set-mote-id

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#!/usr/bin/perl -w
#
# This program changes the mote ID of a TinyOS image. It is used to 
# install a program for a specific mote.
use strict;

my %G_opts = (
  compat => 1,
  objdump => 'avr-objdump',
  objcopy => 'avr-objcopy',
  target => 'srec',
  readdata => 0,
);

# default to backward compatability mode
while( @ARGV && $ARGV[0] =~ /^-/ ) {
  (my $opt = shift @ARGV) =~ s/^-+//;
  if( $opt eq "srec" ) { $G_opts{compat} = 1; }
  elsif( $opt eq "exe" ) { $G_opts{compat} = 0; }
  elsif( $opt eq "read" ) { $G_opts{readdata} = 1; $G_opts{compat} = 0; }
  elsif( exists $G_opts{$opt} ) { $G_opts{$opt} = shift @ARGV; }
  else { die "Unknown command line option $opt\n"; }
}

# print usage if we have the wrong number of arguments
if( @ARGV < ($G_opts{readdata} ? 1 : 3) ) {
  if( $G_opts{compat} ) {
    print "usage: set-mote-id [srec_in] [srec_out] [TOS_LOCAL_ADDRESS] ...\n";
  } else {
    print "usage: set-mote-id [exe_in] [exe_out] [TOS_LOCAL_ADDRESS] ...\n";
  }
  exit 0;
}

# get the args and default variables set up
my $exein = shift @ARGV;
my $exeout = $G_opts{readdata} ? $exein : shift @ARGV;
my %user_symbols = ();
if( $G_opts{readdata} ) {
  for my $name (@ARGV) {
    $name =~ s/\./\$/g;
    $user_symbols{$name} = 1;
  }
} else {
  for my $value (@ARGV) {
    my $name = 'TOS_LOCAL_ADDRESS';
    ($name,$value) = ($1,$2) if $value =~ /^([^=]+)=(.*)/;
    $value = hex $value if $value =~ /^0x/;
    $user_symbols{$name} = $value;
  }
}
my $segment_vma = undef;
my $segment_lma = undef;
my $segment_off = undef;

# if in compatability mode, derive the names of the exes from the srecs
my $srecin = undef;
my $srecout = undef;
if( $G_opts{compat} ) {
  $srecin = $exein;
  $srecout = $exeout;
  $exein =~ s/$G_opts{target}/exe/;
  $exeout =~ s/$G_opts{target}/exe/;
}

# find the data section
open( SECTS, "$G_opts{objdump} -h $exein |" )
  or die "Cannot extract section information: $!\n";
while(<SECTS>) {
  if( /^\s*\d+\s+\.data\s+\S+\s+(\S+)\s+(\S+)\s+(\S+)/ ) {
    $segment_vma = hex $1;
    $segment_lma = hex $2;
    $segment_off = hex $3;
    last;
  }
}
close(SECTS);
die "Could not find data section in $exein, aborting.\n"
  unless defined $segment_vma && defined $segment_lma && defined $segment_off;

# build a hash of all data segment symbols to their address and size
my %exe_symbols = ();
open( SYMBOL, "$G_opts{objdump} -t $exein |" )
  or die "Cannot extract symbol information: $!\n";
while(<SYMBOL>) {
  if( /^(\S+)\s+\S+\s+\S+\s+\.data\s+(\S+)\s+(\S+)\s*$/ ) {
    $exe_symbols{$3} = { addr => hex($1), size => hex($2) };
  }
}
close(SYMBOL);

# slurp the input exe
open (FILE_IN, "<$exein") or die "Could not open $exein: $!\n";
binmode FILE_IN;
my $exe = join("",<FILE_IN>);
close( FILE_IN );

if( $G_opts{readdata} ) {

  my %nums = ( 1 => 'C', 2 => 'v', 4 => 'V' );
  %user_symbols = %exe_symbols unless %user_symbols;

  my $maxlen = 0;
  for (keys %user_symbols) { $maxlen = length if length > $maxlen; }

  for my $symbol (sort keys %user_symbols) {

    if( defined $exe_symbols{$symbol} ) {

      my $addr = $exe_symbols{$symbol}->{addr};
      my $size = $exe_symbols{$symbol}->{size};
      my $filepos = $segment_off + ($addr - $segment_vma);
      my $value = substr( $exe, $filepos, $size );

      (my $valbytes = $value) =~ s/(.)/sprintf('%02x ',ord $1)/eg;
      $valbytes =~ s/\s+$//;
      (my $valstr = $value) =~ s/[^\040-\200]/./g;
      (my $symstr = $symbol) =~ s/\$/./g;
      my $numstr = "";
      if( $nums{length($value)} ) {
	$numstr = sprintf( '  (%d)', unpack($nums{length($value)},$value) );
      }

      print sprintf("%-${maxlen}s  :  %s  %s\n", $symstr, $valbytes, "[$valstr]$numstr" );

    } else {
      warn "Could not find symbol $symbol in $exein, ignoring symbol.\n";
    }
  }

} else {

  # change the desired symbols at their file offsets
  for my $symbol (sort keys %user_symbols) {
    my $value = $user_symbols{$symbol};
    if( defined $exe_symbols{$symbol} ) {
      my $addr = $exe_symbols{$symbol}->{addr};
      my $size = $exe_symbols{$symbol}->{size};
      my $filepos = $segment_off + ($addr - $segment_vma);
      my $bytes = substr( pack("V", $value) . ("\000" x $size), 0, $size );
      substr( $exe, $filepos, $size ) = $bytes;
    } else {
      warn "Could not find symbol $symbol in $exein, ignoring symbol.\n";
    }
  }

  # barf the output exe
  open (FILE_OUT, ">$exeout") or die "Could not open $exeout: $!\n";
  binmode FILE_OUT;
  print FILE_OUT $exe;
  close( FILE_OUT );

  # if in compatability mode, convert the output exe to the output srec
  if( $G_opts{compat} ) {
    my $cmd = "$G_opts{objcopy} --output-target=$G_opts{target} $exeout $srecout";
    system( $cmd ) == 0 or die "Command \"$cmd\" failed";
  }

}