aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * Copyright 2012, 2013 SAP AG. 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: 
aoqi@0: ElfFuncDescTable::ElfFuncDescTable(FILE* file, Elf_Shdr shdr, int index) {
aoqi@0:   assert(file, "null file handle");
aoqi@0:   // The actual function address (i.e. function entry point) is always the
aoqi@0:   // first value in the function descriptor (on IA64 and PPC64 they look as follows):
aoqi@0:   // PPC64: [function entry point, TOC pointer, environment pointer]
aoqi@0:   // IA64 : [function entry point, GP (global pointer) value]
aoqi@0:   // Unfortunately 'shdr.sh_entsize' doesn't always seem to contain this size (it's zero on PPC64) so we can't assert
aoqi@0:   // assert(IA64_ONLY(2) PPC64_ONLY(3) * sizeof(address) == shdr.sh_entsize, "Size mismatch for '.opd' section entries");
aoqi@0: 
aoqi@0:   m_funcDescs = NULL;
aoqi@0:   m_file = file;
aoqi@0:   m_index = index;
aoqi@0:   m_status = NullDecoder::no_error;
aoqi@0: 
aoqi@0:   // try to load the function descriptor 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_funcDescs = (address*)os::malloc(shdr.sh_size, mtInternal);
aoqi@0:     if (m_funcDescs) {
aoqi@0:       if (fseek(file, shdr.sh_offset, SEEK_SET) ||
aoqi@0:           fread((void*)m_funcDescs, 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_funcDescs);
aoqi@0:         m_funcDescs = 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: ElfFuncDescTable::~ElfFuncDescTable() {
aoqi@0:   if (m_funcDescs != NULL) {
aoqi@0:     os::free(m_funcDescs);
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: address ElfFuncDescTable::lookup(Elf_Word index) {
aoqi@0:   if (NullDecoder::is_error(m_status)) {
aoqi@0:     return NULL;
aoqi@0:   }
aoqi@0: 
aoqi@0:   if (m_funcDescs != NULL) {
aoqi@0:     if (m_shdr.sh_size > 0 && m_shdr.sh_addr <= index && index <= m_shdr.sh_addr + m_shdr.sh_size) {
aoqi@0:       // Notice that 'index' is a byte-offset into the function descriptor table.
aoqi@0:       return m_funcDescs[(index - m_shdr.sh_addr) / sizeof(address)];
aoqi@0:     }
aoqi@0:     return NULL;
aoqi@0:   } else {
aoqi@0:     long cur_pos;
aoqi@0:     address addr;
aoqi@0:     if (!(m_shdr.sh_size > 0 && m_shdr.sh_addr <= index && index <= m_shdr.sh_addr + m_shdr.sh_size)) {
aoqi@0:       // don't put the whole decoder in error mode if we just tried a wrong index
aoqi@0:       return NULL;
aoqi@0:     }
aoqi@0:     if ((cur_pos = ftell(m_file)) == -1 ||
aoqi@0:         fseek(m_file, m_shdr.sh_offset + index - m_shdr.sh_addr, SEEK_SET) ||
aoqi@0:         fread(&addr, sizeof(addr), 1, m_file) != 1 ||
aoqi@0:         fseek(m_file, cur_pos, SEEK_SET)) {
aoqi@0:       m_status = NullDecoder::file_invalid;
aoqi@0:       return NULL;
aoqi@0:     }
aoqi@0:     return addr;
aoqi@0:   }
aoqi@0: }
aoqi@0: 
aoqi@0: #endif // !_WINDOWS && !__APPLE__