479 lines
15 KiB
C++
479 lines
15 KiB
C++
/*
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* Copyright (C) 2017 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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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE 1
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#endif
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#include <elf.h>
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#include <inttypes.h>
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#include <stdint.h>
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#include <compat/string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <algorithm>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.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/MapInfo.h>
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#include <unwindstack/Maps.h>
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#include <unwindstack/Memory.h>
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#include <unwindstack/Unwinder.h>
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#include "Check.h"
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// Use the demangler from libc++.
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extern "C" char* __cxa_demangle(const char*, char*, size_t*, int* status);
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namespace unwindstack {
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// Inject extra 'virtual' frame that represents the dex pc data.
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// The dex pc is a magic register defined in the Mterp interpreter,
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// and thus it will be restored/observed in the frame after it.
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// Adding the dex frame first here will create something like:
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// #7 pc 0015fa20 core.vdex java.util.Arrays.binarySearch+8
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// #8 pc 006b1ba1 libartd.so ExecuteMterpImpl+14625
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// #9 pc 0039a1ef libartd.so art::interpreter::Execute+719
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void Unwinder::FillInDexFrame() {
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size_t frame_num = frames_.size();
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frames_.resize(frame_num + 1);
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FrameData* frame = &frames_.at(frame_num);
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frame->num = frame_num;
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uint64_t dex_pc = regs_->dex_pc();
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frame->pc = dex_pc;
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frame->sp = regs_->sp();
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MapInfo* info = maps_->Find(dex_pc);
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if (info != nullptr) {
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frame->map_start = info->start;
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frame->map_end = info->end;
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// Since this is a dex file frame, the elf_start_offset is not set
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// by any of the normal code paths. Use the offset of the map since
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// that matches the actual offset.
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frame->map_elf_start_offset = info->offset;
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frame->map_exact_offset = info->offset;
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frame->map_load_bias = info->load_bias;
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frame->map_flags = info->flags;
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if (resolve_names_) {
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frame->map_name = info->name;
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}
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frame->rel_pc = dex_pc - info->start;
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} else {
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frame->rel_pc = dex_pc;
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warnings_ |= WARNING_DEX_PC_NOT_IN_MAP;
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return;
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}
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if (!resolve_names_) {
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return;
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}
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#if defined(DEXFILE_SUPPORT)
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if (dex_files_ == nullptr) {
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return;
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}
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dex_files_->GetMethodInformation(maps_, info, dex_pc, &frame->function_name,
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&frame->function_offset);
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#endif
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}
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FrameData* Unwinder::FillInFrame(MapInfo* map_info, Elf* elf, uint64_t rel_pc,
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uint64_t pc_adjustment) {
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size_t frame_num = frames_.size();
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frames_.resize(frame_num + 1);
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FrameData* frame = &frames_.at(frame_num);
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frame->num = frame_num;
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frame->sp = regs_->sp();
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frame->rel_pc = rel_pc - pc_adjustment;
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frame->pc = regs_->pc() - pc_adjustment;
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if (map_info == nullptr) {
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// Nothing else to update.
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return nullptr;
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}
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if (resolve_names_) {
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frame->map_name = map_info->name;
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if (embedded_soname_ && map_info->elf_start_offset != 0 && !frame->map_name.empty()) {
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std::string soname = elf->GetSoname();
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if (!soname.empty()) {
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frame->map_name += '!' + soname;
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}
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}
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}
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frame->map_elf_start_offset = map_info->elf_start_offset;
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frame->map_exact_offset = map_info->offset;
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frame->map_start = map_info->start;
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frame->map_end = map_info->end;
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frame->map_flags = map_info->flags;
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frame->map_load_bias = elf->GetLoadBias();
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return frame;
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}
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static bool ShouldStop(const std::vector<std::string>* map_suffixes_to_ignore,
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std::string& map_name) {
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if (map_suffixes_to_ignore == nullptr) {
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return false;
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}
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auto pos = map_name.find_last_of('.');
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if (pos == std::string::npos) {
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return false;
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}
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return std::find(map_suffixes_to_ignore->begin(), map_suffixes_to_ignore->end(),
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map_name.substr(pos + 1)) != map_suffixes_to_ignore->end();
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}
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void Unwinder::Unwind(const std::vector<std::string>* initial_map_names_to_skip,
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const std::vector<std::string>* map_suffixes_to_ignore) {
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CHECK(arch_ != ARCH_UNKNOWN);
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ClearErrors();
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frames_.clear();
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elf_from_memory_not_file_ = false;
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bool return_address_attempt = false;
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bool adjust_pc = false;
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for (; frames_.size() < max_frames_;) {
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uint64_t cur_pc = regs_->pc();
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uint64_t cur_sp = regs_->sp();
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MapInfo* map_info = maps_->Find(regs_->pc());
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uint64_t pc_adjustment = 0;
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uint64_t step_pc;
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uint64_t rel_pc;
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Elf* elf;
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if (map_info == nullptr) {
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step_pc = regs_->pc();
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rel_pc = step_pc;
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last_error_.code = ERROR_INVALID_MAP;
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elf = nullptr;
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} else {
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if (ShouldStop(map_suffixes_to_ignore, map_info->name)) {
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break;
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}
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elf = map_info->GetElf(process_memory_, arch_);
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// If this elf is memory backed, and there is a valid file, then set
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// an indicator that we couldn't open the file.
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if (!elf_from_memory_not_file_ && map_info->memory_backed_elf && !map_info->name.empty() &&
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map_info->name[0] != '[' && !android::base::StartsWith(map_info->name, "/memfd:")) {
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elf_from_memory_not_file_ = true;
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}
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step_pc = regs_->pc();
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rel_pc = elf->GetRelPc(step_pc, map_info);
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// Everyone except elf data in gdb jit debug maps uses the relative pc.
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if (!(map_info->flags & MAPS_FLAGS_JIT_SYMFILE_MAP)) {
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step_pc = rel_pc;
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}
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if (adjust_pc) {
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pc_adjustment = GetPcAdjustment(rel_pc, elf, arch_);
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} else {
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pc_adjustment = 0;
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}
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step_pc -= pc_adjustment;
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// If the pc is in an invalid elf file, try and get an Elf object
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// using the jit debug information.
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if (!elf->valid() && jit_debug_ != nullptr) {
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uint64_t adjusted_jit_pc = regs_->pc() - pc_adjustment;
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Elf* jit_elf = jit_debug_->GetElf(maps_, adjusted_jit_pc);
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if (jit_elf != nullptr) {
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// The jit debug information requires a non relative adjusted pc.
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step_pc = adjusted_jit_pc;
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elf = jit_elf;
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}
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}
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}
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FrameData* frame = nullptr;
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if (map_info == nullptr || initial_map_names_to_skip == nullptr ||
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std::find(initial_map_names_to_skip->begin(), initial_map_names_to_skip->end(),
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_unwinder_basename(map_info->name.c_str())) == initial_map_names_to_skip->end()) {
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if (regs_->dex_pc() != 0) {
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// Add a frame to represent the dex file.
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FillInDexFrame();
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// Clear the dex pc so that we don't repeat this frame later.
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regs_->set_dex_pc(0);
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// Make sure there is enough room for the real frame.
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if (frames_.size() == max_frames_) {
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last_error_.code = ERROR_MAX_FRAMES_EXCEEDED;
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break;
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}
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}
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frame = FillInFrame(map_info, elf, rel_pc, pc_adjustment);
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// Once a frame is added, stop skipping frames.
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initial_map_names_to_skip = nullptr;
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}
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adjust_pc = true;
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bool stepped = false;
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bool in_device_map = false;
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bool finished = false;
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if (map_info != nullptr) {
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if (map_info->flags & MAPS_FLAGS_DEVICE_MAP) {
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// Do not stop here, fall through in case we are
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// in the speculative unwind path and need to remove
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// some of the speculative frames.
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in_device_map = true;
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} else {
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MapInfo* sp_info = maps_->Find(regs_->sp());
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if (sp_info != nullptr && sp_info->flags & MAPS_FLAGS_DEVICE_MAP) {
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// Do not stop here, fall through in case we are
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// in the speculative unwind path and need to remove
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// some of the speculative frames.
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in_device_map = true;
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} else {
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bool is_signal_frame = false;
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if (elf->StepIfSignalHandler(rel_pc, regs_, process_memory_.get())) {
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stepped = true;
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is_signal_frame = true;
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} else if (elf->Step(step_pc, regs_, process_memory_.get(), &finished,
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&is_signal_frame)) {
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stepped = true;
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}
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if (is_signal_frame && frame != nullptr) {
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// Need to adjust the relative pc because the signal handler
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// pc should not be adjusted.
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frame->rel_pc = rel_pc;
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frame->pc += pc_adjustment;
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step_pc = rel_pc;
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}
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elf->GetLastError(&last_error_);
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}
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}
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}
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if (frame != nullptr) {
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if (!resolve_names_ ||
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!elf->GetFunctionName(step_pc, &frame->function_name, &frame->function_offset)) {
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frame->function_name = "";
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frame->function_offset = 0;
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}
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}
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if (finished) {
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break;
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}
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if (!stepped) {
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if (return_address_attempt) {
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// Only remove the speculative frame if there are more than two frames
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// or the pc in the first frame is in a valid map.
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// This allows for a case where the code jumps into the middle of
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// nowhere, but there is no other unwind information after that.
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if (frames_.size() > 2 || (frames_.size() > 0 && maps_->Find(frames_[0].pc) != nullptr)) {
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// Remove the speculative frame.
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frames_.pop_back();
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}
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break;
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} else if (in_device_map) {
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// Do not attempt any other unwinding, pc or sp is in a device
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// map.
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break;
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} else {
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// Steping didn't work, try this secondary method.
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if (!regs_->SetPcFromReturnAddress(process_memory_.get())) {
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break;
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}
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return_address_attempt = true;
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}
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} else {
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return_address_attempt = false;
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if (max_frames_ == frames_.size()) {
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last_error_.code = ERROR_MAX_FRAMES_EXCEEDED;
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}
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}
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// If the pc and sp didn't change, then consider everything stopped.
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if (cur_pc == regs_->pc() && cur_sp == regs_->sp()) {
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last_error_.code = ERROR_REPEATED_FRAME;
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break;
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}
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}
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}
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std::string Unwinder::FormatFrame(const FrameData& frame) const {
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std::string data;
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if (ArchIs32Bit(arch_)) {
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data += android::base::StringPrintf(" #%02zu pc %08" PRIx64, frame.num, frame.rel_pc);
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} else {
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data += android::base::StringPrintf(" #%02zu pc %016" PRIx64, frame.num, frame.rel_pc);
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}
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if (frame.map_start == frame.map_end) {
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// No valid map associated with this frame.
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data += " <unknown>";
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} else if (!frame.map_name.empty()) {
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data += " " + frame.map_name;
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} else {
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data += android::base::StringPrintf(" <anonymous:%" PRIx64 ">", frame.map_start);
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}
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if (frame.map_elf_start_offset != 0) {
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data += android::base::StringPrintf(" (offset 0x%" PRIx64 ")", frame.map_elf_start_offset);
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}
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if (!frame.function_name.empty()) {
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char* demangled_name = __cxa_demangle(frame.function_name.c_str(), nullptr, nullptr, nullptr);
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if (demangled_name == nullptr) {
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data += " (" + frame.function_name;
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} else {
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data += " (";
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data += demangled_name;
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free(demangled_name);
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}
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if (frame.function_offset != 0) {
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data += android::base::StringPrintf("+%" PRId64, frame.function_offset);
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}
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data += ')';
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}
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MapInfo* map_info = maps_->Find(frame.map_start);
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if (map_info != nullptr && display_build_id_) {
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std::string build_id = map_info->GetPrintableBuildID();
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if (!build_id.empty()) {
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data += " (BuildId: " + build_id + ')';
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}
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}
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return data;
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}
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std::string Unwinder::FormatFrame(size_t frame_num) const {
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if (frame_num >= frames_.size()) {
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return "";
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}
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return FormatFrame(frames_[frame_num]);
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}
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void Unwinder::SetJitDebug(JitDebug* jit_debug) {
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CHECK(arch_ != ARCH_UNKNOWN);
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jit_debug->SetArch(arch_);
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jit_debug_ = jit_debug;
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}
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void Unwinder::SetDexFiles(DexFiles* dex_files) {
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CHECK(arch_ != ARCH_UNKNOWN);
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dex_files->SetArch(arch_);
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dex_files_ = dex_files;
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}
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bool UnwinderFromPid::Init() {
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CHECK(arch_ != ARCH_UNKNOWN);
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if (initted_) {
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return true;
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}
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initted_ = true;
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if (pid_ == getpid()) {
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maps_ptr_.reset(new LocalMaps());
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} else {
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maps_ptr_.reset(new RemoteMaps(pid_));
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}
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if (!maps_ptr_->Parse()) {
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ClearErrors();
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last_error_.code = ERROR_INVALID_MAP;
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return false;
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}
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maps_ = maps_ptr_.get();
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process_memory_ = Memory::CreateProcessMemoryCached(pid_);
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jit_debug_ptr_.reset(new JitDebug(process_memory_));
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jit_debug_ = jit_debug_ptr_.get();
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SetJitDebug(jit_debug_);
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#if defined(DEXFILE_SUPPORT)
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dex_files_ptr_.reset(new DexFiles(process_memory_));
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dex_files_ = dex_files_ptr_.get();
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SetDexFiles(dex_files_);
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#endif
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return true;
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}
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void UnwinderFromPid::Unwind(const std::vector<std::string>* initial_map_names_to_skip,
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const std::vector<std::string>* map_suffixes_to_ignore) {
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if (!Init()) {
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return;
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}
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Unwinder::Unwind(initial_map_names_to_skip, map_suffixes_to_ignore);
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}
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FrameData Unwinder::BuildFrameFromPcOnly(uint64_t pc, ArchEnum arch, Maps* maps,
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JitDebug* jit_debug,
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std::shared_ptr<Memory> process_memory,
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bool resolve_names) {
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FrameData frame;
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MapInfo* map_info = maps->Find(pc);
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if (map_info == nullptr || arch == ARCH_UNKNOWN) {
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frame.pc = pc;
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frame.rel_pc = pc;
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return frame;
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}
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Elf* elf = map_info->GetElf(process_memory, arch);
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uint64_t relative_pc = elf->GetRelPc(pc, map_info);
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uint64_t pc_adjustment = GetPcAdjustment(relative_pc, elf, arch);
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relative_pc -= pc_adjustment;
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// The debug PC may be different if the PC comes from the JIT.
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uint64_t debug_pc = relative_pc;
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// If we don't have a valid ELF file, check the JIT.
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if (!elf->valid() && jit_debug != nullptr) {
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uint64_t jit_pc = pc - pc_adjustment;
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Elf* jit_elf = jit_debug->GetElf(maps, jit_pc);
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if (jit_elf != nullptr) {
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debug_pc = jit_pc;
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elf = jit_elf;
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}
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}
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// Copy all the things we need into the frame for symbolization.
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frame.rel_pc = relative_pc;
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frame.pc = pc - pc_adjustment;
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frame.map_name = map_info->name;
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frame.map_elf_start_offset = map_info->elf_start_offset;
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frame.map_exact_offset = map_info->offset;
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frame.map_start = map_info->start;
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frame.map_end = map_info->end;
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frame.map_flags = map_info->flags;
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frame.map_load_bias = elf->GetLoadBias();
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if (!resolve_names ||
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!elf->GetFunctionName(debug_pc, &frame.function_name, &frame.function_offset)) {
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frame.function_name = "";
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frame.function_offset = 0;
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}
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return frame;
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}
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FrameData Unwinder::BuildFrameFromPcOnly(uint64_t pc) {
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return BuildFrameFromPcOnly(pc, arch_, maps_, jit_debug_, process_memory_, resolve_names_);
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}
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} // namespace unwindstack
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