Christopher Ferris | 7fb2287 | 2013-09-27 12:43:15 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #define LOG_TAG "libbacktrace" |
| 18 | |
| 19 | #include <string.h> |
| 20 | |
| 21 | #include <cutils/log.h> |
| 22 | #include <backtrace/backtrace.h> |
| 23 | |
| 24 | #include <corkscrew/backtrace.h> |
| 25 | |
| 26 | #define __USE_GNU |
| 27 | #include <dlfcn.h> |
| 28 | |
| 29 | #include "common.h" |
| 30 | #include "demangle.h" |
| 31 | |
| 32 | bool backtrace_get_data(backtrace_t* backtrace, pid_t tid) { |
| 33 | backtrace->num_frames = 0; |
| 34 | backtrace->tid = tid; |
| 35 | backtrace->private_data = NULL; |
| 36 | backtrace->map_info_list = backtrace_create_map_info_list(tid); |
| 37 | |
| 38 | backtrace_frame_t frames[MAX_BACKTRACE_FRAMES]; |
| 39 | ssize_t num_frames; |
| 40 | if (tid < 0) { |
| 41 | // Get data for the current thread. |
| 42 | num_frames = unwind_backtrace(frames, 0, MAX_BACKTRACE_FRAMES); |
| 43 | } else { |
| 44 | // Get data for a different thread. |
| 45 | ptrace_context_t* ptrace_context = load_ptrace_context(tid); |
| 46 | backtrace->private_data = ptrace_context; |
| 47 | |
| 48 | num_frames = unwind_backtrace_ptrace( |
| 49 | tid, ptrace_context, frames, 0, MAX_BACKTRACE_FRAMES); |
| 50 | } |
| 51 | if (num_frames < 0) { |
| 52 | ALOGW("backtrace_get_data: unwind_backtrace_ptrace failed %d\n", |
| 53 | num_frames); |
| 54 | backtrace_free_data(backtrace); |
| 55 | return false; |
| 56 | } |
| 57 | |
| 58 | backtrace->num_frames = num_frames; |
| 59 | backtrace_frame_data_t* frame; |
| 60 | uintptr_t map_start; |
| 61 | for (size_t i = 0; i < backtrace->num_frames; i++) { |
| 62 | frame = &backtrace->frames[i]; |
| 63 | frame->pc = frames[i].absolute_pc; |
| 64 | frame->sp = frames[i].stack_top; |
| 65 | frame->stack_size = frames[i].stack_size; |
| 66 | |
| 67 | frame->map_offset = 0; |
| 68 | frame->map_name = backtrace_get_map_info(backtrace, frame->pc, &map_start); |
| 69 | if (frame->map_name) { |
| 70 | frame->map_offset = frame->pc - map_start; |
| 71 | } |
| 72 | |
| 73 | frame->proc_offset = 0; |
| 74 | frame->proc_name = backtrace_get_proc_name(backtrace, frame->pc, &frame->proc_offset); |
| 75 | } |
| 76 | |
| 77 | return true; |
| 78 | } |
| 79 | |
| 80 | void backtrace_free_data(backtrace_t* backtrace) { |
| 81 | free_frame_data(backtrace); |
| 82 | |
| 83 | if (backtrace->map_info_list) { |
| 84 | backtrace_destroy_map_info_list(backtrace->map_info_list); |
| 85 | backtrace->map_info_list = NULL; |
| 86 | } |
| 87 | |
| 88 | if (backtrace->private_data) { |
| 89 | ptrace_context_t* ptrace_context = (ptrace_context_t*)backtrace->private_data; |
| 90 | free_ptrace_context(ptrace_context); |
| 91 | backtrace->private_data = NULL; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | char* backtrace_get_proc_name(const backtrace_t* backtrace, uintptr_t pc, |
| 96 | uintptr_t* offset) { |
| 97 | const char* symbol_name = NULL; |
| 98 | *offset = 0; |
| 99 | if (backtrace->tid < 0) { |
| 100 | // Get information about the current thread. |
| 101 | Dl_info info; |
| 102 | const backtrace_map_info_t* map_info; |
| 103 | map_info = backtrace_find_map_info(backtrace->map_info_list, pc); |
| 104 | if (map_info && dladdr((const void*)pc, &info) && info.dli_sname) { |
| 105 | *offset = pc - map_info->start - (uintptr_t)info.dli_saddr + (uintptr_t)info.dli_fbase; |
| 106 | symbol_name = info.dli_sname; |
| 107 | } |
| 108 | } else { |
| 109 | // Get information about a different thread. |
| 110 | ptrace_context_t* ptrace_context = (ptrace_context_t*)backtrace->private_data; |
| 111 | const map_info_t* map_info; |
| 112 | const symbol_t* symbol; |
| 113 | find_symbol_ptrace(ptrace_context, pc, &map_info, &symbol); |
| 114 | if (symbol) { |
| 115 | if (map_info) { |
| 116 | *offset = pc - map_info->start - symbol->start; |
| 117 | } |
| 118 | symbol_name = symbol->name; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | char* name = NULL; |
| 123 | if (symbol_name) { |
| 124 | name = demangle_symbol_name(symbol_name); |
| 125 | if (!name) { |
| 126 | name = strdup(symbol_name); |
| 127 | } |
| 128 | } |
| 129 | return name; |
| 130 | } |