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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdint.h>
#include <stdlib.h>
#include <sys/types.h>
#include <string>
#include <vector>
#include <algorithm>
#include <backtrace/BacktraceMap.h>
#include <unwindstack/Elf.h>
#include <unwindstack/MapInfo.h>
#include <unwindstack/Maps.h>
#include <unwindstack/Regs.h>
#include "UnwindStackMap.h"
//-------------------------------------------------------------------------
UnwindStackMap::UnwindStackMap(pid_t pid) : BacktraceMap(pid) {}
bool UnwindStackMap::Build() {
if (pid_ == 0) {
pid_ = getpid();
stack_maps_.reset(new unwindstack::LocalMaps);
} else {
stack_maps_.reset(new unwindstack::RemoteMaps(pid_));
}
// Create the process memory object.
process_memory_ = unwindstack::Memory::CreateProcessMemory(pid_);
// Create a JitDebug object for getting jit unwind information.
std::vector<std::string> search_libs_{"libart.so", "libartd.so"};
jit_debug_.reset(new unwindstack::JitDebug(process_memory_, search_libs_));
#if !defined(NO_LIBDEXFILE_SUPPORT)
dex_files_.reset(new unwindstack::DexFiles(process_memory_, search_libs_));
#endif
if (!stack_maps_->Parse()) {
return false;
}
// Iterate through the maps and fill in the backtrace_map_t structure.
for (const auto& map_info : *stack_maps_) {
backtrace_map_t map;
map.start = map_info->start;
map.end = map_info->end;
map.offset = map_info->offset;
// Set to -1 so that it is demand loaded.
map.load_bias = static_cast<uint64_t>(-1);
map.flags = map_info->flags;
map.name = map_info->name;
maps_.push_back(map);
}
return true;
}
void UnwindStackMap::FillIn(uint64_t addr, backtrace_map_t* map) {
BacktraceMap::FillIn(addr, map);
if (map->load_bias != static_cast<uint64_t>(-1)) {
return;
}
// Fill in the load_bias.
unwindstack::MapInfo* map_info = stack_maps_->Find(addr);
if (map_info == nullptr) {
return;
}
map->load_bias = map_info->GetLoadBias(process_memory_);
}
uint64_t UnwindStackMap::GetLoadBias(size_t index) {
if (index >= stack_maps_->Total()) {
return 0;
}
unwindstack::MapInfo* map_info = stack_maps_->Get(index);
if (map_info == nullptr) {
return 0;
}
return map_info->GetLoadBias(process_memory_);
}
std::string UnwindStackMap::GetFunctionName(uint64_t pc, uint64_t* offset) {
*offset = 0;
unwindstack::Maps* maps = stack_maps();
// Get the map for this
unwindstack::MapInfo* map_info = maps->Find(pc);
if (map_info == nullptr || map_info->flags & PROT_DEVICE_MAP) {
return "";
}
if (arch_ == unwindstack::ARCH_UNKNOWN) {
if (pid_ == getpid()) {
arch_ = unwindstack::Regs::CurrentArch();
} else {
// Create a remote regs, to figure out the architecture.
std::unique_ptr<unwindstack::Regs> regs(unwindstack::Regs::RemoteGet(pid_));
arch_ = regs->Arch();
}
}
unwindstack::Elf* elf = map_info->GetElf(process_memory(), arch_);
std::string name;
uint64_t func_offset;
if (!elf->GetFunctionName(elf->GetRelPc(pc, map_info), &name, &func_offset)) {
return "";
}
*offset = func_offset;
return name;
}
std::shared_ptr<unwindstack::Memory> UnwindStackMap::GetProcessMemory() {
return process_memory_;
}
//-------------------------------------------------------------------------
// BacktraceMap create function.
//-------------------------------------------------------------------------
BacktraceMap* BacktraceMap::Create(pid_t pid, bool uncached) {
BacktraceMap* map;
if (uncached) {
// Force use of the base class to parse the maps when this call is made.
map = new BacktraceMap(pid);
} else if (pid == getpid()) {
map = new UnwindStackMap(0);
} else {
map = new UnwindStackMap(pid);
}
if (!map->Build()) {
delete map;
return nullptr;
}
return map;
}
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