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 "registers_x86.h" 23 24 namespace art { 25 namespace x86 { 26 27 class X86Context : public Context { 28 public: 29 X86Context() { 30 Reset(); 31 } 32 virtual ~X86Context() {} 33 34 virtual void Reset(); 35 36 virtual void FillCalleeSaves(const StackVisitor& fr); 37 38 virtual void SetSP(uintptr_t new_sp) { 39 SetGPR(ESP, new_sp); 40 } 41 42 virtual void SetPC(uintptr_t new_pc) { 43 eip_ = new_pc; 44 } 45 46 virtual uintptr_t GetGPR(uint32_t reg) { 47 const uint32_t kNumberOfCpuRegisters = 8; 48 DCHECK_LT(reg, kNumberOfCpuRegisters); 49 return *gprs_[reg]; 50 } 51 52 virtual void SetGPR(uint32_t reg, uintptr_t value); 53 54 virtual void SmashCallerSaves(); 55 virtual void DoLongJump(); 56 57 private: 58 // Pointers to register locations, floating point registers are all caller save. Values are 59 // initialized to NULL or the special registers below. 60 uintptr_t* gprs_[kNumberOfCpuRegisters]; 61 // Hold values for esp and eip if they are not located within a stack frame. EIP is somewhat 62 // special in that it cannot be encoded normally as a register operand to an instruction (except 63 // in 64bit addressing modes). 64 uintptr_t esp_, eip_; 65 }; 66 } // namespace x86 67 } // namespace art 68 69 #endif // ART_RUNTIME_ARCH_X86_CONTEXT_X86_H_ 70
