/*      $OpenBSD: sigprocmask.S,v 1.13 2023/12/10 16:45:51 deraadt Exp $ */
/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "SYS.h"

SYSENTRY_HIDDEN(sigprocmask)
        movl    8(%esp),%ecx            # fetch new sigset pointer
        testl   %ecx,%ecx               # check new sigset pointer
        jnz     1f                      # if not null, indirect
/*      movl    $0,8(%esp)              # null mask pointer: block empty set */
        movl    $1,4(%esp)              # SIG_BLOCK
        jmp     2f
1:      movl    (%ecx),%ecx             # fetch indirect  ...
        movl    %ecx,8(%esp)            # to new mask arg
2:      movl    $(SYS_sigprocmask),%eax
99:     int     $0x80
        PINSYSCALL(SYS_sigprocmask, 99b)
        jc      1f
        movl    12(%esp),%ecx           # fetch old mask requested
        testl   %ecx,%ecx               # test if old mask requested
        jz      out
        movl    %eax,(%ecx)             # store old mask
out:
        xorl    %eax,%eax
        ret
1:
        SET_ERRNO()
        ret
SYSCALL_END_HIDDEN(sigprocmask)