/[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 87 by dpavlin, Thu Aug 2 11:08:10 2007 UTC revision 96 by dpavlin, Thu Aug 2 13:58:26 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'dump_R @mem $PC $A $P $X $Y $S $IPeriod $ICount $IRequest $IAutoReset $TrapBadOps $Trap $Trace $run_for $debug';  our @EXPORT = qw'dump_R @mem $PC $A $P $X $Y $S $IPeriod $ICount $IRequest $IAutoReset $TrapBadOps $Trap $Trace $debug';
10  our $VERSION = '0.0.2';  our $VERSION = '0.0.2';
11  require XSLoader;  require XSLoader;
12  XSLoader::load('M6502', $VERSION);  XSLoader::load('M6502', $VERSION);
# Line 15  XSLoader::load('M6502', $VERSION); Line 15  XSLoader::load('M6502', $VERSION);
15    
16  M6502 - perl bindings for M6502 CPU emulator  M6502 - perl bindings for M6502 CPU emulator
17    
18    =head1 FUNCTIONS
19    
20  =cut  =cut
21    
22  our $debug = 0;  our $debug = 0;
# Line 34  our $TrapBadOps=1;     # Set to 1 to warn of Line 36  our $TrapBadOps=1;     # Set to 1 to warn of
36  our $Trap;                      # Set Trap to address to trace from  our $Trap;                      # Set Trap to address to trace from
37  our $Trace;                     # Set Trace=1 to start tracing  our $Trace;                     # Set Trace=1 to start tracing
38    
 # Exec6502 cycles  
 our $run_for = 0;  
   
 =head1 FUNCTIONS  
   
39  =head2 init  =head2 init
40    
41  Called before C<Run6502>  Setup read and write memory hooks (to implement memory mapped devices)
   
 =cut  
   
 sub init {  
         my $self = shift;  
         warn "inside init low-level M6502 from $self\n";  
 };  
   
 =head2 read  
   
 Read from memory  
42    
43    $byte = read( $address );    $init->(
44            read => sub {
45                    return $mem[$_[0]];
46            },
47            write => sub {
48                    $mem[$_[0]] = $_[1];
49            },
50      );
51    
52  =cut  =cut
53    
54  sub read {  our $_rw_hooks = {
55          my ($addr) = @_;          read => sub {
56          my $byte = $mem[$addr];                  warn sprintf("# callback read(%04x) not implemented\n", @_) if $debug;
57          warn "## M6502::read(",dump(@_),") = ",dump( $byte ),"\n" if $debug;                  return $mem[$_[0]];
58          return $byte;          },
59  }          write => sub {
60                    warn sprintf("# callback write(%04x,%02x) not implemented", @_) if $debug;
61  =head2 write                  $mem[$_[0]] = $_[1];
62            },
63  Write into emory  };
64    
65    write( $address, $byte );  sub init {
66            my $self = shift;
67            my $args = {@_};
68            warn "inside init low-level M6502 from ",ref($self),"\n";
69    
70  =cut          foreach my $p ( qw/read write/ ) {
71                    confess "need $p argument as coderef" unless ( $args->{$p} && ref($args->{$p}) eq 'CODE' );
72                    $_rw_hooks->{$p} = $args->{$p};
73            }
74    
75  sub write {  };
         warn "## M6502::write(",dump(@_),")\n" if $debug;  
         my ($addr,$byte) = @_;  
         $mem[$addr] = $byte;  
 }  
76    
77  =head2 poke_code  =head2 poke_code
78    
# Line 94  sub poke_code { Line 89  sub poke_code {
89          warn sprintf("## M6502::poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;          warn sprintf("## M6502::poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug;
90          #$mem[$addr++] = $_ foreach @_;          #$mem[$addr++] = $_ foreach @_;
91          # call low-level write          # call low-level write
92          Arch::write($addr++, $_) foreach @_;          $_rw_hooks->{write}->( $addr++, $_ ) foreach @_;
93  }  }
94    
95  =head2 ram  =head2 ram
# Line 126  sub write_chunk { Line 121  sub write_chunk {
121          splice @mem, $addr, $len, unpack('C*', $chunk);          splice @mem, $addr, $len, unpack('C*', $chunk);
122  }  }
123    
124  =head2 prompt  =head1 XS Callbacks
125    
126    This functions are called from C<M6502.xs>
127    
128  Call this after C<< $run_for >> cycles have been run on processor  =head2 _read
129    
130    Read from memory C callback
131    
132      $byte = M6502::_read( $address );
133    
134  =cut  =cut
135    
136  sub prompt {  sub _read {
137          warn "prompt -- you should override this\n";          return $_rw_hooks->{read}->( @_ );
138          return 1;  }
139    
140    =head2 _write
141    
142    Write into memory C callback
143    
144      M6502:_write( $address, $byte );
145    
146    =cut
147    
148    sub _write {
149            return $_rw_hooks->{write}->( @_ );
150  }  }
151    
152  =head2 _update_perl_R  =head2 _update_perl_R
# Line 149  sub _update_perl_R { Line 161  sub _update_perl_R {
161          dump_R();          dump_R();
162  }  }
163    
164    =head1 XS
165    
166    Following functions are implemented in C<M6502.xs> and exported to perl.
167    
168    =head2 set_debug
169    
170      M6502::set_debug( 0 );
171    
172    =head2 get_debug
173    
174      my $debug = M6502::set_debug();
175    
176    =head2 reset
177    
178    Reset 6502 CPU, reading PC from C<0xfffc>
179    
180      M6502::reset();
181    
182    =head2 update_C_R
183    
184    Push perl notion of register values to CPU emulator
185    
186      M6502::update_C_R();
187    
188    =head2 update_perl_R
189    
190    Update perl notion of register values
191    
192      M6502::update_perl_R();
193    
194    =head2 exec
195    
196    Execute cpu for specified number of cycles
197    
198      my $cycles_left = M6502::exec( $execute_cpu_cycles );
199    
200    =head1 Helpers
201    
202  =head2 dump_R  =head2 dump_R
203    
204  helper function which dumps registers in humanly readable form  helper function which dumps registers in humanly readable form
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