freebsd32_util.h revision 119333 
1/*-
2 * Copyright (c) 1998-1999 Andrew Gallatin
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software withough specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD: head/sys/compat/freebsd32/freebsd32_util.h 119333 2003-08-22 23:07:28Z peter $
29 */
30
31#include <vm/vm.h>
32#include <vm/vm_param.h>
33#include <vm/pmap.h>
34
35
36#include <sys/exec.h>
37#include <sys/sysent.h>
38#include <sys/cdefs.h>
39
40struct freebsd32_ps_strings {
41	u_int32_t ps_argvstr;	/* first of 0 or more argument strings */
42	int	ps_nargvstr;	/* the number of argument strings */
43	u_int32_t ps_envstr;	/* first of 0 or more environment strings */
44	int	ps_nenvstr;	/* the number of environment strings */
45};
46
47#define FREEBSD32_PS_STRINGS	\
48	(FREEBSD32_USRSTACK - sizeof(struct freebsd32_ps_strings))
49
50static __inline caddr_t stackgap_init(void);
51static __inline void *stackgap_alloc(caddr_t *, size_t);
52
53static __inline caddr_t
54stackgap_init()
55{
56#define	szsigcode (*(curproc->p_sysent->sv_szsigcode))
57	return (caddr_t)(((caddr_t)FREEBSD32_PS_STRINGS) - szsigcode -
58	    SPARE_USRSPACE);
59#undef szsigcode
60}
61
62static __inline void *
63stackgap_alloc(sgp, sz)
64	caddr_t *sgp;
65	size_t   sz;
66{
67	void *p;
68
69	p = (void *) *sgp;
70	*sgp += ALIGN(sz);
71	return p;
72}
73
74
75extern const char freebsd32_emul_path[];
76int freebsd32_emul_find(struct thread *, caddr_t *, const char *, char *,
77			char **, int);
78
79#define CHECKALT(p, sgp, path, i)					\
80	do {								\
81		int _error;						\
82									\
83		_error = freebsd32_emul_find(p, sgp,			\
84					freebsd32_emul_path, path,	\
85					&path, i);			\
86		if (_error == EFAULT)					\
87			return (_error);				\
88	} while (0)
89
90#define	CHECKALTEXIST(p, sgp, path) CHECKALT((p), (sgp), (path), 0)
91#define	CHECKALTCREAT(p, sgp, path) CHECKALT((p), (sgp), (path), 1)
92