lstadjust.pl

   1 #!/usr/bin/perl
   2 #
   3 # Take a NASM list and map file and make the offsets in the list file
   4 # absolute.  This makes debugging a lot easier.
   5 #
   6 # Usage:
   7 #
   8 #  lstadjust.pl listfile mapfile outfile
   9 #
  10
  11 ($listfile, $mapfile, $outfile) = @ARGV;
  12
  13 open(LST, "< $listfile\0")
  14     or die "$0: cannot open: $listfile: $!\n";
  15 open(MAP, "< $mapfile\0")
  16     or die "$0: cannot open: $mapfile: $!\n";
  17 open(OUT, "> $outfile\0")
  18     or die "$0: cannot create: $outfile: $!\n";
  19
  20 %vstart = ();
  21 undef $sec;
  22
  23 while (defined($line = <MAP>)) {
  24     chomp $line;
  25     if ($line =~ /^\-+\s+Section\s+(\S+)\s+\-/) {
  26         $sec = $1;
  27     }
  28     next unless (defined($sec));
  29     if ($line =~ /^vstart:\s+([0-9a-f]+)/i) {
  30         $vstart{$sec} = hex $1;
  31     }
  32 }
  33 close(MAP);
  34
  35 $offset = 0;
  36 @ostack = ();
  37
  38 while (defined($line = <LST>)) {
  39     chomp $line;
  40
  41     $source = substr($line, 40);
  42     if ($source =~ /^([^;]*);/) {
  43         $source = $1;
  44     }
  45
  46     ($label, $op, $arg, $tail) = split(/\s+/, $source);
  47     if ($op =~ /^(|\[)section$/i) {
  48         $offset = $vstart{$arg};
  49     } elsif ($op =~ /^(absolute|\[absolute)$/i) {
  50         $offset = 0;
  51     } elsif ($op =~ /^struc$/i) {
  52         push(@ostack, $offset);
  53         $offset = 0;
  54     } elsif ($op =~ /^endstruc$/i) {
  55         $offset = pop(@ostack);
  56     }
  57
  58     if ($line =~ /^(\s*[0-9]+ )([0-9A-F]{8})(\s.*)$/) {
  59         $line = sprintf("%s%08X%s", $1, (hex $2)+$offset, $3);
  60     }
  61
  62     print OUT $line, "\n";
  63 }