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1964 lines
71 KiB
C++
1964 lines
71 KiB
C++
//
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// Z80.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 14/05/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#ifndef Z80_hpp
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#define Z80_hpp
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#include <cstdint>
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#include <cstring>
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#include <cstdio>
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#include <vector>
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#include "../RegisterSizes.hpp"
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namespace CPU {
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namespace Z80 {
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/*
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The list of registers that can be accessed via @c set_value_of_register and @c set_value_of_register.
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*/
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enum Register {
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ProgramCounter,
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StackPointer,
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A, Flags, AF,
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B, C, BC,
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D, E, DE,
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H, L, HL,
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ADash, FlagsDash, AFDash,
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BDash, CDash, BCDash,
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DDash, EDash, DEDash,
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HDash, LDash, HLDash,
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IXh, IXl, IX,
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IYh, IYl, IY,
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R, I, Refresh,
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IFF1, IFF2, IM
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};
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/*
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Flags as defined on the Z80; can be used to decode the result of @c get_flags or to form a value for @c set_flags.
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*/
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enum Flag: uint8_t {
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Sign = 0x80,
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Zero = 0x40,
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Bit5 = 0x20,
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HalfCarry = 0x10,
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Bit3 = 0x08,
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Parity = 0x04,
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Overflow = 0x04,
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Subtract = 0x02,
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Carry = 0x01
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};
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/*!
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Subclasses will be given the task of performing bus operations, allowing them to provide whatever interface they like
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between a Z80 and the rest of the system. @c BusOperation lists the types of bus operation that may be requested.
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*/
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struct PartialMachineCycle {
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enum Operation {
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ReadOpcodeStart = 0,
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ReadOpcodeWait,
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Read,
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Write,
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Input,
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Output,
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Interrupt,
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Refresh,
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Internal,
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BusAcknowledge,
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ReadWait,
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WriteWait,
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InputWait,
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OutputWait,
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InterruptWait,
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ReadStart,
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WriteStart,
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InputStart,
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OutputStart,
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} operation;
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int length;
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uint16_t *address;
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uint8_t *value;
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bool was_requested;
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inline bool expects_action() const {
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return operation <= Operation::Interrupt;
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}
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inline bool is_terminal() const {
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return operation <= Operation::BusAcknowledge;
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}
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inline bool is_wait() const {
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return operation >= Operation::ReadWait && operation <= Operation::InterruptWait;
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}
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};
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// Elemental bus operations
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#define ReadOpcodeStart() {PartialMachineCycle::ReadOpcodeStart, 2, &pc_.full, &operation_, false}
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#define ReadOpcodeWait(length, f) {PartialMachineCycle::ReadOpcodeWait, length, &pc_.full, &operation_, f}
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#define Refresh(len) {PartialMachineCycle::Refresh, len, &refresh_addr_.full, nullptr, false}
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#define ReadStart(addr, val) {PartialMachineCycle::ReadStart, 2, &addr.full, &val, false}
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#define ReadWait(l, addr, val, f) {PartialMachineCycle::ReadWait, l, &addr.full, &val, f}
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#define ReadEnd(addr, val) {PartialMachineCycle::Read, 1, &addr.full, &val, false}
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#define WriteStart(addr, val) {PartialMachineCycle::WriteStart, 2, &addr.full, &val, false}
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#define WriteWait(l, addr, val, f) {PartialMachineCycle::WriteWait, l, &addr.full, &val, f}
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#define WriteEnd(addr, val) {PartialMachineCycle::Write, 1, &addr.full, &val, false}
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#define InputStart(addr, val) {PartialMachineCycle::InputStart, 2, &addr.full, &val, false}
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#define InputWait(addr, val, f) {PartialMachineCycle::InputWait, 1, &addr.full, &val, f}
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#define InputEnd(addr, val) {PartialMachineCycle::Input, 1, &addr.full, &val, false}
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#define OutputStart(addr, val) {PartialMachineCycle::OutputStart, 2, &addr.full, &val, false}
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#define OutputWait(addr, val, f) {PartialMachineCycle::OutputWait, 1, &addr.full, &val, f}
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#define OutputEnd(addr, val) {PartialMachineCycle::Output, 1, &addr.full, &val, false}
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#define IntAck(length, val) {PartialMachineCycle::Interrupt, length, nullptr, &val, false}
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#define IntWait(val) {PartialMachineCycle::InterruptWait, 1, nullptr, &val, true}
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// A wrapper to express a bus operation as a micro-op
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#define BusOp(op) {MicroOp::BusOperation, nullptr, nullptr, op}
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// Compound bus operations, as micro-ops
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#define Read3(addr, val) BusOp(ReadStart(addr, val)), BusOp(ReadWait(1, addr, val, true)), BusOp(ReadEnd(addr, val))
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#define Read4(addr, val) BusOp(ReadStart(addr, val)), BusOp(ReadWait(1, addr, val, false)), BusOp(ReadWait(1, addr, val, true)), BusOp(ReadEnd(addr, val))
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#define Read5(addr, val) BusOp(ReadStart(addr, val)), BusOp(ReadWait(2, addr, val, false)), BusOp(ReadWait(1, addr, val, true)), BusOp(ReadEnd(addr, val))
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#define Write3(addr, val) BusOp(WriteStart(addr, val)), BusOp(WriteWait(1, addr, val, true)), BusOp(WriteEnd(addr, val))
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#define Write5(addr, val) BusOp(WriteStart(addr, val)), BusOp(WriteWait(2, addr, val, false)), BusOp(WriteWait(1, addr, val, true)), BusOp(WriteEnd(addr, val))
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#define Input(addr, val) BusOp(InputStart(addr, val)), BusOp(InputWait(addr, val, false)), BusOp(InputWait(addr, val, true)), BusOp(InputEnd(addr, val))
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#define Output(addr, val) BusOp(OutputStart(addr, val)), BusOp(OutputWait(addr, val, false)), BusOp(OutputWait(addr, val, true)), BusOp(OutputEnd(addr, val))
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#define InternalOperation(len) {MicroOp::BusOperation, nullptr, nullptr, {PartialMachineCycle::Internal, len, nullptr, nullptr, false}}
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/// A sequence is a series of micro-ops that ends in a move-to-next-program operation.
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#define Sequence(...) { __VA_ARGS__, {MicroOp::MoveToNextProgram} }
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/// An instruction is the part of an instruction that follows instruction fetch; it should include two or more refresh cycles and then the work of the instruction.
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#define Instr(r, ...) Sequence(BusOp(Refresh(r)), __VA_ARGS__)
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/// A standard instruction is one with the most normal timing: two cycles of refresh, then the work.
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#define StdInstr(...) Instr(2, __VA_ARGS__)
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// Assumption made: those instructions that are rated with an opcode fetch greater than four cycles spend the extra time
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// providing a lengthened refresh cycle. I assume this because the CPU doesn't have foresight and presumably spends the
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// normal refresh time decoding. So if it gets to cycle four and realises it has two more cycles of work, I have assumed
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// it simply maintains the refresh state for an extra two cycles.
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/*!
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@abstact An abstract base class for emulation of a Z80 processor via the curiously recurring template pattern/f-bounded polymorphism.
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@discussion Subclasses should implement @c perform_machine_cycle in
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order to provide the bus on which the Z80 operates and @c flush(), which is called upon completion of a continuous run
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of cycles to allow a subclass to bring any on-demand activities up to date.
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*/
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template <class T> class Processor {
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private:
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uint8_t a_;
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RegisterPair bc_, de_, hl_;
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RegisterPair afDash_, bcDash_, deDash_, hlDash_;
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RegisterPair ix_, iy_, pc_, sp_;
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RegisterPair ir_, refresh_addr_;
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bool iff1_, iff2_;
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int interrupt_mode_;
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uint16_t pc_increment_;
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uint8_t sign_result_; // the sign flag is set if the value in sign_result_ is negative
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uint8_t zero_result_; // the zero flag is set if the value in zero_result_ is zero
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uint8_t half_carry_result_; // the half-carry flag is set if bit 4 of half_carry_result_ is set
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uint8_t bit53_result_; // the bit 3 and 5 flags are set if the corresponding bits of bit53_result_ are set
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uint8_t parity_overflow_result_; // the parity/overflow flag is set if the corresponding bit of parity_overflow_result_ is set
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uint8_t subtract_flag_; // contains a copy of the subtract flag in isolation
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uint8_t carry_result_; // the carry flag is set if bit 0 of carry_result_ is set
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uint8_t halt_mask_;
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int number_of_cycles_;
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enum Interrupt: uint8_t {
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IRQ = 0x01,
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NMI = 0x02,
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Reset = 0x04,
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PowerOn = 0x08
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};
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uint8_t request_status_;
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uint8_t last_request_status_;
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bool irq_line_, nmi_line_;
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bool bus_request_line_;
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bool wait_line_;
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uint8_t operation_;
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RegisterPair temp16_, memptr_;
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uint8_t temp8_;
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struct MicroOp {
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enum Type {
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BusOperation,
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DecodeOperation,
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DecodeOperationNoRChange,
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MoveToNextProgram,
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Increment8,
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Increment16,
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Decrement8,
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Decrement16,
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Move8,
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Move16,
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IncrementPC,
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AssembleAF,
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DisassembleAF,
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And,
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Or,
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Xor,
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TestNZ,
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TestZ,
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TestNC,
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TestC,
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TestPO,
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TestPE,
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TestP,
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TestM,
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ADD16, ADC16, SBC16,
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CP8, SUB8, SBC8, ADD8, ADC8,
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NEG,
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ExDEHL, ExAFAFDash, EXX,
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EI, DI, IM,
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LDI, LDIR, LDD, LDDR,
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CPI, CPIR, CPD, CPDR,
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INI, INIR, IND, INDR,
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OUTI, OUTD, OUT_R,
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RLA, RLCA, RRA, RRCA,
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RLC, RRC, RL, RR,
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SLA, SRA, SLL, SRL,
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RLD, RRD,
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SetInstructionPage,
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CalculateIndexAddress,
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BeginNMI,
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BeginIRQ,
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BeginIRQMode0,
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RETN,
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JumpTo66,
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HALT,
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DJNZ,
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DAA,
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CPL,
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SCF,
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CCF,
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RES,
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BIT,
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SET,
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CalculateRSTDestination,
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SetAFlags,
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SetInFlags,
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SetZero,
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IndexedPlaceHolder,
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Reset
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};
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Type type;
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void *source;
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void *destination;
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PartialMachineCycle machine_cycle;
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};
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const MicroOp *scheduled_program_counter_;
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struct InstructionPage {
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std::vector<MicroOp *> instructions;
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std::vector<MicroOp> all_operations;
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std::vector<MicroOp> fetch_decode_execute;
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MicroOp *fetch_decode_execute_data;
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uint8_t r_step;
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bool is_indexed;
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InstructionPage() : r_step(1), is_indexed(false) {}
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};
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std::vector<MicroOp> conditional_call_untaken_program_;
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std::vector<MicroOp> reset_program_;
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std::vector<MicroOp> irq_program_[3];
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std::vector<MicroOp> nmi_program_;
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InstructionPage *current_instruction_page_;
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InstructionPage base_page_;
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InstructionPage ed_page_;
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InstructionPage fd_page_;
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InstructionPage dd_page_;
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InstructionPage cb_page_;
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InstructionPage fdcb_page_;
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InstructionPage ddcb_page_;
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/* The following are helper macros that define common parts of instructions */
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#define Inc16(r) {(&r == &pc_) ? MicroOp::IncrementPC : MicroOp::Increment16, &r.full}
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#define ReadInc(addr, val) Read3(addr, val), Inc16(addr)
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#define Read4Inc(addr, val) Read4(addr, val), Inc16(addr)
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#define Read5Inc(addr, val) Read5(addr, val), Inc16(addr)
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#define WriteInc(addr, val) Write3(addr, val), {MicroOp::Increment16, &addr.full}
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#define Read16Inc(addr, val) ReadInc(addr, val.bytes.low), ReadInc(addr, val.bytes.high)
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#define Read16(addr, val) ReadInc(addr, val.bytes.low), Read3(addr, val.bytes.high)
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#define Write16(addr, val) WriteInc(addr, val.bytes.low), Write3(addr, val.bytes.high)
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#define INDEX() {MicroOp::IndexedPlaceHolder}, ReadInc(pc_, temp8_), InternalOperation(5), {MicroOp::CalculateIndexAddress, &index}
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#define FINDEX() {MicroOp::IndexedPlaceHolder}, ReadInc(pc_, temp8_), {MicroOp::CalculateIndexAddress, &index}
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#define INDEX_ADDR() (add_offsets ? memptr_ : index)
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#define Push(x) {MicroOp::Decrement16, &sp_.full}, Write3(sp_, x.bytes.high), {MicroOp::Decrement16, &sp_.full}, Write3(sp_, x.bytes.low)
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#define Pop(x) Read3(sp_, x.bytes.low), {MicroOp::Increment16, &sp_.full}, Read3(sp_, x.bytes.high), {MicroOp::Increment16, &sp_.full}
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#define Push8(x) {MicroOp::Decrement16, &sp_.full}, Write3(sp_, x.bytes.high), {MicroOp::Decrement16, &sp_.full}, Write5(sp_, x.bytes.low)
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#define Pop7(x) Read3(sp_, x.bytes.low), {MicroOp::Increment16, &sp_.full}, Read4(sp_, x.bytes.high), {MicroOp::Increment16, &sp_.full}
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/* The following are actual instructions */
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#define NOP Sequence(BusOp(Refresh(2)))
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#define JP(cc) StdInstr(Read16Inc(pc_, temp16_), {MicroOp::cc, nullptr}, {MicroOp::Move16, &temp16_.full, &pc_.full})
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#define CALL(cc) StdInstr(ReadInc(pc_, temp16_.bytes.low), {MicroOp::cc, conditional_call_untaken_program_.data()}, Read4Inc(pc_, temp16_.bytes.high), Push(pc_), {MicroOp::Move16, &temp16_.full, &pc_.full})
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#define RET(cc) Instr(3, {MicroOp::cc, nullptr}, Pop(memptr_), {MicroOp::Move16, &memptr_.full, &pc_.full})
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#define JR(cc) StdInstr(ReadInc(pc_, temp8_), {MicroOp::cc, nullptr}, InternalOperation(5), {MicroOp::CalculateIndexAddress, &pc_.full}, {MicroOp::Move16, &memptr_.full, &pc_.full})
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#define RST() Instr(3, {MicroOp::CalculateRSTDestination}, Push(pc_), {MicroOp::Move16, &memptr_.full, &pc_.full})
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#define LD(a, b) StdInstr({MicroOp::Move8, &b, &a})
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#define LD_GROUP(r, ri) \
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LD(r, bc_.bytes.high), LD(r, bc_.bytes.low), LD(r, de_.bytes.high), LD(r, de_.bytes.low), \
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LD(r, index.bytes.high), LD(r, index.bytes.low), \
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StdInstr(INDEX(), Read3(INDEX_ADDR(), temp8_), {MicroOp::Move8, &temp8_, &ri}), \
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LD(r, a_)
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#define READ_OP_GROUP(op) \
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StdInstr({MicroOp::op, &bc_.bytes.high}), StdInstr({MicroOp::op, &bc_.bytes.low}), \
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StdInstr({MicroOp::op, &de_.bytes.high}), StdInstr({MicroOp::op, &de_.bytes.low}), \
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StdInstr({MicroOp::op, &index.bytes.high}), StdInstr({MicroOp::op, &index.bytes.low}), \
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StdInstr(INDEX(), Read3(INDEX_ADDR(), temp8_), {MicroOp::op, &temp8_}), \
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StdInstr({MicroOp::op, &a_})
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#define READ_OP_GROUP_D(op) \
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StdInstr({MicroOp::op, &bc_.bytes.high}), StdInstr({MicroOp::op, &bc_.bytes.low}), \
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StdInstr({MicroOp::op, &de_.bytes.high}), StdInstr({MicroOp::op, &de_.bytes.low}), \
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StdInstr({MicroOp::op, &index.bytes.high}), StdInstr({MicroOp::op, &index.bytes.low}), \
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StdInstr(INDEX(), Read4(INDEX_ADDR(), temp8_), {MicroOp::op, &temp8_}), \
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StdInstr({MicroOp::op, &a_})
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#define RMW(x, op, ...) StdInstr(INDEX(), Read4(INDEX_ADDR(), x), {MicroOp::op, &x}, Write3(INDEX_ADDR(), x))
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#define RMWI(x, op, ...) StdInstr(Read4(INDEX_ADDR(), x), {MicroOp::op, &x}, Write3(INDEX_ADDR(), x))
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#define MODIFY_OP_GROUP(op) \
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StdInstr({MicroOp::op, &bc_.bytes.high}), StdInstr({MicroOp::op, &bc_.bytes.low}), \
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StdInstr({MicroOp::op, &de_.bytes.high}), StdInstr({MicroOp::op, &de_.bytes.low}), \
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StdInstr({MicroOp::op, &index.bytes.high}), StdInstr({MicroOp::op, &index.bytes.low}), \
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RMW(temp8_, op), \
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StdInstr({MicroOp::op, &a_})
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#define IX_MODIFY_OP_GROUP(op) \
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RMWI(bc_.bytes.high, op), \
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RMWI(bc_.bytes.low, op), \
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RMWI(de_.bytes.high, op), \
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RMWI(de_.bytes.low, op), \
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RMWI(hl_.bytes.high, op), \
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RMWI(hl_.bytes.low, op), \
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RMWI(temp8_, op), \
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RMWI(a_, op)
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#define IX_READ_OP_GROUP(op) \
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StdInstr(Read4(INDEX_ADDR(), temp8_), {MicroOp::op, &temp8_}), \
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StdInstr(Read4(INDEX_ADDR(), temp8_), {MicroOp::op, &temp8_}), \
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StdInstr(Read4(INDEX_ADDR(), temp8_), {MicroOp::op, &temp8_}), \
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StdInstr(Read4(INDEX_ADDR(), temp8_), {MicroOp::op, &temp8_}), \
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StdInstr(Read4(INDEX_ADDR(), temp8_), {MicroOp::op, &temp8_}), \
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StdInstr(Read4(INDEX_ADDR(), temp8_), {MicroOp::op, &temp8_}), \
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StdInstr(Read4(INDEX_ADDR(), temp8_), {MicroOp::op, &temp8_}), \
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StdInstr(Read4(INDEX_ADDR(), temp8_), {MicroOp::op, &temp8_})
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#define ADD16(d, s) StdInstr(InternalOperation(4), InternalOperation(3), {MicroOp::ADD16, &s.full, &d.full})
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#define ADC16(d, s) StdInstr(InternalOperation(4), InternalOperation(3), {MicroOp::ADC16, &s.full, &d.full})
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#define SBC16(d, s) StdInstr(InternalOperation(4), InternalOperation(3), {MicroOp::SBC16, &s.full, &d.full})
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#define isTerminal(n) (n == MicroOp::MoveToNextProgram || n == MicroOp::DecodeOperation || n == MicroOp::DecodeOperationNoRChange)
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typedef MicroOp InstructionTable[256][30];
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void assemble_page(InstructionPage &target, InstructionTable &table, bool add_offsets) {
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size_t number_of_micro_ops = 0;
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size_t lengths[256];
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// Count number of micro-ops required.
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for(int c = 0; c < 256; c++) {
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size_t length = 0;
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while(!isTerminal(table[c][length].type)) length++;
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length++;
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lengths[c] = length;
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number_of_micro_ops += length;
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}
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// Allocate a landing area.
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target.all_operations.resize(number_of_micro_ops);
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target.instructions.resize(256, nullptr);
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// Copy in all programs and set pointers.
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size_t destination = 0;
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for(size_t c = 0; c < 256; c++) {
|
||
target.instructions[c] = &target.all_operations[destination];
|
||
for(int t = 0; t < lengths[c];) {
|
||
// Skip zero-length bus cycles.
|
||
if(table[c][t].type == MicroOp::BusOperation && table[c][t].machine_cycle.length == 0) {
|
||
t++;
|
||
continue;
|
||
}
|
||
|
||
// If an index placeholder is hit then drop it, and if offsets aren't being added,
|
||
// then also drop the indexing that follows, which is assumed to be everything
|
||
// up to and including the next ::CalculateIndexAddress. Coupled to the INDEX() macro.
|
||
if(table[c][t].type == MicroOp::IndexedPlaceHolder) {
|
||
t++;
|
||
if(!add_offsets) {
|
||
while(table[c][t].type != MicroOp::CalculateIndexAddress) t++;
|
||
t++;
|
||
}
|
||
}
|
||
target.all_operations[destination] = table[c][t];
|
||
destination++;
|
||
t++;
|
||
}
|
||
}
|
||
}
|
||
|
||
void assemble_ed_page(InstructionPage &target) {
|
||
#define IN_C(r) StdInstr(Input(bc_, r), {MicroOp::SetInFlags, &r})
|
||
#define OUT_C(r) StdInstr(Output(bc_, r))
|
||
#define IN_OUT(r) IN_C(r), OUT_C(r)
|
||
|
||
#define NOP_ROW() NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP, NOP
|
||
InstructionTable ed_program_table = {
|
||
NOP_ROW(), /* 0x00 */
|
||
NOP_ROW(), /* 0x10 */
|
||
NOP_ROW(), /* 0x20 */
|
||
NOP_ROW(), /* 0x30 */
|
||
/* 0x40 IN B, (C); 0x41 OUT (C), B */ IN_OUT(bc_.bytes.high),
|
||
/* 0x42 SBC HL, BC */ SBC16(hl_, bc_), /* 0x43 LD (nn), BC */ StdInstr(Read16Inc(pc_, temp16_), Write16(temp16_, bc_)),
|
||
/* 0x44 NEG */ StdInstr({MicroOp::NEG}), /* 0x45 RETN */ StdInstr(Pop(pc_), {MicroOp::RETN}),
|
||
/* 0x46 IM 0 */ StdInstr({MicroOp::IM}), /* 0x47 LD I, A */ Instr(3, {MicroOp::Move8, &a_, &ir_.bytes.high}),
|
||
/* 0x40 IN B, (C); 0x41 OUT (C), B */ IN_OUT(bc_.bytes.low),
|
||
/* 0x4a ADC HL, BC */ ADC16(hl_, bc_), /* 0x4b LD BC, (nn) */ StdInstr(Read16Inc(pc_, temp16_), Read16(temp16_, bc_)),
|
||
/* 0x4c NEG */ StdInstr({MicroOp::NEG}), /* 0x4d RETI */ StdInstr(Pop(pc_), {MicroOp::RETN}),
|
||
/* 0x4e IM 0/1 */ StdInstr({MicroOp::IM}), /* 0x4f LD R, A */ Instr(3, {MicroOp::Move8, &a_, &ir_.bytes.low}),
|
||
/* 0x40 IN B, (C); 0x41 OUT (C), B */ IN_OUT(de_.bytes.high),
|
||
/* 0x52 SBC HL, DE */ SBC16(hl_, de_), /* 0x53 LD (nn), DE */ StdInstr(Read16Inc(pc_, temp16_), Write16(temp16_, de_)),
|
||
/* 0x54 NEG */ StdInstr({MicroOp::NEG}), /* 0x55 RETN */ StdInstr(Pop(pc_), {MicroOp::RETN}),
|
||
/* 0x56 IM 1 */ StdInstr({MicroOp::IM}), /* 0x57 LD A, I */ Instr(3, {MicroOp::Move8, &ir_.bytes.high, &a_}, {MicroOp::SetAFlags}),
|
||
/* 0x40 IN B, (C); 0x41 OUT (C), B */ IN_OUT(de_.bytes.low),
|
||
/* 0x5a ADC HL, DE */ ADC16(hl_, de_), /* 0x5b LD DE, (nn) */ StdInstr(Read16Inc(pc_, temp16_), Read16(temp16_, de_)),
|
||
/* 0x5c NEG */ StdInstr({MicroOp::NEG}), /* 0x5d RETN */ StdInstr(Pop(pc_), {MicroOp::RETN}),
|
||
/* 0x5e IM 2 */ StdInstr({MicroOp::IM}), /* 0x5f LD A, R */ Instr(3, {MicroOp::Move8, &ir_.bytes.low, &a_}, {MicroOp::SetAFlags}),
|
||
/* 0x40 IN B, (C); 0x41 OUT (C), B */ IN_OUT(hl_.bytes.high),
|
||
/* 0x62 SBC HL, HL */ SBC16(hl_, hl_), /* 0x63 LD (nn), HL */ StdInstr(Read16Inc(pc_, temp16_), Write16(temp16_, hl_)),
|
||
/* 0x64 NEG */ StdInstr({MicroOp::NEG}), /* 0x65 RETN */ StdInstr(Pop(pc_), {MicroOp::RETN}),
|
||
/* 0x66 IM 0 */ StdInstr({MicroOp::IM}), /* 0x67 RRD */ StdInstr(Read3(hl_, temp8_), InternalOperation(4), {MicroOp::RRD}, Write3(hl_, temp8_)),
|
||
/* 0x40 IN B, (C); 0x41 OUT (C), B */ IN_OUT(hl_.bytes.low),
|
||
/* 0x6a ADC HL, HL */ ADC16(hl_, hl_), /* 0x6b LD HL, (nn) */ StdInstr(Read16Inc(pc_, temp16_), Read16(temp16_, hl_)),
|
||
/* 0x6c NEG */ StdInstr({MicroOp::NEG}), /* 0x6d RETN */ StdInstr(Pop(pc_), {MicroOp::RETN}),
|
||
/* 0x6e IM 0/1 */ StdInstr({MicroOp::IM}), /* 0x6f RLD */ StdInstr(Read3(hl_, temp8_), InternalOperation(4), {MicroOp::RLD}, Write3(hl_, temp8_)),
|
||
/* 0x70 IN (C) */ IN_C(temp8_), /* 0x71 OUT (C), 0 */ StdInstr({MicroOp::SetZero}, Output(bc_, temp8_)),
|
||
/* 0x72 SBC HL, SP */ SBC16(hl_, sp_), /* 0x73 LD (nn), SP */ StdInstr(Read16Inc(pc_, temp16_), Write16(temp16_, sp_)),
|
||
/* 0x74 NEG */ StdInstr({MicroOp::NEG}), /* 0x75 RETN */ StdInstr(Pop(pc_), {MicroOp::RETN}),
|
||
/* 0x76 IM 1 */ StdInstr({MicroOp::IM}), /* 0x77 XX */ NOP,
|
||
/* 0x40 IN B, (C); 0x41 OUT (C), B */ IN_OUT(a_),
|
||
/* 0x7a ADC HL, SP */ ADC16(hl_, sp_), /* 0x7b LD SP, (nn) */ StdInstr(Read16Inc(pc_, temp16_), Read16(temp16_, sp_)),
|
||
/* 0x7c NEG */ StdInstr({MicroOp::NEG}), /* 0x7d RETN */ StdInstr(Pop(pc_), {MicroOp::RETN}),
|
||
/* 0x7e IM 2 */ StdInstr({MicroOp::IM}), /* 0x7f XX */ NOP,
|
||
NOP_ROW(), /* 0x80 */
|
||
NOP_ROW(), /* 0x90 */
|
||
/* 0xa0 LDI */ StdInstr(Read3(hl_, temp8_), Write5(de_, temp8_), {MicroOp::LDI}),
|
||
/* 0xa1 CPI */ StdInstr(Read3(hl_, temp8_), InternalOperation(5), {MicroOp::CPI}),
|
||
/* 0xa2 INI */ Instr(3, Input(bc_, temp8_), Write3(hl_, temp8_), {MicroOp::INI}),
|
||
/* 0xa3 OTI */ Instr(3, Read3(hl_, temp8_), {MicroOp::OUTI}, Output(bc_, temp8_)),
|
||
NOP, NOP, NOP, NOP,
|
||
/* 0xa8 LDD */ StdInstr(Read3(hl_, temp8_), Write5(de_, temp8_), {MicroOp::LDD}),
|
||
/* 0xa9 CPD */ StdInstr(Read3(hl_, temp8_), InternalOperation(5), {MicroOp::CPD}),
|
||
/* 0xaa IND */ Instr(3, Input(bc_, temp8_), Write3(hl_, temp8_), {MicroOp::IND}),
|
||
/* 0xab OTD */ Instr(3, Read3(hl_, temp8_), {MicroOp::OUTD}, Output(bc_, temp8_)),
|
||
NOP, NOP, NOP, NOP,
|
||
/* 0xb0 LDIR */ StdInstr(Read3(hl_, temp8_), Write5(de_, temp8_), {MicroOp::LDIR}, InternalOperation(5)),
|
||
/* 0xb1 CPIR */ StdInstr(Read3(hl_, temp8_), InternalOperation(5), {MicroOp::CPIR}, InternalOperation(5)),
|
||
/* 0xb2 INIR */ Instr(3, Input(bc_, temp8_), Write3(hl_, temp8_), {MicroOp::INIR}, InternalOperation(5)),
|
||
/* 0xb3 OTIR */ Instr(3, Read3(hl_, temp8_), {MicroOp::OUTI}, Output(bc_, temp8_), {MicroOp::OUT_R}, InternalOperation(5)),
|
||
NOP, NOP, NOP, NOP,
|
||
/* 0xb8 LDDR */ StdInstr(Read3(hl_, temp8_), Write5(de_, temp8_), {MicroOp::LDDR}, InternalOperation(5)),
|
||
/* 0xb9 CPDR */ StdInstr(Read3(hl_, temp8_), InternalOperation(5), {MicroOp::CPDR}, InternalOperation(5)),
|
||
/* 0xba INDR */ Instr(3, Input(bc_, temp8_), Write3(hl_, temp8_), {MicroOp::INDR}, InternalOperation(5)),
|
||
/* 0xbb OTDR */ Instr(3, Read3(hl_, temp8_), {MicroOp::OUTD}, Output(bc_, temp8_), {MicroOp::OUT_R}, InternalOperation(5)),
|
||
NOP, NOP, NOP, NOP,
|
||
NOP_ROW(), /* 0xc0 */
|
||
NOP_ROW(), /* 0xd0 */
|
||
NOP_ROW(), /* 0xe0 */
|
||
NOP_ROW(), /* 0xf0 */
|
||
};
|
||
assemble_page(target, ed_program_table, false);
|
||
#undef NOP_ROW
|
||
}
|
||
|
||
void assemble_cb_page(InstructionPage &target, RegisterPair &index, bool add_offsets) {
|
||
#define OCTO_OP_GROUP(m, x) m(x), m(x), m(x), m(x), m(x), m(x), m(x), m(x)
|
||
#define CB_PAGE(m, p) m(RLC), m(RRC), m(RL), m(RR), m(SLA), m(SRA), m(SLL), m(SRL), OCTO_OP_GROUP(p, BIT), OCTO_OP_GROUP(m, RES), OCTO_OP_GROUP(m, SET)
|
||
|
||
InstructionTable cb_program_table = {
|
||
/* 0x00 RLC B; 0x01 RLC C; 0x02 RLC D; 0x03 RLC E; 0x04 RLC H; 0x05 RLC L; 0x06 RLC (HL); 0x07 RLC A */
|
||
/* 0x08 RRC B; 0x09 RRC C; 0x0a RRC D; 0x0b RRC E; 0x0c RRC H; 0x0d RRC L; 0x0e RRC (HL); 0x0f RRC A */
|
||
/* 0x10 RL B; 0x11 RL C; 0x12 RL D; 0x13 RL E; 0x14 RL H; 0x15 RL L; 0x16 RL (HL); 0x17 RL A */
|
||
/* 0x18 RR B; 0x99 RR C; 0x1a RR D; 0x1b RR E; 0x1c RR H; 0x1d RR L; 0x1e RR (HL); 0x1f RR A */
|
||
/* 0x20 SLA B; 0x21 SLA C; 0x22 SLA D; 0x23 SLA E; 0x24 SLA H; 0x25 SLA L; 0x26 SLA (HL); 0x27 SLA A */
|
||
/* 0x28 SRA B; 0x29 SRA C; 0x2a SRA D; 0x2b SRA E; 0x2c SRA H; 0x2d SRA L; 0x2e SRA (HL); 0x2f SRA A */
|
||
/* 0x30 SLL B; 0x31 SLL C; 0x32 SLL D; 0x33 SLL E; 0x34 SLL H; 0x35 SLL L; 0x36 SLL (HL); 0x37 SLL A */
|
||
/* 0x38 SRL B; 0x39 SRL C; 0x3a SRL D; 0x3b SRL E; 0x3c SRL H; 0x3d SRL L; 0x3e SRL (HL); 0x3f SRL A */
|
||
/* 0x40 – 0x7f: BIT */
|
||
/* 0x80 – 0xcf: RES */
|
||
/* 0xd0 – 0xdf: SET */
|
||
CB_PAGE(MODIFY_OP_GROUP, READ_OP_GROUP_D)
|
||
};
|
||
InstructionTable offsets_cb_program_table = {
|
||
CB_PAGE(IX_MODIFY_OP_GROUP, IX_READ_OP_GROUP)
|
||
};
|
||
assemble_page(target, add_offsets ? offsets_cb_program_table : cb_program_table, add_offsets);
|
||
|
||
#undef OCTO_OP_GROUP
|
||
#undef CB_PAGE
|
||
}
|
||
|
||
void assemble_base_page(InstructionPage &target, RegisterPair &index, bool add_offsets, InstructionPage &cb_page) {
|
||
#define INC_DEC_LD(r) \
|
||
StdInstr({MicroOp::Increment8, &r}), \
|
||
StdInstr({MicroOp::Decrement8, &r}), \
|
||
StdInstr(ReadInc(pc_, r))
|
||
|
||
#define INC_INC_DEC_LD(rf, r) \
|
||
Instr(4, {MicroOp::Increment16, &rf.full}), INC_DEC_LD(r)
|
||
|
||
#define DEC_INC_DEC_LD(rf, r) \
|
||
Instr(4, {MicroOp::Decrement16, &rf.full}), INC_DEC_LD(r)
|
||
|
||
InstructionTable base_program_table = {
|
||
/* 0x00 NOP */ NOP, /* 0x01 LD BC, nn */ StdInstr(Read16Inc(pc_, bc_)),
|
||
/* 0x02 LD (BC), A */ StdInstr({MicroOp::Move16, &bc_.full, &memptr_.full}, Write3(memptr_, a_)),
|
||
|
||
/* 0x03 INC BC; 0x04 INC B; 0x05 DEC B; 0x06 LD B, n */
|
||
INC_INC_DEC_LD(bc_, bc_.bytes.high),
|
||
|
||
/* 0x07 RLCA */ StdInstr({MicroOp::RLCA}),
|
||
/* 0x08 EX AF, AF' */ StdInstr({MicroOp::ExAFAFDash}), /* 0x09 ADD HL, BC */ ADD16(index, bc_),
|
||
/* 0x0a LD A, (BC) */ StdInstr({MicroOp::Move16, &bc_.full, &memptr_.full}, Read3(memptr_, a_)),
|
||
|
||
/* 0x0b DEC BC; 0x0c INC C; 0x0d DEC C; 0x0e LD C, n */
|
||
DEC_INC_DEC_LD(bc_, bc_.bytes.low),
|
||
|
||
/* 0x0f RRCA */ StdInstr({MicroOp::RRCA}),
|
||
/* 0x10 DJNZ */ Instr(3, ReadInc(pc_, temp8_), {MicroOp::DJNZ}, InternalOperation(5), {MicroOp::CalculateIndexAddress, &pc_.full}, {MicroOp::Move16, &memptr_.full, &pc_.full}),
|
||
/* 0x11 LD DE, nn */ StdInstr(Read16Inc(pc_, de_)),
|
||
/* 0x12 LD (DE), A */ StdInstr({MicroOp::Move16, &de_.full, &memptr_.full}, Write3(memptr_, a_)),
|
||
|
||
/* 0x13 INC DE; 0x14 INC D; 0x15 DEC D; 0x16 LD D, n */
|
||
INC_INC_DEC_LD(de_, de_.bytes.high),
|
||
|
||
/* 0x17 RLA */ StdInstr({MicroOp::RLA}),
|
||
/* 0x18 JR */ StdInstr(ReadInc(pc_, temp8_), InternalOperation(5), {MicroOp::CalculateIndexAddress, &pc_.full}, {MicroOp::Move16, &memptr_.full, &pc_.full}),
|
||
/* 0x19 ADD HL, DE */ ADD16(index, de_),
|
||
/* 0x1a LD A, (DE) */ StdInstr({MicroOp::Move16, &de_.full, &memptr_.full}, Read3(memptr_, a_)),
|
||
|
||
/* 0x1b DEC DE; 0x1c INC E; 0x1d DEC E; 0x1e LD E, n */
|
||
DEC_INC_DEC_LD(de_, de_.bytes.low),
|
||
|
||
/* 0x1f RRA */ StdInstr({MicroOp::RRA}),
|
||
/* 0x20 JR NZ */ JR(TestNZ), /* 0x21 LD HL, nn */ StdInstr(Read16Inc(pc_, index)),
|
||
/* 0x22 LD (nn), HL */ StdInstr(Read16Inc(pc_, temp16_), Write16(temp16_, index)),
|
||
|
||
/* 0x23 INC HL; 0x24 INC H; 0x25 DEC H; 0x26 LD H, n */
|
||
INC_INC_DEC_LD(index, index.bytes.high),
|
||
|
||
/* 0x27 DAA */ StdInstr({MicroOp::DAA}),
|
||
/* 0x28 JR Z */ JR(TestZ), /* 0x29 ADD HL, HL */ ADD16(index, index),
|
||
/* 0x2a LD HL, (nn) */ StdInstr(Read16Inc(pc_, temp16_), Read16(temp16_, index)),
|
||
|
||
/* 0x2b DEC HL; 0x2c INC L; 0x2d DEC L; 0x2e LD L, n */
|
||
DEC_INC_DEC_LD(index, index.bytes.low),
|
||
|
||
/* 0x2f CPL */ StdInstr({MicroOp::CPL}),
|
||
/* 0x30 JR NC */ JR(TestNC), /* 0x31 LD SP, nn */ StdInstr(Read16Inc(pc_, sp_)),
|
||
/* 0x32 LD (nn), A */ StdInstr(Read16Inc(pc_, temp16_), Write3(temp16_, a_)),
|
||
/* 0x33 INC SP */ Instr(4, {MicroOp::Increment16, &sp_.full}),
|
||
/* 0x34 INC (HL) */ StdInstr(INDEX(), Read4(INDEX_ADDR(), temp8_), {MicroOp::Increment8, &temp8_}, Write3(INDEX_ADDR(), temp8_)),
|
||
/* 0x35 DEC (HL) */ StdInstr(INDEX(), Read4(INDEX_ADDR(), temp8_), {MicroOp::Decrement8, &temp8_}, Write3(INDEX_ADDR(), temp8_)),
|
||
/* 0x36 LD (HL), n */ StdInstr(ReadInc(pc_, temp8_), Write3(INDEX_ADDR(), temp8_)),
|
||
/* 0x37 SCF */ StdInstr({MicroOp::SCF}),
|
||
/* 0x38 JR C */ JR(TestC),
|
||
/* 0x39 ADD HL, SP */ ADD16(index, sp_),
|
||
/* 0x3a LD A, (nn) */ StdInstr(Read16Inc(pc_, memptr_), Read3(memptr_, a_)),
|
||
/* 0x3b DEC SP */ Instr(4, {MicroOp::Decrement16, &sp_.full}),
|
||
|
||
/* 0x3c INC A; 0x3d DEC A; 0x3e LD A, n */
|
||
INC_DEC_LD(a_),
|
||
|
||
/* 0x3f CCF */ StdInstr({MicroOp::CCF}),
|
||
|
||
/* 0x40 LD B, B; 0x41 LD B, C; 0x42 LD B, D; 0x43 LD B, E; 0x44 LD B, H; 0x45 LD B, L; 0x46 LD B, (HL); 0x47 LD B, A */
|
||
LD_GROUP(bc_.bytes.high, bc_.bytes.high),
|
||
|
||
/* 0x48 LD C, B; 0x49 LD C, C; 0x4a LD C, D; 0x4b LD C, E; 0x4c LD C, H; 0x4d LD C, L; 0x4e LD C, (HL); 0x4f LD C, A */
|
||
LD_GROUP(bc_.bytes.low, bc_.bytes.low),
|
||
|
||
/* 0x50 LD D, B; 0x51 LD D, C; 0x52 LD D, D; 0x53 LD D, E; 0x54 LD D, H; 0x55 LD D, L; 0x56 LD D, (HL); 0x57 LD D, A */
|
||
LD_GROUP(de_.bytes.high, de_.bytes.high),
|
||
|
||
/* 0x58 LD E, B; 0x59 LD E, C; 0x5a LD E, D; 0x5b LD E, E; 0x5c LD E, H; 0x5d LD E, L; 0x5e LD E, (HL); 0x5f LD E, A */
|
||
LD_GROUP(de_.bytes.low, de_.bytes.low),
|
||
|
||
/* 0x60 LD H, B; 0x61 LD H, C; 0x62 LD H, D; 0x63 LD H, E; 0x64 LD H, H; 0x65 LD H, L; 0x66 LD H, (HL); 0x67 LD H, A */
|
||
LD_GROUP(index.bytes.high, hl_.bytes.high),
|
||
|
||
/* 0x68 LD L, B; 0x69 LD L, C; 0x6a LD L, D; 0x6b LD L, E; 0x6c LD L, H; 0x6d LD H, L; 0x6e LD L, (HL); 0x6f LD L, A */
|
||
LD_GROUP(index.bytes.low, hl_.bytes.low),
|
||
|
||
/* 0x70 LD (HL), B */ StdInstr(INDEX(), Write3(INDEX_ADDR(), bc_.bytes.high)),
|
||
/* 0x71 LD (HL), C */ StdInstr(INDEX(), Write3(INDEX_ADDR(), bc_.bytes.low)),
|
||
/* 0x72 LD (HL), D */ StdInstr(INDEX(), Write3(INDEX_ADDR(), de_.bytes.high)),
|
||
/* 0x73 LD (HL), E */ StdInstr(INDEX(), Write3(INDEX_ADDR(), de_.bytes.low)),
|
||
/* 0x74 LD (HL), H */ StdInstr(INDEX(), Write3(INDEX_ADDR(), hl_.bytes.high)), // neither of these stores parts of the index register;
|
||
/* 0x75 LD (HL), L */ StdInstr(INDEX(), Write3(INDEX_ADDR(), hl_.bytes.low)), // they always store exactly H and L.
|
||
/* 0x76 HALT */ StdInstr({MicroOp::HALT}),
|
||
/* 0x77 LD (HL), A */ StdInstr(INDEX(), Write3(INDEX_ADDR(), a_)),
|
||
|
||
/* 0x78 LD A, B; 0x79 LD A, C; 0x7a LD A, D; 0x7b LD A, E; 0x7c LD A, H; 0x7d LD A, L; 0x7e LD A, (HL); 0x7f LD A, A */
|
||
LD_GROUP(a_, a_),
|
||
|
||
/* 0x80 ADD B; 0x81 ADD C; 0x82 ADD D; 0x83 ADD E; 0x84 ADD H; 0x85 ADD L; 0x86 ADD (HL); 0x87 ADD A */
|
||
READ_OP_GROUP(ADD8),
|
||
|
||
/* 0x88 ADC B; 0x89 ADC C; 0x8a ADC D; 0x8b ADC E; 0x8c ADC H; 0x8d ADC L; 0x8e ADC (HL); 0x8f ADC A */
|
||
READ_OP_GROUP(ADC8),
|
||
|
||
/* 0x90 SUB B; 0x91 SUB C; 0x92 SUB D; 0x93 SUB E; 0x94 SUB H; 0x95 SUB L; 0x96 SUB (HL); 0x97 SUB A */
|
||
READ_OP_GROUP(SUB8),
|
||
|
||
/* 0x98 SBC B; 0x99 SBC C; 0x9a SBC D; 0x9b SBC E; 0x9c SBC H; 0x9d SBC L; 0x9e SBC (HL); 0x9f SBC A */
|
||
READ_OP_GROUP(SBC8),
|
||
|
||
/* 0xa0 AND B; 0xa1 AND C; 0xa2 AND D; 0xa3 AND E; 0xa4 AND H; 0xa5 AND L; 0xa6 AND (HL); 0xa7 AND A */
|
||
READ_OP_GROUP(And),
|
||
|
||
/* 0xa8 XOR B; 0xa9 XOR C; 0xaa XOR D; 0xab XOR E; 0xac XOR H; 0xad XOR L; 0xae XOR (HL); 0xaf XOR A */
|
||
READ_OP_GROUP(Xor),
|
||
|
||
/* 0xb0 OR B; 0xb1 OR C; 0xb2 OR D; 0xb3 OR E; 0xb4 OR H; 0xb5 OR L; 0xb6 OR (HL); 0xb7 OR A */
|
||
READ_OP_GROUP(Or),
|
||
|
||
/* 0xb8 CP B; 0xb9 CP C; 0xba CP D; 0xbb CP E; 0xbc CP H; 0xbd CP L; 0xbe CP (HL); 0xbf CP A */
|
||
READ_OP_GROUP(CP8),
|
||
|
||
/* 0xc0 RET NZ */ RET(TestNZ), /* 0xc1 POP BC */ StdInstr(Pop(bc_)),
|
||
/* 0xc2 JP NZ */ JP(TestNZ), /* 0xc3 JP nn */ StdInstr(Read16(pc_, temp16_), {MicroOp::Move16, &temp16_.full, &pc_.full}),
|
||
/* 0xc4 CALL NZ */ CALL(TestNZ), /* 0xc5 PUSH BC */ Instr(3, Push(bc_)),
|
||
/* 0xc6 ADD A, n */ StdInstr(ReadInc(pc_, temp8_), {MicroOp::ADD8, &temp8_}),
|
||
/* 0xc7 RST 00h */ RST(),
|
||
/* 0xc8 RET Z */ RET(TestZ), /* 0xc9 RET */ StdInstr(Pop(pc_)),
|
||
/* 0xca JP Z */ JP(TestZ), /* 0xcb [CB page] */StdInstr(FINDEX(), {MicroOp::SetInstructionPage, &cb_page}),
|
||
/* 0xcc CALL Z */ CALL(TestZ), /* 0xcd CALL */ StdInstr(ReadInc(pc_, temp16_.bytes.low), Read4Inc(pc_, temp16_.bytes.high), Push(pc_), {MicroOp::Move16, &temp16_.full, &pc_.full}),
|
||
/* 0xce ADC A, n */ StdInstr(ReadInc(pc_, temp8_), {MicroOp::ADC8, &temp8_}),
|
||
/* 0xcf RST 08h */ RST(),
|
||
/* 0xd0 RET NC */ RET(TestNC), /* 0xd1 POP DE */ StdInstr(Pop(de_)),
|
||
/* 0xd2 JP NC */ JP(TestNC), /* 0xd3 OUT (n), A */StdInstr(ReadInc(pc_, temp16_.bytes.low), {MicroOp::Move8, &a_, &temp16_.bytes.high}, Output(temp16_, a_)),
|
||
/* 0xd4 CALL NC */ CALL(TestNC), /* 0xd5 PUSH DE */ Instr(3, Push(de_)),
|
||
/* 0xd6 SUB n */ StdInstr(ReadInc(pc_, temp8_), {MicroOp::SUB8, &temp8_}),
|
||
/* 0xd7 RST 10h */ RST(),
|
||
/* 0xd8 RET C */ RET(TestC), /* 0xd9 EXX */ StdInstr({MicroOp::EXX}),
|
||
/* 0xda JP C */ JP(TestC), /* 0xdb IN A, (n) */StdInstr(ReadInc(pc_, temp16_.bytes.low), {MicroOp::Move8, &a_, &temp16_.bytes.high}, Input(temp16_, a_)),
|
||
/* 0xdc CALL C */ CALL(TestC), /* 0xdd [DD page] */StdInstr({MicroOp::SetInstructionPage, &dd_page_}),
|
||
/* 0xde SBC A, n */ StdInstr(ReadInc(pc_, temp8_), {MicroOp::SBC8, &temp8_}),
|
||
/* 0xdf RST 18h */ RST(),
|
||
/* 0xe0 RET PO */ RET(TestPO), /* 0xe1 POP HL */ StdInstr(Pop(index)),
|
||
/* 0xe2 JP PO */ JP(TestPO), /* 0xe3 EX (SP), HL */StdInstr(Pop7(memptr_), Push8(index), {MicroOp::Move16, &memptr_.full, &index.full}),
|
||
/* 0xe4 CALL PO */ CALL(TestPO), /* 0xe5 PUSH HL */ Instr(3, Push(index)),
|
||
/* 0xe6 AND n */ StdInstr(ReadInc(pc_, temp8_), {MicroOp::And, &temp8_}),
|
||
/* 0xe7 RST 20h */ RST(),
|
||
/* 0xe8 RET PE */ RET(TestPE), /* 0xe9 JP (HL) */ StdInstr({MicroOp::Move16, &index.full, &pc_.full}),
|
||
/* 0xea JP PE */ JP(TestPE), /* 0xeb EX DE, HL */StdInstr({MicroOp::ExDEHL}),
|
||
/* 0xec CALL PE */ CALL(TestPE), /* 0xed [ED page] */StdInstr({MicroOp::SetInstructionPage, &ed_page_}),
|
||
/* 0xee XOR n */ StdInstr(ReadInc(pc_, temp8_), {MicroOp::Xor, &temp8_}),
|
||
/* 0xef RST 28h */ RST(),
|
||
/* 0xf0 RET p */ RET(TestP), /* 0xf1 POP AF */ StdInstr(Pop(temp16_), {MicroOp::DisassembleAF}),
|
||
/* 0xf2 JP P */ JP(TestP), /* 0xf3 DI */ StdInstr({MicroOp::DI}),
|
||
/* 0xf4 CALL P */ CALL(TestP), /* 0xf5 PUSH AF */ Instr(3, {MicroOp::AssembleAF}, Push(temp16_)),
|
||
/* 0xf6 OR n */ StdInstr(ReadInc(pc_, temp8_), {MicroOp::Or, &temp8_}),
|
||
/* 0xf7 RST 30h */ RST(),
|
||
/* 0xf8 RET M */ RET(TestM), /* 0xf9 LD SP, HL */Instr(4, {MicroOp::Move16, &index.full, &sp_.full}),
|
||
/* 0xfa JP M */ JP(TestM), /* 0xfb EI */ StdInstr({MicroOp::EI}),
|
||
/* 0xfc CALL M */ CALL(TestM), /* 0xfd [FD page] */StdInstr({MicroOp::SetInstructionPage, &fd_page_}),
|
||
/* 0xfe CP n */ StdInstr(ReadInc(pc_, temp8_), {MicroOp::CP8, &temp8_}),
|
||
/* 0xff RST 38h */ RST(),
|
||
};
|
||
|
||
if(add_offsets) {
|
||
// The indexed version of 0x36 differs substantially from the non-indexed by building index calculation into
|
||
// the cycle that fetches the final operand. So patch in a different microprogram if building an indexed table.
|
||
InstructionTable copy_table = {
|
||
StdInstr(FINDEX(), Read5Inc(pc_, temp8_), Write3(INDEX_ADDR(), temp8_))
|
||
};
|
||
memcpy(&base_program_table[0x36], ©_table[0], sizeof(copy_table[0]));
|
||
}
|
||
|
||
assemble_cb_page(cb_page, index, add_offsets);
|
||
assemble_page(target, base_program_table, add_offsets);
|
||
}
|
||
|
||
void assemble_fetch_decode_execute(InstructionPage &target, int length) {
|
||
const MicroOp normal_fetch_decode_execute[] = {
|
||
BusOp(ReadOpcodeStart()),
|
||
BusOp(ReadOpcodeWait(1, true)),
|
||
{ MicroOp::DecodeOperation }
|
||
};
|
||
const MicroOp short_fetch_decode_execute[] = {
|
||
BusOp(ReadOpcodeStart()),
|
||
BusOp(ReadOpcodeWait(1, false)),
|
||
BusOp(ReadOpcodeWait(1, true)),
|
||
{ MicroOp::DecodeOperation }
|
||
};
|
||
copy_program((length == 4) ? normal_fetch_decode_execute : short_fetch_decode_execute, target.fetch_decode_execute);
|
||
target.fetch_decode_execute_data = target.fetch_decode_execute.data();
|
||
}
|
||
|
||
void copy_program(const MicroOp *source, std::vector<MicroOp> &destination) {
|
||
size_t length = 0;
|
||
while(!isTerminal(source[length].type)) length++;
|
||
destination.resize(length + 1);
|
||
size_t pointer = 0;
|
||
while(true) {
|
||
destination[pointer] = source[pointer];
|
||
if(isTerminal(source[pointer].type)) break;
|
||
pointer++;
|
||
}
|
||
}
|
||
|
||
public:
|
||
Processor() :
|
||
halt_mask_(0xff),
|
||
number_of_cycles_(0),
|
||
interrupt_mode_(0),
|
||
wait_line_(false),
|
||
request_status_(Interrupt::PowerOn),
|
||
last_request_status_(Interrupt::PowerOn),
|
||
irq_line_(false),
|
||
nmi_line_(false),
|
||
bus_request_line_(false),
|
||
pc_increment_(1),
|
||
scheduled_program_counter_(nullptr) {
|
||
set_flags(0xff);
|
||
|
||
MicroOp conditional_call_untaken_program[] = Sequence(ReadInc(pc_, temp16_.bytes.high));
|
||
copy_program(conditional_call_untaken_program, conditional_call_untaken_program_);
|
||
|
||
assemble_base_page(base_page_, hl_, false, cb_page_);
|
||
assemble_base_page(dd_page_, ix_, true, ddcb_page_);
|
||
assemble_base_page(fd_page_, iy_, true, fdcb_page_);
|
||
assemble_ed_page(ed_page_);
|
||
|
||
fdcb_page_.r_step = 0;
|
||
fd_page_.is_indexed = true;
|
||
fdcb_page_.is_indexed = true;
|
||
|
||
ddcb_page_.r_step = 0;
|
||
dd_page_.is_indexed = true;
|
||
ddcb_page_.is_indexed = true;
|
||
|
||
assemble_fetch_decode_execute(base_page_, 4);
|
||
assemble_fetch_decode_execute(dd_page_, 4);
|
||
assemble_fetch_decode_execute(fd_page_, 4);
|
||
assemble_fetch_decode_execute(ed_page_, 4);
|
||
assemble_fetch_decode_execute(cb_page_, 4);
|
||
|
||
assemble_fetch_decode_execute(fdcb_page_, 3);
|
||
assemble_fetch_decode_execute(ddcb_page_, 3);
|
||
|
||
MicroOp reset_program[] = Sequence(InternalOperation(3), {MicroOp::Reset});
|
||
|
||
// Justification for NMI timing: per Wilf Rigter on the ZX81 (http://www.user.dccnet.com/wrigter/index_files/ZX81WAIT.htm),
|
||
// wait cycles occur between T2 and T3 during NMI; extending the refresh cycle is also consistent with my guess
|
||
// for the action of other non-four-cycle opcode fetches
|
||
MicroOp nmi_program[] = {
|
||
{ MicroOp::BeginNMI },
|
||
BusOp(ReadOpcodeStart()),
|
||
BusOp(ReadOpcodeWait(1, true)),
|
||
BusOp(Refresh(3)),
|
||
Push(pc_),
|
||
{ MicroOp::JumpTo66, nullptr, nullptr},
|
||
{ MicroOp::MoveToNextProgram }
|
||
};
|
||
MicroOp irq_mode0_program[] = {
|
||
{ MicroOp::BeginIRQMode0 },
|
||
BusOp(IntAck(4, operation_)),
|
||
BusOp(IntWait(operation_)),
|
||
{ MicroOp::DecodeOperationNoRChange }
|
||
};
|
||
MicroOp irq_mode1_program[] = {
|
||
{ MicroOp::BeginIRQ },
|
||
BusOp(IntAck(5, operation_)),
|
||
BusOp(IntWait(operation_)),
|
||
BusOp(Refresh(2)),
|
||
Push(pc_),
|
||
{ MicroOp::Move16, &temp16_.full, &pc_.full },
|
||
{ MicroOp::MoveToNextProgram }
|
||
};
|
||
MicroOp irq_mode2_program[] = {
|
||
{ MicroOp::BeginIRQ },
|
||
BusOp(IntAck(5, temp16_.bytes.low)),
|
||
BusOp(IntWait(temp16_.bytes.low)),
|
||
BusOp(Refresh(2)),
|
||
Push(pc_),
|
||
{ MicroOp::Move8, &ir_.bytes.high, &temp16_.bytes.high },
|
||
Read16(temp16_, pc_),
|
||
{ MicroOp::MoveToNextProgram }
|
||
};
|
||
|
||
copy_program(reset_program, reset_program_);
|
||
copy_program(nmi_program, nmi_program_);
|
||
copy_program(irq_mode0_program, irq_program_[0]);
|
||
copy_program(irq_mode1_program, irq_program_[1]);
|
||
copy_program(irq_mode2_program, irq_program_[2]);
|
||
}
|
||
|
||
/*!
|
||
Runs the Z80 for a supplied number of cycles.
|
||
|
||
@discussion Subclasses must implement @c perform_machine_cycle(const PartialMachineCycle &cycle) .
|
||
|
||
If it is a read operation then @c value will be seeded with the value 0xff.
|
||
|
||
@param number_of_cycles The number of cycles to run the Z80 for.
|
||
*/
|
||
void run_for_cycles(int number_of_cycles) {
|
||
|
||
#define advance_operation() \
|
||
pc_increment_ = 1; \
|
||
if(last_request_status_) { \
|
||
halt_mask_ = 0xff; \
|
||
if(last_request_status_ & (Interrupt::PowerOn | Interrupt::Reset)) { \
|
||
request_status_ &= ~Interrupt::PowerOn; \
|
||
scheduled_program_counter_ = reset_program_.data(); \
|
||
} else if(last_request_status_ & Interrupt::NMI) { \
|
||
request_status_ &= ~Interrupt::NMI; \
|
||
scheduled_program_counter_ = nmi_program_.data(); \
|
||
} else if(last_request_status_ & Interrupt::IRQ) { \
|
||
scheduled_program_counter_ = irq_program_[interrupt_mode_].data(); \
|
||
} \
|
||
} else { \
|
||
current_instruction_page_ = &base_page_; \
|
||
scheduled_program_counter_ = base_page_.fetch_decode_execute_data; \
|
||
}
|
||
|
||
number_of_cycles_ += number_of_cycles;
|
||
if(!scheduled_program_counter_) {
|
||
advance_operation();
|
||
}
|
||
|
||
while(1) {
|
||
|
||
while(bus_request_line_) {
|
||
static PartialMachineCycle bus_acknowledge_cycle = {PartialMachineCycle::BusAcknowledge, 1, nullptr, nullptr, false};
|
||
number_of_cycles_ -= static_cast<T *>(this)->perform_machine_cycle(bus_acknowledge_cycle) + 1;
|
||
if(!number_of_cycles_) {
|
||
static_cast<T *>(this)->flush();
|
||
return;
|
||
}
|
||
}
|
||
|
||
while(!bus_request_line_) {
|
||
const MicroOp *operation = scheduled_program_counter_;
|
||
scheduled_program_counter_++;
|
||
|
||
#define set_parity(v) \
|
||
parity_overflow_result_ = (uint8_t)(v^1);\
|
||
parity_overflow_result_ ^= parity_overflow_result_ >> 4;\
|
||
parity_overflow_result_ ^= parity_overflow_result_ << 2;\
|
||
parity_overflow_result_ ^= parity_overflow_result_ >> 1;
|
||
|
||
switch(operation->type) {
|
||
case MicroOp::BusOperation:
|
||
if(number_of_cycles_ < operation->machine_cycle.length) {
|
||
scheduled_program_counter_--;
|
||
static_cast<T *>(this)->flush();
|
||
return;
|
||
}
|
||
if(operation->machine_cycle.was_requested) {
|
||
if(wait_line_) {
|
||
scheduled_program_counter_--;
|
||
} else {
|
||
continue;
|
||
}
|
||
}
|
||
number_of_cycles_ -= operation->machine_cycle.length;
|
||
last_request_status_ = request_status_;
|
||
number_of_cycles_ -= static_cast<T *>(this)->perform_machine_cycle(operation->machine_cycle);
|
||
break;
|
||
case MicroOp::MoveToNextProgram:
|
||
advance_operation();
|
||
break;
|
||
case MicroOp::DecodeOperation:
|
||
refresh_addr_ = ir_;
|
||
ir_.bytes.low = (ir_.bytes.low & 0x80) | ((ir_.bytes.low + current_instruction_page_->r_step) & 0x7f);
|
||
pc_.full += pc_increment_ & (uint16_t)halt_mask_;
|
||
scheduled_program_counter_ = current_instruction_page_->instructions[operation_ & halt_mask_];
|
||
break;
|
||
case MicroOp::DecodeOperationNoRChange:
|
||
refresh_addr_ = ir_;
|
||
pc_.full += pc_increment_ & (uint16_t)halt_mask_;
|
||
scheduled_program_counter_ = current_instruction_page_->instructions[operation_ & halt_mask_];
|
||
break;
|
||
|
||
case MicroOp::Increment16: (*(uint16_t *)operation->source)++; break;
|
||
case MicroOp::IncrementPC: pc_.full += pc_increment_; break;
|
||
case MicroOp::Decrement16: (*(uint16_t *)operation->source)--; break;
|
||
case MicroOp::Move8: *(uint8_t *)operation->destination = *(uint8_t *)operation->source; break;
|
||
case MicroOp::Move16: *(uint16_t *)operation->destination = *(uint16_t *)operation->source; break;
|
||
|
||
case MicroOp::AssembleAF:
|
||
temp16_.bytes.high = a_;
|
||
temp16_.bytes.low = get_flags();
|
||
break;
|
||
case MicroOp::DisassembleAF:
|
||
a_ = temp16_.bytes.high;
|
||
set_flags(temp16_.bytes.low);
|
||
break;
|
||
|
||
#pragma mark - Logical
|
||
|
||
#define set_logical_flags(hf) \
|
||
sign_result_ = zero_result_ = bit53_result_ = a_; \
|
||
set_parity(a_); \
|
||
half_carry_result_ = hf; \
|
||
subtract_flag_ = 0; \
|
||
carry_result_ = 0;
|
||
|
||
case MicroOp::And:
|
||
a_ &= *(uint8_t *)operation->source;
|
||
set_logical_flags(Flag::HalfCarry);
|
||
break;
|
||
|
||
case MicroOp::Or:
|
||
a_ |= *(uint8_t *)operation->source;
|
||
set_logical_flags(0);
|
||
break;
|
||
|
||
case MicroOp::Xor:
|
||
a_ ^= *(uint8_t *)operation->source;
|
||
set_logical_flags(0);
|
||
break;
|
||
|
||
#undef set_logical_flags
|
||
|
||
case MicroOp::CPL:
|
||
a_ ^= 0xff;
|
||
subtract_flag_ = Flag::Subtract;
|
||
half_carry_result_ = Flag::HalfCarry;
|
||
bit53_result_ = a_;
|
||
break;
|
||
|
||
case MicroOp::CCF:
|
||
half_carry_result_ = (uint8_t)(carry_result_ << 4);
|
||
carry_result_ ^= Flag::Carry;
|
||
subtract_flag_ = 0;
|
||
bit53_result_ = a_;
|
||
break;
|
||
|
||
case MicroOp::SCF:
|
||
carry_result_ = Flag::Carry;
|
||
half_carry_result_ = 0;
|
||
subtract_flag_ = 0;
|
||
bit53_result_ = a_;
|
||
break;
|
||
|
||
#pragma mark - Flow control
|
||
|
||
case MicroOp::DJNZ:
|
||
bc_.bytes.high--;
|
||
if(!bc_.bytes.high) {
|
||
advance_operation();
|
||
}
|
||
break;
|
||
|
||
case MicroOp::CalculateRSTDestination:
|
||
memptr_.full = operation_ & 0x38;
|
||
break;
|
||
|
||
#pragma mark - 8-bit arithmetic
|
||
|
||
#define set_arithmetic_flags(sub, b53) \
|
||
sign_result_ = zero_result_ = (uint8_t)result; \
|
||
carry_result_ = (uint8_t)(result >> 8); \
|
||
half_carry_result_ = (uint8_t)half_result; \
|
||
parity_overflow_result_ = (uint8_t)(overflow >> 5); \
|
||
subtract_flag_ = sub; \
|
||
bit53_result_ = (uint8_t)b53;
|
||
|
||
case MicroOp::CP8: {
|
||
uint8_t value = *(uint8_t *)operation->source;
|
||
int result = a_ - value;
|
||
int half_result = (a_&0xf) - (value&0xf);
|
||
|
||
// overflow for a subtraction is when the signs were originally
|
||
// different and the result is different again
|
||
int overflow = (value^a_) & (result^a_);
|
||
|
||
// the 5 and 3 flags come from the operand, atypically
|
||
set_arithmetic_flags(Flag::Subtract, value);
|
||
} break;
|
||
|
||
case MicroOp::SUB8: {
|
||
uint8_t value = *(uint8_t *)operation->source;
|
||
int result = a_ - value;
|
||
int half_result = (a_&0xf) - (value&0xf);
|
||
|
||
// overflow for a subtraction is when the signs were originally
|
||
// different and the result is different again
|
||
int overflow = (value^a_) & (result^a_);
|
||
|
||
a_ = (uint8_t)result;
|
||
set_arithmetic_flags(Flag::Subtract, result);
|
||
} break;
|
||
|
||
case MicroOp::SBC8: {
|
||
uint8_t value = *(uint8_t *)operation->source;
|
||
int result = a_ - value - (carry_result_ & Flag::Carry);
|
||
int half_result = (a_&0xf) - (value&0xf) - (carry_result_ & Flag::Carry);
|
||
|
||
// overflow for a subtraction is when the signs were originally
|
||
// different and the result is different again
|
||
int overflow = (value^a_) & (result^a_);
|
||
|
||
a_ = (uint8_t)result;
|
||
set_arithmetic_flags(Flag::Subtract, result);
|
||
} break;
|
||
|
||
case MicroOp::ADD8: {
|
||
uint8_t value = *(uint8_t *)operation->source;
|
||
int result = a_ + value;
|
||
int half_result = (a_&0xf) + (value&0xf);
|
||
|
||
// overflow for addition is when the signs were originally
|
||
// the same and the result is different
|
||
int overflow = ~(value^a_) & (result^a_);
|
||
|
||
a_ = (uint8_t)result;
|
||
set_arithmetic_flags(0, result);
|
||
} break;
|
||
|
||
case MicroOp::ADC8: {
|
||
uint8_t value = *(uint8_t *)operation->source;
|
||
int result = a_ + value + (carry_result_ & Flag::Carry);
|
||
int half_result = (a_&0xf) + (value&0xf) + (carry_result_ & Flag::Carry);
|
||
|
||
// overflow for addition is when the signs were originally
|
||
// the same and the result is different
|
||
int overflow = ~(value^a_) & (result^a_);
|
||
|
||
a_ = (uint8_t)result;
|
||
set_arithmetic_flags(0, result);
|
||
} break;
|
||
|
||
#undef set_arithmetic_flags
|
||
|
||
case MicroOp::NEG: {
|
||
int overflow = (a_ == 0x80);
|
||
int result = -a_;
|
||
int halfResult = -(a_&0xf);
|
||
|
||
a_ = (uint8_t)result;
|
||
bit53_result_ = sign_result_ = zero_result_ = a_;
|
||
parity_overflow_result_ = overflow ? Flag::Overflow : 0;
|
||
subtract_flag_ = Flag::Subtract;
|
||
carry_result_ = (uint8_t)(result >> 8);
|
||
half_carry_result_ = (uint8_t)halfResult;
|
||
} break;
|
||
|
||
case MicroOp::Increment8: {
|
||
uint8_t value = *(uint8_t *)operation->source;
|
||
int result = value + 1;
|
||
|
||
// with an increment, overflow occurs if the sign changes from
|
||
// positive to negative
|
||
int overflow = (value ^ result) & ~value;
|
||
int half_result = (value&0xf) + 1;
|
||
|
||
*(uint8_t *)operation->source = (uint8_t)result;
|
||
|
||
// sign, zero and 5 & 3 are set directly from the result
|
||
bit53_result_ = sign_result_ = zero_result_ = (uint8_t)result;
|
||
half_carry_result_ = (uint8_t)half_result;
|
||
parity_overflow_result_ = (uint8_t)(overflow >> 5);
|
||
subtract_flag_ = 0;
|
||
} break;
|
||
|
||
case MicroOp::Decrement8: {
|
||
uint8_t value = *(uint8_t *)operation->source;
|
||
int result = value - 1;
|
||
|
||
// with a decrement, overflow occurs if the sign changes from
|
||
// negative to positive
|
||
int overflow = (value ^ result) & value;
|
||
int half_result = (value&0xf) - 1;
|
||
|
||
*(uint8_t *)operation->source = (uint8_t)result;
|
||
|
||
// sign, zero and 5 & 3 are set directly from the result
|
||
bit53_result_ = sign_result_ = zero_result_ = (uint8_t)result;
|
||
half_carry_result_ = (uint8_t)half_result;
|
||
parity_overflow_result_ = (uint8_t)(overflow >> 5);
|
||
subtract_flag_ = Flag::Subtract;
|
||
} break;
|
||
|
||
case MicroOp::DAA: {
|
||
int lowNibble = a_ & 0xf;
|
||
int highNibble = a_ >> 4;
|
||
int amountToAdd = 0;
|
||
|
||
if(carry_result_ & Flag::Carry)
|
||
{
|
||
amountToAdd = (lowNibble > 0x9 || (half_carry_result_ & Flag::HalfCarry)) ? 0x66 : 0x60;
|
||
}
|
||
else
|
||
{
|
||
if(half_carry_result_ & Flag::HalfCarry)
|
||
{
|
||
if(lowNibble > 0x9)
|
||
amountToAdd = (highNibble > 0x8) ? 0x66 : 0x06;
|
||
else
|
||
amountToAdd = (highNibble > 0x9) ? 0x66 : 0x06;
|
||
}
|
||
else
|
||
{
|
||
if(lowNibble > 0x9)
|
||
amountToAdd = (highNibble > 0x8) ? 0x66 : 0x06;
|
||
else
|
||
amountToAdd = (highNibble > 0x9) ? 0x60 : 0x00;
|
||
}
|
||
}
|
||
|
||
if(!(carry_result_ & Flag::Carry))
|
||
{
|
||
if(lowNibble > 0x9)
|
||
{
|
||
if(highNibble > 0x8) carry_result_ = Flag::Carry;
|
||
}
|
||
else
|
||
{
|
||
if(highNibble > 0x9) carry_result_ = Flag::Carry;
|
||
}
|
||
}
|
||
|
||
if(subtract_flag_)
|
||
{
|
||
a_ -= amountToAdd;
|
||
half_carry_result_ = ((half_carry_result_ & Flag::HalfCarry) && lowNibble < 0x6) ? Flag::HalfCarry : 0;
|
||
}
|
||
else
|
||
{
|
||
a_ += amountToAdd;
|
||
half_carry_result_ = (lowNibble > 0x9) ? Flag::HalfCarry : 0;
|
||
}
|
||
|
||
sign_result_ = zero_result_ = bit53_result_ = a_;
|
||
|
||
set_parity(a_);
|
||
} break;
|
||
|
||
#pragma mark - 16-bit arithmetic
|
||
|
||
case MicroOp::ADD16: {
|
||
memptr_.full = *(uint16_t *)operation->source;
|
||
uint16_t sourceValue = memptr_.full;
|
||
uint16_t destinationValue = *(uint16_t *)operation->destination;
|
||
int result = sourceValue + destinationValue;
|
||
int halfResult = (sourceValue&0xfff) + (destinationValue&0xfff);
|
||
|
||
bit53_result_ = (uint8_t)(result >> 8);
|
||
carry_result_ = (uint8_t)(result >> 16);
|
||
half_carry_result_ = (uint8_t)(halfResult >> 8);
|
||
subtract_flag_ = 0;
|
||
|
||
*(uint16_t *)operation->destination = (uint16_t)result;
|
||
} break;
|
||
|
||
case MicroOp::ADC16: {
|
||
memptr_.full = *(uint16_t *)operation->source;
|
||
uint16_t sourceValue = memptr_.full;
|
||
uint16_t destinationValue = *(uint16_t *)operation->destination;
|
||
int result = sourceValue + destinationValue + (carry_result_ & Flag::Carry);
|
||
int halfResult = (sourceValue&0xfff) + (destinationValue&0xfff) + (carry_result_ & Flag::Carry);
|
||
|
||
int overflow = (result ^ destinationValue) & ~(destinationValue ^ sourceValue);
|
||
|
||
bit53_result_ =
|
||
sign_result_ = (uint8_t)(result >> 8);
|
||
zero_result_ = (uint8_t)(result | sign_result_);
|
||
subtract_flag_ = 0;
|
||
carry_result_ = (uint8_t)(result >> 16);
|
||
half_carry_result_ = (uint8_t)(halfResult >> 8);
|
||
parity_overflow_result_ = (uint8_t)(overflow >> 13);
|
||
|
||
*(uint16_t *)operation->destination = (uint16_t)result;
|
||
} break;
|
||
|
||
case MicroOp::SBC16: {
|
||
memptr_.full = *(uint16_t *)operation->source;
|
||
uint16_t sourceValue = memptr_.full;
|
||
uint16_t destinationValue = *(uint16_t *)operation->destination;
|
||
int result = destinationValue - sourceValue - (carry_result_ & Flag::Carry);
|
||
int halfResult = (destinationValue&0xfff) - (sourceValue&0xfff) - (carry_result_ & Flag::Carry);
|
||
|
||
// subtraction, so parity rules are:
|
||
// signs of operands were different,
|
||
// sign of result is different
|
||
int overflow = (result ^ destinationValue) & (sourceValue ^ destinationValue);
|
||
|
||
bit53_result_ =
|
||
sign_result_ = (uint8_t)(result >> 8);
|
||
zero_result_ = (uint8_t)(result | sign_result_);
|
||
subtract_flag_ = Flag::Subtract;
|
||
carry_result_ = (uint8_t)(result >> 16);
|
||
half_carry_result_ = (uint8_t)(halfResult >> 8);
|
||
parity_overflow_result_ = (uint8_t)(overflow >> 13);
|
||
|
||
*(uint16_t *)operation->destination = (uint16_t)result;
|
||
} break;
|
||
|
||
#pragma mark - Conditionals
|
||
|
||
#define decline_conditional() \
|
||
if(operation->source) { \
|
||
scheduled_program_counter_ = (MicroOp *)operation->source; \
|
||
} else { \
|
||
advance_operation(); \
|
||
}
|
||
|
||
case MicroOp::TestNZ: if(!zero_result_) { decline_conditional(); } break;
|
||
case MicroOp::TestZ: if(zero_result_) { decline_conditional(); } break;
|
||
case MicroOp::TestNC: if(carry_result_ & Flag::Carry) { decline_conditional(); } break;
|
||
case MicroOp::TestC: if(!(carry_result_ & Flag::Carry)) { decline_conditional(); } break;
|
||
case MicroOp::TestPO: if(parity_overflow_result_ & Flag::Parity) { decline_conditional(); } break;
|
||
case MicroOp::TestPE: if(!(parity_overflow_result_ & Flag::Parity)) { decline_conditional(); } break;
|
||
case MicroOp::TestP: if(sign_result_ & Flag::Sign) { decline_conditional(); } break;
|
||
case MicroOp::TestM: if(!(sign_result_ & Flag::Sign)) { decline_conditional(); } break;
|
||
|
||
#undef decline_conditional
|
||
|
||
#pragma mark - Exchange
|
||
|
||
#define swap(a, b) temp = a.full; a.full = b.full; b.full = temp;
|
||
|
||
case MicroOp::ExDEHL: {
|
||
uint16_t temp;
|
||
swap(de_, hl_);
|
||
} break;
|
||
|
||
case MicroOp::ExAFAFDash: {
|
||
uint8_t a = a_;
|
||
uint8_t f = get_flags();
|
||
set_flags(afDash_.bytes.low);
|
||
a_ = afDash_.bytes.high;
|
||
afDash_.bytes.high = a;
|
||
afDash_.bytes.low = f;
|
||
} break;
|
||
|
||
case MicroOp::EXX: {
|
||
uint16_t temp;
|
||
swap(de_, deDash_);
|
||
swap(bc_, bcDash_);
|
||
swap(hl_, hlDash_);
|
||
} break;
|
||
|
||
#undef swap
|
||
|
||
#pragma mark - Repetition
|
||
|
||
#define REPEAT(test) \
|
||
if(test) { \
|
||
pc_.full -= 2; \
|
||
} else { \
|
||
advance_operation(); \
|
||
}
|
||
|
||
#define LDxR_STEP(dir) \
|
||
bc_.full--; \
|
||
de_.full += dir; \
|
||
hl_.full += dir; \
|
||
uint8_t sum = a_ + temp8_; \
|
||
bit53_result_ = (uint8_t)((sum&0x8) | ((sum & 0x02) << 4)); \
|
||
subtract_flag_ = 0; \
|
||
half_carry_result_ = 0; \
|
||
parity_overflow_result_ = bc_.full ? Flag::Parity : 0;
|
||
|
||
case MicroOp::LDDR: {
|
||
LDxR_STEP(-1);
|
||
REPEAT(bc_.full);
|
||
} break;
|
||
|
||
case MicroOp::LDIR: {
|
||
LDxR_STEP(1);
|
||
REPEAT(bc_.full);
|
||
} break;
|
||
|
||
case MicroOp::LDD: {
|
||
LDxR_STEP(-1);
|
||
} break;
|
||
|
||
case MicroOp::LDI: {
|
||
LDxR_STEP(1);
|
||
} break;
|
||
|
||
#undef LDxR_STEP
|
||
|
||
#define CPxR_STEP(dir) \
|
||
hl_.full += dir; \
|
||
bc_.full--; \
|
||
\
|
||
uint8_t result = a_ - temp8_; \
|
||
uint8_t halfResult = (a_&0xf) - (temp8_&0xf); \
|
||
\
|
||
parity_overflow_result_ = bc_.full ? Flag::Parity : 0; \
|
||
half_carry_result_ = halfResult; \
|
||
subtract_flag_ = Flag::Subtract; \
|
||
sign_result_ = zero_result_ = result; \
|
||
\
|
||
result -= (halfResult >> 4)&1; \
|
||
bit53_result_ = (uint8_t)((result&0x8) | ((result&0x2) << 4)); \
|
||
|
||
case MicroOp::CPDR: {
|
||
CPxR_STEP(-1);
|
||
REPEAT(bc_.full && sign_result_);
|
||
} break;
|
||
|
||
case MicroOp::CPIR: {
|
||
CPxR_STEP(1);
|
||
REPEAT(bc_.full && sign_result_);
|
||
} break;
|
||
|
||
case MicroOp::CPD: {
|
||
memptr_.full--;
|
||
CPxR_STEP(-1);
|
||
} break;
|
||
|
||
case MicroOp::CPI: {
|
||
memptr_.full++;
|
||
CPxR_STEP(1);
|
||
} break;
|
||
|
||
#undef CPxR_STEP
|
||
|
||
#define INxR_STEP(dir) \
|
||
bc_.bytes.high--; \
|
||
hl_.full += dir; \
|
||
\
|
||
sign_result_ = zero_result_ = bit53_result_ = bc_.bytes.high; \
|
||
subtract_flag_ = (temp8_ >> 6) & Flag::Subtract; \
|
||
\
|
||
int next_bc = bc_.bytes.low + dir; \
|
||
int summation = temp8_ + (next_bc&0xff); \
|
||
\
|
||
if(summation > 0xff) { \
|
||
carry_result_ = Flag::Carry; \
|
||
half_carry_result_ = Flag::HalfCarry; \
|
||
} else { \
|
||
carry_result_ = 0; \
|
||
half_carry_result_ = 0; \
|
||
} \
|
||
\
|
||
summation = (summation&7) ^ bc_.bytes.high; \
|
||
set_parity(summation);
|
||
|
||
case MicroOp::INDR: {
|
||
INxR_STEP(-1);
|
||
REPEAT(bc_.bytes.high);
|
||
} break;
|
||
|
||
case MicroOp::INIR: {
|
||
INxR_STEP(1);
|
||
REPEAT(bc_.bytes.high);
|
||
} break;
|
||
|
||
case MicroOp::IND: {
|
||
memptr_.full = bc_.full - 1;
|
||
INxR_STEP(-1);
|
||
} break;
|
||
|
||
case MicroOp::INI: {
|
||
memptr_.full = bc_.full + 1;
|
||
INxR_STEP(1);
|
||
} break;
|
||
|
||
#undef INxR_STEP
|
||
|
||
#define OUTxR_STEP(dir) \
|
||
bc_.bytes.high--; \
|
||
hl_.full += dir; \
|
||
\
|
||
sign_result_ = zero_result_ = bit53_result_ = bc_.bytes.high; \
|
||
subtract_flag_ = (temp8_ >> 6) & Flag::Subtract; \
|
||
\
|
||
int summation = temp8_ + hl_.bytes.low; \
|
||
if(summation > 0xff) { \
|
||
carry_result_ = Flag::Carry; \
|
||
half_carry_result_ = Flag::HalfCarry; \
|
||
} else { \
|
||
carry_result_ = half_carry_result_ = 0; \
|
||
} \
|
||
\
|
||
summation = (summation&7) ^ bc_.bytes.high; \
|
||
set_parity(summation);
|
||
|
||
case MicroOp::OUT_R:
|
||
REPEAT(bc_.bytes.high);
|
||
break;
|
||
|
||
case MicroOp::OUTD: {
|
||
OUTxR_STEP(-1);
|
||
memptr_.full = bc_.full - 1;
|
||
} break;
|
||
|
||
case MicroOp::OUTI: {
|
||
OUTxR_STEP(1);
|
||
memptr_.full = bc_.full + 1;
|
||
} break;
|
||
|
||
#undef OUTxR_STEP
|
||
|
||
#pragma mark - Bit Manipulation
|
||
|
||
case MicroOp::BIT: {
|
||
uint8_t result = *(uint8_t *)operation->source & (1 << ((operation_ >> 3)&7));
|
||
|
||
if(current_instruction_page_->is_indexed || ((operation_&0x08) == 7)) {
|
||
bit53_result_ = memptr_.bytes.high;
|
||
} else {
|
||
bit53_result_ = *(uint8_t *)operation->source;
|
||
}
|
||
|
||
sign_result_ = zero_result_ = result;
|
||
half_carry_result_ = Flag::HalfCarry;
|
||
subtract_flag_ = 0;
|
||
parity_overflow_result_ = result ? 0 : Flag::Parity;
|
||
} break;
|
||
|
||
case MicroOp::RES:
|
||
*(uint8_t *)operation->source &= ~(1 << ((operation_ >> 3)&7));
|
||
break;
|
||
|
||
case MicroOp::SET:
|
||
*(uint8_t *)operation->source |= (1 << ((operation_ >> 3)&7));
|
||
break;
|
||
|
||
#pragma mark - Rotation and shifting
|
||
|
||
#define set_rotate_flags() \
|
||
bit53_result_ = a_; \
|
||
carry_result_ = new_carry; \
|
||
subtract_flag_ = half_carry_result_ = 0;
|
||
|
||
case MicroOp::RLA: {
|
||
uint8_t new_carry = a_ >> 7;
|
||
a_ = (uint8_t)((a_ << 1) | (carry_result_ & Flag::Carry));
|
||
set_rotate_flags();
|
||
} break;
|
||
|
||
case MicroOp::RRA: {
|
||
uint8_t new_carry = a_ & 1;
|
||
a_ = (uint8_t)((a_ >> 1) | (carry_result_ << 7));
|
||
set_rotate_flags();
|
||
} break;
|
||
|
||
case MicroOp::RLCA: {
|
||
uint8_t new_carry = a_ >> 7;
|
||
a_ = (uint8_t)((a_ << 1) | new_carry);
|
||
set_rotate_flags();
|
||
} break;
|
||
|
||
case MicroOp::RRCA: {
|
||
uint8_t new_carry = a_ & 1;
|
||
a_ = (uint8_t)((a_ >> 1) | (new_carry << 7));
|
||
set_rotate_flags();
|
||
} break;
|
||
|
||
#undef set_rotate_flags
|
||
|
||
#define set_shift_flags() \
|
||
sign_result_ = zero_result_ = bit53_result_ = *(uint8_t *)operation->source; \
|
||
set_parity(sign_result_); \
|
||
half_carry_result_ = 0; \
|
||
subtract_flag_ = 0;
|
||
|
||
case MicroOp::RLC:
|
||
carry_result_ = *(uint8_t *)operation->source >> 7;
|
||
*(uint8_t *)operation->source = (uint8_t)((*(uint8_t *)operation->source << 1) | carry_result_);
|
||
set_shift_flags();
|
||
break;
|
||
|
||
case MicroOp::RRC:
|
||
carry_result_ = *(uint8_t *)operation->source;
|
||
*(uint8_t *)operation->source = (uint8_t)((*(uint8_t *)operation->source >> 1) | (carry_result_ << 7));
|
||
set_shift_flags();
|
||
break;
|
||
|
||
case MicroOp::RL: {
|
||
uint8_t next_carry = *(uint8_t *)operation->source >> 7;
|
||
*(uint8_t *)operation->source = (uint8_t)((*(uint8_t *)operation->source << 1) | (carry_result_ & Flag::Carry));
|
||
carry_result_ = next_carry;
|
||
set_shift_flags();
|
||
} break;
|
||
|
||
case MicroOp::RR: {
|
||
uint8_t next_carry = *(uint8_t *)operation->source;
|
||
*(uint8_t *)operation->source = (uint8_t)((*(uint8_t *)operation->source >> 1) | (carry_result_ << 7));
|
||
carry_result_ = next_carry;
|
||
set_shift_flags();
|
||
} break;
|
||
|
||
case MicroOp::SLA:
|
||
carry_result_ = *(uint8_t *)operation->source >> 7;
|
||
*(uint8_t *)operation->source = (uint8_t)(*(uint8_t *)operation->source << 1);
|
||
set_shift_flags();
|
||
break;
|
||
|
||
case MicroOp::SRA:
|
||
carry_result_ = *(uint8_t *)operation->source;
|
||
*(uint8_t *)operation->source = (uint8_t)((*(uint8_t *)operation->source >> 1) | (*(uint8_t *)operation->source & 0x80));
|
||
set_shift_flags();
|
||
break;
|
||
|
||
case MicroOp::SLL:
|
||
carry_result_ = *(uint8_t *)operation->source >> 7;
|
||
*(uint8_t *)operation->source = (uint8_t)(*(uint8_t *)operation->source << 1) | 1;
|
||
set_shift_flags();
|
||
break;
|
||
|
||
case MicroOp::SRL:
|
||
carry_result_ = *(uint8_t *)operation->source;
|
||
*(uint8_t *)operation->source = (uint8_t)((*(uint8_t *)operation->source >> 1));
|
||
set_shift_flags();
|
||
break;
|
||
|
||
#undef set_shift_flags
|
||
|
||
#define set_decimal_rotate_flags() \
|
||
subtract_flag_ = 0; \
|
||
half_carry_result_ = 0; \
|
||
set_parity(a_); \
|
||
bit53_result_ = zero_result_ = sign_result_ = a_;
|
||
|
||
case MicroOp::RRD: {
|
||
memptr_.full = hl_.full + 1;
|
||
uint8_t low_nibble = a_ & 0xf;
|
||
a_ = (a_ & 0xf0) | (temp8_ & 0xf);
|
||
temp8_ = (uint8_t)((temp8_ >> 4) | (low_nibble << 4));
|
||
set_decimal_rotate_flags();
|
||
} break;
|
||
|
||
case MicroOp::RLD: {
|
||
memptr_.full = hl_.full + 1;
|
||
uint8_t low_nibble = a_ & 0xf;
|
||
a_ = (a_ & 0xf0) | (temp8_ >> 4);
|
||
temp8_ = (uint8_t)((temp8_ << 4) | low_nibble);
|
||
set_decimal_rotate_flags();
|
||
} break;
|
||
|
||
#undef set_decimal_rotate_flags
|
||
|
||
|
||
#pragma mark - Interrupt state
|
||
|
||
case MicroOp::EI:
|
||
iff1_ = iff2_ = true;
|
||
if(irq_line_) request_status_ |= Interrupt::IRQ;
|
||
break;
|
||
|
||
case MicroOp::DI:
|
||
iff1_ = iff2_ = false;
|
||
request_status_ &= ~Interrupt::IRQ;
|
||
break;
|
||
|
||
case MicroOp::IM:
|
||
switch(operation_ & 0x18) {
|
||
case 0x00: interrupt_mode_ = 0; break;
|
||
case 0x08: interrupt_mode_ = 0; break; // IM 0/1
|
||
case 0x10: interrupt_mode_ = 1; break;
|
||
case 0x18: interrupt_mode_ = 2; break;
|
||
}
|
||
break;
|
||
|
||
#pragma mark - Input
|
||
|
||
case MicroOp::SetInFlags:
|
||
subtract_flag_ = half_carry_result_ = 0;
|
||
sign_result_ = zero_result_ = bit53_result_ = *(uint8_t *)operation->source;
|
||
set_parity(sign_result_);
|
||
break;
|
||
|
||
case MicroOp::SetAFlags:
|
||
subtract_flag_ = half_carry_result_ = 0;
|
||
parity_overflow_result_ = iff2_ ? Flag::Parity : 0;
|
||
sign_result_ = zero_result_ = bit53_result_ = a_;
|
||
break;
|
||
|
||
case MicroOp::SetZero:
|
||
temp8_ = 0;
|
||
break;
|
||
|
||
#pragma mark - Special-case Flow
|
||
|
||
case MicroOp::BeginIRQMode0:
|
||
pc_increment_ = 0; // deliberate fallthrough
|
||
case MicroOp::BeginIRQ:
|
||
iff2_ = iff1_ = false;
|
||
request_status_ &= ~Interrupt::IRQ;
|
||
temp16_.full = 0x38;
|
||
break;
|
||
|
||
case MicroOp::BeginNMI:
|
||
iff2_ = iff1_;
|
||
iff1_ = false;
|
||
request_status_ &= ~Interrupt::IRQ;
|
||
break;
|
||
|
||
case MicroOp::JumpTo66:
|
||
pc_.full = 0x66;
|
||
break;
|
||
|
||
case MicroOp::RETN:
|
||
iff1_ = iff2_;
|
||
if(irq_line_ && iff1_) request_status_ |= Interrupt::IRQ;
|
||
break;
|
||
|
||
case MicroOp::HALT:
|
||
halt_mask_ = 0x00;
|
||
break;
|
||
|
||
#pragma mark - Interrupt handling
|
||
|
||
case MicroOp::Reset:
|
||
iff1_ = iff2_ = false;
|
||
interrupt_mode_ = 0;
|
||
pc_.full = 0;
|
||
sp_.full = 0xffff;
|
||
a_ = 0xff;
|
||
set_flags(0xff);
|
||
ir_.full = 0;
|
||
break;
|
||
|
||
#pragma mark - Internal bookkeeping
|
||
|
||
case MicroOp::SetInstructionPage:
|
||
current_instruction_page_ = (InstructionPage *)operation->source;
|
||
scheduled_program_counter_ = current_instruction_page_->fetch_decode_execute_data;
|
||
break;
|
||
|
||
case MicroOp::CalculateIndexAddress:
|
||
memptr_.full = (uint16_t)(*(uint16_t *)operation->source + (int8_t)temp8_);
|
||
break;
|
||
|
||
case MicroOp::IndexedPlaceHolder:
|
||
printf("Hit placeholder!!!\n");
|
||
return;
|
||
}
|
||
#undef set_parity
|
||
}
|
||
|
||
}
|
||
}
|
||
|
||
/*!
|
||
Called to announce the end of a run_for_cycles period, allowing deferred work to take place.
|
||
|
||
Users of the Z80 template may override this.
|
||
*/
|
||
void flush() {}
|
||
|
||
int perform_machine_cycle(const PartialMachineCycle &cycle) {
|
||
return 0;
|
||
}
|
||
|
||
/*!
|
||
Gets the flags register.
|
||
|
||
@see set_flags
|
||
|
||
@returns The current value of the flags register.
|
||
*/
|
||
uint8_t get_flags() {
|
||
uint8_t result =
|
||
(sign_result_ & Flag::Sign) |
|
||
(zero_result_ ? 0 : Flag::Zero) |
|
||
(bit53_result_ & (Flag::Bit5 | Flag::Bit3)) |
|
||
(half_carry_result_ & Flag::HalfCarry) |
|
||
(parity_overflow_result_ & Flag::Parity) |
|
||
subtract_flag_ |
|
||
(carry_result_ & Flag::Carry);
|
||
return result;
|
||
}
|
||
|
||
/*!
|
||
Sets the flags register.
|
||
|
||
@see set_flags
|
||
|
||
@param flags The new value of the flags register.
|
||
*/
|
||
void set_flags(uint8_t flags) {
|
||
sign_result_ = flags;
|
||
zero_result_ = (flags & Flag::Zero) ^ Flag::Zero;
|
||
bit53_result_ = flags;
|
||
half_carry_result_ = flags;
|
||
parity_overflow_result_ = flags;
|
||
subtract_flag_ = flags & Flag::Subtract;
|
||
carry_result_ = flags;
|
||
}
|
||
|
||
/*!
|
||
Gets the value of a register.
|
||
|
||
@see set_value_of_register
|
||
|
||
@param r The register to set.
|
||
@returns The value of the register. 8-bit registers will be returned as unsigned.
|
||
*/
|
||
uint16_t get_value_of_register(Register r) {
|
||
switch (r) {
|
||
case Register::ProgramCounter: return pc_.full;
|
||
case Register::StackPointer: return sp_.full;
|
||
|
||
case Register::A: return a_;
|
||
case Register::Flags: return get_flags();
|
||
case Register::AF: return (uint16_t)((a_ << 8) | get_flags());
|
||
case Register::B: return bc_.bytes.high;
|
||
case Register::C: return bc_.bytes.low;
|
||
case Register::BC: return bc_.full;
|
||
case Register::D: return de_.bytes.high;
|
||
case Register::E: return de_.bytes.low;
|
||
case Register::DE: return de_.full;
|
||
case Register::H: return hl_.bytes.high;
|
||
case Register::L: return hl_.bytes.low;
|
||
case Register::HL: return hl_.full;
|
||
|
||
case Register::ADash: return afDash_.bytes.high;
|
||
case Register::FlagsDash: return afDash_.bytes.low;
|
||
case Register::AFDash: return afDash_.full;
|
||
case Register::BDash: return bcDash_.bytes.high;
|
||
case Register::CDash: return bcDash_.bytes.low;
|
||
case Register::BCDash: return bcDash_.full;
|
||
case Register::DDash: return deDash_.bytes.high;
|
||
case Register::EDash: return deDash_.bytes.low;
|
||
case Register::DEDash: return deDash_.full;
|
||
case Register::HDash: return hlDash_.bytes.high;
|
||
case Register::LDash: return hlDash_.bytes.low;
|
||
case Register::HLDash: return hlDash_.full;
|
||
|
||
case Register::IXh: return ix_.bytes.high;
|
||
case Register::IXl: return ix_.bytes.low;
|
||
case Register::IX: return ix_.full;
|
||
case Register::IYh: return iy_.bytes.high;
|
||
case Register::IYl: return iy_.bytes.low;
|
||
case Register::IY: return iy_.full;
|
||
|
||
case Register::R: return ir_.bytes.low;
|
||
case Register::I: return ir_.bytes.high;
|
||
case Register::Refresh: return ir_.full;
|
||
|
||
case Register::IFF1: return iff1_ ? 1 : 0;
|
||
case Register::IFF2: return iff2_ ? 1 : 0;
|
||
case Register::IM: return (uint16_t)interrupt_mode_;
|
||
|
||
default: return 0;
|
||
}
|
||
}
|
||
|
||
/*!
|
||
Sets the value of a register.
|
||
|
||
@see get_value_of_register
|
||
|
||
@param r The register to set.
|
||
@param value The value to set. If the register is only 8 bit, the value will be truncated.
|
||
*/
|
||
void set_value_of_register(Register r, uint16_t value) {
|
||
switch (r) {
|
||
case Register::ProgramCounter: pc_.full = value; break;
|
||
case Register::StackPointer: sp_.full = value; break;
|
||
|
||
case Register::A: a_ = (uint8_t)value; break;
|
||
case Register::AF: a_ = (uint8_t)(value >> 8); // deliberate fallthrough...
|
||
case Register::Flags: set_flags((uint8_t)value); break;
|
||
|
||
case Register::B: bc_.bytes.high = (uint8_t)value; break;
|
||
case Register::C: bc_.bytes.low = (uint8_t)value; break;
|
||
case Register::BC: bc_.full = value; break;
|
||
case Register::D: de_.bytes.high = (uint8_t)value; break;
|
||
case Register::E: de_.bytes.low = (uint8_t)value; break;
|
||
case Register::DE: de_.full = value; break;
|
||
case Register::H: hl_.bytes.high = (uint8_t)value; break;
|
||
case Register::L: hl_.bytes.low = (uint8_t)value; break;
|
||
case Register::HL: hl_.full = value; break;
|
||
|
||
case Register::ADash: afDash_.bytes.high = (uint8_t)value; break;
|
||
case Register::FlagsDash: afDash_.bytes.low = (uint8_t)value; break;
|
||
case Register::AFDash: afDash_.full = value; break;
|
||
case Register::BDash: bcDash_.bytes.high = (uint8_t)value; break;
|
||
case Register::CDash: bcDash_.bytes.low = (uint8_t)value; break;
|
||
case Register::BCDash: bcDash_.full = value; break;
|
||
case Register::DDash: deDash_.bytes.high = (uint8_t)value; break;
|
||
case Register::EDash: deDash_.bytes.low = (uint8_t)value; break;
|
||
case Register::DEDash: deDash_.full = value; break;
|
||
case Register::HDash: hlDash_.bytes.high = (uint8_t)value; break;
|
||
case Register::LDash: hlDash_.bytes.low = (uint8_t)value; break;
|
||
case Register::HLDash: hlDash_.full = value; break;
|
||
|
||
case Register::IXh: ix_.bytes.high = (uint8_t)value; break;
|
||
case Register::IXl: ix_.bytes.low = (uint8_t)value; break;
|
||
case Register::IX: ix_.full = value; break;
|
||
case Register::IYh: iy_.bytes.high = (uint8_t)value; break;
|
||
case Register::IYl: iy_.bytes.low = (uint8_t)value; break;
|
||
case Register::IY: iy_.full = value; break;
|
||
|
||
case Register::R: ir_.bytes.low = (uint8_t)value; break;
|
||
case Register::I: ir_.bytes.high = (uint8_t)value; break;
|
||
case Register::Refresh: ir_.full = (uint16_t)value; break;
|
||
|
||
case Register::IFF1: iff1_ = !!value; break;
|
||
case Register::IFF2: iff2_ = !!value; break;
|
||
case Register::IM: interrupt_mode_ = value % 3; break;
|
||
|
||
default: break;
|
||
}
|
||
}
|
||
|
||
/*!
|
||
Gets the value of the HALT output line.
|
||
*/
|
||
bool get_halt_line() {
|
||
return halt_mask_ == 0x00;
|
||
}
|
||
|
||
/*!
|
||
Sets the logical value of the interrupt line.
|
||
|
||
@param offset If called while within perform_machine_cycle this may be a value indicating
|
||
how many cycles before now the line changed state. The value may not be longer than the
|
||
current machine cycle. If called at any other time, this must be zero.
|
||
*/
|
||
void set_interrupt_line(bool value, int offset = 0) {
|
||
if(irq_line_ == value) return;
|
||
|
||
// IRQ requests are level triggered and masked.
|
||
irq_line_ = value;
|
||
if(irq_line_ && iff1_) {
|
||
request_status_ |= Interrupt::IRQ;
|
||
} else {
|
||
request_status_ &= ~Interrupt::IRQ;
|
||
}
|
||
|
||
// If this change happened at least one cycle ago then: (i) we're promised that this is a machine
|
||
// cycle per the contract on supplying an offset; and (ii) that means it happened before the lines
|
||
// were sampled. So adjust the most recent sample.
|
||
if(offset < 0) {
|
||
last_request_status_ = (last_request_status_ & ~Interrupt::IRQ) | (request_status_ & Interrupt::IRQ);
|
||
}
|
||
}
|
||
|
||
bool get_interrupt_line() {
|
||
return irq_line_;
|
||
}
|
||
|
||
/*!
|
||
Sets the logical value of the non-maskable interrupt line.
|
||
|
||
@param offset See discussion in set_interrupt_line.
|
||
*/
|
||
void set_non_maskable_interrupt_line(bool value, int offset = 0) {
|
||
// NMIs are edge triggered and cannot be masked.
|
||
nmi_line_ = value;
|
||
if(value) {
|
||
request_status_ |= Interrupt::NMI;
|
||
if(offset < 0) {
|
||
last_request_status_ |= Interrupt::NMI;
|
||
}
|
||
}
|
||
}
|
||
|
||
bool get_non_maskable_interrupt_line() {
|
||
return nmi_line_;
|
||
}
|
||
|
||
/*!
|
||
Sets the logical value of the bus request line.
|
||
*/
|
||
void set_bus_request_line(bool value) {
|
||
bus_request_line_ = value;
|
||
}
|
||
|
||
bool get_bus_request_line() {
|
||
return bus_request_line_;
|
||
}
|
||
|
||
/*!
|
||
Sets the logical value of the reset line.
|
||
*/
|
||
void set_reset_line(bool value) {
|
||
// Reset requests are level triggered and cannot be masked.
|
||
if(value) request_status_ |= Interrupt::Reset;
|
||
else request_status_ &= ~Interrupt::Reset;
|
||
}
|
||
|
||
/*!
|
||
This emulation automatically sets itself up in power-on state at creation, which has the effect of triggering a
|
||
reset at the first opportunity. Use @c reset_power_on to disable that behaviour.
|
||
*/
|
||
inline void reset_power_on() {
|
||
request_status_ &= ~Interrupt::PowerOn;
|
||
last_request_status_ &= ~Interrupt::PowerOn;
|
||
}
|
||
|
||
/*!
|
||
Sets the logical value of the wait line.
|
||
*/
|
||
inline void set_wait_line(bool value) {
|
||
wait_line_ = value;
|
||
}
|
||
|
||
bool get_wait_line() {
|
||
return wait_line_;
|
||
}
|
||
};
|
||
|
||
}
|
||
}
|
||
|
||
#endif /* Z80_hpp */
|