1/*
2 * Copyright (C) 2014 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#ifndef ART_RUNTIME_ARCH_ARM64_CONTEXT_ARM64_H_
18#define ART_RUNTIME_ARCH_ARM64_CONTEXT_ARM64_H_
19
20#include "arch/context.h"
21#include "base/logging.h"
22#include "base/macros.h"
23#include "registers_arm64.h"
24
25namespace art {
26namespace arm64 {
27
28class Arm64Context : public Context {
29 public:
30  Arm64Context() {
31    Reset();
32  }
33
34  ~Arm64Context() {}
35
36  void Reset() OVERRIDE;
37
38  void FillCalleeSaves(uint8_t* frame, const QuickMethodFrameInfo& fr) OVERRIDE;
39
40  void SetSP(uintptr_t new_sp) OVERRIDE {
41    SetGPR(SP, new_sp);
42  }
43
44  void SetPC(uintptr_t new_lr) OVERRIDE {
45    SetGPR(kPC, new_lr);
46  }
47
48  void SetArg0(uintptr_t new_arg0_value) OVERRIDE {
49    SetGPR(X0, new_arg0_value);
50  }
51
52  bool IsAccessibleGPR(uint32_t reg) OVERRIDE {
53    DCHECK_LT(reg, arraysize(gprs_));
54    return gprs_[reg] != nullptr;
55  }
56
57  uintptr_t* GetGPRAddress(uint32_t reg) OVERRIDE {
58    DCHECK_LT(reg, arraysize(gprs_));
59    return gprs_[reg];
60  }
61
62  uintptr_t GetGPR(uint32_t reg) OVERRIDE {
63    // Note: PC isn't an available GPR (outside of internals), so don't allow retrieving the value.
64    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfXRegisters));
65    DCHECK(IsAccessibleGPR(reg));
66    return *gprs_[reg];
67  }
68
69  void SetGPR(uint32_t reg, uintptr_t value) OVERRIDE;
70
71  bool IsAccessibleFPR(uint32_t reg) OVERRIDE {
72    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfDRegisters));
73    return fprs_[reg] != nullptr;
74  }
75
76  uintptr_t GetFPR(uint32_t reg) OVERRIDE {
77    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfDRegisters));
78    DCHECK(IsAccessibleFPR(reg));
79    return *fprs_[reg];
80  }
81
82  void SetFPR(uint32_t reg, uintptr_t value) OVERRIDE;
83
84  void SmashCallerSaves() OVERRIDE;
85  NO_RETURN void DoLongJump() OVERRIDE;
86
87  static constexpr size_t kPC = kNumberOfXRegisters;
88
89 private:
90  // Pointers to register locations, initialized to null or the specific registers below. We need
91  // an additional one for the PC.
92  uintptr_t* gprs_[kNumberOfXRegisters + 1];
93  uint64_t * fprs_[kNumberOfDRegisters];
94  // Hold values for sp, pc and arg0 if they are not located within a stack frame.
95  uintptr_t sp_, pc_, arg0_;
96};
97
98}  // namespace arm64
99}  // namespace art
100
101#endif  // ART_RUNTIME_ARCH_ARM64_CONTEXT_ARM64_H_
102