105 lines
3.7 KiB
C++
105 lines
3.7 KiB
C++
/*
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* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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* Copyright 2012, 2013 SAP AG. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#if !defined(_WINDOWS) && !defined(__APPLE__)
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#include "memory/allocation.inline.hpp"
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#include "utilities/elfFuncDescTable.hpp"
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ElfFuncDescTable::ElfFuncDescTable(FILE* file, Elf_Shdr shdr, int index) {
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assert(file, "null file handle");
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// The actual function address (i.e. function entry point) is always the
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// first value in the function descriptor (on IA64 and PPC64 they look as follows):
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// PPC64: [function entry point, TOC pointer, environment pointer]
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// IA64 : [function entry point, GP (global pointer) value]
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// Unfortunately 'shdr.sh_entsize' doesn't always seem to contain this size (it's zero on PPC64) so we can't assert
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// assert(IA64_ONLY(2) PPC64_ONLY(3) * sizeof(address) == shdr.sh_entsize, "Size mismatch for '.opd' section entries");
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m_funcDescs = NULL;
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m_file = file;
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m_index = index;
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m_status = NullDecoder::no_error;
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// try to load the function descriptor table
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long cur_offset = ftell(file);
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if (cur_offset != -1) {
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// call malloc so we can back up if memory allocation fails.
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m_funcDescs = (address*)os::malloc(shdr.sh_size, mtInternal);
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if (m_funcDescs) {
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if (fseek(file, shdr.sh_offset, SEEK_SET) ||
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fread((void*)m_funcDescs, shdr.sh_size, 1, file) != 1 ||
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fseek(file, cur_offset, SEEK_SET)) {
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m_status = NullDecoder::file_invalid;
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os::free(m_funcDescs);
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m_funcDescs = NULL;
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}
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}
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if (!NullDecoder::is_error(m_status)) {
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memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
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}
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} else {
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m_status = NullDecoder::file_invalid;
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}
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}
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ElfFuncDescTable::~ElfFuncDescTable() {
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if (m_funcDescs != NULL) {
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os::free(m_funcDescs);
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}
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}
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address ElfFuncDescTable::lookup(Elf_Word index) {
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if (NullDecoder::is_error(m_status)) {
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return NULL;
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}
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if (m_funcDescs != NULL) {
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if (m_shdr.sh_size > 0 && m_shdr.sh_addr <= index && index <= m_shdr.sh_addr + m_shdr.sh_size) {
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// Notice that 'index' is a byte-offset into the function descriptor table.
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return m_funcDescs[(index - m_shdr.sh_addr) / sizeof(address)];
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}
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return NULL;
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} else {
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long cur_pos;
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address addr;
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if (!(m_shdr.sh_size > 0 && m_shdr.sh_addr <= index && index <= m_shdr.sh_addr + m_shdr.sh_size)) {
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// don't put the whole decoder in error mode if we just tried a wrong index
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return NULL;
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}
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if ((cur_pos = ftell(m_file)) == -1 ||
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fseek(m_file, m_shdr.sh_offset + index - m_shdr.sh_addr, SEEK_SET) ||
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fread(&addr, sizeof(addr), 1, m_file) != 1 ||
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fseek(m_file, cur_pos, SEEK_SET)) {
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m_status = NullDecoder::file_invalid;
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return NULL;
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}
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return addr;
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}
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}
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#endif // !_WINDOWS && !__APPLE__
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