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 #include "base/mutex.h" 24 25 namespace art { 26 27 class StackVisitor; 28 29 // Representation of a thread's context on the executing machine, used to implement long jumps in 30 // the quick stack frame layout. 31 class Context { 32 public: 33 // Creates a context for the running architecture 34 static Context* Create(); 35 36 virtual ~Context() {} 37 38 // Re-initializes the registers for context re-use. 39 virtual void Reset() = 0; 40 41 // Reads values from callee saves in the given frame. The frame also holds 42 // the method that holds the layout. 43 virtual void FillCalleeSaves(const StackVisitor& fr) 44 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) = 0; 45 46 // Sets the stack pointer value. 47 virtual void SetSP(uintptr_t new_sp) = 0; 48 49 // Sets the program counter value. 50 virtual void SetPC(uintptr_t new_pc) = 0; 51 52 // Gets the given GPRs address. 53 virtual uintptr_t* GetGPRAddress(uint32_t reg) = 0; 54 55 // Reads the given GPR. Returns true if we successfully read the register and 56 // set its value into 'val', returns false otherwise. 57 virtual bool GetGPR(uint32_t reg, uintptr_t* val) = 0; 58 59 // Sets the given GPR. Returns true if we successfully write the given value 60 // into the register, returns false otherwise. 61 virtual bool SetGPR(uint32_t reg, uintptr_t value) = 0; 62 63 // Reads the given FPR. Returns true if we successfully read the register and 64 // set its value into 'val', returns false otherwise. 65 virtual bool GetFPR(uint32_t reg, uintptr_t* val) = 0; 66 67 // Sets the given FPR. Returns true if we successfully write the given value 68 // into the register, returns false otherwise. 69 virtual bool SetFPR(uint32_t reg, uintptr_t value) = 0; 70 71 // Smashes the caller save registers. If we're throwing, we don't want to return bogus values. 72 virtual void SmashCallerSaves() = 0; 73 74 // Switches execution of the executing context to this context 75 virtual void DoLongJump() = 0; 76 77 protected: 78 enum { 79 kBadGprBase = 0xebad6070, 80 kBadFprBase = 0xebad8070, 81 }; 82 }; 83 84 } // namespace art 85 86 #endif // ART_RUNTIME_ARCH_CONTEXT_H_ 87
