1/*	$OpenBSD: sigprocmask.S,v 1.13 2023/12/10 16:45:51 deraadt Exp $ */
2/*-
3 * Copyright (c) 1990 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * William Jolitz.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "SYS.h"
35
36SYSENTRY_HIDDEN(sigprocmask)
37	movl	8(%esp),%ecx		# fetch new sigset pointer
38	testl	%ecx,%ecx		# check new sigset pointer
39	jnz	1f			# if not null, indirect
40/*	movl	$0,8(%esp)		# null mask pointer: block empty set */
41	movl	$1,4(%esp)		# SIG_BLOCK
42	jmp	2f
431:	movl	(%ecx),%ecx		# fetch indirect  ...
44	movl	%ecx,8(%esp)		# to new mask arg
452:	movl	$(SYS_sigprocmask),%eax
4699:	int	$0x80
47	PINSYSCALL(SYS_sigprocmask, 99b)
48	jc	1f
49	movl	12(%esp),%ecx		# fetch old mask requested
50	testl	%ecx,%ecx		# test if old mask requested
51	jz	out
52	movl	%eax,(%ecx)		# store old mask
53out:
54	xorl	%eax,%eax
55	ret
561:
57	SET_ERRNO()
58	ret
59SYSCALL_END_HIDDEN(sigprocmask)
60