458f4e725d
In cases where there might be a crash in the unwind library itself, we need a method to avoid skipping these frames or we won't be able to see the actual crash. Added unit test for this behavior. Bug: 74121887 Test: Ran unit tests on host and target. Change-Id: I45825020c174016af39dd8ffdc67acb72a24ad4d
260 lines
8.5 KiB
C++
260 lines
8.5 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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#define _GNU_SOURCE 1
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <memory>
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#include <set>
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#include <string>
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#if !defined(__ANDROID__)
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#include <cutils/threads.h>
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#endif
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#include <backtrace/Backtrace.h>
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#include <demangle.h>
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#include <unwindstack/Elf.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/Regs.h>
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#include <unwindstack/RegsGetLocal.h>
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#if !defined(NO_LIBDEXFILE_SUPPORT)
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#include <unwindstack/DexFiles.h>
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#endif
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#include <unwindstack/Unwinder.h>
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#include "BacktraceLog.h"
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#include "UnwindStack.h"
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#include "UnwindStackMap.h"
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bool Backtrace::Unwind(unwindstack::Regs* regs, BacktraceMap* back_map,
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std::vector<backtrace_frame_data_t>* frames, size_t num_ignore_frames,
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std::vector<std::string>* skip_names, BacktraceUnwindError* error) {
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UnwindStackMap* stack_map = reinterpret_cast<UnwindStackMap*>(back_map);
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auto process_memory = stack_map->process_memory();
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unwindstack::Unwinder unwinder(MAX_BACKTRACE_FRAMES + num_ignore_frames, stack_map->stack_maps(),
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regs, stack_map->process_memory());
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unwinder.SetResolveNames(stack_map->ResolveNames());
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if (stack_map->GetJitDebug() != nullptr) {
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unwinder.SetJitDebug(stack_map->GetJitDebug(), regs->Arch());
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}
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#if !defined(NO_LIBDEXFILE_SUPPORT)
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if (stack_map->GetDexFiles() != nullptr) {
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unwinder.SetDexFiles(stack_map->GetDexFiles(), regs->Arch());
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}
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#endif
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unwinder.Unwind(skip_names, &stack_map->GetSuffixesToIgnore());
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if (error != nullptr) {
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switch (unwinder.LastErrorCode()) {
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case unwindstack::ERROR_NONE:
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error->error_code = BACKTRACE_UNWIND_NO_ERROR;
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break;
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case unwindstack::ERROR_MEMORY_INVALID:
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error->error_code = BACKTRACE_UNWIND_ERROR_ACCESS_MEM_FAILED;
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error->error_info.addr = unwinder.LastErrorAddress();
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break;
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case unwindstack::ERROR_UNWIND_INFO:
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error->error_code = BACKTRACE_UNWIND_ERROR_UNWIND_INFO;
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break;
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case unwindstack::ERROR_UNSUPPORTED:
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error->error_code = BACKTRACE_UNWIND_ERROR_UNSUPPORTED_OPERATION;
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break;
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case unwindstack::ERROR_INVALID_MAP:
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error->error_code = BACKTRACE_UNWIND_ERROR_MAP_MISSING;
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break;
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case unwindstack::ERROR_MAX_FRAMES_EXCEEDED:
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error->error_code = BACKTRACE_UNWIND_ERROR_EXCEED_MAX_FRAMES_LIMIT;
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break;
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case unwindstack::ERROR_REPEATED_FRAME:
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error->error_code = BACKTRACE_UNWIND_ERROR_REPEATED_FRAME;
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break;
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}
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}
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if (num_ignore_frames >= unwinder.NumFrames()) {
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frames->resize(0);
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return true;
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}
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auto unwinder_frames = unwinder.frames();
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frames->resize(unwinder.NumFrames() - num_ignore_frames);
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size_t cur_frame = 0;
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for (size_t i = num_ignore_frames; i < unwinder.NumFrames(); i++) {
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auto frame = &unwinder_frames[i];
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backtrace_frame_data_t* back_frame = &frames->at(cur_frame);
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back_frame->num = cur_frame++;
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back_frame->rel_pc = frame->rel_pc;
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back_frame->pc = frame->pc;
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back_frame->sp = frame->sp;
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back_frame->func_name = demangle(frame->function_name.c_str());
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back_frame->func_offset = frame->function_offset;
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back_frame->map.name = frame->map_name;
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back_frame->map.start = frame->map_start;
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back_frame->map.end = frame->map_end;
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back_frame->map.offset = frame->map_offset;
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back_frame->map.load_bias = frame->map_load_bias;
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back_frame->map.flags = frame->map_flags;
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}
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return true;
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}
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bool Backtrace::UnwindOffline(unwindstack::Regs* regs, BacktraceMap* back_map,
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const backtrace_stackinfo_t& stack,
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std::vector<backtrace_frame_data_t>* frames,
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BacktraceUnwindError* error) {
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UnwindStackOfflineMap* offline_map = reinterpret_cast<UnwindStackOfflineMap*>(back_map);
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// Create the process memory from the stack data since this will almost
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// always be different each unwind.
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if (!offline_map->CreateProcessMemory(stack)) {
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if (error != nullptr) {
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error->error_code = BACKTRACE_UNWIND_ERROR_SETUP_FAILED;
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}
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return false;
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}
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return Backtrace::Unwind(regs, back_map, frames, 0U, nullptr, error);
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}
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UnwindStackCurrent::UnwindStackCurrent(pid_t pid, pid_t tid, BacktraceMap* map)
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: BacktraceCurrent(pid, tid, map) {}
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std::string UnwindStackCurrent::GetFunctionNameRaw(uint64_t pc, uint64_t* offset) {
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return GetMap()->GetFunctionName(pc, offset);
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}
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bool UnwindStackCurrent::UnwindFromContext(size_t num_ignore_frames, void* ucontext) {
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std::unique_ptr<unwindstack::Regs> regs;
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if (ucontext == nullptr) {
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regs.reset(unwindstack::Regs::CreateFromLocal());
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// Fill in the registers from this function. Do it here to avoid
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// one extra function call appearing in the unwind.
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unwindstack::RegsGetLocal(regs.get());
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} else {
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regs.reset(unwindstack::Regs::CreateFromUcontext(unwindstack::Regs::CurrentArch(), ucontext));
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}
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std::vector<std::string> skip_names{"libunwindstack.so", "libbacktrace.so"};
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if (!skip_frames_) {
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skip_names.clear();
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}
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return Backtrace::Unwind(regs.get(), GetMap(), &frames_, num_ignore_frames, &skip_names, &error_);
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}
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UnwindStackPtrace::UnwindStackPtrace(pid_t pid, pid_t tid, BacktraceMap* map)
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: BacktracePtrace(pid, tid, map), memory_(pid) {}
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std::string UnwindStackPtrace::GetFunctionNameRaw(uint64_t pc, uint64_t* offset) {
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return GetMap()->GetFunctionName(pc, offset);
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}
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bool UnwindStackPtrace::Unwind(size_t num_ignore_frames, void* context) {
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std::unique_ptr<unwindstack::Regs> regs;
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if (context == nullptr) {
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regs.reset(unwindstack::Regs::RemoteGet(Tid()));
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} else {
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regs.reset(unwindstack::Regs::CreateFromUcontext(unwindstack::Regs::CurrentArch(), context));
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}
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return Backtrace::Unwind(regs.get(), GetMap(), &frames_, num_ignore_frames, nullptr, &error_);
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}
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size_t UnwindStackPtrace::Read(uint64_t addr, uint8_t* buffer, size_t bytes) {
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return memory_.Read(addr, buffer, bytes);
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}
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UnwindStackOffline::UnwindStackOffline(ArchEnum arch, pid_t pid, pid_t tid, BacktraceMap* map,
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bool map_shared)
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: Backtrace(pid, tid, map), arch_(arch) {
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map_shared_ = map_shared;
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}
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bool UnwindStackOffline::Unwind(size_t num_ignore_frames, void* ucontext) {
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if (ucontext == nullptr) {
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return false;
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}
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unwindstack::ArchEnum arch;
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switch (arch_) {
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case ARCH_ARM:
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arch = unwindstack::ARCH_ARM;
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break;
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case ARCH_ARM64:
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arch = unwindstack::ARCH_ARM64;
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break;
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case ARCH_X86:
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arch = unwindstack::ARCH_X86;
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break;
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case ARCH_X86_64:
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arch = unwindstack::ARCH_X86_64;
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break;
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default:
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return false;
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}
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std::unique_ptr<unwindstack::Regs> regs(unwindstack::Regs::CreateFromUcontext(arch, ucontext));
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return Backtrace::Unwind(regs.get(), GetMap(), &frames_, num_ignore_frames, nullptr, &error_);
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}
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std::string UnwindStackOffline::GetFunctionNameRaw(uint64_t, uint64_t*) {
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return "";
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}
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size_t UnwindStackOffline::Read(uint64_t, uint8_t*, size_t) {
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return 0;
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}
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bool UnwindStackOffline::ReadWord(uint64_t, word_t*) {
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return false;
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}
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Backtrace* Backtrace::CreateOffline(ArchEnum arch, pid_t pid, pid_t tid,
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const std::vector<backtrace_map_t>& maps,
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const backtrace_stackinfo_t& stack) {
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std::unique_ptr<UnwindStackOfflineMap> map(
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reinterpret_cast<UnwindStackOfflineMap*>(BacktraceMap::CreateOffline(pid, maps)));
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if (map.get() == nullptr || !map->CreateProcessMemory(stack)) {
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return nullptr;
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}
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return new UnwindStackOffline(arch, pid, tid, map.release(), false);
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}
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Backtrace* Backtrace::CreateOffline(ArchEnum arch, pid_t pid, pid_t tid, BacktraceMap* map) {
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if (map == nullptr) {
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return nullptr;
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}
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return new UnwindStackOffline(arch, pid, tid, map, true);
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}
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void Backtrace::SetGlobalElfCache(bool enable) {
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unwindstack::Elf::SetCachingEnabled(enable);
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}
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