1 /* 2 * Copyright (C) 2012 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 #define LOG_TAG "DEBUG" 18 19 #include "libdebuggerd/backtrace.h" 20 21 #include <errno.h> 22 #include <dirent.h> 23 #include <limits.h> 24 #include <stddef.h> 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <string.h> 28 #include <sys/ptrace.h> 29 #include <sys/types.h> 30 #include <time.h> 31 #include <unistd.h> 32 33 #include <map> 34 #include <memory> 35 #include <string> 36 37 #include <android-base/unique_fd.h> 38 #include <backtrace/Backtrace.h> 39 #include <log/log.h> 40 41 #include "libdebuggerd/types.h" 42 #include "libdebuggerd/utility.h" 43 44 static void dump_process_header(log_t* log, pid_t pid, const char* process_name) { 45 time_t t = time(NULL); 46 struct tm tm; 47 localtime_r(&t, &tm); 48 char timestr[64]; 49 strftime(timestr, sizeof(timestr), "%F %T", &tm); 50 _LOG(log, logtype::BACKTRACE, "\n\n----- pid %d at %s -----\n", pid, timestr); 51 52 if (process_name) { 53 _LOG(log, logtype::BACKTRACE, "Cmd line: %s\n", process_name); 54 } 55 _LOG(log, logtype::BACKTRACE, "ABI: '%s'\n", ABI_STRING); 56 } 57 58 static void dump_process_footer(log_t* log, pid_t pid) { 59 _LOG(log, logtype::BACKTRACE, "\n----- end %d -----\n", pid); 60 } 61 62 void dump_backtrace_thread(int output_fd, BacktraceMap* map, const ThreadInfo& thread) { 63 log_t log; 64 log.tfd = output_fd; 65 log.amfd_data = nullptr; 66 67 _LOG(&log, logtype::BACKTRACE, "\n\"%s\" sysTid=%d\n", thread.thread_name.c_str(), thread.tid); 68 69 std::vector<backtrace_frame_data_t> frames; 70 if (!Backtrace::Unwind(thread.registers.get(), map, &frames, 0, nullptr)) { 71 _LOG(&log, logtype::THREAD, "Unwind failed: tid = %d", thread.tid); 72 return; 73 } 74 75 for (auto& frame : frames) { 76 _LOG(&log, logtype::BACKTRACE, " %s\n", Backtrace::FormatFrameData(&frame).c_str()); 77 } 78 } 79 80 void dump_backtrace(android::base::unique_fd output_fd, BacktraceMap* map, 81 const std::map<pid_t, ThreadInfo>& thread_info, pid_t target_thread) { 82 log_t log; 83 log.tfd = output_fd.get(); 84 log.amfd_data = nullptr; 85 86 auto target = thread_info.find(target_thread); 87 if (target == thread_info.end()) { 88 ALOGE("failed to find target thread in thread info"); 89 return; 90 } 91 92 dump_process_header(&log, target->second.pid, target->second.process_name.c_str()); 93 94 dump_backtrace_thread(output_fd.get(), map, target->second); 95 for (const auto& [tid, info] : thread_info) { 96 if (tid != target_thread) { 97 dump_backtrace_thread(output_fd.get(), map, info); 98 } 99 } 100 101 dump_process_footer(&log, target->second.pid); 102 } 103 104 void dump_backtrace_header(int output_fd) { 105 log_t log; 106 log.tfd = output_fd; 107 log.amfd_data = nullptr; 108 109 char process_name[128]; 110 read_with_default("/proc/self/cmdline", process_name, sizeof(process_name), "<unknown>"); 111 dump_process_header(&log, getpid(), process_name); 112 } 113 114 void dump_backtrace_footer(int output_fd) { 115 log_t log; 116 log.tfd = output_fd; 117 log.amfd_data = nullptr; 118 119 dump_process_footer(&log, getpid()); 120 } 121
