elf_object.cc revision 5874
112SN/A/* 21762SN/A * Copyright (c) 2003-2005 The Regents of The University of Michigan 312SN/A * All rights reserved. 412SN/A * 512SN/A * Redistribution and use in source and binary forms, with or without 612SN/A * modification, are permitted provided that the following conditions are 712SN/A * met: redistributions of source code must retain the above copyright 812SN/A * notice, this list of conditions and the following disclaimer; 912SN/A * redistributions in binary form must reproduce the above copyright 1012SN/A * notice, this list of conditions and the following disclaimer in the 1112SN/A * documentation and/or other materials provided with the distribution; 1212SN/A * neither the name of the copyright holders nor the names of its 1312SN/A * contributors may be used to endorse or promote products derived from 1412SN/A * this software without specific prior written permission. 1512SN/A * 1612SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 1712SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 1812SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 1912SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 2012SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 2112SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 2212SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2312SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2412SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2512SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2612SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 272665Ssaidi@eecs.umich.edu * 282665Ssaidi@eecs.umich.edu * Authors: Steve Reinhardt 292665Ssaidi@eecs.umich.edu * Ali Saidi 3012SN/A */ 3112SN/A 325616Snate@binkert.org#include <cassert> 3312SN/A#include <string> 3412SN/A 352634Sstever@eecs.umich.edu#include "gelf.h" 36468SN/A 3756SN/A#include "base/loader/elf_object.hh" 384484Sbinkertn@umich.edu#include "base/loader/symtab.hh" 392439SN/A#include "base/misc.hh" 405543Ssaidi@eecs.umich.edu#include "base/trace.hh" // for DPRINTF 412423SN/A#include "sim/byteswap.hh" 422423SN/A 4312SN/Ausing namespace std; 4412SN/A 4512SN/AObjectFile * 4612SN/AElfObject::tryFile(const string &fname, int fd, size_t len, uint8_t *data) 4712SN/A{ 48443SN/A Elf *elf; 49443SN/A GElf_Ehdr ehdr; 502207SN/A Arch arch = UnknownArch; 512207SN/A OpSys opSys = UnknownOpSys; 52443SN/A 53468SN/A // check that header matches library version 541708SN/A if (elf_version(EV_CURRENT) == EV_NONE) 551708SN/A panic("wrong elf version number!"); 56443SN/A 57468SN/A // get a pointer to elf structure 58443SN/A elf = elf_memory((char*)data,len); 59468SN/A // will only fail if fd is invalid 60443SN/A assert(elf != NULL); 61443SN/A 62468SN/A // Check that we actually have a elf file 63468SN/A if (gelf_getehdr(elf, &ehdr) ==0) { 64443SN/A DPRINTFR(Loader, "Not ELF\n"); 65443SN/A elf_end(elf); 66443SN/A return NULL; 672476SN/A } else { 682207SN/A //Detect the architecture 692207SN/A //Since we don't know how to check for alpha right now, we'll 702207SN/A //just assume if it wasn't something else and it's 64 bit, that's 712207SN/A //what it must be. 722207SN/A if (ehdr.e_machine == EM_SPARC64 || 734111Sgblack@eecs.umich.edu (ehdr.e_machine == EM_SPARC && 744111Sgblack@eecs.umich.edu ehdr.e_ident[EI_CLASS] == ELFCLASS64)|| 752620SN/A ehdr.e_machine == EM_SPARCV9) { 764111Sgblack@eecs.umich.edu arch = ObjectFile::SPARC64; 774111Sgblack@eecs.umich.edu } else if (ehdr.e_machine == EM_SPARC32PLUS || 784111Sgblack@eecs.umich.edu (ehdr.e_machine == EM_SPARC && 794111Sgblack@eecs.umich.edu ehdr.e_ident[EI_CLASS] == ELFCLASS32)) { 804111Sgblack@eecs.umich.edu arch = ObjectFile::SPARC32; 812207SN/A } else if (ehdr.e_machine == EM_MIPS 822207SN/A && ehdr.e_ident[EI_CLASS] == ELFCLASS32) { 835383Sgblack@eecs.umich.edu if (ehdr.e_ident[EI_DATA] == ELFDATA2LSB) { 845383Sgblack@eecs.umich.edu arch = ObjectFile::Mips; 855383Sgblack@eecs.umich.edu } else { 865383Sgblack@eecs.umich.edu fatal("The binary you're trying to load is compiled for big " 875383Sgblack@eecs.umich.edu "endian MIPS. M5\nonly supports little endian MIPS. " 885383Sgblack@eecs.umich.edu "Please recompile your binary.\n"); 895383Sgblack@eecs.umich.edu } 904166Sgblack@eecs.umich.edu } else if (ehdr.e_machine == EM_X86_64 && 914166Sgblack@eecs.umich.edu ehdr.e_ident[EI_CLASS] == ELFCLASS64) { 925874Sgblack@eecs.umich.edu arch = ObjectFile::X86_64; 935874Sgblack@eecs.umich.edu } else if (ehdr.e_machine == EM_386 && 945874Sgblack@eecs.umich.edu ehdr.e_ident[EI_CLASS] == ELFCLASS32) { 955874Sgblack@eecs.umich.edu arch = ObjectFile::I386; 962207SN/A } else if (ehdr.e_ident[EI_CLASS] == ELFCLASS64) { 972207SN/A arch = ObjectFile::Alpha; 985335Shines@cs.fsu.edu } else if (ehdr.e_machine == EM_ARM) { 995335Shines@cs.fsu.edu arch = ObjectFile::Arm; 1002207SN/A } else { 1012600SN/A warn("Unknown architecture: %d\n", ehdr.e_machine); 1022207SN/A arch = ObjectFile::UnknownArch; 1032207SN/A } 1042207SN/A 1052207SN/A //Detect the operating system 1062207SN/A switch (ehdr.e_ident[EI_OSABI]) 1072207SN/A { 1082238SN/A 1092207SN/A case ELFOSABI_LINUX: 1105335Shines@cs.fsu.edu case ELFOSABI_ARM: 1112207SN/A opSys = ObjectFile::Linux; 1122207SN/A break; 1132207SN/A case ELFOSABI_SOLARIS: 1142207SN/A opSys = ObjectFile::Solaris; 1152238SN/A break; 1162207SN/A case ELFOSABI_TRU64: 1172207SN/A opSys = ObjectFile::Tru64; 1182238SN/A break; 1192207SN/A default: 1202207SN/A opSys = ObjectFile::UnknownOpSys; 1212207SN/A } 1222207SN/A 1232238SN/A //take a look at the .note.ABI section 1242238SN/A //It can let us know what's what. 1252600SN/A if (opSys == ObjectFile::UnknownOpSys) { 1262238SN/A Elf_Scn *section; 1272238SN/A GElf_Shdr shdr; 1282238SN/A Elf_Data *data; 1292238SN/A uint32_t osAbi;; 1302238SN/A int secIdx = 1; 1312238SN/A 1322238SN/A // Get the first section 1332238SN/A section = elf_getscn(elf, secIdx); 1342238SN/A 1352238SN/A // While there are no more sections 1362600SN/A while (section != NULL && opSys == ObjectFile::UnknownOpSys) { 1372238SN/A gelf_getshdr(section, &shdr); 1382238SN/A if (shdr.sh_type == SHT_NOTE && !strcmp(".note.ABI-tag", 1392238SN/A elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name))) { 1402238SN/A // we have found a ABI note section 1412238SN/A // Check the 5th 32bit word for OS 0 == linux, 1 == hurd, 1422238SN/A // 2 == solaris, 3 == freebsd 1432238SN/A data = elf_rawdata(section, NULL); 1442238SN/A assert(data->d_buf); 1452238SN/A if(ehdr.e_ident[EI_DATA] == ELFDATA2LSB) 1462238SN/A osAbi = htole(((uint32_t*)data->d_buf)[4]); 1472238SN/A else 1482238SN/A osAbi = htobe(((uint32_t*)data->d_buf)[4]); 1492238SN/A 1502238SN/A switch(osAbi) { 1512238SN/A case 0: 1522238SN/A opSys = ObjectFile::Linux; 1532238SN/A break; 1542238SN/A case 2: 1552238SN/A opSys = ObjectFile::Solaris; 1562238SN/A break; 1572238SN/A } 1582238SN/A } // if section found 1592600SN/A if (!strcmp(".SUNW_version", elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name))) 1602600SN/A opSys = ObjectFile::Solaris; 1612600SN/A if (!strcmp(".stab.index", elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name))) 1622600SN/A opSys = ObjectFile::Solaris; 1632600SN/A 1642238SN/A section = elf_getscn(elf, ++secIdx); 1652238SN/A } // while sections 1662238SN/A } 1672472SN/A 1682976Sgblack@eecs.umich.edu ElfObject * result = new ElfObject(fname, fd, len, data, arch, opSys); 1692976Sgblack@eecs.umich.edu 1702976Sgblack@eecs.umich.edu //The number of headers in the file 1712976Sgblack@eecs.umich.edu result->_programHeaderCount = ehdr.e_phnum; 1722976Sgblack@eecs.umich.edu //Record the size of each entry 1732976Sgblack@eecs.umich.edu result->_programHeaderSize = ehdr.e_phentsize; 1742976Sgblack@eecs.umich.edu if(result->_programHeaderCount) //If there is a program header table 1752976Sgblack@eecs.umich.edu { 1762976Sgblack@eecs.umich.edu //Figure out the virtual address of the header table in the 1772976Sgblack@eecs.umich.edu //final memory image. We use the program headers themselves 1782976Sgblack@eecs.umich.edu //to translate from a file offset to the address in the image. 1792976Sgblack@eecs.umich.edu GElf_Phdr phdr; 1802976Sgblack@eecs.umich.edu uint64_t e_phoff = ehdr.e_phoff; 1812976Sgblack@eecs.umich.edu result->_programHeaderTable = 0; 1822976Sgblack@eecs.umich.edu for(int hdrnum = 0; hdrnum < result->_programHeaderCount; hdrnum++) 1832976Sgblack@eecs.umich.edu { 1842976Sgblack@eecs.umich.edu gelf_getphdr(elf, hdrnum, &phdr); 1852976Sgblack@eecs.umich.edu //Check if we've found the segment with the headers in it 1862976Sgblack@eecs.umich.edu if(phdr.p_offset <= e_phoff && 1872976Sgblack@eecs.umich.edu phdr.p_offset + phdr.p_filesz > e_phoff) 1882976Sgblack@eecs.umich.edu { 1895143Sgblack@eecs.umich.edu result->_programHeaderTable = phdr.p_paddr + e_phoff; 1902976Sgblack@eecs.umich.edu break; 1912976Sgblack@eecs.umich.edu } 1922976Sgblack@eecs.umich.edu } 1932976Sgblack@eecs.umich.edu } 1942976Sgblack@eecs.umich.edu else 1952976Sgblack@eecs.umich.edu result->_programHeaderTable = 0; 1962976Sgblack@eecs.umich.edu 1972976Sgblack@eecs.umich.edu 1982238SN/A elf_end(elf); 1992976Sgblack@eecs.umich.edu return result; 20012SN/A } 20112SN/A} 20212SN/A 20312SN/A 20412SN/AElfObject::ElfObject(const string &_filename, int _fd, 205360SN/A size_t _len, uint8_t *_data, 206360SN/A Arch _arch, OpSys _opSys) 207360SN/A : ObjectFile(_filename, _fd, _len, _data, _arch, _opSys) 208443SN/A 20912SN/A{ 210443SN/A Elf *elf; 211443SN/A GElf_Ehdr ehdr; 21212SN/A 213468SN/A // check that header matches library version 2141708SN/A if (elf_version(EV_CURRENT) == EV_NONE) 2151708SN/A panic("wrong elf version number!"); 21612SN/A 217468SN/A // get a pointer to elf structure 218443SN/A elf = elf_memory((char*)fileData,len); 219468SN/A // will only fail if fd is invalid 220443SN/A assert(elf != NULL); 22112SN/A 222468SN/A // Check that we actually have a elf file 223468SN/A if (gelf_getehdr(elf, &ehdr) ==0) { 224443SN/A panic("Not ELF, shouldn't be here"); 22512SN/A } 22612SN/A 227468SN/A entry = ehdr.e_entry; 22812SN/A 229468SN/A // initialize segment sizes to 0 in case they're not present 230468SN/A text.size = data.size = bss.size = 0; 231468SN/A 2325090Sgblack@eecs.umich.edu int secIdx = 1; 2335090Sgblack@eecs.umich.edu Elf_Scn *section; 2345090Sgblack@eecs.umich.edu GElf_Shdr shdr; 2355090Sgblack@eecs.umich.edu 2365090Sgblack@eecs.umich.edu // The first address of some important sections. 2375090Sgblack@eecs.umich.edu Addr textSecStart = 0; 2385090Sgblack@eecs.umich.edu Addr dataSecStart = 0; 2395090Sgblack@eecs.umich.edu Addr bssSecStart = 0; 2405090Sgblack@eecs.umich.edu 2415090Sgblack@eecs.umich.edu // Get the first section 2425090Sgblack@eecs.umich.edu section = elf_getscn(elf, secIdx); 2435090Sgblack@eecs.umich.edu 2445090Sgblack@eecs.umich.edu // Find the beginning of the most interesting sections. 2455090Sgblack@eecs.umich.edu while (section != NULL) { 2465090Sgblack@eecs.umich.edu gelf_getshdr(section, &shdr); 2475090Sgblack@eecs.umich.edu char * secName = elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name); 2485090Sgblack@eecs.umich.edu 2495090Sgblack@eecs.umich.edu if (!strcmp(".text", secName)) { 2505090Sgblack@eecs.umich.edu textSecStart = shdr.sh_addr; 2515090Sgblack@eecs.umich.edu } else if (!strcmp(".data", secName)) { 2525090Sgblack@eecs.umich.edu dataSecStart = shdr.sh_addr; 2535090Sgblack@eecs.umich.edu } else if (!strcmp(".bss", secName)) { 2545090Sgblack@eecs.umich.edu bssSecStart = shdr.sh_addr; 2555090Sgblack@eecs.umich.edu } 2565090Sgblack@eecs.umich.edu 2575090Sgblack@eecs.umich.edu section = elf_getscn(elf, ++secIdx); 2585090Sgblack@eecs.umich.edu } 2595090Sgblack@eecs.umich.edu 2605090Sgblack@eecs.umich.edu // Go through all the segments in the program, record them, and scrape 2615090Sgblack@eecs.umich.edu // out information about the text, data, and bss areas needed by other 2625090Sgblack@eecs.umich.edu // code. 263468SN/A for (int i = 0; i < ehdr.e_phnum; ++i) { 264468SN/A GElf_Phdr phdr; 265468SN/A if (gelf_getphdr(elf, i, &phdr) == 0) { 2665090Sgblack@eecs.umich.edu panic("gelf_getphdr failed for segment %d.", i); 267468SN/A } 268468SN/A 269468SN/A // for now we don't care about non-loadable segments 270468SN/A if (!(phdr.p_type & PT_LOAD)) 271468SN/A continue; 272468SN/A 2735090Sgblack@eecs.umich.edu // Check to see if this segment contains the bss section. 2745143Sgblack@eecs.umich.edu if (phdr.p_paddr <= bssSecStart && 2755143Sgblack@eecs.umich.edu phdr.p_paddr + phdr.p_memsz > bssSecStart && 2765090Sgblack@eecs.umich.edu phdr.p_memsz - phdr.p_filesz > 0) { 2775143Sgblack@eecs.umich.edu bss.baseAddr = phdr.p_paddr + phdr.p_filesz; 2785090Sgblack@eecs.umich.edu bss.size = phdr.p_memsz - phdr.p_filesz; 2795090Sgblack@eecs.umich.edu bss.fileImage = NULL; 2805090Sgblack@eecs.umich.edu } 2815090Sgblack@eecs.umich.edu 2825090Sgblack@eecs.umich.edu // Check to see if this is the text or data segment 2835152Sgblack@eecs.umich.edu if (phdr.p_vaddr <= textSecStart && 2845152Sgblack@eecs.umich.edu phdr.p_vaddr + phdr.p_filesz > textSecStart) { 2855143Sgblack@eecs.umich.edu text.baseAddr = phdr.p_paddr; 286468SN/A text.size = phdr.p_filesz; 2872420SN/A text.fileImage = fileData + phdr.p_offset; 2885152Sgblack@eecs.umich.edu } else if (phdr.p_vaddr <= dataSecStart && 2895152Sgblack@eecs.umich.edu phdr.p_vaddr + phdr.p_filesz > dataSecStart) { 2905143Sgblack@eecs.umich.edu data.baseAddr = phdr.p_paddr; 291468SN/A data.size = phdr.p_filesz; 2922420SN/A data.fileImage = fileData + phdr.p_offset; 2932476SN/A } else { 2945759Shsul@eecs.umich.edu // If it's none of the above but is loadable, 2955759Shsul@eecs.umich.edu // load the filesize worth of data 2965090Sgblack@eecs.umich.edu Segment extra; 2975143Sgblack@eecs.umich.edu extra.baseAddr = phdr.p_paddr; 2985090Sgblack@eecs.umich.edu extra.size = phdr.p_filesz; 2995090Sgblack@eecs.umich.edu extra.fileImage = fileData + phdr.p_offset; 3005090Sgblack@eecs.umich.edu extraSegments.push_back(extra); 301468SN/A } 302468SN/A } 303468SN/A 304468SN/A // should have found at least one loadable segment 305468SN/A assert(text.size != 0); 306468SN/A 307468SN/A DPRINTFR(Loader, "text: 0x%x %d\ndata: 0x%x %d\nbss: 0x%x %d\n", 308468SN/A text.baseAddr, text.size, data.baseAddr, data.size, 309468SN/A bss.baseAddr, bss.size); 310468SN/A 311443SN/A elf_end(elf); 312443SN/A 313468SN/A // We will actually read the sections when we need to load them 31412SN/A} 31512SN/A 31612SN/A 31712SN/Abool 318468SN/AElfObject::loadSomeSymbols(SymbolTable *symtab, int binding) 31912SN/A{ 320443SN/A Elf *elf; 321766SN/A int sec_idx = 1; // there is a 0 but it is nothing, go figure 322443SN/A Elf_Scn *section; 323443SN/A GElf_Shdr shdr; 324443SN/A Elf_Data *data; 325443SN/A int count, ii; 326443SN/A bool found = false; 327443SN/A GElf_Sym sym; 328443SN/A 329443SN/A if (!symtab) 330443SN/A return false; 331443SN/A 332468SN/A // check that header matches library version 3331708SN/A if (elf_version(EV_CURRENT) == EV_NONE) 3341708SN/A panic("wrong elf version number!"); 335443SN/A 336468SN/A // get a pointer to elf structure 337443SN/A elf = elf_memory((char*)fileData,len); 338443SN/A 339443SN/A assert(elf != NULL); 340443SN/A 341468SN/A // Get the first section 342454SN/A section = elf_getscn(elf, sec_idx); 343443SN/A 344468SN/A // While there are no more sections 345468SN/A while (section != NULL) { 346443SN/A gelf_getshdr(section, &shdr); 347443SN/A 348468SN/A if (shdr.sh_type == SHT_SYMTAB) { 349443SN/A found = true; 350443SN/A data = elf_getdata(section, NULL); 351443SN/A count = shdr.sh_size / shdr.sh_entsize; 352443SN/A DPRINTF(Loader, "Found Symbol Table, %d symbols present\n", count); 353443SN/A 354468SN/A // loop through all the symbols, only loading global ones 355468SN/A for (ii = 0; ii < count; ++ii) { 356443SN/A gelf_getsym(data, ii, &sym); 357836SN/A if (GELF_ST_BIND(sym.st_info) == binding) { 358468SN/A symtab->insert(sym.st_value, 359468SN/A elf_strptr(elf, shdr.sh_link, sym.st_name)); 360443SN/A } 361443SN/A } 362443SN/A } 363454SN/A ++sec_idx; 364454SN/A section = elf_getscn(elf, sec_idx); 365443SN/A } 366443SN/A 367443SN/A elf_end(elf); 368443SN/A 369443SN/A return found; 37012SN/A} 37112SN/A 37212SN/Abool 3733812Ssaidi@eecs.umich.eduElfObject::loadGlobalSymbols(SymbolTable *symtab, Addr addrMask) 374468SN/A{ 375468SN/A return loadSomeSymbols(symtab, STB_GLOBAL); 376468SN/A} 377468SN/A 378468SN/Abool 3793812Ssaidi@eecs.umich.eduElfObject::loadLocalSymbols(SymbolTable *symtab, Addr addrMask) 38012SN/A{ 381468SN/A return loadSomeSymbols(symtab, STB_LOCAL); 38212SN/A} 3833917Ssaidi@eecs.umich.edu 3845090Sgblack@eecs.umich.edubool 3855090Sgblack@eecs.umich.eduElfObject::loadSections(Port *memPort, Addr addrMask) 3865090Sgblack@eecs.umich.edu{ 3875090Sgblack@eecs.umich.edu if (!ObjectFile::loadSections(memPort, addrMask)) 3885090Sgblack@eecs.umich.edu return false; 3895090Sgblack@eecs.umich.edu 3905090Sgblack@eecs.umich.edu vector<Segment>::iterator extraIt; 3915090Sgblack@eecs.umich.edu for (extraIt = extraSegments.begin(); 3925090Sgblack@eecs.umich.edu extraIt != extraSegments.end(); extraIt++) { 3935090Sgblack@eecs.umich.edu if (!loadSection(&(*extraIt), memPort, addrMask)) { 3945090Sgblack@eecs.umich.edu return false; 3955090Sgblack@eecs.umich.edu } 3965090Sgblack@eecs.umich.edu } 3975090Sgblack@eecs.umich.edu return true; 3985090Sgblack@eecs.umich.edu} 3995090Sgblack@eecs.umich.edu 4005070Ssaidi@eecs.umich.eduvoid 4015070Ssaidi@eecs.umich.eduElfObject::getSections() 4023917Ssaidi@eecs.umich.edu{ 4033917Ssaidi@eecs.umich.edu Elf *elf; 4043917Ssaidi@eecs.umich.edu int sec_idx = 1; // there is a 0 but it is nothing, go figure 4053917Ssaidi@eecs.umich.edu Elf_Scn *section; 4063917Ssaidi@eecs.umich.edu GElf_Shdr shdr; 4073917Ssaidi@eecs.umich.edu 4083917Ssaidi@eecs.umich.edu GElf_Ehdr ehdr; 4093917Ssaidi@eecs.umich.edu 4105070Ssaidi@eecs.umich.edu assert(!sectionNames.size()); 4115070Ssaidi@eecs.umich.edu 4123917Ssaidi@eecs.umich.edu // check that header matches library version 4133917Ssaidi@eecs.umich.edu if (elf_version(EV_CURRENT) == EV_NONE) 4143917Ssaidi@eecs.umich.edu panic("wrong elf version number!"); 4153917Ssaidi@eecs.umich.edu 4163917Ssaidi@eecs.umich.edu // get a pointer to elf structure 4173917Ssaidi@eecs.umich.edu elf = elf_memory((char*)fileData,len); 4183917Ssaidi@eecs.umich.edu assert(elf != NULL); 4193917Ssaidi@eecs.umich.edu 4203917Ssaidi@eecs.umich.edu // Check that we actually have a elf file 4213917Ssaidi@eecs.umich.edu if (gelf_getehdr(elf, &ehdr) ==0) { 4223917Ssaidi@eecs.umich.edu panic("Not ELF, shouldn't be here"); 4233917Ssaidi@eecs.umich.edu } 4243917Ssaidi@eecs.umich.edu 4253917Ssaidi@eecs.umich.edu // Get the first section 4263917Ssaidi@eecs.umich.edu section = elf_getscn(elf, sec_idx); 4273917Ssaidi@eecs.umich.edu 4283917Ssaidi@eecs.umich.edu // While there are no more sections 4293917Ssaidi@eecs.umich.edu while (section != NULL) { 4303917Ssaidi@eecs.umich.edu gelf_getshdr(section, &shdr); 4315070Ssaidi@eecs.umich.edu sectionNames.insert(elf_strptr(elf, ehdr.e_shstrndx, shdr.sh_name)); 4323917Ssaidi@eecs.umich.edu section = elf_getscn(elf, ++sec_idx); 4333917Ssaidi@eecs.umich.edu } // while sections 4343917Ssaidi@eecs.umich.edu} 4353917Ssaidi@eecs.umich.edu 4365070Ssaidi@eecs.umich.edubool 4375070Ssaidi@eecs.umich.eduElfObject::sectionExists(string sec) 4385070Ssaidi@eecs.umich.edu{ 4395070Ssaidi@eecs.umich.edu if (!sectionNames.size()) 4405070Ssaidi@eecs.umich.edu getSections(); 4415070Ssaidi@eecs.umich.edu return sectionNames.find(sec) != sectionNames.end(); 4425070Ssaidi@eecs.umich.edu} 4433917Ssaidi@eecs.umich.edu 4445070Ssaidi@eecs.umich.edu 445