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annotate src/share/vm/utilities/elfFile.cpp @ 17795:a9becfeecd1b

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Merge
author kvn
date Wed, 22 Jan 2014 17:42:23 -0800
parents 55fb97c4c58d e7cbc95179c4
children e5e8aa897002 4ca6dc0799b6
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1 /*
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26
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27 #if !defined(_WINDOWS) && !defined(__APPLE__)
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28
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29 #include <string.h>
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30 #include <stdio.h>
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31 #include <limits.h>
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32 #include <new>
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33
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34 #include "memory/allocation.inline.hpp"
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35 #include "utilities/decoder.hpp"
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36 #include "utilities/elfFile.hpp"
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37 #include "utilities/elfFuncDescTable.hpp"
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38 #include "utilities/elfStringTable.hpp"
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39 #include "utilities/elfSymbolTable.hpp"
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40
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41
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42 ElfFile::ElfFile(const char* filepath) {
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43 assert(filepath, "null file path");
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44 memset(&m_elfHdr, 0, sizeof(m_elfHdr));
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45 m_string_tables = NULL;
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46 m_symbol_tables = NULL;
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47 m_funcDesc_table = NULL;
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48 m_next = NULL;
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49 m_status = NullDecoder::no_error;
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50
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51 int len = strlen(filepath) + 1;
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52 m_filepath = (const char*)os::malloc(len * sizeof(char), mtInternal);
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53 if (m_filepath != NULL) {
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54 strcpy((char*)m_filepath, filepath);
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55 m_file = fopen(filepath, "r");
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56 if (m_file != NULL) {
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57 load_tables();
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58 } else {
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59 m_status = NullDecoder::file_not_found;
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60 }
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61 } else {
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62 m_status = NullDecoder::out_of_memory;
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63 }
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64 }
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65
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66 ElfFile::~ElfFile() {
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67 if (m_string_tables != NULL) {
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68 delete m_string_tables;
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69 }
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70
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71 if (m_symbol_tables != NULL) {
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72 delete m_symbol_tables;
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73 }
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74
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75 if (m_file != NULL) {
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76 fclose(m_file);
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77 }
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78
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79 if (m_filepath != NULL) {
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80 os::free((void*)m_filepath);
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81 }
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82
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83 if (m_next != NULL) {
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84 delete m_next;
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85 }
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86 };
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87
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88
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89 //Check elf header to ensure the file is valid.
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90 bool ElfFile::is_elf_file(Elf_Ehdr& hdr) {
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91 return (ELFMAG0 == hdr.e_ident[EI_MAG0] &&
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92 ELFMAG1 == hdr.e_ident[EI_MAG1] &&
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93 ELFMAG2 == hdr.e_ident[EI_MAG2] &&
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94 ELFMAG3 == hdr.e_ident[EI_MAG3] &&
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95 ELFCLASSNONE != hdr.e_ident[EI_CLASS] &&
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96 ELFDATANONE != hdr.e_ident[EI_DATA]);
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97 }
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98
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99 bool ElfFile::load_tables() {
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100 assert(m_file, "file not open");
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101 assert(!NullDecoder::is_error(m_status), "already in error");
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102
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103 // read elf file header
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104 if (fread(&m_elfHdr, sizeof(m_elfHdr), 1, m_file) != 1) {
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105 m_status = NullDecoder::file_invalid;
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106 return false;
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107 }
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108
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109 if (!is_elf_file(m_elfHdr)) {
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110 m_status = NullDecoder::file_invalid;
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111 return false;
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112 }
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113
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114 // walk elf file's section headers, and load string tables
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115 Elf_Shdr shdr;
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116 if (!fseek(m_file, m_elfHdr.e_shoff, SEEK_SET)) {
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117 if (NullDecoder::is_error(m_status)) return false;
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118
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119 for (int index = 0; index < m_elfHdr.e_shnum; index ++) {
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120 if (fread((void*)&shdr, sizeof(Elf_Shdr), 1, m_file) != 1) {
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121 m_status = NullDecoder::file_invalid;
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122 return false;
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123 }
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124 if (shdr.sh_type == SHT_STRTAB) {
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125 // string tables
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126 ElfStringTable* table = new (std::nothrow) ElfStringTable(m_file, shdr, index);
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127 if (table == NULL) {
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128 m_status = NullDecoder::out_of_memory;
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129 return false;
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130 }
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131 add_string_table(table);
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132 } else if (shdr.sh_type == SHT_SYMTAB || shdr.sh_type == SHT_DYNSYM) {
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133 // symbol tables
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134 ElfSymbolTable* table = new (std::nothrow) ElfSymbolTable(m_file, shdr);
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135 if (table == NULL) {
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136 m_status = NullDecoder::out_of_memory;
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137 return false;
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138 }
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139 add_symbol_table(table);
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140 }
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141 }
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142
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143 #if defined(PPC64)
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144 // Now read the .opd section wich contains the PPC64 function descriptor table.
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145 // The .opd section is only available on PPC64 (see for example:
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146 // http://refspecs.linuxfoundation.org/LSB_3.1.1/LSB-Core-PPC64/LSB-Core-PPC64/specialsections.html)
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147 // so this code should do no harm on other platforms but because of performance reasons we only
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148 // execute it on PPC64 platforms.
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149 // Notice that we can only find the .opd section after we have successfully read in the string
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150 // tables in the previous loop, because we need to query the name of each section which is
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151 // contained in one of the string tables (i.e. the one with the index m_elfHdr.e_shstrndx).
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152
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153 // Reset the file pointer
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154 if (fseek(m_file, m_elfHdr.e_shoff, SEEK_SET)) {
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155 m_status = NullDecoder::file_invalid;
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156 return false;
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157 }
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158 for (int index = 0; index < m_elfHdr.e_shnum; index ++) {
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159 if (fread((void*)&shdr, sizeof(Elf_Shdr), 1, m_file) != 1) {
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160 m_status = NullDecoder::file_invalid;
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161 return false;
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162 }
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163 if (m_elfHdr.e_shstrndx != SHN_UNDEF && shdr.sh_type == SHT_PROGBITS) {
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164 ElfStringTable* string_table = get_string_table(m_elfHdr.e_shstrndx);
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165 if (string_table == NULL) {
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166 m_status = NullDecoder::file_invalid;
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167 return false;
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168 }
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169 char buf[8]; // '8' is enough because we only want to read ".opd"
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170 if (string_table->string_at(shdr.sh_name, buf, sizeof(buf)) && !strncmp(".opd", buf, 4)) {
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171 m_funcDesc_table = new (std::nothrow) ElfFuncDescTable(m_file, shdr, index);
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172 if (m_funcDesc_table == NULL) {
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173 m_status = NullDecoder::out_of_memory;
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174 return false;
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175 }
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176 break;
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177 }
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178 }
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179 }
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180 #endif
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181
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182 }
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183 return true;
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184 }
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185
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186 bool ElfFile::decode(address addr, char* buf, int buflen, int* offset) {
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187 // something already went wrong, just give up
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188 if (NullDecoder::is_error(m_status)) {
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189 return false;
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190 }
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191 ElfSymbolTable* symbol_table = m_symbol_tables;
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192 int string_table_index;
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193 int pos_in_string_table;
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194 int off = INT_MAX;
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195 bool found_symbol = false;
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196 while (symbol_table != NULL) {
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197 if (symbol_table->lookup(addr, &string_table_index, &pos_in_string_table, &off, m_funcDesc_table)) {
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198 found_symbol = true;
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199 break;
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200 }
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201 symbol_table = symbol_table->m_next;
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202 }
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203 if (!found_symbol) return false;
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204
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205 ElfStringTable* string_table = get_string_table(string_table_index);
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206
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207 if (string_table == NULL) {
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208 m_status = NullDecoder::file_invalid;
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209 return false;
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210 }
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211 if (offset) *offset = off;
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212
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213 return string_table->string_at(pos_in_string_table, buf, buflen);
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214 }
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215
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216
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217 void ElfFile::add_symbol_table(ElfSymbolTable* table) {
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218 if (m_symbol_tables == NULL) {
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219 m_symbol_tables = table;
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220 } else {
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221 table->m_next = m_symbol_tables;
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222 m_symbol_tables = table;
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223 }
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224 }
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225
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226 void ElfFile::add_string_table(ElfStringTable* table) {
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227 if (m_string_tables == NULL) {
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228 m_string_tables = table;
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229 } else {
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230 table->m_next = m_string_tables;
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231 m_string_tables = table;
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232 }
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233 }
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234
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235 ElfStringTable* ElfFile::get_string_table(int index) {
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236 ElfStringTable* p = m_string_tables;
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237 while (p != NULL) {
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238 if (p->index() == index) return p;
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239 p = p->m_next;
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240 }
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241 return NULL;
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242 }
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243
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244 #ifdef LINUX
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245 bool ElfFile::specifies_noexecstack() {
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246 Elf_Phdr phdr;
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247 if (!m_file) return true;
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248
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249 if (!fseek(m_file, m_elfHdr.e_phoff, SEEK_SET)) {
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250 for (int index = 0; index < m_elfHdr.e_phnum; index ++) {
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251 if (fread((void*)&phdr, sizeof(Elf_Phdr), 1, m_file) != 1) {
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252 m_status = NullDecoder::file_invalid;
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253 return false;
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254 }
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255 if (phdr.p_type == PT_GNU_STACK) {
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256 if (phdr.p_flags == (PF_R | PF_W)) {
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257 return true;
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258 } else {
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259 return false;
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260 }
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261 }
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262 }
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263 }
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264 return false;
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265 }
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266 #endif
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267
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268 #endif // !_WINDOWS && !__APPLE__