linux_util.h revision 90690 
1/*
2 * Copyright (c) 1994 Christos Zoulas
3 * Copyright (c) 1995 Frank van der Linden
4 * Copyright (c) 1995 Scott Bartram
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * from: svr4_util.h,v 1.5 1994/11/18 02:54:31 christos Exp
30 * from: linux_util.h,v 1.2 1995/03/05 23:23:50 fvdl Exp
31 * $FreeBSD: head/sys/compat/linux/linux_util.h 90690 2002-02-15 10:19:39Z bde $
32 */
33
34/*
35 * This file is pretty much the same as Christos' svr4_util.h
36 * (for now).
37 */
38
39#ifndef	_LINUX_UTIL_H_
40#define	_LINUX_UTIL_H_
41
42#include <vm/vm.h>
43#include <vm/vm_param.h>
44#include <vm/pmap.h>
45#include <machine/vmparam.h>
46#include <sys/exec.h>
47#include <sys/sysent.h>
48#include <sys/cdefs.h>
49
50static __inline caddr_t stackgap_init(void);
51static __inline void *stackgap_alloc(caddr_t *, size_t);
52
53#define szsigcode (*(curthread->td_proc->p_sysent->sv_szsigcode))
54
55static __inline caddr_t
56stackgap_init()
57{
58	return (caddr_t)(PS_STRINGS - szsigcode - SPARE_USRSPACE);
59}
60
61static __inline void *
62stackgap_alloc(sgp, sz)
63	caddr_t	*sgp;
64	size_t   sz;
65{
66	void *p = (void *) *sgp;
67
68	sz = ALIGN(sz);
69	if (*sgp + sz > (caddr_t)(PS_STRINGS - szsigcode))
70		return NULL;
71	*sgp += sz;
72	return p;
73}
74
75extern const char linux_emul_path[];
76
77int linux_emul_find __P((struct thread *, caddr_t *, char *, char **, int));
78
79#define CHECKALT(p, sgp, path, i) 					\
80	do {								\
81		int _error;						\
82									\
83		_error = linux_emul_find(p, sgp, path, &path, i);	\
84		if (_error == EFAULT)					\
85			return (_error);				\
86	} while (0)
87
88#define CHECKALTEXIST(p, sgp, path) CHECKALT(p, sgp, path, 0)
89#define CHECKALTCREAT(p, sgp, path) CHECKALT(p, sgp, path, 1)
90
91#define DUMMY(s)							\
92int									\
93linux_ ## s(struct thread *p, struct linux_ ## s ## _args *args)	\
94{									\
95	return (unsupported_msg(p, #s));				\
96}									\
97struct __hack
98
99static __inline int
100unsupported_msg(struct thread *td, const char *fname)
101{
102
103	printf("linux: syscall %s is obsoleted or not implemented (pid=%ld)\n",
104	    fname, (long)td->td_proc->p_pid);
105	return (ENOSYS);
106}
107
108#endif /* !_LINUX_UTIL_H_ */
109