/[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 86 by dpavlin, Wed Aug 1 22:25:37 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'dump_R @mem $PC $A $P $X $Y $S $IPeriod $ICount $IRequest $IAutoReset $TrapBadOps $Trap $Trace $run_for $debug';
10    our $VERSION = '0.0.2';
11    require XSLoader;
12    XSLoader::load('M6502', $VERSION);
13    
14  =head1 NAME  =head1 NAME
15    
16  M6502 - perl bindings for 6502 emulator  M6502 - perl bindings for M6502 CPU emulator
17    
18  =cut  =cut
19    
20  my $debug = 1;  my $debug = 1;
21    
 our $VERSION = qw(0.0.1);  
   
22  our @mem = (0xff) x 0x10000;    # 64M  our @mem = (0xff) x 0x10000;    # 64M
23    
24  # program counter  # program counter
25  our $PC = 0xbeef;  our $PC = 0xbeef;
26  # CPU registars  # CPU registars
27  our ( $A, $P, $X, $Y, $S ) = (0) x 5;  our ( $A, $P, $X, $Y, $S ) = (0) x 5;
 # Set IPeriod to number of CPU cycles between calls to Loop6502  
 our $IPeriod = 1;  
28    
29  =head1 init  our $IPeriod=1;         # Set IPeriod to number of CPU cycles between calls to Loop6502
30    our $ICount;
31    our $IRequest;          # Set to the INT_IRQ when pending IRQ
32    our $IAutoReset;        # Set to 1 to autom. reset IRequest
33    our $TrapBadOps=1;      # Set to 1 to warn of illegal opcodes
34    our $Trap;                      # Set Trap to address to trace from
35    our $Trace;                     # Set Trace=1 to start tracing
36    
37    # Exec6502 cycles
38    our $run_for = 0;
39    
40    =head1 FUNCTIONS
41    
42    =head2 init
43    
44  Called before C<Run6502>  Called before C<Run6502>
45    
46  =cut  =cut
47    
48  sub init {  sub init {
49          warn "inside init\n";          my $self = shift;
50          print "stdout\n";          warn "inside init low-level M6502 from $self\n";
51  };  };
52    
53  =head2 read  =head2 read
# Line 47  Read from memory Line 61  Read from memory
61  sub read {  sub read {
62          my ($addr) = @_;          my ($addr) = @_;
63          my $byte = $mem[$addr];          my $byte = $mem[$addr];
64          warn "# read(",dump(@_),") = ",dump( $byte ),"\n" if $debug;          warn "## M6502::read(",dump(@_),") = ",dump( $byte ),"\n" if $debug;
65          return $byte;          return $byte;
66  }  }
67    
# Line 60  Write into emory Line 74  Write into emory
74  =cut  =cut
75    
76  sub write {  sub write {
77          warn "# write(",dump(@_),")\n" if $debug;          warn "## M6502::write(",dump(@_),")\n" if $debug;
78          my ($addr,$byte) = @_;          my ($addr,$byte) = @_;
79          $mem[$addr] = $byte;          $mem[$addr] = $byte;
80  }  }
81    
82  =head2 poke_code  =head2 poke_code
83    
84  Write series of bytes into memory without passing through MMU  Write series of bytes into memory passing through MMU (C<read> and C<write>)
85    functions. If you don't want to trigger MMU, use C<write_chunk>.
86    
87    $emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa );    $emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa );
88    
# Line 76  Write series of bytes into memory withou Line 91  Write series of bytes into memory withou
91  sub poke_code {  sub poke_code {
92          my $self = shift;          my $self = shift;
93          my $addr = shift;          my $addr = shift;
94          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;
95          $mem[$addr++] = $_ foreach @_;          #$mem[$addr++] = $_ foreach @_;
96            # call low-level write
97            Arch::write($addr++, $_) foreach @_;
98  }  }
99    
100  =head2 ram  =head2 ram
101    
102  Read searies of bytes from memory without passing through MMU  Read series of bytes into memory without MMU interaction
103    
104    $emu->ram( $from, $to );    my @code = $emu->ram( 0xc000, 0xc1000 );
105    
106  =cut  =cut
107    
108  sub ram {  sub ram {
109          my $self = shift;          my $self = shift;
110          my ($from,$to) = @_;          my ( $from, $to ) = @_;
111          if ($from + $to) {          warn sprintf("## M6502::ram(%04x,%04x)\n", $from, $to) if $self->debug;
112                  printf "ram %04x - %04x\n", $from, $to;          return @mem[ $from .. $to ];
113                  return $mem[$from .. $to - 1];  }
114          }  
115          printf "ram %04x\n", $from;  =head2 write_chunk
116          return $mem[$from] if defined($from);  
117          confess "no from address";  Low-level update of memory, overriding user specified MMU functions C<read> and C<write>
118    
119      $emu->write_chunk( $address, $chunk_of_data );
120    
121    =cut
122    
123    sub write_chunk {
124            my ($self, $addr, $chunk) = @_;
125            my $len = length($chunk);
126            splice @mem, $addr, $len, unpack('C*', $chunk);
127    }
128    
129    =head2 prompt
130    
131    Call this after C<< $run_for >> cycles have been run on processor
132    
133    =cut
134    
135    sub prompt {
136            warn "prompt -- you should override this\n";
137            return 1;
138  }  }
139    
140    =head2 push_R
141    
142    called by C<perl.c> to push changes in registars back to perl variables
143    
144    =cut
145    
146    sub push_R {
147            warn "## M6502::push_R(",dump(@_),")\n" if $debug;
148            ( $A, $P, $X, $Y, $S, $PC, $IPeriod, $ICount, $IRequest, $IAutoReset, $TrapBadOps, $Trap, $Trace ) = @_;
149            dump_R();
150    }
151    
152    =head2 dump_R
153    
154    helper function which dumps registers in humanly readable form
155    
156      my $dump = dump_R;
157    
158    =cut
159    
160    sub dump_R {
161            my $dump = sprintf(" PC: %04x A:%02x P:%02x X:%02x Y:%02x S:%02x "
162                    . "IPeriod:%d ICount:%d IRequest:%02x IAutoReset:%02x TrapBadOps:%d Trap:%d Trace:%d"
163                    . "\n",
164                    $PC, $A, $P, $X, $Y, $S, $IPeriod, $ICount, $IRequest, $IAutoReset, $TrapBadOps, $Trap, $Trace,
165            );
166            warn "## M6502::dump_R $dump" if $debug;
167            return $dump;
168    }
169    
170    =head1 SEE ALSO
171    
172    L<Orao> is sample implementation using this module
173    
174    =head1 AUTHOR
175    
176    Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>
177    
178    =head1 COPYRIGHT & LICENSE
179    
180    Copyright 2007 Dobrica Pavlinusic, All Rights Reserved.
181    
182    This program is free software; you can redistribute it and/or modify it
183    under the same terms as Perl itself.
184    
185    =cut
186  1;  1;
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