1 /* 2 * Copyright (C) 2020 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 SIMPLE_PERF_KALLSYMS_H_ 18 #define SIMPLE_PERF_KALLSYMS_H_ 19 20 #include <string> 21 22 #include "environment.h" 23 24 namespace simpleperf { 25 26 struct KernelSymbol { 27 uint64_t addr; 28 char type; 29 const char* name; 30 const char* module; // If nullptr, the symbol is not in a kernel module. 31 }; 32 33 // Parses symbol_data as the content of /proc/kallsyms, calling the callback for 34 // each symbol that is found. Stops the parsing if the callback returns true. 35 bool ProcessKernelSymbols(std::string& symbol_data, 36 const std::function<bool(const KernelSymbol&)>& callback); 37 38 #if defined(__linux__) 39 40 // Returns the list of currently loaded kernel modules. 41 std::vector<KernelMmap> GetLoadedModules(); 42 43 // Returns the start address of the kernel. It uses /proc/kallsyms to find this 44 // address. Returns 0 if unknown. 45 uint64_t GetKernelStartAddress(); 46 47 // Loads the /proc/kallsyms file, requesting access if required. The value of 48 // kptr_restrict might be modified during the process. Its original value will 49 // be restored. This usually requires root privileges. 50 bool LoadKernelSymbols(std::string* kallsyms); 51 52 // only for testing 53 void ResetKernelAddressWarning(); 54 55 #endif // defined(__linux__) 56 57 } // namespace simpleperf 58 59 #endif // SIMPLE_PERF_KALLSYMS_H_ 60