Documentation
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Overview ¶
Package instructions defines the table of instruction for the 6507. The Definition type is used to summarise the requirements and effects of each entry in the table.
The table is generated programatically by the generator sub-package.
Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type AddressingMode ¶
type AddressingMode int
AddressingMode describes the method data for the instruction should be received.
const ( Implied AddressingMode = iota Immediate Relative // relative addressing is used for branch instructions Absolute // abs ZeroPage // zpg Indirect // ind IndexedIndirect // (ind,X) IndirectIndexed // (ind), Y AbsoluteIndexedX // abs,X AbsoluteIndexedY // abs,Y ZeroPageIndexedX // zpg,X ZeroPageIndexedY // zpg,Y )
List of supported addressing modes.
func (AddressingMode) String ¶ added in v0.10.1
func (m AddressingMode) String() string
type Cycles ¶ added in v0.16.0
Cycles is the number of cycles for the instruction. The Formatted value is the Value field formatted as a string with the condition that branch instructions are formatted as:
Value/Value+1
We do not format any potential PageSensitive cycle.
type Definition ¶
type Definition struct {
OpCode uint8
Operator Operator
Bytes int
Cycles Cycles
AddressingMode AddressingMode
PageSensitive bool
Effect EffectCategory
// Whether instruction is "undocumented".
Undocumented bool
}
Definition defines each instruction in the instruction set; one per instruction.
func GetDefinitions ¶
func GetDefinitions() []*Definition
GetDefinitions returns the table of instruction definitions for the 6507
func (Definition) IsBranch ¶
func (defn Definition) IsBranch() bool
IsBranch returns true if instruction is a branch instruction.
func (Definition) String ¶
func (defn Definition) String() string
String returns a single instruction definition as a string.
type EffectCategory ¶
type EffectCategory int
EffectCategory categorises an instruction by the effect it has.
const ( Read EffectCategory = iota Write RMW // flow consists of the Branch and JMP instructions. Branch instructions // specifically can be distinguished by the AddressingMode. Flow Subroutine Interrupt )
List of effect categories.
type Operator ¶ added in v0.19.0
type Operator int
Operator defines which operation is performed by the opcode. Many opcodes can perform the same operation.
const ( Nop Operator = iota Adc AHX ANC And ARR Asl ASR AXS Bcc Bcs Beq Bit Bmi Bne Bpl Brk Bvc Bvs Clc Cld Cli Clv Cmp Cpx Cpy DCP Dec Dex Dey Eor Inc Inx Iny ISC Jmp Jsr KIL LAS LAX Lda Ldx Ldy Lsr NOP Ora Pha Php Pla Plp RLA Rol Ror RRA Rti Rts SAX Sbc SBC Sec Sed Sei SHX SHY SLO SRE Sta Stx Sty TAS Tax Tay Tsx Txa Txs Tya XAA )
List of valid Operator values.
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