zog

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 Go to latest Published: Oct 28, 2024 License: MIT Imports: 15 Imported by: 0

README

zog

Z80 diassembler/assembler/emulator in golang

Update: Sat 28 Oct 11:38:39 BST 2017

So the cpu core passes zexdoc and has a quick and dirty pass for timing correct T-states. Similarly quick and dirty Spectrum screen and keyboard support and 'z80' file format support are sufficient to:

  1. boot the original spectrum 48K ROM to basic and run the Most Important Program:

    10 PRINT "HELLO"

    20 GOTO 10

  2. Load and run Manic Miner and Jetpac at what seem to be the correct speed.

  3. Fail to run Elite, perhaps due to lacking interrupt mode support.

I think I'm unlikely to take it any further, since the world doesn't need another spectrum emulator. However, this was a lot of fun and both rewarding and challenging. I'd obviously do things quite a lot differently if I did it again, but learning is kind of the point.

If by any chance you are here looking for a spectrum emulator, you will find better ones elsewhere. If you are looking for how to code an emulator, you will almost certainly find better code elsewhere. But if you are writing your own and want to share thoughts, please let me know :-)

Z80 diassembler/assembler/emulator in golang

Just revisiting the first bit of serious programming I ever did - a Z80 disassembler.

This code currently (June 2017) implements all the instruction decode logic and has a String() representation for instructions. There is also a basic assembler (using the github.com/pointlander/peg parser), so that the emulator tests can be written in assembly rather than machine code. This gives us bytes -> string -> bytes conversions.

I had ambitions of wiring an assembler which could parse the zexall code as a test suite, but a macro assembler is a bigger undertaking than I'd like to get into prior to actually having an emulator.

Instead, the zmac assembler can be used to build zexall and next steps are actually to write the emulator.

Documentation

Index

Constants

View Source 
const (
	Immediate = 2

	BCDEContents      = 5
	ImmediateContents = 6
)
View Source 
const (
	F_C flag = iota
	F_N
	F_PV
	F_3
	F_H
	F_5
	F_Z
	F_S
)
View Source 
const ClockHz = 3500000 / 2
View Source 
const HL_RP_INDEX = 2

Variables

View Source 
var EDSimpleNames []edSimpleName = []edSimpleName{
	{NEG, "NEG"},
	{RETN, "RETN"},
	{RETI, "RETI"},
	{RRD, "RRD"},
	{RLD, "RLD"},
	{IM0, "IM 0"},
	{IM1, "IM 1"},
	{IM2, "IM 2"},

	{LDI, "LDI"},
	{CPI, "CPI"},
	{LDD, "LDD"},
	{CPD, "CPD"},
	{LDIR, "LDIR"},
	{CPIR, "CPIR"},
	{LDDR, "LDDR"},
	{CPDR, "CPDR"},

	{INI, "INI"},
	{OUTI, "OUTI"},
	{IND, "IND"},
	{OUTD, "OUTD"},
	{INIR, "INIR"},
	{OTIR, "OTIR"},
	{INDR, "INDR"},
	{OTDR, "OTDR"},
}
View Source 
var ErrHalted = errors.New("HALT called")
View Source 
var R16Names []r16name = []r16name{
	{AF, "AF"},
	{AF_PRIME, "AF'"},
	{BC, "BC"},
	{DE, "DE"},
	{HL, "HL"},
	{IX, "IX"},
	{IY, "IY"},
	{SP, "SP"},
}
View Source 
var R8Names []r8name = []r8name{
	{A, "A"},
	{F, "F"},

	{B, "B"},
	{C, "C"},

	{D, "D"},
	{E, "E"},

	{H, "H"},
	{L, "L"},

	{IXL, "IXL"},
	{IXH, "IXH"},
	{IYL, "IYL"},
	{IYH, "IYH"},

	{I, "I"},
	{R, "R"},
}
View Source 
var TStateDuration = time.Second / time.Duration(ClockHz)

Functions

func Decode 

func Decode(r io.Reader) (chan Instruction, chan error)

func Encode 

func Encode(insts []Instruction) []byte

func NewAccum 

func NewAccum(name string, l Loc8) *accum

func NewRot 

func NewRot(name string, l Loc8, cpy Loc8) *rot

Types

type ADC16 

type ADC16 struct {
	InstBin16
}

func NewADC16 

func NewADC16(dst, src Loc16) *ADC16

func (*ADC16) Encode 

func (a *ADC16) Encode() []byte

func (*ADC16) Execute 

func (a *ADC16) Execute(z *Zog) error

func (*ADC16) String 

func (a *ADC16) String() string

func (*ADC16) TStates 

func (a *ADC16) TStates(z *Zog) int

type ADD16 

type ADD16 struct {
	InstBin16
}

func NewADD16 

func NewADD16(dst, src Loc16) *ADD16

func (*ADD16) Encode 

func (a *ADD16) Encode() []byte

func (*ADD16) Execute 

func (a *ADD16) Execute(z *Zog) error

func (*ADD16) String 

func (a *ADD16) String() string

func (*ADD16) TStates 

func (a *ADD16) TStates(z *Zog) int

type AccumInfo 

type AccumInfo struct {
	// contains filtered or unexported fields
}

type Assembly 

type Assembly struct {
	BaseAddr uint16
	Linsts   []LabelledInstruction
	Labels   map[string]int
	// contains filtered or unexported fields
}

func Assemble 

func Assemble(s string) (*Assembly, error)

func (*Assembly) Encode 

func (a *Assembly) Encode() ([]byte, error)

func (*Assembly) FindLabelAddr 

func (a *Assembly) FindLabelAddr(name string) (uint16, error)

func (*Assembly) Init 

func (a *Assembly) Init()

func (*Assembly) Instructions 

func (a *Assembly) Instructions() []Instruction

func (*Assembly) ResolveAddresses 

func (a *Assembly) ResolveAddresses() error

func (*Assembly) ResolveLoc16 

func (a *Assembly) ResolveLoc16(l Loc16) error

func (*Assembly) ResolveLoc8 

func (a *Assembly) ResolveLoc8(l Loc8) error

func (*Assembly) String 

func (a *Assembly) String() string

type BIT 

type BIT struct {
	InstU8
	// contains filtered or unexported fields
}

func NewBIT 

func NewBIT(num byte, l Loc8) *BIT

func (*BIT) Encode 

func (b *BIT) Encode() []byte

func (*BIT) Execute 

func (b *BIT) Execute(z *Zog) error

func (*BIT) String 

func (b *BIT) String() string

func (*BIT) TStates 

func (b *BIT) TStates(z *Zog) int

type CALL 

type CALL struct {
	InstU16
	// contains filtered or unexported fields
}

func NewCALL 

func NewCALL(c Conditional, l Loc16) *CALL

func (*CALL) Encode 

func (c *CALL) Encode() []byte

func (*CALL) Execute 

func (c *CALL) Execute(z *Zog) error

func (*CALL) String 

func (c *CALL) String() string

func (*CALL) TStates 

func (c *CALL) TStates(z *Zog) int

type Conditional 

type Conditional interface {
	String() string
	IsTrue(z *Zog) bool
}

type Contents 

type Contents struct {
	// contains filtered or unexported fields
}

func (Contents) Read16 

func (c Contents) Read16(z *Zog) (uint16, error)

func (Contents) Read8 

func (c Contents) Read8(z *Zog) (byte, error)

func (Contents) String 

func (c Contents) String() string

func (Contents) Write16 

func (c Contents) Write16(z *Zog, nn uint16) error

func (Contents) Write8 

func (c Contents) Write8(z *Zog, n byte) error

type Current 

type Current struct {
	// contains filtered or unexported fields
}

func (*Current) Accum 

func (c *Current) Accum(name string)

func (*Current) Adc16 

func (c *Current) Adc16()

func (*Current) Add16 

func (c *Current) Add16()

func (*Current) Bit 

func (c *Current) Bit()

func (*Current) Call 

func (c *Current) Call()

func (*Current) Conditional 

func (c *Current) Conditional(cc Conditional)

func (*Current) Copy8 

func (c *Current) Copy8()

func (*Current) Dec16 

func (c *Current) Dec16()

func (*Current) Dec8 

func (c *Current) Dec8()

func (*Current) DefByte 

func (c *Current) DefByte()

func (*Current) DefSpace 

func (c *Current) DefSpace()

func (*Current) DefWord 

func (c *Current) DefWord()

func (*Current) Disp0xHex 

func (c *Current) Disp0xHex(s string)

func (*Current) DispDecimal 

func (c *Current) DispDecimal(s string)

func (*Current) DispHex 

func (c *Current) DispHex(s string)

func (*Current) Djnz 

func (c *Current) Djnz()

func (*Current) Dst16 

func (c *Current) Dst16()

func (*Current) Dst8 

func (c *Current) Dst8()

func (*Current) EDSimple 

func (c *Current) EDSimple(name string)

func (*Current) Emit 

func (c *Current) Emit()

func (*Current) Ex 

func (c *Current) Ex()

func (*Current) GetAssembly 

func (c *Current) GetAssembly() *Assembly

func (*Current) IR16Contents 

func (c *Current) IR16Contents()

func (*Current) In 

func (c *Current) In()

func (*Current) Inc16 

func (c *Current) Inc16()

func (*Current) Inc8 

func (c *Current) Inc8()

func (*Current) Init 

func (c *Current) Init()

func (*Current) Jp 

func (c *Current) Jp()

func (*Current) Jr 

func (c *Current) Jr()

func (*Current) LD16 

func (c *Current) LD16()

func (*Current) LD8 

func (c *Current) LD8()

func (*Current) LabelDefn 

func (c *Current) LabelDefn(label string)

func (*Current) Loc16 

func (c *Current) Loc16()

func (*Current) Loc8 

func (c *Current) Loc8()

func (*Current) NNContents 

func (c *Current) NNContents()

func (*Current) NNLabel 

func (c *Current) NNLabel(label string)

func (*Current) NNhex 

func (c *Current) NNhex(s string)

func (*Current) Ndec 

func (c *Current) Ndec(s string)

func (*Current) Nhex 

func (c *Current) Nhex(s string)

func (*Current) ODigit 

func (c *Current) ODigit(s string)

func (*Current) Org 

func (c *Current) Org()

func (*Current) Out 

func (c *Current) Out()

func (*Current) Pop 

func (c *Current) Pop()

func (*Current) Push 

func (c *Current) Push()

func (*Current) R16 

func (c *Current) R16(s string)

func (*Current) R16Contents 

func (c *Current) R16Contents()

func (*Current) R8 

func (c *Current) R8(s string)

func (*Current) Res 

func (c *Current) Res()

func (*Current) Ret 

func (c *Current) Ret()

func (*Current) Rot 

func (c *Current) Rot(name string)

func (*Current) Rst 

func (c *Current) Rst()

func (*Current) Sbc16 

func (c *Current) Sbc16()

func (*Current) Set 

func (c *Current) Set()

func (*Current) Simple 

func (c *Current) Simple(name string)

func (*Current) Src16 

func (c *Current) Src16()

func (*Current) Src8 

func (c *Current) Src8()

type DEC16 

type DEC16 struct {
	InstU16
}

func NewDEC16 

func NewDEC16(l Loc16) *DEC16

func (*DEC16) Encode 

func (d *DEC16) Encode() []byte

func (*DEC16) Execute 

func (d *DEC16) Execute(z *Zog) error

func (*DEC16) String 

func (d *DEC16) String() string

func (*DEC16) TStates 

func (d *DEC16) TStates(z *Zog) int

type DEC8 

type DEC8 struct {
	InstU8
}

func NewDEC8 

func NewDEC8(l Loc8) *DEC8

func (*DEC8) Encode 

func (d *DEC8) Encode() []byte

func (*DEC8) Execute 

func (d *DEC8) Execute(z *Zog) error

func (*DEC8) String 

func (d *DEC8) String() string

func (*DEC8) TStates 

func (d *DEC8) TStates(z *Zog) int

type DJNZ 

type DJNZ struct {
	// contains filtered or unexported fields
}

func (*DJNZ) Encode 

func (d *DJNZ) Encode() []byte

func (*DJNZ) Execute 

func (d *DJNZ) Execute(z *Zog) error

func (*DJNZ) Resolve 

func (d *DJNZ) Resolve(a *Assembly) error

func (*DJNZ) String 

func (d *DJNZ) String() string

func (*DJNZ) TStates 

func (d *DJNZ) TStates(z *Zog) int

type Data 

type Data struct {
	// contains filtered or unexported fields
}

func NewData 

func NewData(data []byte) *Data

func (*Data) Encode 

func (d *Data) Encode() []byte

func (*Data) Execute 

func (d *Data) Execute(z *Zog) error

func (*Data) Resolve 

func (d *Data) Resolve(a *Assembly) error

func (*Data) String 

func (d *Data) String() string

func (*Data) TStates 

func (d *Data) TStates(z *Zog) int

type DecodeTable 

type DecodeTable struct {
	// contains filtered or unexported fields
}

func NewDecodeTable 

func NewDecodeTable(r io.Reader) *DecodeTable

func (*DecodeTable) LookupBLI 

func (t *DecodeTable) LookupBLI(a, b byte) Instruction

func (*DecodeTable) LookupR 

func (t *DecodeTable) LookupR(i byte) Loc8

func (*DecodeTable) LookupRP 

func (t *DecodeTable) LookupRP(i byte) Loc16

func (*DecodeTable) LookupRP2 

func (t *DecodeTable) LookupRP2(i byte) Loc16

func (*DecodeTable) ResetPrefix 

func (t *DecodeTable) ResetPrefix(n byte)

type Disp 

type Disp int8

func (Disp) String 

func (d Disp) String() string

type EDSimple 

type EDSimple byte
const (
	NEG  EDSimple = 0x44
	RETN EDSimple = 0x45
	RETI EDSimple = 0x4d

	RRD EDSimple = 0x67
	RLD EDSimple = 0x6f

	IM0 EDSimple = 0x46
	IM1 EDSimple = 0x56
	IM2 EDSimple = 0x5e

	LDI  EDSimple = 0xa0
	CPI  EDSimple = 0xa1
	LDD  EDSimple = 0xa8
	CPD  EDSimple = 0xa9
	LDIR EDSimple = 0xb0
	CPIR EDSimple = 0xb1
	LDDR EDSimple = 0xb8
	CPDR EDSimple = 0xb9

	INI  EDSimple = 0xa2
	OUTI EDSimple = 0xa3
	IND  EDSimple = 0xaa
	OUTD EDSimple = 0xab
	INIR EDSimple = 0xb2
	OTIR EDSimple = 0xb3
	INDR EDSimple = 0xba
	OTDR EDSimple = 0xbb
)

func LookupEDSimpleName 

func LookupEDSimpleName(name string) EDSimple

func (EDSimple) Encode 

func (s EDSimple) Encode() []byte

func (EDSimple) Execute 

func (s EDSimple) Execute(z *Zog) error

func (EDSimple) Resolve 

func (s EDSimple) Resolve(a *Assembly) error

func (EDSimple) String 

func (s EDSimple) String() string

func (EDSimple) TStates 

func (s EDSimple) TStates(z *Zog) int

type EX 

type EX struct {
	InstBin16
}

func NewEX 

func NewEX(dst, src Loc16) *EX

func (*EX) Encode 

func (ex *EX) Encode() []byte

func (*EX) Execute 

func (ex *EX) Execute(z *Zog) error

func (*EX) String 

func (ex *EX) String() string

func (*EX) TStates 

func (ex *EX) TStates(z *Zog) int

type FlagTest 

type FlagTest int
const (
	FT_Z FlagTest = iota
	FT_C
	FT_PO
	FT_PE
	FT_P
	FT_M
)

func (FlagTest) IsTrue 

func (ft FlagTest) IsTrue(z *Zog) bool

func (FlagTest) String 

func (ft FlagTest) String() string

type IN 

type IN struct {
	// contains filtered or unexported fields
}

func (*IN) Encode 

func (i *IN) Encode() []byte

func (*IN) Execute 

func (i *IN) Execute(z *Zog) error

func (*IN) Resolve 

func (i *IN) Resolve(a *Assembly) error

func (*IN) String 

func (i *IN) String() string

func (*IN) TStates 

func (i *IN) TStates(z *Zog) int

type INC16 

type INC16 struct {
	InstU16
}

func NewINC16 

func NewINC16(l Loc16) *INC16

func (*INC16) Encode 

func (i *INC16) Encode() []byte

func (*INC16) Execute 

func (i *INC16) Execute(z *Zog) error

func (*INC16) String 

func (i *INC16) String() string

func (*INC16) TStates 

func (i *INC16) TStates(z *Zog) int

type INC8 

type INC8 struct {
	InstU8
}

func NewINC8 

func NewINC8(l Loc8) *INC8

func (*INC8) Encode 

func (i *INC8) Encode() []byte

func (*INC8) Execute 

func (i *INC8) Execute(z *Zog) error

func (*INC8) String 

func (i *INC8) String() string

func (*INC8) TStates 

func (i *INC8) TStates(z *Zog) int

type Imm16 

type Imm16 uint16

func (Imm16) Read16 

func (nn Imm16) Read16(z *Zog) (uint16, error)

func (Imm16) String 

func (nn Imm16) String() string

func (Imm16) Write16 

func (nn Imm16) Write16(z *Zog, n uint16) error

type Imm8 

type Imm8 byte

func (Imm8) Read8 

func (n Imm8) Read8(z *Zog) (byte, error)

func (Imm8) String 

func (n Imm8) String() string

func (Imm8) Write8 

func (n Imm8) Write8(z *Zog, tmp byte) error

type IndexedContents 

type IndexedContents struct {
	// contains filtered or unexported fields
}

func (IndexedContents) Read16 

func (ic IndexedContents) Read16(z *Zog) (uint16, error)

func (IndexedContents) Read8 

func (ic IndexedContents) Read8(z *Zog) (byte, error)

func (IndexedContents) String 

func (ic IndexedContents) String() string

func (IndexedContents) Write16 

func (ic IndexedContents) Write16(z *Zog, nn uint16) error

func (IndexedContents) Write8 

func (ic IndexedContents) Write8(z *Zog, n byte) error

type InstBin16 

type InstBin16 struct {
	// contains filtered or unexported fields
}

func (*InstBin16) Resolve 

func (i *InstBin16) Resolve(a *Assembly) error

type InstBin8 

type InstBin8 struct {
	// contains filtered or unexported fields
}

func (*InstBin8) Resolve 

func (i *InstBin8) Resolve(a *Assembly) error

type InstU16 

type InstU16 struct {
	// contains filtered or unexported fields
}

func (*InstU16) Resolve 

func (i *InstU16) Resolve(a *Assembly) error

type InstU8 

type InstU8 struct {
	// contains filtered or unexported fields
}

func (*InstU8) Resolve 

func (i *InstU8) Resolve(a *Assembly) error

type Instruction 

type Instruction interface {
	String() string
	Encode() []byte
	Resolve(a *Assembly) error
	Execute(z *Zog) error
	TStates(z *Zog) int
}

func DecodeBytes 

func DecodeBytes(buf []byte) ([]Instruction, error)

func DecodeOne 

func DecodeOne(r io.Reader) (Instruction, error)

type InterruptState 

type InterruptState struct {
	IFF1 bool
	IFF2 bool
	Mode byte
}

type JP 

type JP struct {
	InstU16
	// contains filtered or unexported fields
}

func NewJP 

func NewJP(c Conditional, l Loc16) *JP

func (*JP) Encode 

func (jp *JP) Encode() []byte

func (*JP) Execute 

func (jp *JP) Execute(z *Zog) error

func (*JP) String 

func (jp *JP) String() string

func (*JP) TStates 

func (jp *JP) TStates(z *Zog) int

type JR 

type JR struct {
	// contains filtered or unexported fields
}

func (*JR) Encode 

func (j *JR) Encode() []byte

func (*JR) Execute 

func (j *JR) Execute(z *Zog) error

func (*JR) Resolve 

func (j *JR) Resolve(a *Assembly) error

func (*JR) String 

func (j *JR) String() string

func (*JR) TStates 

func (j *JR) TStates(z *Zog) int

type LD16 

type LD16 struct {
	InstBin16
}

func NewLD16 

func NewLD16(dst, src Loc16) *LD16

func (*LD16) Encode 

func (l *LD16) Encode() []byte

func (*LD16) Execute 

func (l *LD16) Execute(z *Zog) error

func (*LD16) String 

func (l *LD16) String() string

func (*LD16) TStates 

func (i *LD16) TStates(z *Zog) int

type LD8 

type LD8 struct {
	InstBin8
}

func NewLD8 

func NewLD8(dst Loc8, src Loc8) *LD8

func (*LD8) Encode 

func (l *LD8) Encode() []byte

func (*LD8) Execute 

func (l *LD8) Execute(z *Zog) error

func (*LD8) String 

func (l *LD8) String() string

func (*LD8) TStates 

func (i *LD8) TStates(z *Zog) int

type Label 

type Label struct {
	// Default to the zero value because we need to encode
	// this location *before* it is resolved with an address
	// so that we can calculate instruction length.
	// See assemble/ResolveAddr
	Imm16
	// contains filtered or unexported fields
}

func (Label) String 

func (l Label) String() string

type LabelHolder 

type LabelHolder struct{}

func (*LabelHolder) Encode 

func (lh *LabelHolder) Encode() []byte

func (*LabelHolder) Execute 

func (lh *LabelHolder) Execute(z *Zog) error

func (*LabelHolder) Resolve 

func (lh *LabelHolder) Resolve(a *Assembly) error

func (*LabelHolder) String 

func (lh *LabelHolder) String() string

func (*LabelHolder) TStates 

func (lh *LabelHolder) TStates(z *Zog) int

type LabelledInstruction 

type LabelledInstruction struct {
	Label string
	Inst  Instruction
	Addr  uint16
}

type Loc 

type Loc interface {
	Read8(z *Zog) (byte, error)
	Write8(z *Zog, n byte) error
	Read16(z *Zog) (uint16, error)
	Write16(z *Zog, nn uint16) error
	String() string
}

(HL), (BC), (SP) could refer to a byte addr or a word addr

type Loc16 

type Loc16 interface {
	Read16(z *Zog) (uint16, error)
	Write16(z *Zog, nn uint16) error
	String() string
}

type Loc8 

type Loc8 interface {
	Read8(z *Zog) (byte, error)
	Write8(z *Zog, n byte) error
	String() string
}

type Machine 

type Machine interface {
	LoadAddr() uint16
	RunAddr() uint16
	Name() string
	Start() error
	Stop()
	RegisterCallbacks()
}

type Memory 

type Memory struct {
	sync.Mutex
	// contains filtered or unexported fields
}

func NewMemory 

func NewMemory(size uint16) *Memory

func (*Memory) Clear 

func (m *Memory) Clear()

func (*Memory) Copy 

func (m *Memory) Copy(addr uint16, buf []byte) error

func (*Memory) Len 

func (m *Memory) Len() int

func (*Memory) Peek 

func (m *Memory) Peek(addr uint16) (byte, error)

func (*Memory) Peek16 

func (m *Memory) Peek16(addr uint16) (uint16, error)

func (*Memory) PeekBuf 

func (m *Memory) PeekBuf(addr uint16, size int) ([]byte, error)

Fetch a chunk of memory. Error if overflows end. Don't write to this please.

func (*Memory) Poke 

func (m *Memory) Poke(addr uint16, n byte) error

func (*Memory) Poke16 

func (m *Memory) Poke16(addr uint16, nn uint16) error

func (*Memory) SetDebug 

func (m *Memory) SetDebug(debug bool)

func (*Memory) SetWatchFunc 

func (m *Memory) SetWatchFunc(wf func(uint16, byte, byte))

type Not 

type Not struct {
	// contains filtered or unexported fields
}

func (Not) IsTrue 

func (n Not) IsTrue(z *Zog) bool

func (Not) String 

func (n Not) String() string

type OUT 

type OUT struct {
	// contains filtered or unexported fields
}

func (*OUT) Encode 

func (o *OUT) Encode() []byte

func (*OUT) Execute 

func (o *OUT) Execute(z *Zog) error

func (*OUT) Resolve 

func (o *OUT) Resolve(a *Assembly) error

func (*OUT) String 

func (o *OUT) String() string

func (*OUT) TStates 

func (o *OUT) TStates(z *Zog) int

type POP 

type POP struct {
	InstU16
}

func NewPOP 

func NewPOP(l Loc16) *POP

func (*POP) Encode 

func (p *POP) Encode() []byte

func (*POP) Execute 

func (p *POP) Execute(z *Zog) error

func (*POP) String 

func (p *POP) String() string

func (*POP) TStates 

func (p *POP) TStates(z *Zog) int

type PUSH 

type PUSH struct {
	InstU16
}

func NewPUSH 

func NewPUSH(l Loc16) *PUSH

func (*PUSH) Encode 

func (p *PUSH) Encode() []byte

func (*PUSH) Execute 

func (p *PUSH) Execute(z *Zog) error

func (*PUSH) String 

func (p *PUSH) String() string

func (*PUSH) TStates 

func (p *PUSH) TStates(z *Zog) int

type PegAssembler 

type PegAssembler struct {
	Current

	Buffer string

	Pretty bool
	// contains filtered or unexported fields
}

func (*PegAssembler) AST 

func (t *PegAssembler) AST() *node32

func (*PegAssembler) Add 

func (t *PegAssembler) Add(rule pegRule, begin, end, index uint32)

func (*PegAssembler) Execute 

func (p *PegAssembler) Execute()

func (*PegAssembler) Init 

func (p *PegAssembler) Init()

func (*PegAssembler) Parse 

func (p *PegAssembler) Parse(rule ...int) error

func (*PegAssembler) PrettyPrintSyntaxTree 

func (t *PegAssembler) PrettyPrintSyntaxTree(buffer string)

func (*PegAssembler) Print 

func (t *PegAssembler) Print()

func (*PegAssembler) PrintSyntaxTree 

func (p *PegAssembler) PrintSyntaxTree()

func (*PegAssembler) Reset 

func (p *PegAssembler) Reset()

func (*PegAssembler) Tokens 

func (t *PegAssembler) Tokens() []token32

func (*PegAssembler) Trim 

func (t *PegAssembler) Trim(length uint32)

type R16 

type R16 int
const (
	AF R16 = iota
	BC
	DE
	HL
	IX
	IY
	SP
	PC
	AF_PRIME
	BC_PRIME
	DE_PRIME
	HL_PRIME
)

func LookupR16Name 

func LookupR16Name(name string) R16

func (R16) Read16 

func (r R16) Read16(z *Zog) (uint16, error)

func (R16) String 

func (r R16) String() string

func (R16) Write16 

func (r R16) Write16(z *Zog, nn uint16) error

type R8 

type R8 int
const (
	A R8 = iota
	F
	B
	C
	D
	E
	H
	L
	IXL
	IXH
	IYL
	IYH
	I
	R
)

func LookupR8Name 

func LookupR8Name(name string) R8

func (R8) Read8 

func (r R8) Read8(z *Zog) (byte, error)

func (R8) String 

func (r R8) String() string

func (R8) Write8 

func (r R8) Write8(z *Zog, n byte) error

type RES 

type RES struct {
	InstU8
	// contains filtered or unexported fields
}

func NewRES 

func NewRES(num byte, l Loc8, cpy Loc8) *RES

func (*RES) Encode 

func (r *RES) Encode() []byte

func (*RES) Execute 

func (r *RES) Execute(z *Zog) error

func (*RES) String 

func (r *RES) String() string

func (*RES) TStates 

func (r *RES) TStates(z *Zog) int

type RET 

type RET struct {
	// contains filtered or unexported fields
}

func (*RET) Encode 

func (r *RET) Encode() []byte

func (*RET) Execute 

func (r *RET) Execute(z *Zog) error

func (*RET) Resolve 

func (r *RET) Resolve(a *Assembly) error

func (*RET) String 

func (r *RET) String() string

func (*RET) TStates 

func (r *RET) TStates(z *Zog) int

type RST 

type RST struct {
	// contains filtered or unexported fields
}

func (*RST) Encode 

func (r *RST) Encode() []byte

func (*RST) Execute 

func (r *RST) Execute(z *Zog) error

func (*RST) Resolve 

func (r *RST) Resolve(a *Assembly) error

func (*RST) String 

func (r *RST) String() string

func (*RST) TStates 

func (r *RST) TStates(z *Zog) int

type Region 

type Region struct {
	// contains filtered or unexported fields
}

func NewRegion 

func NewRegion(start, end uint16) Region

func (Region) String 

func (r Region) String() string

type Regions 

type Regions []Region

func ParseRegions 

func ParseRegions(s string) (Regions, error)

func (Regions) String 

func (rs Regions) String() string

type Registers 

type Registers struct {
	A, F byte
	B, C byte
	D, E byte
	H, L byte

	IXH, IXL byte
	IYH, IYL byte

	I, R byte

	// Alternate register set
	A_PRIME, F_PRIME byte
	B_PRIME, C_PRIME byte
	D_PRIME, E_PRIME byte
	H_PRIME, L_PRIME byte

	SP uint16
	PC uint16
}

func (*Registers) Read16 

func (r *Registers) Read16(l R16) uint16

func (*Registers) Read8 

func (r *Registers) Read8(l R8) byte

func (Registers) String 

func (r Registers) String() string

func (Registers) Summary 

func (r Registers) Summary() string

func (*Registers) Write16 

func (r *Registers) Write16(l R16, nn uint16)

func (*Registers) Write8 

func (r *Registers) Write8(l R8, n byte)

type RotInfo 

type RotInfo struct {
	// contains filtered or unexported fields
}

type SBC16 

type SBC16 struct {
	InstBin16
}

func NewSBC16 

func NewSBC16(dst, src Loc16) *SBC16

func (*SBC16) Encode 

func (s *SBC16) Encode() []byte

func (*SBC16) Execute 

func (s *SBC16) Execute(z *Zog) error

func (*SBC16) String 

func (s *SBC16) String() string

func (*SBC16) TStates 

func (s *SBC16) TStates(z *Zog) int

type SET 

type SET struct {
	InstU8
	// contains filtered or unexported fields
}

func NewSET 

func NewSET(num byte, l Loc8, cpy Loc8) *SET

func (*SET) Encode 

func (s *SET) Encode() []byte

func (*SET) Execute 

func (s *SET) Execute(z *Zog) error

func (*SET) String 

func (s *SET) String() string

func (*SET) TStates 

func (s *SET) TStates(z *Zog) int

type Simple 

type Simple byte
const (
	NOP Simple = 0x00

	HALT Simple = 0x76

	RLCA Simple = 0x07
	RRCA Simple = 0x0f
	RLA  Simple = 0x17
	RRA  Simple = 0x1f
	DAA  Simple = 0x27
	CPL  Simple = 0x2f
	SCF  Simple = 0x37
	CCF  Simple = 0x3f

	EXX Simple = 0xd9

	DI Simple = 0xf3
	EI Simple = 0xfb
)

func LookupSimpleName 

func LookupSimpleName(name string) Simple

func (Simple) Encode 

func (s Simple) Encode() []byte

func (Simple) Execute 

func (s Simple) Execute(z *Zog) error

func (Simple) Resolve 

func (s Simple) Resolve(a *Assembly) error

func (Simple) String 

func (s Simple) String() string

func (Simple) TStates 

func (s Simple) TStates(z *Zog) int

type TrueLogicConstant 

type TrueLogicConstant struct{}
var True TrueLogicConstant

func (TrueLogicConstant) IsTrue 

func (l TrueLogicConstant) IsTrue(z *Zog) bool

func (TrueLogicConstant) String 

func (l TrueLogicConstant) String() string

type Zog 

type Zog struct {
	Mem *Memory
	// contains filtered or unexported fields
}

func New 

func New(memSize uint16) *Zog

func (*Zog) Clear 

func (z *Zog) Clear()

func (*Zog) DoInterrupt 

func (z *Zog) DoInterrupt()

func (*Zog) FlagString 

func (z *Zog) FlagString() string

func (*Zog) GetFlag 

func (z *Zog) GetFlag(f flag) bool

func (*Zog) GetRegisters 

func (z *Zog) GetRegisters() Registers

func (*Zog) InterruptEnabled 

func (z *Zog) InterruptEnabled() bool

func (*Zog) Load 

func (z *Zog) Load(a *Assembly) error

func (*Zog) LoadBytes 

func (z *Zog) LoadBytes(addr uint16, buf []byte) error

func (*Zog) LoadFile 

func (z *Zog) LoadFile(addr uint16, fname string, readonly bool) error

func (*Zog) LoadInterruptState 

func (z *Zog) LoadInterruptState(is InterruptState)

func (*Zog) LoadROMFile 

func (z *Zog) LoadROMFile(addr uint16, fname string) error

func (*Zog) LoadRegisters 

func (z *Zog) LoadRegisters(reg Registers)

func (*Zog) Read 

func (z *Zog) Read(buf []byte) (int, error)

Implement io.Reader

func (*Zog) RegisterInputHandler 

func (z *Zog) RegisterInputHandler(handler func(uint16) byte) error

func (*Zog) RegisterOutputHandler 

func (z *Zog) RegisterOutputHandler(handler func(uint16, byte)) error

func (*Zog) Run 

func (z *Zog) Run() (errRet error)

func (*Zog) RunAssembly 

func (z *Zog) RunAssembly(a *Assembly) error

func (*Zog) RunBytes 

func (z *Zog) RunBytes(loadAddr uint16, buf []byte, runAddr uint16) error

func (*Zog) SetFlag 

func (z *Zog) SetFlag(f flag, new bool)

func (*Zog) State 

func (z *Zog) State() string

func (*Zog) TraceOnHalt 

func (z *Zog) TraceOnHalt(numHaltTraces int)

func (*Zog) TraceRegions 

func (z *Zog) TraceRegions(regions Regions) error

func (*Zog) WatchRegions 

func (z *Zog) WatchRegions(regions Regions) error

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