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: releng/5.1/sys/sys/sysent.h 107849 2002-12-14 01:56:26Z alfred $
34 */
35
36 #ifndef _SYS_SYSENT_H_
37 #define _SYS_SYSENT_H_
38
39 struct thread;
40
41 typedef int sy_call_t(struct thread *, 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
48 #define SYF_ARGMASK 0x0000FFFF
49 #define SYF_MPSAFE 0x00010000
50
51 struct image_params;
52 struct __sigset;
53 struct trapframe;
54 struct vnode;
55
56 struct sysentvec {
57 int sv_size; /* number of entries */
58 struct sysent *sv_table; /* pointer to sysent */
59 u_int sv_mask; /* optional mask to index */
60 int sv_sigsize; /* size of signal translation table */
61 int *sv_sigtbl; /* signal translation table */
62 int sv_errsize; /* size of errno translation table */
63 int *sv_errtbl; /* errno translation table */
64 int (*sv_transtrap)(int, int);
65 /* translate trap-to-signal mapping */
66 int (*sv_fixup)(register_t **, struct image_params *);
67 /* stack fixup function */
68 void (*sv_sendsig)(void (*)(int), int, struct __sigset *,
69 u_long); /* send signal */
70 char *sv_sigcode; /* start of sigtramp code */
71 int *sv_szsigcode; /* size of sigtramp code */
72 void (*sv_prepsyscall)(struct trapframe *, int *, u_int *,
73 caddr_t *);
74 char *sv_name; /* name of binary type */
75 int (*sv_coredump)(struct thread *, struct vnode *, off_t);
76 /* function to dump core, or NULL */
77 int (*sv_imgact_try)(struct image_params *);
78 int sv_minsigstksz; /* minimum signal stack size */
79 int sv_pagesize; /* pagesize */
80 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */
81 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */
82 vm_offset_t sv_usrstack; /* USRSTACK */
83 vm_offset_t sv_psstrings; /* PS_STRINGS */
84 int sv_stackprot; /* vm protection for stack */
85 register_t *(*sv_copyout_strings)(struct image_params *);
86 void (*sv_setregs)(struct thread *, u_long, u_long, u_long);
87 };
88
89 #ifdef _KERNEL
90 extern struct sysentvec aout_sysvec;
91 extern struct sysentvec elf_freebsd_sysvec;
92 extern struct sysentvec null_sysvec;
93 extern struct sysent sysent[];
94
95 #define NO_SYSCALL (-1)
96
97 struct module;
98
99 struct syscall_module_data {
100 int (*chainevh)(struct module *, int, void *); /* next handler */
101 void *chainarg; /* arg for next event handler */
102 int *offset; /* offset into sysent */
103 struct sysent *new_sysent; /* new sysent */
104 struct sysent old_sysent; /* old sysent */
105 };
106
107 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
108 static struct syscall_module_data name##_syscall_mod = { \
109 evh, arg, offset, new_sysent, { 0, NULL } \
110 }; \
111 \
112 static moduledata_t name##_mod = { \
113 #name, \
114 syscall_module_handler, \
115 &name##_syscall_mod \
116 }; \
117 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
118
119 #define SYSCALL_MODULE_HELPER(syscallname) \
120 static int syscallname##_syscall = SYS_##syscallname; \
121 static struct sysent syscallname##_sysent = { \
122 (sizeof(struct syscallname ## _args ) \
123 / sizeof(register_t)), \
124 (sy_call_t *)& syscallname \
125 }; \
126 SYSCALL_MODULE(syscallname, \
127 & syscallname##_syscall, & syscallname##_sysent, \
128 NULL, NULL);
129
130 int syscall_register(int *offset, struct sysent *new_sysent,
131 struct sysent *old_sysent);
132 int syscall_deregister(int *offset, struct sysent *old_sysent);
133 int syscall_module_handler(struct module *mod, int what, void *arg);
134
135 #endif /* _KERNEL */
136
137 #endif /* !_SYS_SYSENT_H_ */
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