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_MIPS_CONTEXT_MIPS_H_
18 #define ART_RUNTIME_ARCH_MIPS_CONTEXT_MIPS_H_
19 
20 #include "arch/context.h"
21 #include "base/logging.h"
22 #include "base/macros.h"
23 #include "registers_mips.h"
24 
25 namespace art {
26 namespace mips {
27 
28 class MipsContext : public Context {
29  public:
MipsContext()30   MipsContext() {
31     Reset();
32   }
~MipsContext()33   virtual ~MipsContext() {}
34 
35   void Reset() OVERRIDE;
36 
37   void FillCalleeSaves(uint8_t* frame, const QuickMethodFrameInfo& fr) OVERRIDE;
38 
SetSP(uintptr_t new_sp)39   void SetSP(uintptr_t new_sp) OVERRIDE {
40     SetGPR(SP, new_sp);
41   }
42 
SetPC(uintptr_t new_pc)43   void SetPC(uintptr_t new_pc) OVERRIDE {
44     SetGPR(T9, new_pc);
45   }
46 
IsAccessibleGPR(uint32_t reg)47   bool IsAccessibleGPR(uint32_t reg) OVERRIDE {
48     CHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
49     return gprs_[reg] != nullptr;
50   }
51 
GetGPRAddress(uint32_t reg)52   uintptr_t* GetGPRAddress(uint32_t reg) OVERRIDE {
53     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
54     return gprs_[reg];
55   }
56 
GetGPR(uint32_t reg)57   uintptr_t GetGPR(uint32_t reg) OVERRIDE {
58     CHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
59     DCHECK(IsAccessibleGPR(reg));
60     return *gprs_[reg];
61   }
62 
63   void SetGPR(uint32_t reg, uintptr_t value) OVERRIDE;
64 
IsAccessibleFPR(uint32_t reg)65   bool IsAccessibleFPR(uint32_t reg) OVERRIDE {
66     CHECK_LT(reg, static_cast<uint32_t>(kNumberOfFRegisters));
67     return fprs_[reg] != nullptr;
68   }
69 
GetFPR(uint32_t reg)70   uintptr_t GetFPR(uint32_t reg) OVERRIDE {
71     CHECK_LT(reg, static_cast<uint32_t>(kNumberOfFRegisters));
72     DCHECK(IsAccessibleFPR(reg));
73     return *fprs_[reg];
74   }
75 
76   void SetFPR(uint32_t reg, uintptr_t value) OVERRIDE;
77 
78   void SmashCallerSaves() OVERRIDE;
79   NO_RETURN void DoLongJump() OVERRIDE;
80 
SetArg0(uintptr_t new_arg0_value)81   void SetArg0(uintptr_t new_arg0_value) OVERRIDE {
82     SetGPR(A0, new_arg0_value);
83   }
84 
85  private:
86   // Pointers to registers in the stack, initialized to null except for the special cases below.
87   uintptr_t* gprs_[kNumberOfCoreRegisters];
88   uint32_t* fprs_[kNumberOfFRegisters];
89   // Hold values for sp and t9 if they are not located within a stack frame. We use t9 for the
90   // PC (as ra is required to be valid for single-frame deopt and must not be clobbered). We
91   // also need the first argument for single-frame deopt.
92   uintptr_t sp_, t9_, arg0_;
93 };
94 }  // namespace mips
95 }  // namespace art
96 
97 #endif  // ART_RUNTIME_ARCH_MIPS_CONTEXT_MIPS_H_
98