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/*
* Copyright (C) 2013 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 LOG_TAG "libbacktrace"
#include <backtrace/backtrace.h>
#include <string.h>
#include <backtrace-arch.h>
#include <cutils/log.h>
#include <corkscrew/backtrace.h>
#ifndef __USE_GNU
#define __USE_GNU
#endif
#include <dlfcn.h>
#include "Corkscrew.h"
//-------------------------------------------------------------------------
// CorkscrewCommon functions.
//-------------------------------------------------------------------------
bool CorkscrewCommon::GenerateFrameData(
backtrace_frame_t* cork_frames, ssize_t num_frames) {
if (num_frames < 0) {
BACK_LOGW("libcorkscrew unwind failed.");
return false;
}
backtrace_t* data = GetBacktraceData();
data->num_frames = num_frames;
for (size_t i = 0; i < data->num_frames; i++) {
backtrace_frame_data_t* frame = &data->frames[i];
frame->pc = cork_frames[i].absolute_pc;
frame->sp = cork_frames[i].stack_top;
frame->stack_size = cork_frames[i].stack_size;
frame->map_name = NULL;
frame->map_offset = 0;
frame->func_name = NULL;
frame->func_offset = 0;
uintptr_t map_start;
frame->map_name = backtrace_obj_->GetMapName(frame->pc, &map_start);
if (frame->map_name) {
frame->map_offset = frame->pc - map_start;
}
std::string func_name = backtrace_obj_->GetFunctionName(frame->pc, &frame->func_offset);
if (!func_name.empty()) {
frame->func_name = strdup(func_name.c_str());
}
}
return true;
}
//-------------------------------------------------------------------------
// CorkscrewCurrent functions.
//-------------------------------------------------------------------------
CorkscrewCurrent::CorkscrewCurrent() {
}
CorkscrewCurrent::~CorkscrewCurrent() {
}
bool CorkscrewCurrent::Unwind(size_t num_ignore_frames) {
backtrace_frame_t frames[MAX_BACKTRACE_FRAMES];
ssize_t num_frames = unwind_backtrace(frames, num_ignore_frames, MAX_BACKTRACE_FRAMES);
return GenerateFrameData(frames, num_frames);
}
std::string CorkscrewCurrent::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
*offset = 0;
// Get information about the current thread.
Dl_info info;
const backtrace_map_info_t* map_info = backtrace_obj_->FindMapInfo(pc);
const char* symbol_name = NULL;
if (map_info && dladdr((const void*)pc, &info) && info.dli_sname) {
*offset = pc - map_info->start - (uintptr_t)info.dli_saddr + (uintptr_t)info.dli_fbase;
symbol_name = info.dli_sname;
return symbol_name;
}
return "";
}
//-------------------------------------------------------------------------
// CorkscrewThread functions.
//-------------------------------------------------------------------------
CorkscrewThread::CorkscrewThread() {
}
CorkscrewThread::~CorkscrewThread() {
if (corkscrew_map_info_) {
free_map_info_list(corkscrew_map_info_);
corkscrew_map_info_ = NULL;
}
}
bool CorkscrewThread::Init() {
corkscrew_map_info_ = load_map_info_list(backtrace_obj_->Pid());
return corkscrew_map_info_ != NULL;
}
void CorkscrewThread::ThreadUnwind(
siginfo_t* siginfo, void* sigcontext, size_t num_ignore_frames) {
backtrace_frame_t frames[MAX_BACKTRACE_FRAMES];
ssize_t num_frames = unwind_backtrace_signal_arch(
siginfo, sigcontext, corkscrew_map_info_, frames, num_ignore_frames,
MAX_BACKTRACE_FRAMES);
if (num_frames > 0) {
backtrace_t* data = GetBacktraceData();
data->num_frames = num_frames;
for (size_t i = 0; i < data->num_frames; i++) {
backtrace_frame_data_t* frame = &data->frames[i];
frame->pc = frames[i].absolute_pc;
frame->sp = frames[i].stack_top;
frame->stack_size = frames[i].stack_size;
frame->map_offset = 0;
frame->map_name = NULL;
frame->map_offset = 0;
frame->func_offset = 0;
frame->func_name = NULL;
}
}
}
//-------------------------------------------------------------------------
// CorkscrewPtrace functions.
//-------------------------------------------------------------------------
CorkscrewPtrace::CorkscrewPtrace() : ptrace_context_(NULL) {
}
CorkscrewPtrace::~CorkscrewPtrace() {
if (ptrace_context_) {
free_ptrace_context(ptrace_context_);
ptrace_context_ = NULL;
}
}
bool CorkscrewPtrace::Unwind(size_t num_ignore_frames) {
ptrace_context_ = load_ptrace_context(backtrace_obj_->Tid());
backtrace_frame_t frames[MAX_BACKTRACE_FRAMES];
ssize_t num_frames = unwind_backtrace_ptrace(
backtrace_obj_->Tid(), ptrace_context_, frames, num_ignore_frames,
MAX_BACKTRACE_FRAMES);
return GenerateFrameData(frames, num_frames);
}
std::string CorkscrewPtrace::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) {
// Get information about a different process.
const map_info_t* map_info;
const symbol_t* symbol;
find_symbol_ptrace(ptrace_context_, pc, &map_info, &symbol);
char* symbol_name = NULL;
if (symbol) {
if (map_info) {
*offset = pc - map_info->start - symbol->start;
}
symbol_name = symbol->name;
return symbol_name;
}
return "";
}
//-------------------------------------------------------------------------
// C++ object creation functions.
//-------------------------------------------------------------------------
Backtrace* CreateCurrentObj() {
return new BacktraceCurrent(new CorkscrewCurrent());
}
Backtrace* CreatePtraceObj(pid_t pid, pid_t tid) {
return new BacktracePtrace(new CorkscrewPtrace(), pid, tid);
}
Backtrace* CreateThreadObj(pid_t tid) {
CorkscrewThread* thread_obj = new CorkscrewThread();
return new BacktraceThread(thread_obj, thread_obj, tid);
}
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