| /* |
| * 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; |
| |
| Dl_info info; |
| const backtrace_map_info_t* map_info = backtrace_obj_->FindMapInfo(pc); |
| if (map_info) { |
| if (dladdr((const void*)pc, &info)) { |
| if (info.dli_sname) { |
| *offset = pc - map_info->start - (uintptr_t)info.dli_saddr + (uintptr_t)info.dli_fbase; |
| return info.dli_sname; |
| } |
| } else { |
| // dladdr(3) didn't find a symbol; maybe it's static? Look in the ELF file... |
| symbol_table_t* symbol_table = load_symbol_table(map_info->name); |
| if (symbol_table) { |
| // First check if we can find the symbol using a relative pc. |
| std::string name; |
| const symbol_t* elf_symbol = find_symbol(symbol_table, pc - map_info->start); |
| if (elf_symbol) { |
| name = elf_symbol->name; |
| *offset = pc - map_info->start - elf_symbol->start; |
| } else if ((elf_symbol = find_symbol(symbol_table, pc)) != NULL) { |
| // Found the symbol using the absolute pc. |
| name = elf_symbol->name; |
| *offset = pc - elf_symbol->start; |
| } |
| free_symbol_table(symbol_table); |
| return 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); |
| } |