eb0772ff4a
This object is able to be easily used from other code and can be used to replace the libbacktrace calls in other parts of the platform. Also, demangle the function names when calling FormatFrame. Bug: 120606663 Test: Unit tests pass, debuggerd using this code directly passes unit Test: tests. Change-Id: Ifd8cf9bdd89174c1736810711d20e9f37f29b1bf
124 lines
2.9 KiB
C++
124 lines
2.9 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <elf.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <signal.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ptrace.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <unwindstack/DexFiles.h>
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#include <unwindstack/Elf.h>
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#include <unwindstack/JitDebug.h>
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#include <unwindstack/Maps.h>
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#include <unwindstack/Memory.h>
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#include <unwindstack/Regs.h>
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#include <unwindstack/Unwinder.h>
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static bool Attach(pid_t pid) {
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if (ptrace(PTRACE_SEIZE, pid, 0, 0) == -1) {
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return false;
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}
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if (ptrace(PTRACE_INTERRUPT, pid, 0, 0) == -1) {
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return false;
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}
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// Allow at least 1 second to attach properly.
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for (size_t i = 0; i < 1000; i++) {
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siginfo_t si;
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if (ptrace(PTRACE_GETSIGINFO, pid, 0, &si) == 0) {
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return true;
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}
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usleep(1000);
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}
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printf("%d: Failed to stop.\n", pid);
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return false;
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}
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void DoUnwind(pid_t pid) {
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unwindstack::Regs* regs = unwindstack::Regs::RemoteGet(pid);
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if (regs == nullptr) {
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printf("Unable to get remote reg data\n");
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return;
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}
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printf("ABI: ");
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switch (regs->Arch()) {
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case unwindstack::ARCH_ARM:
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printf("arm");
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break;
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case unwindstack::ARCH_X86:
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printf("x86");
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break;
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case unwindstack::ARCH_ARM64:
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printf("arm64");
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break;
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case unwindstack::ARCH_X86_64:
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printf("x86_64");
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break;
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case unwindstack::ARCH_MIPS:
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printf("mips");
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break;
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case unwindstack::ARCH_MIPS64:
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printf("mips64");
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break;
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default:
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printf("unknown\n");
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return;
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}
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printf("\n");
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unwindstack::UnwinderFromPid unwinder(1024, pid);
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if (!unwinder.Init(regs->Arch())) {
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printf("Failed to init unwinder object.\n");
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return;
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}
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unwinder.SetRegs(regs);
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unwinder.Unwind();
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// Print the frames.
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for (size_t i = 0; i < unwinder.NumFrames(); i++) {
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printf("%s\n", unwinder.FormatFrame(i).c_str());
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}
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}
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int main(int argc, char** argv) {
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if (argc != 2) {
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printf("Usage: unwind <PID>\n");
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return 1;
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}
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pid_t pid = atoi(argv[1]);
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if (!Attach(pid)) {
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printf("Failed to attach to pid %d: %s\n", pid, strerror(errno));
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return 1;
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}
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DoUnwind(pid);
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ptrace(PTRACE_DETACH, pid, 0, 0);
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return 0;
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}
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