/[VRac]/M6502/M6502.pm
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 25 by dpavlin, Mon Jul 30 14:02:31 2007 UTC revision 89 by dpavlin, Thu Aug 2 12:01:09 2007 UTC
# Line 3  package M6502; Line 3  package M6502;
3  use strict;  use strict;
4  use warnings;  use warnings;
5    
6  # Dobrica Pavlinusic, <dpavlin@rot13.org> 07/30/07 13:23:19 CEST  use Data::Dump qw/dump/;
7  #  use Carp qw/confess/;
8  # Simple Orao emulation  use Exporter 'import';
9    our @EXPORT = qw'dump_R @mem $PC $A $P $X $Y $S $IPeriod $ICount $IRequest $IAutoReset $TrapBadOps $Trap $Trace $run_for $debug';
10    our $VERSION = '0.0.2';
11    require XSLoader;
12    XSLoader::load('M6502', $VERSION);
13    
14  my $mem = (0) x 0x10000;        # 64M  =head1 NAME
15    
16    M6502 - perl bindings for M6502 CPU emulator
17    
18    =head1 FUNCTIONS
19    
20    =cut
21    
22    our $debug = 0;
23    
24    our @mem = (0xff) x 0x10000;    # 64M
25    
26  # program counter  # program counter
27  our $PC = 0xbeef;  our $PC = 0xbeef;
28  # CPU registars  # CPU registars
29  our ( $A, $P, $X, $Y, $S ) = (0) x 5;  our ( $A, $P, $X, $Y, $S ) = (0) x 5;
 # Set IPeriod to number of CPU cycles between calls to Loop6502  
 our $IPeriod = 20000;  
30    
31    our $IPeriod=1;         # Set IPeriod to number of CPU cycles between calls to Loop6502
32    our $ICount;
33    our $IRequest;          # Set to the INT_IRQ when pending IRQ
34    our $IAutoReset;        # Set to 1 to autom. reset IRequest
35    our $TrapBadOps=1;      # Set to 1 to warn of illegal opcodes
36    our $Trap;                      # Set Trap to address to trace from
37    our $Trace;                     # Set Trace=1 to start tracing
38    
39    # Exec6502 cycles
40    our $run_for = 0;
41    
42    =head2 init
43    
44    Setup read and write memory hooks (to implement memory mapped devices)
45    
46      $init->(
47            read => sub {
48                    return $mem[$_[0]];
49            },
50            write => sub {
51                    $mem[$_[0]] = $_[1];
52            },
53      );
54    
55    =cut
56    
57    our $_rw_hooks = {
58            read => sub {
59                    return $mem[$_[0]];
60            },
61            write => sub {
62                    $mem[$_[0]] = $_[1];
63            },
64    };
65    
66    sub init {
67            my $self = shift;
68            my $args = {@_};
69            warn "inside init low-level M6502 from ",ref($self),"\n";
70    
71            foreach my $p ( qw/read write/ ) {
72                    confess "need $p argument as coderef" unless ( $args->{$p} && ref($args->{$p}) eq 'CODE' );
73                    $_rw_hooks->{$p} = $args->{$p};
74            }
75    
76    };
77    
78    =head2 poke_code
79    
80    Write series of bytes into memory passing through MMU (C<read> and C<write>)
81    functions. If you don't want to trigger MMU, use C<write_chunk>.
82    
83      $emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa );
84    
85    =cut
86    
87    sub poke_code {
88            my $self = shift;
89            my $addr = shift;
90            warn sprintf("## M6502::poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;
91            #$mem[$addr++] = $_ foreach @_;
92            # call low-level write
93            M6502::write($addr++, $_) foreach @_;
94    }
95    
96    =head2 ram
97    
98    Read series of bytes into memory without MMU interaction
99    
100      my @code = $emu->ram( 0xc000, 0xc1000 );
101    
102    =cut
103    
104    sub ram {
105            my $self = shift;
106            my ( $from, $to ) = @_;
107            warn sprintf("## M6502::ram(%04x,%04x)\n", $from, $to) if $self->debug;
108            return @mem[ $from .. $to ];
109    }
110    
111    =head2 write_chunk
112    
113    Low-level update of memory, overriding user specified MMU functions C<read> and C<write>
114    
115      $emu->write_chunk( $address, $chunk_of_data );
116    
117    =cut
118    
119    sub write_chunk {
120            my ($self, $addr, $chunk) = @_;
121            my $len = length($chunk);
122            splice @mem, $addr, $len, unpack('C*', $chunk);
123    }
124    
125    =head2 prompt
126    
127    Call this after C<< $run_for >> cycles have been run on processor
128    
129    =cut
130    
131    sub prompt {
132            warn "prompt -- you should override this\n";
133            return 1;
134    }
135    
136    =head1 XS Callbacks
137    
138    This functions are called from C<M6502.xs>
139    
140    =head2 _read
141    
142    Read from memory C callback
143    
144      $byte = M6502::_read( $address );
145    
146    =cut
147    
148    sub _read {
149            return $_rw_hooks->{read}->( @_ );
150    }
151    
152    =head2 _write
153    
154    Write into memory C callback
155    
156      M6502:_write( $address, $byte );
157    
158    =cut
159    
160    sub _write {
161            return $_rw_hooks->{write}->( @_ );
162    }
163    
164    =head2 _update_perl_R
165    
166    called by C<M6502.xs> to push changes in registars back to perl variables
167    
168    =cut
169    
170    sub _update_perl_R {
171            warn "## M6502::update_perl_R(",dump(@_),")\n" if $debug;
172            ( $A, $P, $X, $Y, $S, $PC, $IPeriod, $ICount, $IRequest, $IAutoReset, $TrapBadOps, $Trap, $Trace ) = @_;
173            dump_R();
174    }
175    
176    =head2 dump_R
177    
178    helper function which dumps registers in humanly readable form
179    
180      my $dump = dump_R;
181    
182    =cut
183    
184    sub dump_R {
185            my $dump = sprintf(" PC: %04x A:%02x P:%02x X:%02x Y:%02x S:%02x "
186                    . "IPeriod:%d ICount:%d IRequest:%02x IAutoReset:%02x TrapBadOps:%d Trap:%d Trace:%d"
187                    . "\n",
188                    $PC, $A, $P, $X, $Y, $S, $IPeriod, $ICount, $IRequest, $IAutoReset, $TrapBadOps, $Trap, $Trace,
189            );
190            warn "## M6502::dump_R $dump" if $debug;
191            return $dump;
192    }
193    
194    =head2 debug
195    
196    Turn perl and C-level debugging on/off
197    
198      $emu->debug( 0 );
199      $emu->debug( 1 );
200      print $emu->debug;
201    
202    =cut
203    
204    sub debug {
205            my $self = shift;
206            my $value = shift;
207            if (defined($value)) {
208                    $debug = M6502::set_debug($value);
209            } else {
210                    $debug = M6502::get_debug();
211            }
212            return $debug;
213    }
214    
215    =head1 SEE ALSO
216    
217    L<Orao> is sample implementation using this module
218    
219    =head1 AUTHOR
220    
221    Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>
222    
223    =head1 COPYRIGHT & LICENSE
224    
225    Copyright 2007 Dobrica Pavlinusic, All Rights Reserved.
226    
227    This program is free software; you can redistribute it and/or modify it
228    under the same terms as Perl itself.
229    
230    =cut
231  1;  1;
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