linux_util.h revision 85125 
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 85125 2001-10-19 00:46:17Z des $
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 "opt_linux.h"
43
44#include <vm/vm.h>
45#include <vm/vm_param.h>
46#include <vm/pmap.h>
47#include <machine/vmparam.h>
48#include <sys/exec.h>
49#include <sys/sysent.h>
50#include <sys/cdefs.h>
51
52static __inline caddr_t stackgap_init(void);
53static __inline void *stackgap_alloc(caddr_t *, size_t);
54
55#define szsigcode (*(curthread->td_proc->p_sysent->sv_szsigcode))
56
57static __inline caddr_t
58stackgap_init()
59{
60	return (caddr_t)(PS_STRINGS - szsigcode - SPARE_USRSPACE);
61}
62
63static __inline void *
64stackgap_alloc(sgp, sz)
65	caddr_t	*sgp;
66	size_t   sz;
67{
68	void *p = (void *) *sgp;
69
70	sz = ALIGN(sz);
71	if (*sgp + sz > (caddr_t)(PS_STRINGS - szsigcode))
72		return NULL;
73	*sgp += sz;
74	return p;
75}
76
77extern const char linux_emul_path[];
78
79int linux_emul_find __P((struct thread *, caddr_t *, const char *, char *,
80			char **, int));
81
82#define CHECKALT(p, sgp, path, i) 					\
83	do {								\
84		int _error;						\
85									\
86		_error = linux_emul_find(p, sgp, linux_emul_path, path,	\
87		    &path, i);						\
88		if (_error == EFAULT)					\
89			return (_error);				\
90	} while (0)
91
92#define CHECKALTEXIST(p, sgp, path) CHECKALT(p, sgp, path, 0)
93#define CHECKALTCREAT(p, sgp, path) CHECKALT(p, sgp, path, 1)
94
95#define DUMMY(s)							\
96int									\
97linux_ ## s(struct thread *p, struct linux_ ## s ## _args *args)	\
98{									\
99	return (unsupported_msg(p, #s));				\
100}									\
101struct __hack
102
103static __inline int
104unsupported_msg(struct thread *td, const char *fname)
105{
106
107	printf("linux: syscall %s is obsoleted or not implemented (pid=%ld)\n",
108	    fname, (long)td->td_proc->p_pid);
109	return (ENOSYS);
110}
111
112#endif /* !_LINUX_UTIL_H_ */
113