newlib-cygwin/winsup/cygwin/gendef

#!/usr/bin/perl
use strict;
my $in = shift;
my $tls_offsets = shift;
my $out = shift;
my $sigfe = shift;

$main::first = 0;
if (!defined($in) || !defined($out) || !defined($sigfe)) {
    die "usage: $0 deffile.in cygtls.h deffile.def sigfe.s\n";
}

require $tls_offsets;

open(IN, $in) or die "$0: couldn't open \"$in\" - $!\n";
my @top = ();
while (<IN>) {
    push(@top, $_);
    last if /^\s*exports\s*$/i;
}
my $libline = <IN>;
my @in = <IN>;
close(IN);

my %sigfe = ();
my @data = ();
my @nosigfuncs = ();
my @out = ();
for (@in) {
    /\sDATA$/o and do {
	push(@data, $_);
	next;
    };
    chomp;
    if (/=/o) {
	if (s/\s+NOSIGFE\s*$//) {
	} elsif (s/ SIGFE$//) {
	  my $func = (split(' '))[2];
	  $sigfe{$func} = '_sigfe_' . $func;
	}
    } else {
	my ($func, $sigfe) = m%^\s*(\S+)(?:\s+((?:NO)?SIGR?FE))?$%o;
	if (defined($sigfe) && $sigfe =~ /^NO/o) {
	    $_ = $func;
	} else {
	    $sigfe ||= 'sigfe';
	    $_ = '_' . lc($sigfe) . '_' . $func;
	    $sigfe{$func} = $_;
	    $_ = $func . ' = ' . $_;
	}
    }
    s/(\S)\s+(\S)/$1 $2/go;
    s/(\S)\s+$/$1/o;
    s/^\s+(\S)/$1/o;
    push(@out, $_ . "\n");
}

for (@out) {
    my ($alias, $func) = /^(\S+) = (\S+)\s*$/o;
    $_ = $alias . ' = ' . $sigfe{$func} . "\n"
      if defined($func) && $sigfe{$func};
}
open(OUT, '>', $out) or die "$0: couldn't open \"$out\" - $!\n";
print OUT @top, @data, @out;
close OUT;

open(SIGFE, '>', $sigfe) or die "$0: couldn't open sigfe file \"$sigfe\" - $!\n";

for my $k (sort keys %sigfe) {
    print SIGFE fefunc($k, $sigfe{$k});
}
close SIGFE;

sub fefunc {
    my $func = '_' . shift;
    my $fe = '_' . shift;
    my $extra;
    my $res = <<EOF;
	.extern	_siglist_index
	.extern	_siglist
	.extern	$func
	.global	$fe
$fe:
	pushl	\$$func
	jmp	__sigfe

EOF
    if (!$main::first++) {
	$res = <<EOF . longjmp () . $res;
	.text
	.global	__sigbe
	.global	_sigreturn
	.global	_sigdelayed

	.stabs	"_sigfe:F(0,1)",36,0,0,__sigbe
__sigfe:
	pushl	%edx
	movl	%fs:4,%eax
	movl	\$4,%edx
	xadd	%edx,$tls::stackptr(%eax)
	leal	__sigbe,%eax
	xchg	%eax,8(%esp)
	movl	%eax,(%edx)
	popl	%edx
	ret

	.stabs	"_sigbe:F(0,1)",36,0,0,__sigbe
__sigbe:
	pushl	%eax
	pushl	%edx
	movl	\$-4,%edx
1:	movl	%fs:4,%eax
	xadd	%edx,$tls::stackptr(%eax)
	xorl	%eax,%eax
	lock    xchg %eax,-4(%edx)
	testl	%eax,%eax
	jnz	2f
	call	_low_priority_sleep
	xorl	%edx,%edx
	jmp	1b
2:	xchg	%eax,4(%esp)
	popl	%edx
	ret

	.stabs	"sigreturn:F(0,1)",36,0,0,_sigreturn
_sigreturn:
	addl	\$4,%esp			# Remove argument
	call	_set_process_mask\@4

	movl	%fs:4,%eax

	cmpl	\$0,$tls::sig(%eax)	# Did a signal come in?
	jnz	3f			# Yes, if non-zero

1:	popl	%edx			# saved errno
	testl	%edx,%edx		# Is it < 0
	jl	2f			# yup.  ignore it
	movl	$tls::errno_addr(%eax),%eax
	movl	%edx,(%eax)
2:	popl	%eax
	popl	%ebx
	popl	%ecx
	popl	%edx
	popl	%edi
	popl	%esi
	popf
	popl	%ebp
	jmp	__sigbe

	.stabs	"sigdelayed:F(0,1)",36,0,0,_sigdelayed
_sigdelayed:
	pushl	%ebp
	movl	%esp,%ebp
	pushf
	pushl	%esi
	pushl	%edi
	pushl	%edx
	pushl	%ecx
	pushl	%ebx
	pushl	%eax
	movl	%fs:4,%ebx
	pushl	$tls::saved_errno(%ebx)	# saved errno
3:	pushl	$tls::oldmask(%ebx)	# oldmask
	pushl	$tls::sig(%ebx)		# signal argument
	pushl	\$_sigreturn

	call	_reset_signal_arrived\@0
	pushl	$tls::func(%ebx)	# signal func
	pushl	$tls::newmask(%ebx)	# newmask - eaten by set_process_mask

	call	_set_process_mask\@4
	movl	\$0,$tls::sig(%ebx)	# zero the signal number as a
					# flag to the signal handler thread
					# that it is ok to set up sigsave
	popl	%ebx
	jmp	*%ebx

EOF
    }
    return $res;
}

sub longjmp {
    return <<EOF;

	.globl	_longjmp

_longjmp:
	pushl	%ebp
	movl	%esp,%ebp
	movl	8(%ebp),%edi
	movl	12(%ebp),%eax
	testl	%eax,%eax
	jne	0f
	incl	%eax
0:
	movl	%eax,0(%edi)
	movl	24(%edi),%ebp
	pushfl
	popl	%ebx
	movw	42(%edi),%ax
	movw	%ax,%ss
	movl	28(%edi),%esp
	pushl	32(%edi)
	pushl	%ebx
	movw	36(%edi),%ax
	movw	%ax,%es
	movw	40(%edi),%ax
	movw	%ax,%gs
	movl	%fs:4,%eax
	leal	($tls::stack)(%eax),%edx
	movl	%edx,($tls::stackptr)(%eax)
	movl	0(%edi),%eax
	movl	4(%edi),%ebx
	movl	8(%edi),%ecx
	movl	12(%edi),%edx
	movl	16(%edi),%esi
	movl	20(%edi),%edi
	popfl
	ret

EOF
}