d11ed86d65
This refactors the step function slightly to split it up into distinct pieces since the code needs to handle a signal handler versus normal step slightly differently. Add a new error for an invalid elf. Modify libbacktrace code to handle new error code. Bug: 130302288 Test: libbacktrace/libunwindstack unit tests. Change-Id: I3fb9b00c02d2cf2cc5911541bba0346c6f39b8e6
145 lines
4.5 KiB
C++
145 lines
4.5 KiB
C++
/*
|
|
* Copyright (C) 2018 The Android Open Source Project
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <pthread.h>
|
|
#include <stdint.h>
|
|
|
|
#include <memory>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
#include <unwindstack/Elf.h>
|
|
#include <unwindstack/LocalUnwinder.h>
|
|
#include <unwindstack/MapInfo.h>
|
|
#include <unwindstack/Maps.h>
|
|
#include <unwindstack/Memory.h>
|
|
#include <unwindstack/Regs.h>
|
|
#include <unwindstack/RegsGetLocal.h>
|
|
|
|
namespace unwindstack {
|
|
|
|
bool LocalUnwinder::Init() {
|
|
pthread_rwlock_init(&maps_rwlock_, nullptr);
|
|
|
|
// Create the maps.
|
|
maps_.reset(new unwindstack::LocalUpdatableMaps());
|
|
if (!maps_->Parse()) {
|
|
maps_.reset();
|
|
return false;
|
|
}
|
|
|
|
process_memory_ = unwindstack::Memory::CreateProcessMemory(getpid());
|
|
|
|
return true;
|
|
}
|
|
|
|
bool LocalUnwinder::ShouldSkipLibrary(const std::string& map_name) {
|
|
for (const std::string& skip_library : skip_libraries_) {
|
|
if (skip_library == map_name) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
MapInfo* LocalUnwinder::GetMapInfo(uint64_t pc) {
|
|
pthread_rwlock_rdlock(&maps_rwlock_);
|
|
MapInfo* map_info = maps_->Find(pc);
|
|
pthread_rwlock_unlock(&maps_rwlock_);
|
|
|
|
if (map_info == nullptr) {
|
|
pthread_rwlock_wrlock(&maps_rwlock_);
|
|
// This is guaranteed not to invalidate any previous MapInfo objects so
|
|
// we don't need to worry about any MapInfo* values already in use.
|
|
if (maps_->Reparse()) {
|
|
map_info = maps_->Find(pc);
|
|
}
|
|
pthread_rwlock_unlock(&maps_rwlock_);
|
|
}
|
|
|
|
return map_info;
|
|
}
|
|
|
|
bool LocalUnwinder::Unwind(std::vector<LocalFrameData>* frame_info, size_t max_frames) {
|
|
std::unique_ptr<unwindstack::Regs> regs(unwindstack::Regs::CreateFromLocal());
|
|
unwindstack::RegsGetLocal(regs.get());
|
|
ArchEnum arch = regs->Arch();
|
|
|
|
size_t num_frames = 0;
|
|
bool adjust_pc = false;
|
|
while (true) {
|
|
uint64_t cur_pc = regs->pc();
|
|
uint64_t cur_sp = regs->sp();
|
|
|
|
MapInfo* map_info = GetMapInfo(cur_pc);
|
|
if (map_info == nullptr) {
|
|
break;
|
|
}
|
|
|
|
Elf* elf = map_info->GetElf(process_memory_, arch);
|
|
uint64_t rel_pc = elf->GetRelPc(cur_pc, map_info);
|
|
uint64_t step_pc = rel_pc;
|
|
uint64_t pc_adjustment;
|
|
if (adjust_pc) {
|
|
pc_adjustment = regs->GetPcAdjustment(rel_pc, elf);
|
|
} else {
|
|
pc_adjustment = 0;
|
|
}
|
|
step_pc -= pc_adjustment;
|
|
|
|
bool finished = false;
|
|
if (elf->StepIfSignalHandler(rel_pc, regs.get(), process_memory_.get())) {
|
|
step_pc = rel_pc;
|
|
} else if (!elf->Step(step_pc, regs.get(), process_memory_.get(), &finished)) {
|
|
finished = true;
|
|
}
|
|
|
|
// Skip any locations that are within this library.
|
|
if (num_frames != 0 || !ShouldSkipLibrary(map_info->name)) {
|
|
// Add frame information.
|
|
std::string func_name;
|
|
uint64_t func_offset;
|
|
if (elf->GetFunctionName(rel_pc, &func_name, &func_offset)) {
|
|
frame_info->emplace_back(map_info, cur_pc - pc_adjustment, rel_pc - pc_adjustment,
|
|
func_name, func_offset);
|
|
} else {
|
|
frame_info->emplace_back(map_info, cur_pc - pc_adjustment, rel_pc - pc_adjustment, "", 0);
|
|
}
|
|
num_frames++;
|
|
}
|
|
|
|
if (finished || frame_info->size() == max_frames ||
|
|
(cur_pc == regs->pc() && cur_sp == regs->sp())) {
|
|
break;
|
|
}
|
|
adjust_pc = true;
|
|
}
|
|
return num_frames != 0;
|
|
}
|
|
|
|
} // namespace unwindstack
|