1/*
2 * Copyright (C) 2016 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#include <elf.h>
18#include <errno.h>
19#include <inttypes.h>
20#include <signal.h>
21#include <stdint.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25#include <sys/ptrace.h>
26#include <sys/types.h>
27#include <unistd.h>
28
29#include <unwindstack/DexFiles.h>
30#include <unwindstack/Elf.h>
31#include <unwindstack/JitDebug.h>
32#include <unwindstack/Maps.h>
33#include <unwindstack/Memory.h>
34#include <unwindstack/Regs.h>
35#include <unwindstack/Unwinder.h>
36
37static bool Attach(pid_t pid) {
38  if (ptrace(PTRACE_ATTACH, pid, 0, 0) == -1) {
39    return false;
40  }
41
42  // Allow at least 1 second to attach properly.
43  for (size_t i = 0; i < 1000; i++) {
44    siginfo_t si;
45    if (ptrace(PTRACE_GETSIGINFO, pid, 0, &si) == 0) {
46      return true;
47    }
48    usleep(1000);
49  }
50  printf("%d: Failed to stop.\n", pid);
51  return false;
52}
53
54void DoUnwind(pid_t pid) {
55  unwindstack::RemoteMaps remote_maps(pid);
56  if (!remote_maps.Parse()) {
57    printf("Failed to parse map data.\n");
58    return;
59  }
60
61  unwindstack::Regs* regs = unwindstack::Regs::RemoteGet(pid);
62  if (regs == nullptr) {
63    printf("Unable to get remote reg data\n");
64    return;
65  }
66
67  printf("ABI: ");
68  switch (regs->Arch()) {
69    case unwindstack::ARCH_ARM:
70      printf("arm");
71      break;
72    case unwindstack::ARCH_X86:
73      printf("x86");
74      break;
75    case unwindstack::ARCH_ARM64:
76      printf("arm64");
77      break;
78    case unwindstack::ARCH_X86_64:
79      printf("x86_64");
80      break;
81    case unwindstack::ARCH_MIPS:
82      printf("mips");
83      break;
84    case unwindstack::ARCH_MIPS64:
85      printf("mips64");
86      break;
87    default:
88      printf("unknown\n");
89      return;
90  }
91  printf("\n");
92
93  auto process_memory = unwindstack::Memory::CreateProcessMemory(pid);
94  unwindstack::Unwinder unwinder(128, &remote_maps, regs, process_memory);
95
96  unwindstack::JitDebug jit_debug(process_memory);
97  unwinder.SetJitDebug(&jit_debug, regs->Arch());
98
99  unwindstack::DexFiles dex_files(process_memory);
100  unwinder.SetDexFiles(&dex_files, regs->Arch());
101
102  unwinder.Unwind();
103
104  // Print the frames.
105  for (size_t i = 0; i < unwinder.NumFrames(); i++) {
106    printf("%s\n", unwinder.FormatFrame(i).c_str());
107  }
108}
109
110int main(int argc, char** argv) {
111  if (argc != 2) {
112    printf("Usage: unwind <PID>\n");
113    return 1;
114  }
115
116  pid_t pid = atoi(argv[1]);
117  if (!Attach(pid)) {
118    printf("Failed to attach to pid %d: %s\n", pid, strerror(errno));
119    return 1;
120  }
121
122  DoUnwind(pid);
123
124  ptrace(PTRACE_DETACH, pid, 0, 0);
125
126  return 0;
127}
128