SYS.h revision 1.15 
1/*	$NetBSD: SYS.h,v 1.15 2013/08/19 22:13:34 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#define _TEXT_SECTION	.section .text.hot, "ax"
38
39#include <machine/asm.h>
40#include <sys/syscall.h>
41#include <arm/swi.h>
42
43#ifndef __STDC__
44#error __STDC__ not defined
45#endif
46
47#if !defined(__thumb__)
48#define SYSTRAP(x)	svc #SWI_OS_NETBSD | SYS_ ## x
49#else
50.macro	emitsvc	x
51	mov	ip, r0
52.ifeq	\x / 256
53	movs	r0, #\x
54.else
55#if defined(_ARM_ARCH_7)
56	movw	r0, #\x
57#else
58.ifeq (\x & 3)
59	movs	r0, #(\x / 4)
60	lsls	r0, r0, #3
61.else
62.ifeq (\x & 1)
63	movs	r0, #(\x / 2)
64	lsls	r0, r0, #1
65.else
66	movs	r0, #(\x / 256)
67	lsls	r0, r0, #8
68	adds	r0, r0, #(\x & 255)
69.endif
70.endif
71#endif /* !_ARM_ARCH_7 */
72.endif
73	svc	#255
74.endm
75#define SYSTRAP(x)	emitsvc SYS_ ## x
76#endif /* __thumb__ */
77
78#define	CERROR		_C_LABEL(__cerror)
79#define	CURBRK		_C_LABEL(__curbrk)
80
81#define _SYSCALL_NOERROR(x,y)						\
82	ENTRY(x);							\
83	SYSTRAP(y)
84
85#if  !defined(__thumb__) || defined(_ARM_ARCH_T2)
86#define	_INVOKE_CERROR()	bcs CERROR
87#else
88#define	_INVOKE_CERROR()	\
89	bcc 86f; push {r3,lr}; bl CERROR; pop {r3,pc}; 86:
90#endif
91#define _SYSCALL(x, y)							\
92	_SYSCALL_NOERROR(x,y);						\
93	_INVOKE_CERROR()
94
95#define SYSCALL_NOERROR(x)						\
96	_SYSCALL_NOERROR(x,x)
97
98#define SYSCALL(x)							\
99	_SYSCALL(x,x)
100
101
102#define PSEUDO_NOERROR(x,y)						\
103	_SYSCALL_NOERROR(x,y);						\
104	RET;								\
105	END(x)
106
107#define PSEUDO(x,y)							\
108	_SYSCALL(x,y);							\
109	RET;								\
110	END(x)
111
112
113#define RSYSCALL_NOERROR(x)						\
114	PSEUDO_NOERROR(x,x)
115
116#define RSYSCALL(x)							\
117	PSEUDO(x,x)
118
119#ifdef WEAK_ALIAS
120#define	WSYSCALL(weak,strong)						\
121	WEAK_ALIAS(weak,strong);					\
122	PSEUDO(strong,weak)
123#else
124#define	WSYSCALL(weak,strong)						\
125	PSEUDO(weak,weak)
126#endif
127
128	.hidden	CERROR
129	.globl	CERROR
130