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_X86_64_CONTEXT_X86_64_H_
18 #define ART_RUNTIME_ARCH_X86_64_CONTEXT_X86_64_H_
19 
20 #include "arch/context.h"
21 #include "base/logging.h"
22 #include "base/macros.h"
23 #include "registers_x86_64.h"
24 
25 namespace art {
26 namespace x86_64 {
27 
28 class X86_64Context : public Context {
29  public:
X86_64Context()30   X86_64Context() {
31     Reset();
32   }
~X86_64Context()33   virtual ~X86_64Context() {}
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(RSP, new_sp);
41   }
42 
SetPC(uintptr_t new_pc)43   void SetPC(uintptr_t new_pc) OVERRIDE {
44     rip_ = new_pc;
45   }
46 
SetArg0(uintptr_t new_arg0_value)47   void SetArg0(uintptr_t new_arg0_value) OVERRIDE {
48     SetGPR(RDI, new_arg0_value);
49   }
50 
IsAccessibleGPR(uint32_t reg)51   bool IsAccessibleGPR(uint32_t reg) OVERRIDE {
52     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters));
53     return gprs_[reg] != nullptr;
54   }
55 
GetGPRAddress(uint32_t reg)56   uintptr_t* GetGPRAddress(uint32_t reg) OVERRIDE {
57     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters));
58     return gprs_[reg];
59   }
60 
GetGPR(uint32_t reg)61   uintptr_t GetGPR(uint32_t reg) OVERRIDE {
62     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters));
63     DCHECK(IsAccessibleGPR(reg));
64     return *gprs_[reg];
65   }
66 
67   void SetGPR(uint32_t reg, uintptr_t value) OVERRIDE;
68 
IsAccessibleFPR(uint32_t reg)69   bool IsAccessibleFPR(uint32_t reg) OVERRIDE {
70     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfFloatRegisters));
71     return fprs_[reg] != nullptr;
72   }
73 
GetFPR(uint32_t reg)74   uintptr_t GetFPR(uint32_t reg) OVERRIDE {
75     DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfFloatRegisters));
76     DCHECK(IsAccessibleFPR(reg));
77     return *fprs_[reg];
78   }
79 
80   void SetFPR(uint32_t reg, uintptr_t value) OVERRIDE;
81 
82   void SmashCallerSaves() OVERRIDE;
83   NO_RETURN void DoLongJump() OVERRIDE;
84 
85  private:
86   // Pointers to register locations. Values are initialized to null or the special registers below.
87   uintptr_t* gprs_[kNumberOfCpuRegisters];
88   uint64_t* fprs_[kNumberOfFloatRegisters];
89   // Hold values for rsp, rip and arg0 if they are not located within a stack frame. RIP is somewhat
90   // special in that it cannot be encoded normally as a register operand to an instruction (except
91   // in 64bit addressing modes).
92   uintptr_t rsp_, rip_, arg0_;
93 };
94 }  // namespace x86_64
95 }  // namespace art
96 
97 #endif  // ART_RUNTIME_ARCH_X86_64_CONTEXT_X86_64_H_
98