125 lines
3.9 KiB
C++
125 lines
3.9 KiB
C++
/* This file is part of the dynarmic project.
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* Copyright (c) 2016 MerryMage
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* This software may be used and distributed according to the terms of the GNU
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* General Public License version 2 or any later version.
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*/
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#pragma once
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#include <functional>
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#include <iosfwd>
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#include <tuple>
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#include "common/common_types.h"
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#include "frontend/A32/FPSCR.h"
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#include "frontend/A32/PSR.h"
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#include "frontend/ir/location_descriptor.h"
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namespace Dynarmic::A32 {
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/**
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* LocationDescriptor describes the location of a basic block.
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* The location is not solely based on the PC because other flags influence the way
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* instructions should be translated. The CPSR.T flag is most notable since it
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* tells us if the processor is in Thumb or Arm mode.
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*/
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class LocationDescriptor {
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public:
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// Indicates bits that should be preserved within descriptors.
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static constexpr u32 CPSR_MODE_MASK = 0x00000220;
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static constexpr u32 FPSCR_MODE_MASK = 0x03F79F00;
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LocationDescriptor(u32 arm_pc, PSR cpsr, FPSCR fpscr)
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: arm_pc(arm_pc), cpsr(cpsr.Value() & CPSR_MODE_MASK), fpscr(fpscr.Value() & FPSCR_MODE_MASK) {}
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explicit LocationDescriptor(const IR::LocationDescriptor& o) {
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arm_pc = o.Value() >> 32;
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cpsr.T(o.Value() & 1);
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cpsr.E(o.Value() & 2);
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fpscr = o.Value() & FPSCR_MODE_MASK;
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}
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u32 PC() const { return arm_pc; }
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bool TFlag() const { return cpsr.T(); }
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bool EFlag() const { return cpsr.E(); }
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A32::PSR CPSR() const { return cpsr; }
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A32::FPSCR FPSCR() const { return fpscr; }
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bool operator == (const LocationDescriptor& o) const {
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return std::tie(arm_pc, cpsr, fpscr) == std::tie(o.arm_pc, o.cpsr, o.fpscr);
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}
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bool operator != (const LocationDescriptor& o) const {
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return !operator==(o);
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}
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LocationDescriptor SetPC(u32 new_arm_pc) const {
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return LocationDescriptor(new_arm_pc, cpsr, fpscr);
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}
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LocationDescriptor AdvancePC(int amount) const {
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return LocationDescriptor(static_cast<u32>(arm_pc + amount), cpsr, fpscr);
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}
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LocationDescriptor SetTFlag(bool new_tflag) const {
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PSR new_cpsr = cpsr;
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new_cpsr.T(new_tflag);
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return LocationDescriptor(arm_pc, new_cpsr, fpscr);
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}
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LocationDescriptor SetEFlag(bool new_eflag) const {
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PSR new_cpsr = cpsr;
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new_cpsr.E(new_eflag);
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return LocationDescriptor(arm_pc, new_cpsr, fpscr);
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}
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LocationDescriptor SetFPSCR(u32 new_fpscr) const {
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return LocationDescriptor(arm_pc, cpsr, A32::FPSCR{new_fpscr & FPSCR_MODE_MASK});
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}
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u64 UniqueHash() const {
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// This value MUST BE UNIQUE.
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// This calculation has to match up with EmitX64::EmitTerminalPopRSBHint
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u64 pc_u64 = u64(arm_pc) << 32;
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u64 fpscr_u64 = u64(fpscr.Value());
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u64 t_u64 = cpsr.T() ? 1 : 0;
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u64 e_u64 = cpsr.E() ? 2 : 0;
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return pc_u64 | fpscr_u64 | t_u64 | e_u64;
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}
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operator IR::LocationDescriptor() const {
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return IR::LocationDescriptor{UniqueHash()};
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}
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private:
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u32 arm_pc; ///< Current program counter value.
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PSR cpsr; ///< Current program status register.
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A32::FPSCR fpscr; ///< Floating point status control register.
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};
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/**
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* Provides a string representation of a LocationDescriptor.
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*
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* @param o Output stream
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* @param descriptor The descriptor to get a string representation of
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*/
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std::ostream& operator<<(std::ostream& o, const LocationDescriptor& descriptor);
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} // namespace Dynarmic::A32
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namespace std {
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template <>
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struct less<Dynarmic::A32::LocationDescriptor> {
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bool operator()(const Dynarmic::A32::LocationDescriptor& x, const Dynarmic::A32::LocationDescriptor& y) const {
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return x.UniqueHash() < y.UniqueHash();
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}
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};
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template <>
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struct hash<Dynarmic::A32::LocationDescriptor> {
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size_t operator()(const Dynarmic::A32::LocationDescriptor& x) const {
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return std::hash<u64>()(x.UniqueHash());
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}
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};
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} // namespace std
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