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[llvm-objdump] Add dynamic section printing to private-headers option

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Differential Revision: https://reviews.llvm.org/D49016

llvm-svn: 337902
This commit is contained in:
Paul Semel 2018-07-25 11:09:20 +00:00
parent e5caf328a5
commit 3560e7c201
9 changed files with 335 additions and 2 deletions
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7
include/llvm/Object/ELF.h
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@ -115,6 +115,9 @@ public:
SmallVectorImpl<char> &Result) const;
uint32_t getRelrRelocationType() const;
const char *getDynamicTagAsString(unsigned Arch, uint64_t Type) const;
const char *getDynamicTagAsString(uint64_t Type) const;
/// Get the symbol for a given relocation.
Expected<const Elf_Sym *> getRelocationSymbol(const Elf_Rel *Rel,
const Elf_Shdr *SymTab) const;
@ -133,6 +136,10 @@ public:
Expected<Elf_Shdr_Range> sections() const;
Expected<Elf_Dyn_Range> dynamicEntries() const;
Expected<const uint8_t *> toMappedAddr(uint64_t VAddr) const;
Expected<Elf_Sym_Range> symbols(const Elf_Shdr *Sec) const {
if (!Sec)
return makeArrayRef<Elf_Sym>(nullptr, nullptr);

138
lib/Object/ELF.cpp
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@ -420,6 +420,144 @@ ELFFile<ELFT>::android_relas(const Elf_Shdr *Sec) const {
return Relocs;
}
template <class ELFT>
const char *ELFFile<ELFT>::getDynamicTagAsString(unsigned Arch,
uint64_t Type) const {
#define DYNAMIC_STRINGIFY_ENUM(tag, value) \
case value: \
return #tag;
#define DYNAMIC_TAG(n, v)
switch (Arch) {
case ELF::EM_HEXAGON:
switch (Type) {
#define HEXAGON_DYNAMIC_TAG(name, value) DYNAMIC_STRINGIFY_ENUM(name, value)
#include "llvm/BinaryFormat/DynamicTags.def"
#undef HEXAGON_DYNAMIC_TAG
}
case ELF::EM_MIPS:
switch (Type) {
#define MIPS_DYNAMIC_TAG(name, value) DYNAMIC_STRINGIFY_ENUM(name, value)
#include "llvm/BinaryFormat/DynamicTags.def"
#undef MIPS_DYNAMIC_TAG
}
case ELF::EM_PPC64:
switch (Type) {
#define PPC64_DYNAMIC_TAG(name, value) DYNAMIC_STRINGIFY_ENUM(name, value)
#include "llvm/BinaryFormat/DynamicTags.def"
#undef PPC64_DYNAMIC_TAG
}
}
#undef DYNAMIC_TAG
switch (Type) {
// Now handle all dynamic tags except the architecture specific ones
#define MIPS_DYNAMIC_TAG(name, value)
#define HEXAGON_DYNAMIC_TAG(name, value)
#define PPC64_DYNAMIC_TAG(name, value)
// Also ignore marker tags such as DT_HIOS (maps to DT_VERNEEDNUM), etc.
#define DYNAMIC_TAG_MARKER(name, value)
#define DYNAMIC_TAG(name, value) DYNAMIC_STRINGIFY_ENUM(name, value)
#include "llvm/BinaryFormat/DynamicTags.def"
#undef DYNAMIC_TAG
#undef MIPS_DYNAMIC_TAG
#undef HEXAGON_DYNAMIC_TAG
#undef PPC64_DYNAMIC_TAG
#undef DYNAMIC_TAG_MARKER
#undef DYNAMIC_STRINGIFY_ENUM
default:
return "unknown";
}
}
template <class ELFT>
const char *ELFFile<ELFT>::getDynamicTagAsString(uint64_t Type) const {
return getDynamicTagAsString(getHeader()->e_machine, Type);
}
template <class ELFT>
Expected<typename ELFT::DynRange> ELFFile<ELFT>::dynamicEntries() const {
ArrayRef<Elf_Dyn> Dyn;
size_t DynSecSize = 0;
auto ProgramHeadersOrError = program_headers();
if (!ProgramHeadersOrError)
return ProgramHeadersOrError.takeError();
for (const Elf_Phdr &Phdr : *ProgramHeadersOrError) {
if (Phdr.p_type == ELF::PT_DYNAMIC) {
Dyn = makeArrayRef(
reinterpret_cast<const Elf_Dyn *>(base() + Phdr.p_offset),
Phdr.p_filesz / sizeof(Elf_Dyn));
DynSecSize = Phdr.p_filesz;
break;
}
}
// If we can't find the dynamic section in the program headers, we just fall
// back on the sections.
if (Dyn.empty()) {
auto SectionsOrError = sections();
if (!SectionsOrError)
return SectionsOrError.takeError();
for (const Elf_Shdr &Sec : *SectionsOrError) {
if (Sec.sh_type == ELF::SHT_DYNAMIC) {
Expected<ArrayRef<Elf_Dyn>> DynOrError =
getSectionContentsAsArray<Elf_Dyn>(&Sec);
if (!DynOrError)
return DynOrError.takeError();
Dyn = *DynOrError;
DynSecSize = Sec.sh_size;
break;
}
}
if (!Dyn.data())
return ArrayRef<Elf_Dyn>();
}
if (Dyn.empty())
return createError("invalid empty dynamic section");
if (DynSecSize % sizeof(Elf_Dyn) != 0)
return createError("malformed dynamic section");
if (Dyn.back().d_tag != ELF::DT_NULL)
return createError("dynamic sections must be DT_NULL terminated");
return Dyn;
}
template <class ELFT>
Expected<const uint8_t *> ELFFile<ELFT>::toMappedAddr(uint64_t VAddr) const {
auto ProgramHeadersOrError = program_headers();
if (!ProgramHeadersOrError)
return ProgramHeadersOrError.takeError();
llvm::SmallVector<Elf_Phdr *, 4> LoadSegments;
for (const Elf_Phdr &Phdr : *ProgramHeadersOrError)
if (Phdr.p_type == ELF::PT_LOAD)
LoadSegments.push_back(const_cast<Elf_Phdr *>(&Phdr));
const Elf_Phdr *const *I =
std::upper_bound(LoadSegments.begin(), LoadSegments.end(), VAddr,
[](uint64_t VAddr, const Elf_Phdr_Impl<ELFT> *Phdr) {
return VAddr < Phdr->p_vaddr;
});
if (I == LoadSegments.begin())
return createError("Virtual address is not in any segment");
--I;
const Elf_Phdr &Phdr = **I;
uint64_t Delta = VAddr - Phdr.p_vaddr;
if (Delta >= Phdr.p_filesz)
return createError("Virtual address is not in any segment");
return base() + Phdr.p_offset + Delta;
}
template class llvm::object::ELFFile<ELF32LE>;
template class llvm::object::ELFFile<ELF32BE>;
template class llvm::object::ELFFile<ELF64LE>;

BIN
test/tools/llvm-objdump/Inputs/private-headers-x86_64.elf Executable file
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35
test/tools/llvm-objdump/private-headers-dynamic-section.test Normal file
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@ -0,0 +1,35 @@
# RUN: llvm-objdump -p %p/Inputs/private-headers-x86_64.elf | FileCheck %s
# RUN: llvm-objcopy --strip-sections %p/Inputs/private-headers-x86_64.elf %t
# RUN: llvm-objdump -p %t | FileCheck %s
# CHECK: NEEDED libstdc++.so.6
# CHECK: NEEDED libm.so.6
# CHECK: NEEDED libgcc_s.so.1
# CHECK: NEEDED libc.so.6
# CHECK: INIT 0x00000000000006a0
# CHECK: FINI 0x0000000000000924
# CHECK: INIT_ARRAY 0x0000000000200da8
# CHECK: INIT_ARRAYSZ 0x0000000000000010
# CHECK: FINI_ARRAY 0x0000000000200db8
# CHECK: FINI_ARRAYSZ 0x0000000000000008
# CHECK: GNU_HASH 0x0000000000000298
# CHECK: STRTAB 0x00000000000003c8
# CHECK: SYMTAB 0x00000000000002c0
# CHECK: STRSZ 0x000000000000012f
# CHECK: SYMENT 0x0000000000000018
# CHECK: DEBUG 0x0000000000000000
# CHECK: PLTGOT 0x0000000000201000
# CHECK: PLTRELSZ 0x0000000000000048
# CHECK: PLTREL 0x0000000000000007
# CHECK: JMPREL 0x0000000000000658
# CHECK: RELA 0x0000000000000550
# CHECK: RELASZ 0x0000000000000108
# CHECK: RELAENT 0x0000000000000018
# CHECK: FLAGS_1 0x0000000008000000
# CHECK: VERNEED 0x0000000000000510
# CHECK: VERNEEDNUM 0x0000000000000002
# CHECK: VERSYM 0x00000000000004f8
# CHECK: RELACOUNT 0x0000000000000004
# CHECK: RELRSZ 0x0000000000000014
# CHECK: RELR 0x0000000087654321
# CHECK: RELRENT 0x0000000000000010

42
test/tools/llvm-objdump/private-headers-no-dynamic-segment.test Normal file
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@ -0,0 +1,42 @@
# RUN: yaml2obj %s > %t
# RUN: llvm-objdump -p %t | FileCheck %s
!ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_X86_64
Sections:
- Name: .dynamic
Type: SHT_DYNAMIC
Flags: [ SHF_ALLOC, SHF_WRITE ]
Content: 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
# CHECK: INIT 0x00000000000006a0
# CHECK: FINI 0x0000000000000924
# CHECK: INIT_ARRAY 0x0000000000200da8
# CHECK: INIT_ARRAYSZ 0x0000000000000010
# CHECK: FINI_ARRAY 0x0000000000200db8
# CHECK: FINI_ARRAYSZ 0x0000000000000008
# CHECK: GNU_HASH 0x0000000000000298
# CHECK: STRTAB 0x00000000000003c8
# CHECK: SYMTAB 0x00000000000002c0
# CHECK: STRSZ 0x000000000000012f
# CHECK: SYMENT 0x0000000000000018
# CHECK: DEBUG 0x0000000000000000
# CHECK: PLTGOT 0x0000000000201000
# CHECK: PLTRELSZ 0x0000000000000048
# CHECK: PLTREL 0x0000000000000007
# CHECK: JMPREL 0x0000000000000658
# CHECK: RELA 0x0000000000000550
# CHECK: RELASZ 0x0000000000000108
# CHECK: RELAENT 0x0000000000000018
# CHECK: FLAGS_1 0x0000000008000000
# CHECK: VERNEED 0x0000000000000510
# CHECK: VERNEEDNUM 0x0000000000000002
# CHECK: VERSYM 0x00000000000004f8
# CHECK: RELACOUNT 0x0000000000000004
# CHECK: RELRSZ 0x0000000000000014
# CHECK: RELR 0x0000000087654321
# CHECK: RELRENT 0x0000000000000010

19
test/tools/llvm-objdump/private-headers-no-dynamic.test Normal file
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@ -0,0 +1,19 @@
# RUN: yaml2obj %s > %t
# RUN: llvm-objdump -p %t | FileCheck %s
!ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_REL
Machine: EM_X86_64
Sections:
- Name: .text
Type: SHT_PROGBITS
Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
Address: 0x1000
AddressAlign: 0x0000000000000010
Size: 64
# CHECK: Dynamic Section:
# CHECK-NOT: {{.}}

89
tools/llvm-objdump/ELFDump.cpp
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@ -21,6 +21,77 @@
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";
@ -103,3 +174,21 @@ void llvm::printELFFileHeader(const object::ObjectFile *Obj) {
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());
}

6
tools/llvm-objdump/llvm-objdump.cpp
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@ -2153,8 +2153,10 @@ static void printFaultMaps(const ObjectFile *Obj) {
}
static void printPrivateFileHeaders(const ObjectFile *o, bool onlyFirst) {
if (o->isELF())
return printELFFileHeader(o);
if (o->isELF()) {
printELFFileHeader(o);
return printELFDynamicSection(o);
}
if (o->isCOFF())
return printCOFFFileHeader(o);
if (o->isWasm())

1
tools/llvm-objdump/llvm-objdump.h
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@ -79,6 +79,7 @@ void printMachOBindTable(object::MachOObjectFile* o);
void printMachOLazyBindTable(object::MachOObjectFile* o);
void printMachOWeakBindTable(object::MachOObjectFile* o);
void printELFFileHeader(const object::ObjectFile *o);
void printELFDynamicSection(const object::ObjectFile *Obj);
void printCOFFFileHeader(const object::ObjectFile *o);
void printCOFFSymbolTable(const object::COFFImportFile *i);
void printCOFFSymbolTable(const object::COFFObjectFile *o);