mirror of https://github.com/bsnes-emu/bsnes.git
122 lines
3.5 KiB
C++
122 lines
3.5 KiB
C++
struct GPR {
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inline operator uint32_t() const { return data; }
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inline auto operator=(uint32_t n) { data = n; if(modify) modify(); return *this; }
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inline auto operator=(const GPR& source) { return operator=(source.data); }
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inline auto operator &=(uint32_t n) { return operator=(data & n); }
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inline auto operator |=(uint32_t n) { return operator=(data | n); }
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inline auto operator ^=(uint32_t n) { return operator=(data ^ n); }
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inline auto operator +=(uint32_t n) { return operator=(data + n); }
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inline auto operator -=(uint32_t n) { return operator=(data - n); }
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inline auto operator *=(uint32_t n) { return operator=(data * n); }
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inline auto operator /=(uint32_t n) { return operator=(data / n); }
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inline auto operator %=(uint32_t n) { return operator=(data % n); }
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inline auto operator<<=(uint32_t n) { return operator=(data << n); }
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inline auto operator>>=(uint32_t n) { return operator=(data >> n); }
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uint32_t data = 0;
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function<auto () -> void> modify;
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};
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struct PSR {
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union {
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uint32_t data = 0;
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BooleanBitField<uint32_t, 31> n; //negative
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BooleanBitField<uint32_t, 30> z; //zero
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BooleanBitField<uint32_t, 29> c; //carry
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BooleanBitField<uint32_t, 28> v; //overflow
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BooleanBitField<uint32_t, 7> i; //irq
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BooleanBitField<uint32_t, 6> f; //fiq
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BooleanBitField<uint32_t, 5> t; //thumb
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NaturalBitField<uint32_t, 4, 0> m; //mode
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};
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PSR() = default;
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PSR(const PSR& value) { data = value.data; }
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inline operator uint() const { return data & 0xf00000ff; }
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inline auto& operator=(uint value) { return data = value, *this; }
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inline auto& operator=(const PSR& value) { return data = value.data, *this; }
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};
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struct Pipeline {
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bool reload = false;
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bool nonsequential = false;
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struct Instruction {
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uint32 address = 0;
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uint32 instruction = 0;
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};
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Instruction execute;
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Instruction decode;
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Instruction fetch;
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};
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struct Processor {
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enum class Mode : unsigned {
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USR = 0x10, //user
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FIQ = 0x11, //fast interrupt request
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IRQ = 0x12, //interrupt request
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SVC = 0x13, //supervisor (software interrupt)
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ABT = 0x17, //abort
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UND = 0x1b, //undefined
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SYS = 0x1f, //system
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};
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GPR r0, r1, r2, r3, r4, r5, r6, r7;
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struct USR {
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GPR r8, r9, r10, r11, r12, sp, lr;
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} usr;
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struct FIQ {
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GPR r8, r9, r10, r11, r12, sp, lr;
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PSR spsr;
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} fiq;
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struct IRQ {
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GPR sp, lr;
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PSR spsr;
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} irq;
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struct SVC {
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GPR sp, lr;
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PSR spsr;
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} svc;
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struct ABT {
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GPR sp, lr;
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PSR spsr;
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} abt;
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struct UND {
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GPR sp, lr;
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PSR spsr;
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} und;
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GPR pc;
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PSR cpsr;
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bool carryout = false;
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bool irqline = false;
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GPR* r[16] = {nullptr};
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PSR* spsr = nullptr;
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auto power() -> void;
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auto setMode(Mode) -> void;
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};
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Processor processor;
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Pipeline pipeline;
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bool crash = false;
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alwaysinline auto r(uint n) -> GPR& { return *processor.r[n]; }
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alwaysinline auto cpsr() -> PSR& { return processor.cpsr; }
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alwaysinline auto spsr() -> PSR& { return *processor.spsr; }
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alwaysinline auto carryout() -> bool& { return processor.carryout; }
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alwaysinline auto instruction() -> uint32 { return pipeline.execute.instruction; }
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alwaysinline auto mode() -> Processor::Mode { return (Processor::Mode)(uint)processor.cpsr.m; }
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alwaysinline auto privilegedMode() const -> bool { return (Processor::Mode)(uint)processor.cpsr.m != Processor::Mode::USR; }
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alwaysinline auto exceptionMode() const -> bool { return privilegedMode() && (Processor::Mode)(uint)processor.cpsr.m != Processor::Mode::SYS; }
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