; BYTE      name length
; n BYTES   name
; BYTE      opcode template (variable parts zero)
;
; BYTE      operand 1
; BYTE      operand 2

; operand types:
; 0x00      none
; 0x1n      reg8, opcode |= (reg8 << n)
; 0x2n      reg16, opcode |= (reg8 << n)
; 0x3n      reg16b, opcode |= (reg8 << n)
; 0x7n      3-bit number, opcode |= (num << n)
; 0x80      imm8, encoded as extra byte
; 0x81      imm16, encoded as extra word

registers:
.reg8:
  db "B", 0
  db "C", 0
  db "D", 0
  db "E", 0
  db "H", 0
  db "L", 0
  db "M", 0
  db 0
.reg16:
  db "BC", 0
  db "DE", 0
  db "HL", 0
  db "SP", 0
  db 0
.reg16b:
  db "BC", 0
  db "DE", 0
  db "HL", 0
  db "AF", 0
  db 0
.end:
  db 0

opcodes:
  ; Data movement
  db 3, "MOV",  0b01000000, 0x13, 0x10
  db 3, "MVI",  0b00000110, 0x13, 0x80
  db 3, "LXI",  0b00000001, 0x24, 0x81
  db 3, "LDA",  0b00111010, 0x81, 0x00
  db 3, "STA",  0b00110010, 0x81, 0x00
  db 4, "LHLD", 0b00101010, 0x81, 0x00
  db 4, "SHLD", 0b00100010, 0x81, 0x00
  db 4, "LDAX", 0b00001010, 0x24, 0x00
  db 4, "STAX", 0b00000010, 0x24, 0x00
  db 4, "XCHG", 0b11101011, 0x00, 0x00

  ; Addition / Subtraction
  db 3, "ADD",  0b10000000, 0x10, 0x00
  db 3, "ADI",  0b11000110, 0x80, 0x00
  db 3, "ADC",  0b10001000, 0x10, 0x00
  db 3, "ACI",  0b11001110, 0x80, 0x00
  db 3, "SUB",  0b10010000, 0x10, 0x00
  db 3, "SUI",  0b11010110, 0x80, 0x00
  db 3, "SBB",  0b10011000, 0x10, 0x00
  db 3, "SBI",  0b11011110, 0x80, 0x00
  db 3, "INR",  0b00000100, 0x13, 0x00
  db 3, "DCR",  0b00000101, 0x13, 0x00
  db 3, "INX",  0b00000011, 0x24, 0x00
  db 3, "DCX",  0b00001011, 0x24, 0x00
  db 3, "DAD",  0b00001001, 0x24, 0x00

  ; BCD
  db 3, "DAA",  0b00100111, 0x00, 0x00

  ; Bitwise operations
  db 3, "ANA",  0b10100000, 0x10, 0x00
  db 3, "ANI",  0b11100110, 0x80, 0x00
  db 3, "ORA",  0b10110000, 0x10, 0x00
  db 3, "ORI",  0b11110110, 0x80, 0x00
  db 3, "XRA",  0b10101000, 0x10, 0x00
  db 3, "XRI",  0b11101110, 0x80, 0x00
  db 3, "CMP",  0b10111000, 0x10, 0x00
  db 3, "CPI",  0b11111110, 0x80, 0x00

  ; Rotate
  db 3, "RLC",  0b00000111, 0x00, 0x00
  db 3, "RRC",  0b00001111, 0x00, 0x00
  db 3, "RAL",  0b00010111, 0x00, 0x00
  db 3, "RAR",  0b00011111, 0x00, 0x00

  ; Complement
  db 3, "CMA",  0b00101111, 0x00, 0x00
  db 3, "CMC",  0b00111111, 0x00, 0x00
  db 3, "STC",  0b00110111, 0x00, 0x00

  ; Jump
  db 3, "JMP",  0b11000011, 0x81, 0x00
  db 3, "JNZ",  0b11000010, 0x81, 0x00
  db 2, "JZ",   0b11001010, 0x81, 0x00
  db 3, "JNC",  0b11010010, 0x81, 0x00
  db 2, "JC",   0b11011010, 0x81, 0x00
  db 3, "JPO",  0b11100010, 0x81, 0x00
  db 3, "JPE",  0b11101010, 0x81, 0x00
  db 2, "JP",   0b11110010, 0x81, 0x00
  db 2, "JM",   0b11111010, 0x81, 0x00

  ; Call
  db 4, "CALL", 0b11001101, 0x81, 0x00
  db 3, "CNZ",  0b11000100, 0x81, 0x00
  db 2, "CZ",   0b11001100, 0x81, 0x00
  db 3, "CNC",  0b11010100, 0x81, 0x00
  db 2, "CC",   0b11011100, 0x81, 0x00
  db 3, "CPO",  0b11100100, 0x81, 0x00
  db 3, "CPE",  0b11101100, 0x81, 0x00
  db 2, "CP",   0b11110100, 0x81, 0x00
  db 2, "CM",   0b11111100, 0x81, 0x00

  ; Return
  db 3, "RET",  0b11001001, 0x00, 0x00
  db 3, "RNZ",  0b11000000, 0x00, 0x00
  db 2, "RZ",   0b11001000, 0x00, 0x00
  db 3, "RNC",  0b11010000, 0x00, 0x00
  db 2, "RC",   0b11011000, 0x00, 0x00
  db 3, "RPO",  0b11100000, 0x00, 0x00
  db 3, "RPE",  0b11101000, 0x00, 0x00
  db 2, "RP",   0b11110000, 0x00, 0x00
  db 2, "RM",   0b11111000, 0x00, 0x00

  db 3, "RST",  0b11000111, 0x73, 0x00
  db 4, "PCHL", 0b11101001, 0x00, 0x00
  db 4, "PUSH", 0b11000101, 0x34, 0x00
  db 3, "POP",  0b11000001, 0x34, 0x00
  db 4, "XTHL", 0b11100011, 0x00, 0x00
  db 4, "SPHL", 0b11111001, 0x00, 0x00

  db 2, "IN",   0b11011011, 0x80, 0x00
  db 3, "OUT",  0b11010011, 0x80, 0x00

  db 2, "EI",   0b11111011, 0x00, 0x00
  db 2, "DI",   0b11110011, 0x00, 0x00
  db 3, "HLT",  0b01110110, 0x00, 0x00
  db 3, "NOP",  0b00000000, 0x00, 0x00

  db 0