5f118519fd
New function to create the process memory object. This allows for a future where different remote process memory objects could be created depending on the way remote memory can be created. Even different local memory objects that access memory without doing any checks. It also allows MemoryRange objects to share one single process memory object and could help if the process memory object caches data. Small changes to MapInfo::CreateMemory to when some errors are detected. - Always check if the map is a device map, instead of only if the name is not empty. - Check if a memory map is readable before creating the memory from process memory. Bug: 23762183 Test: Ran unit tests, unwound on device using the new code. Change-Id: I12a93c2dc19639689a528ec41c67bfac74d431b3
97 lines
2.7 KiB
C++
97 lines
2.7 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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unwindstack::Elf* elf = map_info->GetElf(process_memory_, true);
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map->load_bias = elf->GetLoadBias();
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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::CreateNew(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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