1/*-
2 * Copyright (c) 2014 Andrew Turner
3 * Copyright (c) 2015 The FreeBSD Foundation
4 * All rights reserved.
5 *
6 * This software was developed by Andrew Turner under
7 * sponsorship from the FreeBSD Foundation.
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 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $FreeBSD$
31 */
32
33#include <sys/syscall.h>
34#include <machine/asm.h>
35
36#define	_SYSCALL(name)						\
37	mov	x8, SYS_ ## name;				\
38	svc	0
39
40#define	SYSCALL(name)						\
41ENTRY(__sys_##name);						\
42	WEAK_REFERENCE(__sys_##name, name);			\
43	WEAK_REFERENCE(__sys_##name, _##name);			\
44	_SYSCALL(name);						\
45	ret;							\
46END(__sys_##name)
47
48/*
49 * Conditional jumps can only go up to one megabyte in either
50 * direction, and cerror can be located anywhere, so we have
51 * to jump around to use more capable unconditional branch
52 * instruction.
53 */
54#define	PSEUDO(name)						\
55ENTRY(__sys_##name);						\
56	WEAK_REFERENCE(__sys_##name, _##name);			\
57	_SYSCALL(name);						\
58	b.cs	1f;						\
59	ret;							\
601:	b	cerror;						\
61END(__sys_##name)
62
63#define	RSYSCALL(name)						\
64ENTRY(__sys_##name);						\
65	WEAK_REFERENCE(__sys_##name, name);			\
66	WEAK_REFERENCE(__sys_##name, _##name);			\
67	_SYSCALL(name);						\
68	b.cs	1f;						\
69	ret;							\
701:	b	cerror;						\
71END(__sys_##name)
72