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: releng/5.2/sys/compat/freebsd32/freebsd32_util.h 119336 2003-08-23 00:04:53Z 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
40 struct 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 #if defined(__amd64__) || defined(__ia64__)
48 #include <compat/ia32/ia32_util.h>
49 #endif
50
51 #define FREEBSD32_PS_STRINGS \
52 (FREEBSD32_USRSTACK - sizeof(struct freebsd32_ps_strings))
53
54 static __inline caddr_t stackgap_init(void);
55 static __inline void *stackgap_alloc(caddr_t *, size_t);
56
57 static __inline caddr_t
58 stackgap_init()
59 {
60 #define szsigcode (*(curproc->p_sysent->sv_szsigcode))
61 return (caddr_t)(((caddr_t)FREEBSD32_PS_STRINGS) - szsigcode -
62 SPARE_USRSPACE);
63 #undef szsigcode
64 }
65
66 static __inline void *
67 stackgap_alloc(sgp, sz)
68 caddr_t *sgp;
69 size_t sz;
70 {
71 void *p;
72
73 p = (void *) *sgp;
74 *sgp += ALIGN(sz);
75 return p;
76 }
77
78
79 extern const char freebsd32_emul_path[];
80 int freebsd32_emul_find(struct thread *, caddr_t *, const char *, char *,
81 char **, int);
82
83 #define CHECKALT(p, sgp, path, i) \
84 do { \
85 int _error; \
86 \
87 _error = freebsd32_emul_find(p, sgp, \
88 freebsd32_emul_path, path, \
89 &path, i); \
90 if (_error == EFAULT) \
91 return (_error); \
92 } while (0)
93
94 #define CHECKALTEXIST(p, sgp, path) CHECKALT((p), (sgp), (path), 0)
95 #define CHECKALTCREAT(p, sgp, path) CHECKALT((p), (sgp), (path), 1)
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