xref: /freebsd/sys/compat/freebsd32/freebsd32_util.h (revision 6780ab54325a71e7e70112b11657973edde8655e)
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  * $FreeBSD$
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 
40 struct ia32_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 IA32_USRSTACK	(4L*1024*1024*1024 - PAGE_SIZE)
48 #define IA32_PS_STRINGS	(IA32_USRSTACK - sizeof(struct ia32_ps_strings))
49 
50 static __inline caddr_t stackgap_init(void);
51 static __inline void *stackgap_alloc(caddr_t *, size_t);
52 
53 static __inline caddr_t
54 stackgap_init()
55 {
56 #define	szsigcode (*(curproc->p_sysent->sv_szsigcode))
57 	return (caddr_t)(((caddr_t)IA32_PS_STRINGS) - szsigcode - SPARE_USRSPACE);
58 #undef szsigcode
59 }
60 
61 static __inline void *
62 stackgap_alloc(sgp, sz)
63 	caddr_t *sgp;
64 	size_t   sz;
65 {
66 	void *p;
67 
68 	p = (void *) *sgp;
69 	*sgp += ALIGN(sz);
70 	return p;
71 }
72 
73 
74 extern const char ia32_emul_path[];
75 int ia32_emul_find(struct thread *, caddr_t *, const char *, char *,
76 			char **, int);
77 
78 #define CHECKALT(p, sgp, path, i)					\
79 	do {								\
80 		int _error;						\
81 									\
82 		_error = ia32_emul_find(p, sgp, ia32_emul_path, path,	\
83 					&path, i);			\
84 		if (_error == EFAULT)					\
85 			return (_error);				\
86 	} while (0)
87 
88 #define	CHECKALTEXIST(p, sgp, path) CHECKALT((p), (sgp), (path), 0)
89 #define	CHECKALTCREAT(p, sgp, path) CHECKALT((p), (sgp), (path), 1)
90