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_MIPS64_CONTEXT_MIPS64_H_
18 #define ART_RUNTIME_ARCH_MIPS64_CONTEXT_MIPS64_H_
19 
20 #include <android-base/logging.h>
21 
22 #include "arch/context.h"
23 #include "base/macros.h"
24 #include "registers_mips64.h"
25 
26 namespace art {
27 namespace mips64 {
28 
29 class Mips64Context : public Context {
30  public:
Mips64Context()31   Mips64Context() {
32     Reset();
33   }
~Mips64Context()34   virtual ~Mips64Context() {}
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(T9, new_pc);
46   }
47 
IsAccessibleGPR(uint32_t reg)48   bool IsAccessibleGPR(uint32_t reg) override {
49     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfGpuRegisters));
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>(kNumberOfGpuRegisters));
55     return gprs_[reg];
56   }
57 
GetGPR(uint32_t reg)58   uintptr_t GetGPR(uint32_t reg) override {
59     CHECK_LT(reg, static_cast<uint32_t>(kNumberOfGpuRegisters));
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     CHECK_LT(reg, static_cast<uint32_t>(kNumberOfFpuRegisters));
68     return fprs_[reg] != nullptr;
69   }
70 
GetFPR(uint32_t reg)71   uintptr_t GetFPR(uint32_t reg) override {
72     CHECK_LT(reg, static_cast<uint32_t>(kNumberOfFpuRegisters));
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 
SetArg0(uintptr_t new_arg0_value)82   void SetArg0(uintptr_t new_arg0_value) override {
83     SetGPR(A0, new_arg0_value);
84   }
85 
86  private:
87   // Pointers to registers in the stack, initialized to null except for the special cases below.
88   uintptr_t* gprs_[kNumberOfGpuRegisters];
89   uint64_t* fprs_[kNumberOfFpuRegisters];
90   // Hold values for sp and t9 if they are not located within a stack frame. We use t9 for the
91   // PC (as ra is required to be valid for single-frame deopt and must not be clobbered). We
92   // also need the first argument for single-frame deopt.
93   uintptr_t sp_, t9_, arg0_;
94 };
95 
96 }  // namespace mips64
97 }  // namespace art
98 
99 #endif  // ART_RUNTIME_ARCH_MIPS64_CONTEXT_MIPS64_H_
100