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 <android-base/logging.h>
21 
22 #include "arch/context.h"
23 #include "base/macros.h"
24 #include "registers_arm.h"
25 
26 namespace art HIDDEN {
27 namespace arm {
28 
29 class ArmContext final : public Context {
30  public:
ArmContext()31   ArmContext() {
32     Reset();
33   }
34 
~ArmContext()35   virtual ~ArmContext() {}
36 
37   void Reset() override;
38 
39   void FillCalleeSaves(uint8_t* frame, const QuickMethodFrameInfo& fr) override;
40 
SetSP(uintptr_t new_sp)41   void SetSP(uintptr_t new_sp) override {
42     SetGPR(SP, new_sp);
43   }
44 
SetPC(uintptr_t new_pc)45   void SetPC(uintptr_t new_pc) override {
46     SetGPR(PC, new_pc);
47   }
48 
SetNterpDexPC(uintptr_t dex_pc_ptr)49   void SetNterpDexPC(uintptr_t dex_pc_ptr) override {
50     SetGPR(R11, dex_pc_ptr);
51   }
52 
SetArg0(uintptr_t new_arg0_value)53   void SetArg0(uintptr_t new_arg0_value) override {
54     SetGPR(R0, new_arg0_value);
55   }
56 
IsAccessibleGPR(uint32_t reg)57   bool IsAccessibleGPR(uint32_t reg) override {
58     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
59     return gprs_[reg] != nullptr;
60   }
61 
GetGPRAddress(uint32_t reg)62   uintptr_t* GetGPRAddress(uint32_t reg) override {
63     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
64     return gprs_[reg];
65   }
66 
GetGPR(uint32_t reg)67   uintptr_t GetGPR(uint32_t reg) override {
68     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
69     DCHECK(IsAccessibleGPR(reg));
70     return *gprs_[reg];
71   }
72 
73   void SetGPR(uint32_t reg, uintptr_t value) override;
74 
IsAccessibleFPR(uint32_t reg)75   bool IsAccessibleFPR(uint32_t reg) override {
76     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfSRegisters));
77     return fprs_[reg] != nullptr;
78   }
79 
GetFPR(uint32_t reg)80   uintptr_t GetFPR(uint32_t reg) override {
81     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfSRegisters));
82     DCHECK(IsAccessibleFPR(reg));
83     return *fprs_[reg];
84   }
85 
86   void SetFPR(uint32_t reg, uintptr_t value) override;
87 
88   void SmashCallerSaves() override;
89   NO_RETURN void DoLongJump() override;
90 
91  private:
92   // Pointers to register locations, initialized to null or the specific registers below.
93   uintptr_t* gprs_[kNumberOfCoreRegisters];
94   uint32_t* fprs_[kNumberOfSRegisters];
95   // Hold values for sp and pc if they are not located within a stack frame.
96   uintptr_t sp_, pc_, arg0_;
97 };
98 
99 }  // namespace arm
100 }  // namespace art
101 
102 #endif  // ART_RUNTIME_ARCH_ARM_CONTEXT_ARM_H_
103