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 #include "src/trace_processor/importers/syscalls/syscall_tracker.h" 18 19 #include <type_traits> 20 #include <utility> 21 22 #include <inttypes.h> 23 24 #include "src/trace_processor/storage/stats.h" 25 26 #include "src/trace_processor/importers/syscalls/syscalls_aarch32.h" 27 #include "src/trace_processor/importers/syscalls/syscalls_aarch64.h" 28 #include "src/trace_processor/importers/syscalls/syscalls_armeabi.h" 29 #include "src/trace_processor/importers/syscalls/syscalls_x86.h" 30 #include "src/trace_processor/importers/syscalls/syscalls_x86_64.h" 31 32 namespace perfetto { 33 namespace trace_processor { 34 namespace { 35 36 template <typename T> GetSyscalls(const T &)37constexpr size_t GetSyscalls(const T&) { 38 static_assert(std::extent<T>::value <= kMaxSyscalls, 39 "kMaxSyscalls too small"); 40 return std::extent<T>::value; 41 } 42 43 } // namespace 44 45 // TODO(primiano): The current design is broken in case of 32-bit processes 46 // running on 64-bit kernel. At least on ARM, the syscal numbers don't match 47 // and we should use the kSyscalls_Aarch32 table for those processes. But this 48 // means that the architecture is not a global property but is per-process. 49 // Which in turn means that somehow we need to figure out what is the bitness 50 // of each process from the trace. SyscallTracker(TraceProcessorContext * context)51SyscallTracker::SyscallTracker(TraceProcessorContext* context) 52 : context_(context) { 53 SetArchitecture(kUnknown); 54 } 55 56 SyscallTracker::~SyscallTracker() = default; 57 SetArchitecture(Architecture arch)58void SyscallTracker::SetArchitecture(Architecture arch) { 59 const char* kSyscalls_Unknown[] = {nullptr}; 60 size_t num_syscalls = 0; 61 const char* const* syscall_table = nullptr; 62 63 switch (arch) { 64 case kArmEabi: 65 num_syscalls = GetSyscalls(kSyscalls_ArmEabi); 66 syscall_table = &kSyscalls_ArmEabi[0]; 67 break; 68 case kAarch32: 69 num_syscalls = GetSyscalls(kSyscalls_Aarch32); 70 syscall_table = &kSyscalls_Aarch32[0]; 71 break; 72 case kAarch64: 73 num_syscalls = GetSyscalls(kSyscalls_Aarch64); 74 syscall_table = &kSyscalls_Aarch64[0]; 75 break; 76 case kX86_64: 77 num_syscalls = GetSyscalls(kSyscalls_x86_64); 78 syscall_table = &kSyscalls_x86_64[0]; 79 break; 80 case kX86: 81 num_syscalls = GetSyscalls(kSyscalls_x86); 82 syscall_table = &kSyscalls_x86[0]; 83 break; 84 case kUnknown: 85 num_syscalls = 0; 86 syscall_table = &kSyscalls_Unknown[0]; 87 break; 88 } 89 90 for (size_t i = 0; i < kMaxSyscalls; i++) { 91 StringId id = kNullStringId; 92 if (i < num_syscalls && syscall_table[i] && *syscall_table[i]) { 93 const char* name = syscall_table[i]; 94 id = context_->storage->InternString(name); 95 if (!strcmp(name, "sys_write")) 96 sys_write_string_id_ = id; 97 } else { 98 char unknown_str[64]; 99 sprintf(unknown_str, "sys_%zu", i); 100 id = context_->storage->InternString(unknown_str); 101 } 102 arch_syscall_to_string_id_[i] = id; 103 } 104 } 105 106 } // namespace trace_processor 107 } // namespace perfetto 108