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_X86_CONTEXT_X86_H_ 18 #define ART_RUNTIME_ARCH_X86_CONTEXT_X86_H_ 19 20 #include "arch/context.h" 21 #include "base/logging.h" 22 #include "base/macros.h" 23 #include "registers_x86.h" 24 25 namespace art { 26 namespace x86 { 27 28 class X86Context : public Context { 29 public: 30 X86Context() { 31 Reset(); 32 } 33 virtual ~X86Context() {} 34 35 void Reset() OVERRIDE; 36 37 void FillCalleeSaves(const StackVisitor& fr) OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_); 38 39 void SetSP(uintptr_t new_sp) OVERRIDE { 40 SetGPR(ESP, new_sp); 41 } 42 43 void SetPC(uintptr_t new_pc) OVERRIDE { 44 eip_ = new_pc; 45 } 46 47 bool IsAccessibleGPR(uint32_t reg) OVERRIDE { 48 DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters)); 49 return gprs_[reg] != nullptr; 50 } 51 52 uintptr_t* GetGPRAddress(uint32_t reg) OVERRIDE { 53 DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters)); 54 return gprs_[reg]; 55 } 56 57 uintptr_t GetGPR(uint32_t reg) OVERRIDE { 58 DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters)); 59 DCHECK(IsAccessibleGPR(reg)); 60 return *gprs_[reg]; 61 } 62 63 void SetGPR(uint32_t reg, uintptr_t value) OVERRIDE; 64 65 bool IsAccessibleFPR(uint32_t reg) OVERRIDE { 66 DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfFloatRegisters)); 67 return fprs_[reg] != nullptr; 68 } 69 70 uintptr_t GetFPR(uint32_t reg) OVERRIDE { 71 DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfFloatRegisters)); 72 DCHECK(IsAccessibleFPR(reg)); 73 return *fprs_[reg]; 74 } 75 76 void SetFPR(uint32_t reg, uintptr_t value) OVERRIDE; 77 78 void SmashCallerSaves() OVERRIDE; 79 NO_RETURN void DoLongJump() OVERRIDE; 80 81 private: 82 // Pretend XMM registers are made of uin32_t pieces, because they are manipulated 83 // in uint32_t chunks. 84 enum { 85 XMM0_0 = 0, XMM0_1, 86 XMM1_0, XMM1_1, 87 XMM2_0, XMM2_1, 88 XMM3_0, XMM3_1, 89 XMM4_0, XMM4_1, 90 XMM5_0, XMM5_1, 91 XMM6_0, XMM6_1, 92 XMM7_0, XMM7_1, 93 kNumberOfFloatRegisters}; 94 95 // Pointers to register locations. Values are initialized to null or the special registers below. 96 uintptr_t* gprs_[kNumberOfCpuRegisters]; 97 uint32_t* fprs_[kNumberOfFloatRegisters]; 98 // Hold values for esp and eip if they are not located within a stack frame. EIP is somewhat 99 // special in that it cannot be encoded normally as a register operand to an instruction (except 100 // in 64bit addressing modes). 101 uintptr_t esp_, eip_; 102 }; 103 } // namespace x86 104 } // namespace art 105 106 #endif // ART_RUNTIME_ARCH_X86_CONTEXT_X86_H_ 107
