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
25namespace art {
26namespace x86_64 {
27
28class X86_64Context : public Context {
29 public:
30  X86_64Context() {
31    Reset();
32  }
33  virtual ~X86_64Context() {}
34
35  void Reset() OVERRIDE;
36
37  void FillCalleeSaves(uint8_t* frame, const QuickMethodFrameInfo& fr) OVERRIDE;
38
39  void SetSP(uintptr_t new_sp) OVERRIDE {
40    SetGPR(RSP, new_sp);
41  }
42
43  void SetPC(uintptr_t new_pc) OVERRIDE {
44    rip_ = new_pc;
45  }
46
47  void SetArg0(uintptr_t new_arg0_value) OVERRIDE {
48    SetGPR(RDI, new_arg0_value);
49  }
50
51  bool IsAccessibleGPR(uint32_t reg) OVERRIDE {
52    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters));
53    return gprs_[reg] != nullptr;
54  }
55
56  uintptr_t* GetGPRAddress(uint32_t reg) OVERRIDE {
57    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters));
58    return gprs_[reg];
59  }
60
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
69  bool IsAccessibleFPR(uint32_t reg) OVERRIDE {
70    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfFloatRegisters));
71    return fprs_[reg] != nullptr;
72  }
73
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