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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_CONTEXT_H_
#define ART_RUNTIME_ARCH_CONTEXT_H_
#include <stddef.h>
#include <stdint.h>
#include "base/mutex.h"
namespace art {
class StackVisitor;
// Representation of a thread's context on the executing machine, used to implement long jumps in
// the quick stack frame layout.
class Context {
public:
// Creates a context for the running architecture
static Context* Create();
virtual ~Context() {}
// Re-initializes the registers for context re-use.
virtual void Reset() = 0;
// Reads values from callee saves in the given frame. The frame also holds
// the method that holds the layout.
virtual void FillCalleeSaves(const StackVisitor& fr)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) = 0;
// Sets the stack pointer value.
virtual void SetSP(uintptr_t new_sp) = 0;
// Sets the program counter value.
virtual void SetPC(uintptr_t new_pc) = 0;
// Gets the given GPRs address.
virtual uintptr_t* GetGPRAddress(uint32_t reg) = 0;
// Reads the given GPR. Returns true if we successfully read the register and
// set its value into 'val', returns false otherwise.
virtual bool GetGPR(uint32_t reg, uintptr_t* val) = 0;
// Sets the given GPR. Returns true if we successfully write the given value
// into the register, returns false otherwise.
virtual bool SetGPR(uint32_t reg, uintptr_t value) = 0;
// Reads the given FPR. Returns true if we successfully read the register and
// set its value into 'val', returns false otherwise.
virtual bool GetFPR(uint32_t reg, uintptr_t* val) = 0;
// Sets the given FPR. Returns true if we successfully write the given value
// into the register, returns false otherwise.
virtual bool SetFPR(uint32_t reg, uintptr_t value) = 0;
// Smashes the caller save registers. If we're throwing, we don't want to return bogus values.
virtual void SmashCallerSaves() = 0;
// Switches execution of the executing context to this context
virtual void DoLongJump() = 0;
protected:
enum {
kBadGprBase = 0xebad6070,
kBadFprBase = 0xebad8070,
};
};
} // namespace art
#endif // ART_RUNTIME_ARCH_CONTEXT_H_
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