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#!/usr/bin/perl
use strict;
use File::Temp qw'tempdir';
use File::Spec;
use Getopt::Long;
my $dir = tempdir(CLEANUP => 1);
my ($cpu, $ar, $as, $nm, $objcopy, %replace);
GetOptions('cpu=s'=>\$cpu, 'ar=s'=>\$ar, 'as=s'=>\$as,'nm=s'=>\$nm, 'objcopy=s'=>\$objcopy, 'replace=s'=>\%replace);
# Args::
# 1) import lib to create
# 2) input dll
# 3...) extra objects to add
$_ = File::Spec->rel2abs($_) for @ARGV;
my $libdll = shift;
my $inpdll = shift;
open my $nm_fd, '-|', $nm, '-Apg', '--defined-only', $inpdll;
my %text = ();
my %import = ();
my %symfile = ();
my $is64bit = ($cpu eq 'x86_64' ? 1 : 0);
my $sym_prefix = ($is64bit ? '' : '_');
while (<$nm_fd>) {
chomp;
my ($fn, $type, $sym) = /^$inpdll:(.*?):\S+\s+(\S)\s+(\S+)$/o;
next unless $fn;
$text{$fn} = $sym if $type eq 'T';
$import{$fn} = $sym if $type eq 'I';
$symfile{$sym} = $fn;
}
close $nm_fd or exit 1;
for my $sym (keys %replace) {
my $fn;
my $_sym = $sym_prefix . $sym;
if (!defined($fn = $symfile{$_sym})) {
$fn = "$sym.o";
$text{$fn} = $_sym;
}
my $imp_sym = '__imp_' . $sym_prefix . $replace{$sym};
$import{$fn} = $imp_sym;
}
for my $f (keys %text) {
my $imp_sym = delete $import{$f};
my $glob_sym = $text{$f};
if (!defined $imp_sym) {
delete $text{$f};
} elsif ($imp_sym eq '__imp_' . $sym_prefix) {
$text{$f} = 0;
} else {
$text{$f} = 1;
open my $as_fd, '|-', $as, '-o', "$dir/t-$f", "-";
if ($is64bit) {
print $as_fd <<EOF;
.text
.extern $imp_sym
.global $glob_sym
$glob_sym:
jmp *$imp_sym(%rip)
EOF
} else {
print $as_fd <<EOF;
.text
.extern $imp_sym
.global $glob_sym
$glob_sym:
jmp *$imp_sym
EOF
}
close $as_fd or exit 1;
}
}
chdir $dir or die "$0: couldn't cd to $dir - $!\n";
system $ar, 'x', $inpdll;
exit 1 if $?;
for my $f (keys %text) {
if (!$text{$f}) {
unlink $f;
} else {
system $objcopy, '-R', '.text', $f and exit 1;
system $objcopy, '-R', '.bss', '-R', '.data', "t-$f" and exit 1;
}
}
unlink $libdll;
system $ar, 'crus', $libdll, glob('*.o'), @ARGV;
unlink glob('*.o');
exit 1 if $?;
END {
chdir '/tmp'; # Allow $dir directory removal on Windows
}
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