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