1 /* 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 27 #if !defined(_WINDOWS) && !defined(__APPLE__) 28 29 #include "memory/allocation.inline.hpp" 30 #include "utilities/elfSymbolTable.hpp" 31 32 ElfSymbolTable::ElfSymbolTable(FILE* file, Elf_Shdr shdr) { 33 assert(file, "null file handle"); 34 m_symbols = NULL; 35 m_next = NULL; 36 m_file = file; 37 m_status = Decoder::no_error; 38 39 // try to load the string table 40 long cur_offset = ftell(file); 41 if (cur_offset != -1) { 42 // call malloc so we can back up if memory allocation fails. 43 m_symbols = (Elf_Sym*)os::malloc(shdr.sh_size); 44 if (m_symbols) { 45 if (fseek(file, shdr.sh_offset, SEEK_SET) || 46 fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 || 47 fseek(file, cur_offset, SEEK_SET)) { 48 m_status = Decoder::file_invalid; 49 os::free(m_symbols); 50 m_symbols = NULL; 51 } 52 } 53 if (m_status == Decoder::no_error) { 54 memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr)); 55 } 56 } else { 57 m_status = Decoder::file_invalid; 58 } 59 } 60 61 ElfSymbolTable::~ElfSymbolTable() { 62 if (m_symbols != NULL) { 63 os::free(m_symbols); 64 } 65 66 if (m_next != NULL) { 67 delete m_next; 68 } 69 } 70 71 Decoder::decoder_status ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset) { 72 assert(stringtableIndex, "null string table index pointer"); 73 assert(posIndex, "null string table offset pointer"); 74 assert(offset, "null offset pointer"); 75 76 if (m_status != Decoder::no_error) { 77 return m_status; 78 } 79 80 address pc = 0; 81 size_t sym_size = sizeof(Elf_Sym); 82 assert((m_shdr.sh_size % sym_size) == 0, "check size"); 83 int count = m_shdr.sh_size / sym_size; 84 if (m_symbols != NULL) { 85 for (int index = 0; index < count; index ++) { 86 if (STT_FUNC == ELF_ST_TYPE(m_symbols[index].st_info)) { 87 address sym_addr = (address)m_symbols[index].st_value; 88 if (sym_addr < addr && (addr - sym_addr) < *offset) { 89 pc = (address)m_symbols[index].st_value; 90 *offset = (int)(addr - pc); 91 *posIndex = m_symbols[index].st_name; 92 *stringtableIndex = m_shdr.sh_link; 93 } 94 } 95 } 96 } else { 97 long cur_pos; 98 if ((cur_pos = ftell(m_file)) == -1 || 99 fseek(m_file, m_shdr.sh_offset, SEEK_SET)) { 100 m_status = Decoder::file_invalid; 101 return m_status; 102 } 103 104 Elf_Sym sym; 105 for (int index = 0; index < count; index ++) { 106 if (fread(&sym, sym_size, 1, m_file) == 1) { 107 if (STT_FUNC == ELF_ST_TYPE(sym.st_info)) { 108 address sym_addr = (address)sym.st_value; 109 if (sym_addr < addr && (addr - sym_addr) < *offset) { 110 pc = (address)sym.st_value; 111 *offset = (int)(addr - pc); 112 *posIndex = sym.st_name; 113 *stringtableIndex = m_shdr.sh_link; 114 } 115 } 116 } else { 117 m_status = Decoder::file_invalid; 118 return m_status; 119 } 120 } 121 fseek(m_file, cur_pos, SEEK_SET); 122 } 123 return m_status; 124 } 125 126 #endif // _WINDOWS