| //===- ELFFileFormat.cpp --------------------------------------------------===// |
| // |
| // The MCLinker Project |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| #include "mcld/LD/ELFFileFormat.h" |
| #include "mcld/Object/ObjectBuilder.h" |
| #include "mcld/Target/GNULDBackend.h" |
| |
| #include <llvm/Support/ELF.h> |
| |
| namespace mcld { |
| |
| ELFFileFormat::ELFFileFormat() |
| : f_pNULLSection(NULL), |
| f_pGOT(NULL), |
| f_pPLT(NULL), |
| f_pRelDyn(NULL), |
| f_pRelPlt(NULL), |
| f_pRelaDyn(NULL), |
| f_pRelaPlt(NULL), |
| f_pComment(NULL), |
| f_pData1(NULL), |
| f_pDebug(NULL), |
| f_pDynamic(NULL), |
| f_pDynStrTab(NULL), |
| f_pDynSymTab(NULL), |
| f_pFini(NULL), |
| f_pFiniArray(NULL), |
| f_pHashTab(NULL), |
| f_pInit(NULL), |
| f_pInitArray(NULL), |
| f_pInterp(NULL), |
| f_pLine(NULL), |
| f_pNote(NULL), |
| f_pPreInitArray(NULL), |
| f_pROData1(NULL), |
| f_pShStrTab(NULL), |
| f_pStrTab(NULL), |
| f_pSymTab(NULL), |
| f_pTBSS(NULL), |
| f_pTData(NULL), |
| f_pCtors(NULL), |
| f_pDataRelRo(NULL), |
| f_pDtors(NULL), |
| f_pEhFrame(NULL), |
| f_pEhFrameHdr(NULL), |
| f_pGCCExceptTable(NULL), |
| f_pGNUVersion(NULL), |
| f_pGNUVersionD(NULL), |
| f_pGNUVersionR(NULL), |
| f_pGOTPLT(NULL), |
| f_pJCR(NULL), |
| f_pNoteABITag(NULL), |
| f_pStab(NULL), |
| f_pStabStr(NULL), |
| f_pStack(NULL), |
| f_pStackNote(NULL), |
| f_pDataRelRoLocal(NULL), |
| f_pGNUHashTab(NULL) { |
| } |
| |
| void ELFFileFormat::initStdSections(ObjectBuilder& pBuilder, |
| unsigned int pBitClass) { |
| f_pTextSection = |
| pBuilder.CreateSection(".text", |
| LDFileFormat::TEXT, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_EXECINSTR, |
| 0x1); |
| f_pNULLSection = |
| pBuilder.CreateSection("", LDFileFormat::Null, llvm::ELF::SHT_NULL, 0x0); |
| f_pReadOnlySection = pBuilder.CreateSection(".rodata", |
| LDFileFormat::TEXT, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC, |
| 0x1); |
| |
| f_pBSSSection = |
| pBuilder.CreateSection(".bss", |
| LDFileFormat::BSS, |
| llvm::ELF::SHT_NOBITS, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE, |
| 0x1); |
| f_pComment = pBuilder.CreateSection( |
| ".comment", LDFileFormat::MetaData, llvm::ELF::SHT_PROGBITS, 0x0, 0x1); |
| f_pDataSection = |
| pBuilder.CreateSection(".data", |
| LDFileFormat::DATA, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE, |
| 0x1); |
| f_pData1 = pBuilder.CreateSection(".data1", |
| LDFileFormat::DATA, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE, |
| 0x1); |
| f_pDebug = pBuilder.CreateSection( |
| ".debug", LDFileFormat::Debug, llvm::ELF::SHT_PROGBITS, 0x0, 0x1); |
| f_pInit = |
| pBuilder.CreateSection(".init", |
| LDFileFormat::TEXT, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_EXECINSTR, |
| 0x1); |
| f_pInitArray = |
| pBuilder.CreateSection(".init_array", |
| LDFileFormat::DATA, |
| llvm::ELF::SHT_INIT_ARRAY, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE, |
| 0x1); |
| f_pFini = |
| pBuilder.CreateSection(".fini", |
| LDFileFormat::TEXT, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_EXECINSTR, |
| 0x1); |
| f_pFiniArray = |
| pBuilder.CreateSection(".fini_array", |
| LDFileFormat::DATA, |
| llvm::ELF::SHT_FINI_ARRAY, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE, |
| 0x1); |
| f_pLine = pBuilder.CreateSection( |
| ".line", LDFileFormat::Debug, llvm::ELF::SHT_PROGBITS, 0x0, 0x1); |
| f_pPreInitArray = |
| pBuilder.CreateSection(".preinit_array", |
| LDFileFormat::DATA, |
| llvm::ELF::SHT_PREINIT_ARRAY, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE, |
| 0x1); |
| // the definition of SHF_XXX attributes of rodata in Linux Standard Base |
| // conflicts with System V standard. We follow System V standard. |
| f_pROData1 = pBuilder.CreateSection(".rodata1", |
| LDFileFormat::TEXT, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC, |
| 0x1); |
| f_pShStrTab = pBuilder.CreateSection( |
| ".shstrtab", LDFileFormat::NamePool, llvm::ELF::SHT_STRTAB, 0x0, 0x1); |
| // In ELF Spec Book I, p1-16. If symbol table and string table are in |
| // loadable segments, set the attribute to SHF_ALLOC bit. But in the |
| // real world, this bit always turn off. |
| f_pSymTab = pBuilder.CreateSection(".symtab", |
| LDFileFormat::NamePool, |
| llvm::ELF::SHT_SYMTAB, |
| 0x0, |
| pBitClass / 8); |
| |
| f_pStrTab = pBuilder.CreateSection( |
| ".strtab", LDFileFormat::NamePool, llvm::ELF::SHT_STRTAB, 0x0, 0x1); |
| f_pTBSS = pBuilder.CreateSection( |
| ".tbss", |
| LDFileFormat::BSS, |
| llvm::ELF::SHT_NOBITS, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE | llvm::ELF::SHF_TLS, |
| 0x1); |
| f_pTData = pBuilder.CreateSection( |
| ".tdata", |
| LDFileFormat::DATA, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE | llvm::ELF::SHF_TLS, |
| 0x1); |
| |
| /// @ref 10.3.1.2, ISO/IEC 23360, Part 1:2010(E), p. 24. |
| f_pCtors = pBuilder.CreateSection(".ctors", |
| LDFileFormat::DATA, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE, |
| 0x1); |
| f_pDataRelRo = |
| pBuilder.CreateSection(".data.rel.ro", |
| LDFileFormat::DATA, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE, |
| 0x1); |
| f_pDtors = pBuilder.CreateSection(".dtors", |
| LDFileFormat::DATA, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE, |
| 0x1); |
| f_pEhFrame = pBuilder.CreateSection(".eh_frame", |
| LDFileFormat::EhFrame, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC, |
| 0x4); |
| f_pGCCExceptTable = pBuilder.CreateSection(".gcc_except_table", |
| LDFileFormat::GCCExceptTable, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC, |
| 0x4); |
| f_pGNUVersion = pBuilder.CreateSection(".gnu.version", |
| LDFileFormat::Version, |
| llvm::ELF::SHT_GNU_versym, |
| llvm::ELF::SHF_ALLOC, |
| 0x1); |
| f_pGNUVersionD = pBuilder.CreateSection(".gnu.version_d", |
| LDFileFormat::Version, |
| llvm::ELF::SHT_GNU_verdef, |
| llvm::ELF::SHF_ALLOC, |
| 0x1); |
| f_pGNUVersionR = pBuilder.CreateSection(".gnu.version_r", |
| LDFileFormat::Version, |
| llvm::ELF::SHT_GNU_verneed, |
| llvm::ELF::SHF_ALLOC, |
| 0x1); |
| f_pJCR = pBuilder.CreateSection(".jcr", |
| LDFileFormat::DATA, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE, |
| 0x1); |
| f_pStab = pBuilder.CreateSection( |
| ".stab", LDFileFormat::Debug, llvm::ELF::SHT_PROGBITS, 0x0, 0x1); |
| f_pStabStr = pBuilder.CreateSection( |
| ".stabstr", LDFileFormat::Debug, llvm::ELF::SHT_STRTAB, 0x0, 0x1); |
| f_pStackNote = pBuilder.CreateSection(".note.GNU-stack", |
| LDFileFormat::StackNote, |
| llvm::ELF::SHT_PROGBITS, |
| 0x0, |
| 0x1); |
| |
| /// @ref GCC convention, see http://www.airs.com/blog/archives/189 |
| f_pDataRelRoLocal = |
| pBuilder.CreateSection(".data.rel.ro.local", |
| LDFileFormat::DATA, |
| llvm::ELF::SHT_PROGBITS, |
| llvm::ELF::SHF_ALLOC | llvm::ELF::SHF_WRITE, |
| 0x1); |
| /// Initialize format dependent sections. (sections for executable and shared |
| /// objects) |
| initObjectFormat(pBuilder, pBitClass); |
| } |
| |
| } // namespace mcld |