/[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 26 by dpavlin, Mon Jul 30 14:23:22 2007 UTC revision 86 by dpavlin, Wed Aug 1 22:25:37 2007 UTC
# Line 3  package M6502; Line 3  package M6502;
3  use strict;  use strict;
4  use warnings;  use warnings;
5    
6  # Dobrica Pavlinusic, <dpavlin@rot13.org> 07/30/07 13:23:19 CEST  use Data::Dump qw/dump/;
7  #  use Carp qw/confess/;
8  # Simple Orao emulation  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  my $mem = (0) x 0x10000;        # 64M  =head1 NAME
15    
16    M6502 - perl bindings for M6502 CPU emulator
17    
18    =cut
19    
20    my $debug = 1;
21    
22    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 = 20000;  
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
54    
55    Read from memory
56    
57      $byte = read( $address );
58    
59    =cut
60    
61    sub read {
62            my ($addr) = @_;
63            my $byte = $mem[$addr];
64            warn "## M6502::read(",dump(@_),") = ",dump( $byte ),"\n" if $debug;
65            return $byte;
66    }
67    
68    =head2 write
69    
70    Write into emory
71    
72      write( $address, $byte );
73    
74    =cut
75    
76    sub write {
77            warn "## M6502::write(",dump(@_),")\n" if $debug;
78            my ($addr,$byte) = @_;
79            $mem[$addr] = $byte;
80    }
81    
82    =head2 poke_code
83    
84    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 );
88    
89    =cut
90    
91    sub poke_code {
92            my $self = shift;
93            my $addr = shift;
94            warn sprintf("## M6502::poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;
95            #$mem[$addr++] = $_ foreach @_;
96            # call low-level write
97            Arch::write($addr++, $_) foreach @_;
98    }
99    
100    =head2 ram
101    
102    Read series of bytes into memory without MMU interaction
103    
104      my @code = $emu->ram( 0xc000, 0xc1000 );
105    
106    =cut
107    
108    sub ram {
109            my $self = shift;
110            my ( $from, $to ) = @_;
111            warn sprintf("## M6502::ram(%04x,%04x)\n", $from, $to) if $self->debug;
112            return @mem[ $from .. $to ];
113    }
114    
115    =head2 write_chunk
116    
117    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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