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dpavlin |
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package ACME::6502; |
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dpavlin |
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use warnings FATAL => 'all'; |
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use strict; |
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use Carp; |
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dpavlin |
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use TieMem; |
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dpavlin |
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use Class::Std; |
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use version; our $VERSION = qv('0.0.6'); |
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# CPU flags |
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use constant { |
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N => 0x80, |
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V => 0x40, |
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R => 0x20, |
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B => 0x10, |
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D => 0x08, |
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I => 0x04, |
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Z => 0x02, |
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C => 0x01 |
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}; |
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use constant FLAGS => 'NVRBDIZC'; |
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# Other CPU constants |
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use constant { |
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STACK => 0x0100, |
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BREAK => 0xFFFE |
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}; |
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# Opcode to thunk into perlspace |
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use constant { |
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ESCAPE_OP => 0x0B, |
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ESCAPE_SIG => 0xAD |
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}; |
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my %cpu : ATTR; |
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dpavlin |
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=head2 BUILD |
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=head2 AUTOMETHOD |
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=cut |
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dpavlin |
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sub BUILD { |
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my ($self, $id, $args) = @_; |
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dpavlin |
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confess "no vram?" unless $args->{vram}; |
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my @mem; |
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my @ram = (0) x 65536; |
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tie @mem, 'TieMem', $args; |
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@ram = (); |
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dpavlin |
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my @os; |
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my ($a, $x, $y, $s, $p, $pc) = (0) x 6; |
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dpavlin |
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my $mmap; |
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dpavlin |
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# Page used to allocate vector thunks |
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my $jumptab = $args->{jumptab} || 0xFA00; |
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my $bad_inst = sub { |
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croak sprintf("Bad instruction at &%04x (&%02x)\n", |
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$pc - 1, $mem[$pc - 1]); |
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}; |
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my @zn = (Z, (0) x 127, (N) x 128); |
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my $inst = sub { |
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my $src = join("\n", @_); |
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my $cr = eval "sub { @_ }"; |
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confess "$@" if $@; |
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return $cr; |
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}; |
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my @decode = ( |
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$inst->( # 00 BRK |
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_push('($pc + 1) >> 8', '($pc + 1)'), |
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_push('$p | B'), |
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'$p = $p | I & ~D;', |
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_jmp_i(BREAK) |
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), |
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$inst->(_ora(_zpix())), # 01 ORA (zp, x) |
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$bad_inst, # 02 |
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$bad_inst, # 03 |
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$inst->(_tsb(_zp())), # 04 TSB zp |
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$inst->(_ora(_zp())), # 05 ORA zp |
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$inst->(_asl(_zp())), # 06 ASL zp |
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$bad_inst, # 07 |
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$inst->(_push('$p | R')), # 08 PHP |
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$inst->(_ora(_imm())), # 09 ORA #imm |
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$inst->(_asl(_acc())), # 0A ASL A |
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$bad_inst, # 0B |
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$inst->(_tsb(_abs())), # 0C TSB zp |
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$inst->(_ora(_abs())), # 0D ORA abs |
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$inst->(_asl(_abs())), # 0E ASL abs |
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$bad_inst, # 0F BBR0 rel |
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$inst->(_bfz(_rel(), N)), # 10 BPL rel |
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$inst->(_ora(_zpiy())), # 11 ORA (zp), y |
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$inst->(_ora(_zpi())), # 12 ORA (zp) |
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$bad_inst, # 13 |
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$inst->(_trb(_zpi())), # 14 TRB (zp) |
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$inst->(_ora(_zpx())), # 15 ORA zp, x |
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$inst->(_asl(_zpx())), # 16 ASL zp, x |
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$bad_inst, # 17 |
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$inst->('$p &= ~C;'), # 18 CLC |
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$inst->(_ora(_absy())), # 19 ORA abs, y |
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$inst->(_inc(_acc())), # 1A INC A |
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$bad_inst, # 1B |
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$inst->(_trb(_abs())), # 1C TRB abs |
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$inst->(_ora(_absx())), # 1D ORA abs, x |
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$inst->(_asl(_absx())), # 1E ASL abs, x |
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$bad_inst, # 1F BBR1 rel |
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$inst->( # 20 JSR |
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_push('($pc + 1) >> 8', '($pc + 1)'), |
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_jmp() |
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), |
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$inst->(_and(_zpix())), # 21 AND (zp, x) |
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$bad_inst, # 22 |
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$bad_inst, # 23 |
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$inst->(_bit(_zp())), # 24 BIT zp |
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$inst->(_and(_zp())), # 25 AND zp |
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$inst->(_rol(_zp())), # 26 ROL zp |
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$bad_inst, # 27 |
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$inst->(_pop_p()), # 28 PLP |
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$inst->(_and(_imm())), # 29 AND #imm |
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$inst->(_rol(_acc())), # 2A ROL A |
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$bad_inst, # 2B |
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$inst->(_bit(_abs())), # 2C BIT abs |
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$inst->(_and(_abs())), # 2D AND abs |
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$inst->(_rol(_abs())), # 2E ROL abs |
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$bad_inst, # 2F BBR2 rel |
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$inst->(_bfnz(_rel(), N)), # 30 BPL rel |
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$inst->(_and(_zpiy())), # 31 AND (zp), y |
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$inst->(_and(_zpi())), # 32 AND (zp) |
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$bad_inst, # 33 |
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$inst->(_bit(_zpx())), # 34 BIT zp, x |
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$inst->(_and(_zpx())), # 35 AND zp, x |
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$inst->(_rol(_zpx())), # 36 ROL zp, x |
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$bad_inst, # 37 |
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$inst->('$p |= C;'), # 38 SEC |
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$inst->(_and(_absy())), # 39 AND abs, y |
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$inst->(_dec(_acc())), # 3A DEC A |
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$bad_inst, # 3B |
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$inst->(_bit(_absx())), # 3C BIT abs, x |
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$inst->(_and(_absx())), # 3D AND abs, x |
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$inst->(_rol(_absx())), # 3E ROL abs, x |
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$bad_inst, # 3F BBR3 rel |
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$inst->(_pop('$p'), _rts()), # 40 RTI |
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$inst->(_eor(_zpix())), # 41 EOR (zp, x) |
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$bad_inst, # 42 |
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$bad_inst, # 43 |
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$bad_inst, # 44 |
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$inst->(_eor(_zp())), # 45 EOR zp |
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$inst->(_lsr(_zp())), # 46 LSR zp |
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$bad_inst, # 47 |
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$inst->(_push('$a')), # 48 PHA |
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$inst->(_eor(_imm())), # 49 EOR imm |
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$inst->(_lsr(_acc())), # 4A LSR A |
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$bad_inst, # 4B |
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$inst->(_jmp()), # 4C JMP abs |
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$inst->(_eor(_abs())), # 4D EOR abs |
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$inst->(_lsr(_abs())), # 4E LSR abs |
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$bad_inst, # 4F BBR4 rel |
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$inst->(_bfz(_rel(), V)), # 50 BVC rel |
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$inst->(_eor(_zpiy())), # 51 EOR (zp), y |
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$inst->(_eor(_zpi())), # 52 EOR (zp) |
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$bad_inst, # 53 |
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$bad_inst, # 54 |
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$inst->(_eor(_zpx())), # 55 EOR zp, x |
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$inst->(_lsr(_zpx())), # 56 LSR zp, x |
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$bad_inst, # 57 |
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$inst->('$p &= ~I;'), # 58 CLI |
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$inst->(_eor(_absy())), # 59 EOR abs, y |
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$inst->(_push('$y')), # 5A PHY |
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$bad_inst, # 5B |
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$bad_inst, # 5C |
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$inst->(_eor(_absx())), # 5D EOR abs, x |
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$inst->(_lsr(_absx())), # 5E LSR abs, x |
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$bad_inst, # 5F BBR5 rel |
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$inst->(_rts()), # 60 RTS |
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$inst->(_adc(_zpx())), # 61 ADC zp, x |
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$bad_inst, # 62 |
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$bad_inst, # 63 |
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$inst->(_sto(_zp(), '0')), # 64 STZ zp |
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$inst->(_adc(_zp())), # 65 ADC zp |
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$inst->(_ror(_zp())), # 66 ROR zp |
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$bad_inst, # 67 |
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$inst->(_pop('$a'), _status('$a')), # 68 PLA |
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$inst->(_adc(_imm())), # 69 ADC #imm |
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$inst->(_ror(_acc())), # 6A ROR A |
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$bad_inst, # 6B |
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$inst->(_jmpi()), # 6C JMP (abs) |
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$inst->(_adc(_abs())), # 6D ADC abs |
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$inst->(_ror(_abs())), # 6E ROR abs |
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$bad_inst, # 6F BBR6 rel |
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$inst->(_bfnz(_rel(), V)), # 70 BVS rel |
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$inst->(_adc(_zpiy())), # 71 ADC (zp), y |
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$inst->(_adc(_zpi())), # 72 ADC (zp) |
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$bad_inst, # 73 |
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$inst->(_sto(_zpx(), '0')), # 74 STZ zp, x |
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$inst->(_adc(_zpx())), # 75 ADC zp, x |
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$inst->(_adc(_zpx())), # 76 ROR zp, x |
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$bad_inst, # 77 |
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$inst->('$p |= I;'), # 78 STI |
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$inst->(_adc(_absy())), # 79 ADC abs, y |
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$inst->(_pop('$y'), _status('$y')), # 7A PLY |
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$bad_inst, # 7B |
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$inst->(_jmpix()), # 7C JMP (abs, x) |
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$inst->(_adc(_absx())), # 7D ADC abs, x |
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$inst->(_ror(_absx())), # 7E ROR abs, x |
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$bad_inst, # 7F BBR7 rel |
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$inst->(_bra(_rel())), # 80 BRA rel |
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$inst->(_sto(_zpix(), '$a')), # 81 STA (zp, x) |
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$bad_inst, # 82 |
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$bad_inst, # 83 |
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$inst->(_sto(_zp(), '$y')), # 84 STY zp |
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$inst->(_sto(_zp(), '$a')), # 85 STA zp |
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$inst->(_sto(_zp(), '$x')), # 86 STX zp |
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$bad_inst, # 87 |
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$inst->(_dec(('', '$y'))), # 88 DEY |
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$inst->(_bit(_imm())), # 89 BIT #imm |
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$inst->('$a = $x;' . _status('$a')), # 8A TXA |
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$bad_inst, # 8B |
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$inst->(_sto(_abs(), '$y')), # 8C STY abs |
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$inst->(_sto(_abs(), '$a')), # 8D STA abs |
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$inst->(_sto(_abs(), '$x')), # 8E STX abs |
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$bad_inst, # 8F BBS0 rel |
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$inst->(_bfz(_rel(), C)), # 90 BCC rel |
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$inst->(_sto(_zpiy(), '$a')), # 91 STA (zp), y |
| 232 |
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$inst->(_sto(_zpi(), '$a')), # 92 STA (zp) |
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$bad_inst, # 93 |
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$inst->(_sto(_zpx(), '$y')), # 94 STY zp, x |
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$inst->(_sto(_zpx(), '$a')), # 95 STA zp, x |
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$inst->(_sto(_zpy(), '$x')), # 96 STX zp, y |
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$bad_inst, # 97 |
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$inst->('$a = $y;' . _status('$a')), # 98 TYA |
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$inst->(_sto(_absy(), '$a')), # 99 STA abs, y |
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$inst->('$s = $x;'), # 9A TXS |
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$bad_inst, # 9B |
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$inst->(_sto(_abs(), '0')), # 9C STZ abs |
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$inst->(_sto(_absx(), '$a')), # 9D STA abs, x |
| 244 |
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$inst->(_sto(_absx(), '0')), # 9E STZ abs, x |
| 245 |
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$bad_inst, # 9F BBS1 rel |
| 246 |
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$inst->(_lod(_imm(), '$y')), # A0 LDY #imm |
| 247 |
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$inst->(_lod(_zpix(), '$a')), # A1 LDA (zp, x) |
| 248 |
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$inst->(_lod(_imm(), '$x')), # A2 LDX #imm |
| 249 |
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$bad_inst, # A3 |
| 250 |
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$inst->(_lod(_zp(), '$y')), # A4 LDY zp |
| 251 |
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$inst->(_lod(_zp(), '$a')), # A5 LDA zp |
| 252 |
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$inst->(_lod(_zp(), '$x')), # A6 LDX zp |
| 253 |
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$bad_inst, # A7 |
| 254 |
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$inst->('$y = $a;' . _status('$y')), # A8 TAY |
| 255 |
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$inst->(_lod(_imm(), '$a')), # A9 LDA #imm |
| 256 |
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$inst->('$x = $a;' . _status('$x')), # AA TAX |
| 257 |
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$bad_inst, # AB |
| 258 |
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$inst->(_lod(_abs(), '$y')), # AC LDY abs |
| 259 |
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$inst->(_lod(_abs(), '$a')), # AD LDA abs |
| 260 |
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$inst->(_lod(_abs(), '$x')), # AE LDX abs |
| 261 |
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$bad_inst, # AF BBS2 rel |
| 262 |
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$inst->(_bfnz(_rel(), C)), # B0 BCS rel |
| 263 |
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$inst->(_lod(_zpiy(), '$a')), # B1 LDA (zp), y |
| 264 |
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$inst->(_lod(_zpi(), '$a')), # B2 LDA (zp) |
| 265 |
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$bad_inst, # B3 |
| 266 |
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$inst->(_lod(_zpx(), '$y')), # B4 LDY zp, x |
| 267 |
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$inst->(_lod(_zpx(), '$a')), # B5 LDA zp, x |
| 268 |
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$inst->(_lod(_zpy(), '$x')), # B6 LDX zp, y |
| 269 |
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$bad_inst, # B7 |
| 270 |
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$inst->('$p &= ~V;'), # B8 CLV |
| 271 |
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$inst->(_lod(_absy(), '$a')), # B9 LDA abs, y |
| 272 |
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$inst->('$x = $s;'), # BA TSX |
| 273 |
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$bad_inst, # BB |
| 274 |
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$inst->(_lod(_absx(), '$y')), # BC LDY abs, x |
| 275 |
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$inst->(_lod(_absx(), '$a')), # BD LDA abs, x |
| 276 |
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$inst->(_lod(_absy(), '$x')), # BE LDX abs, y |
| 277 |
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$bad_inst, # BF BBS3 rel |
| 278 |
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$inst->(_cmp(_imm(), '$y')), # C0 CPY #imm |
| 279 |
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$inst->(_cmp(_zpix(), '$a')), # C1 CMP (zp, x) |
| 280 |
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$bad_inst, # C2 |
| 281 |
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$bad_inst, # C3 |
| 282 |
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$inst->(_cmp(_zp(), '$y')), # C4 CPY zp |
| 283 |
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$inst->(_cmp(_zp(), '$a')), # C5 CMP zp |
| 284 |
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$inst->(_dec(_zp())), # C6 DEC zp |
| 285 |
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$bad_inst, # C7 |
| 286 |
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$inst->(_inc(('', '$y'))), # C8 INY |
| 287 |
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$inst->(_cmp(_imm(), '$a')), # C9 CMP #imm |
| 288 |
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$inst->(_dec(('', '$x'))), # CA DEX |
| 289 |
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$bad_inst, # CB |
| 290 |
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$inst->(_cmp(_abs(), '$y')), # CC CPY abs |
| 291 |
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$inst->(_cmp(_abs(), '$a')), # CD CMP abs |
| 292 |
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$inst->(_dec(_abs())), # CE DEC abs |
| 293 |
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$bad_inst, # CF BBS4 rel |
| 294 |
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$inst->(_bfz(_rel(), Z)), # D0 BNE rel |
| 295 |
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$inst->(_cmp(_zpiy(), '$a')), # D1 CMP (zp), y |
| 296 |
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$inst->(_cmp(_zpi(), '$a')), # D2 CMP (zp) |
| 297 |
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$bad_inst, # D3 |
| 298 |
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$bad_inst, # D4 |
| 299 |
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$inst->(_cmp(_zpx(), '$a')), # D5 CMP zp, x |
| 300 |
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$inst->(_dec(_zpx())), # D6 DEC zp, x |
| 301 |
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$bad_inst, # D7 |
| 302 |
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$inst->('$p &= ~D;'), # D8 CLD |
| 303 |
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$inst->(_cmp(_absy(), '$a')), # D9 CMP abs, y |
| 304 |
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$inst->(_push('$x')), # DA PHX |
| 305 |
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$bad_inst, # DB |
| 306 |
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$bad_inst, # DC |
| 307 |
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$inst->(_cmp(_absx(), '$a')), # DD CMP abs, x |
| 308 |
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$inst->(_dec(_absx())), # DE DEC abs, x |
| 309 |
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$bad_inst, # DF BBS5 rel |
| 310 |
|
|
$inst->(_cmp(_imm(), '$x')), # E0 CPX #imm |
| 311 |
|
|
$inst->(_sbc(_zpix(), '$a')), # E1 SBC (zp, x) |
| 312 |
|
|
$bad_inst, # E2 |
| 313 |
|
|
$bad_inst, # E3 |
| 314 |
|
|
$inst->(_cmp(_zp(), '$x')), # E4 CPX zp |
| 315 |
|
|
$inst->(_sbc(_zp())), # E5 SBC zp |
| 316 |
|
|
$inst->(_inc(_zp())), # E6 INC zp |
| 317 |
|
|
$bad_inst, # E7 |
| 318 |
|
|
$inst->(_inc(('', '$x'))), # E8 INX |
| 319 |
|
|
$inst->(_sbc(_imm())), # E9 SBC #imm |
| 320 |
|
|
$inst->(), # EA NOP |
| 321 |
|
|
$bad_inst, # EB |
| 322 |
|
|
$inst->(_cmp(_abs(), '$x')), # EC CPX abs |
| 323 |
|
|
$inst->(_sbc(_abs())), # ED SBC abs |
| 324 |
|
|
$inst->(_inc(_abs())), # EE INC abs |
| 325 |
|
|
$bad_inst, # EF BBS6 rel |
| 326 |
|
|
$inst->(_bfnz(_rel(), Z)), # F0 BEQ rel |
| 327 |
|
|
$inst->(_sbc(_zpiy())), # F1 SBC (zp), y |
| 328 |
|
|
$inst->(_sbc(_zpi())), # F2 SBC (zp) |
| 329 |
|
|
$bad_inst, # F3 |
| 330 |
|
|
$bad_inst, # F4 |
| 331 |
|
|
$inst->(_sbc(_zpx())), # F5 SBC zp, x |
| 332 |
|
|
$inst->(_inc(_zpx())), # F6 INC zp, x |
| 333 |
|
|
$bad_inst, # F7 |
| 334 |
|
|
$inst->('$p |= D;'), # F8 SED |
| 335 |
|
|
$inst->(_sbc(_absy())), # F9 SBC abs, y |
| 336 |
|
|
$inst->(_pop('$x'), _status('$x')), # FA PLX |
| 337 |
|
|
$bad_inst, # FB |
| 338 |
|
|
$bad_inst, # FC |
| 339 |
|
|
$inst->(_sbc(_absx())), # FD SBC abs, x |
| 340 |
|
|
$inst->(_inc(_absx())), # FE INC abs, x |
| 341 |
|
|
$bad_inst # FF BBS7 rel |
| 342 |
|
|
); |
| 343 |
|
|
|
| 344 |
|
|
confess "Escape handler opcode not available" |
| 345 |
|
|
unless $decode[ESCAPE_OP] == $bad_inst; |
| 346 |
|
|
|
| 347 |
|
|
# Patch in the OS escape op handler |
| 348 |
|
|
$decode[ESCAPE_OP] = sub { |
| 349 |
|
|
if ($mem[$pc] != ESCAPE_SIG) { |
| 350 |
|
|
$bad_inst->(); |
| 351 |
|
|
} else { |
| 352 |
|
|
$pc += 2; |
| 353 |
|
|
$self->call_os($mem[$pc - 1]); |
| 354 |
|
|
} |
| 355 |
|
|
}; |
| 356 |
|
|
|
| 357 |
|
|
$cpu{$id} = { |
| 358 |
|
|
set_jumptab => sub { |
| 359 |
|
|
$jumptab = shift; |
| 360 |
|
|
}, |
| 361 |
|
|
|
| 362 |
|
|
read_str => sub { |
| 363 |
|
|
my $addr = shift; |
| 364 |
|
|
my $str = ''; |
| 365 |
|
|
while ($mem[$addr] != 0x0D) { |
| 366 |
|
|
$str .= chr($mem[$addr++]); |
| 367 |
|
|
} |
| 368 |
|
|
return $str; |
| 369 |
|
|
}, |
| 370 |
|
|
|
| 371 |
|
|
read_chunk => sub { |
| 372 |
|
|
my ($from, $to) = @_; |
| 373 |
|
|
return pack('C*', @mem[$from .. $to - 1]); |
| 374 |
|
|
}, |
| 375 |
|
|
|
| 376 |
|
|
write_chunk => sub { |
| 377 |
|
|
my ($addr, $chunk) = @_; |
| 378 |
|
|
my $len = length($chunk); |
| 379 |
|
|
splice @mem, $addr, $len, unpack('C*', $chunk); |
| 380 |
|
|
}, |
| 381 |
|
|
|
| 382 |
|
|
read_8 => sub { |
| 383 |
|
|
my $addr = shift; |
| 384 |
|
|
return $mem[$addr]; |
| 385 |
|
|
}, |
| 386 |
|
|
|
| 387 |
|
|
write_8 => sub { |
| 388 |
|
|
my ($addr, $val) = @_; |
| 389 |
|
|
$mem[$addr] = $val; |
| 390 |
|
|
}, |
| 391 |
|
|
|
| 392 |
|
|
read_16 => sub { |
| 393 |
|
|
my $addr = shift; |
| 394 |
|
|
return $mem[$addr] | ($mem[$addr + 1] << 8); |
| 395 |
|
|
}, |
| 396 |
|
|
|
| 397 |
|
|
write_16 => sub { |
| 398 |
|
|
my ($addr, $val) = @_; |
| 399 |
|
|
$mem[$addr + 0] = ($val >> 0) & 0xFF; |
| 400 |
|
|
$mem[$addr + 1] = ($val >> 8) & 0xFF; |
| 401 |
|
|
}, |
| 402 |
|
|
|
| 403 |
|
|
read_32 => sub { |
| 404 |
|
|
my $addr = shift; |
| 405 |
|
|
return $mem[$addr] | ($mem[$addr + 1] << 8) | |
| 406 |
|
|
($mem[$addr + 2] << 16) | ($mem[$addr + 3] << 32); |
| 407 |
|
|
}, |
| 408 |
|
|
|
| 409 |
|
|
write_32 => sub { |
| 410 |
|
|
my ($addr, $val) = @_; |
| 411 |
|
|
$mem[$addr + 0] = ($val >> 0) & 0xFF; |
| 412 |
|
|
$mem[$addr + 1] = ($val >> 8) & 0xFF; |
| 413 |
|
|
$mem[$addr + 2] = ($val >> 16) & 0xFF; |
| 414 |
|
|
$mem[$addr + 3] = ($val >> 24) & 0xFF; |
| 415 |
|
|
}, |
| 416 |
|
|
|
| 417 |
|
|
run => sub { |
| 418 |
|
|
my $ic = shift; |
| 419 |
|
|
my $cb = shift; |
| 420 |
|
|
if (defined($cb)) { |
| 421 |
|
|
while ($ic-- > 0) { |
| 422 |
|
|
$cb->($pc, $mem[$pc], $a, $x, $y, $s, $p); |
| 423 |
|
|
$decode[$mem[$pc++]]->(); |
| 424 |
dpavlin |
11 |
$pc &&= 0xffff; |
| 425 |
dpavlin |
3 |
} |
| 426 |
|
|
} else { |
| 427 |
|
|
while ($ic-- > 0) { |
| 428 |
dpavlin |
5 |
my $op = $mem[$pc]; |
| 429 |
|
|
# printf "pc: %04x %s\n", $pc, $op; |
| 430 |
|
|
$pc++; |
| 431 |
|
|
$decode[$op]->(); |
| 432 |
dpavlin |
3 |
} |
| 433 |
|
|
} |
| 434 |
|
|
}, |
| 435 |
|
|
|
| 436 |
|
|
load_rom => sub { |
| 437 |
|
|
my ($f, $a) = @_; |
| 438 |
|
|
open my $fh, '<', $f or croak "Can't read $f ($!)\n"; |
| 439 |
|
|
binmode $fh; |
| 440 |
|
|
my $sz = -s $fh; |
| 441 |
|
|
sysread $fh, my $buf, $sz |
| 442 |
|
|
or croak "Error reading $f ($!)\n"; |
| 443 |
dpavlin |
6 |
if ( $a < 0 ) { |
| 444 |
|
|
$buf = substr($buf, -$a); |
| 445 |
|
|
$a = 0; |
| 446 |
|
|
} |
| 447 |
dpavlin |
3 |
$self->write_chunk($a, $buf); |
| 448 |
|
|
}, |
| 449 |
|
|
|
| 450 |
|
|
poke_code => sub { |
| 451 |
|
|
my $addr = shift; |
| 452 |
|
|
$mem[$addr++] = $_ for @_; |
| 453 |
|
|
}, |
| 454 |
|
|
|
| 455 |
|
|
make_vector => sub { |
| 456 |
|
|
my ($call, $vec, $func) = @_; |
| 457 |
|
|
$mem[$call + 0] = 0x6C; # JMP (indirect) |
| 458 |
|
|
$mem[$call + 1] = $vec & 0xFF; |
| 459 |
|
|
$mem[$call + 2] = ($vec >> 8) & 0xFF; |
| 460 |
|
|
|
| 461 |
|
|
my $addr = $jumptab; |
| 462 |
|
|
$mem[$jumptab++] = ESCAPE_OP; |
| 463 |
|
|
$mem[$jumptab++] = ESCAPE_SIG; |
| 464 |
|
|
$mem[$jumptab++] = $func; |
| 465 |
|
|
$mem[$jumptab++] = 0x60; |
| 466 |
|
|
|
| 467 |
|
|
$mem[$vec + 0] = $addr & 0xFF; |
| 468 |
|
|
$mem[$vec + 1] = ($addr >> 8) & 0xFF; |
| 469 |
|
|
}, |
| 470 |
|
|
|
| 471 |
|
|
get_state => sub { |
| 472 |
|
|
return ($a, $x, $y, $s, $p, $pc); |
| 473 |
|
|
}, |
| 474 |
|
|
|
| 475 |
|
|
get_xy => sub { |
| 476 |
|
|
return $x || ($y << 8); |
| 477 |
|
|
}, |
| 478 |
|
|
|
| 479 |
|
|
set_xy => sub { |
| 480 |
|
|
my $v = shift; |
| 481 |
|
|
$x = $v & 0xFF; |
| 482 |
|
|
$y = ($v >> 8) & 0xFF; |
| 483 |
|
|
}, |
| 484 |
|
|
|
| 485 |
|
|
decode_flags => sub { |
| 486 |
|
|
my $f = shift; |
| 487 |
|
|
my $b = 0x80; |
| 488 |
|
|
my $n = FLAGS; |
| 489 |
|
|
my $desc = ''; |
| 490 |
|
|
while ($n) { |
| 491 |
|
|
$desc .= ($f & $b) ? substr($n, 0, 1) : '-'; |
| 492 |
|
|
$n = substr($n, 1); |
| 493 |
|
|
$b >>= 1; |
| 494 |
|
|
} |
| 495 |
|
|
return $desc; |
| 496 |
dpavlin |
5 |
}, |
| 497 |
|
|
|
| 498 |
|
|
mmap => sub { |
| 499 |
|
|
my ( $addr, $sub ) = @_; |
| 500 |
|
|
confess "callback not sub" unless ref($sub) eq 'CODE'; |
| 501 |
|
|
$mmap->{$addr} = $sub; |
| 502 |
|
|
} |
| 503 |
dpavlin |
3 |
}; |
| 504 |
|
|
|
| 505 |
|
|
# Generate register accessors. |
| 506 |
|
|
for my $reg (qw(a x y s p pc)) { |
| 507 |
|
|
$cpu{$id}->{"get_$reg"} = eval "sub { return \$$reg; }"; |
| 508 |
|
|
$cpu{$id}->{"set_$reg"} = eval "sub { \$$reg = \$_[0]; }"; |
| 509 |
|
|
} |
| 510 |
|
|
} |
| 511 |
|
|
|
| 512 |
|
|
sub AUTOMETHOD { |
| 513 |
|
|
my ($self, $id, @args) = @_; |
| 514 |
|
|
my $methname = $_; |
| 515 |
|
|
|
| 516 |
|
|
if (exists($cpu{$id}->{$methname})) { |
| 517 |
|
|
return sub { |
| 518 |
|
|
return $cpu{$id}->{$methname}->(@args); |
| 519 |
|
|
} |
| 520 |
|
|
} |
| 521 |
|
|
|
| 522 |
|
|
return; |
| 523 |
|
|
} |
| 524 |
|
|
|
| 525 |
|
|
sub call_os { |
| 526 |
|
|
my $self = shift; |
| 527 |
|
|
my $id = ident($self); |
| 528 |
|
|
croak "call_os() not supported"; |
| 529 |
|
|
} |
| 530 |
|
|
|
| 531 |
|
|
# Functions that generate code fragments |
| 532 |
|
|
sub _push { |
| 533 |
|
|
my $r = ''; |
| 534 |
|
|
for (@_) { |
| 535 |
|
|
$r .= |
| 536 |
|
|
'$mem[STACK + $s] = (' . $_ |
| 537 |
|
|
. ') & 0xFF; $s = ($s - 1) & 0xFF;' . "\n"; |
| 538 |
|
|
} |
| 539 |
|
|
return $r; |
| 540 |
|
|
} |
| 541 |
|
|
|
| 542 |
|
|
sub _pop { |
| 543 |
|
|
my $r = ''; |
| 544 |
|
|
for (@_) { |
| 545 |
|
|
$r .= |
| 546 |
|
|
'$s = ($s + 1) & 0xFF; ' . $_ |
| 547 |
|
|
. ' = $mem[STACK + $s];' . "\n"; |
| 548 |
|
|
} |
| 549 |
|
|
return $r; |
| 550 |
|
|
} |
| 551 |
|
|
|
| 552 |
|
|
sub _pop_p { |
| 553 |
|
|
return '$s = ($s + 1) & 0xFF; $p = $mem[STACK + $s] | R | B;' |
| 554 |
|
|
. "\n"; |
| 555 |
|
|
} |
| 556 |
|
|
|
| 557 |
|
|
# Addressing modes return a list containing setup code, lvalue |
| 558 |
|
|
sub _zpix { |
| 559 |
|
|
return ( |
| 560 |
|
|
'my $ea = $mem[$pc++] + $x; ' |
| 561 |
|
|
. '$ea = $mem[$ea & 0xFF] | ($mem[($ea + 1) & 0xFF] << 8)' |
| 562 |
|
|
. ";\n", |
| 563 |
|
|
'$mem[$ea]' |
| 564 |
|
|
); |
| 565 |
|
|
} |
| 566 |
|
|
|
| 567 |
|
|
sub _zpi { |
| 568 |
|
|
return ( |
| 569 |
|
|
'my $ea = $mem[$pc++]; ' |
| 570 |
|
|
. '$ea = $mem[$ea & 0xFF] | ($mem[($ea + 1) & 0xFF] << 8)' |
| 571 |
|
|
. ";\n", |
| 572 |
|
|
'$mem[$ea]' |
| 573 |
|
|
); |
| 574 |
|
|
} |
| 575 |
|
|
|
| 576 |
|
|
sub _zpiy { |
| 577 |
|
|
return ( |
| 578 |
|
|
'my $ea = $mem[$pc++]; ' |
| 579 |
|
|
. '$ea = ($mem[$ea & 0xFF] | ($mem[($ea + 1) & 0xFF] << 8)) + $y' |
| 580 |
|
|
. ";\n", |
| 581 |
|
|
'$mem[$ea]' |
| 582 |
|
|
); |
| 583 |
|
|
} |
| 584 |
|
|
|
| 585 |
|
|
sub _zp { |
| 586 |
|
|
return ('my $ea = $mem[$pc++];' . "\n", '$mem[$ea]'); |
| 587 |
|
|
} |
| 588 |
|
|
|
| 589 |
|
|
sub _zpx { |
| 590 |
|
|
return ('my $ea = ($mem[$pc++] + $x) & 0xFF;' . "\n", '$mem[$ea]'); |
| 591 |
|
|
} |
| 592 |
|
|
|
| 593 |
|
|
sub _zpy { |
| 594 |
|
|
return ('my $ea = ($mem[$pc++] + $y) & 0xFF;' . "\n", '$mem[$ea]'); |
| 595 |
|
|
} |
| 596 |
|
|
|
| 597 |
|
|
sub _abs { |
| 598 |
|
|
return ('my $ea = $mem[$pc] | ($mem[$pc+1] << 8); $pc += 2;' . "\n", |
| 599 |
|
|
'$mem[$ea]'); |
| 600 |
|
|
} |
| 601 |
|
|
|
| 602 |
|
|
sub _absx { |
| 603 |
|
|
return ( |
| 604 |
|
|
'my $ea = ($mem[$pc] | ($mem[$pc+1] << 8)) + $x; $pc += 2;' |
| 605 |
|
|
. "\n", |
| 606 |
|
|
'$mem[$ea]' |
| 607 |
|
|
); |
| 608 |
|
|
} |
| 609 |
|
|
|
| 610 |
|
|
sub _absy { |
| 611 |
|
|
return ( |
| 612 |
|
|
'my $ea = ($mem[$pc] | ($mem[$pc+1] << 8)) + $y; $pc += 2;' |
| 613 |
|
|
. "\n", |
| 614 |
|
|
'$mem[$ea]' |
| 615 |
|
|
); |
| 616 |
|
|
} |
| 617 |
|
|
|
| 618 |
|
|
sub _imm { |
| 619 |
|
|
return ('my $v = $mem[$pc++];' . "\n", '$v'); |
| 620 |
|
|
} |
| 621 |
|
|
|
| 622 |
|
|
sub _acc { |
| 623 |
|
|
return ('', '$a'); |
| 624 |
|
|
} |
| 625 |
|
|
|
| 626 |
|
|
sub _rel { |
| 627 |
|
|
# Doesn't return an lvalue |
| 628 |
|
|
return ('my $t = $mem[$pc++];' . "\n", |
| 629 |
|
|
'($pc + $t - (($t & 0x80) ? 0x100 : 0))'); |
| 630 |
|
|
} |
| 631 |
|
|
|
| 632 |
|
|
sub _status { |
| 633 |
|
|
my $reg = shift || '$a'; |
| 634 |
|
|
return '$p = ($p & ~(N | Z) | $zn[' . $reg . ']);' . "\n"; |
| 635 |
|
|
} |
| 636 |
|
|
|
| 637 |
|
|
sub _ora { |
| 638 |
|
|
return $_[0] . '$a |= ' . $_[1] . ";\n" . _status(); |
| 639 |
|
|
} |
| 640 |
|
|
|
| 641 |
|
|
sub _and { |
| 642 |
|
|
return $_[0] . '$a &= ' . $_[1] . ";\n" . _status(); |
| 643 |
|
|
} |
| 644 |
|
|
|
| 645 |
|
|
sub _eor { |
| 646 |
|
|
return $_[0] . '$a ^= ' . $_[1] . ";\n" . _status(); |
| 647 |
|
|
} |
| 648 |
|
|
|
| 649 |
|
|
sub _bit { |
| 650 |
|
|
return $_[0] |
| 651 |
|
|
. '$p = ($p & ~(N|V)) | (' |
| 652 |
|
|
. $_[1] |
| 653 |
|
|
. ' & (N|V));' . "\n" |
| 654 |
|
|
. 'if (($a & ' |
| 655 |
|
|
. $_[1] |
| 656 |
|
|
. ') == 0) { $p |= Z; } else { $p &= ~Z; }' . "\n"; |
| 657 |
|
|
} |
| 658 |
|
|
|
| 659 |
|
|
sub _asl { |
| 660 |
|
|
return $_[0] |
| 661 |
|
|
. 'my $w = (' |
| 662 |
|
|
. $_[1] |
| 663 |
|
|
. ') << 1; ' . "\n" |
| 664 |
|
|
. 'if ($w & 0x100) { $p |= C; $w &= ~0x100; } else { $p &= ~C; }' |
| 665 |
|
|
. "\n" |
| 666 |
|
|
. _status('$w') |
| 667 |
|
|
. $_[1] |
| 668 |
|
|
. ' = $w;' . "\n"; |
| 669 |
|
|
} |
| 670 |
|
|
|
| 671 |
|
|
sub _lsr { |
| 672 |
|
|
return $_[0] |
| 673 |
|
|
. 'my $w = ' |
| 674 |
|
|
. $_[1] . ";\n" |
| 675 |
|
|
. 'if (($w & 1) != 0) { $p |= C; } else { $p &= ~C; }' . "\n" |
| 676 |
|
|
. '$w >>= 1;' . "\n" |
| 677 |
|
|
. _status('$w') |
| 678 |
|
|
. $_[1] |
| 679 |
|
|
. ' = $w;' . "\n"; |
| 680 |
|
|
} |
| 681 |
|
|
|
| 682 |
|
|
sub _rol { |
| 683 |
|
|
return $_[0] |
| 684 |
|
|
. 'my $w = (' |
| 685 |
|
|
. $_[1] |
| 686 |
|
|
. ' << 1) | ($p & C);' . "\n" |
| 687 |
|
|
. 'if ($w >= 0x100) { $p |= C; $w -= 0x100; } else { $p &= ~C; };' |
| 688 |
|
|
. "\n" |
| 689 |
|
|
. _status('$w') |
| 690 |
|
|
. $_[1] |
| 691 |
|
|
. ' = $w;' . "\n"; |
| 692 |
|
|
} |
| 693 |
|
|
|
| 694 |
|
|
sub _ror { |
| 695 |
|
|
return $_[0] |
| 696 |
|
|
. 'my $w = ' |
| 697 |
|
|
. $_[1] |
| 698 |
|
|
. ' | (($p & C) << 8);' . "\n" |
| 699 |
|
|
. 'if (($w & 1) != 0) { $p |= C; } else { $p &= ~C; }' . "\n" |
| 700 |
|
|
. '$w >>= 1;' . "\n" |
| 701 |
|
|
. _status('$w') |
| 702 |
|
|
. $_[1] |
| 703 |
|
|
. ' = $w;' . "\n"; |
| 704 |
|
|
} |
| 705 |
|
|
|
| 706 |
|
|
sub _sto { |
| 707 |
|
|
return $_[0] . "$_[1] = $_[2];\n"; |
| 708 |
|
|
} |
| 709 |
|
|
|
| 710 |
|
|
sub _lod { |
| 711 |
|
|
return $_[0] . "$_[2] = $_[1];\n" . _status($_[2]); |
| 712 |
|
|
} |
| 713 |
|
|
|
| 714 |
|
|
sub _cmp { |
| 715 |
|
|
return $_[0] |
| 716 |
|
|
. 'my $w = ' |
| 717 |
|
|
. $_[2] . ' - ' |
| 718 |
|
|
. $_[1] . ";\n" |
| 719 |
|
|
. 'if ($w < 0) { $w += 0x100; $p &= ~C; } else { $p |= C; }' |
| 720 |
|
|
. "\n" |
| 721 |
|
|
. _status('$w'); |
| 722 |
|
|
} |
| 723 |
|
|
|
| 724 |
|
|
sub _tsb { |
| 725 |
|
|
return 'croak "TSB not supported\n";' . "\n"; |
| 726 |
|
|
} |
| 727 |
|
|
|
| 728 |
|
|
sub _trb { |
| 729 |
|
|
return 'croak "TRB not supported\n";' . "\n"; |
| 730 |
|
|
} |
| 731 |
|
|
|
| 732 |
|
|
sub _inc { |
| 733 |
|
|
return $_[0] |
| 734 |
|
|
. $_[1] . ' = (' |
| 735 |
|
|
. $_[1] |
| 736 |
|
|
. ' + 1) & 0xFF;' . "\n" |
| 737 |
|
|
. _status($_[1]); |
| 738 |
|
|
} |
| 739 |
|
|
|
| 740 |
|
|
sub _dec { |
| 741 |
|
|
return $_[0] |
| 742 |
|
|
. $_[1] . ' = (' |
| 743 |
|
|
. $_[1] |
| 744 |
|
|
. ' + 0xFF) & 0xFF;' . "\n" |
| 745 |
|
|
. _status($_[1]); |
| 746 |
|
|
} |
| 747 |
|
|
|
| 748 |
|
|
sub _adc { |
| 749 |
|
|
return $_[0] |
| 750 |
|
|
. 'my $w = ' |
| 751 |
|
|
. $_[1] . ";\n" |
| 752 |
|
|
. 'if ($p & D) {' . "\n" |
| 753 |
|
|
. 'my $lo = ($a & 0x0F) + ($w & 0x0F) + ($p & C);' . "\n" |
| 754 |
|
|
. 'if ($lo > 9) { $lo += 6; }' . "\n" |
| 755 |
|
|
. 'my $hi = ($a >> 4) + ( $w >> 4) + ($lo > 15 ? 1 : 0);' . "\n" |
| 756 |
|
|
. '$a = ($lo & 0x0F) | ($hi << 4);' . "\n" |
| 757 |
|
|
. '$p = ($p & ~C) | ($hi > 15 ? C : 0);' . "\n" |
| 758 |
|
|
. '} else {' . "\n" |
| 759 |
|
|
. 'my $lo = $a + $w + ($p & C);' . "\n" |
| 760 |
|
|
. '$p &= ~(N | V | Z | C);' . "\n" |
| 761 |
|
|
. '$p |= (~($a ^ $w) & ($a ^ $lo) & 0x80 ? V : 0) | ($lo & 0x100 ? C : 0);' |
| 762 |
|
|
. "\n" |
| 763 |
|
|
. '$a = $lo & 0xFF;' . "\n" |
| 764 |
|
|
. _status() . '}' . "\n"; |
| 765 |
|
|
} |
| 766 |
|
|
|
| 767 |
|
|
sub _sbc { |
| 768 |
|
|
return $_[0] |
| 769 |
|
|
. 'my $w = ' |
| 770 |
|
|
. $_[1] . ";\n" |
| 771 |
|
|
. 'if ($p & D) {' . "\n" |
| 772 |
|
|
. 'my $lo = ($a & 0x0F) - ($w & 0x0F) - (~$p & C);' . "\n" |
| 773 |
|
|
. 'if ($lo & 0x10) { $lo -= 6; }' . "\n" |
| 774 |
|
|
. 'my $hi = ($a >> 4) - ($w >> 4) - (($lo & 0x10) >> 4);' . "\n" |
| 775 |
|
|
. 'if ($hi & 0x10) { $hi -= 6; }' . "\n" |
| 776 |
|
|
. '$a = ($lo & 0x0F) | ($hi << 4);' . "\n" |
| 777 |
|
|
. '$p = ($p & ~C) | ($hi > 15 ? 0 : C);' . "\n" |
| 778 |
|
|
. '} else {' . "\n" |
| 779 |
|
|
. 'my $lo = $a - $w - (~$p & C);' . "\n" |
| 780 |
|
|
. '$p &= ~(N | V | Z | C);' . "\n" |
| 781 |
|
|
. '$p |= (($a ^ $w) & ($a ^ $lo) & 0x80 ? V : 0) | ($lo & 0x100 ? 0 : C);' |
| 782 |
|
|
. "\n" |
| 783 |
|
|
. '$a = $lo & 0xFF;' . "\n" |
| 784 |
|
|
. _status() . '}' . "\n"; |
| 785 |
|
|
} |
| 786 |
|
|
|
| 787 |
|
|
sub _bra { |
| 788 |
|
|
return $_[0] . '$pc = ' . $_[1] . ";\n"; |
| 789 |
|
|
} |
| 790 |
|
|
|
| 791 |
|
|
sub _bfz { |
| 792 |
|
|
return $_[0] |
| 793 |
|
|
. 'if (($p & ' |
| 794 |
|
|
. $_[2] |
| 795 |
|
|
. ') == 0) { $pc = ' |
| 796 |
|
|
. $_[1] . '; }' . "\n"; |
| 797 |
|
|
} |
| 798 |
|
|
|
| 799 |
|
|
sub _bfnz { |
| 800 |
|
|
return $_[0] |
| 801 |
|
|
. 'if (($p & ' |
| 802 |
|
|
. $_[2] |
| 803 |
|
|
. ') != 0) { $pc = ' |
| 804 |
|
|
. $_[1] . '; }' . "\n"; |
| 805 |
|
|
} |
| 806 |
|
|
|
| 807 |
|
|
sub _jmp_i { |
| 808 |
|
|
my $a = shift; |
| 809 |
|
|
return '$pc = $mem[' . $a |
| 810 |
|
|
. '] | ($mem[' |
| 811 |
|
|
. $a |
| 812 |
|
|
. ' + 1] << 8);' . "\n"; |
| 813 |
|
|
} |
| 814 |
|
|
|
| 815 |
|
|
sub _jmp { |
| 816 |
|
|
return _jmp_i('$pc'); |
| 817 |
|
|
} |
| 818 |
|
|
|
| 819 |
|
|
sub _jmpi { |
| 820 |
|
|
return 'my $w = $mem[$pc] | ($mem[$pc + 1] << 8); ' . _jmp_i('$w'); |
| 821 |
|
|
} |
| 822 |
|
|
|
| 823 |
|
|
sub _jmpix { |
| 824 |
|
|
return 'my $w = ($mem[$pc] | ($mem[$pc + 1] << 8)) + $x; ' |
| 825 |
|
|
. _jmp_i('$w'); |
| 826 |
|
|
} |
| 827 |
|
|
|
| 828 |
|
|
sub _rts { |
| 829 |
|
|
return 'my ($lo, $hi); ' |
| 830 |
|
|
. _pop('$lo') |
| 831 |
|
|
. _pop('$hi') |
| 832 |
|
|
. '$pc = ($lo | ($hi << 8)) + 1;' . "\n"; |
| 833 |
|
|
} |
| 834 |
|
|
|
| 835 |
|
|
1; |
| 836 |
|
|
__END__ |
| 837 |
|
|
|
| 838 |
|
|
=head1 NAME |
| 839 |
|
|
|
| 840 |
|
|
Acme::6502 - Pure Perl 65C02 simulator. |
| 841 |
|
|
|
| 842 |
|
|
=head1 VERSION |
| 843 |
|
|
|
| 844 |
|
|
This document describes Acme::6502 version 0.0.6 |
| 845 |
|
|
|
| 846 |
|
|
=head1 SYNOPSIS |
| 847 |
|
|
|
| 848 |
|
|
use Acme::6502; |
| 849 |
|
|
|
| 850 |
|
|
my $cpu = Acme::6502->new(); |
| 851 |
|
|
|
| 852 |
|
|
# Set start address |
| 853 |
|
|
$cpu->set_pc(0x8000); |
| 854 |
|
|
|
| 855 |
|
|
# Load ROM image |
| 856 |
|
|
$cpu->load_rom('myrom.rom', 0x8000); |
| 857 |
|
|
|
| 858 |
|
|
# Run for 1,000,000 instructions then return |
| 859 |
|
|
$cpu->run(1_000_000); |
| 860 |
|
|
|
| 861 |
|
|
=head1 DESCRIPTION |
| 862 |
|
|
|
| 863 |
|
|
Imagine the nightmare scenario: your boss tells you about a legacy |
| 864 |
|
|
system you have to support. How bad could it be? COBOL? Fortran? Worse: |
| 865 |
|
|
it's an embedded 6502 system run by a family of squirrels (see Dilberts |
| 866 |
|
|
passim). Fortunately there's a pure Perl 6502 emulator that works so |
| 867 |
|
|
well the squirrels will never know the difference. |
| 868 |
|
|
|
| 869 |
|
|
=head1 INTERFACE |
| 870 |
|
|
|
| 871 |
|
|
=over |
| 872 |
|
|
|
| 873 |
|
|
=item C<call_os( $vec_number )> |
| 874 |
|
|
|
| 875 |
|
|
Subclass to provide OS entry points. OS vectors are installed by calling |
| 876 |
|
|
C<make_vector>. When the vector is called C<call_os()> will be called |
| 877 |
|
|
with the vector number. |
| 878 |
|
|
|
| 879 |
|
|
=item C<get_a()> |
| 880 |
|
|
|
| 881 |
|
|
Read the current value of the processor A register (accumulator). |
| 882 |
|
|
|
| 883 |
|
|
=item C<get_p()> |
| 884 |
|
|
|
| 885 |
|
|
Read the current value of the processor status register. |
| 886 |
|
|
|
| 887 |
|
|
=item C<get_pc()> |
| 888 |
|
|
|
| 889 |
|
|
Read the current value of the program counter. |
| 890 |
|
|
|
| 891 |
|
|
=item C<get_s()> |
| 892 |
|
|
|
| 893 |
|
|
Read the current value of the stack pointer. |
| 894 |
|
|
|
| 895 |
|
|
=item C<get_x()> |
| 896 |
|
|
|
| 897 |
|
|
Read the current value of the processor X index register. |
| 898 |
|
|
|
| 899 |
|
|
=item C<get_y()> |
| 900 |
|
|
|
| 901 |
|
|
Read the current value of the processor X index register. |
| 902 |
|
|
|
| 903 |
|
|
=item C<get_xy()> |
| 904 |
|
|
|
| 905 |
|
|
Read the value of X and Y as a sixteen bit number. X forms the lower 8 |
| 906 |
|
|
bits of the value and Y forms the upper 8 bits. |
| 907 |
|
|
|
| 908 |
|
|
=item C<get_state()> |
| 909 |
|
|
|
| 910 |
|
|
Returns an array containing the values of the A, X, Y, S, P and SP. |
| 911 |
|
|
|
| 912 |
|
|
=item C<set_a( $value )> |
| 913 |
|
|
|
| 914 |
|
|
Set the value of the processor A register (accumulator). |
| 915 |
|
|
|
| 916 |
|
|
=item C<set_p( $value )> |
| 917 |
|
|
|
| 918 |
|
|
Set the value of the processor status register. |
| 919 |
|
|
|
| 920 |
|
|
=item C<set_pc( $value )> |
| 921 |
|
|
|
| 922 |
|
|
Set the value of the program counter. |
| 923 |
|
|
|
| 924 |
|
|
=item C<set_s( $value )> |
| 925 |
|
|
|
| 926 |
|
|
Set the value of the stack pointer. |
| 927 |
|
|
|
| 928 |
|
|
=item C<set_x( $value )> |
| 929 |
|
|
|
| 930 |
|
|
Set the value of the X index register. |
| 931 |
|
|
|
| 932 |
|
|
=item C<set_y( $value )> |
| 933 |
|
|
|
| 934 |
|
|
Set the value of the Y index register. |
| 935 |
|
|
|
| 936 |
|
|
=item C<set_xy( $value )> |
| 937 |
|
|
|
| 938 |
|
|
Set the value of the X and Y registers to the specified sixteen bit |
| 939 |
|
|
number. X gets the lower 8 bits, Y gets the upper 8 bits. |
| 940 |
|
|
|
| 941 |
|
|
=item C<set_jumptab( $addr )> |
| 942 |
|
|
|
| 943 |
|
|
Set the address of the block of memory that will be used to hold the |
| 944 |
|
|
thunk blocks that correspond with vectored OS entry points. Each thunk |
| 945 |
|
|
takes four bytes. |
| 946 |
|
|
|
| 947 |
|
|
=item C<load_rom( $filename, $addr )> |
| 948 |
|
|
|
| 949 |
|
|
Load a ROM image at the specified address. |
| 950 |
|
|
|
| 951 |
|
|
=item C<make_vector( $jmp_addr, $vec_addr, $vec_number )> |
| 952 |
|
|
|
| 953 |
|
|
Make a vectored entry point for an emulated OS. C<$jmp_addr> is the |
| 954 |
|
|
address where an indirect JMP instruction (6C) will be placed, |
| 955 |
|
|
C<$vec_addr> is the address of the vector and C<$vec_number> will be |
| 956 |
|
|
passed to C<call_os> when the OS call is made. |
| 957 |
|
|
|
| 958 |
|
|
=item C<poke_code( $addr, @bytes )> |
| 959 |
|
|
|
| 960 |
|
|
Poke code directly at the specified address. |
| 961 |
|
|
|
| 962 |
|
|
=item C<read_8( $addr )> |
| 963 |
|
|
|
| 964 |
|
|
Read a byte at the specified address. |
| 965 |
|
|
|
| 966 |
|
|
=item C<read_16( $addr )> |
| 967 |
|
|
|
| 968 |
|
|
Read a sixteen bit (low, high) word at the specified address. |
| 969 |
|
|
|
| 970 |
|
|
=item C<read_32( $addr )> |
| 971 |
|
|
|
| 972 |
|
|
Read a 32 bit word at the specified address. |
| 973 |
|
|
|
| 974 |
|
|
=item C<read_chunk( $start, $end )> |
| 975 |
|
|
|
| 976 |
|
|
Read a chunk of data from C<$start> to C<$end> - 1 into a string. |
| 977 |
|
|
|
| 978 |
|
|
=item C<read_str( $addr )> |
| 979 |
|
|
|
| 980 |
|
|
Read a carriage return terminated (0x0D) string from the |
| 981 |
|
|
specified address. |
| 982 |
|
|
|
| 983 |
|
|
=item C<run( $count [, $callback ] )> |
| 984 |
|
|
|
| 985 |
|
|
Execute the specified number of instructions and return. Optionally a |
| 986 |
|
|
callback may be provided in which case it will be called before each |
| 987 |
|
|
instruction is executed: |
| 988 |
|
|
|
| 989 |
|
|
my $cb = sub { |
| 990 |
|
|
my ($pc, $inst, $a, $x, $y, $s, $p) = @_; |
| 991 |
|
|
# Maybe output trace info |
| 992 |
|
|
} |
| 993 |
|
|
|
| 994 |
|
|
$cpu->run(100, $cb); |
| 995 |
|
|
|
| 996 |
|
|
=item C<write_8( $addr, $value )> |
| 997 |
|
|
|
| 998 |
|
|
Write the byte at the specified address. |
| 999 |
|
|
|
| 1000 |
|
|
=item C<write_16( $addr, $value )> |
| 1001 |
|
|
|
| 1002 |
|
|
Write a sixteen bit (low, high) value at the specified address. |
| 1003 |
|
|
|
| 1004 |
|
|
=item C<write_32( $addr, $value )> |
| 1005 |
|
|
|
| 1006 |
|
|
Write a 32 bit value at the specified address. |
| 1007 |
|
|
|
| 1008 |
|
|
=item C<write_chunk( $addr, $string )> |
| 1009 |
|
|
|
| 1010 |
|
|
Write a chunk of data to memory. |
| 1011 |
|
|
|
| 1012 |
|
|
=back |
| 1013 |
|
|
|
| 1014 |
|
|
=head1 DIAGNOSTICS |
| 1015 |
|
|
|
| 1016 |
|
|
=over |
| 1017 |
|
|
|
| 1018 |
|
|
=item C<< Bad instruction at %s (%s) >> |
| 1019 |
|
|
|
| 1020 |
|
|
The emulator hit an illegal 6502 instruction. |
| 1021 |
|
|
|
| 1022 |
|
|
=back |
| 1023 |
|
|
|
| 1024 |
|
|
=head1 CONFIGURATION AND ENVIRONMENT |
| 1025 |
|
|
|
| 1026 |
|
|
Acme::6502 requires no configuration files or environment variables. |
| 1027 |
|
|
|
| 1028 |
|
|
=head1 DEPENDENCIES |
| 1029 |
|
|
|
| 1030 |
|
|
C<Acme::6502> needs C<Class::Std>. |
| 1031 |
|
|
|
| 1032 |
|
|
=head1 INCOMPATIBILITIES |
| 1033 |
|
|
|
| 1034 |
|
|
None reported. |
| 1035 |
|
|
|
| 1036 |
|
|
=head1 BUGS AND LIMITATIONS |
| 1037 |
|
|
|
| 1038 |
|
|
Doesn't have support for hardware emulation hooks - so memory mapped I/O |
| 1039 |
|
|
is out of the question until someone fixes it. |
| 1040 |
|
|
|
| 1041 |
|
|
Please report any bugs or feature requests to |
| 1042 |
|
|
C<bug-acme-6502@rt.cpan.org>, or through the web interface at |
| 1043 |
|
|
L<http://rt.cpan.org>. |
| 1044 |
|
|
|
| 1045 |
|
|
=head1 AUTHOR |
| 1046 |
|
|
|
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Andy Armstrong C<< <andy@hexten.net> >> |
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=head1 LICENCE AND COPYRIGHT |
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Copyright (c) 2006, Andy Armstrong C<< <andy@hexten.net> >>. All rights reserved. |
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This module is free software; you can redistribute it and/or |
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modify it under the same terms as Perl itself. See L<perlartistic>. |
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=head1 DISCLAIMER OF WARRANTY |
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BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY |
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FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN |
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OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES |
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PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER |
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EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE |
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ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH |
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YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL |
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NECESSARY SERVICING, REPAIR, OR CORRECTION. |
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IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING |
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WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR |
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REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE |
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LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, |
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OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE |
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THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING |
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RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A |
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FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF |
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SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF |
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SUCH DAMAGES. |
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