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