scripts/disas-objdump.pl

   1 #!/usr/bin/perl -w
   2
   3 use File::Temp qw/ tempfile /;
   4 use Getopt::Long;
   5
   6 # Default to the system objdump if a cross-compiler edition not given.
   7 my $aobjdump = "objdump";
   8 my $hobjdump = "";
   9 my $tobjdump = "";
  10 my $hmachine = "";
  11 my $tmachine = "";
  12
  13 GetOptions ('O|objdump=s' => \$aobjdump,
  14             'host-objdump=s' => \$hobjdump,
  15             'target-objdump=s' => \$tobjdump,
  16             'h|host-machine=s' => \$hmachine,
  17             't|target-machine=s' => \$tmachine);
  18
  19 # But we can't default the machines.  Sanity check that we've at least one.
  20 die "No host or target machine type" if !$hmachine && !$tmachine;
  21
  22 # Reuse one temp file for all of the hunks.
  23 my ($outh, $outname) = tempfile();
  24 binmode($outh);
  25 END { unlink $outname; }
  26
  27 # Pre-construct the command-lines for executing the dump.
  28 sub mkobjcommand ($$) {
  29     my ($cmd, $mach) = @_;
  30     return 0 if !$mach;
  31     $cmd = $aobjdump if !$cmd;
  32     return "$cmd -m $mach --disassemble-all -b binary";
  33 }
  34
  35 $objdump[1] = mkobjcommand($hobjdump, $hmachine);
  36 $objdump[2] = mkobjcommand($tobjdump, $tmachine);
  37
  38 # Zero-initialize current dumping state.
  39 my $mem = "";
  40 my $inobjd = 0;
  41 my $vma = 0;
  42
  43 sub objcommand {
  44     my $ret = $objdump[$inobjd];
  45     if (!$ret) {
  46         die "Host machine type not specified" if $inobjd == 1;
  47         die "Target machine type not specified" if $inobjd == 2;
  48         die "Internal error";
  49     }
  50     return $ret;
  51 }
  52
  53 while (<>) {
  54     # Collect the data from the relevant OBJD-* lines ...
  55     if (/^OBJD-H: /) {
  56         die "Internal error" if $inobjd == 2;
  57         $mem = $mem . pack("H*", substr($_, 8, -1));
  58         $inobjd = 1;
  59     } elsif (/^OBJD-T: /) {
  60         die "Internal error" if $inobjd == 1;
  61         $mem = $mem . pack("H*", substr($_, 8, -1));
  62         $inobjd = 2;
  63     }
  64     # ... which will always be followed by a blank line,
  65     # at which point we should produce our dump.
  66     elsif ($inobjd) {
  67         # Rewrite the temp file in one go; it will usually be small.
  68         sysseek $outh, 0, 0;
  69         truncate $outh, 0;
  70         syswrite $outh, $mem;
  71
  72         my $cmd = objcommand();
  73         $cmd = $cmd . " --adjust-vma=" . $vma if $vma;
  74         $cmd = $cmd . " " . $outname;
  75
  76         # Pipe from objdump...
  77         open IN, "-|", $cmd;
  78
  79         # ... copying all but the first 7 lines of boilerplate to our stdout.
  80         my $i = 0;
  81         while (<IN>) {
  82             print if (++$i > 7);
  83         }
  84         close IN;
  85         print "\n";
  86
  87         $mem = "";
  88         $inobjd = 0;
  89         $vma = 0;
  90     }
  91     # The line before "OBJD-*" will be of the form "0x<hex>+: +\n".
  92     # Extract the value for passing to --adjust-vma.
  93     elsif (/^(0x[0-9a-fA-F]+):\s*$/) {
  94         $vma = $1;
  95         print;
  96     } else {
  97         print;
  98     }
  99 }