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 * $FreeBSD$
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
52 #ifndef SCARG
53 #define SCARG(p, x) (p)->x
54 #endif
55
56 static __inline caddr_t stackgap_init(void);
57 static __inline void *stackgap_alloc(caddr_t *, size_t);
58
59 #define szsigcode (*(curproc->p_sysent->sv_szsigcode))
60
61 static __inline caddr_t
62 stackgap_init()
63 {
64 return (caddr_t)(PS_STRINGS - szsigcode - SPARE_USRSPACE);
65 }
66
67 static __inline void *
68 stackgap_alloc(sgp, sz)
69 caddr_t *sgp;
70 size_t sz;
71 {
72 void *p = (void *) *sgp;
73
74 sz = ALIGN(sz);
75 if (*sgp + sz > (caddr_t)(PS_STRINGS - szsigcode))
76 return NULL;
77 *sgp += sz;
78 return p;
79 }
80
81 int linux_emul_find __P((struct proc *, caddr_t *, const char *, char *,
82 char **, int));
83
84 #define CHECKALT(p, sgp, path, i) \
85 do { \
86 int _error; \
87 _error = linux_emul_find(p, sgp, linux_emul_path, path, \
88 &path, i); \
89 if (_error == EFAULT) \
90 return (_error); \
91 } while (0)
92
93 #define CHECKALTEXIST(p, sgp, path) CHECKALT(p, sgp, path, 0)
94 #define CHECKALTCREAT(p, sgp, path) CHECKALT(p, sgp, path, 1)
95
96 #endif /* !_LINUX_UTIL_H_ */
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