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 static __inline caddr_t stackgap_init(void);
53 static __inline void *stackgap_alloc(caddr_t *, size_t);
54
55 #define szsigcode (*(curproc->p_sysent->sv_szsigcode))
56
57 static __inline caddr_t
58 stackgap_init()
59 {
60 return (caddr_t)(PS_STRINGS - szsigcode - SPARE_USRSPACE);
61 }
62
63 static __inline void *
64 stackgap_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
77 extern const char linux_emul_path[];
78
79 int linux_emul_find __P((struct proc *, 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) \
96 int \
97 linux_ ## s(struct proc *p, struct linux_ ## s ## _args *args) \
98 { \
99 return (unsupported_msg(p, #s)); \
100 } \
101 struct __hack
102
103 static __inline int
104 unsupported_msg(struct proc *p, const char *fname)
105 {
106
107 printf("linux: syscall %s is obsoleted or not implemented (pid=%ld)\n",
108 fname, (long)p->p_pid);
109 return (ENOSYS);
110 }
111
112 #endif /* !_LINUX_UTIL_H_ */
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