1 /* $NetBSD: load_elf.cpp,v 1.19 2008/11/07 16:28:26 rafal Exp $ */ 2 3 /*- 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by UCHIYAMA Yasushi. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <hpcmenu.h> 33 #include <menu/window.h> 34 #include <menu/rootwindow.h> 35 36 #include <load.h> 37 #include <load_elf.h> 38 #include <console.h> 39 #include <memory.h> 40 #include <file.h> 41 42 #define ROUND4(x) (((x) + 3) & ~3) 43 44 ElfLoader::ElfLoader(Console *&cons, MemoryManager *&mem) 45 : Loader(cons, mem) 46 { 47 48 _sym_blk.enable = FALSE; 49 _ph = NULL; 50 _sh = NULL; 51 52 DPRINTF((TEXT("Loader: ELF\n"))); 53 } 54 55 ElfLoader::~ElfLoader(void) 56 { 57 58 if (_sym_blk.header != NULL) 59 free(_sym_blk.header); 60 if (_ph != NULL) 61 free(_ph); 62 if (_sh != NULL) 63 free(_sh); 64 } 65 66 BOOL 67 ElfLoader::setFile(File *&file) 68 { 69 size_t sz; 70 Loader::setFile(file); 71 72 // read ELF header and check it 73 if (!read_header()) 74 return FALSE; 75 76 // read section header 77 sz = _eh.e_shnum * _eh.e_shentsize; 78 if ((_sh = static_cast<Elf_Shdr *>(malloc(sz))) == NULL) { 79 DPRINTF((TEXT("can't allocate section header table.\n"))); 80 return FALSE; 81 } 82 if (_file->read(_sh, sz, _eh.e_shoff) != sz) { 83 DPRINTF((TEXT("section header read error.\n"))); 84 return FALSE; 85 } 86 87 // read program header 88 sz = _eh.e_phnum * _eh.e_phentsize; 89 if ((_ph = static_cast<Elf_Phdr *>(malloc(sz))) == NULL) { 90 DPRINTF((TEXT("can't allocate program header table.\n"))); 91 return FALSE; 92 } 93 if (_file->read(_ph, sz, _eh.e_phoff) != sz) { 94 DPRINTF((TEXT("program header read error.\n"))); 95 return FALSE; 96 } 97 98 return TRUE; 99 } 100 101 size_t 102 ElfLoader::memorySize() 103 { 104 int i; 105 Elf_Phdr *ph = _ph; 106 size_t sz = 0; 107 size_t extra = 0; 108 109 DPRINTF((TEXT("file size: "))); 110 for (i = 0; i < _eh.e_phnum; i++, ph++) { 111 if (ph->p_type == PT_LOAD) { 112 size_t filesz = ph->p_filesz; 113 DPRINTF((TEXT("%s0x%x"), 114 sz == 0 ? "" : "+", 115 filesz)); 116 sz += _mem->roundPage(filesz); 117 // compensate for partial last tag 118 extra += _mem->getTaggedPageSize(); 119 if (filesz < ph->p_memsz) 120 // compensate for zero clear 121 extra += _mem->getTaggedPageSize(); 122 123 } 124 } 125 126 // reserve for symbols 127 size_t symblk_sz = symbol_block_size(); 128 if (symblk_sz) { 129 sz += symblk_sz; 130 DPRINTF((TEXT(" = 0x%x]"), symblk_sz)); 131 // XXX: compensate for partial tags after ELF header and symtab 132 extra += 2 * _mem->getTaggedPageSize(); 133 } 134 135 sz += extra; 136 DPRINTF((TEXT("+[extra: 0x%x]"), extra)); 137 138 DPRINTF((TEXT(" = 0x%x bytes\n"), sz)); 139 return sz; 140 } 141 142 kaddr_t 143 ElfLoader::jumpAddr() 144 { 145 DPRINTF((TEXT("kernel entry address: 0x%08x\n"), _eh.e_entry)); 146 return _eh.e_entry; 147 } 148 149 BOOL 150 ElfLoader::load() 151 { 152 Elf_Phdr *ph; 153 vaddr_t kv; 154 int i; 155 156 _load_segment_start(); 157 158 for (i = 0, ph = _ph; i < _eh.e_phnum; i++, ph++) { 159 if (ph->p_type == PT_LOAD) { 160 size_t filesz = ph->p_filesz; 161 size_t memsz = ph->p_memsz; 162 kv = ph->p_paddr; 163 off_t fileofs = ph->p_offset; 164 DPRINTF((TEXT("seg[%d] paddr 0x%08x file size 0x%x mem size 0x%x\n"), 165 i, kv, filesz, memsz)); 166 _load_segment(kv, memsz, fileofs, filesz); 167 kv += ROUND4(memsz); 168 } 169 } 170 171 load_symbol_block(kv); 172 173 // tag chain still opening 174 175 return _load_success(); 176 } 177 178 // 179 // Prepare ELF headers for symbol table. 180 // 181 // ELF header 182 // section header 183 // shstrtab 184 // symtab 185 // strtab 186 // 187 size_t 188 ElfLoader::symbol_block_size() 189 { 190 size_t shstrsize = ROUND4(_sh[_eh.e_shstrndx].sh_size); 191 size_t shtab_sz = _eh.e_shentsize * _eh.e_shnum; 192 off_t shstrtab_offset = sizeof(Elf_Ehdr) + shtab_sz; 193 int i; 194 195 memset(&_sym_blk, 0, sizeof(_sym_blk)); 196 _sym_blk.enable = FALSE; 197 _sym_blk.header_size = sizeof(Elf_Ehdr) + shtab_sz + shstrsize; 198 199 // inquire string and symbol table size 200 _sym_blk.header = static_cast<char *>(malloc(_sym_blk.header_size)); 201 if (_sym_blk.header == NULL) { 202 MessageBox(HPC_MENU._root->_window, 203 TEXT("Can't determine symbol block size."), 204 TEXT("WARNING"), 205 MB_ICONWARNING | MB_OK); 206 UpdateWindow(HPC_MENU._root->_window); 207 return (0); 208 } 209 210 // set pointer for symbol block 211 Elf_Ehdr *eh = reinterpret_cast<Elf_Ehdr *>(_sym_blk.header); 212 Elf_Shdr *sh = reinterpret_cast<Elf_Shdr *> 213 (_sym_blk.header + sizeof(Elf_Ehdr)); 214 char *shstrtab = _sym_blk.header + shstrtab_offset; 215 216 // initialize headers 217 memset(_sym_blk.header, 0, _sym_blk.header_size); 218 memcpy(eh, &_eh, sizeof(Elf_Ehdr)); 219 eh->e_phoff = 0; 220 eh->e_phnum = 0; 221 eh->e_entry = 0; // XXX NetBSD kernel check this member. see machdep.c 222 eh->e_shoff = sizeof(Elf_Ehdr); 223 memcpy(sh, _sh, shtab_sz); 224 225 // inquire symbol/string table information 226 _file->read(shstrtab, shstrsize, _sh[_eh.e_shstrndx].sh_offset); 227 for (i = 0; i < _eh.e_shnum; i++, sh++) { 228 if (strcmp(".strtab", shstrtab + sh->sh_name) == 0) { 229 _sym_blk.shstr = sh; 230 _sym_blk.stroff = sh->sh_offset; 231 } else if (strcmp(".symtab", shstrtab + sh->sh_name) == 0) { 232 _sym_blk.shsym = sh; 233 _sym_blk.symoff = sh->sh_offset; 234 } 235 236 sh->sh_offset = (i == _eh.e_shstrndx) ? shstrtab_offset : 0; 237 } 238 239 if (_sym_blk.shstr == NULL || _sym_blk.shsym == NULL) { 240 if (HPC_PREFERENCE.safety_message) { 241 MessageBox(HPC_MENU._root->_window, 242 TEXT("No symbol and/or string table in binary.\n(not fatal)"), 243 TEXT("Information"), 244 MB_ICONINFORMATION | MB_OK); 245 UpdateWindow(HPC_MENU._root->_window); 246 } 247 free(_sym_blk.header); 248 _sym_blk.header = NULL; 249 250 return (0); 251 } 252 253 // set Section Headers for symbol/string table 254 _sym_blk.shsym->sh_offset = shstrtab_offset + shstrsize; 255 _sym_blk.shstr->sh_offset = shstrtab_offset + shstrsize + 256 ROUND4(_sym_blk.shsym->sh_size); 257 _sym_blk.enable = TRUE; 258 259 DPRINTF((TEXT("+[ksyms: header 0x%x, symtab 0x%x, strtab 0x%x"), 260 _sym_blk.header_size, _sym_blk.shsym->sh_size, 261 _sym_blk.shstr->sh_size)); 262 263 // return total amount of symbol block 264 return (_sym_blk.header_size + ROUND4(_sym_blk.shsym->sh_size) + 265 _sym_blk.shstr->sh_size); 266 } 267 268 void 269 ElfLoader::load_symbol_block(vaddr_t kv) 270 { 271 size_t sz; 272 273 if (!_sym_blk.enable) 274 return; 275 276 DPRINTF((TEXT("ksyms\n"))); 277 278 // load header 279 _load_memory(kv, _sym_blk.header_size, _sym_blk.header); 280 kv += _sym_blk.header_size; 281 282 // load symbol table 283 sz = _sym_blk.shsym->sh_size; 284 _load_segment(kv, sz, _sym_blk.symoff, sz); 285 kv += ROUND4(sz); 286 287 // load string table 288 sz = _sym_blk.shstr->sh_size; 289 _load_segment(kv, sz, _sym_blk.stroff, sz); 290 } 291 292 BOOL 293 ElfLoader::read_header() 294 { 295 // read ELF header 296 _file->read(&_eh, sizeof(Elf_Ehdr), 0); 297 298 // check ELF Magic. 299 if (!is_elf_file()) { 300 DPRINTF((TEXT("not a ELF file.\n"))); 301 return FALSE; 302 } 303 304 // Windows CE is 32bit little-endian only. 305 if (_eh.e_ident[EI_DATA] != ELFDATA2LSB || 306 _eh.e_ident[EI_CLASS] != ELFCLASS32) { 307 DPRINTF((TEXT("invalid class/data(%d/%d)\n"), 308 _eh.e_ident[EI_CLASS], _eh.e_ident[EI_DATA])); 309 return FALSE; 310 } 311 312 // Is native architecture? 313 switch(_eh.e_machine) { 314 ELF32_MACHDEP_ID_CASES; 315 default: 316 DPRINTF((TEXT("not a native architecture. machine = %d\n"), 317 _eh.e_machine)); 318 return FALSE; 319 } 320 321 // Check object type 322 if (_eh.e_type != ET_EXEC) { 323 DPRINTF((TEXT("not a executable file. type = %d\n"), 324 _eh.e_type)); 325 return FALSE; 326 } 327 328 if (_eh.e_phoff == 0 || _eh.e_phnum == 0 || _eh.e_phnum > 16 || 329 _eh.e_phentsize != sizeof(Elf_Phdr)) { 330 DPRINTF((TEXT("invalid program header information.\n"))); 331 return FALSE; 332 } 333 334 return TRUE; 335 } 336
Indexes created Sat Sep 20 22:09:52 GMT 2025