SYS.h revision 71770 
1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	from: @(#)SYS.h	5.5 (Berkeley) 5/7/91
37 *
38 * $FreeBSD: head/lib/libc/amd64/SYS.h 71770 2001-01-29 03:23:46Z deischen $
39 */
40
41#include <sys/syscall.h>
42#include "DEFS.h"
43
44#define	SYSCALL(x)	2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror));	\
45			ENTRY(__CONCAT(__sys_,x));			\
46			.weak CNAME(x);					\
47			.set CNAME(x),CNAME(__CONCAT(__sys_,x));	\
48			.weak CNAME(__CONCAT(_,x));			\
49			.set CNAME(__CONCAT(_,x)),CNAME(__CONCAT(__sys_,x)); \
50			lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b
51
52#define	RSYSCALL(x)	SYSCALL(x); ret
53
54#define	PSEUDO(x)	ENTRY(__CONCAT(__sys_,x));			\
55			.weak CNAME(__CONCAT(_,x));			\
56			.set CNAME(__CONCAT(_,x)),CNAME(__CONCAT(__sys_,x)); \
57			lea __CONCAT(SYS_,x), %eax; KERNCALL; ret
58
59/* gas messes up offset -- although we don't currently need it, do for BCS */
60#define	LCALL(x,y)	.byte 0x9a ; .long y; .word x
61
62#ifdef __ELF__
63#define KERNCALL	int $0x80	/* Faster */
64#else
65#define KERNCALL	LCALL(7,0)	/* The old way */
66#endif
67