Pastebin: 6800to6809.pl

Format

Perl

Post date

2018-09-17 19:56

Zeitraum der Veröffentlichung

Unbegrenzt

 #!/usr/bin/env perl
 
 # Script to convert M6800 source code to non-optimal M6809 source code.
 # By Joel Matthew Rees, Amagasaki, Japan, September 2018.
 # Copyright 2018 Joel Matthew Rees
 # 
 # Permission to use current version for personal research, entertainment, 
 # and other non-commercial purposes hereby granted, 
 # on condition that authorship and copyright notice are left intact.
 # For other uses, contact the author on social media.
 
   use v5.010.000;
   use warnings;
   use strict;
 
 #  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;
   }
 }