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 "registers_x86_64.h"
23
24namespace art {
25namespace x86_64 {
26
27class X86_64Context : public Context {
28 public:
29  X86_64Context() {
30    Reset();
31  }
32  virtual ~X86_64Context() {}
33
34  void Reset() OVERRIDE;
35
36  void FillCalleeSaves(const StackVisitor& fr) OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
37
38  void SetSP(uintptr_t new_sp) OVERRIDE {
39    bool success = SetGPR(RSP, new_sp);
40    CHECK(success) << "Failed to set RSP register";
41  }
42
43  void SetPC(uintptr_t new_pc) OVERRIDE {
44    rip_ = new_pc;
45  }
46
47  uintptr_t* GetGPRAddress(uint32_t reg) OVERRIDE {
48    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters));
49    return gprs_[reg];
50  }
51
52  bool GetGPR(uint32_t reg, uintptr_t* val) OVERRIDE {
53    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters));
54    if (gprs_[reg] == nullptr) {
55      return false;
56    } else {
57      DCHECK(val != nullptr);
58      *val = *gprs_[reg];
59      return true;
60    }
61  }
62
63  bool SetGPR(uint32_t reg, uintptr_t value) OVERRIDE;
64
65  bool GetFPR(uint32_t reg, uintptr_t* val) OVERRIDE {
66    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfFloatRegisters));
67    if (fprs_[reg] == nullptr) {
68      return false;
69    } else {
70      DCHECK(val != nullptr);
71      *val = *fprs_[reg];
72      return true;
73    }
74  }
75
76  bool SetFPR(uint32_t reg, uintptr_t value) OVERRIDE;
77
78  void SmashCallerSaves() OVERRIDE;
79  void DoLongJump() OVERRIDE;
80
81 private:
82  // Pointers to register locations. Values are initialized to NULL or the special registers below.
83  uintptr_t* gprs_[kNumberOfCpuRegisters];
84  uint64_t* fprs_[kNumberOfFloatRegisters];
85  // Hold values for rsp and rip if they are not located within a stack frame. RIP is somewhat
86  // special in that it cannot be encoded normally as a register operand to an instruction (except
87  // in 64bit addressing modes).
88  uintptr_t rsp_, rip_;
89};
90}  // namespace x86_64
91}  // namespace art
92
93#endif  // ART_RUNTIME_ARCH_X86_64_CONTEXT_X86_64_H_
94