FreeBSD/Linux Kernel Cross Reference
sys/sys/sysent.h
1 /*-
2 * Copyright (c) 1982, 1988, 1991 The Regents of the University of California.
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 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD$
34 */
35
36 #ifndef _SYS_SYSENT_H_
37 #define _SYS_SYSENT_H_
38
39 struct proc;
40
41 typedef int sy_call_t __P((struct proc *, void *));
42
43 struct sysent { /* system call table */
44 int sy_narg; /* number of arguments */
45 sy_call_t *sy_call; /* implementing function */
46 };
47 #define SCARG(p,k) ((p)->k) /* get arg from args pointer */
48 /* placeholder till we integrate rest of lite2 syscallargs changes XXX */
49
50 struct image_params;
51 struct trapframe;
52
53 struct sysentvec {
54 int sv_size; /* number of entries */
55 struct sysent *sv_table; /* pointer to sysent */
56 u_int sv_mask; /* optional mask to index */
57 int sv_sigsize; /* size of signal translation table */
58 int *sv_sigtbl; /* signal translation table */
59 int sv_errsize; /* size of errno translation table */
60 int *sv_errtbl; /* errno translation table */
61 int (*sv_transtrap) __P((int, int));
62 /* translate trap-to-signal mapping */
63 int (*sv_fixup) __P((long **, struct image_params *));
64 /* stack fixup function */
65 void (*sv_sendsig) __P((void (*)(int), int, int, u_long));
66 /* send signal */
67 char *sv_sigcode; /* start of sigtramp code */
68 int *sv_szsigcode; /* size of sigtramp code */
69 void (*sv_prepsyscall) __P((struct trapframe *, int *,
70 u_int *, caddr_t *));
71 char *sv_name; /* name of binary type */
72 int (*sv_coredump) __P((struct proc *p, struct vnode *, off_t));
73 /* function to dump core, or NULL */
74 };
75
76 #ifdef KERNEL
77 extern struct sysentvec aout_sysvec;
78 extern struct sysent sysent[];
79
80 #define NO_SYSCALL (-1)
81
82 struct module;
83
84 struct syscall_module_data {
85 int (*chainevh)(struct module *, int, void *); /* next handler */
86 void *chainarg; /* arg for next event handler */
87 int *offset; /* offset into sysent */
88 struct sysent *new_sysent; /* new sysent */
89 struct sysent old_sysent; /* old sysent */
90 };
91
92 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
93 static struct syscall_module_data name##_syscall_mod = { \
94 evh, arg, offset, new_sysent \
95 }; \
96 \
97 static moduledata_t name##_mod = { \
98 #name, \
99 syscall_module_handler, \
100 &name##_syscall_mod \
101 }; \
102 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
103
104 int syscall_register __P((int *offset, struct sysent *new_sysent,
105 struct sysent *old_sysent));
106 int syscall_deregister __P((int *offset, struct sysent *old_sysent));
107 int syscall_module_handler __P((struct module *mod, int what, void *arg));
108
109 #endif /* KERNEL */
110
111 #endif /* !_SYS_SYSENT_H_ */
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