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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_ARCH_X86_CONTEXT_X86_H_
#define ART_RUNTIME_ARCH_X86_CONTEXT_X86_H_
#include "arch/context.h"
#include "base/logging.h"
#include "registers_x86.h"
namespace art {
namespace x86 {
class X86Context : public Context {
public:
X86Context() {
Reset();
}
virtual ~X86Context() {}
void Reset() OVERRIDE;
void FillCalleeSaves(const StackVisitor& fr) OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
void SetSP(uintptr_t new_sp) OVERRIDE {
bool success = SetGPR(ESP, new_sp);
CHECK(success) << "Failed to set ESP register";
}
void SetPC(uintptr_t new_pc) OVERRIDE {
eip_ = new_pc;
}
uintptr_t* GetGPRAddress(uint32_t reg) OVERRIDE {
DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters));
return gprs_[reg];
}
bool GetGPR(uint32_t reg, uintptr_t* val) OVERRIDE {
DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCpuRegisters));
if (gprs_[reg] == nullptr) {
return false;
} else {
DCHECK(val != nullptr);
*val = *gprs_[reg];
return true;
}
}
bool SetGPR(uint32_t reg, uintptr_t value) OVERRIDE;
bool GetFPR(uint32_t reg, uintptr_t* val) OVERRIDE {
LOG(FATAL) << "Floating-point registers are all caller save in X86";
return false;
}
bool SetFPR(uint32_t reg, uintptr_t value) OVERRIDE {
LOG(FATAL) << "Floating-point registers are all caller save in X86";
return false;
}
void SmashCallerSaves() OVERRIDE;
void DoLongJump() OVERRIDE;
private:
// Pointers to register locations, floating point registers are all caller save. Values are
// initialized to NULL or the special registers below.
uintptr_t* gprs_[kNumberOfCpuRegisters];
// Hold values for esp and eip if they are not located within a stack frame. EIP is somewhat
// special in that it cannot be encoded normally as a register operand to an instruction (except
// in 64bit addressing modes).
uintptr_t esp_, eip_;
};
} // namespace x86
} // namespace art
#endif // ART_RUNTIME_ARCH_X86_CONTEXT_X86_H_
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