#!/usr/bin/perl
use integer;
use strict;
sub xit($@);
my $strip = $ARGV[0] eq '-s';
shift if $strip;
my $objdump = shift;
my @objcopy = ((shift));
my $dll = shift;
my $dbg = shift;
xit 0, @objcopy, '--only-keep-debug', $dll, $dbg;
xit 0, @objcopy, '-g', '--add-gnu-debuglink=' . $dbg, $dll;
open(OBJDUMP, '-|', "$objdump --headers $dll");
my %section;
while (<OBJDUMP>) {
    my ($idx, $name, $size, $vma, $lma, $fileoff, $algn) = /^\s*(\d+)\s+(\.\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s+(\S+)\s*$/;
    if ($name eq '.gnu_debuglink') {
	push(@objcopy, '--set-section-flag', '.gnu_debuglink=contents,readonly,debug,noload');
    } elsif ($name eq '.gnu_debuglink_overlay') {
	push (@objcopy, '-R', '.gnu_debuglink_overlay');
	$section{'.gnu_debuglink'}{-idx} = $idx if $section{'.gnu_debuglink'};
	next;
    }
    defined($idx) and
      $section{$name} = {-idx=>int($idx), -size=>hex($size), -vma=>hex($vma), -lma=>hex($lma), -fileoff=>hex($fileoff),
	  -algn=>0x00001000};
}
close OBJDUMP;
my $vma;
for my $k (sort {$section{$a}{-idx} <=> $section{$b}{-idx}} keys %section) {
    if ($strip && $k =~ /\.(?:stab|debug)/o) {
	push(@objcopy, '-R', $k);
	next;
    }
    if (!defined($vma)) {
	$vma = $section{$k}{-vma};
    }
    if ($vma != $section{$k}{-vma}) {
        my $newvma = align($vma, $section{$k}{-algn});
	if ($newvma != $vma) {
	    printf STDERR "$0: ERROR $k VMA 0x%08x != 0x%08x\n", $vma, $newvma;
	    exit 1;
	}
	push(@objcopy, '--change-section-address', sprintf "$k=0x%08x", $vma);
    }
    $vma = align($vma + $section{$k}{-size}, $section{$k}{-algn});
}
warn "$0: ERROR final VMA (" . sprintf("0x%08x", $vma) . ") not on 64K boundary\n" if $vma != align($vma, 64 * 1024);
push(@objcopy, $dll, @ARGV);
xit 1, @objcopy;
sub align {
    my $n = $_[0];
    my $align = $_[1] - 1;
    return ($n + $align) & ~$align;
}

sub xit($@) {
    my $execit = shift;
    print "+ @_\n";
    if ($execit) {
	exec @_ or die "$0: couldn't exec $_[0] - $!\n";
    } else {
	system @_ and die "$0: couldn't exec $_[0] - $!\n";
    }
}