Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2017 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 _GNU_SOURCE 1 |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 18 | #include <stdint.h> |
| 19 | #include <stdlib.h> |
| 20 | #include <string.h> |
| 21 | #include <ucontext.h> |
| 22 | |
| 23 | #include <memory> |
Christopher Ferris | f6f691b | 2017-09-25 19:23:07 -0700 | [diff] [blame] | 24 | #include <set> |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 25 | #include <string> |
| 26 | |
| 27 | #if !defined(__ANDROID__) |
| 28 | #include <cutils/threads.h> |
| 29 | #endif |
| 30 | |
| 31 | #include <backtrace/Backtrace.h> |
Christopher Ferris | 04fdec0 | 2017-08-11 15:17:46 -0700 | [diff] [blame] | 32 | #include <demangle.h> |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 33 | #include <unwindstack/Elf.h> |
| 34 | #include <unwindstack/MapInfo.h> |
| 35 | #include <unwindstack/Maps.h> |
| 36 | #include <unwindstack/Memory.h> |
| 37 | #include <unwindstack/Regs.h> |
| 38 | #include <unwindstack/RegsGetLocal.h> |
| 39 | |
Christopher Ferris | f6f691b | 2017-09-25 19:23:07 -0700 | [diff] [blame] | 40 | #include <unwindstack/Unwinder.h> |
| 41 | |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 42 | #include "BacktraceLog.h" |
| 43 | #include "UnwindStack.h" |
| 44 | #include "UnwindStackMap.h" |
| 45 | |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 46 | static std::string GetFunctionName(BacktraceMap* back_map, uintptr_t pc, uintptr_t* offset) { |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 47 | *offset = 0; |
| 48 | unwindstack::Maps* maps = reinterpret_cast<UnwindStackMap*>(back_map)->stack_maps(); |
| 49 | |
| 50 | // Get the map for this |
| 51 | unwindstack::MapInfo* map_info = maps->Find(pc); |
| 52 | if (map_info == nullptr || map_info->flags & PROT_DEVICE_MAP) { |
| 53 | return ""; |
| 54 | } |
| 55 | |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 56 | UnwindStackMap* stack_map = reinterpret_cast<UnwindStackMap*>(back_map); |
| 57 | unwindstack::Elf* elf = map_info->GetElf(stack_map->process_memory(), true); |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 58 | |
| 59 | std::string name; |
| 60 | uint64_t func_offset; |
| 61 | if (!elf->GetFunctionName(elf->GetRelPc(pc, map_info), &name, &func_offset)) { |
| 62 | return ""; |
| 63 | } |
| 64 | *offset = func_offset; |
| 65 | return name; |
| 66 | } |
| 67 | |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 68 | static bool Unwind(unwindstack::Regs* regs, BacktraceMap* back_map, |
| 69 | std::vector<backtrace_frame_data_t>* frames, size_t num_ignore_frames) { |
Christopher Ferris | f6f691b | 2017-09-25 19:23:07 -0700 | [diff] [blame] | 70 | static std::set<std::string> skip_names{"libunwindstack.so", "libbacktrace.so"}; |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 71 | UnwindStackMap* stack_map = reinterpret_cast<UnwindStackMap*>(back_map); |
Christopher Ferris | b9de87f | 2017-09-20 13:37:24 -0700 | [diff] [blame] | 72 | auto process_memory = stack_map->process_memory(); |
Christopher Ferris | f6f691b | 2017-09-25 19:23:07 -0700 | [diff] [blame] | 73 | unwindstack::Unwinder unwinder(MAX_BACKTRACE_FRAMES + num_ignore_frames, stack_map->stack_maps(), |
| 74 | regs, stack_map->process_memory()); |
| 75 | unwinder.Unwind(&skip_names); |
Christopher Ferris | b9de87f | 2017-09-20 13:37:24 -0700 | [diff] [blame] | 76 | |
Christopher Ferris | f6f691b | 2017-09-25 19:23:07 -0700 | [diff] [blame] | 77 | if (num_ignore_frames >= unwinder.NumFrames()) { |
| 78 | frames->resize(0); |
| 79 | return true; |
| 80 | } |
Christopher Ferris | b9de87f | 2017-09-20 13:37:24 -0700 | [diff] [blame] | 81 | |
Christopher Ferris | f6f691b | 2017-09-25 19:23:07 -0700 | [diff] [blame] | 82 | frames->resize(unwinder.NumFrames() - num_ignore_frames); |
| 83 | auto unwinder_frames = unwinder.frames(); |
| 84 | size_t cur_frame = 0; |
| 85 | for (size_t i = num_ignore_frames; i < unwinder.NumFrames(); i++, cur_frame++) { |
| 86 | auto frame = &unwinder_frames[i]; |
| 87 | backtrace_frame_data_t* back_frame = &frames->at(cur_frame); |
Christopher Ferris | b9de87f | 2017-09-20 13:37:24 -0700 | [diff] [blame] | 88 | |
Christopher Ferris | f6f691b | 2017-09-25 19:23:07 -0700 | [diff] [blame] | 89 | back_frame->num = frame->num; |
Christopher Ferris | b9de87f | 2017-09-20 13:37:24 -0700 | [diff] [blame] | 90 | |
Christopher Ferris | f6f691b | 2017-09-25 19:23:07 -0700 | [diff] [blame] | 91 | back_frame->rel_pc = frame->rel_pc; |
| 92 | back_frame->pc = frame->pc; |
| 93 | back_frame->sp = frame->sp; |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 94 | |
Christopher Ferris | 9a6b3e3 | 2017-10-18 09:08:51 -0700 | [diff] [blame^] | 95 | back_frame->func_name = demangle(frame->function_name.c_str()); |
Christopher Ferris | f6f691b | 2017-09-25 19:23:07 -0700 | [diff] [blame] | 96 | back_frame->func_offset = frame->function_offset; |
| 97 | |
| 98 | back_frame->map.name = frame->map_name; |
| 99 | back_frame->map.start = frame->map_start; |
| 100 | back_frame->map.end = frame->map_end; |
| 101 | back_frame->map.offset = frame->map_offset; |
| 102 | back_frame->map.load_bias = frame->map_load_bias; |
| 103 | back_frame->map.flags = frame->map_flags; |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | return true; |
| 107 | } |
| 108 | |
| 109 | UnwindStackCurrent::UnwindStackCurrent(pid_t pid, pid_t tid, BacktraceMap* map) |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 110 | : BacktraceCurrent(pid, tid, map) {} |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 111 | |
| 112 | std::string UnwindStackCurrent::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) { |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 113 | return ::GetFunctionName(GetMap(), pc, offset); |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | bool UnwindStackCurrent::UnwindFromContext(size_t num_ignore_frames, ucontext_t* ucontext) { |
| 117 | std::unique_ptr<unwindstack::Regs> regs; |
| 118 | if (ucontext == nullptr) { |
| 119 | regs.reset(unwindstack::Regs::CreateFromLocal()); |
| 120 | // Fill in the registers from this function. Do it here to avoid |
| 121 | // one extra function call appearing in the unwind. |
| 122 | unwindstack::RegsGetLocal(regs.get()); |
| 123 | } else { |
Josh Gao | 0953ecd | 2017-08-25 13:55:06 -0700 | [diff] [blame] | 124 | regs.reset( |
| 125 | unwindstack::Regs::CreateFromUcontext(unwindstack::Regs::CurrentMachineType(), ucontext)); |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 126 | } |
| 127 | |
| 128 | error_ = BACKTRACE_UNWIND_NO_ERROR; |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 129 | return ::Unwind(regs.get(), GetMap(), &frames_, num_ignore_frames); |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | UnwindStackPtrace::UnwindStackPtrace(pid_t pid, pid_t tid, BacktraceMap* map) |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 133 | : BacktracePtrace(pid, tid, map) {} |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 134 | |
| 135 | std::string UnwindStackPtrace::GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) { |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 136 | return ::GetFunctionName(GetMap(), pc, offset); |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | bool UnwindStackPtrace::Unwind(size_t num_ignore_frames, ucontext_t* context) { |
| 140 | std::unique_ptr<unwindstack::Regs> regs; |
| 141 | if (context == nullptr) { |
Josh Gao | 0953ecd | 2017-08-25 13:55:06 -0700 | [diff] [blame] | 142 | regs.reset(unwindstack::Regs::RemoteGet(Tid())); |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 143 | } else { |
Josh Gao | 0953ecd | 2017-08-25 13:55:06 -0700 | [diff] [blame] | 144 | regs.reset( |
| 145 | unwindstack::Regs::CreateFromUcontext(unwindstack::Regs::CurrentMachineType(), context)); |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 146 | } |
| 147 | |
| 148 | error_ = BACKTRACE_UNWIND_NO_ERROR; |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 149 | return ::Unwind(regs.get(), GetMap(), &frames_, num_ignore_frames); |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 150 | } |