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1 /*
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8058
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2 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
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3960
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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 "libproc_impl.h"
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25
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26 static const char* alt_root = NULL;
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27 static int alt_root_len = -1;
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28
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29 #define SA_ALTROOT "SA_ALTROOT"
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30
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8750
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31 off_t ltell(int fd) {
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32 return lseek(fd, 0, SEEK_CUR);
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33 }
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34
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35 static void init_alt_root() {
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36 if (alt_root_len == -1) {
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37 alt_root = getenv(SA_ALTROOT);
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38 if (alt_root) {
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39 alt_root_len = strlen(alt_root);
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40 } else {
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41 alt_root_len = 0;
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42 }
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43 }
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44 }
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45
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46 int pathmap_open(const char* name) {
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47 int fd;
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48 char alt_path[PATH_MAX + 1];
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49
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50 init_alt_root();
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51
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52 if (alt_root_len > 0) {
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53 strcpy(alt_path, alt_root);
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54 strcat(alt_path, name);
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55 fd = open(alt_path, O_RDONLY);
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56 if (fd >= 0) {
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57 print_debug("path %s substituted for %s\n", alt_path, name);
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58 return fd;
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59 }
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60
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61 if (strrchr(name, '/')) {
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62 strcpy(alt_path, alt_root);
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63 strcat(alt_path, strrchr(name, '/'));
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64 fd = open(alt_path, O_RDONLY);
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65 if (fd >= 0) {
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66 print_debug("path %s substituted for %s\n", alt_path, name);
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67 return fd;
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68 }
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69 }
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70 } else {
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71 fd = open(name, O_RDONLY);
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72 if (fd >= 0) {
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73 return fd;
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74 }
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75 }
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76 return -1;
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77 }
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78
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79 static bool _libsaproc_debug;
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80
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81 void print_debug(const char* format,...) {
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82 if (_libsaproc_debug) {
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83 va_list alist;
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84
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85 va_start(alist, format);
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86 fputs("libsaproc DEBUG: ", stderr);
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87 vfprintf(stderr, format, alist);
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88 va_end(alist);
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89 }
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90 }
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91
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92 void print_error(const char* format,...) {
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93 va_list alist;
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94 va_start(alist, format);
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95 fputs("ERROR: ", stderr);
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96 vfprintf(stderr, format, alist);
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97 va_end(alist);
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98 }
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99
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100 bool is_debug() {
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101 return _libsaproc_debug;
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102 }
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103
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104 #ifdef __APPLE__
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105 // get arch offset in file
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106 bool get_arch_off(int fd, cpu_type_t cputype, off_t *offset) {
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107 struct fat_header fatheader;
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108 struct fat_arch fatarch;
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109 off_t img_start = 0;
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110
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111 off_t pos = ltell(fd);
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112 if (read(fd, (void *)&fatheader, sizeof(struct fat_header)) != sizeof(struct fat_header)) {
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113 return false;
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114 }
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115 if (fatheader.magic == FAT_CIGAM) {
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116 int i;
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117 for (i = 0; i < ntohl(fatheader.nfat_arch); i++) {
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118 if (read(fd, (void *)&fatarch, sizeof(struct fat_arch)) != sizeof(struct fat_arch)) {
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119 return false;
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120 }
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121 if (ntohl(fatarch.cputype) == cputype) {
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122 print_debug("fat offset=%x\n", ntohl(fatarch.offset));
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123 img_start = ntohl(fatarch.offset);
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124 break;
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125 }
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126 }
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127 if (img_start == 0) {
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128 return false;
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129 }
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130 }
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131 lseek(fd, pos, SEEK_SET);
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132 *offset = img_start;
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133 return true;
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134 }
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135
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136 bool is_macho_file(int fd) {
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137 mach_header_64 fhdr;
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138 off_t x86_64_off;
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139
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140 if (fd < 0) {
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141 print_debug("Invalid file handle passed to is_macho_file\n");
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142 return false;
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143 }
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144
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145 off_t pos = ltell(fd);
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146 // check fat header
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147 if (!get_arch_off(fd, CPU_TYPE_X86_64, &x86_64_off)) {
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148 print_debug("failed to get fat header\n");
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149 return false;
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150 }
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151 lseek(fd, x86_64_off, SEEK_SET);
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152 if (read(fd, (void *)&fhdr, sizeof(mach_header_64)) != sizeof(mach_header_64)) {
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153 return false;
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154 }
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155 lseek(fd, pos, SEEK_SET); // restore
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156 print_debug("fhdr.magic %x\n", fhdr.magic);
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157 return (fhdr.magic == MH_MAGIC_64 || fhdr.magic == MH_CIGAM_64);
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158 }
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159
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160 #endif //__APPLE__
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161
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162 // initialize libproc
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163 bool init_libproc(bool debug) {
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164 _libsaproc_debug = debug;
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165 #ifndef __APPLE__
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166 // initialize the thread_db library
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167 if (td_init() != TD_OK) {
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168 print_debug("libthread_db's td_init failed\n");
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169 return false;
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170 }
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171 #endif // __APPLE__
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172 return true;
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173 }
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174
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175 void destroy_lib_info(struct ps_prochandle* ph) {
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176 lib_info* lib = ph->libs;
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177 while (lib) {
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178 lib_info* next = lib->next;
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179 if (lib->symtab) {
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180 destroy_symtab(lib->symtab);
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181 }
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182 free(lib);
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183 lib = next;
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184 }
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185 }
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186
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187 void destroy_thread_info(struct ps_prochandle* ph) {
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188 sa_thread_info* thr = ph->threads;
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189 while (thr) {
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190 sa_thread_info* n = thr->next;
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191 free(thr);
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192 thr = n;
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193 }
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194 }
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195
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196 // ps_prochandle cleanup
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197 void Prelease(struct ps_prochandle* ph) {
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198 // do the "derived class" clean-up first
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199 ph->ops->release(ph);
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200 destroy_lib_info(ph);
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201 destroy_thread_info(ph);
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202 free(ph);
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203 }
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204
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205 lib_info* add_lib_info(struct ps_prochandle* ph, const char* libname, uintptr_t base) {
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206 return add_lib_info_fd(ph, libname, -1, base);
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207 }
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208
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209 lib_info* add_lib_info_fd(struct ps_prochandle* ph, const char* libname, int fd, uintptr_t base) {
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210 lib_info* newlib;
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211 print_debug("add_lib_info_fd %s\n", libname);
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212
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213 if ( (newlib = (lib_info*) calloc(1, sizeof(struct lib_info))) == NULL) {
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214 print_debug("can't allocate memory for lib_info\n");
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215 return NULL;
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216 }
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217
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218 strncpy(newlib->name, libname, sizeof(newlib->name));
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219 newlib->base = base;
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220
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221 if (fd == -1) {
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222 if ( (newlib->fd = pathmap_open(newlib->name)) < 0) {
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223 print_debug("can't open shared object %s\n", newlib->name);
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224 free(newlib);
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225 return NULL;
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226 }
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227 } else {
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228 newlib->fd = fd;
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229 }
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230
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231 #ifdef __APPLE__
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232 // check whether we have got an Macho file.
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233 if (is_macho_file(newlib->fd) == false) {
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234 close(newlib->fd);
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235 free(newlib);
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236 print_debug("not a mach-o file\n");
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237 return NULL;
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238 }
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239 #else
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240 // check whether we have got an ELF file. /proc/<pid>/map
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241 // gives out all file mappings and not just shared objects
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242 if (is_elf_file(newlib->fd) == false) {
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243 close(newlib->fd);
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244 free(newlib);
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245 return NULL;
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246 }
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247 #endif // __APPLE__
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248
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249 newlib->symtab = build_symtab(newlib->fd);
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250 if (newlib->symtab == NULL) {
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251 print_debug("symbol table build failed for %s\n", newlib->name);
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252 } else {
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253 print_debug("built symbol table for %s\n", newlib->name);
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254 }
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255
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256 // even if symbol table building fails, we add the lib_info.
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257 // This is because we may need to read from the ELF file or MachO file for core file
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258 // address read functionality. lookup_symbol checks for NULL symtab.
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259 if (ph->libs) {
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260 ph->lib_tail->next = newlib;
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261 ph->lib_tail = newlib;
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262 } else {
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263 ph->libs = ph->lib_tail = newlib;
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264 }
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265 ph->num_libs++;
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266 return newlib;
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267 }
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268
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269 // lookup for a specific symbol
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270 uintptr_t lookup_symbol(struct ps_prochandle* ph, const char* object_name,
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271 const char* sym_name) {
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272 // ignore object_name. search in all libraries
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273 // FIXME: what should we do with object_name?? The library names are obtained
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274 // by parsing /proc/<pid>/maps, which may not be the same as object_name.
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275 // What we need is a utility to map object_name to real file name, something
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276 // dlopen() does by looking at LD_LIBRARY_PATH and /etc/ld.so.cache. For
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277 // now, we just ignore object_name and do a global search for the symbol.
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278
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279 lib_info* lib = ph->libs;
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280 while (lib) {
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281 if (lib->symtab) {
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282 uintptr_t res = search_symbol(lib->symtab, lib->base, sym_name, NULL);
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283 if (res) return res;
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284 }
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285 lib = lib->next;
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286 }
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287
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288 print_debug("lookup failed for symbol '%s' in obj '%s'\n",
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289 sym_name, object_name);
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290 return (uintptr_t) NULL;
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291 }
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292
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293 const char* symbol_for_pc(struct ps_prochandle* ph, uintptr_t addr, uintptr_t* poffset) {
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294 const char* res = NULL;
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295 lib_info* lib = ph->libs;
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296 while (lib) {
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297 if (lib->symtab && addr >= lib->base) {
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298 res = nearest_symbol(lib->symtab, addr - lib->base, poffset);
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299 if (res) return res;
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300 }
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301 lib = lib->next;
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302 }
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303 return NULL;
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304 }
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305
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306 // add a thread to ps_prochandle
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307 sa_thread_info* add_thread_info(struct ps_prochandle* ph, pthread_t pthread_id, lwpid_t lwp_id) {
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308 sa_thread_info* newthr;
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309 if ( (newthr = (sa_thread_info*) calloc(1, sizeof(sa_thread_info))) == NULL) {
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310 print_debug("can't allocate memory for thread_info\n");
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311 return NULL;
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312 }
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313
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314 // initialize thread info
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315 newthr->pthread_id = pthread_id;
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316 newthr->lwp_id = lwp_id;
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317
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318 // add new thread to the list
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319 newthr->next = ph->threads;
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320 ph->threads = newthr;
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321 ph->num_threads++;
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322 return newthr;
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3960
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323 }
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324
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8750
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325 #ifndef __APPLE__
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3960
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326 // struct used for client data from thread_db callback
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327 struct thread_db_client_data {
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328 struct ps_prochandle* ph;
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329 thread_info_callback callback;
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330 };
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331
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332 // callback function for libthread_db
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333 static int thread_db_callback(const td_thrhandle_t *th_p, void *data) {
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334 struct thread_db_client_data* ptr = (struct thread_db_client_data*) data;
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335 td_thrinfo_t ti;
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336 td_err_e err;
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337
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338 memset(&ti, 0, sizeof(ti));
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339 err = td_thr_get_info(th_p, &ti);
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340 if (err != TD_OK) {
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341 print_debug("libthread_db : td_thr_get_info failed, can't get thread info\n");
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342 return err;
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343 }
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344
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345 print_debug("thread_db : pthread %d (lwp %d)\n", ti.ti_tid, ti.ti_lid);
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346
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347 if (ptr->callback(ptr->ph, (pthread_t)ti.ti_tid, ti.ti_lid) != true)
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348 return TD_ERR;
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349
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350 return TD_OK;
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351 }
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352
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353 // read thread_info using libthread_db
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354 bool read_thread_info(struct ps_prochandle* ph, thread_info_callback cb) {
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355 struct thread_db_client_data mydata;
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356 td_thragent_t* thread_agent = NULL;
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357 if (td_ta_new(ph, &thread_agent) != TD_OK) {
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358 print_debug("can't create libthread_db agent\n");
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359 return false;
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360 }
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361
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362 mydata.ph = ph;
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363 mydata.callback = cb;
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364
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365 // we use libthread_db iterator to iterate thru list of threads.
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366 if (td_ta_thr_iter(thread_agent, thread_db_callback, &mydata,
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367 TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
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368 TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS) != TD_OK) {
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369 td_ta_delete(thread_agent);
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370 return false;
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371 }
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372
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373 // delete thread agent
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374 td_ta_delete(thread_agent);
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375 return true;
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376 }
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377
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8750
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378 #endif // __APPLE__
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3960
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379
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380 // get number of threads
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381 int get_num_threads(struct ps_prochandle* ph) {
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382 return ph->num_threads;
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383 }
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384
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385 // get lwp_id of n'th thread
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386 lwpid_t get_lwp_id(struct ps_prochandle* ph, int index) {
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8750
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387 int count = 0;
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388 sa_thread_info* thr = ph->threads;
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389 while (thr) {
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390 if (count == index) {
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391 return thr->lwp_id;
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392 }
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393 count++;
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394 thr = thr->next;
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395 }
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396 return 0;
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3960
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397 }
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398
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8750
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399 #ifdef __APPLE__
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400 // set lwp_id of n'th thread
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401 bool set_lwp_id(struct ps_prochandle* ph, int index, lwpid_t lwpid) {
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402 int count = 0;
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403 sa_thread_info* thr = ph->threads;
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404 while (thr) {
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405 if (count == index) {
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406 thr->lwp_id = lwpid;
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407 return true;
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408 }
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409 count++;
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410 thr = thr->next;
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411 }
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412 return false;
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413 }
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414
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415 // get regs of n-th thread, only used in fillThreads the first time called
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416 bool get_nth_lwp_regs(struct ps_prochandle* ph, int index, struct reg* regs) {
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417 int count = 0;
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418 sa_thread_info* thr = ph->threads;
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419 while (thr) {
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420 if (count == index) {
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421 break;
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422 }
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423 count++;
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424 thr = thr->next;
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425 }
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|
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426 if (thr != NULL) {
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427 memcpy(regs, &thr->regs, sizeof(struct reg));
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428 return true;
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429 }
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430 return false;
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|
|
431 }
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432
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|
|
433 #endif // __APPLE__
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|
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434
|
|
3960
|
435 // get regs for a given lwp
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|
|
436 bool get_lwp_regs(struct ps_prochandle* ph, lwpid_t lwp_id, struct reg* regs) {
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|
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437 return ph->ops->get_lwp_regs(ph, lwp_id, regs);
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|
|
438 }
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|
|
439
|
|
|
440 // get number of shared objects
|
|
|
441 int get_num_libs(struct ps_prochandle* ph) {
|
|
8750
|
442 return ph->num_libs;
|
|
3960
|
443 }
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|
|
444
|
|
|
445 // get name of n'th solib
|
|
|
446 const char* get_lib_name(struct ps_prochandle* ph, int index) {
|
|
8750
|
447 int count = 0;
|
|
|
448 lib_info* lib = ph->libs;
|
|
|
449 while (lib) {
|
|
|
450 if (count == index) {
|
|
|
451 return lib->name;
|
|
|
452 }
|
|
|
453 count++;
|
|
|
454 lib = lib->next;
|
|
|
455 }
|
|
|
456 return NULL;
|
|
3960
|
457 }
|
|
|
458
|
|
|
459 // get base address of a lib
|
|
|
460 uintptr_t get_lib_base(struct ps_prochandle* ph, int index) {
|
|
8750
|
461 int count = 0;
|
|
|
462 lib_info* lib = ph->libs;
|
|
|
463 while (lib) {
|
|
|
464 if (count == index) {
|
|
|
465 return lib->base;
|
|
|
466 }
|
|
|
467 count++;
|
|
|
468 lib = lib->next;
|
|
|
469 }
|
|
|
470 return (uintptr_t)NULL;
|
|
3960
|
471 }
|
|
|
472
|
|
|
473 bool find_lib(struct ps_prochandle* ph, const char *lib_name) {
|
|
|
474 lib_info *p = ph->libs;
|
|
|
475 while (p) {
|
|
|
476 if (strcmp(p->name, lib_name) == 0) {
|
|
|
477 return true;
|
|
|
478 }
|
|
|
479 p = p->next;
|
|
|
480 }
|
|
|
481 return false;
|
|
|
482 }
|
|
|
483
|
|
|
484 //--------------------------------------------------------------------------
|
|
|
485 // proc service functions
|
|
|
486
|
|
|
487 // ps_pglobal_lookup() looks up the symbol sym_name in the symbol table
|
|
|
488 // of the load object object_name in the target process identified by ph.
|
|
|
489 // It returns the symbol's value as an address in the target process in
|
|
|
490 // *sym_addr.
|
|
|
491
|
|
|
492 ps_err_e ps_pglobal_lookup(struct ps_prochandle *ph, const char *object_name,
|
|
|
493 const char *sym_name, psaddr_t *sym_addr) {
|
|
|
494 *sym_addr = (psaddr_t) lookup_symbol(ph, object_name, sym_name);
|
|
|
495 return (*sym_addr ? PS_OK : PS_NOSYM);
|
|
|
496 }
|
|
|
497
|
|
|
498 // read "size" bytes info "buf" from address "addr"
|
|
|
499 ps_err_e ps_pread(struct ps_prochandle *ph, psaddr_t addr,
|
|
|
500 void *buf, size_t size) {
|
|
|
501 return ph->ops->p_pread(ph, (uintptr_t) addr, buf, size)? PS_OK: PS_ERR;
|
|
|
502 }
|
|
|
503
|
|
|
504 // write "size" bytes of data to debuggee at address "addr"
|
|
|
505 ps_err_e ps_pwrite(struct ps_prochandle *ph, psaddr_t addr,
|
|
|
506 const void *buf, size_t size) {
|
|
|
507 return ph->ops->p_pwrite(ph, (uintptr_t)addr, buf, size)? PS_OK: PS_ERR;
|
|
|
508 }
|
|
|
509
|
|
|
510 // fill in ptrace_lwpinfo for lid
|
|
|
511 ps_err_e ps_linfo(struct ps_prochandle *ph, lwpid_t lwp_id, void *linfo) {
|
|
|
512 return ph->ops->get_lwp_info(ph, lwp_id, linfo)? PS_OK: PS_ERR;
|
|
|
513 }
|
|
|
514
|
|
|
515 // needed for when libthread_db is compiled with TD_DEBUG defined
|
|
|
516 void
|
|
|
517 ps_plog (const char *format, ...)
|
|
|
518 {
|
|
|
519 va_list alist;
|
|
|
520
|
|
|
521 va_start(alist, format);
|
|
|
522 vfprintf(stderr, format, alist);
|
|
|
523 va_end(alist);
|
|
|
524 }
|
|
|
525
|
|
8750
|
526 #ifndef __APPLE__
|
|
3960
|
527 // ------------------------------------------------------------------------
|
|
|
528 // Functions below this point are not yet implemented. They are here only
|
|
|
529 // to make the linker happy.
|
|
|
530
|
|
|
531 ps_err_e ps_lsetfpregs(struct ps_prochandle *ph, lwpid_t lid, const prfpregset_t *fpregs) {
|
|
|
532 print_debug("ps_lsetfpregs not implemented\n");
|
|
|
533 return PS_OK;
|
|
|
534 }
|
|
|
535
|
|
|
536 ps_err_e ps_lsetregs(struct ps_prochandle *ph, lwpid_t lid, const prgregset_t gregset) {
|
|
|
537 print_debug("ps_lsetregs not implemented\n");
|
|
|
538 return PS_OK;
|
|
|
539 }
|
|
|
540
|
|
|
541 ps_err_e ps_lgetfpregs(struct ps_prochandle *ph, lwpid_t lid, prfpregset_t *fpregs) {
|
|
|
542 print_debug("ps_lgetfpregs not implemented\n");
|
|
|
543 return PS_OK;
|
|
|
544 }
|
|
|
545
|
|
|
546 ps_err_e ps_lgetregs(struct ps_prochandle *ph, lwpid_t lid, prgregset_t gregset) {
|
|
|
547 print_debug("ps_lgetfpregs not implemented\n");
|
|
|
548 return PS_OK;
|
|
|
549 }
|
|
|
550
|
|
|
551 ps_err_e ps_lstop(struct ps_prochandle *ph, lwpid_t lid) {
|
|
|
552 print_debug("ps_lstop not implemented\n");
|
|
|
553 return PS_OK;
|
|
|
554 }
|
|
|
555
|
|
|
556 ps_err_e ps_pcontinue(struct ps_prochandle *ph) {
|
|
|
557 print_debug("ps_pcontinue not implemented\n");
|
|
|
558 return PS_OK;
|
|
|
559 }
|
|
8750
|
560 #endif // __APPLE__
|
