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
dump_process_header(log_t * log,pid_t pid,const char * process_name)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
dump_process_footer(log_t * log,pid_t pid)58 static void dump_process_footer(log_t* log, pid_t pid) {
59 _LOG(log, logtype::BACKTRACE, "\n----- end %d -----\n", pid);
60 }
61
dump_backtrace_thread(int output_fd,BacktraceMap * map,const ThreadInfo & thread)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
dump_backtrace(android::base::unique_fd output_fd,BacktraceMap * map,const std::map<pid_t,ThreadInfo> & thread_info,pid_t target_thread)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
dump_backtrace_header(int output_fd)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
dump_backtrace_footer(int output_fd)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