b05c472421
This simplifies some of the logic and removes the need to pass an Arch value to functions that should already know about the arch it is operating on. Includes fixes for debuggerd/libbacktrace. Added new unit tests to cover new cases. Test: All unit tests pass. Test: Faked unwinder failing to verify debuggerd error messages display Test: properly in backtrace and tombstone. Change-Id: I439fcae0695befcfb1cb4c0a786cc74949d33425
119 lines
2.8 KiB
C++
119 lines
2.8 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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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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