kernel - Introduce lightweight buffers
[dragonfly.git] / sys / sys / exec.h
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1/*-
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * @(#)exec.h 8.3 (Berkeley) 1/21/94
39 * $FreeBSD: src/sys/sys/exec.h,v 1.26 1999/12/29 04:24:40 peter Exp $
26be20a0 40 * $DragonFly: src/sys/sys/exec.h,v 1.5 2006/12/23 00:27:03 swildner Exp $
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41 */
42
43#ifndef _SYS_EXEC_H_
44#define _SYS_EXEC_H_
45
46/*
47 * The following structure is found at the top of the user stack of each
48 * user process. The ps program uses it to locate argv and environment
49 * strings. Programs that wish ps to display other information may modify
50 * it; normally ps_argvstr points to the argv vector, and ps_nargvstr
51 * is the same as the program's argc. The fields ps_envstr and ps_nenvstr
52 * are the equivalent for the environment.
53 */
54struct ps_strings {
55 char **ps_argvstr; /* first of 0 or more argument strings */
56 int ps_nargvstr; /* the number of argument strings */
57 char **ps_envstr; /* first of 0 or more environment strings */
58 int ps_nenvstr; /* the number of environment strings */
59};
60
61/*
62 * Address of ps_strings structure (in user space).
63 */
64#define PS_STRINGS (USRSTACK - sizeof(struct ps_strings))
65#define SPARE_USRSPACE 256
66
67struct image_params;
68
69struct execsw {
b153f746 70 int (*ex_imgact) (struct image_params *);
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71 const char *ex_name;
72};
73
74#include <machine/exec.h>
75
76#ifdef _KERNEL
77#include <sys/cdefs.h>
78
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79struct lwbuf;
80int exec_map_page(struct image_params *, vm_pindex_t, struct lwbuf **,
7c34d798 81 const char **);
5c5185ae 82void exec_unmap_page(struct lwbuf *);
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83int exec_map_first_page (struct image_params *);
84void exec_unmap_first_page (struct image_params *);
984263bc 85
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86int exec_register (const struct execsw *);
87int exec_unregister (const struct execsw *);
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88
89/*
90 * note: name##_mod cannot be const storage because the
91 * linker_file_sysinit() function modifies _file in the
92 * moduledata_t.
93 */
94
95#include <sys/module.h>
96
1843e3f2 97#define DEFINE_EXEC_MODULE(name, execsw_arg) \
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98 static int name ## _modevent(module_t mod, int type, void *data) \
99 { \
100 struct execsw *exec = (struct execsw *)data; \
101 int error = 0; \
102 switch (type) { \
103 case MOD_LOAD: \
26be20a0 104 /* kprintf(#name " module loaded\n"); */ \
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105 error = exec_register(exec); \
106 if (error) \
26be20a0 107 kprintf(#name "register failed\n"); \
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108 break; \
109 case MOD_UNLOAD: \
26be20a0 110 /* kprintf(#name " module unloaded\n"); */ \
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111 error = exec_unregister(exec); \
112 if (error) \
26be20a0 113 kprintf(#name " unregister failed\n"); \
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114 break; \
115 default: \
116 break; \
117 } \
118 return error; \
119 } \
120 static moduledata_t name ## _mod = { \
121 #name, \
122 name ## _modevent, \
123 (void *)& execsw_arg \
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124 };
125
126#define EXEC_SET_ORDERED(name, execsw_arg, order) \
127 DEFINE_EXEC_MODULE(name, execsw_arg) \
128 DECLARE_MODULE(name, name ## _mod, SI_SUB_EXEC, order)
129
130#define EXEC_SET(name, execsw_arg) \
131 EXEC_SET_ORDERED(name, execsw_arg, SI_ORDER_ANY)
132
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133#endif
134
135#endif