1 /* 2 * Copyright (C) 2019 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 #ifndef SRC_TRACE_PROCESSOR_SYSCALL_TRACKER_H_ 18 #define SRC_TRACE_PROCESSOR_SYSCALL_TRACKER_H_ 19 20 #include <limits> 21 #include <tuple> 22 23 #include "perfetto/base/string_view.h" 24 #include "src/trace_processor/slice_tracker.h" 25 #include "src/trace_processor/trace_processor_context.h" 26 #include "src/trace_processor/trace_storage.h" 27 28 namespace perfetto { 29 namespace trace_processor { 30 31 static constexpr size_t kMaxSyscalls = 550; 32 33 enum Architecture { 34 kUnknown = 0, 35 kArmEabi, // 32-bit kernel running a 32-bit process (most old devices). 36 kAarch32, // 64-bit kernel running a 32-bit process (should be rare). 37 kAarch64, // 64-bit kernel running a 64-bit process (most new devices). 38 kX86_64, 39 }; 40 41 class SyscallTracker { 42 public: 43 explicit SyscallTracker(TraceProcessorContext*); 44 SyscallTracker(const SyscallTracker&) = delete; 45 SyscallTracker& operator=(const SyscallTracker&) = delete; 46 virtual ~SyscallTracker(); 47 48 void SetArchitecture(Architecture architecture); 49 50 void Enter(int64_t ts, UniqueTid utid, uint32_t syscall_num) { 51 StringId name = SyscallNumberToStringId(syscall_num); 52 if (name) 53 context_->slice_tracker->Begin(ts, utid, 0 /* cat */, name); 54 } 55 56 void Exit(int64_t ts, UniqueTid utid, uint32_t syscall_num) { 57 StringId name = SyscallNumberToStringId(syscall_num); 58 if (name) 59 context_->slice_tracker->End(ts, utid, 0 /* cat */, name); 60 } 61 62 private: 63 TraceProcessorContext* const context_; 64 65 inline StringId SyscallNumberToStringId(uint32_t syscall_num) { 66 if (syscall_num > kMaxSyscalls) 67 return 0; 68 // We see two write sys calls around each userspace slice that is going via 69 // trace_marker, this violates the assumption that userspace slices are 70 // perfectly nested. For the moment ignore all write sys calls. 71 // TODO(hjd): Remove this limitation. 72 StringId id = arch_syscall_to_string_id_[syscall_num]; 73 if (id == sys_write_string_id_) 74 return 0; 75 return id; 76 } 77 78 // This is table from platform specific syscall number directly to 79 // the relevent StringId (this avoids having to always do two conversions). 80 std::array<StringId, kMaxSyscalls> arch_syscall_to_string_id_{}; 81 StringId sys_write_string_id_ = std::numeric_limits<StringId>::max(); 82 }; 83 84 } // namespace trace_processor 85 } // namespace perfetto 86 87 #endif // SRC_TRACE_PROCESSOR_SYSCALL_TRACKER_H_ 88
