diff options
Diffstat (limited to 'tools/bin2obj/bin2obj.cpp')
| -rw-r--r-- | tools/bin2obj/bin2obj.cpp | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/tools/bin2obj/bin2obj.cpp b/tools/bin2obj/bin2obj.cpp new file mode 100644 index 00000000..6963438d --- /dev/null +++ b/tools/bin2obj/bin2obj.cpp @@ -0,0 +1,295 @@ +#include <iostream>
+#include <string>
+#include <vector>
+#include <fstream>
+extern "C" {
+#include <elf.h>
+}
+
+enum Proc : unsigned char {
+ PROC_ARM = EM_ARM,
+ PROC_PPC = EM_PPC,
+};
+
+enum Endian : unsigned char {
+ END_LITTLE = ELFDATA2LSB,
+ END_BIG = ELFDATA2MSB,
+};
+
+enum Shndx {
+ SHNDX_SHSTRTAB = 1,
+ SHNDX_SYMTAB,
+ SHNDX_STRTAB,
+ SHNDX_PROGBITS,
+};
+
+static inline void usage() {
+ std::cout << "Usage: bin2obj [-b|--begin SYMBOL_BEGIN]" << std::endl;
+ std::cout << " [-e|--end SYMBOL_END]" << std::endl;
+ std::cout << " [-C|--compatible]" << std::endl;
+ std::cout << " [-a|--align ALIGNMENT]" << std::endl;
+ std::cout << " [-r|--readonly]" << std::endl;
+ std::cout << " [-s|--section SECTION]" << std::endl;
+ std::cout << " [-m|--machine [arm|ppc]]" << std::endl;
+ std::cout << " [-B|--big-endian]" << std::endl;
+ std::cout << " [-L|--little-endian] BINARY_FILE OBJECT_FILE" << std::endl;
+ std::cout << std::endl;
+ std::cout << " -b or --begin Set symbol name for top of binary. (*)" << std::endl;
+ std::cout << " -e or --end Set symbol name for bottom of binary. (*)" << std::endl;
+ std::cout << " -C or --compatible Use compatible symbols with BinToElf.exe." << std::endl;
+ std::cout << " Same as \"-b _binary_%f -e _binary_%f_end\"." << std::endl;
+ std::cout << " -a or --align Set binary data alignment in bytes." << std::endl;
+ std::cout << " -r or --readonly Handle binary data as readonly." << std::endl;
+ std::cout << " -s or --section Set section name." << std::endl;
+ std::cout << " -m or --machine [arm|ppc] Machine arch [arm|ppc].(default=arm)" << std::endl;
+ std::cout << " -B or --big-endian Output in big endian format." << std::endl;
+ std::cout << " -L or --little-endian Output in little endian format." << std::endl;
+ std::cout << std::endl;
+ std::cout << " (*) special % rules for symbols (ex. binary_file = \"filename.dat\")" << std::endl;
+ std::cout << " %f,%t replaced to file name of binary (%f = \"filename.dat\")" << std::endl;
+ std::cout << " %b replaced to base name of binary (%b = \"filename\")" << std::endl;
+ std::cout << " %e replaced to extension of binary (%e = \"dat\")" << std::endl;
+}
+
+std::string& ntrsprintf(std::string& templ, std::string binfname) {
+ size_t pos;
+ if ((pos = binfname.rfind('/')) != std::string::npos) {
+ binfname = binfname.substr(pos + 1);
+ }
+ size_t extpos = binfname.rfind('.');
+ if (extpos == std::string::npos) extpos = binfname.length() - 1;
+ if ((pos = templ.find("%f")) != std::string::npos || (pos = templ.find("%t")) != std::string::npos) {
+ templ = templ.substr(0, pos) + binfname + templ.substr(pos + 2);
+ }
+ if ((pos = templ.find("%b")) != std::string::npos) {
+ templ = templ.substr(0, pos) + binfname.substr(0, extpos) + templ.substr(pos + 2);
+ }
+ if ((pos = templ.find("%e")) != std::string::npos) {
+ templ = templ.substr(0, pos) + binfname.substr(extpos + 1) + templ.substr(pos + 2);
+ }
+ return templ;
+}
+
+int main(int argc, char** argv) {
+ std::vector<std::string> args(argv + 1, argv + argc);
+ std::vector<std::string> posargs;
+ std::string sym_begin;
+ std::string sym_end;
+ bool compatible = false;
+ int alignment = 4;
+ bool readonly = false;
+ std::string section;
+ Proc proc = PROC_ARM;
+ Endian endian = END_LITTLE;
+
+ for (auto arg_i = args.cbegin(); arg_i < args.cend(); arg_i++) {
+ const std::string cur_arg = *arg_i;
+ if (cur_arg == "-b" || cur_arg == "--begin") {
+ arg_i++;
+ sym_begin = *arg_i;
+ } else if (cur_arg == "-e" || cur_arg == "--end") {
+ arg_i++;
+ sym_end = *arg_i;
+ } else if (cur_arg == "-C" || cur_arg == "--compatible") {
+ compatible = true;
+ } else if (cur_arg == "-a" || cur_arg == "--align") {
+ arg_i++;
+ try {
+ alignment = std::stoi(*arg_i);
+ } catch (std::invalid_argument& e) {
+ if (e.what() == static_cast<std::string>("stoi")) {
+ std::cerr << "Invalid integer value for " << cur_arg << ": " << *arg_i << std::endl;
+ } else {
+ std::cerr << "Unexpected error while parsing value for " << cur_arg << ": " << e.what() << std::endl;
+ }
+ return 1;
+ }
+ } else if (cur_arg == "-r" || cur_arg == "--readonly") {
+ readonly = true;
+ } else if (cur_arg == "-s" || cur_arg == "--section") {
+ arg_i++;
+ section = *arg_i;
+ } else if (cur_arg == "-m" || cur_arg == "--machine") {
+ arg_i++;
+ if (*arg_i == "arm") {
+ proc = PROC_ARM;
+ } else if (*arg_i == "ppc") {
+ proc = PROC_PPC;
+ } else {
+ std::cerr << "Invalid argument for " << cur_arg << ": " << *arg_i << std::endl;
+ return 1;
+ }
+ } else if (cur_arg == "-B" || cur_arg == "--big-endian") {
+ endian = END_BIG;
+ } else if (cur_arg == "-L" || cur_arg == "--little-endian") {
+ endian = END_LITTLE;
+ } else {
+ posargs.push_back(cur_arg);
+ }
+ }
+
+ if (posargs.size() < 2) {
+ usage();
+ std::cerr << "Missing required position argument: " << (posargs.empty() ? "BINARY_FILE" : "OBJECT_FILE") << std::endl;
+ return 1;
+ } else if (posargs.size() > 2) {
+ usage();
+ std::cerr << "Unrecognized arguments (first one: " << posargs[2] << ")" << std::endl;
+ return 1;
+ }
+ if (compatible) {
+ sym_begin = "_binary_%f";
+ sym_end = "_binary_%f_end";
+ }
+ if (sym_begin.empty()) {
+ sym_begin = "%b_begin";
+ }
+ if (sym_end.empty()) {
+ sym_end = "%b_end";
+ }
+ sym_begin = ntrsprintf(sym_begin, posargs[0]);
+ sym_end = ntrsprintf(sym_end, posargs[0]);
+ if (section.empty()) {
+ section = readonly ? ".rodata" : ".data";
+ }
+ if (alignment == 0) {
+ alignment = 1;
+ } else {
+ int i;
+ for (i = 0; i < 10; i++) {
+ if ((alignment >> i) & 1) {
+ if ((alignment >> i) & ~1) {
+ std::cerr << "Alignment must be a power of 2" << std::endl;
+ return 1;
+ }
+ break;
+ }
+ }
+ if (i == 10) {
+ std::cerr << "Alignment exceeds maximum value of 512" << std::endl;
+ return 1;
+ }
+ }
+ if (alignment < 4) {
+ alignment = 4;
+ }
+ std::ifstream binfile(posargs[0], std::ios::binary | std::ios::ate);
+ if (!binfile.good()) {
+ std::cerr << "Unable to open file " << posargs[0] << " for reading" << std::endl;
+ return 1;
+ }
+ std::ofstream objfile(posargs[1], std::ios::binary);
+ if (!objfile.good()) {
+ binfile.close();
+ std::cerr << "Unable to open file " << posargs[1] << " for writing" << std::endl;
+ return 1;
+ }
+ size_t filesize = binfile.tellg();
+ binfile.seekg(0);
+
+ // Elf header
+ Elf32_Ehdr ehdr = {
+ .e_ident = {
+ ELFMAG0, // EI_MAG0
+ ELFMAG1, // EI_MAG1
+ ELFMAG2, // EI_MAG2
+ ELFMAG3, // EI_MAG3
+ ELFCLASS32, // EI_CLASS
+ endian, // EI_DATA
+ EV_CURRENT, // EI_VERSION
+ ELFOSABI_NONE, // EI_OSABI
+ 0, // EI_ABIVERSION
+ },
+ .e_type = ET_REL,
+ .e_machine = proc,
+ .e_version = EV_CURRENT,
+ .e_shoff = sizeof(Elf32_Ehdr),
+ .e_ehsize = sizeof(Elf32_Ehdr),
+ .e_shentsize = sizeof(Elf32_Shdr),
+ .e_shnum = 5,
+ .e_shstrndx = 1,
+ };
+
+ // Five sections: NULL, user section, symtab, strtab, shstrtab
+ Elf32_Shdr shdr[5] = {};
+
+ size_t sh_name = 1;
+ shdr[SHNDX_SHSTRTAB].sh_type = SHT_STRTAB;
+ shdr[SHNDX_SHSTRTAB].sh_offset = ehdr.e_shoff + 5 * sizeof(Elf32_Shdr);
+ shdr[SHNDX_SHSTRTAB].sh_name = sh_name;
+ sh_name += std::string(".shstrtab").length() + 1;
+ shdr[SHNDX_SYMTAB].sh_type = SHT_SYMTAB;
+ shdr[SHNDX_SYMTAB].sh_link = SHNDX_STRTAB;
+ shdr[SHNDX_SYMTAB].sh_info = 2;
+ shdr[SHNDX_SYMTAB].sh_addralign = 4;
+ shdr[SHNDX_SYMTAB].sh_name = sh_name;
+ shdr[SHNDX_SYMTAB].sh_entsize = sizeof(Elf32_Sym);
+ sh_name += std::string(".symtab").length() + 1;
+ shdr[SHNDX_STRTAB].sh_type = SHT_STRTAB;
+ shdr[SHNDX_STRTAB].sh_addralign = 1;
+ shdr[SHNDX_STRTAB].sh_name = sh_name;
+ sh_name += std::string(".strtab").length() + 1;
+ shdr[SHNDX_PROGBITS].sh_type = SHT_PROGBITS;
+ shdr[SHNDX_PROGBITS].sh_flags = SHF_ALLOC | (readonly ? 0 : SHF_WRITE);
+ shdr[SHNDX_PROGBITS].sh_addralign = alignment;
+ shdr[SHNDX_PROGBITS].sh_name = sh_name;
+ sh_name += section.length() + 1;
+ shdr[SHNDX_SHSTRTAB].sh_size = sh_name;
+ sh_name = (sh_name + 3) & ~3;
+ shdr[SHNDX_SYMTAB].sh_offset = shdr[SHNDX_SHSTRTAB].sh_offset + sh_name;
+ shdr[SHNDX_SYMTAB].sh_size = 3 * sizeof(Elf32_Sym);
+ shdr[SHNDX_STRTAB].sh_offset = shdr[SHNDX_SYMTAB].sh_offset + shdr[SHNDX_SYMTAB].sh_size;
+ size_t st_name = sym_begin.length() + sym_end.length() + 3;
+ shdr[SHNDX_STRTAB].sh_size = st_name;
+ st_name = (st_name + 3) & ~3;
+ shdr[SHNDX_PROGBITS].sh_offset = shdr[SHNDX_STRTAB].sh_offset + st_name;
+ shdr[SHNDX_PROGBITS].sh_size = filesize;
+
+ // symtab
+ Elf32_Sym syms[3] = {};
+ // begin
+ syms[1].st_info = ELF32_ST_INFO(STB_GLOBAL, STT_OBJECT);
+ syms[1].st_shndx = SHNDX_PROGBITS;
+ syms[1].st_size = filesize;
+ syms[1].st_value = 0;
+ syms[1].st_name = 1;
+ // end
+ syms[2].st_info = ELF32_ST_INFO(STB_GLOBAL, STT_OBJECT);
+ syms[2].st_shndx = SHNDX_PROGBITS;
+ syms[2].st_size = 0;
+ syms[2].st_value = filesize;
+ syms[2].st_name = sym_begin.length() + 2;
+
+ // Write to file
+ char zeroes[3] = {0, 0, 0};
+ unsigned padding;
+ // Elf header
+ objfile.write((char*)&ehdr, sizeof(ehdr));
+ // Section headers
+ objfile.write((char*)shdr, sizeof(shdr));
+ // Section string table
+ objfile.write(zeroes, 1);
+ objfile.write(".shstrtab", sizeof(".shstrtab"));
+ objfile.write(".symtab", sizeof(".symtab"));
+ objfile.write(".strtab", sizeof(".strtab"));
+ objfile.write(section.c_str(), static_cast<long>(section.length() + 1));
+ padding = (4 - (sizeof(".shstrtab") + sizeof(".symtab") + sizeof(".strtab") + section.length() + 2)) & 3;
+ objfile.write(zeroes, padding);
+ // Symbol table
+ objfile.write((char*)syms, sizeof(syms));
+ // String table
+ objfile.write(zeroes, 1);
+ objfile.write(sym_begin.c_str(), static_cast<long>(sym_begin.length() + 1));
+ objfile.write(sym_end.c_str(), static_cast<long>(sym_end.length() + 1));
+ padding = (4 - (sym_begin.length() + sym_end.length() + 3)) & 3;
+ objfile.write(zeroes, padding);
+ // Data
+ char* rdbuf = new char[filesize];
+ binfile.read(rdbuf, static_cast<long>(filesize));
+ objfile.write(rdbuf, static_cast<long>(filesize));
+ delete[] rdbuf;
+
+ binfile.close();
+ objfile.close();
+ return 0;
+}
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