4803
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1 /*
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2 * Copyright (c) 2011, 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 #ifdef __APPLE__
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28 #include "decoder_machO.hpp"
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6258
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29
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30 #include <cxxabi.h>
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31 #include <mach-o/loader.h>
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32 #include <mach-o/nlist.h>
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33
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34
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35 bool MachODecoder::demangle(const char* symbol, char *buf, int buflen) {
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36 int status;
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37 char* result;
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38 size_t size = (size_t)buflen;
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39 // Don't pass buf to __cxa_demangle. In case of the 'buf' is too small,
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40 // __cxa_demangle will call system "realloc" for additional memory, which
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41 // may use different malloc/realloc mechanism that allocates 'buf'.
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42 if ((result = abi::__cxa_demangle(symbol, NULL, NULL, &status)) != NULL) {
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43 jio_snprintf(buf, buflen, "%s", result);
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44 // call c library's free
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45 ::free(result);
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46 return true;
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47 }
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48 return false;
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49 }
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50
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51 bool MachODecoder::decode(address addr, char *buf,
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52 int buflen, int *offset, const void *mach_base) {
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53 struct symtab_command * symt = (struct symtab_command *)
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54 mach_find_command((struct mach_header_64 *)mach_base, LC_SYMTAB);
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55 if (symt == NULL) {
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56 DEBUG_ONLY(tty->print_cr("no symtab in mach file at 0x%lx", mach_base));
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57 return false;
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58 }
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59 uint32_t off = symt->symoff; /* symbol table offset (within this mach file) */
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60 uint32_t nsyms = symt->nsyms; /* number of symbol table entries */
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61 uint32_t stroff = symt->stroff; /* string table offset */
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62 uint32_t strsize = symt->strsize; /* string table size in bytes */
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63
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64 // iterate through symbol table trying to match our offset
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65
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66 uint32_t addr_relative = (uintptr_t) mach_base - (uintptr_t) addr; // offset we seek in the symtab
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67 void * symtab_addr = (void*) ((uintptr_t) mach_base + off);
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68 struct nlist_64 *cur_nlist = (struct nlist_64 *) symtab_addr;
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69 struct nlist_64 *last_nlist = cur_nlist; // no size stored in an entry, so keep previously seen nlist
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70
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71 int32_t found_strx = 0;
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72 int32_t found_symval = 0;
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73
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74 for (uint32_t i=0; i < nsyms; i++) {
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75 uint32_t this_value = cur_nlist->n_value;
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76
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77 if (addr_relative == this_value) {
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78 found_strx = cur_nlist->n_un.n_strx;
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79 found_symval = this_value;
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80 break;
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81 } else if (addr_relative > this_value) {
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82 // gone past it, use previously seen nlist:
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83 found_strx = last_nlist->n_un.n_strx;
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84 found_symval = last_nlist->n_value;
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85 break;
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86 }
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87 last_nlist = cur_nlist;
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88 cur_nlist = cur_nlist + sizeof(struct nlist_64);
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89 }
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90 if (found_strx == 0) {
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91 return false;
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92 }
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93 // write the offset:
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94 *offset = addr_relative - found_symval;
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95
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96 // lookup found_strx in the string table
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97 char * symname = mach_find_in_stringtable((char*) ((uintptr_t)mach_base + stroff), strsize, found_strx);
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98 if (symname) {
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99 strncpy(buf, symname, buflen);
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100 return true;
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101 }
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102 DEBUG_ONLY(tty->print_cr("no string or null string found."));
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103 return false;
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104 }
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105
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106 void* MachODecoder::mach_find_command(struct mach_header_64 * mach_base, uint32_t command_wanted) {
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107 // possibly verify it is a mach_header, use magic number.
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108 // commands begin immediately after the header.
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109 struct load_command *pos = (struct load_command *) mach_base + sizeof(struct mach_header_64);
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110 for (uint32_t i = 0; i < mach_base->ncmds; i++) {
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111 struct load_command *this_cmd = (struct load_command *) pos;
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112 if (this_cmd->cmd == command_wanted) {
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113 return pos;
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114 }
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115 int cmdsize = this_cmd->cmdsize;
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116 pos += cmdsize;
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117 }
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118 return NULL;
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119 }
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120
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121 char* MachODecoder::mach_find_in_stringtable(char *strtab, uint32_t tablesize, int strx_wanted) {
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122
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123 if (strx_wanted == 0) {
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124 return NULL;
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125 }
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126 char *strtab_end = strtab + tablesize;
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127
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128 // find the first string, skip over the space char
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129 // (or the four zero bytes we see e.g. in libclient)
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130 if (*strtab == ' ') {
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131 strtab++;
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132 if (*strtab != 0) {
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133 DEBUG_ONLY(tty->print_cr("string table has leading space but no following zero."));
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134 return NULL;
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135 }
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136 strtab++;
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137 } else {
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138 if ((uint32_t) *strtab != 0) {
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139 DEBUG_ONLY(tty->print_cr("string table without leading space or leading int of zero."));
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140 return NULL;
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141 }
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142 strtab+=4;
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143 }
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144 // read the real strings starting at index 1
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145 int cur_strx = 1;
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146 while (strtab < strtab_end) {
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147 if (cur_strx == strx_wanted) {
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148 return strtab;
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149 }
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150 // find start of next string
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151 while (*strtab != 0) {
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152 strtab++;
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153 }
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154 strtab++; // skip the terminating zero
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155 cur_strx++;
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156 }
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157 DEBUG_ONLY(tty->print_cr("string number %d not found.", strx_wanted));
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158 return NULL;
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159 }
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160
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161
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4803
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162 #endif
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163
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164
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