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3960
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1 /*
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2 * Copyright (c) 2003, 2010, 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 #include <stdarg.h>
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25 #include <stdio.h>
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26 #include <stdlib.h>
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27 #include <string.h>
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28 #include <fcntl.h>
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29 #include <thread_db.h>
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30 #include "libproc_impl.h"
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31
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32 static const char* alt_root = NULL;
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33 static int alt_root_len = -1;
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34
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35 #define SA_ALTROOT "SA_ALTROOT"
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36
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37 static void init_alt_root() {
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38 if (alt_root_len == -1) {
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39 alt_root = getenv(SA_ALTROOT);
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40 if (alt_root) {
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41 alt_root_len = strlen(alt_root);
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42 } else {
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43 alt_root_len = 0;
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44 }
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45 }
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46 }
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47
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48 int pathmap_open(const char* name) {
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49 int fd;
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50 char alt_path[PATH_MAX + 1];
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51
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52 init_alt_root();
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53 fd = open(name, O_RDONLY);
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54 if (fd >= 0) {
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55 return fd;
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56 }
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57
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58 if (alt_root_len > 0) {
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59 strcpy(alt_path, alt_root);
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60 strcat(alt_path, name);
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61 fd = open(alt_path, O_RDONLY);
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62 if (fd >= 0) {
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63 print_debug("path %s substituted for %s\n", alt_path, name);
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64 return fd;
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65 }
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66
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67 if (strrchr(name, '/')) {
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68 strcpy(alt_path, alt_root);
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69 strcat(alt_path, strrchr(name, '/'));
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70 fd = open(alt_path, O_RDONLY);
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71 if (fd >= 0) {
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72 print_debug("path %s substituted for %s\n", alt_path, name);
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73 return fd;
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74 }
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75 }
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76 }
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77
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78 return -1;
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79 }
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80
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81 static bool _libsaproc_debug;
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82
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83 void print_debug(const char* format,...) {
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84 if (_libsaproc_debug) {
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85 va_list alist;
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86
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87 va_start(alist, format);
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88 fputs("libsaproc DEBUG: ", stderr);
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89 vfprintf(stderr, format, alist);
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90 va_end(alist);
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91 }
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92 }
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93
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94 bool is_debug() {
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95 return _libsaproc_debug;
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96 }
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97
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98 // initialize libproc
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99 bool init_libproc(bool debug) {
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100 // init debug mode
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101 _libsaproc_debug = debug;
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102
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103 // initialize the thread_db library
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104 if (td_init() != TD_OK) {
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105 print_debug("libthread_db's td_init failed\n");
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106 return false;
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107 }
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108
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109 return true;
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110 }
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111
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112 static void destroy_lib_info(struct ps_prochandle* ph) {
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113 lib_info* lib = ph->libs;
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114 while (lib) {
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115 lib_info *next = lib->next;
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116 if (lib->symtab) {
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117 destroy_symtab(lib->symtab);
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118 }
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119 free(lib);
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120 lib = next;
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121 }
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122 }
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123
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124 static void destroy_thread_info(struct ps_prochandle* ph) {
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125 thread_info* thr = ph->threads;
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126 while (thr) {
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127 thread_info *next = thr->next;
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128 free(thr);
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129 thr = next;
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130 }
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131 }
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132
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133 // ps_prochandle cleanup
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134
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135 // ps_prochandle cleanup
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136 void Prelease(struct ps_prochandle* ph) {
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137 // do the "derived class" clean-up first
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138 ph->ops->release(ph);
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139 destroy_lib_info(ph);
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140 destroy_thread_info(ph);
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141 free(ph);
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142 }
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143
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144 lib_info* add_lib_info(struct ps_prochandle* ph, const char* libname, uintptr_t base) {
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145 return add_lib_info_fd(ph, libname, -1, base);
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146 }
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147
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148 lib_info* add_lib_info_fd(struct ps_prochandle* ph, const char* libname, int fd, uintptr_t base) {
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149 lib_info* newlib;
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150
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151 if ( (newlib = (lib_info*) calloc(1, sizeof(struct lib_info))) == NULL) {
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152 print_debug("can't allocate memory for lib_info\n");
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153 return NULL;
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154 }
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155
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156 strncpy(newlib->name, libname, sizeof(newlib->name));
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157 newlib->base = base;
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158
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159 if (fd == -1) {
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160 if ( (newlib->fd = pathmap_open(newlib->name)) < 0) {
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161 print_debug("can't open shared object %s\n", newlib->name);
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162 free(newlib);
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163 return NULL;
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164 }
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165 } else {
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166 newlib->fd = fd;
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167 }
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168
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169 // check whether we have got an ELF file. /proc/<pid>/map
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170 // gives out all file mappings and not just shared objects
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171 if (is_elf_file(newlib->fd) == false) {
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172 close(newlib->fd);
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173 free(newlib);
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174 return NULL;
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175 }
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176
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177 newlib->symtab = build_symtab(newlib->fd);
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178 if (newlib->symtab == NULL) {
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179 print_debug("symbol table build failed for %s\n", newlib->name);
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180 }
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181 else {
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182 print_debug("built symbol table for %s\n", newlib->name);
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183 }
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184
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185 // even if symbol table building fails, we add the lib_info.
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186 // This is because we may need to read from the ELF file for core file
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187 // address read functionality. lookup_symbol checks for NULL symtab.
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188 if (ph->libs) {
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189 ph->lib_tail->next = newlib;
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190 ph->lib_tail = newlib;
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191 } else {
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192 ph->libs = ph->lib_tail = newlib;
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193 }
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194 ph->num_libs++;
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195
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196 return newlib;
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197 }
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198
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199 // lookup for a specific symbol
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200 uintptr_t lookup_symbol(struct ps_prochandle* ph, const char* object_name,
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201 const char* sym_name) {
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202 // ignore object_name. search in all libraries
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203 // FIXME: what should we do with object_name?? The library names are obtained
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204 // by parsing /proc/<pid>/maps, which may not be the same as object_name.
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205 // What we need is a utility to map object_name to real file name, something
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206 // dlopen() does by looking at LD_LIBRARY_PATH and /etc/ld.so.cache. For
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207 // now, we just ignore object_name and do a global search for the symbol.
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208
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209 lib_info* lib = ph->libs;
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210 while (lib) {
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211 if (lib->symtab) {
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212 uintptr_t res = search_symbol(lib->symtab, lib->base, sym_name, NULL);
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213 if (res) return res;
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214 }
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215 lib = lib->next;
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216 }
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217
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218 print_debug("lookup failed for symbol '%s' in obj '%s'\n",
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219 sym_name, object_name);
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220 return (uintptr_t) NULL;
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221 }
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222
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223
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224 const char* symbol_for_pc(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* poffset) {
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225 const char* res = NULL;
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226 lib_info* lib = ph->libs;
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227 while (lib) {
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228 if (lib->symtab && addr >= lib->base) {
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229 res = nearest_symbol(lib->symtab, addr - lib->base, poffset);
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230 if (res) return res;
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231 }
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232 lib = lib->next;
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233 }
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234 return NULL;
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235 }
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236
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237 // add a thread to ps_prochandle
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238 thread_info* add_thread_info(struct ps_prochandle* ph, pthread_t pthread_id, lwpid_t lwp_id) {
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239 thread_info* newthr;
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240 if ( (newthr = (thread_info*) calloc(1, sizeof(thread_info))) == NULL) {
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241 print_debug("can't allocate memory for thread_info\n");
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242 return NULL;
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243 }
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244
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245 // initialize thread info
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246 newthr->pthread_id = pthread_id;
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247 newthr->lwp_id = lwp_id;
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248
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249 // add new thread to the list
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250 newthr->next = ph->threads;
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251 ph->threads = newthr;
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252 ph->num_threads++;
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253 return newthr;
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254 }
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255
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256
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257 // struct used for client data from thread_db callback
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258 struct thread_db_client_data {
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259 struct ps_prochandle* ph;
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260 thread_info_callback callback;
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261 };
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262
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263 // callback function for libthread_db
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264 static int thread_db_callback(const td_thrhandle_t *th_p, void *data) {
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265 struct thread_db_client_data* ptr = (struct thread_db_client_data*) data;
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266 td_thrinfo_t ti;
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267 td_err_e err;
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268
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269 memset(&ti, 0, sizeof(ti));
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270 err = td_thr_get_info(th_p, &ti);
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271 if (err != TD_OK) {
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272 print_debug("libthread_db : td_thr_get_info failed, can't get thread info\n");
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273 return err;
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274 }
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275
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276 print_debug("thread_db : pthread %d (lwp %d)\n", ti.ti_tid, ti.ti_lid);
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277
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278 if (ptr->callback(ptr->ph, (pthread_t)ti.ti_tid, ti.ti_lid) != true)
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279 return TD_ERR;
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280
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281 return TD_OK;
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282 }
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283
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284 // read thread_info using libthread_db
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285 bool read_thread_info(struct ps_prochandle* ph, thread_info_callback cb) {
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286 struct thread_db_client_data mydata;
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287 td_thragent_t* thread_agent = NULL;
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288 if (td_ta_new(ph, &thread_agent) != TD_OK) {
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289 print_debug("can't create libthread_db agent\n");
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290 return false;
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291 }
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292
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293 mydata.ph = ph;
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294 mydata.callback = cb;
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295
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296 // we use libthread_db iterator to iterate thru list of threads.
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297 if (td_ta_thr_iter(thread_agent, thread_db_callback, &mydata,
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298 TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
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299 TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS) != TD_OK) {
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300 td_ta_delete(thread_agent);
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301 return false;
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302 }
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303
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304 // delete thread agent
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305 td_ta_delete(thread_agent);
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306 return true;
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307 }
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308
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309
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310 // get number of threads
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311 int get_num_threads(struct ps_prochandle* ph) {
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312 return ph->num_threads;
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313 }
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314
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315 // get lwp_id of n'th thread
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316 lwpid_t get_lwp_id(struct ps_prochandle* ph, int index) {
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317 int count = 0;
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318 thread_info* thr = ph->threads;
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319 while (thr) {
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320 if (count == index) {
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321 return thr->lwp_id;
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322 }
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323 count++;
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324 thr = thr->next;
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325 }
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326 return -1;
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327 }
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328
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329 // get regs for a given lwp
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330 bool get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, struct reg* regs) {
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331 return ph->ops->get_lwp_regs(ph, lwp_id, regs);
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332 }
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333
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334 // get number of shared objects
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335 int get_num_libs(struct ps_prochandle* ph) {
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336 return ph->num_libs;
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337 }
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338
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339 // get name of n'th solib
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340 const char* get_lib_name(struct ps_prochandle* ph, int index) {
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341 int count = 0;
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342 lib_info* lib = ph->libs;
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343 while (lib) {
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344 if (count == index) {
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345 return lib->name;
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346 }
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347 count++;
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348 lib = lib->next;
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349 }
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350 return NULL;
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351 }
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352
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353 // get base address of a lib
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354 uintptr_t get_lib_base(struct ps_prochandle* ph, int index) {
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355 int count = 0;
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356 lib_info* lib = ph->libs;
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357 while (lib) {
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358 if (count == index) {
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359 return lib->base;
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360 }
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361 count++;
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362 lib = lib->next;
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363 }
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364 return (uintptr_t)NULL;
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365 }
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366
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367 bool find_lib(struct ps_prochandle* ph, const char *lib_name) {
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368 lib_info *p = ph->libs;
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369 while (p) {
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370 if (strcmp(p->name, lib_name) == 0) {
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371 return true;
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372 }
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373 p = p->next;
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374 }
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375 return false;
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376 }
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377
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378 //--------------------------------------------------------------------------
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379 // proc service functions
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380
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381 // ps_pglobal_lookup() looks up the symbol sym_name in the symbol table
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382 // of the load object object_name in the target process identified by ph.
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383 // It returns the symbol's value as an address in the target process in
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384 // *sym_addr.
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385
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386 ps_err_e ps_pglobal_lookup(struct ps_prochandle *ph, const char *object_name,
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387 const char *sym_name, psaddr_t *sym_addr) {
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388 *sym_addr = (psaddr_t) lookup_symbol(ph, object_name, sym_name);
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389 return (*sym_addr ? PS_OK : PS_NOSYM);
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390 }
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391
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392 // read "size" bytes info "buf" from address "addr"
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393 ps_err_e ps_pread(struct ps_prochandle *ph, psaddr_t addr,
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394 void *buf, size_t size) {
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395 return ph->ops->p_pread(ph, (uintptr_t) addr, buf, size)? PS_OK: PS_ERR;
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396 }
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397
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398 // write "size" bytes of data to debuggee at address "addr"
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399 ps_err_e ps_pwrite(struct ps_prochandle *ph, psaddr_t addr,
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400 const void *buf, size_t size) {
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401 return ph->ops->p_pwrite(ph, (uintptr_t)addr, buf, size)? PS_OK: PS_ERR;
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402 }
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403
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404 // fill in ptrace_lwpinfo for lid
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405 ps_err_e ps_linfo(struct ps_prochandle *ph, lwpid_t lwp_id, void *linfo) {
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406 return ph->ops->get_lwp_info(ph, lwp_id, linfo)? PS_OK: PS_ERR;
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407 }
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408
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409 // needed for when libthread_db is compiled with TD_DEBUG defined
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410 void
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411 ps_plog (const char *format, ...)
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412 {
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413 va_list alist;
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414
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415 va_start(alist, format);
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416 vfprintf(stderr, format, alist);
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417 va_end(alist);
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418 }
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419
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420 // ------------------------------------------------------------------------
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421 // Functions below this point are not yet implemented. They are here only
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422 // to make the linker happy.
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423
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424 ps_err_e ps_lsetfpregs(struct ps_prochandle *ph, lwpid_t lid, const prfpregset_t *fpregs) {
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425 print_debug("ps_lsetfpregs not implemented\n");
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426 return PS_OK;
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427 }
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428
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429 ps_err_e ps_lsetregs(struct ps_prochandle *ph, lwpid_t lid, const prgregset_t gregset) {
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430 print_debug("ps_lsetregs not implemented\n");
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431 return PS_OK;
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432 }
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433
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434 ps_err_e ps_lgetfpregs(struct ps_prochandle *ph, lwpid_t lid, prfpregset_t *fpregs) {
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435 print_debug("ps_lgetfpregs not implemented\n");
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436 return PS_OK;
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437 }
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438
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439 ps_err_e ps_lgetregs(struct ps_prochandle *ph, lwpid_t lid, prgregset_t gregset) {
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440 print_debug("ps_lgetfpregs not implemented\n");
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441 return PS_OK;
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442 }
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443
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444 ps_err_e ps_lstop(struct ps_prochandle *ph, lwpid_t lid) {
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445 print_debug("ps_lstop not implemented\n");
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446 return PS_OK;
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447 }
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448
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449 ps_err_e ps_pcontinue(struct ps_prochandle *ph) {
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450 print_debug("ps_pcontinue not implemented\n");
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451 return PS_OK;
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452 }
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