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_CONTEXT_H_
18#define ART_RUNTIME_ARCH_CONTEXT_H_
19
20#include <stddef.h>
21#include <stdint.h>
22
23namespace art {
24
25class StackVisitor;
26
27// Representation of a thread's context on the executing machine, used to implement long jumps in
28// the quick stack frame layout.
29class Context {
30 public:
31  // Creates a context for the running architecture
32  static Context* Create();
33
34  virtual ~Context() {}
35
36  // Re-initializes the registers for context re-use.
37  virtual void Reset() = 0;
38
39  // Read values from callee saves in the given frame. The frame also holds
40  // the method that holds the layout.
41  virtual void FillCalleeSaves(const StackVisitor& fr) = 0;
42
43  // Set the stack pointer value
44  virtual void SetSP(uintptr_t new_sp) = 0;
45
46  // Set the program counter value
47  virtual void SetPC(uintptr_t new_pc) = 0;
48
49  // Read the given GPR
50  virtual uintptr_t GetGPR(uint32_t reg) = 0;
51
52  // Set the given GPR.
53  virtual void SetGPR(uint32_t reg, uintptr_t value) = 0;
54
55  // Smash the caller save registers. If we're throwing, we don't want to return bogus values.
56  virtual void SmashCallerSaves() = 0;
57
58  // Switch execution of the executing context to this context
59  virtual void DoLongJump() = 0;
60
61 protected:
62  enum {
63    kBadGprBase = 0xebad6070,
64    kBadFprBase = 0xebad8070,
65  };
66};
67
68}  // namespace art
69
70#endif  // ART_RUNTIME_ARCH_CONTEXT_H_
71