77 lines
2.8 KiB
C++
77 lines
2.8 KiB
C++
/*
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* Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2013 SAP SE. 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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_section(file, shdr), _file(file), _index(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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_status = _section.status();
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}
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ElfFuncDescTable::~ElfFuncDescTable() {
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}
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address ElfFuncDescTable::lookup(Elf_Word index) {
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if (NullDecoder::is_error(_status)) {
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return NULL;
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}
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address* func_descs = cached_func_descs();
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const Elf_Shdr* shdr = _section.section_header();
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if (!(shdr->sh_size > 0 && shdr->sh_addr <= index && index <= shdr->sh_addr + 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 (func_descs != NULL) {
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return func_descs[(index - shdr->sh_addr) / sizeof(address)];
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} else {
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MarkedFileReader mfd(_file);
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address addr;
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if (!mfd.has_mark() ||
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!mfd.set_position(shdr->sh_offset + index - shdr->sh_addr) ||
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!mfd.read((void*)&addr, sizeof(addr))) {
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_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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