proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / emulation / linux / linux_util.h
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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: src/sys/compat/linux/linux_util.h,v 1.12.2.2 2000/11/02 23:31:28 obrien Exp $
dadab5e9 32 * $DragonFly: src/sys/emulation/linux/linux_util.h,v 1.4 2003/06/25 03:55:44 dillon Exp $
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33 */
34
35/*
36 * This file is pretty much the same as Christos' svr4_util.h
37 * (for now).
38 */
39
40#ifndef _LINUX_UTIL_H_
41#define _LINUX_UTIL_H_
42
43#include "opt_linux.h"
44
45#include <vm/vm.h>
46#include <vm/vm_param.h>
47#include <vm/pmap.h>
48#include <machine/vmparam.h>
49#include <sys/exec.h>
50#include <sys/sysent.h>
51#include <sys/cdefs.h>
52
53static __inline caddr_t stackgap_init(void);
54static __inline void *stackgap_alloc(caddr_t *, size_t);
55
dadab5e9 56#define szsigcode(p) (*((p)->p_sysent->sv_szsigcode))
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57
58static __inline caddr_t
59stackgap_init()
60{
dadab5e9 61 return (caddr_t)(PS_STRINGS - szsigcode(curproc) - SPARE_USRSPACE);
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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);
dadab5e9 72 if (*sgp + sz > (caddr_t)(PS_STRINGS - szsigcode(curproc)))
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73 return NULL;
74 *sgp += sz;
75 return p;
76}
77
78extern const char linux_emul_path[];
79
dadab5e9 80int linux_emul_find __P((struct thread *, caddr_t *, const char *, char *, char **, int));
984263bc 81
41c20dac 82#define CHECKALT(sgp, path, i) \
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83 do { \
84 int _error; \
85 \
dadab5e9 86 _error = linux_emul_find(curthread, sgp, linux_emul_path, path, \
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87 &path, i); \
88 if (_error == EFAULT) \
89 return (_error); \
90 } while (0)
91
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92#define CHECKALTEXIST(sgp, path) CHECKALT(sgp, path, 0)
93#define CHECKALTCREAT(sgp, path) CHECKALT(sgp, path, 1)
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94
95#define DUMMY(s) \
96int \
41c20dac 97linux_ ## s(struct linux_ ## s ## _args *args) \
984263bc 98{ \
41c20dac 99 return (unsupported_msg(#s)); \
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100} \
101struct __hack
102
103static __inline int
41c20dac 104unsupported_msg(const char *fname)
984263bc 105{
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106 struct thread *td = curthread;
107 if (td->td_proc) {
108 printf(
109 "linux: syscall %s is obsoleted or not implemented (pid=%d)\n",
110 fname, (int)td->td_proc->p_pid
111 );
112 } else {
113 printf(
114 "linux: syscall %s is obsoleted or not implemented (td=%p)\n",
115 fname, td
116 );
117 }
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118 return (ENOSYS);
119}
120
121#endif /* !_LINUX_UTIL_H_ */