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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.
*/
#define _GNU_SOURCE 1
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <memory>
#include <set>
#include <string>
#include <backtrace/Backtrace.h>
#include <unwindstack/Elf.h>
#include <unwindstack/MapInfo.h>
#include <unwindstack/Maps.h>
#include <unwindstack/Memory.h>
#include <unwindstack/Regs.h>
#include <unwindstack/RegsGetLocal.h>
#if !defined(NO_LIBDEXFILE_SUPPORT)
#include <unwindstack/DexFiles.h>
#endif
#include <unwindstack/Unwinder.h>
#include "BacktraceLog.h"
#include "UnwindStack.h"
#include "UnwindStackMap.h"
extern "C" char* __cxa_demangle(const char*, char*, size_t*, int*);
bool Backtrace::Unwind(unwindstack::Regs* regs, BacktraceMap* back_map,
std::vector<backtrace_frame_data_t>* frames, size_t num_ignore_frames,
std::vector<std::string>* skip_names, BacktraceUnwindError* error) {
UnwindStackMap* stack_map = reinterpret_cast<UnwindStackMap*>(back_map);
auto process_memory = stack_map->process_memory();
unwindstack::Unwinder unwinder(MAX_BACKTRACE_FRAMES + num_ignore_frames, stack_map->stack_maps(),
regs, stack_map->process_memory());
unwinder.SetResolveNames(stack_map->ResolveNames());
stack_map->SetArch(regs->Arch());
if (stack_map->GetJitDebug() != nullptr) {
unwinder.SetJitDebug(stack_map->GetJitDebug(), regs->Arch());
}
#if !defined(NO_LIBDEXFILE_SUPPORT)
if (stack_map->GetDexFiles() != nullptr) {
unwinder.SetDexFiles(stack_map->GetDexFiles(), regs->Arch());
}
#endif
unwinder.Unwind(skip_names, &stack_map->GetSuffixesToIgnore());
if (error != nullptr) {
switch (unwinder.LastErrorCode()) {
case unwindstack::ERROR_NONE:
error->error_code = BACKTRACE_UNWIND_NO_ERROR;
break;
case unwindstack::ERROR_MEMORY_INVALID:
error->error_code = BACKTRACE_UNWIND_ERROR_ACCESS_MEM_FAILED;
error->error_info.addr = unwinder.LastErrorAddress();
break;
case unwindstack::ERROR_UNWIND_INFO:
error->error_code = BACKTRACE_UNWIND_ERROR_UNWIND_INFO;
break;
case unwindstack::ERROR_UNSUPPORTED:
error->error_code = BACKTRACE_UNWIND_ERROR_UNSUPPORTED_OPERATION;
break;
case unwindstack::ERROR_INVALID_MAP:
error->error_code = BACKTRACE_UNWIND_ERROR_MAP_MISSING;
break;
case unwindstack::ERROR_MAX_FRAMES_EXCEEDED:
error->error_code = BACKTRACE_UNWIND_ERROR_EXCEED_MAX_FRAMES_LIMIT;
break;
case unwindstack::ERROR_REPEATED_FRAME:
error->error_code = BACKTRACE_UNWIND_ERROR_REPEATED_FRAME;
break;
case unwindstack::ERROR_INVALID_ELF:
error->error_code = BACKTRACE_UNWIND_ERROR_INVALID_ELF;
break;
}
}
if (num_ignore_frames >= unwinder.NumFrames()) {
frames->resize(0);
return true;
}
auto unwinder_frames = unwinder.frames();
frames->resize(unwinder.NumFrames() - num_ignore_frames);
size_t cur_frame = 0;
for (size_t i = num_ignore_frames; i < unwinder.NumFrames(); i++) {
auto frame = &unwinder_frames[i];
backtrace_frame_data_t* back_frame = &frames->at(cur_frame);
back_frame->num = cur_frame++;
back_frame->rel_pc = frame->rel_pc;
back_frame->pc = frame->pc;
back_frame->sp = frame->sp;
char* demangled_name = __cxa_demangle(frame->function_name.c_str(), nullptr, nullptr, nullptr);
if (demangled_name != nullptr) {
back_frame->func_name = demangled_name;
free(demangled_name);
} else {
back_frame->func_name = frame->function_name;
}
back_frame->func_offset = frame->function_offset;
back_frame->map.name = frame->map_name;
back_frame->map.start = frame->map_start;
back_frame->map.end = frame->map_end;
back_frame->map.offset = frame->map_elf_start_offset;
back_frame->map.load_bias = frame->map_load_bias;
back_frame->map.flags = frame->map_flags;
}
return true;
}
UnwindStackCurrent::UnwindStackCurrent(pid_t pid, pid_t tid, BacktraceMap* map)
: BacktraceCurrent(pid, tid, map) {}
std::string UnwindStackCurrent::GetFunctionNameRaw(uint64_t pc, uint64_t* offset) {
return GetMap()->GetFunctionName(pc, offset);
}
bool UnwindStackCurrent::UnwindFromContext(size_t num_ignore_frames, void* ucontext) {
std::unique_ptr<unwindstack::Regs> regs;
if (ucontext == nullptr) {
regs.reset(unwindstack::Regs::CreateFromLocal());
// Fill in the registers from this function. Do it here to avoid
// one extra function call appearing in the unwind.
unwindstack::RegsGetLocal(regs.get());
} else {
regs.reset(unwindstack::Regs::CreateFromUcontext(unwindstack::Regs::CurrentArch(), ucontext));
}
std::vector<std::string> skip_names{"libunwindstack.so", "libbacktrace.so"};
if (!skip_frames_) {
skip_names.clear();
}
return Backtrace::Unwind(regs.get(), GetMap(), &frames_, num_ignore_frames, &skip_names, &error_);
}
UnwindStackPtrace::UnwindStackPtrace(pid_t pid, pid_t tid, BacktraceMap* map)
: BacktracePtrace(pid, tid, map), memory_(unwindstack::Memory::CreateProcessMemory(pid)) {}
std::string UnwindStackPtrace::GetFunctionNameRaw(uint64_t pc, uint64_t* offset) {
return GetMap()->GetFunctionName(pc, offset);
}
bool UnwindStackPtrace::Unwind(size_t num_ignore_frames, void* context) {
std::unique_ptr<unwindstack::Regs> regs;
if (context == nullptr) {
regs.reset(unwindstack::Regs::RemoteGet(Tid()));
} else {
regs.reset(unwindstack::Regs::CreateFromUcontext(unwindstack::Regs::CurrentArch(), context));
}
return Backtrace::Unwind(regs.get(), GetMap(), &frames_, num_ignore_frames, nullptr, &error_);
}
size_t UnwindStackPtrace::Read(uint64_t addr, uint8_t* buffer, size_t bytes) {
return memory_->Read(addr, buffer, bytes);
}
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