SYS.h revision 1.3 
1/*	$OpenBSD: SYS.h,v 1.3 2018/10/01 22:53:48 mortimer Exp $ */
2
3/*
4 * Copyright (c) 2016 Dale Rahn
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
16 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 */
28
29#include <machine/asm.h>
30#include <sys/syscall.h>
31
32#define SYSTRAP(x) \
33	ldr	x8, =SYS_ ## x;				\
34	svc	0
35
36#define DL_SYSCALL(n)					\
37	.global		__CONCAT(_dl_,n)		;\
38	.type		__CONCAT(_dl_,n)%function	;\
39__CONCAT(_dl_,n):					;\
40	RETGUARD_SETUP(__CONCAT(_dl_,n), x15)		;\
41	SYSTRAP(n)					;\
42	cneg	x0, x0, cs	/* r0 = -errno */	;\
43	RETGUARD_CHECK(__CONCAT(_dl_,n), x15)	 	;\
44	ret
45