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 "code_simulator_arm64.h"
18
19 #include <android-base/logging.h>
20
21 using namespace vixl::aarch64; // NOLINT(build/namespaces)
22
23 namespace art {
24
25 // Enable the simulator debugger, disabled by default.
26 static constexpr bool kSimDebuggerEnabled = false;
27
28 namespace arm64 {
29
30 // VIXL has not been tested on 32bit architectures, so Simulator is not always
31 // available. To avoid linker error on these architectures, we check if we can simulate
32 // in the beginning of following methods, with compile time constant `kCanSimulate`.
33 // TODO: when Simulator is always available, remove the these checks.
34
CreateCodeSimulatorArm64()35 CodeSimulatorArm64* CodeSimulatorArm64::CreateCodeSimulatorArm64() {
36 if (kCanSimulate) {
37 return new CodeSimulatorArm64();
38 } else {
39 return nullptr;
40 }
41 }
42
CodeSimulatorArm64()43 CodeSimulatorArm64::CodeSimulatorArm64()
44 : CodeSimulator(), decoder_(nullptr), simulator_(nullptr) {
45 DCHECK(kCanSimulate);
46 decoder_ = new Decoder();
47
48 SimStack stack_builder;
49 stack_builder.SetLimitGuardSize(0x4000);
50 stack_builder.SetUsableSize(0x4000);
51 SimStack::Allocated stack = stack_builder.Allocate();
52
53 simulator_ = new Simulator(decoder_, stdout, std::move(stack));
54 simulator_->SetVectorLengthInBits(kArm64DefaultSVEVectorLength);
55 simulator_->DisableGCSCheck();
56 simulator_->SetDebuggerEnabled(kSimDebuggerEnabled);
57 }
58
~CodeSimulatorArm64()59 CodeSimulatorArm64::~CodeSimulatorArm64() {
60 DCHECK(kCanSimulate);
61 delete simulator_;
62 delete decoder_;
63 }
64
RunFrom(intptr_t code_buffer)65 void CodeSimulatorArm64::RunFrom(intptr_t code_buffer) {
66 DCHECK(kCanSimulate);
67 simulator_->RunFrom(reinterpret_cast<const Instruction*>(code_buffer));
68 }
69
GetCReturnBool() const70 bool CodeSimulatorArm64::GetCReturnBool() const {
71 DCHECK(kCanSimulate);
72 return simulator_->ReadWRegister(0);
73 }
74
GetCReturnInt32() const75 int32_t CodeSimulatorArm64::GetCReturnInt32() const {
76 DCHECK(kCanSimulate);
77 return simulator_->ReadWRegister(0);
78 }
79
GetCReturnInt64() const80 int64_t CodeSimulatorArm64::GetCReturnInt64() const {
81 DCHECK(kCanSimulate);
82 return simulator_->ReadXRegister(0);
83 }
84
85 } // namespace arm64
86 } // namespace art
87