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 23 namespace art { 24 25 class 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. 29 class Context { 30 public: 31 // Creates a context for the running architecture 32 static Context* Create(); 33 ~Context()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