/[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!
ViewVC logotype

Diff of /M6502/M6502.pm

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 89 by dpavlin, Thu Aug 2 12:01:09 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'dump_R @mem $PC $A $P $X $Y $S $IPeriod $ICount $IRequest $IAutoReset $TrapBadOps $Trap $Trace $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 = '0.0.2';  our $VERSION = '0.0.3';
11  require XSLoader;  require XSLoader;
12  XSLoader::load('M6502', $VERSION);  XSLoader::load('M6502', $VERSION);
13    
# Line 21  M6502 - perl bindings for M6502 CPU emul Line 21  M6502 - perl bindings for M6502 CPU emul
21    
22  our $debug = 0;  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;
# Line 36  our $TrapBadOps=1;     # Set to 1 to warn of Line 37  our $TrapBadOps=1;     # Set to 1 to warn of
37  our $Trap;                      # Set Trap to address to trace from  our $Trap;                      # Set Trap to address to trace from
38  our $Trace;                     # Set Trace=1 to start tracing  our $Trace;                     # Set Trace=1 to start tracing
39    
 # Exec6502 cycles  
 our $run_for = 0;  
   
40  =head2 init  =head2 init
41    
42  Setup read and write memory hooks (to implement memory mapped devices)  Setup read and write memory hooks (to implement memory mapped devices)
# Line 56  Setup read and write memory hooks (to im Line 54  Setup read and write memory hooks (to im
54    
55  our $_rw_hooks = {  our $_rw_hooks = {
56          read => sub {          read => sub {
57                    warn sprintf("# callback read(%04x) not implemented\n", @_) if $debug;
58                  return $mem[$_[0]];                  return $mem[$_[0]];
59          },          },
60          write => sub {          write => sub {
61                    warn sprintf("# callback write(%04x,%02x) not implemented", @_) if $debug;
62                  $mem[$_[0]] = $_[1];                  $mem[$_[0]] = $_[1];
63          },          },
64  };  };
# Line 90  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++] = $_ foreach @_;
92          # call low-level write          # call low-level write
93          M6502::write($addr++, $_) foreach @_;          $_rw_hooks->{write}->( $addr++, $_ ) foreach @_;
94  }  }
95    
96  =head2 ram  =head2 ram
# Line 122  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    
 =head2 prompt  
   
 Call this after C<< $run_for >> cycles have been run on processor  
   
 =cut  
   
 sub prompt {  
         warn "prompt -- you should override this\n";  
         return 1;  
 }  
   
125  =head1 XS Callbacks  =head1 XS Callbacks
126    
127  This functions are called from C<M6502.xs>  This functions are called from C<M6502.xs>
# Line 173  sub _update_perl_R { Line 162  sub _update_perl_R {
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 222  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;
Legend:
Removed from v.89  
changed lines
  Added in v.203
  ViewVC Help
Powered by ViewVC 1.1.26