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annotate src/share/vm/utilities/elfFuncDescTable.hpp @ 14649:f6301b007a16

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6498581: ThreadInterruptTest3 produces wrong output on Windows Summary: There is race condition between os::interrupt and os::is_interrupted on Windows. In JVM_Sleep(Thread.sleep), check if thread gets interrupted, it may see interrupted but not really interrupted so cause spurious waking up (early return from sleep). Fix by checking if interrupt event really gets set thus prevent false return. For intrinsic of _isInterrupted, on Windows, go fastpath only on bit not set. Reviewed-by: acorn, kvn Contributed-by: david.holmes@oracle.com, yumin.qi@oracle.com
author minqi
date Wed, 26 Feb 2014 15:20:41 -0800
parents e7cbc95179c4
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
14441
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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 * Copyright 2012, 2013 SAP AG. All rights reserved.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 *
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24 */
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25
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26 #ifndef SHARE_VM_UTILITIES_ELF_FUNC_DESC_TABLE_HPP
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27 #define SHARE_VM_UTILITIES_ELF_FUNC_DESC_TABLE_HPP
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28
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29 #if !defined(_WINDOWS) && !defined(__APPLE__)
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30
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31
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32 #include "memory/allocation.hpp"
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33 #include "utilities/decoder.hpp"
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34 #include "utilities/elfFile.hpp"
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35
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36 /*
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37
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38 On PowerPC-64 (and other architectures like for example IA64) a pointer to a
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39 function is not just a plain code address, but instead a pointer to a so called
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40 function descriptor (which is simply a structure containing 3 pointers).
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41 This fact is also reflected in the ELF ABI for PowerPC-64.
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42
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43 On architectures like x86 or SPARC, the ELF symbol table contains the start
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44 address and size of an object. So for example for a function object (i.e. type
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45 'STT_FUNC') the symbol table's 'st_value' and 'st_size' fields directly
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46 represent the starting address and size of that function. On PPC64 however, the
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47 symbol table's 'st_value' field only contains an index into another, PPC64
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48 specific '.opd' (official procedure descriptors) section, while the 'st_size'
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49 field still holds the size of the corresponding function. In order to get the
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50 actual start address of a function, it is necessary to read the corresponding
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51 function descriptor entry in the '.opd' section at the corresponding index and
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52 extract the start address from there.
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53
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54 That's exactly what this 'ElfFuncDescTable' class is used for. If the HotSpot
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55 runs on a PPC64 machine, and the corresponding ELF files contains an '.opd'
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56 section (which is actually mandatory on PPC64) it will be read into an object
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57 of type 'ElfFuncDescTable' just like the string and symbol table sections.
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58 Later on, during symbol lookup in 'ElfSymbolTable::lookup()' this function
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59 descriptor table will be used if available to find the real function address.
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60
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61 All this is how things work today (2013) on contemporary Linux distributions
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62 (i.e. SLES 10) and new version of GCC (i.e. > 4.0). However there is a history,
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63 and it goes like this:
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64
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65 In SLES 9 times (sometimes before GCC 3.4) gcc/ld on PPC64 generated two
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66 entries in the symbol table for every function. The value of the symbol with
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67 the name of the function was the address of the function descriptor while the
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68 dot '.' prefixed name was reserved to hold the actual address of that function
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69 (http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html#FUNC-DES).
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70
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71 For a C-function 'foo' this resulted in two symbol table entries like this
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72 (extracted from the output of 'readelf -a <lib.so>'):
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73
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74 Section Headers:
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75 [ 9] .text PROGBITS 0000000000000a20 00000a20
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76 00000000000005a0 0000000000000000 AX 0 0 16
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77 [21] .opd PROGBITS 00000000000113b8 000013b8
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78 0000000000000138 0000000000000000 WA 0 0 8
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79
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80 Symbol table '.symtab' contains 86 entries:
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81 Num: Value Size Type Bind Vis Ndx Name
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82 76: 00000000000114c0 24 FUNC GLOBAL DEFAULT 21 foo
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83 78: 0000000000000bb0 76 FUNC GLOBAL DEFAULT 9 .foo
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84
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85 You can see now that the '.foo' entry actually points into the '.text' segment
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86 ('Ndx'=9) and its value and size fields represent the functions actual address
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87 and size. On the other hand, the entry for plain 'foo' points into the '.opd'
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88 section ('Ndx'=21) and its value and size fields are the index into the '.opd'
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89 section and the size of the corresponding '.opd' section entry (3 pointers on
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90 PPC64).
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91
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92 These so called 'dot symbols' were dropped around gcc 3.4 from GCC and BINUTILS,
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93 see http://gcc.gnu.org/ml/gcc-patches/2004-08/msg00557.html.
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94 But nevertheless it may still be necessary to support both formats because we
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95 either run on an old system or because it is possible at any time that functions
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96 appear in the stack trace which come from old-style libraries.
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97
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98 Therefore we not only have to check for the presence of the function descriptor
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99 table during symbol lookup in 'ElfSymbolTable::lookup()'. We additionally have
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100 to check that the symbol table entry references the '.opd' section. Only in
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101 that case we can resolve the actual function address from there. Otherwise we
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102 use the plain 'st_value' field from the symbol table as function address. This
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103 way we can also lookup the symbols in old-style ELF libraries (although we get
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104 the 'dotted' versions in that case). However, if present, the 'dot' will be
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105 conditionally removed on PPC64 from the symbol in 'ElfDecoder::demangle()' in
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106 decoder_linux.cpp.
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107
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108 Notice that we can not reliably get the function address from old-style
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109 libraries because the 'st_value' field of the symbol table entries which point
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110 into the '.opd' section denote the size of the corresponding '.opd' entry and
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111 not that of the corresponding function. This has changed for the symbol table
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112 entries in new-style libraries as described at the beginning of this
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113 documentation.
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114
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115 */
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116
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117 class ElfFuncDescTable: public CHeapObj<mtInternal> {
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118 friend class ElfFile;
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119 public:
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120 ElfFuncDescTable(FILE* file, Elf_Shdr shdr, int index);
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121 ~ElfFuncDescTable();
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122
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123 // return the function address for the function descriptor at 'index' or NULL on error
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124 address lookup(Elf_Word index);
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125
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126 int get_index() { return m_index; };
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127
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128 NullDecoder::decoder_status get_status() { return m_status; };
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129
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130 protected:
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131 // holds the complete function descriptor section if
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132 // we can allocate enough memory
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133 address* m_funcDescs;
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134
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135 // file contains string table
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136 FILE* m_file;
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137
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138 // section header
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139 Elf_Shdr m_shdr;
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140
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141 // The section index of this function descriptor (i.e. '.opd') section in the ELF file
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142 int m_index;
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143
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144 NullDecoder::decoder_status m_status;
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145 };
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146
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147 #endif // !_WINDOWS && !__APPLE__
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148
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149 #endif // SHARE_VM_UTILITIES_ELF_FUNC_DESC_TABLE_HPP