Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2008, 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 | */ |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 16 | |
Brigid Smith | 62ba489 | 2014-06-10 11:53:08 -0700 | [diff] [blame] | 17 | #define LOG_TAG "DEBUG" |
| 18 | |
Pavel Chupin | c6c194c | 2013-11-21 23:17:20 +0400 | [diff] [blame] | 19 | #include "utility.h" |
| 20 | |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame] | 21 | #include <errno.h> |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame] | 22 | #include <signal.h> |
Pavel Chupin | c6c194c | 2013-11-21 23:17:20 +0400 | [diff] [blame] | 23 | #include <string.h> |
| 24 | #include <unistd.h> |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 25 | #include <sys/ptrace.h> |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame] | 26 | #include <sys/wait.h> |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 27 | |
Pavel Chupin | c6c194c | 2013-11-21 23:17:20 +0400 | [diff] [blame] | 28 | #include <backtrace/Backtrace.h> |
Elliott Hughes | b7cd09b | 2015-04-24 22:25:12 -0700 | [diff] [blame] | 29 | #include <base/file.h> |
Christopher Ferris | e8bc77e | 2015-05-22 14:26:13 -0700 | [diff] [blame] | 30 | #include <base/stringprintf.h> |
Mark Salyzyn | 99f47a9 | 2014-04-07 14:58:08 -0700 | [diff] [blame] | 31 | #include <log/log.h> |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 32 | |
Christopher Ferris | 1072f91 | 2014-10-31 21:34:38 -0700 | [diff] [blame] | 33 | const int SLEEP_TIME_USEC = 50000; // 0.05 seconds |
| 34 | const int MAX_TOTAL_SLEEP_USEC = 10000000; // 10 seconds |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 35 | |
Brigid Smith | 62ba489 | 2014-06-10 11:53:08 -0700 | [diff] [blame] | 36 | // Whitelist output desired in the logcat output. |
| 37 | bool is_allowed_in_logcat(enum logtype ltype) { |
| 38 | if ((ltype == ERROR) |
| 39 | || (ltype == HEADER) |
| 40 | || (ltype == REGISTERS) |
| 41 | || (ltype == BACKTRACE)) { |
| 42 | return true; |
| 43 | } |
| 44 | return false; |
| 45 | } |
| 46 | |
| 47 | void _LOG(log_t* log, enum logtype ltype, const char* fmt, ...) { |
Brigid Smith | 50eb546 | 2014-06-18 14:17:57 -0700 | [diff] [blame] | 48 | bool write_to_tombstone = (log->tfd != -1); |
| 49 | bool write_to_logcat = is_allowed_in_logcat(ltype) |
Brigid Smith | c75a02f | 2014-07-17 14:52:33 -0700 | [diff] [blame] | 50 | && log->crashed_tid != -1 |
| 51 | && log->current_tid != -1 |
Brigid Smith | 50eb546 | 2014-06-18 14:17:57 -0700 | [diff] [blame] | 52 | && (log->crashed_tid == log->current_tid); |
| 53 | bool write_to_activitymanager = (log->amfd != -1); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 54 | |
Pavel Chupin | c6c194c | 2013-11-21 23:17:20 +0400 | [diff] [blame] | 55 | char buf[512]; |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 56 | va_list ap; |
| 57 | va_start(ap, fmt); |
Pavel Chupin | c6c194c | 2013-11-21 23:17:20 +0400 | [diff] [blame] | 58 | vsnprintf(buf, sizeof(buf), fmt, ap); |
| 59 | va_end(ap); |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 60 | |
Pavel Chupin | c6c194c | 2013-11-21 23:17:20 +0400 | [diff] [blame] | 61 | size_t len = strlen(buf); |
| 62 | if (len <= 0) { |
| 63 | return; |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 64 | } |
| 65 | |
Brigid Smith | 62ba489 | 2014-06-10 11:53:08 -0700 | [diff] [blame] | 66 | if (write_to_tombstone) { |
Pavel Chupin | c6c194c | 2013-11-21 23:17:20 +0400 | [diff] [blame] | 67 | TEMP_FAILURE_RETRY(write(log->tfd, buf, len)); |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 68 | } |
| 69 | |
Brigid Smith | 62ba489 | 2014-06-10 11:53:08 -0700 | [diff] [blame] | 70 | if (write_to_logcat) { |
Christopher Ferris | b0412a5 | 2015-05-05 12:23:06 -0700 | [diff] [blame] | 71 | __android_log_buf_write(LOG_ID_CRASH, ANDROID_LOG_FATAL, LOG_TAG, buf); |
Brigid Smith | 62ba489 | 2014-06-10 11:53:08 -0700 | [diff] [blame] | 72 | if (write_to_activitymanager) { |
Elliott Hughes | b7cd09b | 2015-04-24 22:25:12 -0700 | [diff] [blame] | 73 | if (!android::base::WriteFully(log->amfd, buf, len)) { |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 74 | // timeout or other failure on write; stop informing the activity manager |
Elliott Hughes | b7cd09b | 2015-04-24 22:25:12 -0700 | [diff] [blame] | 75 | ALOGE("AM write failed: %s", strerror(errno)); |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 76 | log->amfd = -1; |
| 77 | } |
Christopher Tate | ded2e5a | 2013-03-19 13:12:23 -0700 | [diff] [blame] | 78 | } |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 79 | } |
The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 80 | } |
| 81 | |
Christopher Ferris | 1072f91 | 2014-10-31 21:34:38 -0700 | [diff] [blame] | 82 | int wait_for_sigstop(pid_t tid, int* total_sleep_time_usec, bool* detach_failed) { |
| 83 | bool allow_dead_tid = false; |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 84 | for (;;) { |
| 85 | int status; |
Christopher Ferris | 1072f91 | 2014-10-31 21:34:38 -0700 | [diff] [blame] | 86 | pid_t n = TEMP_FAILURE_RETRY(waitpid(tid, &status, __WALL | WNOHANG)); |
| 87 | if (n == -1) { |
| 88 | ALOGE("waitpid failed: tid %d, %s", tid, strerror(errno)); |
| 89 | break; |
| 90 | } else if (n == tid) { |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 91 | if (WIFSTOPPED(status)) { |
| 92 | return WSTOPSIG(status); |
| 93 | } else { |
Brigid Smith | 50eb546 | 2014-06-18 14:17:57 -0700 | [diff] [blame] | 94 | ALOGE("unexpected waitpid response: n=%d, status=%08x\n", n, status); |
Christopher Ferris | 1072f91 | 2014-10-31 21:34:38 -0700 | [diff] [blame] | 95 | // This is the only circumstance under which we can allow a detach |
| 96 | // to fail with ESRCH, which indicates the tid has exited. |
| 97 | allow_dead_tid = true; |
| 98 | break; |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 99 | } |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 100 | } |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 101 | |
Christopher Ferris | 1072f91 | 2014-10-31 21:34:38 -0700 | [diff] [blame] | 102 | if (*total_sleep_time_usec > MAX_TOTAL_SLEEP_USEC) { |
| 103 | ALOGE("timed out waiting for stop signal: tid=%d", tid); |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 104 | break; |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 105 | } |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 106 | |
Christopher Ferris | 1072f91 | 2014-10-31 21:34:38 -0700 | [diff] [blame] | 107 | usleep(SLEEP_TIME_USEC); |
| 108 | *total_sleep_time_usec += SLEEP_TIME_USEC; |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 109 | } |
Christopher Ferris | 1072f91 | 2014-10-31 21:34:38 -0700 | [diff] [blame] | 110 | |
| 111 | if (ptrace(PTRACE_DETACH, tid, 0, 0) != 0) { |
| 112 | if (allow_dead_tid && errno == ESRCH) { |
| 113 | ALOGE("tid exited before attach completed: tid %d", tid); |
| 114 | } else { |
| 115 | *detach_failed = true; |
| 116 | ALOGE("detach failed: tid %d, %s", tid, strerror(errno)); |
| 117 | } |
| 118 | } |
| 119 | return -1; |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 120 | } |
Kévin PETIT | 4bb4772 | 2013-12-18 16:44:24 +0000 | [diff] [blame] | 121 | |
Christopher Ferris | e8bc77e | 2015-05-22 14:26:13 -0700 | [diff] [blame] | 122 | #define MEMORY_BYTES_TO_DUMP 256 |
| 123 | #define MEMORY_BYTES_PER_LINE 16 |
Kévin PETIT | 4bb4772 | 2013-12-18 16:44:24 +0000 | [diff] [blame] | 124 | |
Christopher Ferris | e8bc77e | 2015-05-22 14:26:13 -0700 | [diff] [blame] | 125 | void dump_memory(log_t* log, Backtrace* backtrace, uintptr_t addr, const char* fmt, ...) { |
| 126 | std::string log_msg; |
| 127 | va_list ap; |
| 128 | va_start(ap, fmt); |
| 129 | android::base::StringAppendV(&log_msg, fmt, ap); |
| 130 | va_end(ap); |
Kévin PETIT | 4bb4772 | 2013-12-18 16:44:24 +0000 | [diff] [blame] | 131 | |
Christopher Ferris | e8bc77e | 2015-05-22 14:26:13 -0700 | [diff] [blame] | 132 | // Align the address to sizeof(long) and start 32 bytes before the address. |
| 133 | addr &= ~(sizeof(long) - 1); |
| 134 | if (addr >= 4128) { |
| 135 | addr -= 32; |
| 136 | } |
Kévin PETIT | 4bb4772 | 2013-12-18 16:44:24 +0000 | [diff] [blame] | 137 | |
Christopher Ferris | e8bc77e | 2015-05-22 14:26:13 -0700 | [diff] [blame] | 138 | // Don't bother if the address looks too low, or looks too high. |
| 139 | if (addr < 4096 || |
| 140 | #if defined(__LP64__) |
| 141 | addr > 0x4000000000000000UL - MEMORY_BYTES_TO_DUMP) { |
Kévin PETIT | 4bb4772 | 2013-12-18 16:44:24 +0000 | [diff] [blame] | 142 | #else |
Christopher Ferris | e8bc77e | 2015-05-22 14:26:13 -0700 | [diff] [blame] | 143 | addr > 0xffff0000 - MEMORY_BYTES_TO_DUMP) { |
Kévin PETIT | 4bb4772 | 2013-12-18 16:44:24 +0000 | [diff] [blame] | 144 | #endif |
Christopher Ferris | e8bc77e | 2015-05-22 14:26:13 -0700 | [diff] [blame] | 145 | return; |
| 146 | } |
Kévin PETIT | 4bb4772 | 2013-12-18 16:44:24 +0000 | [diff] [blame] | 147 | |
Christopher Ferris | e8bc77e | 2015-05-22 14:26:13 -0700 | [diff] [blame] | 148 | _LOG(log, logtype::MEMORY, "\n%s\n", log_msg.c_str()); |
| 149 | |
| 150 | // Dump 256 bytes |
| 151 | uintptr_t data[MEMORY_BYTES_TO_DUMP/sizeof(uintptr_t)]; |
| 152 | memset(data, 0, MEMORY_BYTES_TO_DUMP); |
| 153 | size_t bytes = backtrace->Read(addr, reinterpret_cast<uint8_t*>(data), sizeof(data)); |
| 154 | if (bytes % sizeof(uintptr_t) != 0) { |
| 155 | // This should never happen, but just in case. |
| 156 | ALOGE("Bytes read %zu, is not a multiple of %zu", bytes, sizeof(uintptr_t)); |
| 157 | bytes &= ~(sizeof(uintptr_t) - 1); |
| 158 | } |
| 159 | |
| 160 | if (bytes < MEMORY_BYTES_TO_DUMP && bytes > 0) { |
| 161 | // Try to do one more read. This could happen if a read crosses a map, but |
| 162 | // the maps do not have any break between them. Only requires one extra |
| 163 | // read because a map has to contain at least one page, and the total |
| 164 | // number of bytes to dump is smaller than a page. |
| 165 | size_t bytes2 = backtrace->Read(addr + bytes, reinterpret_cast<uint8_t*>(data) + bytes, |
| 166 | sizeof(data) - bytes); |
| 167 | bytes += bytes2; |
| 168 | if (bytes2 > 0 && bytes % sizeof(uintptr_t) != 0) { |
| 169 | // This should never happen, but we'll try and continue any way. |
| 170 | ALOGE("Bytes after second read %zu, is not a multiple of %zu", bytes, sizeof(uintptr_t)); |
| 171 | bytes &= ~(sizeof(uintptr_t) - 1); |
Kévin PETIT | 4bb4772 | 2013-12-18 16:44:24 +0000 | [diff] [blame] | 172 | } |
Christopher Ferris | e8bc77e | 2015-05-22 14:26:13 -0700 | [diff] [blame] | 173 | } |
| 174 | |
| 175 | // Dump the code around memory as: |
| 176 | // addr contents ascii |
| 177 | // 0000000000008d34 ef000000e8bd0090 e1b00000512fff1e ............../Q |
| 178 | // 0000000000008d44 ea00b1f9e92d0090 e3a070fcef000000 ......-..p...... |
| 179 | // On 32-bit machines, there are still 16 bytes per line but addresses and |
| 180 | // words are of course presented differently. |
| 181 | uintptr_t* data_ptr = data; |
| 182 | for (size_t line = 0; line < MEMORY_BYTES_TO_DUMP / MEMORY_BYTES_PER_LINE; line++) { |
| 183 | std::string logline; |
| 184 | android::base::StringAppendF(&logline, " %" PRIPTR, addr); |
| 185 | |
| 186 | addr += MEMORY_BYTES_PER_LINE; |
| 187 | std::string ascii; |
| 188 | for (size_t i = 0; i < MEMORY_BYTES_PER_LINE / sizeof(uintptr_t); i++, data_ptr++) { |
| 189 | if (bytes >= sizeof(uintptr_t)) { |
| 190 | bytes -= sizeof(uintptr_t); |
| 191 | android::base::StringAppendF(&logline, " %" PRIPTR, *data_ptr); |
| 192 | |
| 193 | // Fill out the ascii string from the data. |
| 194 | uint8_t* ptr = reinterpret_cast<uint8_t*>(data_ptr); |
| 195 | for (size_t val = 0; val < sizeof(uintptr_t); val++, ptr++) { |
| 196 | if (*ptr >= 0x20 && *ptr < 0x7f) { |
| 197 | ascii += *ptr; |
| 198 | } else { |
| 199 | ascii += '.'; |
| 200 | } |
| 201 | } |
| 202 | } else { |
| 203 | logline += ' ' + std::string(sizeof(uintptr_t) * 2, '-'); |
| 204 | ascii += std::string(sizeof(uintptr_t), '.'); |
| 205 | } |
| 206 | } |
| 207 | _LOG(log, logtype::MEMORY, "%s %s\n", logline.c_str(), ascii.c_str()); |
| 208 | } |
Kévin PETIT | 4bb4772 | 2013-12-18 16:44:24 +0000 | [diff] [blame] | 209 | } |