163 lines
4.5 KiB
C++
163 lines
4.5 KiB
C++
/*
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* Copyright (c) 1997, 2013, 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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#ifndef SHARE_VM_UTILITIES_ELF_FILE_HPP
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#define SHARE_VM_UTILITIES_ELF_FILE_HPP
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#if !defined(_WINDOWS) && !defined(__APPLE__)
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#if defined(__OpenBSD__)
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#include <sys/exec_elf.h>
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#else
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#include <elf.h>
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#endif
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#include <stdio.h>
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#ifdef _LP64
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typedef Elf64_Half Elf_Half;
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typedef Elf64_Word Elf_Word;
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typedef Elf64_Off Elf_Off;
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typedef Elf64_Addr Elf_Addr;
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typedef Elf64_Ehdr Elf_Ehdr;
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typedef Elf64_Shdr Elf_Shdr;
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typedef Elf64_Phdr Elf_Phdr;
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typedef Elf64_Sym Elf_Sym;
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#if !defined(_ALLBSD_SOURCE) || defined(__APPLE__)
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#define ELF_ST_TYPE ELF64_ST_TYPE
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#endif
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#else
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typedef Elf32_Half Elf_Half;
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typedef Elf32_Word Elf_Word;
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typedef Elf32_Off Elf_Off;
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typedef Elf32_Addr Elf_Addr;
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typedef Elf32_Ehdr Elf_Ehdr;
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typedef Elf32_Shdr Elf_Shdr;
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typedef Elf32_Phdr Elf_Phdr;
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typedef Elf32_Sym Elf_Sym;
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#if !defined(_ALLBSD_SOURCE) || defined(__APPLE__)
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#define ELF_ST_TYPE ELF32_ST_TYPE
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#endif
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#endif
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#include "globalDefinitions.hpp"
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#include "memory/allocation.hpp"
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#include "utilities/decoder.hpp"
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class ElfStringTable;
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class ElfSymbolTable;
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class ElfFuncDescTable;
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// On Solaris/Linux platforms, libjvm.so does contain all private symbols.
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// ElfFile is basically an elf file parser, which can lookup the symbol
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// that is the nearest to the given address.
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// Beware, this code is called from vm error reporting code, when vm is already
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// in "error" state, so there are scenarios, lookup will fail. We want this
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// part of code to be very defensive, and bait out if anything went wrong.
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class ElfFile: public CHeapObj<mtInternal> {
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friend class ElfDecoder;
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public:
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ElfFile(const char* filepath);
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~ElfFile();
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bool decode(address addr, char* buf, int buflen, int* offset);
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const char* filepath() {
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return m_filepath;
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}
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bool same_elf_file(const char* filepath) {
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assert(filepath, "null file path");
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assert(m_filepath, "already out of memory");
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return (m_filepath && !strcmp(filepath, m_filepath));
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}
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NullDecoder::decoder_status get_status() {
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return m_status;
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}
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private:
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// sanity check, if the file is a real elf file
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bool is_elf_file(Elf_Ehdr&);
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// load string tables from the elf file
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bool load_tables();
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// string tables are stored in a linked list
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void add_string_table(ElfStringTable* table);
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// symbol tables are stored in a linked list
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void add_symbol_table(ElfSymbolTable* table);
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// return a string table at specified section index
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ElfStringTable* get_string_table(int index);
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protected:
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ElfFile* next() const { return m_next; }
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void set_next(ElfFile* file) { m_next = file; }
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public:
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// Returns true if the elf file is marked NOT to require an executable stack,
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// or if the file could not be opened.
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// Returns false if the elf file requires an executable stack, the stack flag
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// is not set at all, or if the file can not be read.
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// On systems other than linux it always returns false.
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bool specifies_noexecstack() NOT_LINUX({ return false; });
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protected:
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ElfFile* m_next;
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private:
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// file
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const char* m_filepath;
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FILE* m_file;
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// Elf header
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Elf_Ehdr m_elfHdr;
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// symbol tables
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ElfSymbolTable* m_symbol_tables;
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// string tables
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ElfStringTable* m_string_tables;
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// function descriptors table
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ElfFuncDescTable* m_funcDesc_table;
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NullDecoder::decoder_status m_status;
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};
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#endif // !_WINDOWS && !__APPLE__
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#endif // SHARE_VM_UTILITIES_ELF_FILE_HPP
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