mirror of https://github.com/bsnes-emu/bsnes.git
133 lines
3.4 KiB
C++
133 lines
3.4 KiB
C++
struct GPR {
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inline operator uint32() const { return data; }
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inline auto operator=(uint32 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 n) { return operator=(data & n); }
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inline auto operator |=(uint32 n) { return operator=(data | n); }
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inline auto operator ^=(uint32 n) { return operator=(data ^ n); }
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inline auto operator +=(uint32 n) { return operator=(data + n); }
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inline auto operator -=(uint32 n) { return operator=(data - n); }
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inline auto operator *=(uint32 n) { return operator=(data * n); }
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inline auto operator /=(uint32 n) { return operator=(data / n); }
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inline auto operator %=(uint32 n) { return operator=(data % n); }
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inline auto operator<<=(uint32 n) { return operator=(data << n); }
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inline auto operator>>=(uint32 n) { return operator=(data >> n); }
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uint32 data = 0;
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function<auto () -> void> modify;
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};
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struct PSR {
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inline operator uint32() const {
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return (n << 31) + (z << 30) + (c << 29) + (v << 28)
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+ (i << 7) + (f << 6) + (t << 5) + (m << 0);
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}
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inline auto operator=(uint32 d) {
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n = d & (1 << 31);
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z = d & (1 << 30);
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c = d & (1 << 29);
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v = d & (1 << 28);
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i = d & (1 << 7);
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f = d & (1 << 6);
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t = d & (1 << 5);
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m = d & 31;
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return *this;
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}
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auto serialize(serializer&) -> void;
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bool n = false; //negative
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bool z = false; //zero
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bool c = false; //carry
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bool v = false; //overflow
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bool i = false; //irq
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bool f = false; //fiq
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bool t = false; //thumb
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unsigned m = 0; //mode
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};
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struct Pipeline {
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bool reload = 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 nonsequential = 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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auto pipeline_step() -> void;
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alwaysinline auto r(unsigned 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)processor.cpsr.m; }
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alwaysinline auto privilegedMode() const -> bool { return (Processor::Mode)processor.cpsr.m != Processor::Mode::USR; }
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alwaysinline auto exceptionMode() const -> bool { return privilegedMode() && (Processor::Mode)processor.cpsr.m != Processor::Mode::SYS; }
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