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138 lines
3.2 KiB
C++
138 lines
3.2 KiB
C++
//
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// State.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 14/05/2020.
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// Copyright © 2020 Thomas Harte. All rights reserved.
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//
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#ifndef MC68000_State_hpp
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#define MC68000_State_hpp
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#include "../../../Reflection/Enum.hpp"
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#include "../../../Reflection/Struct.hpp"
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#include "../68000.hpp"
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namespace CPU {
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namespace MC68000 {
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/*!
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Provides a means for capturing or restoring complete 68000 state.
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This is an optional adjunct to the 68000 class. If you want to take the rest of the 68000
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implementation but don't want any of the overhead of my sort-of half-reflection as
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encapsulated in Reflection/[Enum/Struct].hpp just don't use this class.
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*/
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struct State: public Reflection::StructImpl<State> {
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/*!
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Provides the current state of the well-known, published internal registers.
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*/
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struct Registers: public Reflection::StructImpl<Registers> {
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// Official registers.
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uint32_t data[8], address[7];
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uint32_t user_stack_pointer;
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uint32_t supervisor_stack_pointer;
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uint16_t status;
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uint32_t program_counter;
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// The 68000's prefetch queue.
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uint32_t prefetch;
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uint16_t instruction;
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Registers();
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} registers;
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/*!
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Provides the current state of the processor's various input lines that aren't
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related to an access cycle.
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*/
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struct Inputs: public Reflection::StructImpl<Inputs> {
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uint8_t bus_interrupt_level;
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bool dtack;
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bool is_peripheral_address;
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bool bus_error;
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bool bus_request;
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bool bus_grant;
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bool halt;
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Inputs();
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} inputs;
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/*!
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Contains internal state used by this particular implementation of a 68000. Most of it
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does not necessarily correlate with anything in a real 68000, and some of it very
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obviously doesn't.
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*/
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struct ExecutionState: public Reflection::StructImpl<ExecutionState> {
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uint8_t e_clock_phase;
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uint32_t effective_address[2];
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uint32_t source_data;
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uint32_t destination_data;
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bool last_trace_flag;
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uint16_t next_word;
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uint32_t dbcc_false_address;
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bool is_starting_interrupt;
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uint8_t pending_interrupt_level;
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uint8_t accepted_interrupt_level;
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// This is a reflective do-over of the ExecutionState enum within
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// MC68000Storage; I've yet to decide how happy I am with that
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// as an approach.
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ReflectableEnum(Phase,
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Executing,
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WaitingForDTack,
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Stopped,
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Halted,
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WillBeginInterrupt
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);
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Phase phase;
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bool active_program;
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uint32_t movem_final_address;
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uint32_t source_addresses[65];
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ReflectableEnum(MicroOpSource,
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ActiveProgram,
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LongException,
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ShortException,
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Interrupt
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);
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MicroOpSource micro_op_source;
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uint8_t micro_op;
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ReflectableEnum(BusStepSource,
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FollowMicroOp,
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BusError,
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Trap,
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Reset,
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BranchTaken,
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BranchByteNotTaken,
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BranchWordNotTaken,
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BSR,
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DBccConditionTrue,
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DBccConditionFalseNoBranch,
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DBccConditionFalseBranch,
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MovemRead,
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MovemWrite,
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);
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BusStepSource bus_step_source;
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uint8_t bus_step;
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ExecutionState();
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} execution_state;
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/// Default constructor; makes no guarantees as to field values beyond those given above.
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State();
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/// Instantiates a new State based on the processor @c src.
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State(const ProcessorBase &src);
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/// Applies this state to @c target.
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void apply(ProcessorBase &target);
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};
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}
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}
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#endif /* MC68000_State_hpp */
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