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 | #include <stdint.h> |
| 18 | #include <stdlib.h> |
| 19 | #include <sys/types.h> |
| 20 | |
Christopher Ferris | 150db12 | 2017-12-20 18:49:01 -0800 | [diff] [blame] | 21 | #include <string> |
| 22 | #include <vector> |
| 23 | |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 24 | #include <backtrace/BacktraceMap.h> |
| 25 | #include <unwindstack/Elf.h> |
| 26 | #include <unwindstack/MapInfo.h> |
| 27 | #include <unwindstack/Maps.h> |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 28 | #include <unwindstack/Regs.h> |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 29 | |
| 30 | #include "UnwindStackMap.h" |
| 31 | |
| 32 | //------------------------------------------------------------------------- |
| 33 | UnwindStackMap::UnwindStackMap(pid_t pid) : BacktraceMap(pid) {} |
| 34 | |
| 35 | bool UnwindStackMap::Build() { |
| 36 | if (pid_ == 0) { |
| 37 | pid_ = getpid(); |
| 38 | stack_maps_.reset(new unwindstack::LocalMaps); |
| 39 | } else { |
| 40 | stack_maps_.reset(new unwindstack::RemoteMaps(pid_)); |
| 41 | } |
| 42 | |
Christopher Ferris | 5f11851 | 2017-09-01 11:17:16 -0700 | [diff] [blame] | 43 | // Create the process memory object. |
| 44 | process_memory_ = unwindstack::Memory::CreateProcessMemory(pid_); |
| 45 | |
David Srbecky | b9cc4fb | 2019-04-05 18:23:32 +0000 | [diff] [blame] | 46 | // Create a JitDebug object for getting jit unwind information. |
| 47 | std::vector<std::string> search_libs_{"libart.so", "libartd.so"}; |
| 48 | jit_debug_.reset(new unwindstack::JitDebug(process_memory_, search_libs_)); |
| 49 | #if !defined(NO_LIBDEXFILE_SUPPORT) |
| 50 | dex_files_.reset(new unwindstack::DexFiles(process_memory_, search_libs_)); |
| 51 | #endif |
| 52 | |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 53 | if (!stack_maps_->Parse()) { |
| 54 | return false; |
| 55 | } |
| 56 | |
| 57 | // Iterate through the maps and fill in the backtrace_map_t structure. |
Florian Mayer | 3d67d34 | 2019-02-27 18:00:37 +0000 | [diff] [blame] | 58 | for (const auto& map_info : *stack_maps_) { |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 59 | backtrace_map_t map; |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 60 | map.start = map_info->start; |
| 61 | map.end = map_info->end; |
| 62 | map.offset = map_info->offset; |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 63 | // Set to -1 so that it is demand loaded. |
Christopher Ferris | 7937a36 | 2018-01-18 11:15:49 -0800 | [diff] [blame] | 64 | map.load_bias = static_cast<uint64_t>(-1); |
Christopher Ferris | be788d8 | 2017-11-27 14:50:38 -0800 | [diff] [blame] | 65 | map.flags = map_info->flags; |
| 66 | map.name = map_info->name; |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 67 | |
| 68 | maps_.push_back(map); |
| 69 | } |
| 70 | |
| 71 | return true; |
| 72 | } |
| 73 | |
Christopher Ferris | 7937a36 | 2018-01-18 11:15:49 -0800 | [diff] [blame] | 74 | void UnwindStackMap::FillIn(uint64_t addr, backtrace_map_t* map) { |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 75 | BacktraceMap::FillIn(addr, map); |
Christopher Ferris | 7937a36 | 2018-01-18 11:15:49 -0800 | [diff] [blame] | 76 | if (map->load_bias != static_cast<uint64_t>(-1)) { |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 77 | return; |
| 78 | } |
| 79 | |
| 80 | // Fill in the load_bias. |
| 81 | unwindstack::MapInfo* map_info = stack_maps_->Find(addr); |
| 82 | if (map_info == nullptr) { |
| 83 | return; |
| 84 | } |
Christopher Ferris | b7de5f5 | 2017-12-01 21:37:37 -0800 | [diff] [blame] | 85 | map->load_bias = map_info->GetLoadBias(process_memory_); |
| 86 | } |
| 87 | |
| 88 | uint64_t UnwindStackMap::GetLoadBias(size_t index) { |
| 89 | if (index >= stack_maps_->Total()) { |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | unwindstack::MapInfo* map_info = stack_maps_->Get(index); |
| 94 | if (map_info == nullptr) { |
| 95 | return 0; |
| 96 | } |
| 97 | return map_info->GetLoadBias(process_memory_); |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 98 | } |
| 99 | |
Christopher Ferris | 7937a36 | 2018-01-18 11:15:49 -0800 | [diff] [blame] | 100 | std::string UnwindStackMap::GetFunctionName(uint64_t pc, uint64_t* offset) { |
Josh Gao | 358de18 | 2017-09-06 22:16:09 -0700 | [diff] [blame] | 101 | *offset = 0; |
| 102 | unwindstack::Maps* maps = stack_maps(); |
| 103 | |
| 104 | // Get the map for this |
| 105 | unwindstack::MapInfo* map_info = maps->Find(pc); |
| 106 | if (map_info == nullptr || map_info->flags & PROT_DEVICE_MAP) { |
| 107 | return ""; |
| 108 | } |
| 109 | |
Christopher Ferris | 4568f4b | 2018-10-23 17:42:41 -0700 | [diff] [blame] | 110 | if (arch_ == unwindstack::ARCH_UNKNOWN) { |
| 111 | if (pid_ == getpid()) { |
| 112 | arch_ = unwindstack::Regs::CurrentArch(); |
| 113 | } else { |
| 114 | // Create a remote regs, to figure out the architecture. |
| 115 | std::unique_ptr<unwindstack::Regs> regs(unwindstack::Regs::RemoteGet(pid_)); |
| 116 | arch_ = regs->Arch(); |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | unwindstack::Elf* elf = map_info->GetElf(process_memory(), arch_); |
Josh Gao | 358de18 | 2017-09-06 22:16:09 -0700 | [diff] [blame] | 121 | |
| 122 | std::string name; |
| 123 | uint64_t func_offset; |
| 124 | if (!elf->GetFunctionName(elf->GetRelPc(pc, map_info), &name, &func_offset)) { |
| 125 | return ""; |
| 126 | } |
| 127 | *offset = func_offset; |
| 128 | return name; |
| 129 | } |
| 130 | |
Josh Gao | ebea0ef | 2017-09-06 15:39:14 -0700 | [diff] [blame] | 131 | std::shared_ptr<unwindstack::Memory> UnwindStackMap::GetProcessMemory() { |
| 132 | return process_memory_; |
| 133 | } |
| 134 | |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 135 | //------------------------------------------------------------------------- |
| 136 | // BacktraceMap create function. |
| 137 | //------------------------------------------------------------------------- |
Christopher Ferris | 086baf9 | 2017-10-17 14:12:52 -0700 | [diff] [blame] | 138 | BacktraceMap* BacktraceMap::Create(pid_t pid, bool uncached) { |
Christopher Ferris | 6f3981c | 2017-07-27 09:29:18 -0700 | [diff] [blame] | 139 | BacktraceMap* map; |
| 140 | |
| 141 | if (uncached) { |
| 142 | // Force use of the base class to parse the maps when this call is made. |
| 143 | map = new BacktraceMap(pid); |
| 144 | } else if (pid == getpid()) { |
| 145 | map = new UnwindStackMap(0); |
| 146 | } else { |
| 147 | map = new UnwindStackMap(pid); |
| 148 | } |
| 149 | if (!map->Build()) { |
| 150 | delete map; |
| 151 | return nullptr; |
| 152 | } |
| 153 | return map; |
| 154 | } |