| /* |
| * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2012, 2013 SAP SE. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| |
| #if !defined(_WINDOWS) && !defined(__APPLE__) |
| |
| #include "memory/allocation.inline.hpp" |
| #include "utilities/elfFuncDescTable.hpp" |
| |
| ElfFuncDescTable::ElfFuncDescTable(FILE* file, Elf_Shdr shdr, int index) : |
| _file(file), _index(index), _section(file, shdr) { |
| assert(file, "null file handle"); |
| // The actual function address (i.e. function entry point) is always the |
| // first value in the function descriptor (on IA64 and PPC64 they look as follows): |
| // PPC64: [function entry point, TOC pointer, environment pointer] |
| // IA64 : [function entry point, GP (global pointer) value] |
| // Unfortunately 'shdr.sh_entsize' doesn't always seem to contain this size (it's zero on PPC64) so we can't assert |
| // assert(IA64_ONLY(2) PPC64_ONLY(3) * sizeof(address) == shdr.sh_entsize, "Size mismatch for '.opd' section entries"); |
| |
| _status = _section.status(); |
| } |
| |
| ElfFuncDescTable::~ElfFuncDescTable() { |
| } |
| |
| address ElfFuncDescTable::lookup(Elf_Word index) { |
| if (NullDecoder::is_error(_status)) { |
| return NULL; |
| } |
| |
| address* func_descs = cached_func_descs(); |
| const Elf_Shdr* shdr = _section.section_header(); |
| if (!(shdr->sh_size > 0 && shdr->sh_addr <= index && index <= shdr->sh_addr + shdr->sh_size)) { |
| // don't put the whole decoder in error mode if we just tried a wrong index |
| return NULL; |
| } |
| |
| if (func_descs != NULL) { |
| return func_descs[(index - shdr->sh_addr) / sizeof(address)]; |
| } else { |
| MarkedFileReader mfd(_file); |
| address addr; |
| if (!mfd.has_mark() || |
| !mfd.set_position(shdr->sh_offset + index - shdr->sh_addr) || |
| !mfd.read((void*)&addr, sizeof(addr))) { |
| _status = NullDecoder::file_invalid; |
| return NULL; |
| } |
| return addr; |
| } |
| } |
| |
| #endif // !_WINDOWS && !__APPLE__ |