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/Unwinder.h>
41
42 #include "libdebuggerd/types.h"
43 #include "libdebuggerd/utility.h"
44 #include "util.h"
45
dump_process_header(log_t * log,pid_t pid,const std::vector<std::string> & command_line)46 static void dump_process_header(log_t* log, pid_t pid,
47 const std::vector<std::string>& command_line) {
48 _LOG(log, logtype::BACKTRACE, "\n\n----- pid %d at %s -----\n", pid, get_timestamp().c_str());
49
50 if (!command_line.empty()) {
51 _LOG(log, logtype::BACKTRACE, "Cmd line: %s\n", android::base::Join(command_line, " ").c_str());
52 }
53 _LOG(log, logtype::BACKTRACE, "ABI: '%s'\n", ABI_STRING);
54 }
55
dump_process_footer(log_t * log,pid_t pid)56 static void dump_process_footer(log_t* log, pid_t pid) {
57 _LOG(log, logtype::BACKTRACE, "\n----- end %d -----\n", pid);
58 }
59
dump_backtrace_thread(int output_fd,unwindstack::Unwinder * unwinder,const ThreadInfo & thread)60 void dump_backtrace_thread(int output_fd, unwindstack::Unwinder* unwinder,
61 const ThreadInfo& thread) {
62 log_t log;
63 log.tfd = output_fd;
64 log.amfd_data = nullptr;
65
66 _LOG(&log, logtype::BACKTRACE, "\n\"%s\" sysTid=%d\n", thread.thread_name.c_str(), thread.tid);
67
68 unwinder->SetRegs(thread.registers.get());
69 unwinder->Unwind();
70 if (unwinder->NumFrames() == 0) {
71 _LOG(&log, logtype::THREAD, "Unwind failed: tid = %d\n", thread.tid);
72 if (unwinder->LastErrorCode() != unwindstack::ERROR_NONE) {
73 _LOG(&log, logtype::THREAD, " Error code: %s\n", unwinder->LastErrorCodeString());
74 _LOG(&log, logtype::THREAD, " Error address: 0x%" PRIx64 "\n", unwinder->LastErrorAddress());
75 }
76 return;
77 }
78
79 log_backtrace(&log, unwinder, " ");
80 }
81
dump_backtrace(android::base::unique_fd output_fd,unwindstack::Unwinder * unwinder,const std::map<pid_t,ThreadInfo> & thread_info,pid_t target_thread)82 void dump_backtrace(android::base::unique_fd output_fd, unwindstack::Unwinder* unwinder,
83 const std::map<pid_t, ThreadInfo>& thread_info, pid_t target_thread) {
84 log_t log;
85 log.tfd = output_fd.get();
86 log.amfd_data = nullptr;
87
88 auto target = thread_info.find(target_thread);
89 if (target == thread_info.end()) {
90 ALOGE("failed to find target thread in thread info");
91 return;
92 }
93
94 dump_process_header(&log, target->second.pid, target->second.command_line);
95
96 dump_backtrace_thread(output_fd.get(), unwinder, target->second);
97 for (const auto& [tid, info] : thread_info) {
98 if (tid != target_thread) {
99 dump_backtrace_thread(output_fd.get(), unwinder, info);
100 }
101 }
102
103 dump_process_footer(&log, target->second.pid);
104 }
105
dump_backtrace_header(int output_fd)106 void dump_backtrace_header(int output_fd) {
107 log_t log;
108 log.tfd = output_fd;
109 log.amfd_data = nullptr;
110
111 pid_t pid = getpid();
112 dump_process_header(&log, pid, get_command_line(pid));
113 }
114
dump_backtrace_footer(int output_fd)115 void dump_backtrace_footer(int output_fd) {
116 log_t log;
117 log.tfd = output_fd;
118 log.amfd_data = nullptr;
119
120 dump_process_footer(&log, getpid());
121 }
122