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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 <stdlib.h>
#include "base/macros.h"
namespace art {
class QuickMethodFrameInfo;
// 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;
static uintptr_t* CalleeSaveAddress(uint8_t* frame, int num, size_t frame_size) {
// Callee saves are held at the top of the frame
uint8_t* save_addr = frame + frame_size - ((num + 1) * sizeof(void*));
#if defined(__i386__) || defined(__x86_64__)
save_addr -= sizeof(void*); // account for return address
#endif
return reinterpret_cast<uintptr_t*>(save_addr);
}
// Reads values from callee saves in the given frame. The frame also holds
// the method that holds the layout.
virtual void FillCalleeSaves(uint8_t* frame, const QuickMethodFrameInfo& fr) = 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;
// Sets the first argument register.
virtual void SetArg0(uintptr_t new_arg0_value) = 0;
// Returns whether the given GPR is accessible (read or write).
virtual bool IsAccessibleGPR(uint32_t reg) = 0;
// Gets the given GPRs address.
virtual uintptr_t* GetGPRAddress(uint32_t reg) = 0;
// Reads the given GPR. The caller is responsible for checking the register
// is accessible with IsAccessibleGPR.
virtual uintptr_t GetGPR(uint32_t reg) = 0;
// Sets the given GPR. The caller is responsible for checking the register
// is accessible with IsAccessibleGPR.
virtual void SetGPR(uint32_t reg, uintptr_t value) = 0;
// Returns whether the given FPR is accessible (read or write).
virtual bool IsAccessibleFPR(uint32_t reg) = 0;
// Reads the given FPR. The caller is responsible for checking the register
// is accessible with IsAccessibleFPR.
virtual uintptr_t GetFPR(uint32_t reg) = 0;
// Sets the given FPR. The caller is responsible for checking the register
// is accessible with IsAccessibleFPR.
virtual void 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;
// Set `new_value` to the physical register containing the dex PC pointer in
// an nterp frame.
virtual void SetNterpDexPC(uintptr_t new_value ATTRIBUTE_UNUSED) {
abort();
}
// Switches execution of the executing context to this context
NO_RETURN virtual void DoLongJump() = 0;
enum {
kBadGprBase = 0xebad6070,
kBadFprBase = 0xebad8070,
};
};
} // namespace art
#endif // ART_RUNTIME_ARCH_CONTEXT_H_
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