LXR qemu/scripts/disas-objdump.pl

   1#!/usr/bin/env perl
   2
   3use warnings;
   4
   5use File::Temp qw/ tempfile /;
   6use Getopt::Long;
   7
   8# Default to the system objdump if a cross-compiler edition not given.
   9my $aobjdump = "objdump";
  10my $hobjdump = "";
  11my $tobjdump = "";
  12my $hmachine = "";
  13my $tmachine = "";
  14
  15GetOptions ('O|objdump=s' => \$aobjdump,
  16            'host-objdump=s' => \$hobjdump,
  17            'target-objdump=s' => \$tobjdump,
  18            'h|host-machine=s' => \$hmachine,
  19            't|target-machine=s' => \$tmachine);
  20
  21# But we can't default the machines.  Sanity check that we've at least one.
  22die "No host or target machine type" if !$hmachine && !$tmachine;
  23
  24# Reuse one temp file for all of the hunks.
  25my ($outh, $outname) = tempfile();
  26binmode($outh);
  27END { unlink $outname; }
  28
  29# Pre-construct the command-lines for executing the dump.
  30sub mkobjcommand ($$) {
  31    my ($cmd, $mach) = @_;
  32    return 0 if !$mach;
  33    $cmd = $aobjdump if !$cmd;
  34    return "$cmd -m $mach --disassemble-all -b binary";
  35}
  36
  37$objdump[1] = mkobjcommand($hobjdump, $hmachine);
  38$objdump[2] = mkobjcommand($tobjdump, $tmachine);
  39
  40# Zero-initialize current dumping state.
  41my $mem = "";
  42my $inobjd = 0;
  43my $vma = 0;
  44
  45sub objcommand {
  46    my $ret = $objdump[$inobjd];
  47    if (!$ret) {
  48        die "Host machine type not specified" if $inobjd == 1;
  49        die "Target machine type not specified" if $inobjd == 2;
  50        die "Internal error";
  51    }
  52    return $ret;
  53}
  54
  55while (<>) {
  56    # Collect the data from the relevant OBJD-* lines ...
  57    if (/^OBJD-H: /) {
  58        die "Internal error" if $inobjd == 2;
  59        $mem = $mem . pack("H*", substr($_, 8, -1));
  60        $inobjd = 1;
  61    } elsif (/^OBJD-T: /) {
  62        die "Internal error" if $inobjd == 1;
  63        $mem = $mem . pack("H*", substr($_, 8, -1));
  64        $inobjd = 2;
  65    }
  66    # ... which will always be followed by a blank line,
  67    # at which point we should produce our dump.
  68    elsif ($inobjd) {
  69        # Rewrite the temp file in one go; it will usually be small.
  70        sysseek $outh, 0, 0;
  71        truncate $outh, 0;
  72        syswrite $outh, $mem;
  73
  74        my $cmd = objcommand();
  75        $cmd = $cmd . " --adjust-vma=" . $vma if $vma;
  76        $cmd = $cmd . " " . $outname;
  77
  78        # Pipe from objdump...
  79        open IN, "-|", $cmd;
  80
  81        # ... copying all but the first 7 lines of boilerplate to our stdout.
  82        my $i = 0;
  83        while (<IN>) {
  84            print if (++$i > 7);
  85        }
  86        close IN;
  87        print "\n";
  88
  89        $mem = "";
  90        $inobjd = 0;
  91        $vma = 0;
  92    }
  93    # The line before "OBJD-*" will be of the form "0x<hex>+: +\n".
  94    # Extract the value for passing to --adjust-vma.
  95    elsif (/^(0x[0-9a-fA-F]+):\s*$/) {
  96        $vma = $1;
  97        print;
  98    } else {
  99        print;
 100    }
 101}
 102