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[llvm-objcopy] Add support for --add-section for COFF
This patch enables support for --add-section=... option for COFF objects. Differential Revision: https://reviews.llvm.org/D65040 llvm-svn: 367130
This commit is contained in:
Sergey Dmitriev
parent
24428b8834
commit
01192d9596
@ -36,6 +36,13 @@ multiple file formats.
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Add a .gnu_debuglink section for ``<debug-file>`` to the output.
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.. option:: --add-section <section=file>
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Add a section named ``<section>`` with the contents of ``<file>`` to the
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output. For ELF objects the section will be of type `SHT_NOTE`, if the name
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starts with ".note". Otherwise, it will have type `SHT_PROGBITS`. Can be
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specified multiple times to add multiple sections.
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.. option:: --disable-deterministic-archives, -U
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Use real values for UIDs, GIDs and timestamps when updating archive member
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@ -141,13 +148,6 @@ The following options are implemented only for ELF objects. If used with other
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objects, :program:`llvm-objcopy` will either emit an error or silently ignore
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them.
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.. option:: --add-section <section=file>
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Add a section named ``<section>`` with the contents of ``<file>`` to the
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output. The section will be of type `SHT_NOTE`, if the name starts with
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".note". Otherwise, it will have type `SHT_PROGBITS`. Can be specified multiple
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times to add multiple sections.
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.. option:: --add-symbol <name>=[<section>:]<value>[,<flags>]
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Add a new symbol called ``<name>`` to the output symbol table, in the section
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56
test/tools/llvm-objcopy/COFF/add-section.test
Normal file
56
test/tools/llvm-objcopy/COFF/add-section.test
Normal file
@ -0,0 +1,56 @@
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# RUN: yaml2obj %s > %t
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## Test that llvm-objcopy adds a section to the given object with expected
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## contents.
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# RUN: echo DEADBEEF > %t.sec
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# RUN: llvm-objcopy --add-section=.test.section=%t.sec %t %t1
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# RUN: llvm-readobj --file-headers --sections --section-data %t1 | FileCheck %s --check-prefixes=CHECK-ADD
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# CHECK-ADD: SectionCount: 2
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# CHECK-ADD: Name: .text
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# CHECK-ADD: Name: .test.section
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# CHECK-ADD: Characteristics [
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# CHECK-ADD-NEXT: IMAGE_SCN_ALIGN_1BYTES
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# CHECK-ADD-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
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# CHECK-ADD-NEXT: ]
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# CHECK-ADD: SectionData (
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# CHECK-ADD-NEXT: 0000: {{.+}}|DEADBEEF{{.+}}|
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# CHECK-ADD-NEXT: )
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## Test that llvm-objcopy can add a section with an empty name.
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# RUN: llvm-objcopy --add-section==%t.sec %t %t1.empty.name
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# RUN: llvm-readobj --file-headers --sections --section-data %t1.empty.name | FileCheck %s --check-prefixes=CHECK-ADD-EMPTY-NAME
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# CHECK-ADD-EMPTY-NAME: SectionCount: 2
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# CHECK-ADD-EMPTY-NAME: Name: .text
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# CHECK-ADD-EMPTY-NAME: Name: (00 00 00 00 00 00 00 00)
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# CHECK-ADD-EMPTY-NAME: Characteristics [
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# CHECK-ADD-EMPTY-NAME-NEXT: IMAGE_SCN_ALIGN_1BYTES
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# CHECK-ADD-EMPTY-NAME-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA
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# CHECK-ADD-EMPTY-NAME-NEXT: ]
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# CHECK-ADD-EMPTY-NAME: SectionData (
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# CHECK-ADD-EMPTY-NAME-NEXT: 0000: {{.+}}|DEADBEEF{{.+}}|
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# CHECK-ADD-EMPTY-NAME-NEXT: )
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## Test that llvm-objcopy produces an error if the file with section contents
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## to be added does not exist.
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# RUN: not llvm-objcopy --add-section=.another.section=%t2 %t %t3 2>&1 | FileCheck -DFILE=%t -DFILE1=%t2 %s --check-prefixes=CHECK-ERR1
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# CHECK-ERR1: llvm-objcopy{{(.exe)?}}: error: '[[FILE]]': '[[FILE1]]': {{[Nn]}}o such file or directory
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## Another negative test for invalid --add-sections command line argument.
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# RUN: not llvm-objcopy --add-section=.another.section %t %t3 2>&1 | FileCheck -DFILE=%t %s --check-prefixes=CHECK-ERR2
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# CHECK-ERR2: llvm-objcopy{{(.exe)?}}: error: '[[FILE]]': bad format for --add-section
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--- !COFF
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header:
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Machine: IMAGE_FILE_MACHINE_AMD64
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Characteristics: [ ]
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sections:
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- Name: .text
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Characteristics: [ ]
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Alignment: 4
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SectionData: 488B0500000000C3
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symbols:
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...
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@ -65,26 +65,37 @@ static std::vector<uint8_t> createGnuDebugLinkSectionContents(StringRef File) {
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return Data;
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}
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static void addGnuDebugLink(Object &Obj, StringRef DebugLinkFile) {
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uint32_t StartRVA = getNextRVA(Obj);
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// Adds named section with given contents to the object.
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static void addSection(Object &Obj, StringRef Name, ArrayRef<uint8_t> Contents,
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uint32_t Characteristics) {
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bool NeedVA = Characteristics & (IMAGE_SCN_MEM_EXECUTE | IMAGE_SCN_MEM_READ |
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IMAGE_SCN_MEM_WRITE);
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std::vector<Section> Sections;
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Section Sec;
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Sec.setOwnedContents(createGnuDebugLinkSectionContents(DebugLinkFile));
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Sec.Name = ".gnu_debuglink";
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Sec.Header.VirtualSize = Sec.getContents().size();
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Sec.Header.VirtualAddress = StartRVA;
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Sec.Header.SizeOfRawData = alignTo(Sec.Header.VirtualSize,
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Obj.IsPE ? Obj.PeHeader.FileAlignment : 1);
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Sec.setOwnedContents(Contents);
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Sec.Name = Name;
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Sec.Header.VirtualSize = NeedVA ? Sec.getContents().size() : 0u;
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Sec.Header.VirtualAddress = NeedVA ? getNextRVA(Obj) : 0u;
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Sec.Header.SizeOfRawData =
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NeedVA ? alignTo(Sec.Header.VirtualSize,
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Obj.IsPE ? Obj.PeHeader.FileAlignment : 1)
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: Sec.getContents().size();
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// Sec.Header.PointerToRawData is filled in by the writer.
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Sec.Header.PointerToRelocations = 0;
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Sec.Header.PointerToLinenumbers = 0;
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// Sec.Header.NumberOfRelocations is filled in by the writer.
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Sec.Header.NumberOfLinenumbers = 0;
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Sec.Header.Characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA |
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IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_DISCARDABLE;
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Sections.push_back(Sec);
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Obj.addSections(Sections);
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Sec.Header.Characteristics = Characteristics;
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Obj.addSections(Sec);
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}
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static void addGnuDebugLink(Object &Obj, StringRef DebugLinkFile) {
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std::vector<uint8_t> Contents =
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createGnuDebugLinkSectionContents(DebugLinkFile);
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addSection(Obj, ".gnu_debuglink", Contents,
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IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ |
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IMAGE_SCN_MEM_DISCARDABLE);
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}
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static Error handleArgs(const CopyConfig &Config, Object &Obj) {
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@ -171,21 +182,40 @@ static Error handleArgs(const CopyConfig &Config, Object &Obj) {
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return false;
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});
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for (const auto &Flag : Config.AddSection) {
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StringRef SecName, FileName;
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std::tie(SecName, FileName) = Flag.split("=");
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if (FileName.empty())
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return createStringError(llvm::errc::invalid_argument,
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"bad format for --add-section");
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auto BufOrErr = MemoryBuffer::getFile(FileName);
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if (!BufOrErr)
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return createFileError(FileName, errorCodeToError(BufOrErr.getError()));
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auto Buf = std::move(*BufOrErr);
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addSection(
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Obj, SecName,
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makeArrayRef(reinterpret_cast<const uint8_t *>(Buf->getBufferStart()),
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Buf->getBufferSize()),
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IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_ALIGN_1BYTES);
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}
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if (!Config.AddGnuDebugLink.empty())
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addGnuDebugLink(Obj, Config.AddGnuDebugLink);
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if (Config.AllowBrokenLinks || !Config.BuildIdLinkDir.empty() ||
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Config.BuildIdLinkInput || Config.BuildIdLinkOutput ||
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!Config.SplitDWO.empty() || !Config.SymbolsPrefix.empty() ||
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!Config.AllocSectionsPrefix.empty() || !Config.AddSection.empty() ||
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!Config.DumpSection.empty() || !Config.KeepSection.empty() ||
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!Config.SymbolsToGlobalize.empty() || !Config.SymbolsToKeep.empty() ||
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!Config.SymbolsToLocalize.empty() || !Config.SymbolsToWeaken.empty() ||
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!Config.SymbolsToKeepGlobal.empty() || !Config.SectionsToRename.empty() ||
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!Config.SetSectionFlags.empty() || !Config.SymbolsToRename.empty() ||
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Config.ExtractDWO || Config.KeepFileSymbols || Config.LocalizeHidden ||
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Config.PreserveDates || Config.StripDWO || Config.StripNonAlloc ||
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Config.StripSections || Config.Weaken || Config.DecompressDebugSections ||
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!Config.AllocSectionsPrefix.empty() || !Config.DumpSection.empty() ||
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!Config.KeepSection.empty() || !Config.SymbolsToGlobalize.empty() ||
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!Config.SymbolsToKeep.empty() || !Config.SymbolsToLocalize.empty() ||
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!Config.SymbolsToWeaken.empty() || !Config.SymbolsToKeepGlobal.empty() ||
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!Config.SectionsToRename.empty() || !Config.SetSectionFlags.empty() ||
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!Config.SymbolsToRename.empty() || Config.ExtractDWO ||
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Config.KeepFileSymbols || Config.LocalizeHidden || Config.PreserveDates ||
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Config.StripDWO || Config.StripNonAlloc || Config.StripSections ||
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Config.Weaken || Config.DecompressDebugSections ||
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Config.DiscardMode == DiscardType::Locals ||
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!Config.SymbolsToAdd.empty() || Config.EntryExpr) {
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return createStringError(llvm::errc::invalid_argument,
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@ -120,12 +120,12 @@ size_t COFFWriter::finalizeStringTable() {
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StrTabBuilder.finalize();
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for (auto &S : Obj.getMutableSections()) {
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memset(S.Header.Name, 0, sizeof(S.Header.Name));
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if (S.Name.size() > COFF::NameSize) {
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memset(S.Header.Name, 0, sizeof(S.Header.Name));
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snprintf(S.Header.Name, sizeof(S.Header.Name), "/%d",
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(int)StrTabBuilder.getOffset(S.Name));
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} else {
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strncpy(S.Header.Name, S.Name.data(), COFF::NameSize);
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memcpy(S.Header.Name, S.Name.data(), S.Name.size());
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}
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}
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for (auto &S : Obj.getMutableSymbols()) {
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