Start removing the old build infrastructure for the a.out
[dragonfly.git] / lib / libc / i386 / SYS.h
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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: src/lib/libc/i386/SYS.h,v 1.17.2.2 2002/10/15 19:46:46 fjoe Exp $
aa8d5dcb 39 * $DragonFly: src/lib/libc/i386/SYS.h,v 1.3 2004/03/20 16:27:40 drhodus Exp $
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40 */
41
42#include <sys/syscall.h>
43#include "DEFS.h"
44
45#define SYSCALL(x) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); \
46 ENTRY(__CONCAT(_,x)); \
47 .weak CNAME(x); \
48 .set CNAME(x),CNAME(__CONCAT(_,x)); \
49 lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b
50
51#define RSYSCALL(x) SYSCALL(x); ret
52
53#define PSEUDO(x,y) ENTRY(__CONCAT(_,x)); \
54 .weak CNAME(x); \
55 .set CNAME(x),CNAME(__CONCAT(_,x)); \
56 lea __CONCAT(SYS_,y), %eax; KERNCALL; ret
57
58/* gas messes up offset -- although we don't currently need it, do for BCS */
59#define LCALL(x,y) .byte 0x9a ; .long y; .word x
60
61/*
62 * Design note:
63 *
64 * The macros PSYSCALL() and PRSYSCALL() are intended for use where a
65 * syscall needs to be renamed in the threaded library. When building
66 * a normal library, they default to the traditional SYSCALL() and
67 * RSYSCALL(). This avoids the need to #ifdef _THREAD_SAFE everywhere
68 * that the renamed function needs to be called.
69 */
70#ifdef _THREAD_SAFE
71/*
72 * For the thread_safe versions, we prepend __sys_ to the function
73 * name so that the 'C' wrapper can go around the real name.
74 */
75#define PSYSCALL(x) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); \
76 ENTRY(__CONCAT(__sys_,x)); \
77 lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b
78#define PRSYSCALL(x) PSYSCALL(x); ret
79#define PPSEUDO(x,y) ENTRY(__CONCAT(__sys_,x)); \
80 lea __CONCAT(SYS_,y), %eax; KERNCALL; ret
81#else
82/*
83 * The non-threaded library defaults to traditional syscalls where
84 * the function name matches the syscall name.
85 */
86#define PSYSCALL(x) SYSCALL(x)
87#define PRSYSCALL(x) RSYSCALL(x)
88#define PPSEUDO(x,y) PSEUDO(x,y)
89#endif
90
aa8d5dcb 91#define KERNCALL int $0x80