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
140 lines
3.8 KiB
C++
140 lines
3.8 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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#include <stdint.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <string>
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#include <vector>
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#include <backtrace/BacktraceMap.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 "UnwindStackMap.h"
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//-------------------------------------------------------------------------
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UnwindStackMap::UnwindStackMap(pid_t pid) : BacktraceMap(pid) {}
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bool UnwindStackMap::Build() {
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if (pid_ == 0) {
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pid_ = getpid();
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stack_maps_.reset(new unwindstack::LocalMaps);
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} else {
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stack_maps_.reset(new unwindstack::RemoteMaps(pid_));
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}
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// Create the process memory object.
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process_memory_ = unwindstack::Memory::CreateProcessMemory(pid_);
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// Create a JitDebug object for getting jit unwind information.
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std::vector<std::string> search_libs_{"libart.so", "libartd.so"};
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jit_debug_.reset(new unwindstack::JitDebug(process_memory_, search_libs_));
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if (!stack_maps_->Parse()) {
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return false;
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}
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// Iterate through the maps and fill in the backtrace_map_t structure.
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for (auto* map_info : *stack_maps_) {
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backtrace_map_t map;
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map.start = map_info->start;
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map.end = map_info->end;
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map.offset = map_info->offset;
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// Set to -1 so that it is demand loaded.
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map.load_bias = static_cast<uint64_t>(-1);
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map.flags = map_info->flags;
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map.name = map_info->name;
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maps_.push_back(map);
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}
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return true;
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}
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void UnwindStackMap::FillIn(uint64_t addr, backtrace_map_t* map) {
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BacktraceMap::FillIn(addr, map);
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if (map->load_bias != static_cast<uint64_t>(-1)) {
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return;
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}
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// Fill in the load_bias.
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unwindstack::MapInfo* map_info = stack_maps_->Find(addr);
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if (map_info == nullptr) {
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return;
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}
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map->load_bias = map_info->GetLoadBias(process_memory_);
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}
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uint64_t UnwindStackMap::GetLoadBias(size_t index) {
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if (index >= stack_maps_->Total()) {
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return 0;
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}
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unwindstack::MapInfo* map_info = stack_maps_->Get(index);
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if (map_info == nullptr) {
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return 0;
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}
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return map_info->GetLoadBias(process_memory_);
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}
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std::string UnwindStackMap::GetFunctionName(uint64_t pc, uint64_t* offset) {
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*offset = 0;
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unwindstack::Maps* maps = stack_maps();
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// Get the map for this
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unwindstack::MapInfo* map_info = maps->Find(pc);
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if (map_info == nullptr || map_info->flags & PROT_DEVICE_MAP) {
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return "";
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}
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unwindstack::Elf* elf = map_info->GetElf(process_memory(), true);
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std::string name;
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uint64_t func_offset;
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if (!elf->GetFunctionName(elf->GetRelPc(pc, map_info), &name, &func_offset)) {
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return "";
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}
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*offset = func_offset;
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return name;
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}
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std::shared_ptr<unwindstack::Memory> UnwindStackMap::GetProcessMemory() {
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return process_memory_;
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}
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//-------------------------------------------------------------------------
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// BacktraceMap create function.
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//-------------------------------------------------------------------------
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BacktraceMap* BacktraceMap::Create(pid_t pid, bool uncached) {
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BacktraceMap* map;
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if (uncached) {
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// Force use of the base class to parse the maps when this call is made.
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map = new BacktraceMap(pid);
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} else if (pid == getpid()) {
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map = new UnwindStackMap(0);
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} else {
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map = new UnwindStackMap(pid);
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}
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if (!map->Build()) {
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delete map;
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return nullptr;
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}
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return map;
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}
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