+#!/usr/bin/env perl
+
+ use v5.010.000;
+ use warnings;
+ use strict;
+
+# say "Hello World!";
+
+# print $ARGV[ 1 ];
+
+# Including stuff we don't need, in case I get ambitious.
+# Not including 6801 at this point.
+
+# Branches are completely unchanged going from 6800 to 6809:
+my $branchlist = "BCC|BCS|BEQ|BGE|BGT|BHI|BLE|BLS|BLT|BMI|BNE|BPL|BRA|BVC|BVS";
+
+# These implicit ops are unchanged from 6800 to 6809:
+my $implist = "DAA|NOP|RTS";
+
+# 16-bit pseudo-binary, unchanged from 6800 to 6809:
+my $jumplist ="JMP|JSR";
+
+# 8-bit binary ops are unchanged going from 6800 to 6809,
+# but we'll eliminate optional space for sociability:
+my $binop8list = "ADC|ADD|AND|BIT|CMP|EOR|SBC|SUB";
+
+# 8-bit unary ops are unchanged going from 6800to 6809,
+# but we'll eliminate optional space for sociability:
+my $unoplist = "ASL|ASR|CLR|COM|DEC|INC|LSR|LSL|NEG|ROL|ROR|TST";
+
+# These binary 8-bits have one too many As from 6800 to 6809:
+my $binopLDORST8list = "LDA|ORA|STA";
+
+# These loads and stores are unchanged from 6800 to 6809,
+# except for optional space:
+my $binopLDST16list = "LDS|LDX|STS|STX";
+
+# Form changes to CMPX
+my $binop16list = "CPX";
+
+# Push and pop (pull) are generalized:
+# (6800 had no pshx! -- But fixed in 6801.)
+my $pushmepullyoulist = "PSH|PUL";
+
+# Transfers are generalized:
+my $transferlist = "TAB|TAP|TBA|TPA|TSX|TXS";
+
+# These convert to LEA instructions:
+my $lealist = "DES|DEX|INS|INX";
+
+# Processor status bit handling is generalized:
+# my $flaghandlerlist = "CLC|CLI|CLV|SEC|SEI|SEV";
+my $flaghandleroplist = "CL|SE";
+my $flaghandlerbitlist = "[CIV]";
+
+# Special handling for inter-accumulator:
+my $b2alist = "ABA|CBA|SBA";
+
+# Interrupt stuff, form remains the same, different register set,
+# flag working on by hand:
+my $interruptstufflist = "RTI|SWI";
+
+# Interrupt wait, form changes, semantics change,
+# flag for working on by hand:
+my $waitstufflist = "WAI";
+
+while ( my $line = <> )
+{
+ if ( $line =~ m/^(\w*)\s+FCC\s+(\d+),(.*)$/ )
+ {
+ my $label = $1;
+ my $symlength = $2;
+ my $strfield = $3;
+ my $symbol = substr( $strfield, 0, $symlength );
+ my $leftovers = substr( $strfield, $symlength );
+ my $strlength = length( $symbol );
+ if ( $strlength < $symlength )
+ {
+ print "$label\tFCC error\t'$symbol' not complete to "
+ . "$symlength characters (only $strlength). ****error***";
+ }
+ else
+ {
+ my $fullsymbol = $symbol;
+ if ( $leftovers =~ m/^(\S+)(.*)$/ )
+ {
+ $fullsymbol .= $1;
+ $leftovers = $2;
+ }
+ print "$label\tFCC\t'$symbol'\t; '$fullsymbol'";
+ }
+
+ if ( length( $leftovers ) > 0 )
+ {
+ print " : $leftovers";
+ }
+ print "\n";
+ }
+ elsif ( $line =~ m/^(\w*)\s+(${pushmepullyoulist})\s*(A|B)\s*(.*)$/ )
+ {
+ my $label = $1;
+ my $operator = $2;
+ my $operand = $3;
+ my $comments = $4;
+ print "$label\t${operator}S $operand\t; $comments\n";
+ }
+ elsif ( $line =~ m/^(\w*)\s+(${binopLDORST8list})\s*(A|B)\s+(.*)$/ )
+ {
+ my $label = $1;
+ my $operator = $2;
+ my $operand = $3;
+ my $comments = $4; # Fudging, comments includes memory operand.
+ my $op2letter = substr( $operator, 0, 2 );
+ print "$label\t${op2letter}$operand $comments\n";
+ }
+ elsif ( $line =~ m/^(\w*)\s+(${lealist})(.*)$/ )
+ {
+ my $label = $1;
+ my $operator = $2;
+ my $comments = $3;
+ if ( $operator =~ m/IN(\w)/ )
+ { $operator = "LEA$1 1,$1";
+ }
+ elsif ( $operator =~ m/DE(\w)/ )
+ { $operator = "LEA$1 -1,$1";
+ }
+ print "$label\t${operator}\t; $comments\n";
+ }
+ elsif ( $line =~ m/^(\w*)\s+(${unoplist})\s*(A|B)(.*)$/ )
+ {
+ my $label = $1;
+ my $operator = $2;
+ my $operand = $3;
+ my $comments = $4;
+ print "$label\t$operator$operand\t;$comments\n";
+ }
+ elsif ( $line =~ m/^(\w*)\s+(${unoplist})\s+(.*)$/ )
+ {
+ my $label = $1;
+ my $operator = $2;
+ my $operand = $3; # Fudging, operand includes any comments.
+ print "$label\t$operator $operand\n";
+ }
+ elsif ( $line =~ m/^(\w*)\s+(${b2alist})(.*)$/ )
+ {
+ my $label = $1;
+ my $operator = $2;
+ my $comments = $3;
+ my $realoperator = $operator;
+ print "$label\tPSHS B\t; ** emulating $operator:\n";
+ if ( $operator eq "ABA" )
+ { $realoperator = "ADDA";
+ }
+ elsif ( $operator eq "CBA" )
+ { $realoperator = "CMPA";
+ }
+ elsif ( $operator eq "SBA" )
+ { $realoperator = "SUBA";
+ }
+ print "\t$realoperator ,S+\t; $comments\n";
+ }
+ elsif ( $line =~ m/^(\w*)\s+(${binop8list})\s*(A|B)\s+(.+)$/ )
+ {
+ my $label = $1;
+ my $operator = $2;
+ my $operand = $3;
+ my $comments = $4; # Fudging, comments includes memory operand.
+ print "$label\t${operator}$operand $comments\n";
+ }
+ elsif ( $line =~ m/^(\w*)\s+(${transferlist})(.*)$/ )
+ {
+ my $label = $1;
+ my $operator = $2;
+ my $comments = $3;
+ my $source = substr( $operator, 1, 1 );
+ my $destination = substr( $operator, 2, 1 );
+ if ( $source eq "P" )
+ { $source = "CCR";
+ }
+ if ( $destination eq "P" )
+ { $destination = "CCR";
+ }
+ print "$label\tTFR $source,$destination\t; $operator : $comments\n";
+ }
+ elsif ( $line =~ m/^(\w*)\s+(${flaghandleroplist})($flaghandlerbitlist)(.*)$/ )
+ { # Bits: EFHINZVC, thus I is 0x10, V is 0x02, and C is 0x01.
+ my $label = $1;
+ my $operator = $2;
+ my $bit = $3;
+ my $comments = $4;
+ my $realbits =
+ ( $bit eq "C" )
+ ? "\$01"
+ : ( $bit eq "V" )
+ ? "\$02"
+ : ( $bit eq "I" )
+ ? "\$10"
+ : $bit;
+ my $realoperator = $operator;
+ if ( $operator eq "CL" )
+ { $realoperator = "ANDCC";
+ $realbits = "~" . $realbits;
+ }
+ elsif ( $operator eq "SE" )
+ { $realoperator = "ORCC"
+ }
+ print "$label\t$realoperator #$realbits\t; ${operator}${bit} : $comments\n";
+ }
+ elsif ( $line =~ m/^(\w*)\s+($binop16list)\s+(.+)$/ )
+ {
+ my $label = $1;
+ my $operator = $2;
+ my $operand = $3; # Fudging, operand includes any comments.
+ my $reg16bit = substr( $operator, 2, 1 );
+ print "$label\tCMP$reg16bit\t$operand\n";
+ }
+ elsif ( $line =~ m/^(\w*)\s+(${branchlist})\s+(\*[+-]\$?[0-9A-Fa-f]+)(.*)$/ )
+ {
+ my $label = $1;
+ my $operator = $2;
+ my $operand = $3;
+ my $comments = $4;
+ print "$label\t$operator $operand\t; $comments\n"
+ . "\t****WARNING**** HARD OFFSET: $operand ****\n";
+ }
+ elsif ( $line =~ m/^(\w*)\s+(${interruptstufflist})(.*)$/ )
+ {
+ my $label = $1;
+ my $operator = $2;
+ my $operand = $3; # Fudging, operand includes any comments.
+ print "$label\t$operator$operand\n"
+ . "\t****WARNING**** Interrupt routines must change!! ****\n";
+ }
+ elsif ( $line =~ m/^(\w*)\s+(${waitstufflist})(.*)$/ )
+ {
+ my $label = $1;
+ my $operator = $2;
+ my $operand = $3; # Fudging, operand includes any comments.
+ print "$label\tC$operator #\$EF\t; $operand\n"
+ . "\t****WARNING**** WAI must change to CWAI!! ****\n";
+ }
+ else
+ {
+ print $line;
+ }
+}
+
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