| /* |
| * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| |
| #if !defined(_WINDOWS) && !defined(__APPLE__) |
| |
| #include "memory/allocation.inline.hpp" |
| #include "utilities/elfFuncDescTable.hpp" |
| #include "utilities/elfSymbolTable.hpp" |
| |
| ElfSymbolTable::ElfSymbolTable(FILE* file, Elf_Shdr shdr) { |
| assert(file, "null file handle"); |
| m_symbols = NULL; |
| m_next = NULL; |
| m_file = file; |
| m_status = NullDecoder::no_error; |
| |
| // try to load the string table |
| long cur_offset = ftell(file); |
| if (cur_offset != -1) { |
| // call malloc so we can back up if memory allocation fails. |
| m_symbols = (Elf_Sym*)os::malloc(shdr.sh_size, mtInternal); |
| if (m_symbols) { |
| if (fseek(file, shdr.sh_offset, SEEK_SET) || |
| fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 || |
| fseek(file, cur_offset, SEEK_SET)) { |
| m_status = NullDecoder::file_invalid; |
| os::free(m_symbols); |
| m_symbols = NULL; |
| } |
| } |
| if (!NullDecoder::is_error(m_status)) { |
| memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr)); |
| } |
| } else { |
| m_status = NullDecoder::file_invalid; |
| } |
| } |
| |
| ElfSymbolTable::~ElfSymbolTable() { |
| if (m_symbols != NULL) { |
| os::free(m_symbols); |
| } |
| |
| if (m_next != NULL) { |
| delete m_next; |
| } |
| } |
| |
| bool ElfSymbolTable::compare(const Elf_Sym* sym, address addr, int* stringtableIndex, int* posIndex, int* offset, ElfFuncDescTable* funcDescTable) { |
| if (STT_FUNC == ELF_ST_TYPE(sym->st_info)) { |
| Elf_Word st_size = sym->st_size; |
| address sym_addr; |
| if (funcDescTable != NULL && funcDescTable->get_index() == sym->st_shndx) { |
| // We need to go another step trough the function descriptor table (currently PPC64 only) |
| sym_addr = funcDescTable->lookup(sym->st_value); |
| } else { |
| sym_addr = (address)sym->st_value; |
| } |
| if (sym_addr <= addr && (Elf_Word)(addr - sym_addr) < st_size) { |
| *offset = (int)(addr - sym_addr); |
| *posIndex = sym->st_name; |
| *stringtableIndex = m_shdr.sh_link; |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| bool ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset, ElfFuncDescTable* funcDescTable) { |
| assert(stringtableIndex, "null string table index pointer"); |
| assert(posIndex, "null string table offset pointer"); |
| assert(offset, "null offset pointer"); |
| |
| if (NullDecoder::is_error(m_status)) { |
| return false; |
| } |
| |
| size_t sym_size = sizeof(Elf_Sym); |
| assert((m_shdr.sh_size % sym_size) == 0, "check size"); |
| int count = m_shdr.sh_size / sym_size; |
| if (m_symbols != NULL) { |
| for (int index = 0; index < count; index ++) { |
| if (compare(&m_symbols[index], addr, stringtableIndex, posIndex, offset, funcDescTable)) { |
| return true; |
| } |
| } |
| } else { |
| long cur_pos; |
| if ((cur_pos = ftell(m_file)) == -1 || |
| fseek(m_file, m_shdr.sh_offset, SEEK_SET)) { |
| m_status = NullDecoder::file_invalid; |
| return false; |
| } |
| |
| Elf_Sym sym; |
| for (int index = 0; index < count; index ++) { |
| if (fread(&sym, sym_size, 1, m_file) == 1) { |
| if (compare(&sym, addr, stringtableIndex, posIndex, offset, funcDescTable)) { |
| return true; |
| } |
| } else { |
| m_status = NullDecoder::file_invalid; |
| return false; |
| } |
| } |
| fseek(m_file, cur_pos, SEEK_SET); |
| } |
| return false; |
| } |
| |
| #endif // !_WINDOWS && !__APPLE__ |