/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "src/trace_processor/syscall_tracker.h"
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#include <type_traits>
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#include <utility>
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#include <inttypes.h>
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#include "src/trace_processor/stats.h"
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#include "src/trace_processor/syscalls_aarch32.h"
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#include "src/trace_processor/syscalls_aarch64.h"
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#include "src/trace_processor/syscalls_armeabi.h"
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#include "src/trace_processor/syscalls_x86_64.h"
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namespace perfetto {
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namespace trace_processor {
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namespace {
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template <typename T>
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constexpr size_t GetSyscalls(const T&) {
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static_assert(std::extent<T>::value <= kMaxSyscalls,
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"kMaxSyscalls too small");
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return std::extent<T>::value;
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}
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} // namespace
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// TODO(primiano): The current design is broken in case of 32-bit processes
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// running on 64-bit kernel. At least on ARM, the syscal numbers don't match
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// and we should use the kSyscalls_Aarch32 table for those processes. But this
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// means that the architecture is not a global property but is per-process.
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// Which in turn means that somehow we need to figure out what is the bitness
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// of each process from the trace.
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SyscallTracker::SyscallTracker(TraceProcessorContext* context)
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: context_(context) {
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SetArchitecture(kUnknown);
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}
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SyscallTracker::~SyscallTracker() = default;
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void SyscallTracker::SetArchitecture(Architecture arch) {
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const char* kSyscalls_Unknown[] = {nullptr};
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size_t num_syscalls = 0;
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const char* const* syscall_table = nullptr;
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switch (arch) {
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case kArmEabi:
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num_syscalls = GetSyscalls(kSyscalls_ArmEabi);
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syscall_table = &kSyscalls_ArmEabi[0];
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break;
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case kAarch32:
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num_syscalls = GetSyscalls(kSyscalls_Aarch32);
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syscall_table = &kSyscalls_Aarch32[0];
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break;
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case kAarch64:
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num_syscalls = GetSyscalls(kSyscalls_Aarch64);
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syscall_table = &kSyscalls_Aarch64[0];
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break;
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case kX86_64:
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num_syscalls = GetSyscalls(kSyscalls_x86_64);
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syscall_table = &kSyscalls_x86_64[0];
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break;
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case kUnknown:
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num_syscalls = 0;
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syscall_table = &kSyscalls_Unknown[0];
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break;
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}
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for (size_t i = 0; i < kMaxSyscalls; i++) {
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StringId id = 0;
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if (i < num_syscalls && syscall_table[i] && *syscall_table[i]) {
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const char* name = syscall_table[i];
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id = context_->storage->InternString(name);
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if (!strcmp(name, "sys_write"))
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sys_write_string_id_ = id;
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} else {
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char unknown_str[64];
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sprintf(unknown_str, "sys_%zu", i);
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id = context_->storage->InternString(unknown_str);
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}
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arch_syscall_to_string_id_[i] = id;
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}
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}
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} // namespace trace_processor
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} // namespace perfetto
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