1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/utilities/elfFuncDescTable.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,104 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * Copyright 2012, 2013 SAP AG. All rights reserved.
1.7 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.8 + *
1.9 + * This code is free software; you can redistribute it and/or modify it
1.10 + * under the terms of the GNU General Public License version 2 only, as
1.11 + * published by the Free Software Foundation.
1.12 + *
1.13 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.14 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.15 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.16 + * version 2 for more details (a copy is included in the LICENSE file that
1.17 + * accompanied this code).
1.18 + *
1.19 + * You should have received a copy of the GNU General Public License version
1.20 + * 2 along with this work; if not, write to the Free Software Foundation,
1.21 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.22 + *
1.23 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.24 + * or visit www.oracle.com if you need additional information or have any
1.25 + * questions.
1.26 + *
1.27 + */
1.28 +
1.29 +#include "precompiled.hpp"
1.30 +
1.31 +#if !defined(_WINDOWS) && !defined(__APPLE__)
1.32 +
1.33 +#include "memory/allocation.inline.hpp"
1.34 +#include "utilities/elfFuncDescTable.hpp"
1.35 +
1.36 +ElfFuncDescTable::ElfFuncDescTable(FILE* file, Elf_Shdr shdr, int index) {
1.37 + assert(file, "null file handle");
1.38 + // The actual function address (i.e. function entry point) is always the
1.39 + // first value in the function descriptor (on IA64 and PPC64 they look as follows):
1.40 + // PPC64: [function entry point, TOC pointer, environment pointer]
1.41 + // IA64 : [function entry point, GP (global pointer) value]
1.42 + // Unfortunately 'shdr.sh_entsize' doesn't always seem to contain this size (it's zero on PPC64) so we can't assert
1.43 + // assert(IA64_ONLY(2) PPC64_ONLY(3) * sizeof(address) == shdr.sh_entsize, "Size mismatch for '.opd' section entries");
1.44 +
1.45 + m_funcDescs = NULL;
1.46 + m_file = file;
1.47 + m_index = index;
1.48 + m_status = NullDecoder::no_error;
1.49 +
1.50 + // try to load the function descriptor table
1.51 + long cur_offset = ftell(file);
1.52 + if (cur_offset != -1) {
1.53 + // call malloc so we can back up if memory allocation fails.
1.54 + m_funcDescs = (address*)os::malloc(shdr.sh_size, mtInternal);
1.55 + if (m_funcDescs) {
1.56 + if (fseek(file, shdr.sh_offset, SEEK_SET) ||
1.57 + fread((void*)m_funcDescs, shdr.sh_size, 1, file) != 1 ||
1.58 + fseek(file, cur_offset, SEEK_SET)) {
1.59 + m_status = NullDecoder::file_invalid;
1.60 + os::free(m_funcDescs);
1.61 + m_funcDescs = NULL;
1.62 + }
1.63 + }
1.64 + if (!NullDecoder::is_error(m_status)) {
1.65 + memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
1.66 + }
1.67 + } else {
1.68 + m_status = NullDecoder::file_invalid;
1.69 + }
1.70 +}
1.71 +
1.72 +ElfFuncDescTable::~ElfFuncDescTable() {
1.73 + if (m_funcDescs != NULL) {
1.74 + os::free(m_funcDescs);
1.75 + }
1.76 +}
1.77 +
1.78 +address ElfFuncDescTable::lookup(Elf_Word index) {
1.79 + if (NullDecoder::is_error(m_status)) {
1.80 + return NULL;
1.81 + }
1.82 +
1.83 + if (m_funcDescs != NULL) {
1.84 + if (m_shdr.sh_size > 0 && m_shdr.sh_addr <= index && index <= m_shdr.sh_addr + m_shdr.sh_size) {
1.85 + // Notice that 'index' is a byte-offset into the function descriptor table.
1.86 + return m_funcDescs[(index - m_shdr.sh_addr) / sizeof(address)];
1.87 + }
1.88 + return NULL;
1.89 + } else {
1.90 + long cur_pos;
1.91 + address addr;
1.92 + if (!(m_shdr.sh_size > 0 && m_shdr.sh_addr <= index && index <= m_shdr.sh_addr + m_shdr.sh_size)) {
1.93 + // don't put the whole decoder in error mode if we just tried a wrong index
1.94 + return NULL;
1.95 + }
1.96 + if ((cur_pos = ftell(m_file)) == -1 ||
1.97 + fseek(m_file, m_shdr.sh_offset + index - m_shdr.sh_addr, SEEK_SET) ||
1.98 + fread(&addr, sizeof(addr), 1, m_file) != 1 ||
1.99 + fseek(m_file, cur_pos, SEEK_SET)) {
1.100 + m_status = NullDecoder::file_invalid;
1.101 + return NULL;
1.102 + }
1.103 + return addr;
1.104 + }
1.105 +}
1.106 +
1.107 +#endif // !_WINDOWS && !__APPLE__
