/[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 30 by dpavlin, Mon Jul 30 17:56:13 2007 UTC revision 55 by dpavlin, Tue Jul 31 13:56:50 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'@mem $PC $A $P $X $Y $S $IPeriod $run_for $debug';
10    
11  =head1 NAME  =head1 NAME
12    
13  M6502 - perl bindings for 6502 emulator  M6502 - perl bindings for M6502 CPU emulator
14    
15  =cut  =cut
16    
17  my $debug = 1;  my $debug = 0;
18    
19  our $VERSION = qw(0.0.1);  our $VERSION = qw(0.0.1);
20    
# Line 24  our $PC = 0xbeef; Line 26  our $PC = 0xbeef;
26  our ( $A, $P, $X, $Y, $S ) = (0) x 5;  our ( $A, $P, $X, $Y, $S ) = (0) x 5;
27  # Set IPeriod to number of CPU cycles between calls to Loop6502  # Set IPeriod to number of CPU cycles between calls to Loop6502
28  our $IPeriod = 1;  our $IPeriod = 1;
29    # Exec6502 cycles
30    our $run_for = 0;
31    
32  =head1 init  =head1 FUNCTIONS
33    
34    =head2 init
35    
36  Called before C<Run6502>  Called before C<Run6502>
37    
38  =cut  =cut
39    
40  sub init {  sub init {
41          warn "inside init\n";          my $self = shift;
42          print "stdout\n";          warn "inside init low-level M6502 from $self\n";
43  };  };
44    
45  =head2 read  =head2 read
# Line 47  Read from memory Line 53  Read from memory
53  sub read {  sub read {
54          my ($addr) = @_;          my ($addr) = @_;
55          my $byte = $mem[$addr];          my $byte = $mem[$addr];
56          warn "# read(",dump(@_),") = ",dump( $byte ),"\n" if $debug;          warn "## M6502::read(",dump(@_),") = ",dump( $byte ),"\n" if $debug;
57          return $byte;          return $byte;
58  }  }
59    
# Line 60  Write into emory Line 66  Write into emory
66  =cut  =cut
67    
68  sub write {  sub write {
69          warn "# write(",dump(@_),")\n" if $debug;          warn "## M6502::write(",dump(@_),")\n" if $debug;
70          my ($addr,$byte) = @_;          my ($addr,$byte) = @_;
71          $mem[$addr] = $byte;          $mem[$addr] = $byte;
72  }  }
73    
74  =head2 poke_code  =head2 poke_code
75    
76  Write series of bytes into memory without passing through MMU  Write series of bytes into memory passing through MMU (C<read> and C<write>)
77    functions. If you don't want to trigger MMU, use C<write_chunk>.
78    
79    $emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa );    $emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa );
80    
# Line 76  Write series of bytes into memory withou Line 83  Write series of bytes into memory withou
83  sub poke_code {  sub poke_code {
84          my $self = shift;          my $self = shift;
85          my $addr = shift;          my $addr = shift;
86          warn sprintf("# poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;          warn sprintf("## M6502::poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;
87          $mem[$addr++] = $_ foreach @_;          #$mem[$addr++] = $_ foreach @_;
88            # call low-level write
89            Arch::write($addr++, $_) foreach @_;
90  }  }
91    
92  =head2 ram  =head2 ram
93    
94  Read searies of bytes from memory without passing through MMU  Read series of bytes into memory without MMU interaction
95    
96    $emu->ram( $from, $to );    my @code = $emu->ram( 0xc000, 0xc1000 );
97    
98  =cut  =cut
99    
100  sub ram {  sub ram {
101          my $self = shift;          my $self = shift;
102          my ($from,$to) = @_;          my ( $from, $to ) = @_;
103          if ($from + $to) {          warn sprintf("## M6502::ram(%04x,%04x)\n", $from, $to) if $self->debug;
104                  printf "ram %04x - %04x\n", $from, $to;          return @mem[ $from .. $to ];
105                  return $mem[$from .. $to - 1];  }
106          }  
107          printf "ram %04x\n", $from;  =head2 write_chunk
108          return $mem[$from] if defined($from);  
109          confess "no from address";  Low-level update of memory, overriding user specified MMU functions C<read> and C<write>
110    
111      $emu->write_chunk( $address, $chunk_of_data );
112    
113    =cut
114    
115    sub write_chunk {
116            my ($self, $addr, $chunk) = @_;
117            my $len = length($chunk);
118            splice @mem, $addr, $len, unpack('C*', $chunk);
119  }  }
120    
121    =head2 prompt
122    
123    Call this after C<< $run_for >> cycles have been run on processor
124    
125    =cut
126    
127    sub prompt {
128            warn "prompt -- you should override this\n";
129            return 1;
130    }
131    
132    =head2 push_R
133    
134    called by C<perl.c> to push changes in registars back to perl variables
135    
136    =cut
137    
138    sub push_R {
139            warn "## M6502::push_R(",dump(@_),")\n" if $debug;
140            my ( $a, $p, $x, $y, $s, $pc ) = @_;
141            $PC = $pc;
142            $S=$s; $X=$x; $Y=$y; $P=$p; $A=$a;
143            dump_R();
144    }
145    
146    =head2 dump_R
147    
148    helper function which dumps registers
149    
150    =cut
151    
152    sub dump_R {
153            warn sprintf("## M6502::dump_R PC: %04x A:%02x P:%02x X:%02x Y:%02x S:%02x\n", $PC, $A, $P, $X, $Y, $S) if $debug;
154    }
155    
156    =head1 SEE ALSO
157    
158    L<Orao> is sample implementation using this module
159    
160    =head1 AUTHOR
161    
162    Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>
163    
164    =head1 COPYRIGHT & LICENSE
165    
166    Copyright 2007 Dobrica Pavlinusic, All Rights Reserved.
167    
168    This program is free software; you can redistribute it and/or modify it
169    under the same terms as Perl itself.
170    
171    =cut
172  1;  1;
Legend:
Removed from v.30  
changed lines
  Added in v.55
  ViewVC Help
Powered by ViewVC 1.1.26