87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
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/*
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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 <sys/types.h>
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#include <unistd.h>
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#include <memory>
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#include <string>
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#include "Elf.h"
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#include "MapInfo.h"
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#include "Maps.h"
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#include "Memory.h"
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Memory* MapInfo::CreateMemory(pid_t pid) {
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if (end <= start) {
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return nullptr;
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}
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elf_offset = 0;
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// First try and use the file associated with the info.
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if (!name.empty()) {
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// Fail on device maps.
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if (flags & MAPS_FLAGS_DEVICE_MAP) {
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return nullptr;
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}
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std::unique_ptr<MemoryFileAtOffset> file_memory(new MemoryFileAtOffset);
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uint64_t map_size;
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if (offset != 0) {
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// Only map in a piece of the file.
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map_size = end - start;
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} else {
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map_size = UINT64_MAX;
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}
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if (file_memory->Init(name, offset, map_size)) {
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// It's possible that a non-zero offset might not be pointing to
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// valid elf data. Check if this is a valid elf, and if not assume
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// that this was meant to incorporate the entire file.
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if (offset != 0 && !Elf::IsValidElf(file_memory.get())) {
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// Don't bother checking the validity that will happen on the elf init.
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if (file_memory->Init(name, 0)) {
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elf_offset = offset;
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return file_memory.release();
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}
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// Fall through if the init fails.
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} else {
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return file_memory.release();
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}
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}
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}
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Memory* memory = nullptr;
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if (pid == getpid()) {
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memory = new MemoryLocal();
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} else {
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memory = new MemoryRemote(pid);
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}
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return new MemoryRange(memory, start, end);
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}
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Elf* MapInfo::GetElf(pid_t pid, bool) {
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if (elf) {
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return elf;
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}
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elf = new Elf(CreateMemory(pid));
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elf->Init();
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// If the init fails, keep the elf around as an invalid object so we
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// don't try to reinit the object.
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return elf;
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}
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