/[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 27 by dpavlin, Mon Jul 30 15:45:03 2007 UTC revision 51 by dpavlin, Tue Jul 31 12:35:02 2007 UTC
# Line 4  use strict; Line 4  use strict;
4  use warnings;  use warnings;
5    
6  use Data::Dump qw/dump/;  use Data::Dump qw/dump/;
7    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  # Dobrica Pavlinusic, <dpavlin@rot13.org> 07/30/07 13:23:19 CEST  =head1 NAME
 #  
 # Simple Orao emulation  
12    
13  my $debug = 1;  M6502 - perl bindings for 6502 emulator
14    
15  my @mem = (0x42) x 0x10000;     # 64M  =cut
16    
17    my $debug = 0;
18    
19    our $VERSION = qw(0.0.1);
20    
21    our @mem = (0xff) x 0x10000;    # 64M
22    
23  # program counter  # program counter
24  our $PC = 0xbeef;  our $PC = 0xbeef;
# Line 19  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 27  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 $self\n";
41  };  };
42    
43  =head2 read  =head2 read
# Line 42  Read from memory Line 51  Read from memory
51  sub read {  sub read {
52          my ($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 55  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
73    
74    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 );
78    
79    =cut
80    
81    sub poke_code {
82            my $self = shift;
83            my $addr = shift;
84            warn sprintf("## M6502::poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;
85            #$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
106    
107    Low-level update of memory, overriding user specified MMU functions C<read> and C<write>
108    
109      $emu->write_chunk( $address, $chunk_of_data );
110    
111    =cut
112    
113    sub write_chunk {
114            my ($self, $addr, $chunk) = @_;
115            my $len = length($chunk);
116            splice @mem, $addr, $len, unpack('C*', $chunk);
117    }
118    
119    =head2 prompt
120    
121    Call this after C<< $run_for >> cycles have been run on processor
122    
123    =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
135    
136    sub push_R {
137            warn "## M6502::push_R(",dump(@_),")\n" if $debug;
138            my ( $a, $p, $x, $y, $s, $pc ) = @_;
139            $PC = $pc;
140            $S=$s; $X=$x; $Y=$y; $P=$p; $A=$a;
141            dump_R();
142    }
143    
144    =head2 dump_R
145    
146    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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