[llvm-objcopy] Add support for -I binary -B <arch>.
Summary:
The -I (--input-target) and -B (--binary-architecture) flags exist but are currently silently ignored. This adds support for -I binary for architectures i386, x86-64 (and alias i386:x86-64), arm, aarch64, sparc, and ppc (powerpc:common64). This is largely based on D41687.
This is done by implementing an additional subclass of Reader, BinaryReader, which works by interpreting the input file as contents for .data field, sets up a synthetic header, and adds additional sections/symbols (e.g. _binary__tmp_data_txt_start).
Reviewers: jakehehrlich, alexshap, jhenderson, javed.absar
Reviewed By: jhenderson
Subscribers: jyknight, nemanjai, kbarton, fedor.sergeev, jrtc27, kristof.beyls, paulsemel, llvm-commits
Differential Revision: https://reviews.llvm.org/D50343
llvm-svn: 340070
diff --git a/llvm/tools/llvm-objcopy/Object.cpp b/llvm/tools/llvm-objcopy/Object.cpp
index 1fb0de8..12fd802 100644
--- a/llvm/tools/llvm-objcopy/Object.cpp
+++ b/llvm/tools/llvm-objcopy/Object.cpp
@@ -230,12 +230,12 @@
Sym->Index = Index++;
}
-void SymbolTableSection::addSymbol(StringRef Name, uint8_t Bind, uint8_t Type,
+void SymbolTableSection::addSymbol(Twine Name, uint8_t Bind, uint8_t Type,
SectionBase *DefinedIn, uint64_t Value,
uint8_t Visibility, uint16_t Shndx,
- uint64_t Sz) {
+ uint64_t Size) {
Symbol Sym;
- Sym.Name = Name;
+ Sym.Name = Name.str();
Sym.Binding = Bind;
Sym.Type = Type;
Sym.DefinedIn = DefinedIn;
@@ -249,7 +249,7 @@
}
Sym.Value = Value;
Sym.Visibility = Visibility;
- Sym.Size = Sz;
+ Sym.Size = Size;
Sym.Index = Symbols.size();
Symbols.emplace_back(llvm::make_unique<Symbol>(Sym));
Size += this->EntrySize;
@@ -587,6 +587,84 @@
return A->Index < B->Index;
}
+template <class ELFT> void BinaryELFBuilder<ELFT>::initFileHeader() {
+ Obj->Flags = 0x0;
+ Obj->Type = ET_REL;
+ Obj->Entry = 0x0;
+ Obj->Machine = EMachine;
+ Obj->Version = 1;
+}
+
+template <class ELFT> void BinaryELFBuilder<ELFT>::initHeaderSegment() {
+ Obj->ElfHdrSegment.Index = 0;
+}
+
+template <class ELFT> StringTableSection *BinaryELFBuilder<ELFT>::addStrTab() {
+ auto &StrTab = Obj->addSection<StringTableSection>();
+ StrTab.Name = ".strtab";
+
+ Obj->SectionNames = &StrTab;
+ return &StrTab;
+}
+
+template <class ELFT>
+SymbolTableSection *
+BinaryELFBuilder<ELFT>::addSymTab(StringTableSection *StrTab) {
+ auto &SymTab = Obj->addSection<SymbolTableSection>();
+
+ SymTab.Name = ".symtab";
+ SymTab.Link = StrTab->Index;
+ // TODO: Factor out dependence on ElfType here.
+ SymTab.EntrySize = sizeof(Elf_Sym);
+
+ // The symbol table always needs a null symbol
+ SymTab.addSymbol("", 0, 0, nullptr, 0, 0, 0, 0);
+
+ Obj->SymbolTable = &SymTab;
+ return &SymTab;
+}
+
+template <class ELFT>
+void BinaryELFBuilder<ELFT>::addData(SymbolTableSection *SymTab) {
+ auto Data = ArrayRef<uint8_t>(
+ reinterpret_cast<const uint8_t *>(MemBuf->getBufferStart()),
+ MemBuf->getBufferSize());
+ auto &DataSection = Obj->addSection<Section>(Data);
+ DataSection.Name = ".data";
+ DataSection.Type = ELF::SHT_PROGBITS;
+ DataSection.Size = Data.size();
+ DataSection.Flags = ELF::SHF_ALLOC | ELF::SHF_WRITE;
+
+ std::string SanitizedFilename = MemBuf->getBufferIdentifier().str();
+ std::replace_if(std::begin(SanitizedFilename), std::end(SanitizedFilename),
+ [](char c) { return !isalnum(c); }, '_');
+ Twine Prefix = Twine("_binary_") + SanitizedFilename;
+
+ SymTab->addSymbol(Prefix + "_start", STB_GLOBAL, STT_NOTYPE, &DataSection,
+ /*Value=*/0, STV_DEFAULT, 0, 0);
+ SymTab->addSymbol(Prefix + "_end", STB_GLOBAL, STT_NOTYPE, &DataSection,
+ /*Value=*/DataSection.Size, STV_DEFAULT, 0, 0);
+ SymTab->addSymbol(Prefix + "_size", STB_GLOBAL, STT_NOTYPE, nullptr,
+ /*Value=*/DataSection.Size, STV_DEFAULT, SHN_ABS, 0);
+}
+
+template <class ELFT> void BinaryELFBuilder<ELFT>::initSections() {
+ for (auto &Section : Obj->sections()) {
+ Section.initialize(Obj->sections());
+ }
+}
+
+template <class ELFT> std::unique_ptr<Object> BinaryELFBuilder<ELFT>::build() {
+ initFileHeader();
+ initHeaderSegment();
+ StringTableSection *StrTab = addStrTab();
+ SymbolTableSection *SymTab = addSymTab(StrTab);
+ initSections();
+ addData(SymTab);
+
+ return std::move(Obj);
+}
+
template <class ELFT> void ELFBuilder<ELFT>::setParentSegment(Segment &Child) {
for (auto &Parent : Obj.segments()) {
// Every segment will overlap with itself but we don't want a segment to
@@ -631,15 +709,6 @@
}
auto &ElfHdr = Obj.ElfHdrSegment;
- // Creating multiple PT_PHDR segments technically is not valid, but PT_LOAD
- // segments must not overlap, and other types fit even less.
- ElfHdr.Type = PT_PHDR;
- ElfHdr.Flags = 0;
- ElfHdr.OriginalOffset = ElfHdr.Offset = 0;
- ElfHdr.VAddr = 0;
- ElfHdr.PAddr = 0;
- ElfHdr.FileSize = ElfHdr.MemSize = sizeof(Elf_Ehdr);
- ElfHdr.Align = 0;
ElfHdr.Index = Index++;
const auto &Ehdr = *ElfFile.getHeader();
@@ -894,7 +963,6 @@
template <class ELFT> void ELFBuilder<ELFT>::build() {
const auto &Ehdr = *ElfFile.getHeader();
- std::copy(Ehdr.e_ident, Ehdr.e_ident + 16, Obj.Ident);
Obj.Type = Ehdr.e_type;
Obj.Machine = Ehdr.e_machine;
Obj.Version = Ehdr.e_version;
@@ -926,16 +994,15 @@
Reader::~Reader() {}
-ElfType ELFReader::getElfType() const {
- if (isa<ELFObjectFile<ELF32LE>>(Bin))
- return ELFT_ELF32LE;
- if (isa<ELFObjectFile<ELF64LE>>(Bin))
- return ELFT_ELF64LE;
- if (isa<ELFObjectFile<ELF32BE>>(Bin))
- return ELFT_ELF32BE;
- if (isa<ELFObjectFile<ELF64BE>>(Bin))
- return ELFT_ELF64BE;
- llvm_unreachable("Invalid ELFType");
+std::unique_ptr<Object> BinaryReader::create() const {
+ if (MInfo.Is64Bit)
+ return MInfo.IsLittleEndian
+ ? BinaryELFBuilder<ELF64LE>(MInfo.EMachine, MemBuf).build()
+ : BinaryELFBuilder<ELF64BE>(MInfo.EMachine, MemBuf).build();
+ else
+ return MInfo.IsLittleEndian
+ ? BinaryELFBuilder<ELF32LE>(MInfo.EMachine, MemBuf).build()
+ : BinaryELFBuilder<ELF32BE>(MInfo.EMachine, MemBuf).build();
}
std::unique_ptr<Object> ELFReader::create() const {
@@ -963,11 +1030,24 @@
template <class ELFT> void ELFWriter<ELFT>::writeEhdr() {
uint8_t *B = Buf.getBufferStart();
Elf_Ehdr &Ehdr = *reinterpret_cast<Elf_Ehdr *>(B);
- std::copy(Obj.Ident, Obj.Ident + 16, Ehdr.e_ident);
+ std::fill(Ehdr.e_ident, Ehdr.e_ident + 16, 0);
+ Ehdr.e_ident[EI_MAG0] = 0x7f;
+ Ehdr.e_ident[EI_MAG1] = 'E';
+ Ehdr.e_ident[EI_MAG2] = 'L';
+ Ehdr.e_ident[EI_MAG3] = 'F';
+ Ehdr.e_ident[EI_CLASS] = ELFT::Is64Bits ? ELFCLASS64 : ELFCLASS32;
+ Ehdr.e_ident[EI_DATA] =
+ ELFT::TargetEndianness == support::big ? ELFDATA2MSB : ELFDATA2LSB;
+ Ehdr.e_ident[EI_VERSION] = EV_CURRENT;
+ Ehdr.e_ident[EI_OSABI] = ELFOSABI_NONE;
+ Ehdr.e_ident[EI_ABIVERSION] = 0;
+
Ehdr.e_type = Obj.Type;
Ehdr.e_machine = Obj.Machine;
Ehdr.e_version = Obj.Version;
Ehdr.e_entry = Obj.Entry;
+ // TODO: Only set phoff when a program header exists, to avoid tools
+ // thinking this is corrupt data.
Ehdr.e_phoff = Obj.ProgramHdrSegment.Offset;
Ehdr.e_flags = Obj.Flags;
Ehdr.e_ehsize = sizeof(Elf_Ehdr);
@@ -1172,6 +1252,17 @@
return Offset;
}
+template <class ELFT> void ELFWriter<ELFT>::initEhdrSegment() {
+ auto &ElfHdr = Obj.ElfHdrSegment;
+ ElfHdr.Type = PT_PHDR;
+ ElfHdr.Flags = 0;
+ ElfHdr.OriginalOffset = ElfHdr.Offset = 0;
+ ElfHdr.VAddr = 0;
+ ElfHdr.PAddr = 0;
+ ElfHdr.FileSize = ElfHdr.MemSize = sizeof(Elf_Ehdr);
+ ElfHdr.Align = 0;
+}
+
template <class ELFT> void ELFWriter<ELFT>::assignOffsets() {
// We need a temporary list of segments that has a special order to it
// so that we know that anytime ->ParentSegment is set that segment has
@@ -1263,6 +1354,7 @@
Obj.SectionNames->addString(Section.Name);
}
+ initEhdrSegment();
// Before we can prepare for layout the indexes need to be finalized.
uint64_t Index = 0;
for (auto &Sec : Obj.sections())
@@ -1390,6 +1482,11 @@
namespace llvm {
namespace objcopy {
+template class BinaryELFBuilder<ELF64LE>;
+template class BinaryELFBuilder<ELF64BE>;
+template class BinaryELFBuilder<ELF32LE>;
+template class BinaryELFBuilder<ELF32BE>;
+
template class ELFBuilder<ELF64LE>;
template class ELFBuilder<ELF64BE>;
template class ELFBuilder<ELF32LE>;
diff --git a/llvm/tools/llvm-objcopy/Object.h b/llvm/tools/llvm-objcopy/Object.h
index cabab03..e9a4c35 100644
--- a/llvm/tools/llvm-objcopy/Object.h
+++ b/llvm/tools/llvm-objcopy/Object.h
@@ -64,6 +64,15 @@
enum ElfType { ELFT_ELF32LE, ELFT_ELF64LE, ELFT_ELF32BE, ELFT_ELF64BE };
+// This type keeps track of the machine info for various architectures. This
+// lets us map architecture names to ELF types and the e_machine value of the
+// ELF file.
+struct MachineInfo {
+ uint16_t EMachine;
+ bool Is64Bit;
+ bool IsLittleEndian;
+};
+
class SectionVisitor {
public:
virtual ~SectionVisitor();
@@ -196,6 +205,8 @@
using Elf_Phdr = typename ELFT::Phdr;
using Elf_Ehdr = typename ELFT::Ehdr;
+ void initEhdrSegment();
+
void writeEhdr();
void writePhdr(const Segment &Seg);
void writeShdr(const SectionBase &Sec);
@@ -440,9 +451,11 @@
using SymPtr = std::unique_ptr<Symbol>;
public:
- void addSymbol(StringRef Name, uint8_t Bind, uint8_t Type,
- SectionBase *DefinedIn, uint64_t Value, uint8_t Visibility,
- uint16_t Shndx, uint64_t Sz);
+ SymbolTableSection() { Type = ELF::SHT_SYMTAB; }
+
+ void addSymbol(Twine Name, uint8_t Bind, uint8_t Type, SectionBase *DefinedIn,
+ uint64_t Value, uint8_t Visibility, uint16_t Shndx,
+ uint64_t Size);
void prepareForLayout();
// An 'empty' symbol table still contains a null symbol.
bool empty() const { return Symbols.size() == 1; }
@@ -626,11 +639,31 @@
using object::ELFObjectFile;
using object::OwningBinary;
+template <class ELFT> class BinaryELFBuilder {
+ using Elf_Sym = typename ELFT::Sym;
+
+ uint16_t EMachine;
+ MemoryBuffer *MemBuf;
+ std::unique_ptr<Object> Obj;
+
+ void initFileHeader();
+ void initHeaderSegment();
+ StringTableSection *addStrTab();
+ SymbolTableSection *addSymTab(StringTableSection *StrTab);
+ void addData(SymbolTableSection *SymTab);
+ void initSections();
+
+public:
+ BinaryELFBuilder(uint16_t EM, MemoryBuffer *MB)
+ : EMachine(EM), MemBuf(MB), Obj(llvm::make_unique<Object>()) {}
+
+ std::unique_ptr<Object> build();
+};
+
template <class ELFT> class ELFBuilder {
private:
using Elf_Addr = typename ELFT::Addr;
using Elf_Shdr = typename ELFT::Shdr;
- using Elf_Ehdr = typename ELFT::Ehdr;
using Elf_Word = typename ELFT::Word;
const ELFFile<ELFT> &ElfFile;
@@ -650,11 +683,20 @@
void build();
};
+class BinaryReader : public Reader {
+ const MachineInfo &MInfo;
+ MemoryBuffer *MemBuf;
+
+public:
+ BinaryReader(const MachineInfo &MI, MemoryBuffer *MB)
+ : MInfo(MI), MemBuf(MB) {}
+ std::unique_ptr<Object> create() const override;
+};
+
class ELFReader : public Reader {
Binary *Bin;
public:
- ElfType getElfType() const;
std::unique_ptr<Object> create() const override;
explicit ELFReader(Binary *B) : Bin(B) {}
};
@@ -685,7 +727,6 @@
Segment ElfHdrSegment;
Segment ProgramHdrSegment;
- uint8_t Ident[16];
uint64_t Entry;
uint64_t SHOffset;
uint32_t Type;
@@ -711,6 +752,7 @@
auto Sec = llvm::make_unique<T>(std::forward<Ts>(Args)...);
auto Ptr = Sec.get();
Sections.emplace_back(std::move(Sec));
+ Ptr->Index = Sections.size();
return *Ptr;
}
Segment &addSegment(ArrayRef<uint8_t> Data) {
diff --git a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
index ca6609f..7713aa6 100644
--- a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
+++ b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
@@ -34,6 +34,7 @@
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/FileOutputBuffer.h"
#include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/Memory.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/WithColor.h"
@@ -128,41 +129,51 @@
};
struct CopyConfig {
- StringRef OutputFilename;
+ // Main input/output options
StringRef InputFilename;
- StringRef OutputFormat;
StringRef InputFormat;
- StringRef BinaryArch;
+ StringRef OutputFilename;
+ StringRef OutputFormat;
- StringRef SplitDWO;
+ // Only applicable for --input-format=Binary
+ MachineInfo BinaryArch;
+
+ // Advanced options
StringRef AddGnuDebugLink;
+ StringRef SplitDWO;
StringRef SymbolsPrefix;
- std::vector<StringRef> ToRemove;
- std::vector<StringRef> Keep;
- std::vector<StringRef> OnlyKeep;
+
+ // Repeated options
std::vector<StringRef> AddSection;
std::vector<StringRef> DumpSection;
- std::vector<StringRef> SymbolsToLocalize;
+ std::vector<StringRef> Keep;
+ std::vector<StringRef> OnlyKeep;
std::vector<StringRef> SymbolsToGlobalize;
- std::vector<StringRef> SymbolsToWeaken;
- std::vector<StringRef> SymbolsToRemove;
std::vector<StringRef> SymbolsToKeep;
+ std::vector<StringRef> SymbolsToLocalize;
+ std::vector<StringRef> SymbolsToRemove;
+ std::vector<StringRef> SymbolsToWeaken;
+ std::vector<StringRef> ToRemove;
+
+ // Map options
StringMap<SectionRename> SectionsToRename;
StringMap<StringRef> SymbolsToRename;
+
+ // Boolean options
+ bool DiscardAll = false;
+ bool ExtractDWO = false;
+ bool KeepFileSymbols = false;
+ bool LocalizeHidden = false;
+ bool OnlyKeepDebug = false;
+ bool PreserveDates = false;
bool StripAll = false;
bool StripAllGNU = false;
- bool StripDebug = false;
- bool StripSections = false;
- bool StripNonAlloc = false;
bool StripDWO = false;
+ bool StripDebug = false;
+ bool StripNonAlloc = false;
+ bool StripSections = false;
bool StripUnneeded = false;
- bool ExtractDWO = false;
- bool LocalizeHidden = false;
bool Weaken = false;
- bool DiscardAll = false;
- bool OnlyKeepDebug = false;
- bool KeepFileSymbols = false;
- bool PreserveDates = false;
};
using SectionPred = std::function<bool(const SectionBase &Sec)>;
@@ -295,6 +306,45 @@
return !isDWOSection(Sec);
}
+static const StringMap<MachineInfo> ArchMap{
+ // Name, {EMachine, 64bit, LittleEndian}
+ {"aarch64", {EM_AARCH64, true, true}},
+ {"arm", {EM_ARM, false, true}},
+ {"i386", {EM_386, false, true}},
+ {"i386:x86-64", {EM_X86_64, true, true}},
+ {"powerpc:common64", {EM_PPC64, true, true}},
+ {"sparc", {EM_SPARC, false, true}},
+ {"x86-64", {EM_X86_64, true, true}},
+};
+
+static const MachineInfo &getMachineInfo(StringRef Arch) {
+ auto Iter = ArchMap.find(Arch);
+ if (Iter == std::end(ArchMap))
+ error("Invalid architecture: '" + Arch + "'");
+ return Iter->getValue();
+}
+
+static ElfType getOutputElfType(const Binary &Bin) {
+ // Infer output ELF type from the input ELF object
+ if (isa<ELFObjectFile<ELF32LE>>(Bin))
+ return ELFT_ELF32LE;
+ if (isa<ELFObjectFile<ELF64LE>>(Bin))
+ return ELFT_ELF64LE;
+ if (isa<ELFObjectFile<ELF32BE>>(Bin))
+ return ELFT_ELF32BE;
+ if (isa<ELFObjectFile<ELF64BE>>(Bin))
+ return ELFT_ELF64BE;
+ llvm_unreachable("Invalid ELFType");
+}
+
+static ElfType getOutputElfType(const MachineInfo &MI) {
+ // Infer output ELF type from the binary arch specified
+ if (MI.Is64Bit)
+ return MI.IsLittleEndian ? ELFT_ELF64LE : ELFT_ELF64BE;
+ else
+ return MI.IsLittleEndian ? ELFT_ELF32LE : ELFT_ELF32BE;
+}
+
static std::unique_ptr<Writer> createWriter(const CopyConfig &Config,
Object &Obj, Buffer &Buf,
ElfType OutputElfType) {
@@ -603,15 +653,14 @@
Obj.addSection<GnuDebugLinkSection>(Config.AddGnuDebugLink);
}
-static void executeElfObjcopyOnBinary(const CopyConfig &Config, Binary &Binary,
- Buffer &Out) {
- ELFReader Reader(&Binary);
+static void executeElfObjcopyOnBinary(const CopyConfig &Config, Reader &Reader,
+ Buffer &Out, ElfType OutputElfType) {
std::unique_ptr<Object> Obj = Reader.create();
- handleArgs(Config, *Obj, Reader, Reader.getElfType());
+ handleArgs(Config, *Obj, Reader, OutputElfType);
std::unique_ptr<Writer> Writer =
- createWriter(Config, *Obj, Out, Reader.getElfType());
+ createWriter(Config, *Obj, Out, OutputElfType);
Writer->finalize();
Writer->write();
}
@@ -653,12 +702,15 @@
Expected<std::unique_ptr<Binary>> ChildOrErr = Child.getAsBinary();
if (!ChildOrErr)
reportError(Ar.getFileName(), ChildOrErr.takeError());
+ Binary *Bin = ChildOrErr->get();
+
Expected<StringRef> ChildNameOrErr = Child.getName();
if (!ChildNameOrErr)
reportError(Ar.getFileName(), ChildNameOrErr.takeError());
MemBuffer MB(ChildNameOrErr.get());
- executeElfObjcopyOnBinary(Config, **ChildOrErr, MB);
+ ELFReader Reader(Bin);
+ executeElfObjcopyOnBinary(Config, Reader, MB, getOutputElfType(*Bin));
Expected<NewArchiveMember> Member =
NewArchiveMember::getOldMember(Child, true);
@@ -698,16 +750,29 @@
if (auto EC = sys::fs::status(Config.InputFilename, Stat))
reportError(Config.InputFilename, EC);
- Expected<OwningBinary<llvm::object::Binary>> BinaryOrErr =
- createBinary(Config.InputFilename);
- if (!BinaryOrErr)
- reportError(Config.InputFilename, BinaryOrErr.takeError());
+ if (Config.InputFormat == "binary") {
+ auto BufOrErr = MemoryBuffer::getFile(Config.InputFilename);
+ if (!BufOrErr)
+ reportError(Config.InputFilename, BufOrErr.getError());
- if (Archive *Ar = dyn_cast<Archive>(BinaryOrErr.get().getBinary())) {
- executeElfObjcopyOnArchive(Config, *Ar);
- } else {
FileBuffer FB(Config.OutputFilename);
- executeElfObjcopyOnBinary(Config, *BinaryOrErr.get().getBinary(), FB);
+ BinaryReader Reader(Config.BinaryArch, BufOrErr->get());
+ executeElfObjcopyOnBinary(Config, Reader, FB,
+ getOutputElfType(Config.BinaryArch));
+ } else {
+ Expected<OwningBinary<llvm::object::Binary>> BinaryOrErr =
+ createBinary(Config.InputFilename);
+ if (!BinaryOrErr)
+ reportError(Config.InputFilename, BinaryOrErr.takeError());
+
+ if (Archive *Ar = dyn_cast<Archive>(BinaryOrErr.get().getBinary())) {
+ executeElfObjcopyOnArchive(Config, *Ar);
+ } else {
+ FileBuffer FB(Config.OutputFilename);
+ Binary *Bin = BinaryOrErr.get().getBinary();
+ ELFReader Reader(Bin);
+ executeElfObjcopyOnBinary(Config, Reader, FB, getOutputElfType(*Bin));
+ }
}
if (Config.PreserveDates) {
@@ -755,7 +820,12 @@
Config.OutputFilename = Positional[Positional.size() == 1 ? 0 : 1];
Config.InputFormat = InputArgs.getLastArgValue(OBJCOPY_input_target);
Config.OutputFormat = InputArgs.getLastArgValue(OBJCOPY_output_target);
- Config.BinaryArch = InputArgs.getLastArgValue(OBJCOPY_binary_architecture);
+ if (Config.InputFormat == "binary") {
+ auto BinaryArch = InputArgs.getLastArgValue(OBJCOPY_binary_architecture);
+ if (BinaryArch.empty())
+ error("Specified binary input without specifiying an architecture");
+ Config.BinaryArch = getMachineInfo(BinaryArch);
+ }
Config.SplitDWO = InputArgs.getLastArgValue(OBJCOPY_split_dwo);
Config.AddGnuDebugLink = InputArgs.getLastArgValue(OBJCOPY_add_gnu_debuglink);