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annotate src/share/vm/utilities/elfFuncDescTable.hpp @ 21559:be896a1983c0

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recast all Graal native code as JVMCI code (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Thu, 28 May 2015 15:36:48 +0200
parents e7cbc95179c4
children
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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
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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7 * under the terms of the GNU General Public License version 2 only, as
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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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
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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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
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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21 * or visit www.oracle.com if you need additional information or have any
e7cbc95179c4 8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables
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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