SYS.h revision 1.13 
1/*	$NetBSD: SYS.h,v 1.13 2013/08/16 22:20:49 matt Exp $	*/
2
3/*-
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * William Jolitz.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *	from: @(#)SYS.h	5.5 (Berkeley) 5/7/91
35 */
36
37#include <machine/asm.h>
38#include <sys/syscall.h>
39#include <arm/swi.h>
40
41#ifndef __STDC__
42#error __STDC__ not defined
43#endif
44
45#if !defined(__thumb__)
46#define SYSTRAP(x)	svc #SWI_OS_NETBSD | SYS_ ## x
47#else
48.macro	emitsvc	x
49	mov	ip, r0
50.ifeq	\x / 256
51	movs	r0, #\x
52.else
53#if defined(_ARM_ARCH_7)
54	movw	r0, #\x
55#else
56.ifeq (\x & 3)
57	movs	r0, #(\x / 4)
58	lsls	r0, r0, #3
59.else
60.ifeq (\x & 1)
61	movs	r0, #(\x / 2)
62	lsls	r0, r0, #1
63.else
64	movs	r0, #(\x / 256)
65	lsls	r0, r0, #8
66	adds	r0, r0, #(\x & 255)
67.endif
68.endif
69#endif /* !_ARM_ARCH_7 */
70.endif
71	svc	#255
72.endm
73#define SYSTRAP(x)	emitsvc SYS_ ## x
74#endif /* __thumb__ */
75
76#define	CERROR		_C_LABEL(__cerror)
77#define	CURBRK		_C_LABEL(__curbrk)
78
79#define _SYSCALL_NOERROR(x,y)						\
80	ENTRY(x);							\
81	SYSTRAP(y)
82
83#if  !defined(__thumb__) || defined(_ARM_ARCH_T2)
84#define	_INVOKE_CERROR()	bcs CERROR
85#else
86#define	_INVOKE_CERROR()	\
87	bcc 86f; push {r4,lr}; bl CERROR; pop {r4,pc}; 86:
88#endif
89#define _SYSCALL(x, y)							\
90	_SYSCALL_NOERROR(x,y);						\
91	_INVOKE_CERROR()
92
93#define SYSCALL_NOERROR(x)						\
94	_SYSCALL_NOERROR(x,x)
95
96#define SYSCALL(x)							\
97	_SYSCALL(x,x)
98
99
100#define PSEUDO_NOERROR(x,y)						\
101	_SYSCALL_NOERROR(x,y);						\
102	RET;								\
103	END(x)
104
105#define PSEUDO(x,y)							\
106	_SYSCALL(x,y);							\
107	RET;								\
108	END(x)
109
110
111#define RSYSCALL_NOERROR(x)						\
112	PSEUDO_NOERROR(x,x)
113
114#define RSYSCALL(x)							\
115	PSEUDO(x,x)
116
117#ifdef WEAK_ALIAS
118#define	WSYSCALL(weak,strong)						\
119	WEAK_ALIAS(weak,strong);					\
120	PSEUDO(strong,weak)
121#else
122#define	WSYSCALL(weak,strong)						\
123	PSEUDO(weak,weak)
124#endif
125
126	.hidden	CERROR
127	.globl	CERROR
128