elf_object.cc revision 8852:c744483edfcf
17584SAli.Saidi@arm.com/* 211011SAndreas.Sandberg@ARM.com * Copyright (c) 2003-2005 The Regents of The University of Michigan 37584SAli.Saidi@arm.com * All rights reserved. 47584SAli.Saidi@arm.com * 57584SAli.Saidi@arm.com * Redistribution and use in source and binary forms, with or without 67584SAli.Saidi@arm.com * modification, are permitted provided that the following conditions are 77584SAli.Saidi@arm.com * met: redistributions of source code must retain the above copyright 87584SAli.Saidi@arm.com * notice, this list of conditions and the following disclaimer; 97584SAli.Saidi@arm.com * redistributions in binary form must reproduce the above copyright 107584SAli.Saidi@arm.com * notice, this list of conditions and the following disclaimer in the 117584SAli.Saidi@arm.com * documentation and/or other materials provided with the distribution; 127584SAli.Saidi@arm.com * neither the name of the copyright holders nor the names of its 137584SAli.Saidi@arm.com * contributors may be used to endorse or promote products derived from 147584SAli.Saidi@arm.com * this software without specific prior written permission. 157584SAli.Saidi@arm.com * 167584SAli.Saidi@arm.com * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 177584SAli.Saidi@arm.com * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 187584SAli.Saidi@arm.com * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 197584SAli.Saidi@arm.com * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 207584SAli.Saidi@arm.com * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 217584SAli.Saidi@arm.com * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 227584SAli.Saidi@arm.com * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 237584SAli.Saidi@arm.com * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 247584SAli.Saidi@arm.com * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 257584SAli.Saidi@arm.com * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 267584SAli.Saidi@arm.com * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 277584SAli.Saidi@arm.com * 287584SAli.Saidi@arm.com * Authors: Steve Reinhardt 297584SAli.Saidi@arm.com * Ali Saidi 307584SAli.Saidi@arm.com */ 317584SAli.Saidi@arm.com 327584SAli.Saidi@arm.com#include <cassert> 337584SAli.Saidi@arm.com#include <string> 347584SAli.Saidi@arm.com 357584SAli.Saidi@arm.com#include "base/loader/elf_object.hh" 367584SAli.Saidi@arm.com#include "base/loader/symtab.hh" 377584SAli.Saidi@arm.com#include "base/bitfield.hh" 387584SAli.Saidi@arm.com#include "base/misc.hh" 397584SAli.Saidi@arm.com#include "base/trace.hh" 407584SAli.Saidi@arm.com#include "debug/Loader.hh" 417584SAli.Saidi@arm.com#include "sim/byteswap.hh" 427584SAli.Saidi@arm.com#include "gelf.h" 437950SAli.Saidi@ARM.com 447584SAli.Saidi@arm.comusing namespace std; 457584SAli.Saidi@arm.com 4611011SAndreas.Sandberg@ARM.comObjectFile * 477584SAli.Saidi@arm.comElfObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data) 487584SAli.Saidi@arm.com{ 497584SAli.Saidi@arm.com Elf *elf; 507584SAli.Saidi@arm.com GElf_Ehdr ehdr; 517584SAli.Saidi@arm.com Arch arch = UnknownArch; 527584SAli.Saidi@arm.com OpSys opSys = UnknownOpSys; 537584SAli.Saidi@arm.com 5411011SAndreas.Sandberg@ARM.com // check that header matches library version 5511011SAndreas.Sandberg@ARM.com if (elf_version(EV_CURRENT) == EV_NONE) 5611011SAndreas.Sandberg@ARM.com panic("wrong elf version number!"); 5711011SAndreas.Sandberg@ARM.com 5811011SAndreas.Sandberg@ARM.com // get a pointer to elf structure 5911011SAndreas.Sandberg@ARM.com elf = elf_memory((char*)data,len); 6011011SAndreas.Sandberg@ARM.com // will only fail if fd is invalid 6111011SAndreas.Sandberg@ARM.com assert(elf != NULL); 6211011SAndreas.Sandberg@ARM.com 6311011SAndreas.Sandberg@ARM.com // Check that we actually have a elf file 6411011SAndreas.Sandberg@ARM.com if (gelf_getehdr(elf, &ehdr) ==0) { 6511011SAndreas.Sandberg@ARM.com DPRINTFR(Loader, "Not ELF\n"); 6611011SAndreas.Sandberg@ARM.com elf_end(elf); 6711011SAndreas.Sandberg@ARM.com return NULL; 6811011SAndreas.Sandberg@ARM.com } else { 6911011SAndreas.Sandberg@ARM.com //Detect the architecture 7011011SAndreas.Sandberg@ARM.com //Since we don't know how to check for alpha right now, we'll 7111011SAndreas.Sandberg@ARM.com //just assume if it wasn't something else and it's 64 bit, that's 7211011SAndreas.Sandberg@ARM.com //what it must be. 7311011SAndreas.Sandberg@ARM.com if (ehdr.e_machine == EM_SPARC64 || 7411011SAndreas.Sandberg@ARM.com (ehdr.e_machine == EM_SPARC && 7511011SAndreas.Sandberg@ARM.com ehdr.e_ident[EI_CLASS] == ELFCLASS64)|| 7611011SAndreas.Sandberg@ARM.com ehdr.e_machine == EM_SPARCV9) { 7711011SAndreas.Sandberg@ARM.com arch = ObjectFile::SPARC64; 7811011SAndreas.Sandberg@ARM.com } else if (ehdr.e_machine == EM_SPARC32PLUS || 7911011SAndreas.Sandberg@ARM.com (ehdr.e_machine == EM_SPARC && 8011011SAndreas.Sandberg@ARM.com ehdr.e_ident[EI_CLASS] == ELFCLASS32)) { 8111011SAndreas.Sandberg@ARM.com arch = ObjectFile::SPARC32; 8211011SAndreas.Sandberg@ARM.com } else if (ehdr.e_machine == EM_MIPS 8311011SAndreas.Sandberg@ARM.com && ehdr.e_ident[EI_CLASS] == ELFCLASS32) { 8411011SAndreas.Sandberg@ARM.com if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB) { 857584SAli.Saidi@arm.com arch = ObjectFile::Mips; 867584SAli.Saidi@arm.com } else { 877584SAli.Saidi@arm.com fatal("The binary you're trying to load is compiled for big " 887584SAli.Saidi@arm.com "endian MIPS. M5\nonly supports little endian MIPS. " 897584SAli.Saidi@arm.com "Please recompile your binary.\n"); 907584SAli.Saidi@arm.com } 917584SAli.Saidi@arm.com } else if (ehdr.e_machine == EM_X86_64 && 927584SAli.Saidi@arm.com ehdr.e_ident[EI_CLASS] == ELFCLASS64) { 937584SAli.Saidi@arm.com arch = ObjectFile::X86_64; 947584SAli.Saidi@arm.com } else if (ehdr.e_machine == EM_386 && 957584SAli.Saidi@arm.com ehdr.e_ident[EI_CLASS] == ELFCLASS32) { 967584SAli.Saidi@arm.com arch = ObjectFile::I386; 977584SAli.Saidi@arm.com } else if (ehdr.e_ident[EI_CLASS] == ELFCLASS64) { 987584SAli.Saidi@arm.com arch = ObjectFile::Alpha; 997584SAli.Saidi@arm.com } else if (ehdr.e_machine == EM_ARM) { 1007584SAli.Saidi@arm.com if (bits(ehdr.e_entry, 0)) { 1017584SAli.Saidi@arm.com arch = ObjectFile::Thumb; 1027584SAli.Saidi@arm.com } else { 1037584SAli.Saidi@arm.com arch = ObjectFile::Arm; 1047584SAli.Saidi@arm.com } 1057584SAli.Saidi@arm.com } else if (ehdr.e_machine == EM_PPC && 1067584SAli.Saidi@arm.com ehdr.e_ident[EI_CLASS] == ELFCLASS32) { 1077584SAli.Saidi@arm.com if (ehdr.e_ident[EI_DATA] == ELFDATA2MSB) { 1087584SAli.Saidi@arm.com arch = ObjectFile::Power; 1097584SAli.Saidi@arm.com } else { 1107584SAli.Saidi@arm.com fatal("The binary you're trying to load is compiled for " 1117584SAli.Saidi@arm.com "little endian Power.\nM5 only supports big " 1127584SAli.Saidi@arm.com "endian Power. Please recompile your binary.\n"); 1138524SAli.Saidi@ARM.com } 1148524SAli.Saidi@ARM.com } else if (ehdr.e_machine == EM_PPC64) { 1159958Smatt.evans@arm.com fatal("The binary you're trying to load is compiled for 64-bit " 1169958Smatt.evans@arm.com "Power. M5\n only supports 32-bit Power. Please " 1178524SAli.Saidi@ARM.com "recompile your binary.\n"); 1187584SAli.Saidi@arm.com } else { 1197584SAli.Saidi@arm.com warn("Unknown architecture: %d\n", ehdr.e_machine); 1207584SAli.Saidi@arm.com arch = ObjectFile::UnknownArch; 1217584SAli.Saidi@arm.com } 1227584SAli.Saidi@arm.com 1237584SAli.Saidi@arm.com //Detect the operating system 1247584SAli.Saidi@arm.com switch (ehdr.e_ident[EI_OSABI]) 1257950SAli.Saidi@ARM.com { 1267950SAli.Saidi@ARM.com 1277950SAli.Saidi@ARM.com case ELFOSABI_LINUX: 1287950SAli.Saidi@ARM.com opSys = ObjectFile::Linux; 1297950SAli.Saidi@ARM.com break; 1307950SAli.Saidi@ARM.com case ELFOSABI_SOLARIS: 13111011SAndreas.Sandberg@ARM.com opSys = ObjectFile::Solaris; 13211011SAndreas.Sandberg@ARM.com break; 13311011SAndreas.Sandberg@ARM.com case ELFOSABI_TRU64: 13411011SAndreas.Sandberg@ARM.com opSys = ObjectFile::Tru64; 13511011SAndreas.Sandberg@ARM.com break; 13611011SAndreas.Sandberg@ARM.com case ELFOSABI_ARM: 13711011SAndreas.Sandberg@ARM.com opSys = ObjectFile::LinuxArmOABI; 13811011SAndreas.Sandberg@ARM.com break; 13911011SAndreas.Sandberg@ARM.com default: 14011011SAndreas.Sandberg@ARM.com opSys = ObjectFile::UnknownOpSys; 14111011SAndreas.Sandberg@ARM.com } 14211011SAndreas.Sandberg@ARM.com 1437950SAli.Saidi@ARM.com //take a look at the .note.ABI section 1447950SAli.Saidi@ARM.com //It can let us know what's what. 1458281SAli.Saidi@ARM.com if (opSys == ObjectFile::UnknownOpSys) { 1468281SAli.Saidi@ARM.com Elf_Scn *section; 1478281SAli.Saidi@ARM.com GElf_Shdr shdr; 1488281SAli.Saidi@ARM.com Elf_Data *data; 1498281SAli.Saidi@ARM.com uint32_t osAbi;; 1508281SAli.Saidi@ARM.com int secIdx = 1; 1518281SAli.Saidi@ARM.com 1529958Smatt.evans@arm.com // Get the first section 1539958Smatt.evans@arm.com section = elf_getscn(elf, secIdx); 1549958Smatt.evans@arm.com 1559958Smatt.evans@arm.com // While there are no more sections 1567584SAli.Saidi@arm.com while (section != NULL && opSys == ObjectFile::UnknownOpSys) { 1577584SAli.Saidi@arm.com gelf_getshdr(section, &shdr); 1587584SAli.Saidi@arm.com if (shdr.sh_type == SHT_NOTE && !strcmp(".note.ABI-tag", 1597584SAli.Saidi@arm.com elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name))) { 1607584SAli.Saidi@arm.com // we have found a ABI note section 1617584SAli.Saidi@arm.com // Check the 5th 32bit word for OS 0 == linux, 1 == hurd, 1627584SAli.Saidi@arm.com // 2 == solaris, 3 == freebsd 1637584SAli.Saidi@arm.com data = elf_rawdata(section, NULL); 1647584SAli.Saidi@arm.com assert(data->d_buf); 1657584SAli.Saidi@arm.com if(ehdr.e_ident[EI_DATA] == ELFDATA2LSB) 1667584SAli.Saidi@arm.com osAbi = htole(((uint32_t*)data->d_buf)[4]); 1677584SAli.Saidi@arm.com else 1687584SAli.Saidi@arm.com osAbi = htobe(((uint32_t*)data->d_buf)[4]); 1697584SAli.Saidi@arm.com 1707584SAli.Saidi@arm.com switch(osAbi) { 1717584SAli.Saidi@arm.com case 0: 1727584SAli.Saidi@arm.com opSys = ObjectFile::Linux; 1737584SAli.Saidi@arm.com break; 17411011SAndreas.Sandberg@ARM.com case 2: 1757584SAli.Saidi@arm.com opSys = ObjectFile::Solaris; 1767584SAli.Saidi@arm.com break; 1777584SAli.Saidi@arm.com } 1787584SAli.Saidi@arm.com } // if section found 1797584SAli.Saidi@arm.com if (!strcmp(".SUNW_version", elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name))) 1807584SAli.Saidi@arm.com opSys = ObjectFile::Solaris; 18111011SAndreas.Sandberg@ARM.com if (!strcmp(".stab.index", elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name))) 1827584SAli.Saidi@arm.com opSys = ObjectFile::Solaris; 18310905Sandreas.sandberg@arm.com 18410905Sandreas.sandberg@arm.com section = elf_getscn(elf, ++secIdx); 18511011SAndreas.Sandberg@ARM.com } // while sections 18611011SAndreas.Sandberg@ARM.com } 18711011SAndreas.Sandberg@ARM.com 18811011SAndreas.Sandberg@ARM.com ElfObject * result = new ElfObject(fname, fd, len, data, arch, opSys); 18911011SAndreas.Sandberg@ARM.com 19011011SAndreas.Sandberg@ARM.com //The number of headers in the file 19111011SAndreas.Sandberg@ARM.com result->_programHeaderCount = ehdr.e_phnum; 19211011SAndreas.Sandberg@ARM.com //Record the size of each entry 1937584SAli.Saidi@arm.com result->_programHeaderSize = ehdr.e_phentsize; 1947584SAli.Saidi@arm.com if(result->_programHeaderCount) //If there is a program header table 19511011SAndreas.Sandberg@ARM.com { 19611011SAndreas.Sandberg@ARM.com //Figure out the virtual address of the header table in the 19711011SAndreas.Sandberg@ARM.com //final memory image. We use the program headers themselves 19811011SAndreas.Sandberg@ARM.com //to translate from a file offset to the address in the image. 19911011SAndreas.Sandberg@ARM.com GElf_Phdr phdr; 20011011SAndreas.Sandberg@ARM.com uint64_t e_phoff = ehdr.e_phoff; 20111011SAndreas.Sandberg@ARM.com result->_programHeaderTable = 0; 20211011SAndreas.Sandberg@ARM.com for(int hdrnum = 0; hdrnum < result->_programHeaderCount; hdrnum++) 20311011SAndreas.Sandberg@ARM.com { 20411011SAndreas.Sandberg@ARM.com gelf_getphdr(elf, hdrnum, &phdr); 20511011SAndreas.Sandberg@ARM.com //Check if we've found the segment with the headers in it 20611011SAndreas.Sandberg@ARM.com if(phdr.p_offset <= e_phoff && 20711011SAndreas.Sandberg@ARM.com phdr.p_offset + phdr.p_filesz > e_phoff) 20811011SAndreas.Sandberg@ARM.com { 20911011SAndreas.Sandberg@ARM.com result->_programHeaderTable = phdr.p_paddr + e_phoff; 21011011SAndreas.Sandberg@ARM.com break; 21111011SAndreas.Sandberg@ARM.com } 21211011SAndreas.Sandberg@ARM.com } 21311011SAndreas.Sandberg@ARM.com } 21411011SAndreas.Sandberg@ARM.com else 21511011SAndreas.Sandberg@ARM.com result->_programHeaderTable = 0; 21611011SAndreas.Sandberg@ARM.com 21711011SAndreas.Sandberg@ARM.com 21811011SAndreas.Sandberg@ARM.com elf_end(elf); 21911011SAndreas.Sandberg@ARM.com return result; 22011011SAndreas.Sandberg@ARM.com } 22111011SAndreas.Sandberg@ARM.com} 2227584SAli.Saidi@arm.com 2237584SAli.Saidi@arm.com 224ElfObject::ElfObject(const string &_filename, int _fd, 225 size_t _len, uint8_t *_data, 226 Arch _arch, OpSys _opSys) 227 : ObjectFile(_filename, _fd, _len, _data, _arch, _opSys) 228 229{ 230 Elf *elf; 231 GElf_Ehdr ehdr; 232 233 // check that header matches library version 234 if (elf_version(EV_CURRENT) == EV_NONE) 235 panic("wrong elf version number!"); 236 237 // get a pointer to elf structure 238 elf = elf_memory((char*)fileData,len); 239 // will only fail if fd is invalid 240 assert(elf != NULL); 241 242 // Check that we actually have a elf file 243 if (gelf_getehdr(elf, &ehdr) ==0) { 244 panic("Not ELF, shouldn't be here"); 245 } 246 247 entry = ehdr.e_entry; 248 249 // initialize segment sizes to 0 in case they're not present 250 text.size = data.size = bss.size = 0; 251 252 int secIdx = 1; 253 Elf_Scn *section; 254 GElf_Shdr shdr; 255 256 // The first address of some important sections. 257 Addr textSecStart = 0; 258 Addr dataSecStart = 0; 259 Addr bssSecStart = 0; 260 261 // Get the first section 262 section = elf_getscn(elf, secIdx); 263 264 // Find the beginning of the most interesting sections. 265 while (section != NULL) { 266 gelf_getshdr(section, &shdr); 267 char * secName = elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name); 268 269 if (secName) { 270 if (!strcmp(".text", secName)) { 271 textSecStart = shdr.sh_addr; 272 } else if (!strcmp(".data", secName)) { 273 dataSecStart = shdr.sh_addr; 274 } else if (!strcmp(".bss", secName)) { 275 bssSecStart = shdr.sh_addr; 276 } 277 } else { 278 Elf_Error errorNum = (Elf_Error)elf_errno(); 279 if (errorNum != ELF_E_NONE) { 280 const char *errorMessage = elf_errmsg(errorNum); 281 fatal("Error from libelf: %s.\n", errorMessage); 282 } 283 } 284 285 section = elf_getscn(elf, ++secIdx); 286 } 287 288 // Go through all the segments in the program, record them, and scrape 289 // out information about the text, data, and bss areas needed by other 290 // code. 291 for (int i = 0; i < ehdr.e_phnum; ++i) { 292 GElf_Phdr phdr; 293 if (gelf_getphdr(elf, i, &phdr) == 0) { 294 panic("gelf_getphdr failed for segment %d.", i); 295 } 296 297 // for now we don't care about non-loadable segments 298 if (!(phdr.p_type & PT_LOAD)) 299 continue; 300 301 // Check to see if this segment contains the bss section. 302 if (phdr.p_paddr <= bssSecStart && 303 phdr.p_paddr + phdr.p_memsz > bssSecStart && 304 phdr.p_memsz - phdr.p_filesz > 0) { 305 bss.baseAddr = phdr.p_paddr + phdr.p_filesz; 306 bss.size = phdr.p_memsz - phdr.p_filesz; 307 bss.fileImage = NULL; 308 } 309 310 // Check to see if this is the text or data segment 311 if (phdr.p_vaddr <= textSecStart && 312 phdr.p_vaddr + phdr.p_filesz > textSecStart) { 313 text.baseAddr = phdr.p_paddr; 314 text.size = phdr.p_filesz; 315 text.fileImage = fileData + phdr.p_offset; 316 } else if (phdr.p_vaddr <= dataSecStart && 317 phdr.p_vaddr + phdr.p_filesz > dataSecStart) { 318 data.baseAddr = phdr.p_paddr; 319 data.size = phdr.p_filesz; 320 data.fileImage = fileData + phdr.p_offset; 321 } else { 322 // If it's none of the above but is loadable, 323 // load the filesize worth of data 324 Segment extra; 325 extra.baseAddr = phdr.p_paddr; 326 extra.size = phdr.p_filesz; 327 extra.fileImage = fileData + phdr.p_offset; 328 extraSegments.push_back(extra); 329 } 330 } 331 332 // should have found at least one loadable segment 333 assert(text.size != 0); 334 335 DPRINTFR(Loader, "text: 0x%x %d\ndata: 0x%x %d\nbss: 0x%x %d\n", 336 text.baseAddr, text.size, data.baseAddr, data.size, 337 bss.baseAddr, bss.size); 338 339 elf_end(elf); 340 341 // We will actually read the sections when we need to load them 342} 343 344 345bool 346ElfObject::loadSomeSymbols(SymbolTable *symtab, int binding, Addr mask) 347{ 348 Elf *elf; 349 int sec_idx = 1; // there is a 0 but it is nothing, go figure 350 Elf_Scn *section; 351 GElf_Shdr shdr; 352 Elf_Data *data; 353 int count, ii; 354 bool found = false; 355 GElf_Sym sym; 356 357 if (!symtab) 358 return false; 359 360 // check that header matches library version 361 if (elf_version(EV_CURRENT) == EV_NONE) 362 panic("wrong elf version number!"); 363 364 // get a pointer to elf structure 365 elf = elf_memory((char*)fileData,len); 366 367 assert(elf != NULL); 368 369 // Get the first section 370 section = elf_getscn(elf, sec_idx); 371 372 // While there are no more sections 373 while (section != NULL) { 374 gelf_getshdr(section, &shdr); 375 376 if (shdr.sh_type == SHT_SYMTAB) { 377 found = true; 378 data = elf_getdata(section, NULL); 379 count = shdr.sh_size / shdr.sh_entsize; 380 DPRINTF(Loader, "Found Symbol Table, %d symbols present\n", count); 381 382 // loop through all the symbols, only loading global ones 383 for (ii = 0; ii < count; ++ii) { 384 gelf_getsym(data, ii, &sym); 385 if (GELF_ST_BIND(sym.st_info) == binding) { 386 char *sym_name = elf_strptr(elf, shdr.sh_link, sym.st_name); 387 if (sym_name && sym_name[0] != '$') { 388 DPRINTF(Loader, "Symbol: %-40s value %#x\n", 389 sym_name, sym.st_value); 390 symtab->insert(sym.st_value & mask, sym_name); 391 } 392 } 393 } 394 } 395 ++sec_idx; 396 section = elf_getscn(elf, sec_idx); 397 } 398 399 elf_end(elf); 400 401 return found; 402} 403 404bool 405ElfObject::loadGlobalSymbols(SymbolTable *symtab, Addr addrMask) 406{ 407 return loadSomeSymbols(symtab, STB_GLOBAL, addrMask); 408} 409 410bool 411ElfObject::loadLocalSymbols(SymbolTable *symtab, Addr addrMask) 412{ 413 return loadSomeSymbols(symtab, STB_LOCAL, addrMask); 414} 415 416bool 417ElfObject::loadSections(PortProxy& memProxy, Addr addrMask) 418{ 419 if (!ObjectFile::loadSections(memProxy, addrMask)) 420 return false; 421 422 vector<Segment>::iterator extraIt; 423 for (extraIt = extraSegments.begin(); 424 extraIt != extraSegments.end(); extraIt++) { 425 if (!loadSection(&(*extraIt), memProxy, addrMask)) { 426 return false; 427 } 428 } 429 return true; 430} 431 432void 433ElfObject::getSections() 434{ 435 Elf *elf; 436 int sec_idx = 1; // there is a 0 but it is nothing, go figure 437 Elf_Scn *section; 438 GElf_Shdr shdr; 439 440 GElf_Ehdr ehdr; 441 442 assert(!sectionNames.size()); 443 444 // check that header matches library version 445 if (elf_version(EV_CURRENT) == EV_NONE) 446 panic("wrong elf version number!"); 447 448 // get a pointer to elf structure 449 elf = elf_memory((char*)fileData,len); 450 assert(elf != NULL); 451 452 // Check that we actually have a elf file 453 if (gelf_getehdr(elf, &ehdr) ==0) { 454 panic("Not ELF, shouldn't be here"); 455 } 456 457 // Get the first section 458 section = elf_getscn(elf, sec_idx); 459 460 // While there are no more sections 461 while (section != NULL) { 462 gelf_getshdr(section, &shdr); 463 sectionNames.insert(elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name)); 464 section = elf_getscn(elf, ++sec_idx); 465 } // while sections 466} 467 468bool 469ElfObject::sectionExists(string sec) 470{ 471 if (!sectionNames.size()) 472 getSections(); 473 return sectionNames.find(sec) != sectionNames.end(); 474} 475 476 477