/[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 68 by dpavlin, Tue Jul 31 17:15:54 2007 UTC revision 203 by dpavlin, Sun Apr 13 22:04:44 2008 UTC
# Line 6  use warnings; Line 6  use warnings;
6  use Data::Dump qw/dump/;  use Data::Dump qw/dump/;
7  use Carp qw/confess/;  use Carp qw/confess/;
8  use Exporter 'import';  use Exporter 'import';
9  our @EXPORT = qw'@mem $PC $A $P $X $Y $S $IPeriod $run_for $debug';  our @EXPORT = qw'dump_R @mem $PC $A $P $X $Y $S $IPeriod $ICount $IRequest $IAutoReset $TrapBadOps $Trap $Trace $debug';
10    our $VERSION = '0.0.3';
11    require XSLoader;
12    XSLoader::load('M6502', $VERSION);
13    
14  =head1 NAME  =head1 NAME
15    
16  M6502 - perl bindings for M6502 CPU emulator  M6502 - perl bindings for M6502 CPU emulator
17    
18  =cut  =head1 FUNCTIONS
19    
20  my $debug = 0;  =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    tie @mem, 'M6502::TieMem';
26    
27  # program counter  # program counter
28  our $PC = 0xbeef;  our $PC = 0xbeef;
29  # CPU registars  # CPU registars
30  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;  
 # Exec6502 cycles  
 our $run_for = 0;  
31    
32  =head1 FUNCTIONS  our $IPeriod=1;         # Set IPeriod to number of CPU cycles between calls to Loop6502
33    our $ICount;
34    our $IRequest;          # Set to the INT_IRQ when pending IRQ
35    our $IAutoReset;        # Set to 1 to autom. reset IRequest
36    our $TrapBadOps=1;      # Set to 1 to warn of illegal opcodes
37    our $Trap;                      # Set Trap to address to trace from
38    our $Trace;                     # Set Trace=1 to start tracing
39    
40  =head2 init  =head2 init
41    
42  Called before C<Run6502>  Setup read and write memory hooks (to implement memory mapped devices)
   
 =cut  
   
 sub init {  
         my $self = shift;  
         warn "inside init low-level M6502 from $self\n";  
 };  
   
 =head2 read  
   
 Read from memory  
43    
44    $byte = read( $address );    $init->(
45            read => sub {
46                    return $mem[$_[0]];
47            },
48            write => sub {
49                    $mem[$_[0]] = $_[1];
50            },
51      );
52    
53  =cut  =cut
54    
55  sub read {  our $_rw_hooks = {
56          my ($addr) = @_;          read => sub {
57          my $byte = $mem[$addr];                  warn sprintf("# callback read(%04x) not implemented\n", @_) if $debug;
58          warn "## M6502::read(",dump(@_),") = ",dump( $byte ),"\n" if $debug;                  return $mem[$_[0]];
59          return $byte;          },
60  }          write => sub {
61                    warn sprintf("# callback write(%04x,%02x) not implemented", @_) if $debug;
62  =head2 write                  $mem[$_[0]] = $_[1];
63            },
64    };
65    
66  Write into emory  sub init {
67            my $self = shift;
68            my $args = {@_};
69            warn "inside init low-level M6502 from ",ref($self),"\n";
70    
71    write( $address, $byte );          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  =cut  };
   
 sub write {  
         warn "## M6502::write(",dump(@_),")\n" if $debug;  
         my ($addr,$byte) = @_;  
         $mem[$addr] = $byte;  
 }  
77    
78  =head2 poke_code  =head2 poke_code
79    
# Line 86  sub poke_code { Line 90  sub poke_code {
90          warn sprintf("## M6502::poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;          warn sprintf("## M6502::poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;
91          #$mem[$addr++] = $_ foreach @_;          #$mem[$addr++] = $_ foreach @_;
92          # call low-level write          # call low-level write
93          Arch::write($addr++, $_) foreach @_;          $_rw_hooks->{write}->( $addr++, $_ ) foreach @_;
94  }  }
95    
96  =head2 ram  =head2 ram
# Line 118  sub write_chunk { Line 122  sub write_chunk {
122          splice @mem, $addr, $len, unpack('C*', $chunk);          splice @mem, $addr, $len, unpack('C*', $chunk);
123  }  }
124    
125  =head2 prompt  =head1 XS Callbacks
126    
127    This functions are called from C<M6502.xs>
128    
129    =head2 _read
130    
131  Call this after C<< $run_for >> cycles have been run on processor  Read from memory C callback
132    
133      $byte = M6502::_read( $address );
134    
135  =cut  =cut
136    
137  sub prompt {  sub _read {
138          warn "prompt -- you should override this\n";          return $_rw_hooks->{read}->( @_ );
         return 1;  
139  }  }
140    
141  =head2 push_R  =head2 _write
142    
143    Write into memory C callback
144    
145  called by C<perl.c> to push changes in registars back to perl variables    M6502:_write( $address, $byte );
146    
147  =cut  =cut
148    
149  sub push_R {  sub _write {
150          warn "## M6502::push_R(",dump(@_),")\n" if $debug;          return $_rw_hooks->{write}->( @_ );
151          my ( $a, $p, $x, $y, $s, $pc ) = @_;  }
152          $PC = $pc;  
153          $S=$s; $X=$x; $Y=$y; $P=$p; $A=$a;  =head2 _update_perl_R
154    
155    called by C<M6502.xs> to push changes in registars back to perl variables
156    
157    =cut
158    
159    sub _update_perl_R {
160            warn "## M6502::update_perl_R(",dump(@_),")\n" if $debug;
161            ( $A, $P, $X, $Y, $S, $PC, $IPeriod, $ICount, $IRequest, $IAutoReset, $TrapBadOps, $Trap, $Trace ) = @_;
162          dump_R();          dump_R();
163  }  }
164    
165    =head1 XS
166    
167    Following functions are implemented in C<M6502.xs> and exported to perl.
168    
169    =head2 set_debug
170    
171      M6502::set_debug( 0 );
172    
173    =head2 get_debug
174    
175      my $debug = M6502::set_debug();
176    
177    =head2 reset
178    
179    Reset 6502 CPU, reading PC from C<0xfffc>
180    
181      M6502::reset();
182    
183    =head2 update_C_R
184    
185    Push perl notion of register values to CPU emulator
186    
187      M6502::update_C_R();
188    
189    =head2 update_perl_R
190    
191    Update perl notion of register values
192    
193      M6502::update_perl_R();
194    
195    =head2 exec
196    
197    Execute cpu for specified number of cycles
198    
199      my $cycles_left = M6502::exec( $execute_cpu_cycles );
200    
201    =head1 Helpers
202    
203  =head2 dump_R  =head2 dump_R
204    
205  helper function which dumps registers in humanly readable form  helper function which dumps registers in humanly readable form
# Line 152  helper function which dumps registers in Line 209  helper function which dumps registers in
209  =cut  =cut
210    
211  sub dump_R {  sub dump_R {
212          my $dump = sprintf(" PC: %04x A:%02x P:%02x X:%02x Y:%02x S:%02x\n", $PC, $A, $P, $X, $Y, $S);          my $dump = sprintf(" PC: %04x A:%02x P:%02x X:%02x Y:%02x S:%02x "
213                    . "IPeriod:%d ICount:%d IRequest:%02x IAutoReset:%02x TrapBadOps:%d Trap:%d Trace:%d"
214                    . "\n",
215                    $PC, $A, $P, $X, $Y, $S, $IPeriod, $ICount, $IRequest, $IAutoReset, $TrapBadOps, $Trap, $Trace,
216            );
217          warn "## M6502::dump_R $dump" if $debug;          warn "## M6502::dump_R $dump" if $debug;
218          return $dump;          return $dump;
219  }  }
220    
221    =head2 debug
222    
223    Turn perl and C-level debugging on/off
224    
225      $emu->debug( 0 );
226      $emu->debug( 1 );
227      print $emu->debug;
228    
229    =cut
230    
231    sub debug {
232            my $self = shift;
233            my $value = shift;
234            if (defined($value)) {
235                    $debug = M6502::set_debug($value);
236            } else {
237                    $debug = M6502::get_debug();
238            }
239            return $debug;
240    }
241    
242  =head1 SEE ALSO  =head1 SEE ALSO
243    
244  L<Orao> is sample implementation using this module  L<Orao> is sample implementation using this module
# Line 167  Dobrica Pavlinusic, C<< <dpavlin@rot13.o Line 249  Dobrica Pavlinusic, C<< <dpavlin@rot13.o
249    
250  =head1 COPYRIGHT & LICENSE  =head1 COPYRIGHT & LICENSE
251    
252  Copyright 2007 Dobrica Pavlinusic, All Rights Reserved.  Copyright 2007-8 Dobrica Pavlinusic, All Rights Reserved.
253    
254  This program is free software; you can redistribute it and/or modify it  This program is free software; you can redistribute it and/or modify it
255  under the same terms as Perl itself.  under the same terms as Perl itself.
256    
257  =cut  =cut
258    
259    package M6502::TieMem;
260    
261    use strict;
262    use warnings;
263    use Tie::Array;
264    use base qw(Tie::Array);
265    
266    #
267    sub TIEARRAY {
268            my $class = shift;
269    #       my $opt   = shift;
270    #       my $self  = { %$opt };
271            my $self = {};
272            bless($self, __PACKAGE__);
273            return $self;
274    }
275    
276    sub DESTROY {}
277    
278    #
279    sub FETCH {
280            my $self = shift;
281            my $n    = shift;
282            my $val = M6502::mem_peek( $n );
283            warn sprintf("FETCH %04x = %02x\n", $n, $val);
284            return $val;
285    }
286    
287    #
288    sub FETCHSIZE {
289            return 0xffff;
290    }
291    
292    #
293    sub STORE {
294            my $self = shift;
295            my $n    = shift;
296            my $val  = shift;
297            if ( $n > 0xffff ) {
298                    warn "over 64k: $n\n";
299                    return;
300            }
301            M6502::mem_poke( $n, $val );
302            warn sprintf("STORE %04x <- %02x\n",$n, $val);
303            return $val;
304    }
305    
306    #
307    sub STORESIZE {
308            die('not allowed (yet)');
309    }
310    
311    sub PUSH {
312            die('not allowed (yet)');
313    }
314    
315    sub POP {
316            die('not allowed (yet)');
317    }
318    
319    sub SHIFT {
320            die('not allowed (yet)');
321    }
322    
323    sub UNSHIFT {
324            die('not allowed (yet)');
325    }
326    
327    sub DELETE {
328            my $self = shift;
329            my $n    = shift;
330            $self->STORE($n, 0);
331    }
332    
333    sub EXISTS {
334            my $self = shift;
335            my $n    = shift;
336            return 0 if $n > 0xffff;
337            return 1;
338    }
339    
340  1;  1;
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