1 /* 2 * Copyright (C) 2022 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_KERNEL_UTILS_SYSCALL_TABLE_H_ 18 #define SRC_KERNEL_UTILS_SYSCALL_TABLE_H_ 19 20 #include <memory> 21 #include <optional> 22 #include <string> 23 24 #include "perfetto/ext/base/string_view.h" 25 26 namespace perfetto { 27 28 static constexpr size_t kMaxSyscalls = 550; 29 30 enum Architecture { 31 kUnknown = 0, 32 kArmEabi, // 32-bit kernel running a 32-bit process (most old devices). 33 kAarch32, // 64-bit kernel running a 32-bit process (should be rare). 34 kAarch64, // 64-bit kernel running a 64-bit process (most new devices). 35 kX86_64, 36 kX86, 37 }; 38 39 class SyscallTable { 40 public: 41 explicit SyscallTable(Architecture arch); 42 43 // Use for testing. SyscallTable(const char * const * table,size_t count)44 SyscallTable(const char* const* table, size_t count) 45 : syscall_count_(count), syscall_table_(table) {} 46 47 // Return the architecture enum for the given uname machine string. 48 static Architecture ArchFromString(base::StringView machine); 49 50 // Returns the syscall table based on the current machine's architecture. Only 51 // works on Linux based systems. 52 static SyscallTable FromCurrentArch(); 53 54 // Returns the syscall id for the syscall with the given name. If the syscall 55 // is not found, returns std::nullopt. 56 std::optional<size_t> GetByName(const std::string& name) const; 57 58 // Returns the syscall name for the syscall with the given id. If the syscall 59 // is not found, returns nullptr. 60 const char* GetById(size_t id) const; 61 62 private: 63 size_t syscall_count_; 64 const char* const* syscall_table_; 65 }; 66 } // namespace perfetto 67 68 #endif // SRC_KERNEL_UTILS_SYSCALL_TABLE_H_ 69