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 
25 namespace art {
26 namespace arm64 {
27 
28 class Arm64Context : public Context {
29  public:
Arm64Context()30   Arm64Context() {
31     Reset();
32   }
33 
~Arm64Context()34   ~Arm64Context() {}
35 
36   void Reset() OVERRIDE;
37 
38   void FillCalleeSaves(const StackVisitor& fr) OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
39 
SetSP(uintptr_t new_sp)40   void SetSP(uintptr_t new_sp) OVERRIDE {
41     SetGPR(SP, new_sp);
42   }
43 
SetPC(uintptr_t new_lr)44   void SetPC(uintptr_t new_lr) OVERRIDE {
45     SetGPR(LR, new_lr);
46   }
47 
IsAccessibleGPR(uint32_t reg)48   bool IsAccessibleGPR(uint32_t reg) OVERRIDE {
49     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfXRegisters));
50     return gprs_[reg] != nullptr;
51   }
52 
GetGPRAddress(uint32_t reg)53   uintptr_t* GetGPRAddress(uint32_t reg) OVERRIDE {
54     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfXRegisters));
55     return gprs_[reg];
56   }
57 
GetGPR(uint32_t reg)58   uintptr_t GetGPR(uint32_t reg) OVERRIDE {
59     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfXRegisters));
60     DCHECK(IsAccessibleGPR(reg));
61     return *gprs_[reg];
62   }
63 
64   void SetGPR(uint32_t reg, uintptr_t value) OVERRIDE;
65 
IsAccessibleFPR(uint32_t reg)66   bool IsAccessibleFPR(uint32_t reg) OVERRIDE {
67     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfDRegisters));
68     return fprs_[reg] != nullptr;
69   }
70 
GetFPR(uint32_t reg)71   uintptr_t GetFPR(uint32_t reg) OVERRIDE {
72     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfDRegisters));
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_[kNumberOfXRegisters];
85   uint64_t * fprs_[kNumberOfDRegisters];
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 arm64
91 }  // namespace art
92 
93 #endif  // ART_RUNTIME_ARCH_ARM64_CONTEXT_ARM64_H_
94