1/*
2 * Copyright (C) 2011 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_ARM_CONTEXT_ARM_H_
18#define ART_RUNTIME_ARCH_ARM_CONTEXT_ARM_H_
19
20#include "arch/context.h"
21#include "base/logging.h"
22#include "base/macros.h"
23#include "registers_arm.h"
24
25namespace art {
26namespace arm {
27
28class ArmContext : public Context {
29 public:
30  ArmContext() {
31    Reset();
32  }
33
34  virtual ~ArmContext() {}
35
36  void Reset() OVERRIDE;
37
38  void FillCalleeSaves(const StackVisitor& fr) OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
39
40  void SetSP(uintptr_t new_sp) OVERRIDE {
41    SetGPR(SP, new_sp);
42  }
43
44  void SetPC(uintptr_t new_pc) OVERRIDE {
45    SetGPR(PC, new_pc);
46  }
47
48  bool IsAccessibleGPR(uint32_t reg) OVERRIDE {
49    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
50    return gprs_[reg] != nullptr;
51  }
52
53  uintptr_t* GetGPRAddress(uint32_t reg) OVERRIDE {
54    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
55    return gprs_[reg];
56  }
57
58  uintptr_t GetGPR(uint32_t reg) OVERRIDE {
59    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
60    DCHECK(IsAccessibleGPR(reg));
61    return *gprs_[reg];
62  }
63
64  void SetGPR(uint32_t reg, uintptr_t value) OVERRIDE;
65
66  bool IsAccessibleFPR(uint32_t reg) OVERRIDE {
67    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfSRegisters));
68    return fprs_[reg] != nullptr;
69  }
70
71  uintptr_t GetFPR(uint32_t reg) OVERRIDE {
72    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfSRegisters));
73    DCHECK(IsAccessibleFPR(reg));
74    return *fprs_[reg];
75  }
76
77  void SetFPR(uint32_t reg, uintptr_t value) OVERRIDE;
78
79  void SmashCallerSaves() OVERRIDE;
80  NO_RETURN void DoLongJump() OVERRIDE;
81
82 private:
83  // Pointers to register locations, initialized to null or the specific registers below.
84  uintptr_t* gprs_[kNumberOfCoreRegisters];
85  uint32_t* fprs_[kNumberOfSRegisters];
86  // Hold values for sp and pc if they are not located within a stack frame.
87  uintptr_t sp_, pc_;
88};
89
90}  // namespace arm
91}  // namespace art
92
93#endif  // ART_RUNTIME_ARCH_ARM_CONTEXT_ARM_H_
94