113 lines
3.7 KiB
C++
113 lines
3.7 KiB
C++
/*
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* Copyright (c) 1997, 2018, Oracle and/or its affiliates. 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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#include "utilities/elfSymbolTable.hpp"
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ElfSymbolTable::ElfSymbolTable(FILE* const file, Elf_Shdr& shdr) :
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_next(NULL), _fd(file), _section(file, shdr) {
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assert(file != NULL, "null file handle");
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_status = _section.status();
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if (_section.section_header()->sh_size % sizeof(Elf_Sym) != 0) {
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_status = NullDecoder::file_invalid;
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}
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}
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ElfSymbolTable::~ElfSymbolTable() {
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if (_next != NULL) {
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delete _next;
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}
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}
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bool ElfSymbolTable::compare(const Elf_Sym* sym, address addr, int* stringtableIndex, int* posIndex, int* offset, ElfFuncDescTable* funcDescTable) {
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if (STT_FUNC == ELF_ST_TYPE(sym->st_info)) {
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Elf_Word st_size = sym->st_size;
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const Elf_Shdr* shdr = _section.section_header();
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address sym_addr;
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if (funcDescTable != NULL && funcDescTable->get_index() == sym->st_shndx) {
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// We need to go another step trough the function descriptor table (currently PPC64 only)
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sym_addr = funcDescTable->lookup(sym->st_value);
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} else {
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sym_addr = (address)sym->st_value;
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}
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if (sym_addr <= addr && (Elf_Word)(addr - sym_addr) < st_size) {
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*offset = (int)(addr - sym_addr);
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*posIndex = sym->st_name;
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*stringtableIndex = shdr->sh_link;
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return true;
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}
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}
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return false;
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}
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bool ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset, ElfFuncDescTable* funcDescTable) {
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assert(stringtableIndex, "null string table index pointer");
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assert(posIndex, "null string table offset pointer");
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assert(offset, "null offset pointer");
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if (NullDecoder::is_error(get_status())) {
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return false;
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}
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size_t sym_size = sizeof(Elf_Sym);
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int count = _section.section_header()->sh_size / sym_size;
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Elf_Sym* symbols = (Elf_Sym*)_section.section_data();
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if (symbols != NULL) {
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for (int index = 0; index < count; index ++) {
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if (compare(&symbols[index], addr, stringtableIndex, posIndex, offset, funcDescTable)) {
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return true;
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}
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}
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} else {
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MarkedFileReader mfd(_fd);
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if (!mfd.has_mark() || !mfd.set_position(_section.section_header()->sh_offset)) {
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_status = NullDecoder::file_invalid;
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return false;
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}
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Elf_Sym sym;
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for (int index = 0; index < count; index ++) {
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if (!mfd.read((void*)&sym, sizeof(sym))) {
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_status = NullDecoder::file_invalid;
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return false;
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}
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if (compare(&sym, addr, stringtableIndex, posIndex, offset, funcDescTable)) {
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return true;
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}
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}
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}
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return false;
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}
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#endif // !_WINDOWS && !__APPLE__
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