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/macros.h" 24 #include "base/mutex.h" 25 26 namespace art { 27 28 class QuickMethodFrameInfo; 29 30 // Representation of a thread's context on the executing machine, used to implement long jumps in 31 // the quick stack frame layout. 32 class Context { 33 public: 34 // Creates a context for the running architecture 35 static Context* Create(); 36 37 virtual ~Context() {} 38 39 // Re-initializes the registers for context re-use. 40 virtual void Reset() = 0; 41 42 static uintptr_t* CalleeSaveAddress(uint8_t* frame, int num, size_t frame_size) { 43 // Callee saves are held at the top of the frame 44 uint8_t* save_addr = frame + frame_size - ((num + 1) * sizeof(void*)); 45 #if defined(__i386__) || defined(__x86_64__) 46 save_addr -= sizeof(void*); // account for return address 47 #endif 48 return reinterpret_cast<uintptr_t*>(save_addr); 49 } 50 51 // Reads values from callee saves in the given frame. The frame also holds 52 // the method that holds the layout. 53 virtual void FillCalleeSaves(uint8_t* frame, const QuickMethodFrameInfo& fr) = 0; 54 55 // Sets the stack pointer value. 56 virtual void SetSP(uintptr_t new_sp) = 0; 57 58 // Sets the program counter value. 59 virtual void SetPC(uintptr_t new_pc) = 0; 60 61 // Sets the first argument register. 62 virtual void SetArg0(uintptr_t new_arg0_value) = 0; 63 64 // Returns whether the given GPR is accessible (read or write). 65 virtual bool IsAccessibleGPR(uint32_t reg) = 0; 66 67 // Gets the given GPRs address. 68 virtual uintptr_t* GetGPRAddress(uint32_t reg) = 0; 69 70 // Reads the given GPR. The caller is responsible for checking the register 71 // is accessible with IsAccessibleGPR. 72 virtual uintptr_t GetGPR(uint32_t reg) = 0; 73 74 // Sets the given GPR. The caller is responsible for checking the register 75 // is accessible with IsAccessibleGPR. 76 virtual void SetGPR(uint32_t reg, uintptr_t value) = 0; 77 78 // Returns whether the given FPR is accessible (read or write). 79 virtual bool IsAccessibleFPR(uint32_t reg) = 0; 80 81 // Reads the given FPR. The caller is responsible for checking the register 82 // is accessible with IsAccessibleFPR. 83 virtual uintptr_t GetFPR(uint32_t reg) = 0; 84 85 // Sets the given FPR. The caller is responsible for checking the register 86 // is accessible with IsAccessibleFPR. 87 virtual void SetFPR(uint32_t reg, uintptr_t value) = 0; 88 89 // Smashes the caller save registers. If we're throwing, we don't want to return bogus values. 90 virtual void SmashCallerSaves() = 0; 91 92 // Switches execution of the executing context to this context 93 NO_RETURN virtual void DoLongJump() = 0; 94 95 enum { 96 kBadGprBase = 0xebad6070, 97 kBadFprBase = 0xebad8070, 98 }; 99 }; 100 101 } // namespace art 102 103 #endif // ART_RUNTIME_ARCH_CONTEXT_H_ 104
