1 |
dpavlin |
24 |
package M6502; |
2 |
|
|
|
3 |
|
|
use strict; |
4 |
|
|
use warnings; |
5 |
|
|
|
6 |
dpavlin |
27 |
use Data::Dump qw/dump/; |
7 |
dpavlin |
29 |
use Carp qw/confess/; |
8 |
dpavlin |
34 |
use Exporter 'import'; |
9 |
dpavlin |
86 |
our @EXPORT = qw'dump_R @mem $PC $A $P $X $Y $S $IPeriod $ICount $IRequest $IAutoReset $TrapBadOps $Trap $Trace $run_for $debug'; |
10 |
dpavlin |
80 |
our $VERSION = '0.0.2'; |
11 |
|
|
require XSLoader; |
12 |
|
|
XSLoader::load('M6502', $VERSION); |
13 |
dpavlin |
27 |
|
14 |
dpavlin |
29 |
=head1 NAME |
15 |
dpavlin |
24 |
|
16 |
dpavlin |
54 |
M6502 - perl bindings for M6502 CPU emulator |
17 |
dpavlin |
29 |
|
18 |
dpavlin |
89 |
=head1 FUNCTIONS |
19 |
|
|
|
20 |
dpavlin |
29 |
=cut |
21 |
|
|
|
22 |
dpavlin |
87 |
our $debug = 0; |
23 |
dpavlin |
24 |
|
24 |
dpavlin |
29 |
our @mem = (0xff) x 0x10000; # 64M |
25 |
|
|
|
26 |
dpavlin |
25 |
# program counter |
27 |
dpavlin |
34 |
our $PC = 0xbeef; |
28 |
dpavlin |
25 |
# CPU registars |
29 |
dpavlin |
36 |
our ( $A, $P, $X, $Y, $S ) = (0) x 5; |
30 |
dpavlin |
74 |
|
31 |
|
|
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 |
dpavlin |
40 |
# Exec6502 cycles |
40 |
dpavlin |
42 |
our $run_for = 0; |
41 |
dpavlin |
24 |
|
42 |
dpavlin |
54 |
=head2 init |
43 |
|
|
|
44 |
dpavlin |
89 |
Setup read and write memory hooks (to implement memory mapped devices) |
45 |
dpavlin |
26 |
|
46 |
dpavlin |
89 |
$init->( |
47 |
|
|
read => sub { |
48 |
|
|
return $mem[$_[0]]; |
49 |
|
|
}, |
50 |
|
|
write => sub { |
51 |
|
|
$mem[$_[0]] = $_[1]; |
52 |
|
|
}, |
53 |
|
|
); |
54 |
|
|
|
55 |
dpavlin |
26 |
=cut |
56 |
|
|
|
57 |
dpavlin |
89 |
our $_rw_hooks = { |
58 |
|
|
read => sub { |
59 |
|
|
return $mem[$_[0]]; |
60 |
|
|
}, |
61 |
|
|
write => sub { |
62 |
|
|
$mem[$_[0]] = $_[1]; |
63 |
|
|
}, |
64 |
|
|
}; |
65 |
|
|
|
66 |
dpavlin |
26 |
sub init { |
67 |
dpavlin |
33 |
my $self = shift; |
68 |
dpavlin |
89 |
my $args = {@_}; |
69 |
|
|
warn "inside init low-level M6502 from ",ref($self),"\n"; |
70 |
dpavlin |
27 |
|
71 |
dpavlin |
89 |
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 |
dpavlin |
27 |
|
76 |
dpavlin |
89 |
}; |
77 |
dpavlin |
27 |
|
78 |
dpavlin |
29 |
=head2 poke_code |
79 |
|
|
|
80 |
dpavlin |
42 |
Write series of bytes into memory passing through MMU (C<read> and C<write>) |
81 |
|
|
functions. If you don't want to trigger MMU, use C<write_chunk>. |
82 |
dpavlin |
29 |
|
83 |
|
|
$emu->poke_code( 0xbeef, 0xff, 0x00, 0xff, 0x00, 0xaa ); |
84 |
|
|
|
85 |
|
|
=cut |
86 |
|
|
|
87 |
|
|
sub poke_code { |
88 |
|
|
my $self = shift; |
89 |
|
|
my $addr = shift; |
90 |
dpavlin |
50 |
warn sprintf("## M6502::poke_code(%04x,%s)\n", $addr, dump( @_ )) if $self->debug; |
91 |
dpavlin |
42 |
#$mem[$addr++] = $_ foreach @_; |
92 |
dpavlin |
51 |
# call low-level write |
93 |
dpavlin |
89 |
M6502::write($addr++, $_) foreach @_; |
94 |
dpavlin |
29 |
} |
95 |
|
|
|
96 |
dpavlin |
51 |
=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 |
dpavlin |
31 |
=head2 write_chunk |
112 |
|
|
|
113 |
dpavlin |
42 |
Low-level update of memory, overriding user specified MMU functions C<read> and C<write> |
114 |
|
|
|
115 |
dpavlin |
31 |
$emu->write_chunk( $address, $chunk_of_data ); |
116 |
|
|
|
117 |
|
|
=cut |
118 |
|
|
|
119 |
|
|
sub write_chunk { |
120 |
|
|
my ($self, $addr, $chunk) = @_; |
121 |
|
|
my $len = length($chunk); |
122 |
|
|
splice @mem, $addr, $len, unpack('C*', $chunk); |
123 |
|
|
} |
124 |
|
|
|
125 |
dpavlin |
42 |
=head2 prompt |
126 |
|
|
|
127 |
|
|
Call this after C<< $run_for >> cycles have been run on processor |
128 |
|
|
|
129 |
|
|
=cut |
130 |
|
|
|
131 |
|
|
sub prompt { |
132 |
|
|
warn "prompt -- you should override this\n"; |
133 |
|
|
return 1; |
134 |
|
|
} |
135 |
|
|
|
136 |
dpavlin |
89 |
=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 |
147 |
|
|
|
148 |
|
|
sub _read { |
149 |
|
|
return $_rw_hooks->{read}->( @_ ); |
150 |
|
|
} |
151 |
|
|
|
152 |
|
|
=head2 _write |
153 |
|
|
|
154 |
|
|
Write into memory C callback |
155 |
|
|
|
156 |
|
|
M6502:_write( $address, $byte ); |
157 |
|
|
|
158 |
|
|
=cut |
159 |
|
|
|
160 |
|
|
sub _write { |
161 |
|
|
return $_rw_hooks->{write}->( @_ ); |
162 |
|
|
} |
163 |
|
|
|
164 |
dpavlin |
87 |
=head2 _update_perl_R |
165 |
dpavlin |
38 |
|
166 |
dpavlin |
87 |
called by C<M6502.xs> to push changes in registars back to perl variables |
167 |
dpavlin |
38 |
|
168 |
|
|
=cut |
169 |
|
|
|
170 |
dpavlin |
87 |
sub _update_perl_R { |
171 |
|
|
warn "## M6502::update_perl_R(",dump(@_),")\n" if $debug; |
172 |
dpavlin |
74 |
( $A, $P, $X, $Y, $S, $PC, $IPeriod, $ICount, $IRequest, $IAutoReset, $TrapBadOps, $Trap, $Trace ) = @_; |
173 |
dpavlin |
38 |
dump_R(); |
174 |
|
|
} |
175 |
|
|
|
176 |
|
|
=head2 dump_R |
177 |
|
|
|
178 |
dpavlin |
68 |
helper function which dumps registers in humanly readable form |
179 |
dpavlin |
38 |
|
180 |
dpavlin |
68 |
my $dump = dump_R; |
181 |
|
|
|
182 |
dpavlin |
38 |
=cut |
183 |
|
|
|
184 |
|
|
sub dump_R { |
185 |
dpavlin |
74 |
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 |
dpavlin |
68 |
warn "## M6502::dump_R $dump" if $debug; |
191 |
|
|
return $dump; |
192 |
dpavlin |
38 |
} |
193 |
|
|
|
194 |
dpavlin |
87 |
=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 |
dpavlin |
55 |
=head1 SEE ALSO |
216 |
dpavlin |
54 |
|
217 |
dpavlin |
55 |
L<Orao> is sample implementation using this module |
218 |
|
|
|
219 |
dpavlin |
54 |
=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 |
dpavlin |
24 |
1; |