109 lines
3.5 KiB
C++
109 lines
3.5 KiB
C++
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_ARCH_CONTEXT_H_
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#define ART_RUNTIME_ARCH_CONTEXT_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "base/macros.h"
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namespace art {
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class QuickMethodFrameInfo;
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// Representation of a thread's context on the executing machine, used to implement long jumps in
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// the quick stack frame layout.
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class Context {
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public:
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// Creates a context for the running architecture
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static Context* Create();
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virtual ~Context() {}
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// Re-initializes the registers for context re-use.
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virtual void Reset() = 0;
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static uintptr_t* CalleeSaveAddress(uint8_t* frame, int num, size_t frame_size) {
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// Callee saves are held at the top of the frame
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uint8_t* save_addr = frame + frame_size - ((num + 1) * sizeof(void*));
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#if defined(__i386__) || defined(__x86_64__)
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save_addr -= sizeof(void*); // account for return address
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#endif
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return reinterpret_cast<uintptr_t*>(save_addr);
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}
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// Reads values from callee saves in the given frame. The frame also holds
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// the method that holds the layout.
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virtual void FillCalleeSaves(uint8_t* frame, const QuickMethodFrameInfo& fr) = 0;
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// Sets the stack pointer value.
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virtual void SetSP(uintptr_t new_sp) = 0;
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// Sets the program counter value.
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virtual void SetPC(uintptr_t new_pc) = 0;
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// Sets the first argument register.
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virtual void SetArg0(uintptr_t new_arg0_value) = 0;
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// Returns whether the given GPR is accessible (read or write).
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virtual bool IsAccessibleGPR(uint32_t reg) = 0;
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// Gets the given GPRs address.
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virtual uintptr_t* GetGPRAddress(uint32_t reg) = 0;
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// Reads the given GPR. The caller is responsible for checking the register
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// is accessible with IsAccessibleGPR.
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virtual uintptr_t GetGPR(uint32_t reg) = 0;
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// Sets the given GPR. The caller is responsible for checking the register
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// is accessible with IsAccessibleGPR.
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virtual void SetGPR(uint32_t reg, uintptr_t value) = 0;
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// Returns whether the given FPR is accessible (read or write).
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virtual bool IsAccessibleFPR(uint32_t reg) = 0;
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// Reads the given FPR. The caller is responsible for checking the register
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// is accessible with IsAccessibleFPR.
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virtual uintptr_t GetFPR(uint32_t reg) = 0;
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// Sets the given FPR. The caller is responsible for checking the register
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// is accessible with IsAccessibleFPR.
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virtual void SetFPR(uint32_t reg, uintptr_t value) = 0;
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// Smashes the caller save registers. If we're throwing, we don't want to return bogus values.
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virtual void SmashCallerSaves() = 0;
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// Set `new_value` to the physical register containing the dex PC pointer in
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// an nterp frame.
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virtual void SetNterpDexPC(uintptr_t new_value ATTRIBUTE_UNUSED) {
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abort();
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}
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// Switches execution of the executing context to this context
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NO_RETURN virtual void DoLongJump() = 0;
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enum {
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kBadGprBase = 0xebad6070,
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kBadFprBase = 0xebad8070,
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};
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};
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} // namespace art
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#endif // ART_RUNTIME_ARCH_CONTEXT_H_
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