1/*	$OpenBSD: SYS.h,v 1.3 2023/12/11 22:29:24 deraadt Exp $ */
2
3/*
4 * Copyright (c) 2002 Dale Rahn
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
17 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
20 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29
30#include <sys/syscall.h>
31#include <machine/asm.h>
32
33#define PINSYSCALL(sysno, label)				\
34	.pushsection .openbsd.syscalls,"",@progbits		;\
35	.p2align 2						;\
36	.long label						;\
37	.long sysno						;\
38	.popsection
39
40#define DL_SYSCALL(n)						\
41	.section	".text"					;\
42	.align		16,0xcc					;\
43	.global		__CONCAT(_dl_,n)			;\
44	.type		__CONCAT(_dl_,n),@function		;\
45__CONCAT(_dl_,n):						;\
46	movl $__CONCAT(SYS_, n),%eax;				;\
4799:	int $0x80						;\
48	PINSYSCALL(__CONCAT(SYS_, n), 99b)			;\
49	jb	.L_cerr						;\
50	ret
51
52.L_cerr:
53	/* error: result = -errno; - handled here. */
54	neg	%eax
55	ret
56