3f805ac3f8
- Add a method to get the max size of an elf file by reading the section header offset + size. This will properly map an elf file embedded into an apk, instead of just mapping in what is done by the dynamic linker. It does assume that the section headers are at the end of the elf file. - Add new tests for the above functionality. - Update the unwind_symbols tool to take an address for finding a function instead of dumping the entire symbol table. Bug: 23762183 Test: Unit tests pass, unwind through the camera process and verify Test: the GoogleCamera.apk shows some function names. Change-Id: I00c021680fe1d43b60d652bf91bbf6667d9617be
121 lines
3.1 KiB
C++
121 lines
3.1 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 <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 <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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namespace unwindstack {
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Memory* MapInfo::GetFileMemory() {
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std::unique_ptr<MemoryFileAtOffset> memory(new MemoryFileAtOffset);
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if (offset == 0) {
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if (memory->Init(name, 0)) {
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return memory.release();
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}
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return nullptr;
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}
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// There are two possibilities when the offset is non-zero.
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// - There is an elf file embedded in a file.
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// - The whole file is an elf file, and the offset needs to be saved.
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//
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// Map in just the part of the file for the map. If this is not
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// a valid elf, then reinit as if the whole file is an elf file.
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// If the offset is a valid elf, then determine the size of the map
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// and reinit to that size. This is needed because the dynamic linker
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// only maps in a portion of the original elf, and never the symbol
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// file data.
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uint64_t map_size = end - start;
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if (!memory->Init(name, offset, map_size)) {
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return nullptr;
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}
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bool valid;
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uint64_t max_size;
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Elf::GetInfo(memory.get(), &valid, &max_size);
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if (!valid) {
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// Init as if the whole file is an elf.
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if (memory->Init(name, 0)) {
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elf_offset = offset;
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return memory.release();
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}
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return nullptr;
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}
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if (max_size > map_size) {
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if (memory->Init(name, offset, max_size)) {
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return memory.release();
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}
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// Try to reinit using the default map_size.
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if (memory->Init(name, offset, map_size)) {
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return memory.release();
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}
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return nullptr;
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}
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return memory.release();
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}
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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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Memory* memory = GetFileMemory();
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if (memory != nullptr) {
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return memory;
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}
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}
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Memory* memory;
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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 init_gnu_debugdata) {
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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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if (elf->Init() && init_gnu_debugdata) {
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elf->InitGnuDebugdata();
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}
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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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} // namespace unwindstack
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