context_arm.h revision 0bcb2902ec21393d71c94e63aa6733cb5311a0cc 
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_ARM_CONTEXT_ARM_H_
18#define ART_RUNTIME_ARCH_ARM_CONTEXT_ARM_H_
19
20#include "arch/context.h"
21#include "base/logging.h"
22#include "registers_arm.h"
23
24namespace art {
25namespace arm {
26
27class ArmContext : public Context {
28 public:
29  ArmContext() {
30    Reset();
31  }
32
33  virtual ~ArmContext() {}
34
35  void Reset() OVERRIDE;
36
37  void FillCalleeSaves(const StackVisitor& fr) OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
38
39  void SetSP(uintptr_t new_sp) OVERRIDE {
40    bool success = SetGPR(SP, new_sp);
41    CHECK(success) << "Failed to set SP register";
42  }
43
44  void SetPC(uintptr_t new_pc) OVERRIDE {
45    bool success = SetGPR(PC, new_pc);
46    CHECK(success) << "Failed to set PC register";
47  }
48
49  uintptr_t* GetGPRAddress(uint32_t reg) OVERRIDE {
50    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
51    return gprs_[reg];
52  }
53
54  bool GetGPR(uint32_t reg, uintptr_t* val) OVERRIDE {
55    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
56    if (gprs_[reg] == nullptr) {
57      return false;
58    } else {
59      DCHECK(val != nullptr);
60      *val = *gprs_[reg];
61      return true;
62    }
63  }
64
65  bool SetGPR(uint32_t reg, uintptr_t value) OVERRIDE;
66
67  bool GetFPR(uint32_t reg, uintptr_t* val) OVERRIDE {
68    DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfSRegisters));
69    if (fprs_[reg] == nullptr) {
70      return false;
71    } else {
72      DCHECK(val != nullptr);
73      *val = *fprs_[reg];
74      return true;
75    }
76  }
77
78  bool SetFPR(uint32_t reg, uintptr_t value) OVERRIDE;
79
80  void SmashCallerSaves() OVERRIDE;
81  void DoLongJump() OVERRIDE;
82
83 private:
84  // Pointers to register locations, initialized to NULL or the specific registers below.
85  uintptr_t* gprs_[kNumberOfCoreRegisters];
86  uint32_t* fprs_[kNumberOfSRegisters];
87  // Hold values for sp and pc if they are not located within a stack frame.
88  uintptr_t sp_, pc_;
89};
90
91}  // namespace arm
92}  // namespace art
93
94#endif  // ART_RUNTIME_ARCH_ARM_CONTEXT_ARM_H_
95