| /* |
| * 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 <string.h> |
| |
| #include <log/log.h> |
| #include <backtrace/backtrace.h> |
| |
| #include <corkscrew/backtrace.h> |
| |
| #define __USE_GNU |
| #include <dlfcn.h> |
| |
| #include "common.h" |
| #include "demangle.h" |
| |
| bool backtrace_get_data(backtrace_t* backtrace, pid_t tid) { |
| backtrace->num_frames = 0; |
| backtrace->tid = tid; |
| backtrace->private_data = NULL; |
| backtrace->map_info_list = backtrace_create_map_info_list(tid); |
| |
| backtrace_frame_t frames[MAX_BACKTRACE_FRAMES]; |
| ssize_t num_frames; |
| if (tid < 0) { |
| // Get data for the current thread. |
| num_frames = unwind_backtrace(frames, 0, MAX_BACKTRACE_FRAMES); |
| } else { |
| // Get data for a different thread. |
| ptrace_context_t* ptrace_context = load_ptrace_context(tid); |
| backtrace->private_data = ptrace_context; |
| |
| num_frames = unwind_backtrace_ptrace( |
| tid, ptrace_context, frames, 0, MAX_BACKTRACE_FRAMES); |
| } |
| if (num_frames < 0) { |
| ALOGW("backtrace_get_data: unwind_backtrace_ptrace failed %d\n", |
| num_frames); |
| backtrace_free_data(backtrace); |
| return false; |
| } |
| |
| backtrace->num_frames = num_frames; |
| backtrace_frame_data_t* frame; |
| uintptr_t map_start; |
| for (size_t i = 0; i < backtrace->num_frames; i++) { |
| frame = &backtrace->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 = backtrace_get_map_info(backtrace, frame->pc, &map_start); |
| if (frame->map_name) { |
| frame->map_offset = frame->pc - map_start; |
| } |
| |
| frame->proc_offset = 0; |
| frame->proc_name = backtrace_get_proc_name(backtrace, frame->pc, &frame->proc_offset); |
| } |
| |
| return true; |
| } |
| |
| void backtrace_free_data(backtrace_t* backtrace) { |
| free_frame_data(backtrace); |
| |
| if (backtrace->map_info_list) { |
| backtrace_destroy_map_info_list(backtrace->map_info_list); |
| backtrace->map_info_list = NULL; |
| } |
| |
| if (backtrace->private_data) { |
| ptrace_context_t* ptrace_context = (ptrace_context_t*)backtrace->private_data; |
| free_ptrace_context(ptrace_context); |
| backtrace->private_data = NULL; |
| } |
| } |
| |
| char* backtrace_get_proc_name(const backtrace_t* backtrace, uintptr_t pc, |
| uintptr_t* offset) { |
| const char* symbol_name = NULL; |
| *offset = 0; |
| if (backtrace->tid < 0) { |
| // Get information about the current thread. |
| Dl_info info; |
| const backtrace_map_info_t* map_info; |
| map_info = backtrace_find_map_info(backtrace->map_info_list, pc); |
| 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; |
| } |
| } else { |
| // Get information about a different thread. |
| ptrace_context_t* ptrace_context = (ptrace_context_t*)backtrace->private_data; |
| const map_info_t* map_info; |
| const symbol_t* symbol; |
| find_symbol_ptrace(ptrace_context, pc, &map_info, &symbol); |
| if (symbol) { |
| if (map_info) { |
| *offset = pc - map_info->start - symbol->start; |
| } |
| symbol_name = symbol->name; |
| } |
| } |
| |
| char* name = NULL; |
| if (symbol_name) { |
| name = demangle_symbol_name(symbol_name); |
| if (!name) { |
| name = strdup(symbol_name); |
| } |
| } |
| return name; |
| } |