Christopher Ferris | 17e91d4 | 2013-10-21 13:30:52 -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 <backtrace/backtrace.h> |
| 20 | |
| 21 | #include <string.h> |
| 22 | |
| 23 | #include <backtrace-arch.h> |
| 24 | #include <cutils/log.h> |
| 25 | #include <corkscrew/backtrace.h> |
| 26 | |
| 27 | #ifndef __USE_GNU |
| 28 | #define __USE_GNU |
| 29 | #endif |
| 30 | #include <dlfcn.h> |
| 31 | |
| 32 | #include "Corkscrew.h" |
| 33 | |
| 34 | //------------------------------------------------------------------------- |
| 35 | // CorkscrewCommon functions. |
| 36 | //------------------------------------------------------------------------- |
| 37 | bool CorkscrewCommon::GenerateFrameData( |
| 38 | backtrace_frame_t* cork_frames, ssize_t num_frames) { |
| 39 | if (num_frames < 0) { |
Christopher Ferris | 8ed4627 | 2013-10-29 15:44:25 -0700 | [diff] [blame] | 40 | BACK_LOGW("libcorkscrew unwind failed."); |
Christopher Ferris | 17e91d4 | 2013-10-21 13:30:52 -0700 | [diff] [blame] | 41 | return false; |
| 42 | } |
| 43 | |
| 44 | backtrace_t* data = GetBacktraceData(); |
| 45 | data->num_frames = num_frames; |
| 46 | for (size_t i = 0; i < data->num_frames; i++) { |
| 47 | backtrace_frame_data_t* frame = &data->frames[i]; |
| 48 | frame->pc = cork_frames[i].absolute_pc; |
| 49 | frame->sp = cork_frames[i].stack_top; |
| 50 | frame->stack_size = cork_frames[i].stack_size; |
| 51 | frame->map_name = NULL; |
| 52 | frame->map_offset = 0; |
| 53 | frame->func_name = NULL; |
| 54 | frame->func_offset = 0; |
| 55 | |
| 56 | uintptr_t map_start; |
| 57 | frame->map_name = backtrace_obj_->GetMapName(frame->pc, &map_start); |
| 58 | if (frame->map_name) { |
| 59 | frame->map_offset = frame->pc - map_start; |
| 60 | } |
| 61 | |
| 62 | std::string func_name = backtrace_obj_->GetFunctionName(frame->pc, &frame->func_offset); |
| 63 | if (!func_name.empty()) { |
| 64 | frame->func_name = strdup(func_name.c_str()); |
| 65 | } |
| 66 | } |
| 67 | return true; |
| 68 | } |
| 69 | |
| 70 | //------------------------------------------------------------------------- |
| 71 | // CorkscrewCurrent functions. |
| 72 | //------------------------------------------------------------------------- |
| 73 | CorkscrewCurrent::CorkscrewCurrent() { |
| 74 | } |
| 75 | |
| 76 | CorkscrewCurrent::~CorkscrewCurrent() { |
| 77 | } |
| 78 | |
| 79 | bool CorkscrewCurrent::Unwind(size_t num_ignore_frames) { |
| 80 | backtrace_frame_t frames[MAX_BACKTRACE_FRAMES]; |
| 81 | ssize_t num_frames = unwind_backtrace(frames, num_ignore_frames, MAX_BACKTRACE_FRAMES); |
| 82 | |
| 83 | return GenerateFrameData(frames, num_frames); |
| 84 | } |
| 85 | |
| 86 | std::string CorkscrewCurrent::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) { |
| 87 | *offset = 0; |
| 88 | |
Christopher Ferris | 17e91d4 | 2013-10-21 13:30:52 -0700 | [diff] [blame] | 89 | Dl_info info; |
| 90 | const backtrace_map_info_t* map_info = backtrace_obj_->FindMapInfo(pc); |
Christopher Ferris | 923b536 | 2013-11-04 14:38:07 -0800 | [diff] [blame] | 91 | if (map_info) { |
| 92 | if (dladdr((const void*)pc, &info)) { |
| 93 | if (info.dli_sname) { |
| 94 | *offset = pc - map_info->start - (uintptr_t)info.dli_saddr + (uintptr_t)info.dli_fbase; |
| 95 | return info.dli_sname; |
| 96 | } |
| 97 | } else { |
| 98 | // dladdr(3) didn't find a symbol; maybe it's static? Look in the ELF file... |
| 99 | symbol_table_t* symbol_table = load_symbol_table(map_info->name); |
| 100 | if (symbol_table) { |
| 101 | // First check if we can find the symbol using a relative pc. |
| 102 | std::string name; |
| 103 | const symbol_t* elf_symbol = find_symbol(symbol_table, pc - map_info->start); |
| 104 | if (elf_symbol) { |
| 105 | name = elf_symbol->name; |
| 106 | *offset = pc - map_info->start - elf_symbol->start; |
| 107 | } else if ((elf_symbol = find_symbol(symbol_table, pc)) != NULL) { |
| 108 | // Found the symbol using the absolute pc. |
| 109 | name = elf_symbol->name; |
| 110 | *offset = pc - elf_symbol->start; |
| 111 | } |
| 112 | free_symbol_table(symbol_table); |
| 113 | return name; |
| 114 | } |
| 115 | } |
Christopher Ferris | 17e91d4 | 2013-10-21 13:30:52 -0700 | [diff] [blame] | 116 | } |
| 117 | return ""; |
| 118 | } |
| 119 | |
| 120 | //------------------------------------------------------------------------- |
| 121 | // CorkscrewThread functions. |
| 122 | //------------------------------------------------------------------------- |
| 123 | CorkscrewThread::CorkscrewThread() { |
| 124 | } |
| 125 | |
| 126 | CorkscrewThread::~CorkscrewThread() { |
| 127 | if (corkscrew_map_info_) { |
| 128 | free_map_info_list(corkscrew_map_info_); |
| 129 | corkscrew_map_info_ = NULL; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | bool CorkscrewThread::Init() { |
| 134 | corkscrew_map_info_ = load_map_info_list(backtrace_obj_->Pid()); |
| 135 | return corkscrew_map_info_ != NULL; |
| 136 | } |
| 137 | |
| 138 | void CorkscrewThread::ThreadUnwind( |
| 139 | siginfo_t* siginfo, void* sigcontext, size_t num_ignore_frames) { |
| 140 | backtrace_frame_t frames[MAX_BACKTRACE_FRAMES]; |
| 141 | ssize_t num_frames = unwind_backtrace_signal_arch( |
| 142 | siginfo, sigcontext, corkscrew_map_info_, frames, num_ignore_frames, |
| 143 | MAX_BACKTRACE_FRAMES); |
| 144 | if (num_frames > 0) { |
| 145 | backtrace_t* data = GetBacktraceData(); |
| 146 | data->num_frames = num_frames; |
| 147 | for (size_t i = 0; i < data->num_frames; i++) { |
| 148 | backtrace_frame_data_t* frame = &data->frames[i]; |
| 149 | frame->pc = frames[i].absolute_pc; |
| 150 | frame->sp = frames[i].stack_top; |
| 151 | frame->stack_size = frames[i].stack_size; |
| 152 | |
| 153 | frame->map_offset = 0; |
| 154 | frame->map_name = NULL; |
| 155 | frame->map_offset = 0; |
| 156 | |
| 157 | frame->func_offset = 0; |
| 158 | frame->func_name = NULL; |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | //------------------------------------------------------------------------- |
| 164 | // CorkscrewPtrace functions. |
| 165 | //------------------------------------------------------------------------- |
| 166 | CorkscrewPtrace::CorkscrewPtrace() : ptrace_context_(NULL) { |
| 167 | } |
| 168 | |
| 169 | CorkscrewPtrace::~CorkscrewPtrace() { |
| 170 | if (ptrace_context_) { |
| 171 | free_ptrace_context(ptrace_context_); |
| 172 | ptrace_context_ = NULL; |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | bool CorkscrewPtrace::Unwind(size_t num_ignore_frames) { |
| 177 | ptrace_context_ = load_ptrace_context(backtrace_obj_->Tid()); |
| 178 | |
| 179 | backtrace_frame_t frames[MAX_BACKTRACE_FRAMES]; |
| 180 | ssize_t num_frames = unwind_backtrace_ptrace( |
| 181 | backtrace_obj_->Tid(), ptrace_context_, frames, num_ignore_frames, |
| 182 | MAX_BACKTRACE_FRAMES); |
| 183 | |
| 184 | return GenerateFrameData(frames, num_frames); |
| 185 | } |
| 186 | |
| 187 | std::string CorkscrewPtrace::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) { |
| 188 | // Get information about a different process. |
| 189 | const map_info_t* map_info; |
| 190 | const symbol_t* symbol; |
| 191 | find_symbol_ptrace(ptrace_context_, pc, &map_info, &symbol); |
| 192 | char* symbol_name = NULL; |
| 193 | if (symbol) { |
| 194 | if (map_info) { |
| 195 | *offset = pc - map_info->start - symbol->start; |
| 196 | } |
| 197 | symbol_name = symbol->name; |
| 198 | return symbol_name; |
| 199 | } |
| 200 | |
| 201 | return ""; |
| 202 | } |
| 203 | |
| 204 | //------------------------------------------------------------------------- |
Christopher Ferris | 8ed4627 | 2013-10-29 15:44:25 -0700 | [diff] [blame] | 205 | // C++ object creation functions. |
Christopher Ferris | 17e91d4 | 2013-10-21 13:30:52 -0700 | [diff] [blame] | 206 | //------------------------------------------------------------------------- |
Christopher Ferris | 9846497 | 2014-01-06 19:16:33 -0800 | [diff] [blame] | 207 | Backtrace* CreateCurrentObj(backtrace_map_info_t* map_info) { |
| 208 | return new BacktraceCurrent(new CorkscrewCurrent(), map_info); |
Christopher Ferris | 17e91d4 | 2013-10-21 13:30:52 -0700 | [diff] [blame] | 209 | } |
| 210 | |
Christopher Ferris | 9846497 | 2014-01-06 19:16:33 -0800 | [diff] [blame] | 211 | Backtrace* CreatePtraceObj(pid_t pid, pid_t tid, backtrace_map_info_t* map_info) { |
| 212 | return new BacktracePtrace(new CorkscrewPtrace(), pid, tid, map_info); |
Christopher Ferris | 17e91d4 | 2013-10-21 13:30:52 -0700 | [diff] [blame] | 213 | } |
| 214 | |
Christopher Ferris | 9846497 | 2014-01-06 19:16:33 -0800 | [diff] [blame] | 215 | Backtrace* CreateThreadObj(pid_t tid, backtrace_map_info_t* map_info) { |
Christopher Ferris | 17e91d4 | 2013-10-21 13:30:52 -0700 | [diff] [blame] | 216 | CorkscrewThread* thread_obj = new CorkscrewThread(); |
Christopher Ferris | 9846497 | 2014-01-06 19:16:33 -0800 | [diff] [blame] | 217 | return new BacktraceThread(thread_obj, thread_obj, tid, map_info); |
Christopher Ferris | 17e91d4 | 2013-10-21 13:30:52 -0700 | [diff] [blame] | 218 | } |