linux_util.h revision 136356 
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 136356 2004-10-10 18:34:30Z dwmalone $
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/syslog.h>
49#include <sys/cdefs.h>
50#include <sys/uio.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#define psstrings (curthread->td_proc->p_sysent->sv_psstrings)
57
58static __inline caddr_t
59stackgap_init()
60{
61	return (caddr_t)(psstrings - szsigcode - SPARE_USRSPACE);
62}
63
64static __inline void *
65stackgap_alloc(sgp, sz)
66	caddr_t	*sgp;
67	size_t   sz;
68{
69	void *p = (void *) *sgp;
70
71	sz = ALIGN(sz);
72	if (*sgp + sz > (caddr_t)(psstrings - szsigcode))
73		return NULL;
74	*sgp += sz;
75	return p;
76}
77
78extern const char linux_emul_path[];
79
80int linux_emul_convpath(struct thread *, char *, enum uio_seg, char **, int);
81int linux_emul_find(struct thread *, caddr_t *, char *, char **, int);
82
83#define CHECKALT(td, sgp, path, i) 					\
84	do {								\
85		int _error;						\
86									\
87		_error = linux_emul_find(td, sgp, path, &path, i);	\
88		if (_error == EFAULT)					\
89			return (_error);				\
90	} while (0)
91
92#define CHECKALTEXIST(td, sgp, path) CHECKALT(td, sgp, path, 0)
93#define CHECKALTCREAT(td, sgp, path) CHECKALT(td, sgp, path, 1)
94
95#define LCONVPATH(td, upath, pathp, i) 					\
96	do {								\
97		int _error;						\
98									\
99		_error = linux_emul_convpath(td, upath, UIO_USERSPACE,  \
100		    pathp, i);						\
101		if (*(pathp) == NULL)					\
102			return (_error);				\
103	} while (0)
104
105#define LCONVPATHEXIST(td, upath, pathp) LCONVPATH(td, upath, pathp, 0)
106#define LCONVPATHCREAT(td, upath, pathp) LCONVPATH(td, upath, pathp, 1)
107#define LFREEPATH(path)	free(path, M_TEMP)
108
109#define DUMMY(s)							\
110int									\
111linux_ ## s(struct thread *td, struct linux_ ## s ## _args *args)	\
112{									\
113	return (unimplemented_syscall(td, #s));				\
114}									\
115struct __hack
116
117void linux_msg(const struct thread *td, const char *fmt, ...)
118	__printflike(2, 3);
119
120static __inline int
121unimplemented_syscall(struct thread *td, const char *syscallname)
122{
123
124	linux_msg(td, "syscall %s not implemented", syscallname);
125	return (ENOSYS);
126}
127
128#endif /* !_LINUX_UTIL_H_ */
129