/[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 50 by dpavlin, Tue Jul 31 11:14:19 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    
# Line 12  M6502 - perl bindings for 6502 emulator Line 14  M6502 - perl bindings for 6502 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 init
33    
# Line 32  Called before C<Run6502> Line 36  Called before C<Run6502>
36  =cut  =cut
37    
38  sub init {  sub init {
39          warn "inside init\n";          my $self = shift;
40          print "stdout\n";          warn "inside init low-level M6502 from $self\n";
41  };  };
42    
43  =head2 read  =head2 read
# Line 47  Read from memory Line 51  Read from memory
51  sub read {  sub read {
52          my ($addr) = @_;          my ($addr) = @_;
53          my $byte = $mem[$addr];          my $byte = $mem[$addr];
54          warn "# read(",dump(@_),") = ",dump( $byte ),"\n" if $debug;          warn "## M6502::read(",dump(@_),") = ",dump( $byte ),"\n" if $debug;
55          return $byte;          return $byte;
56  }  }
57    
# Line 60  Write into emory Line 64  Write into emory
64  =cut  =cut
65    
66  sub write {  sub write {
67          warn "# write(",dump(@_),")\n" if $debug;          warn "## M6502::write(",dump(@_),")\n" if $debug;
68          my ($addr,$byte) = @_;          my ($addr,$byte) = @_;
69          $mem[$addr] = $byte;          $mem[$addr] = $byte;
70  }  }
71    
72  =head2 poke_code  =head2 poke_code
73    
74  Write series of bytes into memory without passing through MMU  Write series of bytes into memory passing through MMU (C<read> and C<write>)
75    functions. If you don't want to trigger MMU, use C<write_chunk>.
76    
77    $emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa );    $emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa );
78    
# Line 76  Write series of bytes into memory withou Line 81  Write series of bytes into memory withou
81  sub poke_code {  sub poke_code {
82          my $self = shift;          my $self = shift;
83          my $addr = shift;          my $addr = shift;
84          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;
85          $mem[$addr++] = $_ foreach @_;          #$mem[$addr++] = $_ foreach @_;
86            $self->write($addr++, $_) foreach @_;
87  }  }
88    
89  =head2 ram  =head2 write_chunk
90    
91  Read searies of bytes from memory without passing through MMU  Low-level update of memory, overriding user specified MMU functions C<read> and C<write>
92    
93    $emu->ram( $from, $to );    $emu->write_chunk( $address, $chunk_of_data );
94    
95  =cut  =cut
96    
97  sub ram {  sub write_chunk {
98          my $self = shift;          my ($self, $addr, $chunk) = @_;
99          my ($from,$to) = @_;          my $len = length($chunk);
100          if ($from + $to) {          splice @mem, $addr, $len, unpack('C*', $chunk);
101                  printf "ram %04x - %04x\n", $from, $to;  }
102                  return $mem[$from .. $to - 1];  
103          }  =head2 prompt
104          printf "ram %04x\n", $from;  
105          return $mem[$from] if defined($from);  Call this after C<< $run_for >> cycles have been run on processor
106          confess "no from address";  
107    =cut
108    
109    sub prompt {
110            warn "prompt -- you should override this\n";
111            return 1;
112    }
113    
114    =head2 push_R
115    
116    called by C<perl.c> to push changes in registars back to perl variables
117    
118    =cut
119    
120    sub push_R {
121            warn "## M6502::push_R(",dump(@_),")\n" if $debug;
122            my ( $a, $p, $x, $y, $s, $pc ) = @_;
123            $PC = $pc;
124            $S=$s; $X=$x; $Y=$y; $P=$p; $A=$a;
125            dump_R();
126    }
127    
128    =head2 dump_R
129    
130    helper function which dumps registers
131    
132    =cut
133    
134    sub dump_R {
135            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;
136  }  }
137    
138  1;  1;
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