4015ef411a
I have changed the root DEX debug descriptor in ART to more closely follow the JIT debug descriptor. Add the appropriate offsets to correctly fetch the linked list head for DEX files. Test: testrunner.py -t 137 Test: libunwindstack_test Change-Id: I90402befc88fec42658f7330d51ee79756a7f872
206 lines
5 KiB
C++
206 lines
5 KiB
C++
/*
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* Copyright (C) 2018 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 <sys/mman.h>
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#include <sys/stat.h>
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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 <unwindstack/DexFiles.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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#include "DexFile.h"
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namespace unwindstack {
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struct DEXFileEntry32 {
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uint32_t next;
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uint32_t prev;
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uint32_t dex_file;
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};
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struct DEXFileEntry64 {
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uint64_t next;
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uint64_t prev;
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uint64_t dex_file;
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};
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DexFiles::DexFiles(std::shared_ptr<Memory>& memory) : memory_(memory) {}
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DexFiles::DexFiles(std::shared_ptr<Memory>& memory, std::vector<std::string>& search_libs)
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: memory_(memory), search_libs_(search_libs) {}
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DexFiles::~DexFiles() {
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for (auto& entry : files_) {
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delete entry.second;
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}
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}
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void DexFiles::SetArch(ArchEnum arch) {
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switch (arch) {
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case ARCH_ARM:
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case ARCH_MIPS:
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case ARCH_X86:
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read_entry_ptr_func_ = &DexFiles::ReadEntryPtr32;
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read_entry_func_ = &DexFiles::ReadEntry32;
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break;
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case ARCH_ARM64:
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case ARCH_MIPS64:
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case ARCH_X86_64:
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read_entry_ptr_func_ = &DexFiles::ReadEntryPtr64;
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read_entry_func_ = &DexFiles::ReadEntry64;
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break;
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case ARCH_UNKNOWN:
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abort();
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}
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}
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uint64_t DexFiles::ReadEntryPtr32(uint64_t addr) {
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uint32_t entry;
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const uint32_t field_offset = 12; // offset of first_entry_ in the descriptor struct.
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if (!memory_->ReadFully(addr + field_offset, &entry, sizeof(entry))) {
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return 0;
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}
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return entry;
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}
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uint64_t DexFiles::ReadEntryPtr64(uint64_t addr) {
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uint64_t entry;
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const uint32_t field_offset = 16; // offset of first_entry_ in the descriptor struct.
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if (!memory_->ReadFully(addr + field_offset, &entry, sizeof(entry))) {
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return 0;
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}
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return entry;
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}
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bool DexFiles::ReadEntry32() {
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DEXFileEntry32 entry;
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if (!memory_->ReadFully(entry_addr_, &entry, sizeof(entry)) || entry.dex_file == 0) {
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entry_addr_ = 0;
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return false;
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}
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addrs_.push_back(entry.dex_file);
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entry_addr_ = entry.next;
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return true;
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}
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bool DexFiles::ReadEntry64() {
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DEXFileEntry64 entry;
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if (!memory_->ReadFully(entry_addr_, &entry, sizeof(entry)) || entry.dex_file == 0) {
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entry_addr_ = 0;
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return false;
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}
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addrs_.push_back(entry.dex_file);
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entry_addr_ = entry.next;
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return true;
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}
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void DexFiles::Init(Maps* maps) {
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if (initialized_) {
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return;
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}
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initialized_ = true;
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entry_addr_ = 0;
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const std::string dex_debug_name("__dex_debug_descriptor");
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for (MapInfo* info : *maps) {
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if (!(info->flags & PROT_EXEC) || !(info->flags & PROT_READ) || info->offset != 0) {
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continue;
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}
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if (!search_libs_.empty()) {
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bool found = false;
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const char* lib = basename(info->name.c_str());
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for (const std::string& name : search_libs_) {
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if (name == lib) {
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found = true;
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break;
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}
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}
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if (!found) {
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continue;
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}
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}
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Elf* elf = info->GetElf(memory_, true);
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uint64_t ptr;
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// Find first non-empty list (libart might be loaded multiple times).
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if (elf->GetGlobalVariable(dex_debug_name, &ptr) && ptr != 0) {
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entry_addr_ = (this->*read_entry_ptr_func_)(ptr + info->start);
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if (entry_addr_ != 0) {
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break;
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}
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}
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}
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}
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DexFile* DexFiles::GetDexFile(uint64_t dex_file_offset, MapInfo* info) {
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// Lock while processing the data.
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DexFile* dex_file;
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auto entry = files_.find(dex_file_offset);
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if (entry == files_.end()) {
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dex_file = DexFile::Create(dex_file_offset, memory_.get(), info);
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files_[dex_file_offset] = dex_file;
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} else {
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dex_file = entry->second;
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}
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return dex_file;
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}
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bool DexFiles::GetAddr(size_t index, uint64_t* addr) {
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if (index < addrs_.size()) {
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*addr = addrs_[index];
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return true;
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}
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if (entry_addr_ != 0 && (this->*read_entry_func_)()) {
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*addr = addrs_.back();
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return true;
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}
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return false;
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}
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void DexFiles::GetMethodInformation(Maps* maps, MapInfo* info, uint64_t dex_pc,
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std::string* method_name, uint64_t* method_offset) {
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std::lock_guard<std::mutex> guard(lock_);
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if (!initialized_) {
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Init(maps);
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}
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size_t index = 0;
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uint64_t addr;
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while (GetAddr(index++, &addr)) {
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if (addr < info->start || addr >= info->end) {
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continue;
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}
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DexFile* dex_file = GetDexFile(addr, info);
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if (dex_file != nullptr &&
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dex_file->GetMethodInformation(dex_pc - addr, method_name, method_offset)) {
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break;
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}
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}
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}
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} // namespace unwindstack
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