/[VRac]/M6502/M6502.pm
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revision 42 by dpavlin, Tue Jul 31 09:37:01 2007 UTC revision 89 by dpavlin, Thu Aug 2 12:01:09 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 $run_for';  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  =head1 FUNCTIONS
19    
20  my $debug = 1;  =cut
21    
22  our $VERSION = qw(0.0.1);  our $debug = 0;
23    
24  our @mem = (0xff) x 0x10000;    # 64M  our @mem = (0xff) x 0x10000;    # 64M
25    
# Line 24  our @mem = (0xff) x 0x10000;   # 64M Line 27  our @mem = (0xff) x 0x10000;   # 64M
27  our $PC = 0xbeef;  our $PC = 0xbeef;
28  # CPU registars  # CPU registars
29  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;  
 # Exec6502 cycles  
 our $run_for = 0;  
   
 =head1 init  
30    
31  Called before C<Run6502>  our $IPeriod=1;         # Set IPeriod to number of CPU cycles between calls to Loop6502
32    our $ICount;
33    our $IRequest;          # Set to the INT_IRQ when pending IRQ
34    our $IAutoReset;        # Set to 1 to autom. reset IRequest
35    our $TrapBadOps=1;      # Set to 1 to warn of illegal opcodes
36    our $Trap;                      # Set Trap to address to trace from
37    our $Trace;                     # Set Trace=1 to start tracing
38    
39  =cut  # Exec6502 cycles
40    our $run_for = 0;
 sub init {  
         my $self = shift;  
         warn dump(@_);  
         warn "inside init low-level M6502 from $self\n";  
 };  
41    
42  =head2 read  =head2 init
43    
44  Read from memory  Setup read and write memory hooks (to implement memory mapped devices)
45    
46    $byte = read( $address );    $init->(
47            read => sub {
48                    return $mem[$_[0]];
49            },
50            write => sub {
51                    $mem[$_[0]] = $_[1];
52            },
53      );
54    
55  =cut  =cut
56    
57  sub read {  our $_rw_hooks = {
58          my ($addr) = @_;          read => sub {
59          my $byte = $mem[$addr];                  return $mem[$_[0]];
60          warn "# read(",dump(@_),") = ",dump( $byte ),"\n" if $debug;          },
61          return $byte;          write => sub {
62  }                  $mem[$_[0]] = $_[1];
63            },
64  =head2 write  };
   
 Write into emory  
65    
66    write( $address, $byte );  sub init {
67            my $self = shift;
68            my $args = {@_};
69            warn "inside init low-level M6502 from ",ref($self),"\n";
70    
71  =cut          foreach my $p ( qw/read write/ ) {
72                    confess "need $p argument as coderef" unless ( $args->{$p} && ref($args->{$p}) eq 'CODE' );
73                    $_rw_hooks->{$p} = $args->{$p};
74            }
75    
76  sub write {  };
         warn "# write(",dump(@_),")\n" if $debug;  
         my ($addr,$byte) = @_;  
         $mem[$addr] = $byte;  
 }  
77    
78  =head2 poke_code  =head2 poke_code
79    
# Line 82  functions. If you don't want to trigger Line 87  functions. If you don't want to trigger
87  sub poke_code {  sub poke_code {
88          my $self = shift;          my $self = shift;
89          my $addr = shift;          my $addr = shift;
90          warn sprintf("# poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;          warn sprintf("## M6502::poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;
91          #$mem[$addr++] = $_ foreach @_;          #$mem[$addr++] = $_ foreach @_;
92          $self->write($addr++, $_) foreach @_;          # call low-level write
93            M6502::write($addr++, $_) foreach @_;
94    }
95    
96    =head2 ram
97    
98    Read series of bytes into memory without MMU interaction
99    
100      my @code = $emu->ram( 0xc000, 0xc1000 );
101    
102    =cut
103    
104    sub ram {
105            my $self = shift;
106            my ( $from, $to ) = @_;
107            warn sprintf("## M6502::ram(%04x,%04x)\n", $from, $to) if $self->debug;
108            return @mem[ $from .. $to ];
109  }  }
110    
111  =head2 write_chunk  =head2 write_chunk
# Line 101  sub write_chunk { Line 122  sub write_chunk {
122          splice @mem, $addr, $len, unpack('C*', $chunk);          splice @mem, $addr, $len, unpack('C*', $chunk);
123  }  }
124    
125  =head2 ram  =head2 prompt
126    
127  Read searies of bytes from memory without passing through MMU  Call this after C<< $run_for >> cycles have been run on processor
128    
129    $emu->ram( $from, $to );  =cut
130    
131    sub prompt {
132            warn "prompt -- you should override this\n";
133            return 1;
134    }
135    
136    =head1 XS Callbacks
137    
138    This functions are called from C<M6502.xs>
139    
140    =head2 _read
141    
142    Read from memory C callback
143    
144      $byte = M6502::_read( $address );
145    
146  =cut  =cut
147    
148  sub ram {  sub _read {
149          my $self = shift;          return $_rw_hooks->{read}->( @_ );
         my ($from,$to) = @_;  
         warn "ram($from,$to)\n";  
         if ($from + $to) {  
                 printf "ram %04x - %04x\n", $from, $to;  
                 return @mem[$from .. $to - 1];  
         }  
         printf "ram %04x\n", $from;  
         return $mem[$from] if defined($from);  
         confess "no from address";  
150  }  }
151    
152  =head2 prompt  =head2 _write
153    
154  Call this after C<< $run_for >> cycles have been run on processor  Write into memory C callback
155    
156      M6502:_write( $address, $byte );
157    
158  =cut  =cut
159    
160  sub prompt {  sub _write {
161          warn "prompt -- you should override this\n";          return $_rw_hooks->{write}->( @_ );
         return 1;  
162  }  }
163    
164  =head2 push_R  =head2 _update_perl_R
165    
166  called by C<perl.c> to push changes in registars back to perl variables  called by C<M6502.xs> to push changes in registars back to perl variables
167    
168  =cut  =cut
169    
170  sub push_R {  sub _update_perl_R {
171          warn "push_R(",dump(@_),")\n";          warn "## M6502::update_perl_R(",dump(@_),")\n" if $debug;
172          my ( $a, $p, $x, $y, $s, $pc ) = @_;          ( $A, $P, $X, $Y, $S, $PC, $IPeriod, $ICount, $IRequest, $IAutoReset, $TrapBadOps, $Trap, $Trace ) = @_;
         $PC = $pc;  
         $S=$s; $X=$x; $Y=$y; $P=$p; $A=$a;  
173          dump_R();          dump_R();
174  }  }
175    
176  =head2 dump_R  =head2 dump_R
177    
178  helper function which dumps registers  helper function which dumps registers in humanly readable form
179    
180      my $dump = dump_R;
181    
182  =cut  =cut
183    
184  sub dump_R {  sub dump_R {
185          warn sprintf("PC: %04x A:%02x P:%02x X:%02x Y:%02x S:%02x\n", $PC, $A, $P, $X, $Y, $S);          my $dump = sprintf(" PC: %04x A:%02x P:%02x X:%02x Y:%02x S:%02x "
186                    . "IPeriod:%d ICount:%d IRequest:%02x IAutoReset:%02x TrapBadOps:%d Trap:%d Trace:%d"
187                    . "\n",
188                    $PC, $A, $P, $X, $Y, $S, $IPeriod, $ICount, $IRequest, $IAutoReset, $TrapBadOps, $Trap, $Trace,
189            );
190            warn "## M6502::dump_R $dump" if $debug;
191            return $dump;
192    }
193    
194    =head2 debug
195    
196    Turn perl and C-level debugging on/off
197    
198      $emu->debug( 0 );
199      $emu->debug( 1 );
200      print $emu->debug;
201    
202    =cut
203    
204    sub debug {
205            my $self = shift;
206            my $value = shift;
207            if (defined($value)) {
208                    $debug = M6502::set_debug($value);
209            } else {
210                    $debug = M6502::get_debug();
211            }
212            return $debug;
213  }  }
214    
215    =head1 SEE ALSO
216    
217    L<Orao> is sample implementation using this module
218    
219    =head1 AUTHOR
220    
221    Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >>
222    
223    =head1 COPYRIGHT & LICENSE
224    
225    Copyright 2007 Dobrica Pavlinusic, All Rights Reserved.
226    
227    This program is free software; you can redistribute it and/or modify it
228    under the same terms as Perl itself.
229    
230    =cut
231  1;  1;
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