--- /dev/null
+RUN: yaml2obj %p/Inputs/x86_64-exe.yaml > %t.in123.exe
+
+# Using a debuglink filename with a length that is a multiple of 4, to
+# showcase padding in CONTENTS below.
+
+RUN: llvm-objcopy --add-gnu-debuglink=%t.in123.exe %t.in123.exe %t.out.exe
+RUN: llvm-readobj -sections %t.out.exe | FileCheck %s --check-prefix=SECTIONS
+RUN: llvm-objdump -s %t.out.exe | FileCheck %s --check-prefix=CONTENTS
+
+# Show the last of the preexisting sections, which is used for choosing
+# a virtual address for the generated one.
+
+SECTIONS: Section {
+SECTIONS: Number: 4
+SECTIONS-NEXT: Name: .pdata
+SECTIONS-NEXT: VirtualSize: 0x18
+SECTIONS-NEXT: VirtualAddress: 0x4000
+SECTIONS-NEXT: RawDataSize: 512
+SECTIONS: Section {
+SECTIONS-NEXT: Number: 5
+SECTIONS-NEXT: Name: .gnu_debuglink
+SECTIONS-NEXT: VirtualSize: 0x2C
+SECTIONS-NEXT: VirtualAddress: 0x5000
+SECTIONS-NEXT: RawDataSize: 512
+SECTIONS-NEXT: PointerToRawData:
+SECTIONS-NEXT: PointerToRelocations:
+SECTIONS-NEXT: PointerToLineNumbers:
+SECTIONS-NEXT: RelocationCount:
+SECTIONS-NEXT: LineNumberCount:
+SECTIONS-NEXT: Characteristics [ (0x42000040)
+SECTIONS-NEXT: IMAGE_SCN_CNT_INITIALIZED_DATA (0x40)
+SECTIONS-NEXT: IMAGE_SCN_MEM_DISCARDABLE (0x2000000)
+SECTIONS-NEXT: IMAGE_SCN_MEM_READ (0x40000000)
+SECTIONS-NEXT: ]
+
+# Note: The last 4 bytes here are the crc of the referenced file - if the
+# yaml2obj generated file changes, this crc changes.
+
+CONTENTS: Contents of section .gnu_debuglink:
+CONTENTS: 40005000 6164642d 676e752d 64656275 676c696e add-gnu-debuglin
+CONTENTS: 40005010 6b2e7465 73742e74 6d702e69 6e313233 k.test.tmp.in123
+CONTENTS: 40005020 2e657865 00000000 7929adc3 .exe
#include "llvm/Object/Binary.h"
#include "llvm/Object/COFF.h"
#include "llvm/Support/Errc.h"
+#include "llvm/Support/JamCRC.h"
+#include "llvm/Support/Path.h"
#include <cassert>
namespace llvm {
return Sec.Name.startswith(".debug");
}
+static uint64_t getNextRVA(const Object &Obj) {
+ if (Obj.getSections().empty())
+ return 0;
+ const Section &Last = Obj.getSections().back();
+ return alignTo(Last.Header.VirtualAddress + Last.Header.VirtualSize,
+ Obj.PeHeader.SectionAlignment);
+}
+
+static uint32_t getCRC32(StringRef Data) {
+ JamCRC CRC;
+ CRC.update(ArrayRef<char>(Data.data(), Data.size()));
+ // The CRC32 value needs to be complemented because the JamCRC dosn't
+ // finalize the CRC32 value. It also dosn't negate the initial CRC32 value
+ // but it starts by default at 0xFFFFFFFF which is the complement of zero.
+ return ~CRC.getCRC();
+}
+
+static std::vector<uint8_t> createGnuDebugLinkSectionContents(StringRef File) {
+ ErrorOr<std::unique_ptr<MemoryBuffer>> LinkTargetOrErr =
+ MemoryBuffer::getFile(File);
+ if (!LinkTargetOrErr)
+ error("'" + File + "': " + LinkTargetOrErr.getError().message());
+ auto LinkTarget = std::move(*LinkTargetOrErr);
+ uint32_t CRC32 = getCRC32(LinkTarget->getBuffer());
+
+ StringRef FileName = sys::path::filename(File);
+ size_t CRCPos = alignTo(FileName.size() + 1, 4);
+ std::vector<uint8_t> Data(CRCPos + 4);
+ memcpy(Data.data(), FileName.data(), FileName.size());
+ support::endian::write32le(Data.data() + CRCPos, CRC32);
+ return Data;
+}
+
+static void addGnuDebugLink(Object &Obj, StringRef DebugLinkFile) {
+ uint32_t StartRVA = getNextRVA(Obj);
+
+ std::vector<Section> Sections;
+ Section Sec;
+ Sec.setOwnedContents(createGnuDebugLinkSectionContents(DebugLinkFile));
+ Sec.Name = ".gnu_debuglink";
+ Sec.Header.VirtualSize = Sec.getContents().size();
+ Sec.Header.VirtualAddress = StartRVA;
+ Sec.Header.SizeOfRawData =
+ alignTo(Sec.Header.VirtualSize, Obj.PeHeader.FileAlignment);
+ // Sec.Header.PointerToRawData is filled in by the writer.
+ Sec.Header.PointerToRelocations = 0;
+ Sec.Header.PointerToLinenumbers = 0;
+ // Sec.Header.NumberOfRelocations is filled in by the writer.
+ Sec.Header.NumberOfLinenumbers = 0;
+ Sec.Header.Characteristics = IMAGE_SCN_CNT_INITIALIZED_DATA |
+ IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_DISCARDABLE;
+ Sections.push_back(Sec);
+ Obj.addSections(Sections);
+}
+
static Error handleArgs(const CopyConfig &Config, Object &Obj) {
// Perform the actual section removals.
Obj.removeSections([&Config](const Section &Sec) {
return false;
});
+
+ if (!Config.AddGnuDebugLink.empty())
+ addGnuDebugLink(Obj, Config.AddGnuDebugLink);
+
return Error::success();
}
void Object::truncateSections(function_ref<bool(const Section &)> ToTruncate) {
for (Section &Sec : Sections) {
if (ToTruncate(Sec)) {
- Sec.Contents = ArrayRef<uint8_t>();
+ Sec.clearContents();
Sec.Relocs.clear();
Sec.Header.SizeOfRawData = 0;
}
struct Section {
object::coff_section Header;
- ArrayRef<uint8_t> Contents;
std::vector<Relocation> Relocs;
StringRef Name;
ssize_t UniqueId;
size_t Index;
+
+ ArrayRef<uint8_t> getContents() const {
+ if (!OwnedContents.empty())
+ return OwnedContents;
+ return ContentsRef;
+ }
+
+ void setContentsRef(ArrayRef<uint8_t> Data) {
+ OwnedContents.clear();
+ ContentsRef = Data;
+ }
+
+ void setOwnedContents(std::vector<uint8_t> &&Data) {
+ ContentsRef = ArrayRef<uint8_t>();
+ OwnedContents = std::move(Data);
+ }
+
+ void clearContents() {
+ ContentsRef = ArrayRef<uint8_t>();
+ OwnedContents.clear();
+ }
+
+private:
+ ArrayRef<uint8_t> ContentsRef;
+ std::vector<uint8_t> OwnedContents;
};
struct Symbol {
Sections.push_back(Section());
Section &S = Sections.back();
S.Header = *Sec;
- if (auto EC = COFFObj.getSectionContents(Sec, S.Contents))
+ ArrayRef<uint8_t> Contents;
+ if (auto EC = COFFObj.getSectionContents(Sec, Contents))
return errorCodeToError(EC);
+ S.setContentsRef(Contents);
ArrayRef<coff_relocation> Relocs = COFFObj.getRelocations(Sec);
for (const coff_relocation &R : Relocs)
S.Relocs.push_back(R);
void COFFWriter::writeSections() {
for (const auto &S : Obj.getSections()) {
uint8_t *Ptr = Buf.getBufferStart() + S.Header.PointerToRawData;
- std::copy(S.Contents.begin(), S.Contents.end(), Ptr);
+ ArrayRef<uint8_t> Contents = S.getContents();
+ std::copy(Contents.begin(), Contents.end(), Ptr);
// For executable sections, pad the remainder of the raw data size with
// 0xcc, which is int3 on x86.
if ((S.Header.Characteristics & IMAGE_SCN_CNT_CODE) &&
- S.Header.SizeOfRawData > S.Contents.size())
- memset(Ptr + S.Contents.size(), 0xcc,
- S.Header.SizeOfRawData - S.Contents.size());
+ S.Header.SizeOfRawData > Contents.size())
+ memset(Ptr + Contents.size(), 0xcc,
+ S.Header.SizeOfRawData - Contents.size());
Ptr += S.Header.SizeOfRawData;
for (const auto &R : S.Relocs) {
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