opcode

Documentation

Overview

Package opcode provides/defines Z80's instruction set and its operation codes.

Index

• Variables
• func DumpDecodeLayer(w io.Writer) error
• func WriteSwitchDecoder(w io.Writer) error
• type Code
  • func (c Code) String() string
• type OPCode
  • func (op *OPCode) String() string

Variables

var AllOPCodes = [][]*OPCode{
	load8,
	load16,
	exbtsg,
	arith8,
	ctrl,
	arith16,
	rotateshift,
	bitop,
	jump,
	callret,
	inout,
	undoc,
}

AllOPCodes includes all operations of Z80.

Functions

func DumpDecodeLayer

func DumpDecodeLayer(w io.Writer) error

DumpDecodeLayer dumps default decode layer to io.Writer for debugging

func WriteSwitchDecoder

func WriteSwitchDecoder(w io.Writer) error

WriteSwitchDecoder writes codes for decoder "switch" statements.

Types

type Code

type Code struct {
	C uint8
	M uint8
	V func(uint8) bool
}

Code is definition of an operation code. (mask). 0 bits in M are for constant bits, 1 bits are variable bits for operation code.

func (Code) String

func (c Code) String() string

type OPCode

type OPCode struct {
	// N is string presentation (=label) of opcode.
	N string

	// C is codes definition.
	C []Code

	// T is T cycle and its length is M cycle.
	T []int

	// T2 is T cycle for the special conditions.
	T2 []int
}

OPCode defines opration code and its function.

func (*OPCode) String

func (op *OPCode) String() string