mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 12:12:47 +01:00
ae65e281f3
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
262 lines
9.3 KiB
C++
262 lines
9.3 KiB
C++
//===-- ELFDump.cpp - ELF-specific dumper -----------------------*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
///
|
|
/// \file
|
|
/// This file implements the ELF-specific dumper for llvm-objdump.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm-objdump.h"
|
|
#include "llvm/Demangle/Demangle.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>
|
|
static std::error_code getRelocationValueString(const ELFObjectFile<ELFT> *Obj,
|
|
const RelocationRef &RelRef,
|
|
SmallVectorImpl<char> &Result) {
|
|
typedef typename ELFObjectFile<ELFT>::Elf_Sym Elf_Sym;
|
|
typedef typename ELFObjectFile<ELFT>::Elf_Shdr Elf_Shdr;
|
|
typedef typename ELFObjectFile<ELFT>::Elf_Rela Elf_Rela;
|
|
|
|
const ELFFile<ELFT> &EF = *Obj->getELFFile();
|
|
DataRefImpl Rel = RelRef.getRawDataRefImpl();
|
|
auto SecOrErr = EF.getSection(Rel.d.a);
|
|
if (!SecOrErr)
|
|
return errorToErrorCode(SecOrErr.takeError());
|
|
|
|
int64_t Addend = 0;
|
|
// If there is no Symbol associated with the relocation, we set the undef
|
|
// boolean value to 'true'. This will prevent us from calling functions that
|
|
// requires the relocation to be associated with a symbol.
|
|
//
|
|
// In SHT_REL case we would need to read the addend from section data.
|
|
// GNU objdump does not do that and we just follow for simplicity atm.
|
|
bool Undef = false;
|
|
if ((*SecOrErr)->sh_type == ELF::SHT_RELA) {
|
|
const Elf_Rela *ERela = Obj->getRela(Rel);
|
|
Addend = ERela->r_addend;
|
|
Undef = ERela->getSymbol(false) == 0;
|
|
} else if ((*SecOrErr)->sh_type != ELF::SHT_REL) {
|
|
return object_error::parse_failed;
|
|
}
|
|
|
|
// Default scheme is to print Target, as well as "+ <addend>" for nonzero
|
|
// addend. Should be acceptable for all normal purposes.
|
|
std::string FmtBuf;
|
|
raw_string_ostream Fmt(FmtBuf);
|
|
|
|
if (!Undef) {
|
|
symbol_iterator SI = RelRef.getSymbol();
|
|
const Elf_Sym *Sym = Obj->getSymbol(SI->getRawDataRefImpl());
|
|
if (Sym->getType() == ELF::STT_SECTION) {
|
|
Expected<section_iterator> SymSI = SI->getSection();
|
|
if (!SymSI)
|
|
return errorToErrorCode(SymSI.takeError());
|
|
const Elf_Shdr *SymSec = Obj->getSection((*SymSI)->getRawDataRefImpl());
|
|
auto SecName = EF.getSectionName(SymSec);
|
|
if (!SecName)
|
|
return errorToErrorCode(SecName.takeError());
|
|
Fmt << *SecName;
|
|
} else {
|
|
Expected<StringRef> SymName = SI->getName();
|
|
if (!SymName)
|
|
return errorToErrorCode(SymName.takeError());
|
|
if (Demangle)
|
|
Fmt << demangle(*SymName);
|
|
else
|
|
Fmt << *SymName;
|
|
}
|
|
} else {
|
|
Fmt << "*ABS*";
|
|
}
|
|
|
|
if (Addend != 0)
|
|
Fmt << (Addend < 0 ? "" : "+") << Addend;
|
|
Fmt.flush();
|
|
Result.append(FmtBuf.begin(), FmtBuf.end());
|
|
return std::error_code();
|
|
}
|
|
|
|
std::error_code
|
|
llvm::getELFRelocationValueString(const ELFObjectFileBase *Obj,
|
|
const RelocationRef &Rel,
|
|
SmallVectorImpl<char> &Result) {
|
|
if (auto *ELF32LE = dyn_cast<ELF32LEObjectFile>(Obj))
|
|
return getRelocationValueString(ELF32LE, Rel, Result);
|
|
if (auto *ELF64LE = dyn_cast<ELF64LEObjectFile>(Obj))
|
|
return getRelocationValueString(ELF64LE, Rel, Result);
|
|
if (auto *ELF32BE = dyn_cast<ELF32BEObjectFile>(Obj))
|
|
return getRelocationValueString(ELF32BE, Rel, Result);
|
|
auto *ELF64BE = cast<ELF64BEObjectFile>(Obj);
|
|
return getRelocationValueString(ELF64BE, Rel, Result);
|
|
}
|
|
|
|
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) {
|
|
if (const auto *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
|
|
printProgramHeaders(ELFObj->getELFFile());
|
|
else if (const auto *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
|
|
printProgramHeaders(ELFObj->getELFFile());
|
|
else if (const auto *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
|
|
printProgramHeaders(ELFObj->getELFFile());
|
|
else if (const auto *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
|
|
printProgramHeaders(ELFObj->getELFFile());
|
|
}
|
|
|
|
void llvm::printELFDynamicSection(const object::ObjectFile *Obj) {
|
|
if (const auto *ELFObj = dyn_cast<ELF32LEObjectFile>(Obj))
|
|
printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
|
|
else if (const auto *ELFObj = dyn_cast<ELF32BEObjectFile>(Obj))
|
|
printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
|
|
else if (const auto *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj))
|
|
printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
|
|
else if (const auto *ELFObj = dyn_cast<ELF64BEObjectFile>(Obj))
|
|
printDynamicSection(ELFObj->getELFFile(), Obj->getFileName());
|
|
}
|