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src/share/vm/utilities/elfFile.hpp@04ff2f6cd0eb (annotated)

src/share/vm/utilities/elfFile.hpp

Tue, 17 Oct 2017 12:58:25 +0800

author

aoqi

date

Tue, 17 Oct 2017 12:58:25 +0800

changeset 7994

04ff2f6cd0eb

parent 6876

710a3c8b516e

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef SHARE_VM_UTILITIES_ELF_FILE_HPP
aoqi@0	26	#define SHARE_VM_UTILITIES_ELF_FILE_HPP
aoqi@0	27
aoqi@0	28	#if !defined(_WINDOWS) && !defined(__APPLE__)
aoqi@0	29
aoqi@0	30	#if defined(__OpenBSD__)
aoqi@0	31	#include <sys/exec_elf.h>
aoqi@0	32	#else
aoqi@0	33	#include <elf.h>
aoqi@0	34	#endif
aoqi@0	35	#include <stdio.h>
aoqi@0	36
aoqi@0	37	#ifdef _LP64
aoqi@0	38
aoqi@0	39	typedef Elf64_Half Elf_Half;
aoqi@0	40	typedef Elf64_Word Elf_Word;
aoqi@0	41	typedef Elf64_Off Elf_Off;
aoqi@0	42	typedef Elf64_Addr Elf_Addr;
aoqi@0	43
aoqi@0	44	typedef Elf64_Ehdr Elf_Ehdr;
aoqi@0	45	typedef Elf64_Shdr Elf_Shdr;
aoqi@0	46	typedef Elf64_Phdr Elf_Phdr;
aoqi@0	47	typedef Elf64_Sym Elf_Sym;
aoqi@0	48
aoqi@0	49	#if !defined(_ALLBSD_SOURCE) || defined(__APPLE__)
aoqi@0	50	#define ELF_ST_TYPE ELF64_ST_TYPE
aoqi@0	51	#endif
aoqi@0	52
aoqi@0	53	#else
aoqi@0	54
aoqi@0	55	typedef Elf32_Half Elf_Half;
aoqi@0	56	typedef Elf32_Word Elf_Word;
aoqi@0	57	typedef Elf32_Off Elf_Off;
aoqi@0	58	typedef Elf32_Addr Elf_Addr;
aoqi@0	59
aoqi@0	60
aoqi@0	61	typedef Elf32_Ehdr Elf_Ehdr;
aoqi@0	62	typedef Elf32_Shdr Elf_Shdr;
aoqi@0	63	typedef Elf32_Phdr Elf_Phdr;
aoqi@0	64	typedef Elf32_Sym Elf_Sym;
aoqi@0	65
aoqi@0	66	#if !defined(_ALLBSD_SOURCE) || defined(__APPLE__)
aoqi@0	67	#define ELF_ST_TYPE ELF32_ST_TYPE
aoqi@0	68	#endif
aoqi@0	69	#endif
aoqi@0	70
aoqi@0	71	#include "globalDefinitions.hpp"
aoqi@0	72	#include "memory/allocation.hpp"
aoqi@0	73	#include "utilities/decoder.hpp"
aoqi@0	74
aoqi@0	75
aoqi@0	76	class ElfStringTable;
aoqi@0	77	class ElfSymbolTable;
aoqi@0	78	class ElfFuncDescTable;
aoqi@0	79
aoqi@0	80
aoqi@0	81	// On Solaris/Linux platforms, libjvm.so does contain all private symbols.
aoqi@0	82	// ElfFile is basically an elf file parser, which can lookup the symbol
aoqi@0	83	// that is the nearest to the given address.
aoqi@0	84	// Beware, this code is called from vm error reporting code, when vm is already
aoqi@0	85	// in "error" state, so there are scenarios, lookup will fail. We want this
aoqi@0	86	// part of code to be very defensive, and bait out if anything went wrong.
aoqi@0	87
aoqi@0	88	class ElfFile: public CHeapObj<mtInternal> {
aoqi@0	89	friend class ElfDecoder;
aoqi@0	90	public:
aoqi@0	91	ElfFile(const char* filepath);
aoqi@0	92	~ElfFile();
aoqi@0	93
aoqi@0	94	bool decode(address addr, char* buf, int buflen, int* offset);
aoqi@0	95	const char* filepath() {
aoqi@0	96	return m_filepath;
aoqi@0	97	}
aoqi@0	98
aoqi@0	99	bool same_elf_file(const char* filepath) {
aoqi@0	100	assert(filepath, "null file path");
aoqi@0	101	assert(m_filepath, "already out of memory");
aoqi@0	102	return (m_filepath && !strcmp(filepath, m_filepath));
aoqi@0	103	}
aoqi@0	104
aoqi@0	105	NullDecoder::decoder_status get_status() {
aoqi@0	106	return m_status;
aoqi@0	107	}
aoqi@0	108
aoqi@0	109	private:
aoqi@0	110	// sanity check, if the file is a real elf file
aoqi@0	111	bool is_elf_file(Elf_Ehdr&);
aoqi@0	112
aoqi@0	113	// load string tables from the elf file
aoqi@0	114	bool load_tables();
aoqi@0	115
aoqi@0	116	// string tables are stored in a linked list
aoqi@0	117	void add_string_table(ElfStringTable* table);
aoqi@0	118
aoqi@0	119	// symbol tables are stored in a linked list
aoqi@0	120	void add_symbol_table(ElfSymbolTable* table);
aoqi@0	121
aoqi@0	122	// return a string table at specified section index
aoqi@0	123	ElfStringTable* get_string_table(int index);
aoqi@0	124
aoqi@0	125	protected:
aoqi@0	126	ElfFile* next() const { return m_next; }
aoqi@0	127	void set_next(ElfFile* file) { m_next = file; }
aoqi@0	128
aoqi@0	129	public:
aoqi@0	130	// Returns true if the elf file is marked NOT to require an executable stack,
aoqi@0	131	// or if the file could not be opened.
aoqi@0	132	// Returns false if the elf file requires an executable stack, the stack flag
aoqi@0	133	// is not set at all, or if the file can not be read.
aoqi@0	134	// On systems other than linux it always returns false.
aoqi@0	135	bool specifies_noexecstack() NOT_LINUX({ return false; });
aoqi@0	136
aoqi@0	137	protected:
aoqi@0	138	ElfFile* m_next;
aoqi@0	139
aoqi@0	140	private:
aoqi@0	141	// file
aoqi@0	142	const char* m_filepath;
aoqi@0	143	FILE* m_file;
aoqi@0	144
aoqi@0	145	// Elf header
aoqi@0	146	Elf_Ehdr m_elfHdr;
aoqi@0	147
aoqi@0	148	// symbol tables
aoqi@0	149	ElfSymbolTable* m_symbol_tables;
aoqi@0	150
aoqi@0	151	// string tables
aoqi@0	152	ElfStringTable* m_string_tables;
aoqi@0	153
aoqi@0	154	// function descriptors table
aoqi@0	155	ElfFuncDescTable* m_funcDesc_table;
aoqi@0	156
aoqi@0	157	NullDecoder::decoder_status m_status;
aoqi@0	158	};
aoqi@0	159
aoqi@0	160	#endif // !_WINDOWS && !__APPLE__
aoqi@0	161
aoqi@0	162	#endif // SHARE_VM_UTILITIES_ELF_FILE_HPP