b7de5f5429
Add a static GetLoadBias method to the Elf object that only reads just enough to get the load bias. Add a method to MapInfo that gets the load bias. First attempt to get it if the elf object already exists. If no elf object was created, use the new static method to get the load bias. In BacktraceMap, add a custom iterator so that when code dereferences a map element, that's when the load bias will be retrieved if it hasn't already been set. Bug: 69871050 Test: New unit tests, verify tombstones have non-zero load bias values for Test: libraries with a non-zero load bias. Change-Id: I125f4abc827589957fce2f0df24b0f25d037d732
133 lines
3.6 KiB
C++
133 lines
3.6 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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#include <stdint.h>
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#include <stdlib.h>
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#include <sys/types.h>
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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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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<uintptr_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(uintptr_t addr, backtrace_map_t* map) {
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BacktraceMap::FillIn(addr, map);
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if (map->load_bias != static_cast<uintptr_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(uintptr_t pc, uintptr_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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