| //===- yaml2xcoff - Convert YAML to a xcoff object file -------------------===// |
| // |
| // 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 |
| /// The xcoff component of yaml2obj. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/ADT/DenseMap.h" |
| #include "llvm/BinaryFormat/XCOFF.h" |
| #include "llvm/MC/StringTableBuilder.h" |
| #include "llvm/Object/XCOFFObjectFile.h" |
| #include "llvm/ObjectYAML/ObjectYAML.h" |
| #include "llvm/ObjectYAML/yaml2obj.h" |
| #include "llvm/Support/EndianStream.h" |
| #include "llvm/Support/MemoryBuffer.h" |
| #include "llvm/Support/raw_ostream.h" |
| |
| using namespace llvm; |
| using namespace llvm::object; |
| |
| namespace { |
| |
| constexpr unsigned DefaultSectionAlign = 4; |
| constexpr int16_t MaxSectionIndex = INT16_MAX; |
| constexpr uint32_t MaxRawDataSize = UINT32_MAX; |
| |
| class XCOFFWriter { |
| public: |
| XCOFFWriter(XCOFFYAML::Object &Obj, raw_ostream &OS, yaml::ErrorHandler EH) |
| : Obj(Obj), W(OS, llvm::endianness::big), ErrHandler(EH), |
| StrTblBuilder(StringTableBuilder::XCOFF) { |
| Is64Bit = Obj.Header.Magic == (llvm::yaml::Hex16)XCOFF::XCOFF64; |
| } |
| bool writeXCOFF(); |
| |
| private: |
| void reportOverwrite(uint64_t currentOffset, uint64_t specifiedOffset, |
| const Twine &fieldName); |
| bool nameShouldBeInStringTable(StringRef SymbolName); |
| bool initFileHeader(uint64_t CurrentOffset); |
| void initAuxFileHeader(); |
| bool initSectionHeaders(uint64_t &CurrentOffset); |
| bool initRelocations(uint64_t &CurrentOffset); |
| bool initStringTable(); |
| bool assignAddressesAndIndices(); |
| |
| void writeFileHeader(); |
| void writeAuxFileHeader(); |
| void writeSectionHeaders(); |
| bool writeSectionData(); |
| bool writeRelocations(); |
| bool writeSymbols(); |
| void writeStringTable(); |
| |
| bool writeAuxSymbol(const XCOFFYAML::CsectAuxEnt &AuxSym); |
| bool writeAuxSymbol(const XCOFFYAML::FileAuxEnt &AuxSym); |
| bool writeAuxSymbol(const XCOFFYAML::FunctionAuxEnt &AuxSym); |
| bool writeAuxSymbol(const XCOFFYAML::ExcpetionAuxEnt &AuxSym); |
| bool writeAuxSymbol(const XCOFFYAML::BlockAuxEnt &AuxSym); |
| bool writeAuxSymbol(const XCOFFYAML::SectAuxEntForDWARF &AuxSym); |
| bool writeAuxSymbol(const XCOFFYAML::SectAuxEntForStat &AuxSym); |
| bool writeAuxSymbol(const std::unique_ptr<XCOFFYAML::AuxSymbolEnt> &AuxSym); |
| |
| XCOFFYAML::Object &Obj; |
| bool Is64Bit = false; |
| support::endian::Writer W; |
| yaml::ErrorHandler ErrHandler; |
| StringTableBuilder StrTblBuilder; |
| uint64_t StartOffset = 0u; |
| // Map the section name to its corrresponding section index. |
| DenseMap<StringRef, int16_t> SectionIndexMap = { |
| {StringRef("N_DEBUG"), XCOFF::N_DEBUG}, |
| {StringRef("N_ABS"), XCOFF::N_ABS}, |
| {StringRef("N_UNDEF"), XCOFF::N_UNDEF}}; |
| XCOFFYAML::FileHeader InitFileHdr = Obj.Header; |
| XCOFFYAML::AuxiliaryHeader InitAuxFileHdr; |
| std::vector<XCOFFYAML::Section> InitSections = Obj.Sections; |
| }; |
| |
| static void writeName(StringRef StrName, support::endian::Writer W) { |
| char Name[XCOFF::NameSize]; |
| memset(Name, 0, XCOFF::NameSize); |
| char SrcName[] = ""; |
| memcpy(Name, StrName.size() ? StrName.data() : SrcName, StrName.size()); |
| ArrayRef<char> NameRef(Name, XCOFF::NameSize); |
| W.write(NameRef); |
| } |
| |
| void XCOFFWriter::reportOverwrite(uint64_t CurrentOffset, |
| uint64_t specifiedOffset, |
| const Twine &fieldName) { |
| ErrHandler("current file offset (" + Twine(CurrentOffset) + |
| ") is bigger than the specified " + fieldName + " (" + |
| Twine(specifiedOffset) + ") "); |
| } |
| |
| bool XCOFFWriter::nameShouldBeInStringTable(StringRef SymbolName) { |
| // For XCOFF64: The symbol name is always in the string table. |
| return (SymbolName.size() > XCOFF::NameSize) || Is64Bit; |
| } |
| |
| bool XCOFFWriter::initRelocations(uint64_t &CurrentOffset) { |
| for (XCOFFYAML::Section &InitSection : InitSections) { |
| if (!InitSection.Relocations.empty()) { |
| uint64_t RelSize = Is64Bit ? XCOFF::RelocationSerializationSize64 |
| : XCOFF::RelocationSerializationSize32; |
| uint64_t UsedSize = RelSize * InitSection.Relocations.size(); |
| |
| // If NumberOfRelocations was specified, we use it, even if it's |
| // not consistent with the number of provided relocations. |
| if (!InitSection.NumberOfRelocations) |
| InitSection.NumberOfRelocations = InitSection.Relocations.size(); |
| |
| // If the YAML file specified an offset to relocations, we use it. |
| if (InitSection.FileOffsetToRelocations) { |
| if (CurrentOffset > InitSection.FileOffsetToRelocations) { |
| reportOverwrite(CurrentOffset, InitSection.FileOffsetToRelocations, |
| "FileOffsetToRelocations for the " + |
| InitSection.SectionName + " section"); |
| return false; |
| } |
| CurrentOffset = InitSection.FileOffsetToRelocations; |
| } else |
| InitSection.FileOffsetToRelocations = CurrentOffset; |
| CurrentOffset += UsedSize; |
| if (CurrentOffset > MaxRawDataSize) { |
| ErrHandler("maximum object size (" + Twine(MaxRawDataSize) + |
| ") exceeded when writing relocation data for section " + |
| Twine(InitSection.SectionName)); |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| bool XCOFFWriter::initSectionHeaders(uint64_t &CurrentOffset) { |
| uint64_t CurrentEndDataAddr = 0; |
| uint64_t CurrentEndTDataAddr = 0; |
| for (uint16_t I = 0, E = InitSections.size(); I < E; ++I) { |
| // Assign indices for sections. |
| if (InitSections[I].SectionName.size()) { |
| int16_t &SectionIndex = SectionIndexMap[InitSections[I].SectionName]; |
| if (!SectionIndex) { |
| // The section index starts from 1. |
| SectionIndex = I + 1; |
| if ((I + 1) > MaxSectionIndex) { |
| ErrHandler("exceeded the maximum permitted section index of " + |
| Twine(MaxSectionIndex)); |
| return false; |
| } |
| } |
| } |
| |
| if (!InitSections[I].Size) |
| InitSections[I].Size = InitSections[I].SectionData.binary_size(); |
| |
| // Section data addresses (physical/virtual) are related to symbol |
| // addresses and alignments. Furthermore, it is possible to specify the |
| // same starting addresses for the .text, .data, and .tdata sections. |
| // Without examining all the symbols and their addreses and alignments, |
| // it is not possible to compute valid section addresses. The only |
| // condition required by XCOFF is that the .bss section immediately |
| // follows the .data section, and the .tbss section immediately follows |
| // the .tdata section. Therefore, we only assign addresses to the .bss |
| // and .tbss sections if they do not already have non-zero addresses. |
| // (If the YAML file is being used to generate a valid object file, we |
| // expect all section addresses to be specified explicitly.) |
| switch (InitSections[I].Flags) { |
| case XCOFF::STYP_DATA: |
| CurrentEndDataAddr = InitSections[I].Address + InitSections[I].Size; |
| break; |
| case XCOFF::STYP_BSS: |
| if (!InitSections[I].Address) |
| InitSections[I].Address = CurrentEndDataAddr; |
| break; |
| case XCOFF::STYP_TDATA: |
| CurrentEndTDataAddr = InitSections[I].Address + InitSections[I].Size; |
| break; |
| case XCOFF::STYP_TBSS: |
| if (!InitSections[I].Address) |
| InitSections[I].Address = CurrentEndTDataAddr; |
| break; |
| } |
| |
| if (InitSections[I].SectionData.binary_size()) { |
| if (InitSections[I].FileOffsetToData) { |
| // Use the providedFileOffsetToData. |
| if (CurrentOffset > InitSections[I].FileOffsetToData) { |
| reportOverwrite(CurrentOffset, InitSections[I].FileOffsetToData, |
| "FileOffsetToData for the " + |
| InitSections[I].SectionName + " section"); |
| return false; |
| } |
| CurrentOffset = InitSections[I].FileOffsetToData; |
| } else { |
| CurrentOffset = alignTo(CurrentOffset, DefaultSectionAlign); |
| InitSections[I].FileOffsetToData = CurrentOffset; |
| } |
| CurrentOffset += InitSections[I].SectionData.binary_size(); |
| if (CurrentOffset > MaxRawDataSize) { |
| ErrHandler("maximum object size (" + Twine(MaxRawDataSize) + |
| ") exceeded when writing data for section " + Twine(I + 1) + |
| " (" + Twine(InitSections[I].SectionName) + ")"); |
| return false; |
| } |
| } |
| if (InitSections[I].SectionSubtype) { |
| uint32_t DWARFSubtype = |
| static_cast<uint32_t>(*InitSections[I].SectionSubtype); |
| if (InitSections[I].Flags != XCOFF::STYP_DWARF) { |
| ErrHandler("a DWARFSectionSubtype is only allowed for a DWARF section"); |
| return false; |
| } |
| unsigned Mask = Is64Bit ? XCOFFSectionHeader64::SectionFlagsTypeMask |
| : XCOFFSectionHeader32::SectionFlagsTypeMask; |
| if (DWARFSubtype & Mask) { |
| ErrHandler("the low-order bits of DWARFSectionSubtype must be 0"); |
| return false; |
| } |
| InitSections[I].Flags |= DWARFSubtype; |
| } |
| } |
| return initRelocations(CurrentOffset); |
| } |
| |
| bool XCOFFWriter::initStringTable() { |
| if (Obj.StrTbl.RawContent) { |
| size_t RawSize = Obj.StrTbl.RawContent->binary_size(); |
| if (Obj.StrTbl.Strings || Obj.StrTbl.Length) { |
| ErrHandler( |
| "can't specify Strings or Length when RawContent is specified"); |
| return false; |
| } |
| if (Obj.StrTbl.ContentSize && *Obj.StrTbl.ContentSize < RawSize) { |
| ErrHandler("specified ContentSize (" + Twine(*Obj.StrTbl.ContentSize) + |
| ") is less than the RawContent data size (" + Twine(RawSize) + |
| ")"); |
| return false; |
| } |
| return true; |
| } |
| if (Obj.StrTbl.ContentSize && *Obj.StrTbl.ContentSize <= 3) { |
| ErrHandler("ContentSize shouldn't be less than 4 without RawContent"); |
| return false; |
| } |
| |
| // Build the string table. |
| StrTblBuilder.clear(); |
| |
| if (Obj.StrTbl.Strings) { |
| // Add all specified strings to the string table. |
| for (StringRef StringEnt : *Obj.StrTbl.Strings) |
| StrTblBuilder.add(StringEnt); |
| |
| size_t StrTblIdx = 0; |
| size_t NumOfStrings = Obj.StrTbl.Strings->size(); |
| for (XCOFFYAML::Symbol &YamlSym : Obj.Symbols) { |
| if (nameShouldBeInStringTable(YamlSym.SymbolName)) { |
| if (StrTblIdx < NumOfStrings) { |
| // Overwrite the symbol name with the specified string. |
| YamlSym.SymbolName = (*Obj.StrTbl.Strings)[StrTblIdx]; |
| ++StrTblIdx; |
| } else |
| // Names that are not overwritten are still stored in the string |
| // table. |
| StrTblBuilder.add(YamlSym.SymbolName); |
| } |
| } |
| } else { |
| for (const XCOFFYAML::Symbol &YamlSym : Obj.Symbols) { |
| if (nameShouldBeInStringTable(YamlSym.SymbolName)) |
| StrTblBuilder.add(YamlSym.SymbolName); |
| } |
| } |
| |
| // Check if the file name in the File Auxiliary Entry should be added to the |
| // string table. |
| for (const XCOFFYAML::Symbol &YamlSym : Obj.Symbols) { |
| for (const std::unique_ptr<XCOFFYAML::AuxSymbolEnt> &AuxSym : |
| YamlSym.AuxEntries) { |
| if (auto AS = dyn_cast<XCOFFYAML::FileAuxEnt>(AuxSym.get())) |
| if (nameShouldBeInStringTable(AS->FileNameOrString.value_or(""))) |
| StrTblBuilder.add(AS->FileNameOrString.value_or("")); |
| } |
| } |
| |
| StrTblBuilder.finalize(); |
| |
| size_t StrTblSize = StrTblBuilder.getSize(); |
| if (Obj.StrTbl.ContentSize && *Obj.StrTbl.ContentSize < StrTblSize) { |
| ErrHandler("specified ContentSize (" + Twine(*Obj.StrTbl.ContentSize) + |
| ") is less than the size of the data that would otherwise be " |
| "written (" + |
| Twine(StrTblSize) + ")"); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool XCOFFWriter::initFileHeader(uint64_t CurrentOffset) { |
| // The default format of the object file is XCOFF32. |
| InitFileHdr.Magic = XCOFF::XCOFF32; |
| InitFileHdr.NumberOfSections = Obj.Sections.size(); |
| InitFileHdr.NumberOfSymTableEntries = Obj.Symbols.size(); |
| |
| for (XCOFFYAML::Symbol &YamlSym : Obj.Symbols) { |
| uint32_t AuxCount = YamlSym.AuxEntries.size(); |
| if (YamlSym.NumberOfAuxEntries && *YamlSym.NumberOfAuxEntries < AuxCount) { |
| ErrHandler("specified NumberOfAuxEntries " + |
| Twine(static_cast<uint32_t>(*YamlSym.NumberOfAuxEntries)) + |
| " is less than the actual number " |
| "of auxiliary entries " + |
| Twine(AuxCount)); |
| return false; |
| } |
| YamlSym.NumberOfAuxEntries = YamlSym.NumberOfAuxEntries.value_or(AuxCount); |
| // Add the number of auxiliary symbols to the total number. |
| InitFileHdr.NumberOfSymTableEntries += *YamlSym.NumberOfAuxEntries; |
| } |
| |
| // Calculate SymbolTableOffset for the file header. |
| if (InitFileHdr.NumberOfSymTableEntries) { |
| if (Obj.Header.SymbolTableOffset) { |
| if (CurrentOffset > Obj.Header.SymbolTableOffset) { |
| reportOverwrite(CurrentOffset, Obj.Header.SymbolTableOffset, |
| "SymbolTableOffset"); |
| return false; |
| } |
| CurrentOffset = Obj.Header.SymbolTableOffset; |
| } |
| InitFileHdr.SymbolTableOffset = CurrentOffset; |
| CurrentOffset += |
| InitFileHdr.NumberOfSymTableEntries * XCOFF::SymbolTableEntrySize; |
| if (CurrentOffset > MaxRawDataSize) { |
| ErrHandler("maximum object size of " + Twine(MaxRawDataSize) + |
| " exceeded when writing symbols"); |
| return false; |
| } |
| } |
| // TODO: Calculate FileOffsetToLineNumbers when line number supported. |
| return true; |
| } |
| |
| void XCOFFWriter::initAuxFileHeader() { |
| if (Obj.AuxHeader) |
| InitAuxFileHdr = *Obj.AuxHeader; |
| // In general, an object file might contain multiple sections of a given type, |
| // but in a loadable module, there must be exactly one .text, .data, .bss, and |
| // .loader section. A loadable object might also have one .tdata section and |
| // one .tbss section. |
| // Set these section-related values if not set explicitly. We assume that the |
| // input YAML matches the format of the loadable object, but if multiple input |
| // sections still have the same type, the first section with that type |
| // prevails. |
| for (uint16_t I = 0, E = InitSections.size(); I < E; ++I) { |
| switch (InitSections[I].Flags) { |
| case XCOFF::STYP_TEXT: |
| if (!InitAuxFileHdr.TextSize) |
| InitAuxFileHdr.TextSize = InitSections[I].Size; |
| if (!InitAuxFileHdr.TextStartAddr) |
| InitAuxFileHdr.TextStartAddr = InitSections[I].Address; |
| if (!InitAuxFileHdr.SecNumOfText) |
| InitAuxFileHdr.SecNumOfText = I + 1; |
| break; |
| case XCOFF::STYP_DATA: |
| if (!InitAuxFileHdr.InitDataSize) |
| InitAuxFileHdr.InitDataSize = InitSections[I].Size; |
| if (!InitAuxFileHdr.DataStartAddr) |
| InitAuxFileHdr.DataStartAddr = InitSections[I].Address; |
| if (!InitAuxFileHdr.SecNumOfData) |
| InitAuxFileHdr.SecNumOfData = I + 1; |
| break; |
| case XCOFF::STYP_BSS: |
| if (!InitAuxFileHdr.BssDataSize) |
| InitAuxFileHdr.BssDataSize = InitSections[I].Size; |
| if (!InitAuxFileHdr.SecNumOfBSS) |
| InitAuxFileHdr.SecNumOfBSS = I + 1; |
| break; |
| case XCOFF::STYP_TDATA: |
| if (!InitAuxFileHdr.SecNumOfTData) |
| InitAuxFileHdr.SecNumOfTData = I + 1; |
| break; |
| case XCOFF::STYP_TBSS: |
| if (!InitAuxFileHdr.SecNumOfTBSS) |
| InitAuxFileHdr.SecNumOfTBSS = I + 1; |
| break; |
| case XCOFF::STYP_LOADER: |
| if (!InitAuxFileHdr.SecNumOfLoader) |
| InitAuxFileHdr.SecNumOfLoader = I + 1; |
| break; |
| default: |
| break; |
| } |
| } |
| } |
| |
| bool XCOFFWriter::assignAddressesAndIndices() { |
| uint64_t FileHdrSize = |
| Is64Bit ? XCOFF::FileHeaderSize64 : XCOFF::FileHeaderSize32; |
| |
| // If AuxHeaderSize is specified in the YAML file, we construct |
| // an auxiliary header. |
| uint64_t AuxFileHdrSize = 0; |
| |
| if (Obj.Header.AuxHeaderSize) |
| AuxFileHdrSize = Obj.Header.AuxHeaderSize; |
| else if (Obj.AuxHeader) |
| AuxFileHdrSize = |
| (Is64Bit ? XCOFF::AuxFileHeaderSize64 : XCOFF::AuxFileHeaderSize32); |
| uint64_t SecHdrSize = |
| Is64Bit ? XCOFF::SectionHeaderSize64 : XCOFF::SectionHeaderSize32; |
| uint64_t CurrentOffset = |
| FileHdrSize + AuxFileHdrSize + InitSections.size() * SecHdrSize; |
| |
| // Calculate section header info. |
| if (!initSectionHeaders(CurrentOffset)) |
| return false; |
| |
| // Calculate file header info. |
| if (!initFileHeader(CurrentOffset)) |
| return false; |
| InitFileHdr.AuxHeaderSize = AuxFileHdrSize; |
| |
| // Initialize the auxiliary file header. |
| if (AuxFileHdrSize) |
| initAuxFileHeader(); |
| |
| // Initialize the string table. |
| return initStringTable(); |
| } |
| |
| void XCOFFWriter::writeFileHeader() { |
| W.write<uint16_t>(Obj.Header.Magic ? Obj.Header.Magic : InitFileHdr.Magic); |
| W.write<uint16_t>(Obj.Header.NumberOfSections ? Obj.Header.NumberOfSections |
| : InitFileHdr.NumberOfSections); |
| W.write<int32_t>(Obj.Header.TimeStamp); |
| if (Is64Bit) { |
| W.write<uint64_t>(InitFileHdr.SymbolTableOffset); |
| W.write<uint16_t>(InitFileHdr.AuxHeaderSize); |
| W.write<uint16_t>(Obj.Header.Flags); |
| W.write<int32_t>(Obj.Header.NumberOfSymTableEntries |
| ? Obj.Header.NumberOfSymTableEntries |
| : InitFileHdr.NumberOfSymTableEntries); |
| } else { |
| W.write<uint32_t>(InitFileHdr.SymbolTableOffset); |
| W.write<int32_t>(Obj.Header.NumberOfSymTableEntries |
| ? Obj.Header.NumberOfSymTableEntries |
| : InitFileHdr.NumberOfSymTableEntries); |
| W.write<uint16_t>(InitFileHdr.AuxHeaderSize); |
| W.write<uint16_t>(Obj.Header.Flags); |
| } |
| } |
| |
| void XCOFFWriter::writeAuxFileHeader() { |
| W.write<uint16_t>(InitAuxFileHdr.Magic.value_or(yaml::Hex16(1))); |
| W.write<uint16_t>(InitAuxFileHdr.Version.value_or(yaml::Hex16(1))); |
| if (Is64Bit) { |
| W.OS.write_zeros(4); // Reserved for debugger. |
| W.write<uint64_t>(InitAuxFileHdr.TextStartAddr.value_or(yaml::Hex64(0))); |
| W.write<uint64_t>(InitAuxFileHdr.DataStartAddr.value_or(yaml::Hex64(0))); |
| W.write<uint64_t>(InitAuxFileHdr.TOCAnchorAddr.value_or(yaml::Hex64(0))); |
| } else { |
| W.write<uint32_t>(InitAuxFileHdr.TextSize.value_or(yaml::Hex64(0))); |
| W.write<uint32_t>(InitAuxFileHdr.InitDataSize.value_or(yaml::Hex64(0))); |
| W.write<uint32_t>(InitAuxFileHdr.BssDataSize.value_or(yaml::Hex64(0))); |
| W.write<uint32_t>(InitAuxFileHdr.EntryPointAddr.value_or(yaml::Hex64(0))); |
| W.write<uint32_t>(InitAuxFileHdr.TextStartAddr.value_or(yaml::Hex64(0))); |
| W.write<uint32_t>(InitAuxFileHdr.DataStartAddr.value_or(yaml::Hex64(0))); |
| // A short 32-bit auxiliary header ends here. |
| if (InitFileHdr.AuxHeaderSize == XCOFF::AuxFileHeaderSizeShort) |
| return; |
| W.write<uint32_t>(InitAuxFileHdr.TOCAnchorAddr.value_or(yaml::Hex64(0))); |
| } |
| W.write<uint16_t>(InitAuxFileHdr.SecNumOfEntryPoint.value_or(0)); |
| W.write<uint16_t>(InitAuxFileHdr.SecNumOfText.value_or(0)); |
| W.write<uint16_t>(InitAuxFileHdr.SecNumOfData.value_or(0)); |
| W.write<uint16_t>(InitAuxFileHdr.SecNumOfTOC.value_or(0)); |
| W.write<uint16_t>(InitAuxFileHdr.SecNumOfLoader.value_or(0)); |
| W.write<uint16_t>(InitAuxFileHdr.SecNumOfBSS.value_or(0)); |
| W.write<uint16_t>(InitAuxFileHdr.MaxAlignOfText.value_or(yaml::Hex16(0))); |
| W.write<uint16_t>(InitAuxFileHdr.MaxAlignOfData.value_or(yaml::Hex16(0))); |
| W.write<uint16_t>(InitAuxFileHdr.ModuleType.value_or(yaml::Hex16(0))); |
| W.write<uint8_t>(InitAuxFileHdr.CpuFlag.value_or(yaml::Hex8(0))); |
| W.write<uint8_t>(0); // Reserved for CPU type. |
| if (Is64Bit) { |
| W.write<uint8_t>(InitAuxFileHdr.TextPageSize.value_or(yaml::Hex8(0))); |
| W.write<uint8_t>(InitAuxFileHdr.DataPageSize.value_or(yaml::Hex8(0))); |
| W.write<uint8_t>(InitAuxFileHdr.StackPageSize.value_or(yaml::Hex8(0))); |
| W.write<uint8_t>( |
| InitAuxFileHdr.FlagAndTDataAlignment.value_or(yaml::Hex8(0x80))); |
| W.write<uint64_t>(InitAuxFileHdr.TextSize.value_or(yaml::Hex64(0))); |
| W.write<uint64_t>(InitAuxFileHdr.InitDataSize.value_or(yaml::Hex64(0))); |
| W.write<uint64_t>(InitAuxFileHdr.BssDataSize.value_or(yaml::Hex64(0))); |
| W.write<uint64_t>(InitAuxFileHdr.EntryPointAddr.value_or(yaml::Hex64(0))); |
| W.write<uint64_t>(InitAuxFileHdr.MaxStackSize.value_or(yaml::Hex64(0))); |
| W.write<uint64_t>(InitAuxFileHdr.MaxDataSize.value_or(yaml::Hex64(0))); |
| } else { |
| W.write<uint32_t>(InitAuxFileHdr.MaxStackSize.value_or(yaml::Hex64(0))); |
| W.write<uint32_t>(InitAuxFileHdr.MaxDataSize.value_or(yaml::Hex64(0))); |
| W.OS.write_zeros(4); // Reserved for debugger. |
| W.write<uint8_t>(InitAuxFileHdr.TextPageSize.value_or(yaml::Hex8(0))); |
| W.write<uint8_t>(InitAuxFileHdr.DataPageSize.value_or(yaml::Hex8(0))); |
| W.write<uint8_t>(InitAuxFileHdr.StackPageSize.value_or(yaml::Hex8(0))); |
| W.write<uint8_t>( |
| InitAuxFileHdr.FlagAndTDataAlignment.value_or(yaml::Hex8(0))); |
| } |
| W.write<uint16_t>(InitAuxFileHdr.SecNumOfTData.value_or(0)); |
| W.write<uint16_t>(InitAuxFileHdr.SecNumOfTBSS.value_or(0)); |
| if (Is64Bit) { |
| W.write<uint16_t>( |
| InitAuxFileHdr.Flag.value_or(yaml::Hex16(XCOFF::SHR_SYMTAB))); |
| if (InitFileHdr.AuxHeaderSize > XCOFF::AuxFileHeaderSize64) |
| W.OS.write_zeros(InitFileHdr.AuxHeaderSize - XCOFF::AuxFileHeaderSize64); |
| } else { |
| if (InitFileHdr.AuxHeaderSize > XCOFF::AuxFileHeaderSize32) |
| W.OS.write_zeros(InitFileHdr.AuxHeaderSize - XCOFF::AuxFileHeaderSize32); |
| } |
| } |
| |
| void XCOFFWriter::writeSectionHeaders() { |
| for (uint16_t I = 0, E = Obj.Sections.size(); I < E; ++I) { |
| XCOFFYAML::Section DerivedSec = InitSections[I]; |
| writeName(DerivedSec.SectionName, W); |
| if (Is64Bit) { |
| // Virtual address is the same as physical address. |
| W.write<uint64_t>(DerivedSec.Address); // Physical address |
| W.write<uint64_t>(DerivedSec.Address); // Virtual address |
| W.write<uint64_t>(DerivedSec.Size); |
| W.write<uint64_t>(DerivedSec.FileOffsetToData); |
| W.write<uint64_t>(DerivedSec.FileOffsetToRelocations); |
| W.write<uint64_t>(DerivedSec.FileOffsetToLineNumbers); |
| W.write<uint32_t>(DerivedSec.NumberOfRelocations); |
| W.write<uint32_t>(DerivedSec.NumberOfLineNumbers); |
| W.write<int32_t>(DerivedSec.Flags); |
| W.OS.write_zeros(4); |
| } else { |
| // Virtual address is the same as physical address. |
| W.write<uint32_t>(DerivedSec.Address); // Physical address |
| W.write<uint32_t>(DerivedSec.Address); // Virtual address |
| W.write<uint32_t>(DerivedSec.Size); |
| W.write<uint32_t>(DerivedSec.FileOffsetToData); |
| W.write<uint32_t>(DerivedSec.FileOffsetToRelocations); |
| W.write<uint32_t>(DerivedSec.FileOffsetToLineNumbers); |
| W.write<uint16_t>(DerivedSec.NumberOfRelocations); |
| W.write<uint16_t>(DerivedSec.NumberOfLineNumbers); |
| W.write<int32_t>(DerivedSec.Flags); |
| } |
| } |
| } |
| |
| bool XCOFFWriter::writeSectionData() { |
| for (uint16_t I = 0, E = Obj.Sections.size(); I < E; ++I) { |
| XCOFFYAML::Section YamlSec = Obj.Sections[I]; |
| if (YamlSec.SectionData.binary_size()) { |
| // Fill the padding size with zeros. |
| int64_t PaddingSize = (uint64_t)InitSections[I].FileOffsetToData - |
| (W.OS.tell() - StartOffset); |
| if (PaddingSize < 0) { |
| ErrHandler("redundant data was written before section data"); |
| return false; |
| } |
| W.OS.write_zeros(PaddingSize); |
| YamlSec.SectionData.writeAsBinary(W.OS); |
| } |
| } |
| return true; |
| } |
| |
| bool XCOFFWriter::writeRelocations() { |
| for (uint16_t I = 0, E = Obj.Sections.size(); I < E; ++I) { |
| XCOFFYAML::Section YamlSec = Obj.Sections[I]; |
| if (!YamlSec.Relocations.empty()) { |
| int64_t PaddingSize = |
| InitSections[I].FileOffsetToRelocations - (W.OS.tell() - StartOffset); |
| if (PaddingSize < 0) { |
| ErrHandler("redundant data was written before relocations"); |
| return false; |
| } |
| W.OS.write_zeros(PaddingSize); |
| for (const XCOFFYAML::Relocation &YamlRel : YamlSec.Relocations) { |
| if (Is64Bit) |
| W.write<uint64_t>(YamlRel.VirtualAddress); |
| else |
| W.write<uint32_t>(YamlRel.VirtualAddress); |
| W.write<uint32_t>(YamlRel.SymbolIndex); |
| W.write<uint8_t>(YamlRel.Info); |
| W.write<uint8_t>(YamlRel.Type); |
| } |
| } |
| } |
| return true; |
| } |
| |
| bool XCOFFWriter::writeAuxSymbol(const XCOFFYAML::CsectAuxEnt &AuxSym) { |
| uint8_t SymAlignAndType = 0; |
| if (AuxSym.SymbolAlignmentAndType) { |
| if (AuxSym.SymbolType || AuxSym.SymbolAlignment) { |
| ErrHandler("cannot specify SymbolType or SymbolAlignment if " |
| "SymbolAlignmentAndType is specified"); |
| return false; |
| } |
| SymAlignAndType = *AuxSym.SymbolAlignmentAndType; |
| } else { |
| if (AuxSym.SymbolType) { |
| uint8_t SymbolType = *AuxSym.SymbolType; |
| if (SymbolType & ~XCOFFCsectAuxRef::SymbolTypeMask) { |
| ErrHandler("symbol type must be less than " + |
| Twine(1 + XCOFFCsectAuxRef::SymbolTypeMask)); |
| return false; |
| } |
| SymAlignAndType = SymbolType; |
| } |
| if (AuxSym.SymbolAlignment) { |
| const uint8_t ShiftedSymbolAlignmentMask = |
| XCOFFCsectAuxRef::SymbolAlignmentMask >> |
| XCOFFCsectAuxRef::SymbolAlignmentBitOffset; |
| |
| if (*AuxSym.SymbolAlignment & ~ShiftedSymbolAlignmentMask) { |
| ErrHandler("symbol alignment must be less than " + |
| Twine(1 + ShiftedSymbolAlignmentMask)); |
| return false; |
| } |
| SymAlignAndType |= (*AuxSym.SymbolAlignment |
| << XCOFFCsectAuxRef::SymbolAlignmentBitOffset); |
| } |
| } |
| if (Is64Bit) { |
| W.write<uint32_t>(AuxSym.SectionOrLengthLo.value_or(0)); |
| W.write<uint32_t>(AuxSym.ParameterHashIndex.value_or(0)); |
| W.write<uint16_t>(AuxSym.TypeChkSectNum.value_or(0)); |
| W.write<uint8_t>(SymAlignAndType); |
| W.write<uint8_t>(AuxSym.StorageMappingClass.value_or(XCOFF::XMC_PR)); |
| W.write<uint32_t>(AuxSym.SectionOrLengthHi.value_or(0)); |
| W.write<uint8_t>(0); |
| W.write<uint8_t>(XCOFF::AUX_CSECT); |
| } else { |
| W.write<uint32_t>(AuxSym.SectionOrLength.value_or(0)); |
| W.write<uint32_t>(AuxSym.ParameterHashIndex.value_or(0)); |
| W.write<uint16_t>(AuxSym.TypeChkSectNum.value_or(0)); |
| W.write<uint8_t>(SymAlignAndType); |
| W.write<uint8_t>(AuxSym.StorageMappingClass.value_or(XCOFF::XMC_PR)); |
| W.write<uint32_t>(AuxSym.StabInfoIndex.value_or(0)); |
| W.write<uint16_t>(AuxSym.StabSectNum.value_or(0)); |
| } |
| return true; |
| } |
| |
| bool XCOFFWriter::writeAuxSymbol(const XCOFFYAML::ExcpetionAuxEnt &AuxSym) { |
| assert(Is64Bit && "can't write the exception auxiliary symbol for XCOFF32"); |
| W.write<uint64_t>(AuxSym.OffsetToExceptionTbl.value_or(0)); |
| W.write<uint32_t>(AuxSym.SizeOfFunction.value_or(0)); |
| W.write<uint32_t>(AuxSym.SymIdxOfNextBeyond.value_or(0)); |
| W.write<uint8_t>(0); |
| W.write<uint8_t>(XCOFF::AUX_EXCEPT); |
| return true; |
| } |
| |
| bool XCOFFWriter::writeAuxSymbol(const XCOFFYAML::FunctionAuxEnt &AuxSym) { |
| if (Is64Bit) { |
| W.write<uint64_t>(AuxSym.PtrToLineNum.value_or(0)); |
| W.write<uint32_t>(AuxSym.SizeOfFunction.value_or(0)); |
| W.write<uint32_t>(AuxSym.SymIdxOfNextBeyond.value_or(0)); |
| W.write<uint8_t>(0); |
| W.write<uint8_t>(XCOFF::AUX_FCN); |
| } else { |
| W.write<uint32_t>(AuxSym.OffsetToExceptionTbl.value_or(0)); |
| W.write<uint32_t>(AuxSym.SizeOfFunction.value_or(0)); |
| W.write<uint32_t>(AuxSym.PtrToLineNum.value_or(0)); |
| W.write<uint32_t>(AuxSym.SymIdxOfNextBeyond.value_or(0)); |
| W.OS.write_zeros(2); |
| } |
| return true; |
| } |
| |
| bool XCOFFWriter::writeAuxSymbol(const XCOFFYAML::FileAuxEnt &AuxSym) { |
| StringRef FileName = AuxSym.FileNameOrString.value_or(""); |
| if (nameShouldBeInStringTable(FileName)) { |
| W.write<int32_t>(0); |
| W.write<uint32_t>(StrTblBuilder.getOffset(FileName)); |
| } else { |
| writeName(FileName, W); |
| } |
| W.OS.write_zeros(XCOFF::FileNamePadSize); |
| W.write<uint8_t>(AuxSym.FileStringType.value_or(XCOFF::XFT_FN)); |
| if (Is64Bit) { |
| W.OS.write_zeros(2); |
| W.write<uint8_t>(XCOFF::AUX_FILE); |
| } else { |
| W.OS.write_zeros(3); |
| } |
| return true; |
| } |
| |
| bool XCOFFWriter::writeAuxSymbol(const XCOFFYAML::BlockAuxEnt &AuxSym) { |
| if (Is64Bit) { |
| W.write<uint32_t>(AuxSym.LineNum.value_or(0)); |
| W.OS.write_zeros(13); |
| W.write<uint8_t>(XCOFF::AUX_SYM); |
| } else { |
| W.OS.write_zeros(2); |
| W.write<uint16_t>(AuxSym.LineNumHi.value_or(0)); |
| W.write<uint16_t>(AuxSym.LineNumLo.value_or(0)); |
| W.OS.write_zeros(12); |
| } |
| return true; |
| } |
| |
| bool XCOFFWriter::writeAuxSymbol(const XCOFFYAML::SectAuxEntForDWARF &AuxSym) { |
| if (Is64Bit) { |
| W.write<uint64_t>(AuxSym.LengthOfSectionPortion.value_or(0)); |
| W.write<uint64_t>(AuxSym.NumberOfRelocEnt.value_or(0)); |
| W.write<uint8_t>(0); |
| W.write<uint8_t>(XCOFF::AUX_SECT); |
| } else { |
| W.write<uint32_t>(AuxSym.LengthOfSectionPortion.value_or(0)); |
| W.OS.write_zeros(4); |
| W.write<uint32_t>(AuxSym.NumberOfRelocEnt.value_or(0)); |
| W.OS.write_zeros(6); |
| } |
| return true; |
| } |
| |
| bool XCOFFWriter::writeAuxSymbol(const XCOFFYAML::SectAuxEntForStat &AuxSym) { |
| assert(!Is64Bit && "can't write the stat auxiliary symbol for XCOFF64"); |
| W.write<uint32_t>(AuxSym.SectionLength.value_or(0)); |
| W.write<uint16_t>(AuxSym.NumberOfRelocEnt.value_or(0)); |
| W.write<uint16_t>(AuxSym.NumberOfLineNum.value_or(0)); |
| W.OS.write_zeros(10); |
| return true; |
| } |
| |
| bool XCOFFWriter::writeAuxSymbol( |
| const std::unique_ptr<XCOFFYAML::AuxSymbolEnt> &AuxSym) { |
| if (auto AS = dyn_cast<XCOFFYAML::CsectAuxEnt>(AuxSym.get())) |
| return writeAuxSymbol(*AS); |
| else if (auto AS = dyn_cast<XCOFFYAML::FunctionAuxEnt>(AuxSym.get())) |
| return writeAuxSymbol(*AS); |
| else if (auto AS = dyn_cast<XCOFFYAML::ExcpetionAuxEnt>(AuxSym.get())) |
| return writeAuxSymbol(*AS); |
| else if (auto AS = dyn_cast<XCOFFYAML::FileAuxEnt>(AuxSym.get())) |
| return writeAuxSymbol(*AS); |
| else if (auto AS = dyn_cast<XCOFFYAML::BlockAuxEnt>(AuxSym.get())) |
| return writeAuxSymbol(*AS); |
| else if (auto AS = dyn_cast<XCOFFYAML::SectAuxEntForDWARF>(AuxSym.get())) |
| return writeAuxSymbol(*AS); |
| else if (auto AS = dyn_cast<XCOFFYAML::SectAuxEntForStat>(AuxSym.get())) |
| return writeAuxSymbol(*AS); |
| llvm_unreachable("unknown auxiliary symbol type"); |
| return false; |
| } |
| |
| bool XCOFFWriter::writeSymbols() { |
| int64_t PaddingSize = |
| InitFileHdr.SymbolTableOffset - (W.OS.tell() - StartOffset); |
| if (PaddingSize < 0) { |
| ErrHandler("redundant data was written before symbols"); |
| return false; |
| } |
| W.OS.write_zeros(PaddingSize); |
| for (const XCOFFYAML::Symbol &YamlSym : Obj.Symbols) { |
| if (Is64Bit) { |
| W.write<uint64_t>(YamlSym.Value); |
| W.write<uint32_t>(StrTblBuilder.getOffset(YamlSym.SymbolName)); |
| } else { |
| if (nameShouldBeInStringTable(YamlSym.SymbolName)) { |
| // For XCOFF32: A value of 0 indicates that the symbol name is in the |
| // string table. |
| W.write<int32_t>(0); |
| W.write<uint32_t>(StrTblBuilder.getOffset(YamlSym.SymbolName)); |
| } else { |
| writeName(YamlSym.SymbolName, W); |
| } |
| W.write<uint32_t>(YamlSym.Value); |
| } |
| if (YamlSym.SectionName) { |
| auto It = SectionIndexMap.find(*YamlSym.SectionName); |
| if (It == SectionIndexMap.end()) { |
| ErrHandler("the SectionName " + *YamlSym.SectionName + |
| " specified in the symbol does not exist"); |
| return false; |
| } |
| if (YamlSym.SectionIndex && It->second != *YamlSym.SectionIndex) { |
| ErrHandler("the SectionName " + *YamlSym.SectionName + |
| " and the SectionIndex (" + Twine(*YamlSym.SectionIndex) + |
| ") refer to different sections"); |
| return false; |
| } |
| W.write<int16_t>(It->second); |
| } else { |
| W.write<int16_t>(YamlSym.SectionIndex.value_or(0)); |
| } |
| W.write<uint16_t>(YamlSym.Type); |
| W.write<uint8_t>(YamlSym.StorageClass); |
| |
| uint8_t NumOfAuxSym = YamlSym.NumberOfAuxEntries.value_or(0); |
| W.write<uint8_t>(NumOfAuxSym); |
| |
| if (!NumOfAuxSym && !YamlSym.AuxEntries.size()) |
| continue; |
| |
| // Now write auxiliary entries. |
| if (!YamlSym.AuxEntries.size()) { |
| W.OS.write_zeros(XCOFF::SymbolTableEntrySize * NumOfAuxSym); |
| } else { |
| for (const std::unique_ptr<XCOFFYAML::AuxSymbolEnt> &AuxSym : |
| YamlSym.AuxEntries) { |
| if (!writeAuxSymbol(AuxSym)) |
| return false; |
| } |
| // Pad with zeros. |
| if (NumOfAuxSym > YamlSym.AuxEntries.size()) |
| W.OS.write_zeros(XCOFF::SymbolTableEntrySize * |
| (NumOfAuxSym - YamlSym.AuxEntries.size())); |
| } |
| } |
| return true; |
| } |
| |
| void XCOFFWriter::writeStringTable() { |
| if (Obj.StrTbl.RawContent) { |
| Obj.StrTbl.RawContent->writeAsBinary(W.OS); |
| if (Obj.StrTbl.ContentSize) { |
| assert(*Obj.StrTbl.ContentSize >= Obj.StrTbl.RawContent->binary_size() && |
| "Specified ContentSize is less than the RawContent size."); |
| W.OS.write_zeros(*Obj.StrTbl.ContentSize - |
| Obj.StrTbl.RawContent->binary_size()); |
| } |
| return; |
| } |
| |
| size_t StrTblBuilderSize = StrTblBuilder.getSize(); |
| // If neither Length nor ContentSize is specified, write the StrTblBuilder |
| // directly, which contains the auto-generated Length value. |
| if (!Obj.StrTbl.Length && !Obj.StrTbl.ContentSize) { |
| if (StrTblBuilderSize <= 4) |
| return; |
| StrTblBuilder.write(W.OS); |
| return; |
| } |
| |
| // Serialize the string table's content to a temporary buffer. |
| std::unique_ptr<WritableMemoryBuffer> Buf = |
| WritableMemoryBuffer::getNewMemBuffer(StrTblBuilderSize); |
| uint8_t *Ptr = reinterpret_cast<uint8_t *>(Buf->getBufferStart()); |
| StrTblBuilder.write(Ptr); |
| // Replace the first 4 bytes, which contain the auto-generated Length value, |
| // with the specified value. |
| memset(Ptr, 0, 4); |
| support::endian::write32be(Ptr, Obj.StrTbl.Length ? *Obj.StrTbl.Length |
| : *Obj.StrTbl.ContentSize); |
| // Copy the buffer content to the actual output stream. |
| W.OS.write(Buf->getBufferStart(), Buf->getBufferSize()); |
| // Add zeros as padding after strings. |
| if (Obj.StrTbl.ContentSize) { |
| assert(*Obj.StrTbl.ContentSize >= StrTblBuilderSize && |
| "Specified ContentSize is less than the StringTableBuilder size."); |
| W.OS.write_zeros(*Obj.StrTbl.ContentSize - StrTblBuilderSize); |
| } |
| } |
| |
| bool XCOFFWriter::writeXCOFF() { |
| if (!assignAddressesAndIndices()) |
| return false; |
| StartOffset = W.OS.tell(); |
| writeFileHeader(); |
| if (InitFileHdr.AuxHeaderSize) |
| writeAuxFileHeader(); |
| if (!Obj.Sections.empty()) { |
| writeSectionHeaders(); |
| if (!writeSectionData()) |
| return false; |
| if (!writeRelocations()) |
| return false; |
| } |
| if (!Obj.Symbols.empty() && !writeSymbols()) |
| return false; |
| writeStringTable(); |
| return true; |
| } |
| |
| } // end anonymous namespace |
| |
| namespace llvm { |
| namespace yaml { |
| |
| bool yaml2xcoff(XCOFFYAML::Object &Doc, raw_ostream &Out, ErrorHandler EH) { |
| XCOFFWriter Writer(Doc, Out, EH); |
| return Writer.writeXCOFF(); |
| } |
| |
| } // namespace yaml |
| } // namespace llvm |
