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 
25 namespace art {
26 namespace arm {
27 
28 class ArmContext : public Context {
29  public:
ArmContext()30   ArmContext() {
31     Reset();
32   }
33 
~ArmContext()34   virtual ~ArmContext() {}
35 
36   void Reset() OVERRIDE;
37 
38   void FillCalleeSaves(uint8_t* frame, const QuickMethodFrameInfo& fr) OVERRIDE;
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_pc)44   void SetPC(uintptr_t new_pc) OVERRIDE {
45     SetGPR(PC, new_pc);
46   }
47 
SetArg0(uintptr_t new_arg0_value)48   void SetArg0(uintptr_t new_arg0_value) OVERRIDE {
49     SetGPR(R0, new_arg0_value);
50   }
51 
IsAccessibleGPR(uint32_t reg)52   bool IsAccessibleGPR(uint32_t reg) OVERRIDE {
53     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
54     return gprs_[reg] != nullptr;
55   }
56 
GetGPRAddress(uint32_t reg)57   uintptr_t* GetGPRAddress(uint32_t reg) OVERRIDE {
58     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
59     return gprs_[reg];
60   }
61 
GetGPR(uint32_t reg)62   uintptr_t GetGPR(uint32_t reg) OVERRIDE {
63     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
64     DCHECK(IsAccessibleGPR(reg));
65     return *gprs_[reg];
66   }
67 
68   void SetGPR(uint32_t reg, uintptr_t value) OVERRIDE;
69 
IsAccessibleFPR(uint32_t reg)70   bool IsAccessibleFPR(uint32_t reg) OVERRIDE {
71     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfSRegisters));
72     return fprs_[reg] != nullptr;
73   }
74 
GetFPR(uint32_t reg)75   uintptr_t GetFPR(uint32_t reg) OVERRIDE {
76     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfSRegisters));
77     DCHECK(IsAccessibleFPR(reg));
78     return *fprs_[reg];
79   }
80 
81   void SetFPR(uint32_t reg, uintptr_t value) OVERRIDE;
82 
83   void SmashCallerSaves() OVERRIDE;
84   NO_RETURN void DoLongJump() OVERRIDE;
85 
86  private:
87   // Pointers to register locations, initialized to null or the specific registers below.
88   uintptr_t* gprs_[kNumberOfCoreRegisters];
89   uint32_t* fprs_[kNumberOfSRegisters];
90   // Hold values for sp and pc if they are not located within a stack frame.
91   uintptr_t sp_, pc_, arg0_;
92 };
93 
94 }  // namespace arm
95 }  // namespace art
96 
97 #endif  // ART_RUNTIME_ARCH_ARM_CONTEXT_ARM_H_
98