53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
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//
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// Created by william on 1/9/24.
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//
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#ifndef NESEMULATOR_DECODING_H
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#define NESEMULATOR_DECODING_H
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#include "../include/types.h"
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#include "../include/system.h"
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#include "cpu.h"
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typedef enum {
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ADDR_MODE_ABSOLUTE, // a
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ADDR_MODE_ABSOLUTE_INDEXED_X, // a,x
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ADDR_MODE_ABSOLUTE_INDEXED_Y, // a,y
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ADDR_MODE_ACCUMULATOR, // A
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ADDR_MODE_IMMEDIATE, // #i
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ADDR_MODE_IMPLICIT, // Imp
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ADDR_MODE_INDIRECT_X, // (d,x)
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ADDR_MODE_INDIRECT_JUMP, //
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ADDR_MODE_INDIRECT_Y, // (d),y
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ADDR_MODE_RELATIVE, // label
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ADDR_MODE_ZERO_PAGE, // d
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ADDR_MODE_ZERO_PAGE_INDEXED_X, // d,x
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ADDR_MODE_ZERO_PAGE_INDEXED_Y, // d,y
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} AddressingMode;
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enum OperandType {
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OPERAND_TYPE_ACCUMULATOR,
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OPERAND_TYPE_IMMEDIATE,
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OPERAND_TYPE_ADDRESS
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};
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typedef struct {
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word value;
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enum OperandType type;
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bool is_page_crossing;
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} Operand;
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address decode_operand_addr(System *system, AddressingMode addr_mode, bool *page_crossing);
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Operand decode_operand(System *system, AddressingMode addr_mode);
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byte read_operand(System *system, Operand operand);
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char *get_addr_mode_name(AddressingMode addr_mode);
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char *operand_name(Operand *operand);
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char *get_op_code_name(byte op);
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#endif //NESEMULATOR_DECODING_H
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