1 //===- GNUInfo.h ----------------------------------------------------------===// 2 // 3 // The MCLinker Project 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 #ifndef MCLD_TARGET_GNU_INFO_H 10 #define MCLD_TARGET_GNU_INFO_H 11 #ifdef ENABLE_UNITTEST 12 #include <gtest.h> 13 #endif 14 #include <llvm/ADT/Triple.h> 15 #include <llvm/Support/ELF.h> 16 17 namespace mcld { 18 19 /** \class GNUInfo 20 * \brief GNUInfo records ELF-dependent and target-dependnet data fields 21 */ 22 class GNUInfo 23 { 24 public: 25 GNUInfo(const llvm::Triple& pTriple); 26 ~GNUInfo()27 virtual ~GNUInfo() { } 28 29 /// ELFVersion - the value of e_ident[EI_VERSION] ELFVersion()30 virtual uint8_t ELFVersion() const { return llvm::ELF::EV_CURRENT; } 31 32 /// The return value of machine() it the same as e_machine in the ELF header 33 virtual uint32_t machine() const = 0; 34 35 /// OSABI - the value of e_ident[EI_OSABI] 36 uint8_t OSABI() const; 37 38 /// ABIVersion - the value of e_ident[EI_ABIVRESION] ABIVersion()39 uint8_t ABIVersion() const { return 0x0; } 40 41 /// defaultTextSegmentAddr - target should specify its own default start address 42 /// of the text segment. esp. for exec. defaultTextSegmentAddr()43 virtual uint64_t defaultTextSegmentAddr() const { return 0x0; } 44 45 /// flags - the value of ElfXX_Ehdr::e_flags 46 virtual uint64_t flags() const = 0; 47 48 /// entry - the symbol name of the entry point entry()49 virtual const char* entry() const { return "_start"; } 50 51 /// dyld - the name of the default dynamic linker 52 /// target may override this function if needed. 53 /// @ref gnu ld, bfd/elf32-i386.c:521 dyld()54 virtual const char* dyld() const { return "/usr/lib/libc.so.1"; } 55 56 /// isDefaultExecStack - target should specify whether the stack is default 57 /// executable. If target favors another choice, please override this function isDefaultExecStack()58 virtual bool isDefaultExecStack() const { return true; } 59 60 /// commonPageSize - the common page size of the target machine, and we set it 61 /// to 4K here. If target favors the different size, please override this commonPageSize()62 virtual uint64_t commonPageSize() const { return 0x1000; } 63 64 /// abiPageSize - the abi page size of the target machine, and we set it to 4K 65 /// here. If target favors the different size, please override this function abiPageSize()66 virtual uint64_t abiPageSize() const { return 0x1000; } 67 68 private: 69 const llvm::Triple& m_Triple; 70 }; 71 72 } // namespace of mcld 73 74 #endif 75 76