/[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 38 by dpavlin, Mon Jul 30 23:28:25 2007 UTC revision 54 by dpavlin, Tue Jul 31 13:35:02 2007 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';  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 26  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    
# Line 35  Called before C<Run6502> Line 39  Called before C<Run6502>
39    
40  sub init {  sub init {
41          my $self = shift;          my $self = shift;
         warn dump(@_);  
42          warn "inside init low-level M6502 from $self\n";          warn "inside init low-level M6502 from $self\n";
43  };  };
44    
# Line 50  Read from memory Line 53  Read from memory
53  sub read {  sub read {
54          my ($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 63  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 79  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
93    
94    Read series of bytes into memory without MMU interaction
95    
96      my @code = $emu->ram( 0xc000, 0xc1000 );
97    
98    =cut
99    
100    sub ram {
101            my $self = shift;
102            my ( $from, $to ) = @_;
103            warn sprintf("## M6502::ram(%04x,%04x)\n", $from, $to) if $self->debug;
104            return @mem[ $from .. $to ];
105  }  }
106    
107  =head2 write_chunk  =head2 write_chunk
108    
109    Low-level update of memory, overriding user specified MMU functions C<read> and C<write>
110    
111    $emu->write_chunk( $address, $chunk_of_data );    $emu->write_chunk( $address, $chunk_of_data );
112    
113  =cut  =cut
# Line 95  sub write_chunk { Line 118  sub write_chunk {
118          splice @mem, $addr, $len, unpack('C*', $chunk);          splice @mem, $addr, $len, unpack('C*', $chunk);
119  }  }
120    
121  =head2 ram  =head2 prompt
   
 Read searies of bytes from memory without passing through MMU  
122    
123    $emu->ram( $from, $to );  Call this after C<< $run_for >> cycles have been run on processor
124    
125  =cut  =cut
126    
127  sub ram {  sub prompt {
128          my $self = shift;          warn "prompt -- you should override this\n";
129          my ($from,$to) = @_;          return 1;
         warn "ram($from,$to)\n";  
         if ($from + $to) {  
                 printf "ram %04x - %04x\n", $from, $to;  
                 return @mem[$from .. $to - 1];  
         }  
         printf "ram %04x\n", $from;  
         return $mem[$from] if defined($from);  
         confess "no from address";  
130  }  }
131    
132  =head2 push_R  =head2 push_R
# Line 123  called by C<perl.c> to push changes in r Line 136  called by C<perl.c> to push changes in r
136  =cut  =cut
137    
138  sub push_R {  sub push_R {
139          warn "push_R(",dump(@_),")\n";          warn "## M6502::push_R(",dump(@_),")\n" if $debug;
140          my ( $a, $p, $x, $y, $s, $pc ) = @_;          my ( $a, $p, $x, $y, $s, $pc ) = @_;
141          $PC = $pc;          $PC = $pc;
142          $S=$s; $X=$x; $Y=$y; $P=$p; $A=$a;          $S=$s; $X=$x; $Y=$y; $P=$p; $A=$a;
# Line 137  helper function which dumps registers Line 150  helper function which dumps registers
150  =cut  =cut
151    
152  sub dump_R {  sub dump_R {
153          warn sprintf("PC: %04x A:%02x P:%02x X:%02x Y:%02x S:%02x\n", $PC, $A, $P, $X, $Y, $S);          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    
157    =head1 AUTHOR
158    
159    Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>
160    
161    =head1 COPYRIGHT & LICENSE
162    
163    Copyright 2007 Dobrica Pavlinusic, All Rights Reserved.
164    
165    This program is free software; you can redistribute it and/or modify it
166    under the same terms as Perl itself.
167    
168    =cut
169  1;  1;
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