Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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 <errno.h> |
| 18 | #include <fcntl.h> |
| 19 | #include <inttypes.h> |
| 20 | #include <stdint.h> |
| 21 | #include <stdio.h> |
| 22 | #include <sys/mman.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <unistd.h> |
| 25 | |
| 26 | #include <android-base/unique_fd.h> |
| 27 | |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 28 | #include <cctype> |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 29 | #include <memory> |
| 30 | #include <string> |
| 31 | #include <vector> |
| 32 | |
Christopher Ferris | d226a51 | 2017-07-14 10:37:19 -0700 | [diff] [blame] | 33 | #include <unwindstack/Elf.h> |
| 34 | #include <unwindstack/Maps.h> |
| 35 | #include <unwindstack/Memory.h> |
| 36 | |
| 37 | namespace unwindstack { |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 38 | |
| 39 | MapInfo* Maps::Find(uint64_t pc) { |
| 40 | if (maps_.empty()) { |
| 41 | return nullptr; |
| 42 | } |
| 43 | size_t first = 0; |
| 44 | size_t last = maps_.size(); |
| 45 | while (first < last) { |
| 46 | size_t index = (first + last) / 2; |
| 47 | MapInfo* cur = &maps_[index]; |
| 48 | if (pc >= cur->start && pc < cur->end) { |
| 49 | return cur; |
| 50 | } else if (pc < cur->start) { |
| 51 | last = index; |
| 52 | } else { |
| 53 | first = index + 1; |
| 54 | } |
| 55 | } |
| 56 | return nullptr; |
| 57 | } |
| 58 | |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 59 | // Assumes that line does not end in '\n'. |
| 60 | static bool InternalParseLine(const char* line, MapInfo* map_info) { |
| 61 | // Do not use a sscanf implementation since it is not performant. |
| 62 | |
| 63 | // Example linux /proc/<pid>/maps lines: |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 64 | // 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 65 | char* str; |
| 66 | const char* old_str = line; |
| 67 | map_info->start = strtoul(old_str, &str, 16); |
| 68 | if (old_str == str || *str++ != '-') { |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 69 | return false; |
| 70 | } |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 71 | |
| 72 | old_str = str; |
| 73 | map_info->end = strtoul(old_str, &str, 16); |
| 74 | if (old_str == str || !std::isspace(*str++)) { |
| 75 | return false; |
| 76 | } |
| 77 | |
| 78 | while (std::isspace(*str)) { |
| 79 | str++; |
| 80 | } |
| 81 | |
| 82 | // Parse permissions data. |
| 83 | if (*str == '\0') { |
| 84 | return false; |
| 85 | } |
| 86 | map_info->flags = 0; |
| 87 | if (*str == 'r') { |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 88 | map_info->flags |= PROT_READ; |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 89 | } else if (*str != '-') { |
| 90 | return false; |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 91 | } |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 92 | str++; |
| 93 | if (*str == 'w') { |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 94 | map_info->flags |= PROT_WRITE; |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 95 | } else if (*str != '-') { |
| 96 | return false; |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 97 | } |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 98 | str++; |
| 99 | if (*str == 'x') { |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 100 | map_info->flags |= PROT_EXEC; |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 101 | } else if (*str != '-') { |
| 102 | return false; |
| 103 | } |
| 104 | str++; |
| 105 | if (*str != 'p' && *str != 's') { |
| 106 | return false; |
| 107 | } |
| 108 | str++; |
| 109 | |
| 110 | if (!std::isspace(*str++)) { |
| 111 | return false; |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 112 | } |
| 113 | |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 114 | old_str = str; |
| 115 | map_info->offset = strtoul(old_str, &str, 16); |
| 116 | if (old_str == str || !std::isspace(*str)) { |
| 117 | return false; |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 118 | } |
| 119 | |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 120 | // Ignore the 00:00 values. |
| 121 | old_str = str; |
| 122 | (void)strtoul(old_str, &str, 16); |
| 123 | if (old_str == str || *str++ != ':') { |
| 124 | return false; |
| 125 | } |
| 126 | if (std::isspace(*str)) { |
| 127 | return false; |
| 128 | } |
| 129 | |
| 130 | // Skip the inode. |
| 131 | old_str = str; |
| 132 | (void)strtoul(str, &str, 16); |
| 133 | if (old_str == str || !std::isspace(*str++)) { |
| 134 | return false; |
| 135 | } |
| 136 | |
| 137 | // Skip decimal digit. |
| 138 | old_str = str; |
| 139 | (void)strtoul(old_str, &str, 10); |
| 140 | if (old_str == str || (!std::isspace(*str) && *str != '\0')) { |
| 141 | return false; |
| 142 | } |
| 143 | |
| 144 | while (std::isspace(*str)) { |
| 145 | str++; |
| 146 | } |
| 147 | if (*str == '\0') { |
| 148 | map_info->name = str; |
| 149 | return true; |
| 150 | } |
| 151 | |
| 152 | // Save the name data. |
| 153 | map_info->name = str; |
| 154 | |
| 155 | // Mark a device map in /dev/ and not in /dev/ashmem/ specially. |
| 156 | if (map_info->name.substr(0, 5) == "/dev/" && map_info->name.substr(5, 7) != "ashmem/") { |
| 157 | map_info->flags |= MAPS_FLAGS_DEVICE_MAP; |
| 158 | } |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 159 | return true; |
| 160 | } |
| 161 | |
| 162 | bool Maps::Parse() { |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 163 | int fd = open(GetMapsFile().c_str(), O_RDONLY | O_CLOEXEC); |
| 164 | if (fd == -1) { |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 165 | return false; |
| 166 | } |
| 167 | |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 168 | bool return_value = true; |
| 169 | char buffer[2048]; |
| 170 | size_t leftover = 0; |
| 171 | while (true) { |
| 172 | ssize_t bytes = read(fd, &buffer[leftover], 2048 - leftover); |
| 173 | if (bytes == -1) { |
| 174 | return_value = false; |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 175 | break; |
| 176 | } |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 177 | if (bytes == 0) { |
| 178 | break; |
| 179 | } |
| 180 | bytes += leftover; |
| 181 | char* line = buffer; |
| 182 | while (bytes > 0) { |
| 183 | char* newline = static_cast<char*>(memchr(line, '\n', bytes)); |
| 184 | if (newline == nullptr) { |
| 185 | memmove(buffer, line, bytes); |
| 186 | break; |
| 187 | } |
| 188 | *newline = '\0'; |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 189 | |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 190 | MapInfo map_info; |
| 191 | if (!InternalParseLine(line, &map_info)) { |
| 192 | return_value = false; |
| 193 | break; |
| 194 | } |
| 195 | maps_.push_back(map_info); |
| 196 | |
| 197 | bytes -= newline - line + 1; |
| 198 | line = newline + 1; |
| 199 | } |
| 200 | leftover = bytes; |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 201 | } |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 202 | close(fd); |
| 203 | return return_value; |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 204 | } |
| 205 | |
| 206 | Maps::~Maps() { |
| 207 | for (auto& map : maps_) { |
| 208 | delete map.elf; |
| 209 | map.elf = nullptr; |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | bool BufferMaps::Parse() { |
| 214 | const char* start_of_line = buffer_; |
| 215 | do { |
| 216 | std::string line; |
| 217 | const char* end_of_line = strchr(start_of_line, '\n'); |
| 218 | if (end_of_line == nullptr) { |
| 219 | line = start_of_line; |
| 220 | } else { |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 221 | line = std::string(start_of_line, end_of_line - start_of_line); |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 222 | end_of_line++; |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | MapInfo map_info; |
Christopher Ferris | 60521c7 | 2017-08-18 15:10:53 -0700 | [diff] [blame^] | 226 | if (!InternalParseLine(line.c_str(), &map_info)) { |
Christopher Ferris | 09385e7 | 2017-04-05 13:25:04 -0700 | [diff] [blame] | 227 | return false; |
| 228 | } |
| 229 | maps_.push_back(map_info); |
| 230 | |
| 231 | start_of_line = end_of_line; |
| 232 | } while (start_of_line != nullptr && *start_of_line != '\0'); |
| 233 | return true; |
| 234 | } |
| 235 | |
| 236 | const std::string RemoteMaps::GetMapsFile() const { |
| 237 | return "/proc/" + std::to_string(pid_) + "/maps"; |
| 238 | } |
| 239 | |
| 240 | bool OfflineMaps::Parse() { |
| 241 | // Format of maps information: |
| 242 | // <uint64_t> StartOffset |
| 243 | // <uint64_t> EndOffset |
| 244 | // <uint64_t> offset |
| 245 | // <uint16_t> flags |
| 246 | // <uint16_t> MapNameLength |
| 247 | // <VariableLengthValue> MapName |
| 248 | android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(file_.c_str(), O_RDONLY))); |
| 249 | if (fd == -1) { |
| 250 | return false; |
| 251 | } |
| 252 | |
| 253 | std::vector<char> name; |
| 254 | while (true) { |
| 255 | MapInfo map_info; |
| 256 | ssize_t bytes = TEMP_FAILURE_RETRY(read(fd, &map_info.start, sizeof(map_info.start))); |
| 257 | if (bytes == 0) { |
| 258 | break; |
| 259 | } |
| 260 | if (bytes == -1 || bytes != sizeof(map_info.start)) { |
| 261 | return false; |
| 262 | } |
| 263 | bytes = TEMP_FAILURE_RETRY(read(fd, &map_info.end, sizeof(map_info.end))); |
| 264 | if (bytes == -1 || bytes != sizeof(map_info.end)) { |
| 265 | return false; |
| 266 | } |
| 267 | bytes = TEMP_FAILURE_RETRY(read(fd, &map_info.offset, sizeof(map_info.offset))); |
| 268 | if (bytes == -1 || bytes != sizeof(map_info.offset)) { |
| 269 | return false; |
| 270 | } |
| 271 | bytes = TEMP_FAILURE_RETRY(read(fd, &map_info.flags, sizeof(map_info.flags))); |
| 272 | if (bytes == -1 || bytes != sizeof(map_info.flags)) { |
| 273 | return false; |
| 274 | } |
| 275 | uint16_t len; |
| 276 | bytes = TEMP_FAILURE_RETRY(read(fd, &len, sizeof(len))); |
| 277 | if (bytes == -1 || bytes != sizeof(len)) { |
| 278 | return false; |
| 279 | } |
| 280 | if (len > 0) { |
| 281 | name.resize(len); |
| 282 | bytes = TEMP_FAILURE_RETRY(read(fd, name.data(), len)); |
| 283 | if (bytes == -1 || bytes != len) { |
| 284 | return false; |
| 285 | } |
| 286 | map_info.name = std::string(name.data(), len); |
| 287 | } |
| 288 | maps_.push_back(map_info); |
| 289 | } |
| 290 | return true; |
| 291 | } |
Christopher Ferris | d226a51 | 2017-07-14 10:37:19 -0700 | [diff] [blame] | 292 | |
| 293 | } // namespace unwindstack |