1 /*
2  * Copyright (C) 2015 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 "simulator/code_simulator_arm64.h"
18 
19 #include "base/logging.h"
20 
21 using namespace vixl::aarch64;  // NOLINT(build/namespaces)
22 
23 namespace art {
24 namespace arm64 {
25 
26 // VIXL has not been tested on 32bit architectures, so Simulator is not always
27 // available. To avoid linker error on these architectures, we check if we can simulate
28 // in the beginning of following methods, with compile time constant `kCanSimulate`.
29 // TODO: when Simulator is always available, remove the these checks.
30 
CreateCodeSimulatorArm64()31 CodeSimulatorArm64* CodeSimulatorArm64::CreateCodeSimulatorArm64() {
32   if (kCanSimulate) {
33     return new CodeSimulatorArm64();
34   } else {
35     return nullptr;
36   }
37 }
38 
CodeSimulatorArm64()39 CodeSimulatorArm64::CodeSimulatorArm64()
40     : CodeSimulator(), decoder_(nullptr), simulator_(nullptr) {
41   DCHECK(kCanSimulate);
42   decoder_ = new Decoder();
43   simulator_ = new Simulator(decoder_);
44 }
45 
~CodeSimulatorArm64()46 CodeSimulatorArm64::~CodeSimulatorArm64() {
47   DCHECK(kCanSimulate);
48   delete simulator_;
49   delete decoder_;
50 }
51 
RunFrom(intptr_t code_buffer)52 void CodeSimulatorArm64::RunFrom(intptr_t code_buffer) {
53   DCHECK(kCanSimulate);
54   simulator_->RunFrom(reinterpret_cast<const Instruction*>(code_buffer));
55 }
56 
GetCReturnBool() const57 bool CodeSimulatorArm64::GetCReturnBool() const {
58   DCHECK(kCanSimulate);
59   return simulator_->ReadWRegister(0);
60 }
61 
GetCReturnInt32() const62 int32_t CodeSimulatorArm64::GetCReturnInt32() const {
63   DCHECK(kCanSimulate);
64   return simulator_->ReadWRegister(0);
65 }
66 
GetCReturnInt64() const67 int64_t CodeSimulatorArm64::GetCReturnInt64() const {
68   DCHECK(kCanSimulate);
69   return simulator_->ReadXRegister(0);
70 }
71 
72 }  // namespace arm64
73 }  // namespace art
74