/* * Copyright (C) 2016 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include <elf.h> #include <errno.h> #include <inttypes.h> #include <signal.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/ptrace.h> #include <sys/types.h> #include <unistd.h> #include <unwindstack/DexFiles.h> #include <unwindstack/Elf.h> #include <unwindstack/JitDebug.h> #include <unwindstack/Maps.h> #include <unwindstack/Memory.h> #include <unwindstack/Regs.h> #include <unwindstack/Unwinder.h> static bool Attach(pid_t pid) { if (ptrace(PTRACE_ATTACH, pid, 0, 0) == -1) { return false; } // Allow at least 1 second to attach properly. for (size_t i = 0; i < 1000; i++) { siginfo_t si; if (ptrace(PTRACE_GETSIGINFO, pid, 0, &si) == 0) { return true; } usleep(1000); } printf("%d: Failed to stop.\n", pid); return false; } void DoUnwind(pid_t pid) { unwindstack::RemoteMaps remote_maps(pid); if (!remote_maps.Parse()) { printf("Failed to parse map data.\n"); return; } unwindstack::Regs* regs = unwindstack::Regs::RemoteGet(pid); if (regs == nullptr) { printf("Unable to get remote reg data\n"); return; } printf("ABI: "); switch (regs->Arch()) { case unwindstack::ARCH_ARM: printf("arm"); break; case unwindstack::ARCH_X86: printf("x86"); break; case unwindstack::ARCH_ARM64: printf("arm64"); break; case unwindstack::ARCH_X86_64: printf("x86_64"); break; case unwindstack::ARCH_MIPS: printf("mips"); break; case unwindstack::ARCH_MIPS64: printf("mips64"); break; default: printf("unknown\n"); return; } printf("\n"); auto process_memory = unwindstack::Memory::CreateProcessMemory(pid); unwindstack::Unwinder unwinder(128, &remote_maps, regs, process_memory); unwindstack::JitDebug jit_debug(process_memory); unwinder.SetJitDebug(&jit_debug, regs->Arch()); unwindstack::DexFiles dex_files(process_memory); unwinder.SetDexFiles(&dex_files, regs->Arch()); unwinder.Unwind(); // Print the frames. for (size_t i = 0; i < unwinder.NumFrames(); i++) { printf("%s\n", unwinder.FormatFrame(i).c_str()); } } int main(int argc, char** argv) { if (argc != 2) { printf("Usage: unwind <PID>\n"); return 1; } pid_t pid = atoi(argv[1]); if (!Attach(pid)) { printf("Failed to attach to pid %d: %s\n", pid, strerror(errno)); return 1; } DoUnwind(pid); ptrace(PTRACE_DETACH, pid, 0, 0); return 0; }