/[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 30 by dpavlin, Mon Jul 30 17:56:13 2007 UTC revision 90 by dpavlin, Thu Aug 2 12:23:18 2007 UTC
# Line 5  use warnings; Line 5  use warnings;
5    
6  use Data::Dump qw/dump/;  use Data::Dump qw/dump/;
7  use Carp qw/confess/;  use Carp qw/confess/;
8    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  =head1 NAME  =head1 NAME
15    
16  M6502 - perl bindings for 6502 emulator  M6502 - perl bindings for M6502 CPU emulator
17    
18  =cut  =head1 FUNCTIONS
19    
20  my $debug = 1;  =cut
21    
22  our $VERSION = qw(0.0.1);  our $debug = 0;
23    
24  our @mem = (0xff) x 0x10000;    # 64M  our @mem = (0xff) x 0x10000;    # 64M
25    
# Line 22  our @mem = (0xff) x 0x10000;   # 64M Line 27  our @mem = (0xff) x 0x10000;   # 64M
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 = 1;  
   
 =head1 init  
30    
31  Called before C<Run6502>  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  =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 {  sub init {
67          warn "inside init\n";          my $self = shift;
68          print "stdout\n";          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 read  =head2 poke_code
79    
80  Read from memory  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    $byte = read( $address );    $emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa );
84    
85  =cut  =cut
86    
87  sub read {  sub poke_code {
88          my ($addr) = @_;          my $self = shift;
89          my $byte = $mem[$addr];          my $addr = shift;
90          warn "# read(",dump(@_),") = ",dump( $byte ),"\n" if $debug;          warn sprintf("## M6502::poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;
91          return $byte;          #$mem[$addr++] = $_ foreach @_;
92            # call low-level write
93            $_rw_hooks->{write}->( $addr++, $_ ) foreach @_;
94  }  }
95    
96  =head2 write  =head2 ram
97    
98  Write into emory  Read series of bytes into memory without MMU interaction
99    
100    write( $address, $byte );    my @code = $emu->ram( 0xc000, 0xc1000 );
101    
102  =cut  =cut
103    
104  sub write {  sub ram {
105          warn "# write(",dump(@_),")\n" if $debug;          my $self = shift;
106          my ($addr,$byte) = @_;          my ( $from, $to ) = @_;
107          $mem[$addr] = $byte;          warn sprintf("## M6502::ram(%04x,%04x)\n", $from, $to) if $self->debug;
108            return @mem[ $from .. $to ];
109  }  }
110    
111  =head2 poke_code  =head2 write_chunk
112    
113  Write series of bytes into memory without passing through MMU  Low-level update of memory, overriding user specified MMU functions C<read> and C<write>
114    
115    $emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa );    $emu->write_chunk( $address, $chunk_of_data );
116    
117  =cut  =cut
118    
119  sub poke_code {  sub write_chunk {
120          my $self = shift;          my ($self, $addr, $chunk) = @_;
121          my $addr = shift;          my $len = length($chunk);
122          warn sprintf("# poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;          splice @mem, $addr, $len, unpack('C*', $chunk);
         $mem[$addr++] = $_ foreach @_;  
123  }  }
124    
125  =head2 ram  =head2 prompt
126    
127    Call this after C<< $run_for >> cycles have been run on processor
128    
129  Read searies of bytes from memory without passing through MMU  =cut
130    
131    $emu->ram( $from, $to );  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  =cut
147    
148  sub ram {  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;          my $self = shift;
206          my ($from,$to) = @_;          my $value = shift;
207          if ($from + $to) {          if (defined($value)) {
208                  printf "ram %04x - %04x\n", $from, $to;                  $debug = M6502::set_debug($value);
209                  return $mem[$from .. $to - 1];          } else {
210                    $debug = M6502::get_debug();
211          }          }
212          printf "ram %04x\n", $from;          return $debug;
         return $mem[$from] if defined($from);  
         confess "no from address";  
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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