zgu@2364: /*
mikael@4153:  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
zgu@2364:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
zgu@2364:  *
zgu@2364:  * This code is free software; you can redistribute it and/or modify it
zgu@2364:  * under the terms of the GNU General Public License version 2 only, as
zgu@2364:  * published by the Free Software Foundation.
zgu@2364:  *
zgu@2364:  * This code is distributed in the hope that it will be useful, but WITHOUT
zgu@2364:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
zgu@2364:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
zgu@2364:  * version 2 for more details (a copy is included in the LICENSE file that
zgu@2364:  * accompanied this code).
zgu@2364:  *
zgu@2364:  * You should have received a copy of the GNU General Public License version
zgu@2364:  * 2 along with this work; if not, write to the Free Software Foundation,
zgu@2364:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
zgu@2364:  *
zgu@2364:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
zgu@2364:  * or visit www.oracle.com if you need additional information or have any
zgu@2364:  * questions.
zgu@2364:  *
zgu@2364:  */
zgu@2364: 
zgu@2364: #include "precompiled.hpp"
zgu@2364: 
never@3156: #if !defined(_WINDOWS) && !defined(__APPLE__)
zgu@2364: 
zgu@2364: #include "memory/allocation.inline.hpp"
zgu@2364: #include "utilities/elfSymbolTable.hpp"
zgu@2364: 
zgu@2364: ElfSymbolTable::ElfSymbolTable(FILE* file, Elf_Shdr shdr) {
zgu@2364:   assert(file, "null file handle");
zgu@2364:   m_symbols = NULL;
zgu@2364:   m_next = NULL;
zgu@2364:   m_file = file;
zgu@3430:   m_status = NullDecoder::no_error;
zgu@2364: 
zgu@2364:   // try to load the string table
zgu@2364:   long cur_offset = ftell(file);
zgu@2364:   if (cur_offset != -1) {
coleenp@2512:     // call malloc so we can back up if memory allocation fails.
zgu@3900:     m_symbols = (Elf_Sym*)os::malloc(shdr.sh_size, mtInternal);
zgu@2364:     if (m_symbols) {
zgu@2364:       if (fseek(file, shdr.sh_offset, SEEK_SET) ||
zgu@2364:         fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 ||
zgu@2364:         fseek(file, cur_offset, SEEK_SET)) {
zgu@3430:         m_status = NullDecoder::file_invalid;
coleenp@2512:         os::free(m_symbols);
zgu@2364:         m_symbols = NULL;
zgu@2364:       }
zgu@2364:     }
zgu@3430:     if (!NullDecoder::is_error(m_status)) {
zgu@2364:       memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
zgu@2364:     }
zgu@2364:   } else {
zgu@3430:     m_status = NullDecoder::file_invalid;
zgu@2364:   }
zgu@2364: }
zgu@2364: 
zgu@2364: ElfSymbolTable::~ElfSymbolTable() {
zgu@2364:   if (m_symbols != NULL) {
coleenp@2512:     os::free(m_symbols);
zgu@2364:   }
zgu@2364: 
zgu@2364:   if (m_next != NULL) {
zgu@2364:     delete m_next;
zgu@2364:   }
zgu@2364: }
zgu@2364: 
zgu@3430: bool ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset) {
zgu@2364:   assert(stringtableIndex, "null string table index pointer");
zgu@2364:   assert(posIndex, "null string table offset pointer");
zgu@2364:   assert(offset, "null offset pointer");
zgu@2364: 
zgu@3430:   if (NullDecoder::is_error(m_status)) {
zgu@3430:     return false;
zgu@2364:   }
zgu@2364: 
zgu@2364:   address pc = 0;
zgu@2364:   size_t  sym_size = sizeof(Elf_Sym);
zgu@2364:   assert((m_shdr.sh_size % sym_size) == 0, "check size");
zgu@2364:   int count = m_shdr.sh_size / sym_size;
zgu@2364:   if (m_symbols != NULL) {
zgu@2364:     for (int index = 0; index < count; index ++) {
zgu@2364:       if (STT_FUNC == ELF_ST_TYPE(m_symbols[index].st_info)) {
zgu@2364:         address sym_addr = (address)m_symbols[index].st_value;
zgu@2364:         if (sym_addr < addr && (addr - sym_addr) < *offset) {
zgu@2364:           pc = (address)m_symbols[index].st_value;
zgu@2364:           *offset = (int)(addr - pc);
zgu@2364:           *posIndex = m_symbols[index].st_name;
zgu@2364:           *stringtableIndex = m_shdr.sh_link;
zgu@2364:         }
zgu@2364:       }
zgu@2364:     }
zgu@2364:   } else {
zgu@2364:     long cur_pos;
zgu@2364:     if ((cur_pos = ftell(m_file)) == -1 ||
zgu@2364:       fseek(m_file, m_shdr.sh_offset, SEEK_SET)) {
zgu@3430:       m_status = NullDecoder::file_invalid;
zgu@3430:       return false;
zgu@2364:     }
zgu@2364: 
zgu@2364:     Elf_Sym sym;
zgu@2364:     for (int index = 0; index < count; index ++) {
zgu@2364:       if (fread(&sym, sym_size, 1, m_file) == 1) {
zgu@2364:         if (STT_FUNC == ELF_ST_TYPE(sym.st_info)) {
zgu@2364:           address sym_addr = (address)sym.st_value;
zgu@2364:           if (sym_addr < addr && (addr - sym_addr) < *offset) {
zgu@2364:             pc = (address)sym.st_value;
zgu@2364:             *offset = (int)(addr - pc);
zgu@2364:             *posIndex = sym.st_name;
zgu@2364:             *stringtableIndex = m_shdr.sh_link;
zgu@2364:           }
zgu@2364:         }
zgu@2364:       } else {
zgu@3430:         m_status = NullDecoder::file_invalid;
zgu@3430:         return false;
zgu@2364:       }
zgu@2364:     }
zgu@2364:     fseek(m_file, cur_pos, SEEK_SET);
zgu@2364:   }
zgu@3430:   return true;
zgu@2364: }
zgu@2364: 
zgu@2364: #endif // _WINDOWS