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c6502.rb
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c6502.rb
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#
# 6502 assembler
#
#
#
require "./assembler"
module Assembler
class C6502 < Assembler
def decode_number (string)
match("$[0-9A-F]+").as(:hex) >> (str(".w"))
/$[0-9A-F]+\.B/i
/[0-9]+/i
end
ARGUMENT_READERS = {
"x" => {parse: value,
emit: -> asm, str { asm.decode_number(str).to_i.if_within(-128, 255) }},
"?" => {parse: value,
emit: asm, str { asm.decode_number(str).to_i.if_within(-32768, 65535) }},
}
OPCODE_TYPES = [
none: -> asm, bytecode, tokens { asm.db bytecode },
bkpt: -> asm, bytecode, tokens { asm.breakpoint; asm.db bytecode },
imm: -> asm, bytecode, tokens { asm.db bytecode, tokens[0].b }
bkpi: -> asm, bytecode, tokens { asm.breakpoint; asm.db bytecode, tokens[0].b }
addr: -> asm, bytecode, tokens { asm.db bytecode, tokens[0].lo_byte, tokens[0].hi_byte },
rel: -> asm, bytecode, tokens { asm.db bytecode, tokens[0].relative_to(asm.here).b },
bbit: -> asm, bytecode, tokens { asm.db bytecode, tokens[0].b, tokens[1].b }
]
# adapted from the WLA-DX 6502 tables
INSN_TABLE_6502 = [
[[ "ADC #x", 0x69, :imm ]],
[[ "ADC (x,X)", 0x61, :imm ]],
[[ "ADC (x),Y", 0x71, :imm ]],
[[ "ADC (x)", 0x72, :imm ]],
[[ "ADC x,X", 0x75, :imm ],
[ "ADC ?,X", 0x7D, :addr]],
[[ "ADC ?,Y", 0x79, :addr]],
[[ "ADC x", 0x65, :imm ],
[ "ADC ?", 0x6D, :addr]],
[[ "ADC.B #x", 0x69, :imm ]],
[[ "ADC.B (x,X)", 0x61, :imm ]],
[[ "ADC.B (x),Y", 0x71, :imm ]],
[[ "ADC.B (x)", 0x72, :imm ]],
[[ "ADC.B x,X", 0x75, :imm ]],
[[ "ADC.W ?,X", 0x7D, :addr]],
[[ "ADC.W ?,Y", 0x79, :addr]],
[[ "ADC.B x", 0x65, :imm ]],
[[ "ADC.W ?", 0x6D, :addr]],
[[ "AND #x", 0x29, :imm ]],
[[ "AND (x,X)", 0x21, :imm ]],
[[ "AND (x),Y", 0x31, :imm ]],
[[ "AND (x)", 0x32, :imm ]],
[[ "AND x,X", 0x35, :imm ],
[ "AND ?,X", 0x3D, :addr]],
[[ "AND ?,Y", 0x39, :addr]],
[[ "AND x", 0x25, :imm ],
[ "AND ?", 0x2D, :addr]],
[[ "AND.B #x", 0x29, :imm ]],
[[ "AND.B (x,X)", 0x21, :imm ]],
[[ "AND.B (x),Y", 0x31, :imm ]],
[[ "AND.B (x)", 0x32, :imm ]],
[[ "AND.B x,X", 0x35, :imm ]],
[[ "AND.W ?,X", 0x3D, :addr]],
[[ "AND.W ?,Y", 0x39, :addr]],
[[ "AND.B x", 0x25, :imm ]],
[[ "AND.W ?", 0x2D, :addr]],
[[ "ASL A", 0x0A, :none]],
[[ "ASL x,X", 0x16, :imm ],
[ "ASL ?,X", 0x1E, :addr]],
[[ "ASL x", 0x06, :imm ],
[ "ASL ?", 0x0E, :addr]],
[[ "ASL.B x,X", 0x16, :imm ]],
[[ "ASL.W ?,X", 0x1E, :addr]],
[[ "ASL.B x", 0x06, :imm ]],
[[ "ASL.W ?", 0x0E, :addr]],
[[ "ASL", 0x0A, :none]],
[[ "BCC x", 0x90, :rel ]],
[[ "BCS x", 0xB0, :rel ]],
[[ "BEQ x", 0xF0, :rel ]],
[[ "BMI x", 0x30, :rel ]],
[[ "BNE x", 0xD0, :rel ]],
[[ "BPL x", 0x10, :rel ]],
[[ "BVC x", 0x50, :rel ]],
[[ "BVS x", 0x70, :rel ]],
[[ "BRA x", 0x80, :rel ]],
[[ "BCC.B x", 0x90, :rel ]],
[[ "BCS.B x", 0xB0, :rel ]],
[[ "BEQ.B x", 0xF0, :rel ]],
[[ "BMI.B x", 0x30, :rel ]],
[[ "BNE.B x", 0xD0, :rel ]],
[[ "BPL.B x", 0x10, :rel ]],
[[ "BVC.B x", 0x50, :rel ]],
[[ "BVS.B x", 0x70, :rel ]],
[[ "BRA.B x", 0x80, :rel ]],
[[ "BIT #x", 0x89, :imm ]],
[[ "BIT x,X", 0x34, :imm ],
[ "BIT ?,X", 0x3C, :addr]],
[[ "BIT x", 0x24, :imm ],
[ "BIT ?", 0x2C, :addr]],
[[ "BIT.B x,X", 0x34, :imm ],
[ "BIT.W ?,X", 0x3C, :addr]],
[[ "BIT.B x", 0x24, :imm ],
[ "BIT.W ?", 0x2C, :addr]],
[[ "BRK x", 0x00, :bkpi]],
[[ "BRK.B x", 0x00, :bkpi]],
[[ "BRK", 0x00, :bkpt]],
[[ "CLC", 0x18, :none]],
[[ "CLD", 0xD8, :none]],
[[ "CLI", 0x58, :none]],
[[ "CLV", 0xB8, :none]],
[[ "CMP #x", 0xC9, :imm ]],
[[ "CMP (x,X)", 0xC1, :imm ]],
[[ "CMP (x),Y", 0xD1, :imm ]],
[[ "CMP (x)", 0xD2, :imm ]],
[[ "CMP x,X", 0xD5, :imm ],
[ "CMP ?,X", 0xDD, :addr]],
[[ "CMP ?,Y", 0xD9, :addr]],
[[ "CMP x", 0xC5, :imm ],
[ "CMP ?", 0xCD, :addr]],
[[ "CMP.B #x", 0xC9, :imm ]],
[[ "CMP.B (x,X)", 0xC1, :imm ]],
[[ "CMP.B (x),Y", 0xD1, :imm ]],
[[ "CMP.B (x)", 0xD2, :imm ]],
[[ "CMP.B x,X", 0xD5, :imm ]],
[[ "CMP.W ?,X", 0xDD, :addr]],
[[ "CMP.W ?,Y", 0xD9, :addr]],
[[ "CMP.B x", 0xC5, :imm ]],
[[ "CMP.W ?", 0xCD, :addr]],
[[ "CPX #x", 0xE0, :imm ]],
[[ "CPX x", 0xE4, :imm ],
[ "CPX ?", 0xEC, :addr]],
[[ "CPX.B #x", 0xE0, :imm ]],
[[ "CPX.B x", 0xE4, :imm ]],
[[ "CPX.W ?", 0xEC, :addr]],
[[ "CPY #x", 0xC0, :imm ]],
[[ "CPY x", 0xC4, :imm ],
[ "CPY ?", 0xCC, :addr]],
[[ "CPY.B #x", 0xC0, :imm ]],
[[ "CPY.B x", 0xC4, :imm ]],
[[ "CPY.W ?", 0xCC, :addr]],
[[ "DEC x,X", 0xD6, :imm ],
[ "DEC ?,X", 0xDE, :addr]],
[[ "DEC x", 0xC6, :imm ],
[ "DEC ?", 0xCE, :addr]],
[[ "DEA", 0x3A, :none]],
[[ "DEX", 0xCA, :none]],
[[ "DEY", 0x88, :none]],
[[ "DEC.B x,X", 0xD6, :imm ]],
[[ "DEC.W ?,X", 0xDE, :addr]],
[[ "DEC.B x", 0xC6, :imm ]],
[[ "DEC.W ?", 0xCE, :addr]],
[[ "EOR #x", 0x49, :imm ]],
[[ "EOR (x,X)", 0x41, :imm ]],
[[ "EOR (x),Y", 0x51, :imm ]],
[[ "EOR (x)", 0x52, :imm ]],
[[ "EOR x,X", 0x55, :imm ],
[ "EOR ?,X", 0x5D, :addr]],
[[ "EOR ?,Y", 0x59, :addr]],
[[ "EOR x", 0x45, :imm ],
[ "EOR ?", 0x4D, :addr]],
[[ "EOR.B #x", 0x49, :imm ]],
[[ "EOR.B (x,X)", 0x41, :imm ]],
[[ "EOR.B (x),Y", 0x51, :imm ]],
[[ "EOR.B (x)", 0x52, :imm ]],
[[ "EOR.B x,X", 0x55, :imm ]],
[[ "EOR.W ?,X", 0x5D, :addr]],
[[ "EOR.W ?,Y", 0x59, :addr]],
[[ "EOR.B x", 0x45, :imm ]],
[[ "EOR.W ?", 0x4D, :addr]],
[[ "INC x,X", 0xF6, :imm ],
[ "INC ?,X", 0xFE, :addr]],
[[ "INC x", 0xE6, :imm ],
[ "INC ?", 0xEE, :addr]],
[[ "INA", 0x1A, :none]],
[[ "INX", 0xE8, :none]],
[[ "INY", 0xC8, :none]],
[[ "INC.B x,X", 0xF6, :imm ]],
[[ "INC.W ?,X", 0xFE, :addr]],
[[ "INC.B x", 0xE6, :imm ]],
[[ "INC.W ?", 0xEE, :addr]],
[[ "JMP (?,X)", 0x7C, :addr]],
[[ "JMP (?)", 0x6C, :addr]],
[[ "JMP ?", 0x4C, :addr]],
[[ "JSR ?", 0x20, :addr]],
[[ "JMP.W (?,X)", 0x7C, :addr]],
[[ "JMP.W (?)", 0x6C, :addr]],
[[ "JMP.W ?", 0x4C, :addr]],
[[ "JSR.W ?", 0x20, :addr]],
[[ "LDA #x", 0xA9, :imm ]],
[[ "LDA (x,X)", 0xA1, :imm ]],
[[ "LDA (x),Y", 0xB1, :imm ]],
[[ "LDA (x)", 0xB2, :imm ]],
[[ "LDA x,X", 0xB5, :imm ],
[ "LDA ?,X", 0xBD, :addr]],
[[ "LDA ?,Y", 0xB9, :addr]],
[[ "LDA x", 0xA5, :imm ],
[ "LDA ?", 0xAD, :addr]],
[[ "LDA.B #x", 0xA9, :imm ]],
[[ "LDA.B (x,X)", 0xA1, :imm ]],
[[ "LDA.B (x),Y", 0xB1, :imm ]],
[[ "LDA.B (x)", 0xB2, :imm ]],
[[ "LDA.B x,X", 0xB5, :imm ]],
[[ "LDA.W ?,X", 0xBD, :addr]],
[[ "LDA.W ?,Y", 0xB9, :addr]],
[[ "LDA.B x", 0xA5, :imm ]],
[[ "LDA.W ?", 0xAD, :addr]],
[[ "LDX #x", 0xA2, :imm ]],
[[ "LDX x,Y", 0xB6, :imm ],
[ "LDX ?,Y", 0xBE, :addr]],
[[ "LDX x", 0xA6, :imm ],
[ "LDX ?", 0xAE, :addr]],
[[ "LDX.B #x", 0xA2, :imm ]],
[[ "LDX.B x,Y", 0xB6, :imm ]],
[[ "LDX.W ?,Y", 0xBE, :addr]],
[[ "LDX.B x", 0xA6, :imm ]],
[[ "LDX.W ?", 0xAE, :addr]],
[[ "LDY #x", 0xA0, :imm ]],
[[ "LDY x,X", 0xB4, :imm ],
[ "LDY ?,X", 0xBC, :addr]],
[[ "LDY x", 0xA4, :imm ],
[ "LDY ?", 0xAC, :addr]],
[[ "LDY.B #x", 0xA0, :imm ]],
[[ "LDY.B x,X", 0xB4, :imm ]],
[[ "LDY.W ?,X", 0xBC, :addr]],
[[ "LDY.B x", 0xA4, :imm ]],
[[ "LDY.W ?", 0xAC, :addr]],
[[ "LSR A", 0x4A, :none]],
[[ "LSR x,X", 0x56, :imm ],
[ "LSR ?,X", 0x5E, :addr]],
[[ "LSR x", 0x46, :imm ],
[ "LSR ?", 0x4E, :addr]],
[[ "LSR.B x,X", 0x56, :imm ]],
[[ "LSR.W ?,X", 0x5E, :addr]],
[[ "LSR.B x", 0x46, :imm ]],
[[ "LSR.W ?", 0x4E, :addr]],
[[ "LSR", 0x4A, :none]],
[[ "NOP", 0xEA, :none]],
[[ "ORA #x", 0x09, :imm ]],
[[ "ORA (x,X)", 0x01, :imm ]],
[[ "ORA (x),Y", 0x11, :imm ]],
[[ "ORA (x)", 0x12, :imm ]],
[[ "ORA x,X", 0x15, :imm ],
[ "ORA ?,X", 0x1D, :addr]],
[[ "ORA ?,Y", 0x19, :addr]],
[[ "ORA x", 0x05, :imm ],
[ "ORA ?", 0x0D, :addr]],
[[ "ORA.B #x", 0x09, :imm ]],
[[ "ORA.B (x,X)", 0x01, :imm ]],
[[ "ORA.B (x),Y", 0x11, :imm ]],
[[ "ORA.B (x)", 0x12, :imm ]],
[[ "ORA.B x,X", 0x15, :imm ]],
[[ "ORA.W ?,X", 0x1D, :addr]],
[[ "ORA.W ?,Y", 0x19, :addr]],
[[ "ORA.B x", 0x05, :imm ]],
[[ "ORA.W ?", 0x0D, :addr]],
[[ "PHA", 0x48, :none]],
[[ "PHP", 0x08, :none]],
[[ "PHX", 0xDA, :none]],
[[ "PHY", 0x5A, :none]],
[[ "PLA", 0x68, :none]],
[[ "PLP", 0x28, :none]],
[[ "PLX", 0xFA, :none]],
[[ "PLY", 0x7A, :none]],
[[ "ROL A", 0x2A, :none]],
[[ "ROL x,X", 0x36, :imm ],
[ "ROL ?,X", 0x3E, :addr]],
[[ "ROL x", 0x26, :imm ],
[ "ROL ?", 0x2E, :addr]],
[[ "ROL.B x,X", 0x36, :imm ]],
[[ "ROL.W ?,X", 0x3E, :addr]],
[[ "ROL.B x", 0x26, :imm ]],
[[ "ROL.W ?", 0x2E, :addr]],
[[ "ROL", 0x2A, :none]],
[[ "ROR A", 0x6A, :none]],
[[ "ROR x,X", 0x76, :imm ],
[ "ROR ?,X", 0x7E, :addr]],
[[ "ROR x", 0x66, :imm ],
[ "ROR ?", 0x6E, :addr]],
[[ "ROR.B x,X", 0x76, :imm ]],
[[ "ROR.W ?,X", 0x7E, :addr]],
[[ "ROR.B x", 0x66, :imm ]],
[[ "ROR.W ?", 0x6E, :addr]],
[[ "ROR", 0x6A, :none]],
[[ "RTI", 0x40, :none]],
[[ "RTS", 0x60, :none]],
[[ "SBC #x", 0xE9, :imm ]],
[[ "SBC (x,X)", 0xE1, :imm ]],
[[ "SBC (x),Y", 0xF1, :imm ]],
[[ "SBC (x)", 0xF2, :imm ]],
[[ "SBC x,X", 0xF5, :imm ],
[ "SBC ?,X", 0xFD, :addr]],
[[ "SBC ?,Y", 0xF9, :addr]],
[[ "SBC x", 0xE5, :imm ],
[ "SBC ?", 0xED, :addr]],
[[ "SBC.B #x", 0xE9, :imm ]],
[[ "SBC.B (x,X)", 0xE1, :imm ]],
[[ "SBC.B (x),Y", 0xF1, :imm ]],
[[ "SBC.B (x)", 0xF2, :imm ]],
[[ "SBC.B x,X", 0xF5, :imm ]],
[[ "SBC.W ?,X", 0xFD, :addr]],
[[ "SBC.W ?,Y", 0xF9, :addr]],
[[ "SBC.B x", 0xE5, :imm ]],
[[ "SBC.W ?", 0xED, :addr]],
[[ "SEC", 0x38, :none]],
[[ "SED", 0xF8, :none]],
[[ "SEI", 0x78, :none]],
[[ "STA (x,X)", 0x81, :imm ]],
[[ "STA (x),Y", 0x91, :imm ]],
[[ "STA (x)", 0x92, :imm ]],
[[ "STA x,X", 0x95, :imm ],
[ "STA ?,X", 0x9D, :addr]],
[[ "STA ?,Y", 0x99, :addr]],
[[ "STA x", 0x85, :imm ],
[ "STA ?", 0x8D, :addr]],
[[ "STA.B (x,X)", 0x81, :imm ]],
[[ "STA.B (x),Y", 0x91, :imm ]],
[[ "STA.B (x)", 0x92, :imm ]],
[[ "STA.B x,X", 0x95, :imm ]],
[[ "STA.W ?,X", 0x9D, :addr]],
[[ "STA.W ?,Y", 0x99, :addr]],
[[ "STA.B x", 0x85, :imm ]],
[[ "STA.W ?", 0x8D, :addr]],
[[ "STX x,Y", 0x96, :imm ]],
[[ "STX x", 0x86, :imm ],
[ "STX ?", 0x8E, :addr]],
[[ "STX.B x,Y", 0x96, :imm ]],
[[ "STX.B x", 0x86, :imm ]],
[[ "STX.W ?", 0x8E, :addr]],
[[ "STY x,X", 0x94, :imm ]],
[[ "STY x", 0x84, :imm ],
[ "STY ?", 0x8C, :addr]],
[[ "STY.B x,X", 0x94, :imm ]],
[[ "STY.B x", 0x84, :imm ]],
[[ "STY.W ?", 0x8C, :addr]],
[[ "STZ x,X", 0x74, :imm ],
[ "STZ ?,X", 0x9E, :addr]],
[[ "STZ x", 0x64, :imm ],
[ "STZ ?", 0x9C, :addr]],
[[ "STZ.B x,X", 0x74, :imm ]],
[[ "STZ.W x,X", 0x94, :addr]],
[[ "STZ.B x", 0x64, :imm ]],
[[ "STZ.W ?", 0x9C, :addr]],
[[ "TAX", 0xAA, :none]],
[[ "TAY", 0xA8, :none]],
[[ "TSX", 0xBA, :none]],
[[ "TXA", 0x8A, :none]],
[[ "TXS", 0x9A, :none]],
[[ "TYA", 0x98, :none]],
[[ "TRB x", 0x14, :imm ],
[ "TRB ?", 0x1C, :addr]],
[[ "TRB.B x", 0x14, :imm ],
[ "TRB.W ?", 0x1C, :addr]],
[[ "TSB x", 0x04, :imm ],
[ "TSB ?", 0x0C, :addr]],
[[ "TSB.B x", 0x04, :imm ],
[ "TSB.W ?", 0x0C, :addr]]
]
OPCODE_TABLE_65C02 = OPCODE_TABLE_6502.insert(0,
[[ "BBR0 x,x", 0x0F, :bbit]],
[[ "BBR1 x,x", 0x1F, :bbit]],
[[ "BBR2 x,x", 0x2F, :bbit]],
[[ "BBR3 x,x", 0x3F, :bbit]],
[[ "BBR4 x,x", 0x4F, :bbit]],
[[ "BBR5 x,x", 0x5F, :bbit]],
[[ "BBR6 x,x", 0x6F, :bbit]],
[[ "BBR7 x,x", 0x7F, :bbit]],
[[ "BBS0 x,x", 0x8F, :bbit]],
[[ "BBS1 x,x", 0x9F, :bbit]],
[[ "BBS2 x,x", 0xAF, :bbit]],
[[ "BBS3 x,x", 0xBF, :bbit]],
[[ "BBS4 x,x", 0xCF, :bbit]],
[[ "BBS5 x,x", 0xDF, :bbit]],
[[ "BBS6 x,x", 0xEF, :bbit]],
[[ "BBS7 x,x", 0xFF, :bbit]],
[[ "RMB0 x", 0x07, :imm ]],
[[ "RMB1 x", 0x17, :imm ]],
[[ "RMB2 x", 0x27, :imm ]],
[[ "RMB3 x", 0x37, :imm ]],
[[ "RMB4 x", 0x47, :imm ]],
[[ "RMB5 x", 0x57, :imm ]],
[[ "RMB6 x", 0x67, :imm ]],
[[ "RMB7 x", 0x77, :imm ]],
[[ "SMB0 x", 0x87, :imm ]],
[[ "SMB1 x", 0x97, :imm ]],
[[ "SMB2 x", 0xA7, :imm ]],
[[ "SMB3 x", 0xB7, :imm ]],
[[ "SMB4 x", 0xC7, :imm ]],
[[ "SMB5 x", 0xD7, :imm ]],
[[ "SMB6 x", 0xE7, :imm ]],
[[ "SMB7 x", 0xF7, :imm ]]
)
end
end