7937a36c8e
In order to support the offline unwinding properly, get rid of the usage of non-fixed type uintptr_t from all API calls. In addition, completely remove the old local and remote unwinding code that used libunwind. The next step will be to move the offline unwinding to the new unwinder. Bug: 65682279 Test: Ran unit tests for libbacktrace/debuggerd. Test: Ran debuggerd -b on a few arm and arm64 processes. Test: Ran crasher and crasher64 and verified tombstones look correct. Change-Id: Ib0c6cee3ad6785a102b74908a3d8e5e93e5c6b33
132 lines
4.6 KiB
C++
132 lines
4.6 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 <ucontext.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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#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) {
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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.SetJitDebug(stack_map->GetJitDebug(), regs->Arch());
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unwinder.Unwind(skip_names, &stack_map->GetSuffixesToIgnore());
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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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frames->resize(unwinder.NumFrames() - num_ignore_frames);
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auto unwinder_frames = unwinder.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++, cur_frame++) {
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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 = frame->num - num_ignore_frames;
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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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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, ucontext_t* 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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error_.error_code = BACKTRACE_UNWIND_NO_ERROR;
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std::vector<std::string> skip_names{"libunwindstack.so", "libbacktrace.so"};
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return Backtrace::Unwind(regs.get(), GetMap(), &frames_, num_ignore_frames, &skip_names);
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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, ucontext_t* 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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error_.error_code = BACKTRACE_UNWIND_NO_ERROR;
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return Backtrace::Unwind(regs.get(), GetMap(), &frames_, num_ignore_frames, nullptr);
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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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