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annotate src/share/vm/utilities/elfSymbolTable.cpp @ 14441:e7cbc95179c4

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8019929: PPC64 (part 107): Extend ELF-decoder to support PPC64 function descriptor tables Summary: Extend ELF-decoder to support PPC64 function descriptor tables Reviewed-by: kvn, zgu
author simonis
date Thu, 05 Dec 2013 19:19:09 +0100
parents b9a9ed0f8eeb
children 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
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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
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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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29 #include "memory/allocation.inline.hpp"
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30 #include "utilities/elfFuncDescTable.hpp"
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31 #include "utilities/elfSymbolTable.hpp"
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32
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33 ElfSymbolTable::ElfSymbolTable(FILE* file, Elf_Shdr shdr) {
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34 assert(file, "null file handle");
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35 m_symbols = NULL;
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36 m_next = NULL;
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37 m_file = file;
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38 m_status = NullDecoder::no_error;
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39
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40 // try to load the string table
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41 long cur_offset = ftell(file);
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42 if (cur_offset != -1) {
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43 // call malloc so we can back up if memory allocation fails.
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44 m_symbols = (Elf_Sym*)os::malloc(shdr.sh_size, mtInternal);
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45 if (m_symbols) {
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46 if (fseek(file, shdr.sh_offset, SEEK_SET) ||
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47 fread((void*)m_symbols, shdr.sh_size, 1, file) != 1 ||
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48 fseek(file, cur_offset, SEEK_SET)) {
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49 m_status = NullDecoder::file_invalid;
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50 os::free(m_symbols);
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51 m_symbols = NULL;
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52 }
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53 }
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54 if (!NullDecoder::is_error(m_status)) {
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55 memcpy(&m_shdr, &shdr, sizeof(Elf_Shdr));
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56 }
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57 } else {
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58 m_status = NullDecoder::file_invalid;
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59 }
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60 }
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61
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62 ElfSymbolTable::~ElfSymbolTable() {
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63 if (m_symbols != NULL) {
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64 os::free(m_symbols);
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65 }
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66
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67 if (m_next != NULL) {
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68 delete m_next;
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69 }
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70 }
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71
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72 bool ElfSymbolTable::lookup(address addr, int* stringtableIndex, int* posIndex, int* offset, ElfFuncDescTable* funcDescTable) {
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73 assert(stringtableIndex, "null string table index pointer");
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74 assert(posIndex, "null string table offset pointer");
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75 assert(offset, "null offset pointer");
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76
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77 if (NullDecoder::is_error(m_status)) {
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78 return false;
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79 }
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80
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81 size_t sym_size = sizeof(Elf_Sym);
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82 assert((m_shdr.sh_size % sym_size) == 0, "check size");
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83 int count = m_shdr.sh_size / sym_size;
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84 if (m_symbols != NULL) {
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85 for (int index = 0; index < count; index ++) {
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86 if (STT_FUNC == ELF_ST_TYPE(m_symbols[index].st_info)) {
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87 Elf_Word st_size = m_symbols[index].st_size;
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88 address sym_addr;
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89 if (funcDescTable != NULL && funcDescTable->get_index() == m_symbols[index].st_shndx) {
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90 // We need to go another step trough the function descriptor table (currently PPC64 only)
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91 sym_addr = funcDescTable->lookup(m_symbols[index].st_value);
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92 } else {
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93 sym_addr = (address)m_symbols[index].st_value;
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94 }
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95 if (sym_addr <= addr && (Elf_Word)(addr - sym_addr) < st_size) {
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96 *offset = (int)(addr - sym_addr);
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97 *posIndex = m_symbols[index].st_name;
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98 *stringtableIndex = m_shdr.sh_link;
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99 return true;
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100 }
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101 }
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102 }
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103 } else {
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104 long cur_pos;
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105 if ((cur_pos = ftell(m_file)) == -1 ||
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106 fseek(m_file, m_shdr.sh_offset, SEEK_SET)) {
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107 m_status = NullDecoder::file_invalid;
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108 return false;
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109 }
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110
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111 Elf_Sym sym;
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112 for (int index = 0; index < count; index ++) {
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113 if (fread(&sym, sym_size, 1, m_file) == 1) {
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114 if (STT_FUNC == ELF_ST_TYPE(sym.st_info)) {
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115 Elf_Word st_size = sym.st_size;
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116 address sym_addr;
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117 if (funcDescTable != NULL && funcDescTable->get_index() == sym.st_shndx) {
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118 // We need to go another step trough the function descriptor table (currently PPC64 only)
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119 sym_addr = funcDescTable->lookup(sym.st_value);
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120 } else {
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121 sym_addr = (address)sym.st_value;
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122 }
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123 if (sym_addr <= addr && (Elf_Word)(addr - sym_addr) < st_size) {
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124 *offset = (int)(addr - sym_addr);
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125 *posIndex = sym.st_name;
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126 *stringtableIndex = m_shdr.sh_link;
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127 return true;
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128 }
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129 }
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130 } else {
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131 m_status = NullDecoder::file_invalid;
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132 return false;
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133 }
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134 }
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135 fseek(m_file, cur_pos, SEEK_SET);
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136 }
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137 return true;
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138 }
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139
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140 #endif // !_WINDOWS && !__APPLE__