1 /* 2 * Copyright (C) 2014 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_ARM64_CONTEXT_ARM64_H_ 18 #define ART_RUNTIME_ARCH_ARM64_CONTEXT_ARM64_H_ 19 20 #include <android-base/logging.h> 21 22 #include "arch/context.h" 23 #include "base/macros.h" 24 #include "registers_arm64.h" 25 26 namespace art { 27 namespace arm64 { 28 29 class Arm64Context final : public Context { 30 public: Arm64Context()31 Arm64Context() { 32 Reset(); 33 } 34 ~Arm64Context()35 ~Arm64Context() {} 36 37 void Reset() override; 38 39 void FillCalleeSaves(uint8_t* frame, const QuickMethodFrameInfo& fr) override; 40 SetSP(uintptr_t new_sp)41 void SetSP(uintptr_t new_sp) override { 42 SetGPR(SP, new_sp); 43 } 44 SetPC(uintptr_t new_lr)45 void SetPC(uintptr_t new_lr) override { 46 SetGPR(kPC, new_lr); 47 } 48 SetNterpDexPC(uintptr_t dex_pc_ptr)49 void SetNterpDexPC(uintptr_t dex_pc_ptr) override { 50 SetGPR(X22, dex_pc_ptr); 51 } 52 SetArg0(uintptr_t new_arg0_value)53 void SetArg0(uintptr_t new_arg0_value) override { 54 SetGPR(X0, new_arg0_value); 55 } 56 IsAccessibleGPR(uint32_t reg)57 bool IsAccessibleGPR(uint32_t reg) override { 58 DCHECK_LT(reg, arraysize(gprs_)); 59 return gprs_[reg] != nullptr; 60 } 61 GetGPRAddress(uint32_t reg)62 uintptr_t* GetGPRAddress(uint32_t reg) override { 63 DCHECK_LT(reg, arraysize(gprs_)); 64 return gprs_[reg]; 65 } 66 GetGPR(uint32_t reg)67 uintptr_t GetGPR(uint32_t reg) override { 68 // Note: PC isn't an available GPR (outside of internals), so don't allow retrieving the value. 69 DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfXRegisters)); 70 DCHECK(IsAccessibleGPR(reg)); 71 return *gprs_[reg]; 72 } 73 74 void SetGPR(uint32_t reg, uintptr_t value) override; 75 IsAccessibleFPR(uint32_t reg)76 bool IsAccessibleFPR(uint32_t reg) override { 77 DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfDRegisters)); 78 return fprs_[reg] != nullptr; 79 } 80 GetFPR(uint32_t reg)81 uintptr_t GetFPR(uint32_t reg) override { 82 DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfDRegisters)); 83 DCHECK(IsAccessibleFPR(reg)); 84 return *fprs_[reg]; 85 } 86 87 void SetFPR(uint32_t reg, uintptr_t value) override; 88 89 void SmashCallerSaves() override; 90 NO_RETURN void DoLongJump() override; 91 92 static constexpr size_t kPC = kNumberOfXRegisters; 93 94 private: 95 // Pointers to register locations, initialized to null or the specific registers below. We need 96 // an additional one for the PC. 97 uintptr_t* gprs_[kNumberOfXRegisters + 1]; 98 uint64_t * fprs_[kNumberOfDRegisters]; 99 // Hold values for sp, pc and arg0 if they are not located within a stack frame. 100 uintptr_t sp_, pc_, arg0_; 101 }; 102 103 } // namespace arm64 104 } // namespace art 105 106 #endif // ART_RUNTIME_ARCH_ARM64_CONTEXT_ARM64_H_ 107