| /* |
| * 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 <backtrace/BacktraceMap.h> |
| |
| #include <sys/types.h> |
| #include <string.h> |
| |
| #include <libunwind.h> |
| #include <libunwind-ptrace.h> |
| |
| #include "UnwindMap.h" |
| #include "UnwindPtrace.h" |
| |
| UnwindPtrace::UnwindPtrace() : addr_space_(NULL), upt_info_(NULL) { |
| } |
| |
| UnwindPtrace::~UnwindPtrace() { |
| if (upt_info_) { |
| _UPT_destroy(upt_info_); |
| upt_info_ = NULL; |
| } |
| if (addr_space_) { |
| // Remove the map from the address space before destroying it. |
| // It will be freed in the UnwindMap destructor. |
| unw_map_set(addr_space_, NULL); |
| |
| unw_destroy_addr_space(addr_space_); |
| addr_space_ = NULL; |
| } |
| } |
| |
| bool UnwindPtrace::Unwind(size_t num_ignore_frames) { |
| addr_space_ = unw_create_addr_space(&_UPT_accessors, 0); |
| if (!addr_space_) { |
| BACK_LOGW("unw_create_addr_space failed."); |
| return false; |
| } |
| |
| UnwindMap* map = static_cast<UnwindMap*>(GetMap()); |
| unw_map_set(addr_space_, map->GetMapCursor()); |
| |
| upt_info_ = reinterpret_cast<struct UPT_info*>(_UPT_create(Tid())); |
| if (!upt_info_) { |
| BACK_LOGW("Failed to create upt info."); |
| return false; |
| } |
| |
| unw_cursor_t cursor; |
| int ret = unw_init_remote(&cursor, addr_space_, upt_info_); |
| if (ret < 0) { |
| BACK_LOGW("unw_init_remote failed %d", ret); |
| return false; |
| } |
| |
| std::vector<backtrace_frame_data_t>* frames = GetFrames(); |
| frames->reserve(MAX_BACKTRACE_FRAMES); |
| size_t num_frames = 0; |
| do { |
| unw_word_t pc; |
| ret = unw_get_reg(&cursor, UNW_REG_IP, &pc); |
| if (ret < 0) { |
| BACK_LOGW("Failed to read IP %d", ret); |
| break; |
| } |
| unw_word_t sp; |
| ret = unw_get_reg(&cursor, UNW_REG_SP, &sp); |
| if (ret < 0) { |
| BACK_LOGW("Failed to read SP %d", ret); |
| break; |
| } |
| |
| if (num_ignore_frames == 0) { |
| frames->resize(num_frames+1); |
| backtrace_frame_data_t* frame = &frames->at(num_frames); |
| frame->num = num_frames; |
| frame->pc = static_cast<uintptr_t>(pc); |
| frame->sp = static_cast<uintptr_t>(sp); |
| frame->stack_size = 0; |
| |
| if (num_frames > 0) { |
| backtrace_frame_data_t* prev = &frames->at(num_frames-1); |
| prev->stack_size = frame->sp - prev->sp; |
| } |
| |
| frame->func_name = GetFunctionName(frame->pc, &frame->func_offset); |
| |
| frame->map = FindMap(frame->pc); |
| |
| num_frames++; |
| } else { |
| num_ignore_frames--; |
| } |
| ret = unw_step (&cursor); |
| } while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES); |
| |
| return true; |
| } |
| |
| std::string UnwindPtrace::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) { |
| *offset = 0; |
| char buf[512]; |
| unw_word_t value; |
| if (unw_get_proc_name_by_ip(addr_space_, pc, buf, sizeof(buf), &value, |
| upt_info_) >= 0 && buf[0] != '\0') { |
| *offset = static_cast<uintptr_t>(value); |
| return buf; |
| } |
| return ""; |
| } |
| |
| //------------------------------------------------------------------------- |
| // C++ object creation function. |
| //------------------------------------------------------------------------- |
| Backtrace* CreatePtraceObj(pid_t pid, pid_t tid, BacktraceMap* map) { |
| return new BacktracePtrace(new UnwindPtrace(), pid, tid, map); |
| } |