFT> *Elf, StringRef Filename) {
auto ProgramHeaderOrError = Elf->program_headers();
if (!ProgramHeaderOrError)
report_error(Filename, ProgramHeaderOrError.takeError());
auto DynamicEntriesOrError = Elf->dynamicEntries();
if (!DynamicEntriesOrError)
report_error(Filename, DynamicEntriesOrError.takeError());
outs() << "Dynamic Section:\n";
for (const auto &Dyn : *DynamicEntriesOrError) {
if (Dyn.d_tag == ELF::DT_NULL)
continue;
StringRef Str = StringRef(Elf->getDynamicTagAsString(Dyn.d_tag));
if (Str.empty()) {
std::string HexStr = utohexstr(static_cast<uint64_t>(Dyn.d_tag), true);
outs() << format(" 0x%-19s", HexStr.c_str());
} else {
// We use "-21" in order to match GNU objdump's output.
outs() << format(" %-21s", Str.data());
}
const char *Fmt =
ELFT::Is64Bits ? "0x%016" PRIx64 "\n" : "0x%08" PRIx64 "\n";
if (Dyn.d_tag == ELF::DT_NEEDED) {
Expected<StringRef> StrTabOrErr = getDynamicStrTab(Elf);
if (StrTabOrErr) {
const char *Data = StrTabOrErr.get().data();
outs() << (Data + Dyn.d_un.d_val) << "\n";
continue;
}
warn(errorToErrorCode(StrTabOrErr.takeError()).message());
consumeError(StrTabOrErr.takeError());
}
outs() << format(Fmt, (uint64_t)Dyn.d_un.d_val);
}
}
template <class ELFT> void printProgramHeaders(const ELFFile<ELFT> *o) {
typedef ELFFile<ELFT> ELFO;
outs() << "Program Header:\n";
auto ProgramHeaderOrError = o->program_headers();
if (!ProgramHeaderOrError)
report_fatal_error(
errorToErrorCode(ProgramHeaderOrError.takeError()).message());
for (const typename ELFO::Elf_Phdr &Phdr : *ProgramHeaderOrError) {
switch (Phdr.p_type) {
case ELF::PT_DYNAMIC:
outs() << " DYNAMIC ";
break;
case ELF::PT_GNU_EH_FRAME:
outs() << "EH_FRAME ";
break;
case ELF::PT_GNU_RELRO:
outs() << " RELRO ";
break;
case ELF::PT_GNU_STACK:
outs() << " STACK ";
break;
case ELF::PT_INTERP:
outs() << " INTERP ";
break;
case ELF::PT_LOAD:
outs() << " LOAD ";
break;
case ELF::PT_NOTE:
outs() << " NOTE ";
break;
case ELF::PT_OPENBSD_BOOTDATA:
outs() << " OPENBSD_BOOTDATA ";
break;
case ELF::PT_OPENBSD_RANDOMIZE:
outs() << " OPENBSD_RANDOMIZE ";
break;
case ELF::PT_OPENBSD_WXNEEDED:
outs() << " OPENBSD_WXNEEDED ";
break;
case ELF::PT_PHDR:
outs() << " PHDR ";
break;
case ELF::PT_TLS:
outs() << " TLS ";
break;
default:
outs() << " UNKNOWN ";
}
const char *Fmt = ELFT::Is64Bits ? "0x%016" PRIx64 " " : "0x%08" PRIx64 " ";
outs() << "off " << format(Fmt, (uint64_t)Phdr.p_offset) << "vaddr "
<< format(Fmt, (uint64_t)Phdr.p_vaddr) << "paddr "
<< format(Fmt, (uint64_t)Phdr.p_paddr)
<< format("align 2**%u\n",
countTrailingZeros<uint64_t>(Phdr.p_align))
<< " filesz " << format(Fmt, (uint64_t)Phdr.p_filesz)
<< "memsz " << format(Fmt, (uint64_t)Phdr.p_memsz) << "flags "
<< ((Phdr.p_flags & ELF::PF_R) ? "r" : "-")
<< ((Phdr.p_flags & ELF::PF_W) ? "w" : "-")
<< ((Phdr.p_flags & ELF::PF_X) ? "x" : "-") << "\n";
}
outs() << "\n";
}
void llvm::printELFFileHeader(const object::ObjectFile *Obj) {
// Little-endian 32-bit
if (const ELF32LEObjectFile *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
printProgramHeaders(ELFObj->getELFFile());
// Big-endian 32-bit
if (const ELF32BEObjectFile *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
printProgramHeaders(ELFObj->getELFFile());
// Little-endian 64-bit
if (const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
printProgramHeaders(ELFObj->getELFFile());
// Big-endian 64-bit
if (const ELF64BEObjectFile *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
printProgramHeaders(ELFObj->getELFFile());
}
void llvm::printELFDynamicSection(const object::ObjectFile *Obj) {
// Little-endian 32-bit
if (const ELF32LEObjectFile *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
// Big-endian 32-bit
if (const ELF32BEObjectFile *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
// Little-endian 64-bit
if (const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
// Big-endian 64-bit
if (const ELF64BEObjectFile *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
}