/[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 35 by dpavlin, Mon Jul 30 21:53:04 2007 UTC revision 51 by dpavlin, Tue Jul 31 12:35:02 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    
# Line 14  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 23  our @mem = (0xff) x 0x10000;   # 64M Line 23  our @mem = (0xff) x 0x10000;   # 64M
23  # program counter  # program counter
24  our $PC = 0xbeef;  our $PC = 0xbeef;
25  # CPU registars  # CPU registars
26  our ( $A, $P, $X, $Y, $S ) = (0x42) 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 35  Called before C<Run6502> Line 37  Called before C<Run6502>
37    
38  sub init {  sub init {
39          my $self = shift;          my $self = shift;
         warn dump(@_);  
40          warn "inside init low-level M6502 from $self\n";          warn "inside init low-level M6502 from $self\n";
41  };  };
42    
# Line 50  Read from memory Line 51  Read from memory
51  sub read {  sub read {
52          my ($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 63  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 79  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++] = $_ foreach @_;
86            # call low-level write
87            Arch::write($addr++, $_) foreach @_;
88    }
89    
90    =head2 ram
91    
92    Read series of bytes into memory without MMU interaction
93    
94      my @code = $emu->ram( 0xc000, 0xc1000 );
95    
96    =cut
97    
98    sub ram {
99            my $self = shift;
100            my ( $from, $to ) = @_;
101            warn sprintf("## M6502::ram(%04x,%04x)\n", $from, $to) if $self->debug;
102            return @mem[ $from .. $to ];
103  }  }
104    
105  =head2 write_chunk  =head2 write_chunk
106    
107    Low-level update of memory, overriding user specified MMU functions C<read> and C<write>
108    
109    $emu->write_chunk( $address, $chunk_of_data );    $emu->write_chunk( $address, $chunk_of_data );
110    
111  =cut  =cut
# Line 95  sub write_chunk { Line 116  sub write_chunk {
116          splice @mem, $addr, $len, unpack('C*', $chunk);          splice @mem, $addr, $len, unpack('C*', $chunk);
117  }  }
118    
119  =head2 ram  =head2 prompt
120    
121  Read searies of bytes from memory without passing through MMU  Call this after C<< $run_for >> cycles have been run on processor
122    
123    $emu->ram( $from, $to );  =cut
124    
125    sub prompt {
126            warn "prompt -- you should override this\n";
127            return 1;
128    }
129    
130    =head2 push_R
131    
132    called by C<perl.c> to push changes in registars back to perl variables
133    
134  =cut  =cut
135    
136  sub ram {  sub push_R {
137          my $self = shift;          warn "## M6502::push_R(",dump(@_),")\n" if $debug;
138          my ($from,$to) = @_;          my ( $a, $p, $x, $y, $s, $pc ) = @_;
139          warn "ram($from,$to)\n";          $PC = $pc;
140          if ($from + $to) {          $S=$s; $X=$x; $Y=$y; $P=$p; $A=$a;
141                  printf "ram %04x - %04x\n", $from, $to;          dump_R();
142                  return @mem[$from .. $to - 1];  }
143          }  
144          printf "ram %04x\n", $from;  =head2 dump_R
145          return $mem[$from] if defined($from);  
146          confess "no from address";  helper function which dumps registers
147    
148    =cut
149    
150    sub dump_R {
151            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;
152  }  }
153    
154  1;  1;
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