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/**************************** elf.cpp ********************************* * Author: Agner Fog * Date created: 2006-07-18 * Last modified: 2021-05-28 * Version: 1.11 * Project: Binary tools for ForwardCom instruction set * Module: elf.cpp * Description: * Module for manipulating ForwardCom ELF files * * Class CELF is used for manipulating ELF files. * It includes functions for reading, interpreting, dumping files, * splitting into containers or joining containers into an ELF file * * This code is based on the ForwardCom ELF specification in elf_forwardcom.h. * I have included limited support for x86-64 ELF (e_machine == EM_X86_64) for * testing purposes. This may be removed. * * Copyright 2006-2021 GNU General Public License v. 3 http://www.gnu.org/licenses *****************************************************************************/ #include "stdafx.h" // File class names SIntTxt ELFFileClassNames[] = { {ELFCLASSNONE, "None"}, {ELFCLASS32, "32-bit object"}, {ELFCLASS64, "64-bit object"} }; // Data encoding names SIntTxt ELFDataEncodeNames[] = { {ELFDATANONE, "None"}, {ELFDATA2LSB, "Little Endian"}, {ELFDATA2MSB, "Big Endian"} }; // ABI names SIntTxt ELFABINames[] = { {ELFOSABI_SYSV, "System V"}, {ELFOSABI_HPUX, "HP-UX"}, {ELFOSABI_ARM, "ARM"}, {ELFOSABI_STANDALONE,"Embedded"}, {ELFOSABI_FORWARDCOM,"ForwardCom"} }; // File type names SIntTxt ELFFileTypeNames[] = { {ET_NONE, "None"}, {ET_REL, "Relocatable"}, {ET_EXEC, "Executable"}, {ET_DYN, "Shared object"}, {ET_CORE, "Core file"} }; // File header flag names SIntTxt ELFFileFlagNames[] = { {EF_INCOMPLETE, "Has unresolved references"}, {EF_RELINKABLE, "Relinkable"}, {EF_RELOCATE, "Relocate when loading"}, {EF_POSITION_DEPENDENT, "Position dependent"} }; // Section type names SIntTxt ELFSectionTypeNames[] = { {SHT_NULL, "None"}, {SHT_PROGBITS, "Program data"}, {SHT_SYMTAB, "Symbol table"}, {SHT_STRTAB, "String table"}, {SHT_RELA, "Relocation w addends"}, {SHT_NOTE, "Notes"}, {SHT_NOBITS, "uinitialized"}, {SHT_COMDAT, "Communal section"}, {SHT_LIST, "List"} // {SHT_HASH, "Symbol hash table"}, // {SHT_DYNAMIC, "Dynamic linking info"}, // {SHT_REL, "Relocation entries"}, // {SHT_SHLIB, "Reserved"}, // {SHT_DYNSYM, "Dynamic linker symbol table"}, // {SHT_GROUP, "Section group"}, }; // Program header type names SIntTxt ELFPTypeNames[] = { {PT_NULL, "Unused"}, {PT_LOAD, "Loadable program segment"}, {PT_DYNAMIC, "Dynamic linking information"}, {PT_INTERP, "Program interpreter"}, {PT_NOTE, "Auxiliary information"}, {PT_SHLIB, "Reserved"}, {PT_PHDR, "Entry for header table itself"} }; // Section flag names SIntTxt ELFSectionFlagNames[] = { {SHF_EXEC, "executable"}, {SHF_WRITE, "writeable"}, {SHF_READ, "readable"}, {SHF_ALLOC, "allocate"}, {SHF_IP, "IP"}, {SHF_DATAP, "DATAP"}, {SHF_THREADP, "THREADP"}, {SHF_MERGE, "merge"}, {SHF_STRINGS, "strings"}, {SHF_INFO_LINK, "sh_info"}, {SHF_EVENT_HND, "event handler"}, {SHF_DEBUG_INFO, "debug info"}, {SHF_COMMENT, "comment"}, {SHF_RELINK, "relinkable"}, {SHF_AUTOGEN, "auto-generated"} }; // Symbol binding names SIntTxt ELFSymbolBindingNames[] = { {STB_LOCAL, "local"}, {STB_GLOBAL, "global"}, {STB_WEAK, "weak"}, {STB_WEAK2, "weak2"}, {STB_UNRESOLVED, "unresolved"} }; // Symbol Type names SIntTxt ELFSymbolTypeNames[] = { {STT_NOTYPE, "None"}, {STT_OBJECT, "Object"}, {STT_FUNC, "Function"}, {STT_SECTION, "Section"}, {STT_FILE, "File"}, {STT_CONSTANT, "Constant"} }; // Symbol st_other info names SIntTxt ELFSymbolInfoNames[] = { {STV_EXEC, "executable"}, {STV_READ, "read"}, {STV_WRITE, "write"}, {STV_IP, "ip"}, {STV_DATAP, "datap"}, {STV_THREADP, "threadp"}, {STV_REGUSE, "reguse"}, {STV_FLOAT, "float"}, {STV_STRING, "string"}, {STV_UNWIND, "unwind"}, {STV_DEBUG, "debug"}, {STV_COMMON, "communal"}, {STV_RELINK, "relinkable"}, {STV_MAIN, "main"}, {STV_EXPORTED, "exported"}, {STV_THREAD, "thread"} }; // Relocation type names x86 64 bit SIntTxt ELF64RelocationNames[] = { {R_X86_64_NONE, "None"}, {R_X86_64_64, "Direct 64 bit"}, {R_X86_64_PC32, "Self relative 32 bit signed"}, {R_X86_64_GOT32, "32 bit GOT entry"}, {R_X86_64_PLT32, "32 bit PLT address"}, {R_X86_64_COPY, "Copy symbol at runtime"}, {R_X86_64_GLOB_DAT, "Create GOT entry"}, {R_X86_64_JUMP_SLOT, "Create PLT entry"}, {R_X86_64_RELATIVE, "Adjust by program base"}, {R_X86_64_GOTPCREL, "32 bit signed pc relative offset to GOT"}, {R_X86_64_32, "Direct 32 bit zero extended"}, {R_X86_64_32S, "Direct 32 bit sign extended"}, {R_X86_64_16, "Direct 16 bit zero extended"}, {R_X86_64_PC16, "16 bit sign extended pc relative"}, {R_X86_64_8, "Direct 8 bit sign extended"}, {R_X86_64_PC8, "8 bit sign extended pc relative"}, {R_X86_64_IRELATIVE, "32 bit ref. to indirect function PLT"} }; // Relocation type names for ForwardCom SIntTxt ELFFwcRelocationTypes[] = { {R_FORW_ABS, "Absolute address"}, {R_FORW_SELFREL, "Self relative"}, {R_FORW_IP_BASE, "Relative to __ip_base"}, {R_FORW_DATAP, "Relative to __datap_base"}, {R_FORW_THREADP, "Relative to __threadp_base"}, {R_FORW_REFP, "Relative to arbitrary reference point"}, {R_FORW_SYSFUNC, "System function ID"}, {R_FORW_SYSMODUL, "System module ID"}, {R_FORW_SYSCALL, "System module and function ID"}, {R_FORW_DATASTACK, "Size of data stack"}, {R_FORW_CALLSTACK, "Size of call stack"}, {R_FORW_REGUSE, "Register use"} }; // Relocation sizes for ForwardCom SIntTxt ELFFwcRelocationSizes[] = { {R_FORW_NONE, "None"}, {R_FORW_8, "8 bit"}, {R_FORW_16, "16 bit"}, {R_FORW_24, "24 bit"}, {R_FORW_32, "32 bit"}, {R_FORW_64, "64 bit"}, {R_FORW_32LO, "Low 16 of 32 bits"}, {R_FORW_32HI, "High 16 of 32 bits"}, {R_FORW_64LO, "Low 32 of 64 bits"}, {R_FORW_64HI, "High 32 of 64 bits"} }; // Machine names SIntTxt ELFMachineNames[] = { {EM_NONE, "None"}, // No machine {EM_FORWARDCOM, "ForwardCom"}, {EM_M32, "AT&T WE 32100"}, {EM_SPARC, "SPARC"}, {EM_386, "Intel x86"}, {EM_68K, "Motorola m68k"}, {EM_88K, "Motorola m88k"}, {EM_860, "MIPS R3000 big-endian"}, {EM_MIPS, "MIPS R3000 big-endian"}, {EM_S370, "IBM System/370"}, {EM_MIPS_RS3_LE, "NMIPS R3000 little-endianone"}, {EM_PARISC, "HPPA"}, {EM_VPP500, "Fujitsu VPP500"}, {EM_SPARC32PLUS, "Sun v8plus"}, {EM_960, "Intel 80960"}, {EM_PPC, "PowerPC"}, {EM_PPC64, "PowerPC 64-bit"}, {EM_S390, "IBM S390"}, {EM_V800, "NEC V800"}, {EM_FR20, "Fujitsu FR20"}, {EM_RH32, "TRW RH-32"}, {EM_RCE, "Motorola RCE"}, {EM_ARM, "ARM"}, {EM_FAKE_ALPHA, "Digital Alpha"}, {EM_SH, "Hitachi SH"}, {EM_SPARCV9, "SPARC v9 64-bit"}, {EM_TRICORE, "Siemens Tricore"}, {EM_ARC, "Argonaut RISC"}, {EM_H8_300, "Hitachi H8/300"}, {EM_H8_300H, "Hitachi H8/300H"}, {EM_H8S, "Hitachi H8S"}, {EM_H8_500, "EM_H8_500"}, {EM_IA_64, "Intel IA64"}, {EM_MIPS_X, "Stanford MIPS-X"}, {EM_COLDFIRE, "Motorola Coldfire"}, {EM_68HC12, "Motorola M68HC12"}, {EM_MMA, "Fujitsu MMA"}, {EM_PCP, "Siemens PCP"}, {EM_NCPU, "Sony nCPU"}, {EM_NDR1, "Denso NDR1"}, {EM_STARCORE, "Motorola Start*Core"}, {EM_ME16, "Toyota ME16"}, {EM_ST100, "ST100"}, {EM_TINYJ, "Tinyj"}, {EM_X86_64, "x86-64"}, {EM_PDSP, "Sony DSP"}, {EM_FX66, "Siemens FX66"}, {EM_ST9PLUS, "ST9+ 8/16"}, {EM_ST7, "ST7 8"}, {EM_68HC16, "MC68HC16"}, {EM_68HC11, "MC68HC11"}, {EM_68HC08, "MC68HC08"}, {EM_68HC05, "MC68HC05"}, {EM_SVX, "SVx"}, {EM_AT19, "ST19"}, {EM_VAX, "VAX"}, {EM_CRIS, "Axis"}, {EM_JAVELIN, "Infineon"}, {EM_FIREPATH, "Element 14"}, {EM_ZSP, "LSI Logic"}, {EM_HUANY, "Harvard"}, {EM_PRISM, "SiTera Prism"}, {EM_AVR, "Atmel AVR"}, {EM_FR30, "FR30"}, {EM_D10V, "D10V"}, {EM_D30V, "D30V"}, {EM_V850, "NEC v850"}, {EM_M32R, "M32R"}, {EM_MN10300, "MN10300"}, {EM_MN10200, "MN10200"}, {EM_PJ, "picoJava"}, {EM_ALPHA, "Alpha"} }; // Class CELF members: // Constructor CELF::CELF() { zeroAllMembers(*this); } // ParseFile void CELF::parseFile() { // Load and parse file buffer uint32_t i; if (dataSize() == 0) { nSections = 0; return; } fileHeader = *(ElfFwcEhdr*)buf(); // Copy file header nSections = fileHeader.e_shnum; sectionHeaders.setNum(nSections); // Allocate space for section headers uint32_t symtabi = 0; // Index to symbol table // Find section headers sectionHeaderSize = fileHeader.e_shentsize; if (sectionHeaderSize <= 0) err.submit(ERR_ELF_RECORD_SIZE); uint32_t SectionOffset = uint32_t(fileHeader.e_shoff); // check header integrity if (fileHeader.e_phoff >= dataSize() || fileHeader.e_phoff + (uint32_t)fileHeader.e_phentsize * fileHeader.e_phnum > dataSize()) err.submit(ERR_ELF_INDEX_RANGE); if (fileHeader.e_shoff >= dataSize() || fileHeader.e_shoff + (uint32_t)fileHeader.e_shentsize * fileHeader.e_shnum > dataSize()) err.submit(ERR_ELF_INDEX_RANGE); if (fileHeader.e_shstrndx >= dataSize()) err.submit(ERR_ELF_INDEX_RANGE); if (err.number()) return; for (i = 0; i < nSections; i++) { sectionHeaders[i] = get<ElfFwcShdr>(SectionOffset); // check section header integrity if (sectionHeaders[i].sh_offset > dataSize() || (sectionHeaders[i].sh_offset + sectionHeaders[i].sh_size > dataSize() && sectionHeaders[i].sh_type != SHT_NOBITS) || sectionHeaders[i].sh_offset + sectionHeaders[i].sh_entsize > dataSize()) { err.submit(ERR_ELF_INDEX_RANGE); } SectionOffset += sectionHeaderSize; if (sectionHeaders[i].sh_type == SHT_SYMTAB) { // Symbol table found symtabi = i; } } if (SectionOffset > dataSize()) err.submit(ERR_ELF_INDEX_RANGE); // Section table points to outside file if (buf() && dataSize()) { // string table uint64_t offset = sectionHeaders[fileHeader.e_shstrndx].sh_offset; secStringTable = (char*)buf() + uint32_t(offset); secStringTableLen = uint32_t(sectionHeaders[fileHeader.e_shstrndx].sh_size); if (offset > dataSize() || offset + secStringTableLen > dataSize()) err.submit(ERR_ELF_INDEX_RANGE); } // check section names for (i = 0; i < nSections; i++) { if (sectionHeaders[i].sh_name >= secStringTableLen) { err.submit(ERR_ELF_STRING_TABLE); break; } } if (symtabi) { // Save offset to symbol table uint64_t offset = sectionHeaders[symtabi].sh_offset; symbolTableOffset = (uint32_t)offset; symbolTableEntrySize = (uint32_t)(sectionHeaders[symtabi].sh_entsize); // Entry size of symbol table if (symbolTableEntrySize == 0) { err.submit(ERR_ELF_SYMTAB_MISSING); return; } // Avoid division by zero symbolTableEntries = uint32_t(sectionHeaders[symtabi].sh_size) / symbolTableEntrySize; if (offset > dataSize() || offset > 0xFFFFFFFFU || offset + sectionHeaders[symtabi].sh_entsize > dataSize() || offset + sectionHeaders[symtabi].sh_size > dataSize()) err.submit(ERR_ELF_INDEX_RANGE); // Find associated string table uint32_t stringtabi = sectionHeaders[symtabi].sh_link; if (stringtabi >= nSections) { err.submit(ERR_ELF_INDEX_RANGE); return; } offset = sectionHeaders[stringtabi].sh_offset; symbolStringTableOffset = (uint32_t)offset; symbolStringTableSize = (uint32_t)(sectionHeaders[stringtabi].sh_size); if (offset > dataSize() || offset > 0xFFFFFFFFU || offset + sectionHeaders[stringtabi].sh_size > dataSize()) err.submit(ERR_ELF_INDEX_RANGE); // check all symbol names int8_t * symtab = buf() + symbolTableOffset; uint32_t symname = 0; for (uint32_t symi = 0; symi < symbolTableEntries; symi++) { // Copy ElfFwcSym symbol or convert Elf64_Sym symbol if (fileHeader.e_machine == EM_FORWARDCOM) { symname = ((ElfFwcSym*)symtab)[symi].st_name; } else { // x64 type symbol table entry symname = ((Elf64_Sym*)symtab)[symi].st_name; } if (symname >= symbolStringTableSize) err.submit(ERR_ELF_STRING_TABLE); } } } // Dump void CELF::dump(int options) { printf("\nDump of ELF file %s", cmd.getFilename(cmd.inputFile)); if (options == 0) options = DUMP_FILEHDR; if (options & DUMP_FILEHDR) { // File header printf("\n-----------------------------------------------"); printf("\nFile size: %i", dataSize()); printf("\nFile header:"); printf("\nFile class: %s, Data encoding: %s, ELF version %i, ABI: %s, ABI version %i", Lookup(ELFFileClassNames, fileHeader.e_ident[EI_CLASS]), Lookup(ELFDataEncodeNames, fileHeader.e_ident[EI_DATA]), fileHeader.e_ident[EI_VERSION], Lookup(ELFABINames, fileHeader.e_ident[EI_OSABI]), fileHeader.e_ident[EI_ABIVERSION]); printf("\nFile type: %s, Machine: %s, version: %i", Lookup(ELFFileTypeNames, fileHeader.e_type), Lookup(ELFMachineNames, fileHeader.e_machine), fileHeader.e_version); printf("\nNumber of sections: %2i", nSections); if (fileHeader.e_machine == EM_FORWARDCOM) { printf("\nip_base: 0x%X, datap_base: 0x%X, threadp_base: 0x%X, entry_point: 0x%X", (uint32_t)fileHeader.e_ip_base, (uint32_t)fileHeader.e_datap_base, (uint32_t)fileHeader.e_threadp_base, (uint32_t)fileHeader.e_entry); } } // Always show flags if (fileHeader.e_flags) { printf("\nFlags:"); for (int i = 0; i < 32; i++) { if (fileHeader.e_flags & (1 << i)) { printf(" %s,", Lookup(ELFFileFlagNames, 1 << i)); } } } if (options & DUMP_LINKMAP) { fprintf(stdout, "\nLink map:\n"); makeLinkMap(stdout); } if (options & DUMP_RELINKABLE) { // Show names of relinkable modules and libraries CDynamicArray<SLCommand> mnames; // list of relinkable modules CDynamicArray<SLCommand> lnames; // list of relinkable libraries SLCommand nameRec; // record containing name uint32_t r; // record index uint32_t sec; // section index const char * modName; // module name const char * libName; // library name // loop through sections for (sec = 0; sec < sectionHeaders.numEntries(); sec++) { ElfFwcShdr & secHdr = sectionHeaders[sec]; if (secHdr.sh_type == 0) continue; if (secHdr.sh_flags & SHF_RELINK) { // section is relinkable if (secHdr.sh_library && secHdr.sh_library < secStringTableLen) { libName = secStringTable + secHdr.sh_library; // library name nameRec.value = cmd.fileNameBuffer.pushString(libName); lnames.addUnique(nameRec); // add only one instance to lnames } if (secHdr.sh_module && secHdr.sh_module < secStringTableLen) { modName = secStringTable + secHdr.sh_module; // module name nameRec.value = cmd.fileNameBuffer.pushString(modName); mnames.addUnique(nameRec); // add only one instance to mnames } } } if (lnames.numEntries()) { printf("\n\nRelinkable libraries:"); for (r = 0; r < lnames.numEntries(); r++) { printf("\n %s", cmd.getFilename((uint32_t)lnames[r].value)); } } if (mnames.numEntries()) { printf("\n\nRelinkable modules:"); for (r = 0; r < mnames.numEntries(); r++) { printf("\n %s", cmd.getFilename((uint32_t)mnames[r].value)); } } } if ((options & DUMP_SECTHDR) && fileHeader.e_phnum) { // Dump program headers printf("\n\nProgram headers:"); uint32_t nProgramHeaders = fileHeader.e_phnum; uint32_t programHeaderSize = fileHeader.e_phentsize; if (nProgramHeaders && programHeaderSize <= 0) err.submit(ERR_ELF_RECORD_SIZE); uint32_t programHeaderOffset = (uint32_t)fileHeader.e_phoff; ElfFwcPhdr pHeader; for (uint32_t i = 0; i < nProgramHeaders; i++) { pHeader = get<ElfFwcPhdr>(programHeaderOffset); printf("\nProgram header Type: %s, flags 0x%X", Lookup(ELFPTypeNames, (uint32_t)pHeader.p_type), (uint32_t)pHeader.p_flags); printf("\noffset = 0x%X, vaddr = 0x%X, paddr = 0x%X, filesize = 0x%X, memsize = 0x%X, align = 0x%X", (uint32_t)pHeader.p_offset, (uint32_t)pHeader.p_vaddr, (uint32_t)pHeader.p_paddr, (uint32_t)pHeader.p_filesz, (uint32_t)pHeader.p_memsz, 1 << pHeader.p_align); programHeaderOffset += programHeaderSize; if (pHeader.p_filesz < 0x100 && (uint32_t)pHeader.p_offset < dataSize() && (pHeader.p_flags & SHF_STRINGS)) { printf("\nContents: %s", buf() + (int)pHeader.p_offset); } } } if (options & DUMP_SECTHDR) { // Dump section headers printf("\n\nSection headers:"); for (uint32_t sc = 0; sc < nSections; sc++) { // Get copy of 32-bit header or converted 64-bit header ElfFwcShdr sheader = sectionHeaders[sc]; uint32_t entrysize = (uint32_t)(sheader.sh_entsize); uint32_t namei = sheader.sh_name; if (namei >= secStringTableLen) { err.submit(ERR_ELF_STRING_TABLE); break; } printf("\n%2i Name: %-18s Type: %s", sc, secStringTable + namei, Lookup(ELFSectionTypeNames, sheader.sh_type)); if (sheader.sh_flags) { printf("\n Flags: 0x%X:", uint32_t(sheader.sh_flags)); for (uint32_t fi = 1; fi != 0; fi <<= 1) { if (uint32_t(sheader.sh_flags) & fi) { printf(" %s", Lookup(ELFSectionFlagNames, fi)); } } } //if (sheader.sh_addr) printf("\n Address: 0x%X", uint32_t(sheader.sh_addr)); if (sheader.sh_offset || sheader.sh_size) { printf("\n FileOffset: 0x%X, Size: 0x%X", uint32_t(sheader.sh_offset), uint32_t(sheader.sh_size)); } if (sheader.sh_align) { printf("\n Alignment: 0x%X", 1 << sheader.sh_align); } if (sheader.sh_entsize) { printf("\n Entry size: 0x%X", uint32_t(sheader.sh_entsize)); switch (sheader.sh_type) { /* case SHT_DYNAMIC: printf("\n String table: %i", sheader.sh_link); break; case SHT_HASH: printf("\n Symbol table: %i", sheader.sh_link); break; */ case SHT_RELA: // case SHT_REL: printf("\n Symbol table: %i", sheader.sh_link); break; case SHT_SYMTAB: //case SHT_DYNSYM: printf("\n Symbol string table: %i, First global symbol: %i", sheader.sh_link, sheader.sh_module); break; default: if (sheader.sh_link) { printf("\n Link: %i", sheader.sh_link); } if (sheader.sh_module) { printf("\n Info: %i", sheader.sh_module); } } } if (sheader.sh_module && sheader.sh_module < secStringTableLen) { printf("\n Module: %s", secStringTable + sheader.sh_module); if (sheader.sh_library) printf(", Library: %s", secStringTable + sheader.sh_library); } if (sheader.sh_type == SHT_STRTAB && (options & DUMP_STRINGTB)) { // Print string table printf("\n String table:"); char * p = (char*)buf() + uint32_t(sheader.sh_offset) + 1; uint32_t nread = 1, len; while (nread < uint32_t(sheader.sh_size)) { len = (uint32_t)strlen(p); printf(" >>%s<<", p); nread += len + 1; p += len + 1; } } if ((sheader.sh_type == SHT_SYMTAB) && (options & DUMP_SYMTAB)) { // Dump symbol table // Find associated string table if (sheader.sh_link >= (uint32_t)nSections) { err.submit(ERR_ELF_INDEX_RANGE); sheader.sh_link = 0; } uint64_t strtabOffset = sectionHeaders[sheader.sh_link].sh_offset; if (strtabOffset >= dataSize()) { err.submit(ERR_ELF_INDEX_RANGE); return; } int8_t * strtab = buf() + strtabOffset; // Find symbol table uint32_t symtabsize = (uint32_t)(sheader.sh_size); int8_t * symtab = buf() + uint32_t(sheader.sh_offset); int8_t * symtabend = symtab + symtabsize; if (entrysize < sizeof(Elf64_Sym)) { err.submit(ERR_ELF_RECORD_SIZE); entrysize = sizeof(Elf64_Sym); } printf("\n Symbols:"); // Loop through symbol table int symi; // Symbol number for (symi = 0; symtab < symtabend; symtab += entrysize, symi++) { // Copy ElfFwcSym symbol or convert Elf64_Sym symbol ElfFwcSym sym; if (fileHeader.e_machine == EM_FORWARDCOM) { sym = *(ElfFwcSym*)symtab; } else { // Translate x64 type symbol table entry Elf64_Sym sym64 = *(Elf64_Sym*)symtab; sym.st_name = sym64.st_name; sym.st_type = sym64.st_type; sym.st_bind = sym64.st_bind; sym.st_other = sym64.st_other; sym.st_section = sym64.st_section; sym.st_value = sym64.st_value; sym.st_unitsize = (uint32_t)sym64.st_size; sym.st_unitnum = 1; sym.st_reguse1 = sym.st_reguse2 = 0; } int type = sym.st_type; int binding = sym.st_bind; if (strtabOffset + sym.st_name >= dataSize()) err.submit(ERR_ELF_INDEX_RANGE); else if (*(strtab + sym.st_name)) { printf("\n %2i Name: %s,", symi, strtab + sym.st_name); } else { printf("\n %2i Unnamed,", symi); } if (sym.st_value || type == STT_OBJECT || type == STT_FUNC || (int16_t)sym.st_section == SHN_ABS_X86) { printf(" Value: 0x%X", uint32_t(sym.st_value)); } if (sym.st_unitsize) printf(" size: %X*%X", sym.st_unitsize, sym.st_unitnum); if (sym.st_other) { for (int i = 0; i < 32; i++) { if (sym.st_other & 1 << i) { printf(" %s", Lookup(ELFSymbolInfoNames, 1 << i)); } } } if (sym.st_reguse1 | sym.st_reguse2) { printf(", register use 0x%X, 0x%X", sym.st_reguse1, sym.st_reguse2); } //if (int32_t(sym.st_section) > 0) printf(", section: %i", sym.st_section); //else { // Special segment values if (sym.st_section == 0) { printf(" extern,"); } else if (sym.st_type == STT_CONSTANT) { printf(", absolute,"); } else { printf(", section: 0x%X", sym.st_section); } if (sym.st_type || sym.st_bind) { printf(" type: %s, binding: %s", Lookup(ELFSymbolTypeNames, type), Lookup(ELFSymbolBindingNames, binding)); } } } // Dump relocation table if ((sheader.sh_type == SHT_RELA) && (options & DUMP_RELTAB)) { printf("\n Relocations:"); int8_t * reltab = buf() + uint32_t(sheader.sh_offset); int8_t * reltabend = reltab + uint32_t(sheader.sh_size); /* uint32_t expectedentrysize = sheader.sh_type == SHT_RELA ? sizeof(Elf64_Rela) : // Elf32_Rela, Elf64_Rela sizeof(Elf64_Rela) - wordSize / 8; // Elf32_Rel, Elf64_Rel */ uint32_t expectedentrysize = sizeof(Elf64_Rela); if (entrysize < expectedentrysize) { err.submit(ERR_ELF_RECORD_SIZE); entrysize = expectedentrysize; } // Loop through entries for (; reltab < reltabend; reltab += entrysize) { // Copy relocation table entry with or without addend ElfFwcReloc rel = *(ElfFwcReloc*)reltab; const char * relocationName, *relocationSize; char text[128]; if (machineType == EM_X86_64) { relocationName = Lookup(ELF64RelocationNames, rel.r_type); } else if (machineType == EM_FORWARDCOM) { relocationName = Lookup(ELFFwcRelocationTypes, rel.r_type & R_FORW_RELTYPEMASK); relocationSize = Lookup(ELFFwcRelocationSizes, rel.r_type & R_FORW_RELSIZEMASK); sprintf(text, "%s, %s, scale by %i", relocationName, relocationSize, 1 << (rel.r_type & 0xFF)); relocationName = text; } else { relocationName = "unknown"; } memcpy(&rel, reltab, entrysize); printf("\n Section: %i, Offset: 0x%X, Symbol: %i, Name: %s\n Type: %s", rel.r_section, uint32_t(rel.r_offset), rel.r_sym, symbolName(rel.r_sym), relocationName); if (machineType == EM_FORWARDCOM && rel.r_type >> 16 == 8) { printf(", ref. point %i", rel.r_refsym); } if (uint32_t(rel.r_addend)) { printf(", Addend: 0x%X", uint32_t(rel.r_addend)); } /* Inline addend not used by ForwardCom // Find inline addend ElfFwcShdr relsheader = sectionHeaders[rel.r_section]; uint32_t relsoffset = uint32_t(relsheader.sh_offset); if (relsoffset + rel.r_offset < dataSize() && relsheader.sh_type != SHT_NOBITS) { int32_t * piaddend = (int32_t*)(buf() + relsoffset + rel.r_offset); if (*piaddend) printf(", Inline value: 0x%X", *piaddend); }*/ } } } } } // PublicNames void CELF::listSymbols(CMemoryBuffer * strings, CDynamicArray<SSymbolEntry> * index, uint32_t m, uint32_t l, int scope) { // Make list of public and external symbols, including weak symbols // SStringEntry::member is set to m and library is set to l; // scope: 1: exported, // 2: imported (includes STB_WEAK2), // 3: both // Interpret header: parseFile(); if (err.number()) return; // Loop through section headers for (uint32_t sc = 0; sc < nSections; sc++) { // Get copy of 32-bit header or converted 64-bit header ElfFwcShdr sheader = sectionHeaders[sc]; uint32_t entrysize = uint32_t(sheader.sh_entsize); if (sheader.sh_type == SHT_SYMTAB) { // Find associated string table if (sheader.sh_link >= (uint32_t)nSections) { err.submit(ERR_ELF_INDEX_RANGE); sheader.sh_link = 0; } int8_t * strtab = buf() + uint32_t(sectionHeaders[sheader.sh_link].sh_offset); // Find symbol table uint32_t symtabsize = uint32_t(sheader.sh_size); int8_t * symtab = buf() + uint32_t(sheader.sh_offset); int8_t * symtabend = symtab + symtabsize; if (entrysize < sizeof(Elf64_Sym)) { err.submit(ERR_ELF_RECORD_SIZE); entrysize = sizeof(Elf64_Sym); } // Loop through symbol table for (int symi = 0; symtab < symtabend; symtab += entrysize, symi++) { // Copy ElfFwcSym symbol table entry or convert Elf64_Sym bit entry ElfFwcSym sym; if (fileHeader.e_machine == EM_FORWARDCOM) { sym = *(ElfFwcSym*)symtab; } else { // Translate x64 type symbol table entry Elf64_Sym sym64 = *(Elf64_Sym*)symtab; sym.st_name = sym64.st_name; sym.st_type = sym64.st_type; sym.st_bind = sym64.st_bind; sym.st_other = sym64.st_other; sym.st_section = sym64.st_section; sym.st_value = sym64.st_value; sym.st_unitsize = (uint32_t)sym64.st_size; sym.st_unitnum = 1; sym.st_reguse1 = sym.st_reguse2 = 0; } int type = sym.st_type; int binding = sym.st_bind; if (type != STT_SECTION && type != STT_FILE && (binding & (STB_GLOBAL | STB_WEAK))) { // Public or external symbol found if (((scope & 1) && (sym.st_section != 0)) // scope 1: public || ((scope & 2) && (sym.st_section == 0 || binding == STB_WEAK2))) { // scope 2: external SSymbolEntry se; se.member = m; se.library = l; se.st_type = type; se.st_bind = binding; se.symindex = symi; se.sectioni = sym.st_section; se.st_other = (uint16_t)sym.st_other; se.status = (scope & 1) << 1; // Store name const char * name = (char*)strtab + sym.st_name; se.name = strings->pushString(name); // Store name index index->push(se); } } } } } } // get a symbol record ElfFwcSym * CELF::getSymbol(uint32_t symindex) { if (symbolTableOffset) { uint32_t symi = symbolTableOffset + symindex * symbolTableEntrySize; if (symi < dataSize()) { return &get<ElfFwcSym>(symi); } } return 0; } // SymbolName const char * CELF::symbolName(uint32_t index) { // Get name of symbol. (ParseFile() must be called first) const char * symname = 0; // Symbol name uint32_t symi; // Symbol index uint32_t stri; // String index if (symbolTableOffset) { symi = symbolTableOffset + index * symbolTableEntrySize; if (symi < dataSize()) { stri = get<Elf64_Sym>(symi).st_name; if (stri < symbolStringTableSize) { symname = (char*)buf() + symbolStringTableOffset + stri; } } } return symname; } // split ELF file into container classes int CELF::split() { uint32_t sc; // Section index uint32_t type; // Section type if (dataSize() == 0) return 0; parseFile(); // Parse file, get section headers, check integrity CDynamicArray<ElfFwcShdr> newSectionHeaders; // Remake list of section headers newSectionHeaders.setSize(nSections*(uint32_t)sizeof(ElfFwcShdr)); // Reserve space but leave getNumEntries() zero CDynamicArray<uint32_t> sectionIndexTrans; // Translate old section indices to new indices sectionIndexTrans.setNum(nSections + 2); // Make program headers list uint32_t nProgramHeaders = fileHeader.e_phnum; uint32_t programHeaderSize = fileHeader.e_phentsize; if (nProgramHeaders && programHeaderSize <= 0) err.submit(ERR_ELF_RECORD_SIZE); uint32_t programHeaderOffset = (uint32_t)fileHeader.e_phoff; ElfFwcPhdr pHeader; for (uint32_t i = 0; i < nProgramHeaders; i++) { pHeader = get<ElfFwcPhdr>(programHeaderOffset + i * programHeaderSize); if (pHeader.p_filesz > 0 && (uint32_t)pHeader.p_offset < dataSize()) { uint32_t phOffset = dataBuffer.push(buf() + (uint32_t)pHeader.p_offset, (uint32_t)pHeader.p_filesz); pHeader.p_offset = phOffset; // New offset refers to dataBuffer } programHeaders.push(pHeader); // Save in programHeaders list } // Make section list // Make dummy empty section ElfFwcShdr sheader2; zeroAllMembers(sheader2); newSectionHeaders.push(sheader2); for (sc = 0; sc < nSections; sc++) { // Copy section header sheader2 = sectionHeaders[sc]; // sectionHeaders[] was filled by ParseFile() type = sheader2.sh_type; // Section type if (type == SHT_NULL /* && sc == 0 */) continue; // skip first/all empty section headers // Skip symbol, relocation, and string tables. They are converted to containers: if (type == SHT_SYMTAB || type == SHT_STRTAB || type == SHT_RELA) continue; // Get section name uint32_t namei = sheader2.sh_name; if (namei >= secStringTableLen) { err.submit(ERR_ELF_STRING_TABLE); return ERR_ELF_STRING_TABLE; } const char * Name = secStringTableLen ? secStringTable + namei : "???"; // Copy name to sectionNameBuffer uint32_t nameo = stringBuffer.pushString(Name); sheader2.sh_name = nameo; // New name index refers to sectionNameBuffer // Get section data int8_t * sectionData = buf() + sheader2.sh_offset; uint32_t InitSize = (sheader2.sh_type == SHT_NOBITS) ? 0 : (uint32_t)sheader2.sh_size; if (InitSize) { // Copy data to dataBuffer uint32_t newOffset = dataBuffer.push(sectionData, InitSize); sheader2.sh_offset = newOffset; // New offset refers to dataBuffer } else { sheader2.sh_offset = dataBuffer.dataSize(); } // Save modified header and new index sectionIndexTrans[sc] = newSectionHeaders.numEntries(); newSectionHeaders.push(sheader2); } // Make symbol list // Allocate array for translating symbol indices for multiple symbol tables // in source file to a single symbol table in the symbols container CDynamicArray<uint32_t> SymbolTableOffset; // Offset of new symbol table indices relative to old indices SymbolTableOffset.setNum(nSections + 1); uint32_t NumSymbols = 0; for (sc = 0; sc < nSections; sc++) { ElfFwcShdr & sheader = sectionHeaders[sc]; uint32_t entrysize = (uint32_t)(sheader.sh_entsize); if (sheader.sh_type == SHT_SYMTAB) { // This is a symbol table // Offset for symbols in this symbol table = number of preceding symbols from other symbol tables // Symbol number in joined table = symi1 + number of symbols in preceding tables SymbolTableOffset[sc] = NumSymbols; // Find associated string table if (sheader.sh_link >= nSections) { err.submit(ERR_ELF_INDEX_RANGE); sheader.sh_link = 0; } uint32_t strtabOffset = (uint32_t)sectionHeaders[sheader.sh_link].sh_offset; if (sectionHeaders[sheader.sh_link].sh_offset >= dataSize()) err.submit(ERR_ELF_INDEX_RANGE); // Find symbol table uint32_t symtabsize = (uint32_t)(sheader.sh_size); int8_t * symtab = buf() + uint32_t(sheader.sh_offset); int8_t * symtabend = symtab + symtabsize; if (entrysize < (uint32_t)sizeof(Elf64_Sym)) { err.submit(ERR_ELF_RECORD_SIZE); entrysize = (uint32_t)sizeof(ElfFwcSym); } // Loop through symbol table uint32_t symi1; // Symbol number in this table ElfFwcSym sym; // copy of symbol table entry for (symi1 = 0; symtab < symtabend; symtab += entrysize, symi1++) { // Copy or convert symbol table entry if (fileHeader.e_machine == EM_FORWARDCOM) { sym = *(ElfFwcSym*)symtab; } else { // Translate x64 type symbol table entry Elf64_Sym sym64 = *(Elf64_Sym*)symtab; sym.st_name = sym64.st_name; sym.st_type = sym64.st_type; sym.st_bind = sym64.st_bind; sym.st_other = sym64.st_other; sym.st_section = sym64.st_section; sym.st_value = sym64.st_value; sym.st_unitsize = (uint32_t)sym64.st_size; sym.st_unitnum = 1; sym.st_reguse1 = sym.st_reguse2 = 0; } // if (sym.st_type == STT_NOTYPE && symi1 == 0) continue; // Include empty symbols to avoid changing indexes // Translate section index in symbol record if (sym.st_section < sectionIndexTrans.numEntries()) { sym.st_section = sectionIndexTrans[sym.st_section]; } // Get name if (sym.st_name) { if ((uint64_t)strtabOffset + sym.st_name > dataSize()) err.submit(ERR_ELF_INDEX_RANGE); else { const char * symName = (char*)buf() + strtabOffset + sym.st_name; sym.st_name = stringBuffer.pushString(symName); } } // Put name in symbolNameBuffer and update string index symbols.push(sym); // Count symbols NumSymbols++; } } } // Make relocation list union { Elf64_Rela a; ElfFwcReloc r2; } rel; // Loop through sections for (sc = 0; sc < nSections; sc++) { // Get section header ElfFwcShdr & sheader = sectionHeaders[sc]; if (sheader.sh_type == SHT_RELA) { // Relocations section int8_t * reltab = buf() + uint32_t(sheader.sh_offset); int8_t * reltabend = reltab + uint32_t(sheader.sh_size); int entrysize = (uint32_t)(sheader.sh_entsize); //int expectedentrysize = sheader.sh_type == SHT_RELA ? sizeof(Elf64_Rela) : 16; // Elf64_Rela : Elf64_Rel int expectedentrysize = sizeof(Elf64_Rela); if (entrysize < expectedentrysize) { err.submit(ERR_ELF_RECORD_SIZE); entrysize = expectedentrysize; } int32_t symbolSection = (int32_t)sheader.sh_link; // Symbol section, old index if (symbolSection <= 0 || (uint32_t)symbolSection >= nSections) { err.submit(ERR_ELF_SYMTAB_MISSING); return ERR_ELF_SYMTAB_MISSING; } // Symbol offset is zero if there is only one symbol section, which is the normal case uint32_t symbolOffset = SymbolTableOffset[symbolSection]; // Loop through entries for (; reltab < reltabend; reltab += entrysize) { // Copy or translate relocation table entry if (fileHeader.e_machine == EM_X86_64) { // Translate relocation type rel.a = *(Elf64_Rela*)reltab; //if (sheader.sh_type == SHT_REL) rel.a.r_addend = 0; switch (rel.a.r_type) { case R_X86_64_64: // Direct 64 bit rel.a.r_type = R_FORW_ABS | R_FORW_64; break; case R_X86_64_PC32: // Self relative 32 bit signed (not RIP relative in the sense used in COFF files) rel.a.r_type = R_FORW_SELFREL | R_FORW_32; break; case R_X86_64_32: // Direct 32 bit zero extended case R_X86_64_32S: // Direct 32 bit sign extended rel.a.r_type = R_FORW_ABS | R_FORW_32; break; } rel.r2.r_refsym = 0; rel.r2.r_section = sheader.sh_module; // sh_module = sh_info in x86 } else { rel.r2 = *(ElfFwcReloc*)reltab; } // Target symbol rel.r2.r_sym += symbolOffset; if (rel.r2.r_refsym) rel.r2.r_refsym += symbolOffset; // Save relocation relocations.push(rel.r2); } } } // Replace old section header list by new one sectionHeaders << newSectionHeaders; nSections = sectionHeaders.numEntries(); return 0; } // Join containers into ELF file int CELF::join(ElfFwcEhdr * header) { uint32_t sc; // Section index uint64_t os; // Offset of data in file uint32_t size; // Size of section data uint32_t shtype; // Section header type uint32_t ph; // Program header index const char * name; // Name of a symbol uint32_t progheadi = 0; // program header index uint32_t pHfistSection = 0; // first section covered by current program header uint32_t pHnumSections = 0; // number of sections covered by current program header bool hasProgHead = false; // current section is covered by a program header CDynamicArray<ElfFwcShdr> newSectionHeaders;// Modify list of section headers CDynamicArray<uint32_t> sectionIndexTrans; // Translate old section indices to new indices CMemoryBuffer newStrtab; // Temporary symbol string table CMemoryBuffer newShStrtab; // Temporary section string table nSections = sectionHeaders.numEntries(); // Number of sections if (nSections == 0) return 0; newSectionHeaders.setSize(nSections*sizeof(ElfFwcShdr)); // Allocate space for section headers, but don't set number sectionIndexTrans.setNum(nSections + 1); // Indices are initialized to zero // Clear any previous file setSize(0); // Make file header ElfFwcEhdr fileheader; if (header) fileheader = *header; else zeroAllMembers(fileheader); uint8_t * eident = fileheader.e_ident; *(uint32_t*)eident = ELFMAG; // Put file type magic number in fileheader.e_ident[EI_CLASS] = ELFCLASS64; // file class fileheader.e_ident[EI_DATA] = ELFDATA2LSB; // 2's complement, little endian fileheader.e_ident[EI_VERSION] = EV_CURRENT; // current ELF version fileheader.e_ident[EI_OSABI] = ELFOSABI_FORWARDCOM; // ForwardCom ABI fileheader.e_ident[EI_ABIVERSION] = EI_ABIVERSION_FORWARDCOM; // ForwardCom ABI version if (fileheader.e_type == 0) fileheader.e_type = ET_REL; // File type: object or executable fileheader.e_machine = EM_FORWARDCOM; // Machine type: ForwardCom fileheader.e_ehsize = sizeof(fileheader); push(&fileheader, sizeof(fileheader)); // Insert file header into new file // Prepare string tables to be put in last ElfFwcShdr strtabHeader; zeroAllMembers(strtabHeader); strtabHeader.sh_type = SHT_STRTAB; strtabHeader.sh_align = 0; strtabHeader.sh_entsize = 1; ElfFwcShdr shstrtabHeader = strtabHeader; newStrtab.pushString(""); // Dummy empty string at start to avoid zero offset newShStrtab.pushString(""); if (fileheader.e_type == ET_EXEC) { // Executable file. Insert program headers uint32_t ph; // Program header index fileheader.e_phoff = dataSize(); fileheader.e_phentsize = (uint16_t)sizeof(ElfFwcPhdr); fileheader.e_phnum = programHeaders.numEntries(); for (ph = 0; ph < programHeaders.numEntries(); ph++) { push(&programHeaders[ph], sizeof(ElfFwcPhdr)); } // Insert program header data only if they are not the same as section data for (ph = 0; ph < programHeaders.numEntries(); ph++) { if ((programHeaders[ph].p_type == PT_INTERP || programHeaders[ph].p_type == PT_NOTE) && programHeaders[ph].p_filesz) { os = push(dataBuffer.buf() + programHeaders[ph].p_offset, (uint32_t)programHeaders[ph].p_filesz); get<ElfFwcPhdr>(uint32_t(fileheader.e_phoff + ph * sizeof(ElfFwcPhdr))).p_offset = os; } } // translate dataBuffer offset to file offset os = dataSize(); os = (os + (1<<FILE_DATA_ALIGN)-1) & -(1<<FILE_DATA_ALIGN); // align for (ph = 0; ph < programHeaders.numEntries(); ph++) { if (programHeaders[ph].p_filesz) { //programHeaders[ph].p_offset += dataSize(); get<ElfFwcPhdr>(uint32_t(fileheader.e_phoff + ph * sizeof(ElfFwcPhdr))).p_offset = os; os += (uint32_t)programHeaders[ph].p_filesz; } } // sections covered by first program header progheadi = 0; pHfistSection = pHnumSections = 0; if (programHeaders.numEntries()) { pHfistSection = (uint32_t)programHeaders[progheadi].p_paddr; pHnumSections = (uint32_t)(programHeaders[progheadi].p_paddr >> 32); } } // Put section data into file for (sc = 0; sc < sectionHeaders.numEntries(); sc++) { ElfFwcShdr sectionHeader = sectionHeaders[sc]; // Copy section header shtype = sectionHeader.sh_type; // Section type // Skip sections with no data // Skip relocation sections, they are reconstructed later. // Skip string tables, they are reconstructed later. if (shtype == SHT_NULL || shtype == SHT_RELA || shtype == SHT_STRTAB) { continue; } else if (shtype != SHT_NOBITS && sectionHeader.sh_size != 0) { // Section contains data if (fileheader.e_type == ET_EXEC) { // find correcponding program header, if any while (sc >= pHfistSection + pHnumSections && progheadi+1 < programHeaders.numEntries()) { progheadi++; pHfistSection = (uint32_t)programHeaders[progheadi].p_paddr; pHnumSections = (uint32_t)(programHeaders[progheadi].p_paddr >> 32); } // is this section covered by a program header? hasProgHead = sc >= pHfistSection && sc < pHfistSection + pHnumSections; } if (hasProgHead) { // check if there is filler space between this section and any previous // section under the same program header uint64_t lastSecEnd = 0; if (sc > pHfistSection && sectionHeaders[sc-1].sh_type != SHT_NOBITS) { // end of previous section in dataBuffer: lastSecEnd = sectionHeaders[sc-1].sh_offset + sectionHeaders[sc-1].sh_size; if (sectionHeader.sh_offset > lastSecEnd) { // number of bytes to insert as filler uint64_t fill = sectionHeader.sh_offset - lastSecEnd; if (fill > MAX_ALIGN) err.submit(ERR_LINK_OVERFLOW, "","",""); // should not occur uint64_t fillValue = 0; if (sectionHeader.sh_flags & SHF_EXEC) { // use filler instruction fillValue = fillerInstruction | ((uint64_t)fillerInstruction << 32); } while (fill >= 8) { // loop to insert fillers push(&fillValue, 8); fill -= 8; } if (fill) push(&fillValue, (uint32_t)fill); } } } // error check os = sectionHeader.sh_offset; size = (uint32_t)sectionHeader.sh_size; if (os + size > dataBuffer.dataSize()) { err.submit(ERR_ELF_INDEX_RANGE); return ERR_ELF_INDEX_RANGE; } // Put raw data into file and save the new offset align(1<<FILE_DATA_ALIGN); // align file data os = push(dataBuffer.buf() + os, size); sectionHeader.sh_offset = os; } else { sectionHeader.sh_offset = dataSize(); } // Get section name if (sectionHeader.sh_name >= stringBuffer.dataSize()) { err.submit(ERR_ELF_INDEX_RANGE); sectionHeader.sh_name = 0; } else { const char * name = (char*)stringBuffer.buf() + sectionHeader.sh_name; if (*name) { sectionHeader.sh_name = newShStrtab.pushString(name); } } // Save modified header and index //sectionIndexTrans[sc] = newSectionHeaders.numEntries() + 1; sectionIndexTrans[sc] = newSectionHeaders.numEntries(); newSectionHeaders.push(sectionHeader); } // Number of sections with program code and data: uint32_t numDataSections = newSectionHeaders.numEntries(); // put module names and library names into shstrtab for relinkable sections updateModuleNames(newSectionHeaders, newShStrtab); // Update program segments that cover the same data as sections for (ph = 0; ph < programHeaders.numEntries(); ph++) { // reference to program header in binary file ElfFwcPhdr & pHeader = get<ElfFwcPhdr>(uint32_t(fileheader.e_phoff + ph*sizeof(ElfFwcPhdr))); // sections covered by this program header uint32_t fistSection = (uint32_t)programHeaders[ph].p_paddr; uint32_t numSections = (uint32_t)(programHeaders[ph].p_paddr >> 32); uint32_t lastSection = fistSection + numSections - 1; // update file offset if (fistSection < sectionIndexTrans.numEntries()) { uint32_t sc1 = sectionIndexTrans[fistSection]; if (sc1 < newSectionHeaders.numEntries()) { os = newSectionHeaders[sc1].sh_offset; pHeader.p_offset = os; } if (lastSection < sectionIndexTrans.numEntries()) { uint32_t sc2 = sectionIndexTrans[lastSection]; if (sc2 < newSectionHeaders.numEntries()) { // update segment size (it may have been increased by alignment fillers) os = newSectionHeaders[sc2].sh_offset; if (newSectionHeaders[sc2].sh_type != SHT_NOBITS) { os += newSectionHeaders[sc2].sh_size; } pHeader.p_filesz = os - pHeader.p_offset; //!! set p_memsz } } } } uint32_t numRelocationSections = 1; // ForwardCom needs only one relocation section // Now we know how many headers the new file will contain. Assign indexes: // one empty header at start // numDataSections: code and data // one section: symbols // numRelocationSections sections with relocations // one symbol names strtab // one section names shstrtab uint32_t symbolSection = numDataSections + 1; uint32_t firstRelSection = symbolSection + 1; uint32_t shstrtabSection = firstRelSection + numRelocationSections; uint32_t strtabSection = shstrtabSection + 1; uint32_t numSections = strtabSection + 1; // Insert symbol table and make temporary string table align(1 << FILE_DATA_ALIGN); ElfFwcShdr symtabHeader; zeroAllMembers(symtabHeader); symtabHeader.sh_type = SHT_SYMTAB; symtabHeader.sh_link = strtabSection; symtabHeader.sh_entsize = sizeof(ElfFwcSym); symtabHeader.sh_align = 3; symtabHeader.sh_offset = dataSize(); // Loop through symbol table for (uint32_t sym = 0; sym < symbols.numEntries(); sym++) { ElfFwcSym ss = symbols[sym]; uint32_t nameOffset = ss.st_name; ss.st_name = 0; if (nameOffset >= stringBuffer.dataSize()) { err.submit(ERR_INDEX_OUT_OF_RANGE); } else { name = (char*)stringBuffer.buf() + nameOffset; if (*name) { // Put name string into file and save new offset ss.st_name = newStrtab.pushString(name); } } push(&ss, sizeof(ElfFwcSym)); } // Calculate size of symtab symtabHeader.sh_size = dataSize() - symtabHeader.sh_offset; symtabHeader.sh_name = newShStrtab.pushString("symtab"); // Assign name // Insert relocation table ElfFwcShdr relocationHeader; zeroAllMembers(relocationHeader); relocationHeader.sh_type = SHT_RELA; relocationHeader.sh_flags = SHF_INFO_LINK; relocationHeader.sh_entsize = sizeof(ElfFwcReloc); relocationHeader.sh_module = 0; relocationHeader.sh_link = symbolSection; // Symbol table index relocationHeader.sh_name = newShStrtab.pushString("relocations"); // Save name relocationHeader.sh_offset = dataSize(); // Save offset // insert all relocations push(relocations.buf(), relocations.dataSize()); // Calculate size of this relocation section relocationHeader.sh_size = dataSize() - relocationHeader.sh_offset; // Make string tables shstrtabHeader.sh_name = newShStrtab.pushString("shstrtab"); strtabHeader.sh_name = newShStrtab.pushString("strtab"); shstrtabHeader.sh_offset = dataSize(); push(newShStrtab.buf(), newShStrtab.dataSize()); shstrtabHeader.sh_size = dataSize() - shstrtabHeader.sh_offset; strtabHeader.sh_offset = dataSize(); push(newStrtab.buf(), newStrtab.dataSize()); strtabHeader.sh_size = dataSize() - strtabHeader.sh_offset; // Insert section headers align(1 << FILE_DATA_ALIGN); fileheader.e_shoff = dataSize(); fileheader.e_shentsize = sizeof(ElfFwcShdr); fileheader.e_shstrndx = shstrtabSection; ElfFwcShdr nullhdr; // First section header must be empty zeroAllMembers(nullhdr); push(&nullhdr, sizeof(ElfFwcShdr)); push(newSectionHeaders.buf(), newSectionHeaders.numEntries() * sizeof(ElfFwcShdr)); push(&symtabHeader, sizeof(ElfFwcShdr)); push(&relocationHeader, sizeof(ElfFwcShdr)); push(&shstrtabHeader, sizeof(ElfFwcShdr)); push(&strtabHeader, sizeof(ElfFwcShdr)); // Update file header fileheader.e_shnum = numSections; get<ElfFwcEhdr>(0) = fileheader; return 0; } // Add section header and section data uint32_t CELF::addSection(ElfFwcShdr & section, CMemoryBuffer const & strings, CMemoryBuffer const & data) { ElfFwcShdr section2 = section; // copy section header int nul = 0; section2.sh_name = stringBuffer.pushString((const char*)strings.buf() + section.sh_name); // copy string if (dataBuffer.dataSize() == 0) dataBuffer.push(&nul, 4); // add a zero to avoid offset beginning at zero dataBuffer.align(1 << FILE_DATA_ALIGN); // align in source file if (section.sh_type != SHT_NOBITS) { section2.sh_offset = dataBuffer.push(data.buf() + section.sh_offset, (uint32_t)section.sh_size); // copy data } else { section2.sh_offset = dataBuffer.dataSize() + section.sh_offset; // BSS section } if (sectionHeaders.dataSize() == 0) { // make empty section 0 ElfFwcShdr section0; zeroAllMembers(section0); sectionHeaders.push(section0); } sectionHeaders.push(section2); // save section header nSections = sectionHeaders.numEntries(); return nSections - 1; // return section number } // Extend previously added section void CELF::extendSection(ElfFwcShdr & section, CMemoryBuffer const & data) { if (sectionHeaders.numEntries() == 0) { err.submit(ERR_LINK_OVERFLOW, "","",""); return; } uint32_t pre = sectionHeaders.numEntries() - 1; // previously added section dataBuffer.align(1 << FILE_DATA_ALIGN); // align in source file // insert new data if (section.sh_type != SHT_NOBITS) { dataBuffer.push(data.buf() + section.sh_offset, (uint32_t)section.sh_size); sectionHeaders[pre].sh_size = dataBuffer.dataSize() - sectionHeaders[pre].sh_offset; } else { // adjust header sectionHeaders[pre].sh_size += section.sh_size; } } // Insert alignment fillers between sections void CELF::insertFiller(uint64_t numBytes) { if (sectionHeaders.numEntries() == 0) { err.submit(ERR_LINK_OVERFLOW, "","",""); return; } uint32_t pre = sectionHeaders.numEntries() - 1; // previously added section uint64_t fillValue = 0; if (sectionHeaders[pre].sh_flags & SHF_EXEC) { // use filler instruction fillValue = fillerInstruction | ((uint64_t)fillerInstruction << 32); } uint64_t f = numBytes; // loop counter while (f >= 8) { // loop to insert fillers dataBuffer.push(&fillValue, 8); f -= 8; } if (f) dataBuffer.push(&fillValue, (uint32_t)f); } // Add module name and library name to relinkable sections void CELF::addModuleNames(CDynamicArray<uint32_t> &moduleNames1, CDynamicArray<uint32_t> &libraryNames1) { // moduleNames and libraryNames contain indexes into cmd.fileNameBuffer moduleNames << moduleNames1; libraryNames << libraryNames1; } // Put module names and library names into section string table for relinkable sections void CELF::updateModuleNames(CDynamicArray<ElfFwcShdr> &newSectionHeaders, CMemoryBuffer &newShStrtab) { uint32_t sec; // section number uint32_t mod; // module number uint32_t lib; // library number const char * name; // module or library name CDynamicArray<uint32_t> moduleNames2; // module names as index into stringBuffer CDynamicArray<uint32_t> libraryNames2; // library names as index into stringBuffer moduleNames2.setNum(moduleNames.numEntries()); libraryNames2.setNum(libraryNames.numEntries()); // avoid storing same name multiple times by first checking which names are needed for (sec = 1; sec < newSectionHeaders.numEntries(); sec++) { if ((newSectionHeaders[sec].sh_flags & SHF_RELINK) | cmd.debugOptions) { mod = newSectionHeaders[sec].sh_module; if (mod < moduleNames.numEntries() && moduleNames[mod]) moduleNames2[mod] = 1; lib = newSectionHeaders[sec].sh_library; if (lib && lib < libraryNames.numEntries()) libraryNames2[lib] = 1; } } // store needed names in shstrtab for (mod = 0; mod < moduleNames.numEntries(); mod++) { if (moduleNames2[mod]) { name = cmd.getFilename(moduleNames[mod]); moduleNames2[mod] = newShStrtab.pushString(name); } } for (lib = 0; lib < libraryNames.numEntries(); lib++) { if (libraryNames2[lib]) { name = cmd.getFilename(libraryNames[lib]); libraryNames2[lib] = newShStrtab.pushString(name); } } // insert updated name indexes for (sec = 1; sec < newSectionHeaders.numEntries(); sec++) { if ((newSectionHeaders[sec].sh_flags & SHF_RELINK) | cmd.debugOptions) { mod = newSectionHeaders[sec].sh_module; if (mod < moduleNames2.numEntries() && moduleNames2[mod]) { newSectionHeaders[sec].sh_module = moduleNames2[mod]; } lib = newSectionHeaders[sec].sh_library; if (lib && lib < libraryNames2.numEntries()) { newSectionHeaders[sec].sh_library = libraryNames2[lib]; } } else { newSectionHeaders[sec].sh_module = 0; newSectionHeaders[sec].sh_library = 0; } } } // Add program header void CELF::addProgHeader(ElfFwcPhdr & header) { programHeaders.push(header); } // Add a symbol uint32_t CELF::addSymbol(ElfFwcSym & symbol, CMemoryBuffer const & strings) { ElfFwcSym symbol2 = symbol; // copy symbol if (symbol2.st_unitnum == 0) symbol2.st_unitnum = 1; if (stringBuffer.numEntries() == 0) stringBuffer.pushString(""); // put empty string at position zero to avoid zero index symbol2.st_name = stringBuffer.pushString((const char*)strings.buf() + symbol.st_name); // copy name symbols.push(symbol2); // save symbol record return symbols.numEntries() - 1; // return new symbol index } // Add a relocation void CELF::addRelocation(ElfFwcReloc & relocation) { relocations.push(relocation); } // structure used by removePrivateSymbols() struct SSymbolCleanup { uint32_t preserve; // symbol must be preserved in output file uint32_t newIndex; // new index of symbol after local symbols have been removed }; // remove local symbols and adjust relocation records with new symbol indexes void CELF::removePrivateSymbols(int debugOptions) { CDynamicArray<SSymbolCleanup> symbolTranslate; // list for translating symbol indexes symbolTranslate.setNum(symbols.numEntries()); uint32_t symi; // symbol index uint32_t reli; // relocation index // loop through symbols for (symi = 1; symi < symbols.numEntries(); symi++) { if (symbols[symi].st_bind != STB_LOCAL // skip local symbols && symbols[symi].st_section // skip external symbols && !(symbols[symi].st_other & STV_HIDDEN)) { // skip hidden symbols symbolTranslate[symi].preserve = 1; // mark public symbols } if (debugOptions > 0 && symbols[symi].st_section) {// preserve local symbol names if debugOptions // (external unreferenced symbols are still discarded to avoid linking unused library functions) symbolTranslate[symi].preserve = 1; } } // loop through relocations. preserve any symbols that relocations refer to for (reli = 0; reli < relocations.numEntries(); reli++) { symi = relocations[reli].r_sym; if (symi) { symbolTranslate[symi].preserve = 1; } symi = relocations[reli].r_refsym; if (symi) { symbolTranslate[symi].preserve = 1; } } // make new symbol list CDynamicArray<ElfFwcSym> symbols2; symbols2.setNum(1); // make first symbol empty for (symi = 1; symi < symbols.numEntries(); symi++) { if (symbolTranslate[symi].preserve) { symbolTranslate[symi].newIndex = symbols2.push(symbols[symi]); } } // update relocations with new symbol indexes for (reli = 0; reli < relocations.numEntries(); reli++) { if (relocations[reli].r_sym) { relocations[reli].r_sym = symbolTranslate[relocations[reli].r_sym].newIndex; } if (relocations[reli].r_refsym) { relocations[reli].r_refsym = symbolTranslate[relocations[reli].r_refsym].newIndex; } } // replace symbol table symbols << symbols2; } // make hexadecimal code file CFileBuffer & CELF::makeHexBuffer() { CFileBuffer hexbuf; // temporary output buffer CMemoryBuffer databuffer; // temporary buffer with binary data char string[64]; // temporary text string // Write date and time. time_t time1 = time(0); char * timestring = ctime(&time1); if (timestring) { for (char *c = timestring; *c; c++) { // Remove terminating '\n' in timestring if (*c < ' ') *c = 0; } } sprintf(string, "// Hexfile %s, date %s\n", cmd.getFilename(cmd.inputFile), timestring); hexbuf.push(string, (uint32_t)strlen(string)); uint32_t wordsPerLine = cmd.maxLines; // number of 32-bit words per line in hex file int32_t bytesPerLine = wordsPerLine * 4; // number of bytes per line in hex file // Find program headers ElfFwcEhdr fileHeader = get<ElfFwcEhdr>(0); uint32_t nProgramHeaders = fileHeader.e_phnum; uint32_t programHeaderSize = fileHeader.e_phentsize; uint32_t programHeaderOffset = (uint32_t)fileHeader.e_phoff; ElfFwcPhdr pHeader; for (uint32_t ph = 0; ph < nProgramHeaders; ph++) { // loop through program headers pHeader = get<ElfFwcPhdr>(programHeaderOffset + ph * programHeaderSize); // program header uint32_t sectionSize = uint32_t(pHeader.p_filesz); // size in file uint32_t sectionMemSize = uint32_t(pHeader.p_memsz); // size in memory // write comment sprintf(string, "// Section %i, size %i\n// %i words per line\n", ph, sectionMemSize, wordsPerLine); hexbuf.push(string, (uint32_t)strlen(string)); // get data from section uint32_t os = uint32_t(pHeader.p_offset); // file offset // round up size to multiple of bytesPerLine sectionMemSize = (sectionMemSize + bytesPerLine - 1) & -bytesPerLine; // copy section data to databuffer databuffer.clear(); databuffer.push(buf() + os, sectionMemSize); databuffer.setDataSize(sectionMemSize); // line loop for (uint32_t L = 0; L < sectionSize; L += bytesPerLine) { // word loop backwords for big endian order for (int32_t W = wordsPerLine-1; W >= 0; W--) { uint32_t data = databuffer.get<uint32_t>(L + W * 4); sprintf(string, "%08X", data); hexbuf.push(string, (uint32_t)strlen(string)); } hexbuf.push("\n", 1); // end of line } } hexbuf >> *this; // replace parent buffer (ELF file is lost) return *this; } // Write a link map void CELF::makeLinkMap(FILE * stream) { // Find program headers //fprintf(stream, "\n\nLink map:"); uint32_t nProgramHeaders = fileHeader.e_phnum; uint32_t programHeaderSize = fileHeader.e_phentsize; if (nProgramHeaders && programHeaderSize <= 0) err.submit(ERR_ELF_RECORD_SIZE); uint32_t programHeaderOffset = (uint32_t)fileHeader.e_phoff; ElfFwcPhdr pHeader; // program header ElfFwcShdr sheader; // section header const char * basename = ""; // name of base pointer const char * secname = ""; // name of section const char * modname = ""; // name of module uint64_t codesize = 0; // size of code and const data uint64_t datasize = 0; // max distance of data from datap // print table header fprintf(stream, "\n%-9s %-20s %-20s %-10s %-10s %-8s %s", "base", "section", "module", "start", "size", "align", "attributes"); for (uint32_t i = 0; i < nProgramHeaders; i++) { pHeader = get<ElfFwcPhdr>(programHeaderOffset); if (pHeader.p_type & PT_LOAD) { // get base pointer switch (pHeader.p_flags & SHF_BASEPOINTER) { case SHF_IP: basename = "ip"; break; case SHF_DATAP: basename = "datap"; break; case SHF_THREADP: basename = "threadp"; break; default: basename = "?"; break; } // get name of first section secname = ""; uint32_t sc = (uint32_t)pHeader.p_paddr; if (sc < nSections) { sheader = sectionHeaders[sc]; if (sheader.sh_flags == pHeader.p_flags && sheader.sh_name < secStringTableLen) { secname = secStringTable + sheader.sh_name; } } // loop through sections under this program header for (; sc < nSections; sc++) { sheader = sectionHeaders[sc]; if (sheader.sh_flags != pHeader.p_flags) break; // stop when section does not belong to this program header // section name if (sheader.sh_name < secStringTableLen) secname = secStringTable + sheader.sh_name; else secname = ""; // module name if (sheader.sh_module < secStringTableLen) modname = secStringTable + sheader.sh_module; else modname = ""; // write line for section header fprintf(stream, "\n%-9s %-20s %-20s 0x%-8X 0x%-8X 0x%-6X ", basename, secname, modname, (uint32_t)sheader.sh_addr, (uint32_t)sheader.sh_size, 1 << sheader.sh_align); if (pHeader.p_flags & SHF_READ) fprintf(stream, "read "); if (pHeader.p_flags & SHF_WRITE) fprintf(stream, "write "); if (pHeader.p_flags & SHF_EXEC) fprintf(stream, "execute "); if (sheader.sh_type == SHT_NOBITS) fprintf(stream, "uninititalized"); } // write total fprintf(stream, "\n%-9s %-20s %-20s 0x%-8X 0x%-8X 0x%-6X ", basename, "total:", "", (uint32_t)pHeader.p_vaddr, (uint32_t)pHeader.p_memsz, 1 << pHeader.p_align); if (pHeader.p_flags & SHF_READ) fprintf(stream, "read "); if (pHeader.p_flags & SHF_WRITE) fprintf(stream, "write "); if (pHeader.p_flags & SHF_EXEC) fprintf(stream, "execute "); fprintf(stream, "\n"); // find required codesize and datasize if (pHeader.p_flags & SHF_IP) { uint64_t s = pHeader.p_vaddr + pHeader.p_memsz; if (s > codesize) codesize = s; } else if (pHeader.p_flags & SHF_DATAP) { int64_t t = fileHeader.e_datap_base - pHeader.p_vaddr; if (t > (int64_t)datasize) datasize = t; int64_t u = pHeader.p_vaddr + pHeader.p_memsz - fileHeader.e_datap_base; if (u > (int64_t)datasize) datasize = u; } else if (pHeader.p_flags & SHF_THREADP) { int64_t t = fileHeader.e_threadp_base - pHeader.p_vaddr; if (t > (int64_t)datasize) datasize = t; int64_t u = pHeader.p_vaddr + pHeader.p_memsz - fileHeader.e_threadp_base; if (u > (int64_t)datasize) datasize = u; } } programHeaderOffset += programHeaderSize; } fprintf(stream, "\nip_base: 0x%X, datap_base: 0x%X, threadp_base: 0x%X, entry_point: 0x%X", (uint32_t)fileHeader.e_ip_base, (uint32_t)fileHeader.e_datap_base, (uint32_t)fileHeader.e_threadp_base, (uint32_t)fileHeader.e_entry); fprintf(stream, "\ncodesize: 0x%llX, datasize: 0x%llX", codesize, datasize); } // Reset everything void CELF::reset() { nSections = 0; moduleName = 0; library = 0; relinkable = false; symbols.setSize(0); sectionHeaders.setSize(0); programHeaders.setSize(0); relocations.setSize(0); stringBuffer.setSize(0); dataBuffer.setSize(0); moduleNames.setSize(0); libraryNames.setSize(0); setSize(0); }
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