/[VRac]/M6502/M6502.pm
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revision 68 by dpavlin, Tue Jul 31 17:15:54 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'@mem $PC $A $P $X $Y $S $IPeriod $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';
11    require XSLoader;
12    XSLoader::load('M6502', $VERSION);
13    
14  =head1 NAME  =head1 NAME
15    
16  M6502 - perl bindings for M6502 CPU emulator  M6502 - perl bindings for M6502 CPU emulator
17    
18  =cut  =head1 FUNCTIONS
19    
20  my $debug = 0;  =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;  
30    
31  =head1 FUNCTIONS  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  =head2 init  =head2 init
40    
41  Called before C<Run6502>  Setup read and write memory hooks (to implement memory mapped devices)
42    
43  =cut    $init->(
44            read => sub {
45  sub init {                  return $mem[$_[0]];
46          my $self = shift;          },
47          warn "inside init low-level M6502 from $self\n";          write => sub {
48  };                  $mem[$_[0]] = $_[1];
49            },
50  =head2 read    );
   
 Read from memory  
   
   $byte = read( $address );  
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 86  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 118  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    =head2 _read
129    
130    Read from memory C callback
131    
132      $byte = M6502::_read( $address );
133    
134    =cut
135    
136    sub _read {
137            return $_rw_hooks->{read}->( @_ );
138    }
139    
140    =head2 _write
141    
142    Write into memory C callback
143    
144  Call this after C<< $run_for >> cycles have been run on processor    M6502:_write( $address, $byte );
145    
146  =cut  =cut
147    
148  sub prompt {  sub _write {
149          warn "prompt -- you should override this\n";          return $_rw_hooks->{write}->( @_ );
         return 1;  
150  }  }
151    
152  =head2 push_R  =head2 _update_perl_R
153    
154  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
155    
156  =cut  =cut
157    
158  sub push_R {  sub _update_perl_R {
159          warn "## M6502::push_R(",dump(@_),")\n" if $debug;          warn "## M6502::update_perl_R(",dump(@_),")\n" if $debug;
160          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;  
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
# Line 152  helper function which dumps registers in Line 208  helper function which dumps registers in
208  =cut  =cut
209    
210  sub dump_R {  sub dump_R {
211          my $dump = 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 "
212                    . "IPeriod:%d ICount:%d IRequest:%02x IAutoReset:%02x TrapBadOps:%d Trap:%d Trace:%d"
213                    . "\n",
214                    $PC, $A, $P, $X, $Y, $S, $IPeriod, $ICount, $IRequest, $IAutoReset, $TrapBadOps, $Trap, $Trace,
215            );
216          warn "## M6502::dump_R $dump" if $debug;          warn "## M6502::dump_R $dump" if $debug;
217          return $dump;          return $dump;
218  }  }
219    
220    =head2 debug
221    
222    Turn perl and C-level debugging on/off
223    
224      $emu->debug( 0 );
225      $emu->debug( 1 );
226      print $emu->debug;
227    
228    =cut
229    
230    sub debug {
231            my $self = shift;
232            my $value = shift;
233            if (defined($value)) {
234                    $debug = M6502::set_debug($value);
235            } else {
236                    $debug = M6502::get_debug();
237            }
238            return $debug;
239    }
240    
241  =head1 SEE ALSO  =head1 SEE ALSO
242    
243  L<Orao> is sample implementation using this module  L<Orao> is sample implementation using this module
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