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