/[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 89 by dpavlin, Thu Aug 2 12:01:09 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 36  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;  
   
39  =head2 init  =head2 init
40    
41  Setup read and write memory hooks (to implement memory mapped devices)  Setup read and write memory hooks (to implement memory mapped devices)
# Line 56  Setup read and write memory hooks (to im Line 53  Setup read and write memory hooks (to im
53    
54  our $_rw_hooks = {  our $_rw_hooks = {
55          read => sub {          read => sub {
56                    warn sprintf("# callback read(%04x) not implemented\n", @_) if $debug;
57                  return $mem[$_[0]];                  return $mem[$_[0]];
58          },          },
59          write => sub {          write => sub {
60                    warn sprintf("# callback write(%04x,%02x) not implemented", @_) if $debug;
61                  $mem[$_[0]] = $_[1];                  $mem[$_[0]] = $_[1];
62          },          },
63  };  };
# Line 90  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++] = $_ foreach @_;
91          # call low-level write          # call low-level write
92          M6502::write($addr++, $_) foreach @_;          $_rw_hooks->{write}->( $addr++, $_ ) foreach @_;
93  }  }
94    
95  =head2 ram  =head2 ram
# Line 122  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    
 =head2 prompt  
   
 Call this after C<< $run_for >> cycles have been run on processor  
   
 =cut  
   
 sub prompt {  
         warn "prompt -- you should override this\n";  
         return 1;  
 }  
   
124  =head1 XS Callbacks  =head1 XS Callbacks
125    
126  This functions are called from C<M6502.xs>  This functions are called from C<M6502.xs>
# Line 173  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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