98984b41da
Changes: - Change the register type from int16_t to uint32_t for the location data and the Eval processing. This is because the special dex pc is > 65535. - Add the ability for Dwarf register location information to point to a register that is itself a Dwarf location register. - Add dex_pc to the frame information. - Modify the unwind tool to print the dex pc if non-zero. This does not implement the printing of the dex information in anything but the unwind tool. It's not the final form of this printing. Bug: 72070049 Test: Ran new unit tests. Test: Dumped stack while in interpreter running 137-cfi art test and Test: verified dex pc is set to non-zero. Change-Id: I6ce8a6b577fb4f92abacbd433b1f68977e272542
126 lines
3.1 KiB
C++
126 lines
3.1 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/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_ATTACH, pid, 0, 0) == -1) {
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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::RemoteMaps remote_maps(pid);
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if (!remote_maps.Parse()) {
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printf("Failed to parse map data.\n");
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return;
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}
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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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auto process_memory = unwindstack::Memory::CreateProcessMemory(pid);
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unwindstack::Unwinder unwinder(128, &remote_maps, regs, process_memory);
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unwindstack::JitDebug jit_debug(process_memory);
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unwinder.SetJitDebug(&jit_debug, regs->Arch());
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unwinder.Unwind();
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// Print the frames.
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const std::vector<unwindstack::FrameData>& frames = unwinder.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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const unwindstack::FrameData* frame = &frames[i];
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if (frame->dex_pc != 0) {
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printf(" dex pc %" PRIx64 "\n", frame->dex_pc);
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}
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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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