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 <dirent.h>
22 #include <errno.h>
23 #include <inttypes.h>
24 #include <limits.h>
25 #include <stddef.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <sys/ptrace.h>
30 #include <sys/types.h>
31 #include <unistd.h>
32
33 #include <map>
34 #include <memory>
35 #include <string>
36
37 #include <android-base/strings.h>
38 #include <android-base/unique_fd.h>
39 #include <log/log.h>
40 #include <unwindstack/AndroidUnwinder.h>
41 #include <unwindstack/Unwinder.h>
42
43 #include "libdebuggerd/types.h"
44 #include "libdebuggerd/utility.h"
45 #include "util.h"
46
dump_process_header(log_t * log,pid_t pid,const std::vector<std::string> & command_line)47 static void dump_process_header(log_t* log, pid_t pid,
48 const std::vector<std::string>& command_line) {
49 _LOG(log, logtype::BACKTRACE, "\n\n----- pid %d at %s -----\n", pid, get_timestamp().c_str());
50
51 if (!command_line.empty()) {
52 _LOG(log, logtype::BACKTRACE, "Cmd line: %s\n", android::base::Join(command_line, " ").c_str());
53 }
54 _LOG(log, logtype::BACKTRACE, "ABI: '%s'\n", ABI_STRING);
55 }
56
dump_process_footer(log_t * log,pid_t pid)57 static void dump_process_footer(log_t* log, pid_t pid) {
58 _LOG(log, logtype::BACKTRACE, "\n----- end %d -----\n", pid);
59 }
60
dump_backtrace_thread(int output_fd,unwindstack::AndroidUnwinder * unwinder,const ThreadInfo & thread)61 void dump_backtrace_thread(int output_fd, unwindstack::AndroidUnwinder* unwinder,
62 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 unwindstack::AndroidUnwinderData data;
70 if (!unwinder->Unwind(thread.registers.get(), data)) {
71 _LOG(&log, logtype::THREAD, "Unwind failed: tid = %d: Error %s\n", thread.tid,
72 data.GetErrorString().c_str());
73 return;
74 }
75
76 log_backtrace(&log, unwinder, data, " ");
77 }
78
dump_backtrace(android::base::unique_fd output_fd,unwindstack::AndroidUnwinder * unwinder,const std::map<pid_t,ThreadInfo> & thread_info,pid_t target_thread)79 void dump_backtrace(android::base::unique_fd output_fd, unwindstack::AndroidUnwinder* unwinder,
80 const std::map<pid_t, ThreadInfo>& thread_info, pid_t target_thread) {
81 log_t log;
82 log.tfd = output_fd.get();
83 log.amfd_data = nullptr;
84
85 auto target = thread_info.find(target_thread);
86 if (target == thread_info.end()) {
87 ALOGE("failed to find target thread in thread info");
88 return;
89 }
90
91 dump_process_header(&log, target->second.pid, target->second.command_line);
92
93 dump_backtrace_thread(output_fd.get(), unwinder, target->second);
94 for (const auto& [tid, info] : thread_info) {
95 if (tid != target_thread) {
96 dump_backtrace_thread(output_fd.get(), unwinder, info);
97 }
98 }
99
100 dump_process_footer(&log, target->second.pid);
101 }
102
dump_backtrace_header(int output_fd)103 void dump_backtrace_header(int output_fd) {
104 log_t log;
105 log.tfd = output_fd;
106 log.amfd_data = nullptr;
107
108 pid_t pid = getpid();
109 dump_process_header(&log, pid, get_command_line(pid));
110 }
111
dump_backtrace_footer(int output_fd)112 void dump_backtrace_footer(int output_fd) {
113 log_t log;
114 log.tfd = output_fd;
115 log.amfd_data = nullptr;
116
117 dump_process_footer(&log, getpid());
118 }
119