Yabin Cui | 323e945 | 2015-04-20 18:07:17 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "environment.h" |
| 18 | |
Yabin Cui | 5beebc8 | 2015-05-04 20:27:57 -0700 | [diff] [blame] | 19 | #include <inttypes.h> |
| 20 | #include <stdio.h> |
Yabin Cui | 323e945 | 2015-04-20 18:07:17 -0700 | [diff] [blame] | 21 | #include <stdlib.h> |
Yabin Cui | 5beebc8 | 2015-05-04 20:27:57 -0700 | [diff] [blame] | 22 | #include <unordered_map> |
Yabin Cui | 323e945 | 2015-04-20 18:07:17 -0700 | [diff] [blame] | 23 | #include <vector> |
| 24 | |
Yabin Cui | 5beebc8 | 2015-05-04 20:27:57 -0700 | [diff] [blame] | 25 | #include <base/file.h> |
Yabin Cui | 323e945 | 2015-04-20 18:07:17 -0700 | [diff] [blame] | 26 | #include <base/logging.h> |
Yabin Cui | 5beebc8 | 2015-05-04 20:27:57 -0700 | [diff] [blame] | 27 | #include <base/strings.h> |
| 28 | #include <base/stringprintf.h> |
Yabin Cui | 323e945 | 2015-04-20 18:07:17 -0700 | [diff] [blame] | 29 | |
Yabin Cui | 568b82a | 2015-05-05 19:58:07 -0700 | [diff] [blame] | 30 | #include "read_elf.h" |
Yabin Cui | 323e945 | 2015-04-20 18:07:17 -0700 | [diff] [blame] | 31 | #include "utils.h" |
| 32 | |
| 33 | std::vector<int> GetOnlineCpus() { |
| 34 | std::vector<int> result; |
| 35 | FILE* fp = fopen("/sys/devices/system/cpu/online", "re"); |
| 36 | if (fp == nullptr) { |
| 37 | PLOG(ERROR) << "can't open online cpu information"; |
| 38 | return result; |
| 39 | } |
| 40 | |
| 41 | LineReader reader(fp); |
| 42 | char* line; |
| 43 | if ((line = reader.ReadLine()) != nullptr) { |
| 44 | result = GetOnlineCpusFromString(line); |
| 45 | } |
| 46 | CHECK(!result.empty()) << "can't get online cpu information"; |
| 47 | return result; |
| 48 | } |
| 49 | |
| 50 | std::vector<int> GetOnlineCpusFromString(const std::string& s) { |
| 51 | std::vector<int> result; |
| 52 | bool have_dash = false; |
| 53 | const char* p = s.c_str(); |
| 54 | char* endp; |
| 55 | long cpu; |
| 56 | // Parse line like: 0,1-3, 5, 7-8 |
| 57 | while ((cpu = strtol(p, &endp, 10)) != 0 || endp != p) { |
| 58 | if (have_dash && result.size() > 0) { |
| 59 | for (int t = result.back() + 1; t < cpu; ++t) { |
| 60 | result.push_back(t); |
| 61 | } |
| 62 | } |
| 63 | have_dash = false; |
| 64 | result.push_back(cpu); |
| 65 | p = endp; |
| 66 | while (!isdigit(*p) && *p != '\0') { |
| 67 | if (*p == '-') { |
| 68 | have_dash = true; |
| 69 | } |
| 70 | ++p; |
| 71 | } |
| 72 | } |
| 73 | return result; |
| 74 | } |
Yabin Cui | 5beebc8 | 2015-05-04 20:27:57 -0700 | [diff] [blame] | 75 | |
| 76 | bool ProcessKernelSymbols(const std::string& symbol_file, |
| 77 | std::function<bool(const KernelSymbol&)> callback) { |
| 78 | FILE* fp = fopen(symbol_file.c_str(), "re"); |
| 79 | if (fp == nullptr) { |
| 80 | PLOG(ERROR) << "failed to open file " << symbol_file; |
| 81 | return false; |
| 82 | } |
| 83 | LineReader reader(fp); |
| 84 | char* line; |
| 85 | while ((line = reader.ReadLine()) != nullptr) { |
| 86 | // Parse line like: ffffffffa005c4e4 d __warned.41698 [libsas] |
| 87 | char name[reader.MaxLineSize()]; |
| 88 | char module[reader.MaxLineSize()]; |
| 89 | strcpy(module, ""); |
| 90 | |
| 91 | KernelSymbol symbol; |
| 92 | if (sscanf(line, "%" PRIx64 " %c %s%s", &symbol.addr, &symbol.type, name, module) < 3) { |
| 93 | continue; |
| 94 | } |
| 95 | symbol.name = name; |
| 96 | size_t module_len = strlen(module); |
| 97 | if (module_len > 2 && module[0] == '[' && module[module_len - 1] == ']') { |
| 98 | module[module_len - 1] = '\0'; |
| 99 | symbol.module = &module[1]; |
| 100 | } else { |
| 101 | symbol.module = nullptr; |
| 102 | } |
| 103 | |
| 104 | if (callback(symbol)) { |
| 105 | return true; |
| 106 | } |
| 107 | } |
| 108 | return false; |
| 109 | } |
| 110 | |
| 111 | static bool FindStartOfKernelSymbolCallback(const KernelSymbol& symbol, uint64_t* start_addr) { |
| 112 | if (symbol.module == nullptr) { |
| 113 | *start_addr = symbol.addr; |
| 114 | return true; |
| 115 | } |
| 116 | return false; |
| 117 | } |
| 118 | |
| 119 | static bool FindStartOfKernelSymbol(const std::string& symbol_file, uint64_t* start_addr) { |
| 120 | return ProcessKernelSymbols( |
| 121 | symbol_file, std::bind(&FindStartOfKernelSymbolCallback, std::placeholders::_1, start_addr)); |
| 122 | } |
| 123 | |
| 124 | static bool FindKernelFunctionSymbolCallback(const KernelSymbol& symbol, const std::string& name, |
| 125 | uint64_t* addr) { |
| 126 | if ((symbol.type == 'T' || symbol.type == 'W' || symbol.type == 'A') && |
| 127 | symbol.module == nullptr && name == symbol.name) { |
| 128 | *addr = symbol.addr; |
| 129 | return true; |
| 130 | } |
| 131 | return false; |
| 132 | } |
| 133 | |
| 134 | static bool FindKernelFunctionSymbol(const std::string& symbol_file, const std::string& name, |
| 135 | uint64_t* addr) { |
| 136 | return ProcessKernelSymbols( |
| 137 | symbol_file, std::bind(&FindKernelFunctionSymbolCallback, std::placeholders::_1, name, addr)); |
| 138 | } |
| 139 | |
| 140 | std::vector<ModuleMmap> GetLoadedModules() { |
| 141 | std::vector<ModuleMmap> result; |
| 142 | FILE* fp = fopen("/proc/modules", "re"); |
| 143 | if (fp == nullptr) { |
| 144 | // There is no /proc/modules on Android devices, so we don't print error if failed to open it. |
| 145 | PLOG(DEBUG) << "failed to open file /proc/modules"; |
| 146 | return result; |
| 147 | } |
| 148 | LineReader reader(fp); |
| 149 | char* line; |
| 150 | while ((line = reader.ReadLine()) != nullptr) { |
| 151 | // Parse line like: nf_defrag_ipv6 34768 1 nf_conntrack_ipv6, Live 0xffffffffa0fe5000 |
| 152 | char name[reader.MaxLineSize()]; |
| 153 | uint64_t addr; |
| 154 | if (sscanf(line, "%s%*lu%*u%*s%*s 0x%" PRIx64, name, &addr) == 2) { |
| 155 | ModuleMmap map; |
| 156 | map.name = name; |
| 157 | map.start_addr = addr; |
| 158 | result.push_back(map); |
| 159 | } |
| 160 | } |
| 161 | return result; |
| 162 | } |
| 163 | |
| 164 | static std::string GetLinuxVersion() { |
| 165 | std::string content; |
| 166 | if (android::base::ReadFileToString("/proc/version", &content)) { |
| 167 | char s[content.size() + 1]; |
| 168 | if (sscanf(content.c_str(), "Linux version %s", s) == 1) { |
| 169 | return s; |
| 170 | } |
| 171 | } |
| 172 | PLOG(FATAL) << "can't read linux version"; |
| 173 | return ""; |
| 174 | } |
| 175 | |
| 176 | static void GetAllModuleFiles(const std::string& path, |
| 177 | std::unordered_map<std::string, std::string>* module_file_map) { |
| 178 | std::vector<std::string> files; |
| 179 | std::vector<std::string> subdirs; |
| 180 | GetEntriesInDir(path, &files, &subdirs); |
| 181 | for (auto& name : files) { |
| 182 | if (android::base::EndsWith(name, ".ko")) { |
| 183 | std::string module_name = name.substr(0, name.size() - 3); |
| 184 | std::replace(module_name.begin(), module_name.end(), '-', '_'); |
| 185 | module_file_map->insert(std::make_pair(module_name, path + name)); |
| 186 | } |
| 187 | } |
| 188 | for (auto& name : subdirs) { |
| 189 | GetAllModuleFiles(path + "/" + name, module_file_map); |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | static std::vector<ModuleMmap> GetModulesInUse() { |
| 194 | // TODO: There is no /proc/modules or /lib/modules on Android, find methods work on it. |
| 195 | std::vector<ModuleMmap> module_mmaps = GetLoadedModules(); |
| 196 | std::string linux_version = GetLinuxVersion(); |
| 197 | std::string module_dirpath = "/lib/modules/" + linux_version + "/kernel"; |
| 198 | std::unordered_map<std::string, std::string> module_file_map; |
| 199 | GetAllModuleFiles(module_dirpath, &module_file_map); |
| 200 | for (auto& module : module_mmaps) { |
| 201 | auto it = module_file_map.find(module.name); |
| 202 | if (it != module_file_map.end()) { |
| 203 | module.filepath = it->second; |
| 204 | } |
| 205 | } |
| 206 | return module_mmaps; |
| 207 | } |
| 208 | |
| 209 | bool GetKernelAndModuleMmaps(KernelMmap* kernel_mmap, std::vector<ModuleMmap>* module_mmaps) { |
| 210 | if (!FindStartOfKernelSymbol("/proc/kallsyms", &kernel_mmap->start_addr)) { |
| 211 | LOG(DEBUG) << "call FindStartOfKernelSymbol() failed"; |
| 212 | return false; |
| 213 | } |
| 214 | if (!FindKernelFunctionSymbol("/proc/kallsyms", "_text", &kernel_mmap->pgoff)) { |
| 215 | LOG(DEBUG) << "call FindKernelFunctionSymbol() failed"; |
| 216 | return false; |
| 217 | } |
| 218 | kernel_mmap->name = DEFAULT_KERNEL_MMAP_NAME; |
| 219 | *module_mmaps = GetModulesInUse(); |
| 220 | if (module_mmaps->size() == 0) { |
| 221 | kernel_mmap->len = ULLONG_MAX - kernel_mmap->start_addr; |
| 222 | } else { |
| 223 | std::sort( |
| 224 | module_mmaps->begin(), module_mmaps->end(), |
| 225 | [](const ModuleMmap& m1, const ModuleMmap& m2) { return m1.start_addr < m2.start_addr; }); |
| 226 | CHECK_LE(kernel_mmap->start_addr, (*module_mmaps)[0].start_addr); |
| 227 | // When not having enough privilege, all addresses are read as 0. |
| 228 | if (kernel_mmap->start_addr == (*module_mmaps)[0].start_addr) { |
| 229 | kernel_mmap->len = 0; |
| 230 | } else { |
| 231 | kernel_mmap->len = (*module_mmaps)[0].start_addr - kernel_mmap->start_addr - 1; |
| 232 | } |
| 233 | for (size_t i = 0; i + 1 < module_mmaps->size(); ++i) { |
| 234 | if ((*module_mmaps)[i].start_addr == (*module_mmaps)[i + 1].start_addr) { |
| 235 | (*module_mmaps)[i].len = 0; |
| 236 | } else { |
| 237 | (*module_mmaps)[i].len = |
| 238 | (*module_mmaps)[i + 1].start_addr - (*module_mmaps)[i].start_addr - 1; |
| 239 | } |
| 240 | } |
| 241 | module_mmaps->back().len = ULLONG_MAX - module_mmaps->back().start_addr; |
| 242 | } |
| 243 | return true; |
| 244 | } |
| 245 | |
| 246 | static bool StringToPid(const std::string& s, pid_t* pid) { |
| 247 | char* endptr; |
| 248 | *pid = static_cast<pid_t>(strtol(s.c_str(), &endptr, 10)); |
| 249 | return *endptr == '\0'; |
| 250 | } |
| 251 | |
| 252 | static bool ReadThreadNameAndTgid(const std::string& status_file, std::string* comm, pid_t* tgid) { |
| 253 | FILE* fp = fopen(status_file.c_str(), "re"); |
| 254 | if (fp == nullptr) { |
| 255 | return false; |
| 256 | } |
| 257 | bool read_comm = false; |
| 258 | bool read_tgid = false; |
| 259 | LineReader reader(fp); |
| 260 | char* line; |
| 261 | while ((line = reader.ReadLine()) != nullptr) { |
| 262 | char s[reader.MaxLineSize()]; |
| 263 | if (sscanf(line, "Name:%s", s) == 1) { |
| 264 | *comm = s; |
| 265 | read_comm = true; |
| 266 | } else if (sscanf(line, "Tgid:%d", tgid) == 1) { |
| 267 | read_tgid = true; |
| 268 | } |
| 269 | if (read_comm && read_tgid) { |
| 270 | return true; |
| 271 | } |
| 272 | } |
| 273 | return false; |
| 274 | } |
| 275 | |
| 276 | static bool GetThreadComm(pid_t pid, std::vector<ThreadComm>* thread_comms) { |
| 277 | std::string task_dirname = android::base::StringPrintf("/proc/%d/task", pid); |
| 278 | std::vector<std::string> subdirs; |
| 279 | GetEntriesInDir(task_dirname, nullptr, &subdirs); |
| 280 | for (auto& name : subdirs) { |
| 281 | pid_t tid; |
| 282 | if (!StringToPid(name, &tid)) { |
| 283 | continue; |
| 284 | } |
| 285 | std::string status_file = task_dirname + "/" + name + "/status"; |
| 286 | std::string comm; |
| 287 | pid_t tgid; |
| 288 | if (!ReadThreadNameAndTgid(status_file, &comm, &tgid)) { |
| 289 | return false; |
| 290 | } |
| 291 | ThreadComm thread; |
| 292 | thread.tid = tid; |
| 293 | thread.tgid = tgid; |
| 294 | thread.comm = comm; |
| 295 | thread.is_process = (tid == pid); |
| 296 | thread_comms->push_back(thread); |
| 297 | } |
| 298 | return true; |
| 299 | } |
| 300 | |
| 301 | bool GetThreadComms(std::vector<ThreadComm>* thread_comms) { |
| 302 | thread_comms->clear(); |
| 303 | std::vector<std::string> subdirs; |
| 304 | GetEntriesInDir("/proc", nullptr, &subdirs); |
| 305 | for (auto& name : subdirs) { |
| 306 | pid_t pid; |
| 307 | if (!StringToPid(name, &pid)) { |
| 308 | continue; |
| 309 | } |
| 310 | if (!GetThreadComm(pid, thread_comms)) { |
| 311 | return false; |
| 312 | } |
| 313 | } |
| 314 | return true; |
| 315 | } |
| 316 | |
| 317 | bool GetThreadMmapsInProcess(pid_t pid, std::vector<ThreadMmap>* thread_mmaps) { |
| 318 | std::string map_file = android::base::StringPrintf("/proc/%d/maps", pid); |
| 319 | FILE* fp = fopen(map_file.c_str(), "re"); |
| 320 | if (fp == nullptr) { |
| 321 | PLOG(DEBUG) << "can't open file " << map_file; |
| 322 | return false; |
| 323 | } |
| 324 | thread_mmaps->clear(); |
| 325 | LineReader reader(fp); |
| 326 | char* line; |
| 327 | while ((line = reader.ReadLine()) != nullptr) { |
| 328 | // Parse line like: 00400000-00409000 r-xp 00000000 fc:00 426998 /usr/lib/gvfs/gvfsd-http |
| 329 | uint64_t start_addr, end_addr, pgoff; |
| 330 | char type[reader.MaxLineSize()]; |
| 331 | char execname[reader.MaxLineSize()]; |
| 332 | strcpy(execname, ""); |
| 333 | if (sscanf(line, "%" PRIx64 "-%" PRIx64 " %s %" PRIx64 " %*x:%*x %*u %s\n", &start_addr, |
| 334 | &end_addr, type, &pgoff, execname) < 4) { |
| 335 | continue; |
| 336 | } |
| 337 | if (strcmp(execname, "") == 0) { |
| 338 | strcpy(execname, DEFAULT_EXECNAME_FOR_THREAD_MMAP); |
| 339 | } |
| 340 | ThreadMmap thread; |
| 341 | thread.start_addr = start_addr; |
| 342 | thread.len = end_addr - start_addr; |
| 343 | thread.pgoff = pgoff; |
| 344 | thread.name = execname; |
| 345 | thread.executable = (type[2] == 'x'); |
| 346 | thread_mmaps->push_back(thread); |
| 347 | } |
| 348 | return true; |
| 349 | } |
Yabin Cui | 568b82a | 2015-05-05 19:58:07 -0700 | [diff] [blame] | 350 | |
| 351 | bool GetKernelBuildId(BuildId* build_id) { |
| 352 | return GetBuildIdFromNoteFile("/sys/kernel/notes", build_id); |
| 353 | } |
| 354 | |
| 355 | bool GetModuleBuildId(const std::string& module_name, BuildId* build_id) { |
| 356 | std::string notefile = "/sys/module/" + module_name + "/notes/.note.gnu.build-id"; |
| 357 | return GetBuildIdFromNoteFile(notefile, build_id); |
| 358 | } |