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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: releng/5.4/sys/sys/sysent.h 145335 2005-04-20 19:11:07Z cvs2svn $
30 */
31
32 #ifndef _SYS_SYSENT_H_
33 #define _SYS_SYSENT_H_
34
35 struct thread;
36
37 typedef int sy_call_t(struct thread *, void *);
38
39 struct sysent { /* system call table */
40 int sy_narg; /* number of arguments */
41 sy_call_t *sy_call; /* implementing function */
42 };
43
44 #define SYF_ARGMASK 0x0000FFFF
45 #define SYF_MPSAFE 0x00010000
46
47 struct image_params;
48 struct __sigset;
49 struct trapframe;
50 struct vnode;
51
52 struct sysentvec {
53 int sv_size; /* number of entries */
54 struct sysent *sv_table; /* pointer to sysent */
55 u_int sv_mask; /* optional mask to index */
56 int sv_sigsize; /* size of signal translation table */
57 int *sv_sigtbl; /* signal translation table */
58 int sv_errsize; /* size of errno translation table */
59 int *sv_errtbl; /* errno translation table */
60 int (*sv_transtrap)(int, int);
61 /* translate trap-to-signal mapping */
62 int (*sv_fixup)(register_t **, struct image_params *);
63 /* stack fixup function */
64 void (*sv_sendsig)(void (*)(int), int, struct __sigset *,
65 u_long); /* send signal */
66 char *sv_sigcode; /* start of sigtramp code */
67 int *sv_szsigcode; /* size of sigtramp code */
68 void (*sv_prepsyscall)(struct trapframe *, int *, u_int *,
69 caddr_t *);
70 char *sv_name; /* name of binary type */
71 int (*sv_coredump)(struct thread *, struct vnode *, off_t);
72 /* function to dump core, or NULL */
73 int (*sv_imgact_try)(struct image_params *);
74 int sv_minsigstksz; /* minimum signal stack size */
75 int sv_pagesize; /* pagesize */
76 vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */
77 vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */
78 vm_offset_t sv_usrstack; /* USRSTACK */
79 vm_offset_t sv_psstrings; /* PS_STRINGS */
80 int sv_stackprot; /* vm protection for stack */
81 register_t *(*sv_copyout_strings)(struct image_params *);
82 void (*sv_setregs)(struct thread *, u_long, u_long, u_long);
83 void (*sv_fixlimits)(struct image_params *);
84 };
85
86 #ifdef _KERNEL
87 extern struct sysentvec aout_sysvec;
88 extern struct sysentvec elf_freebsd_sysvec;
89 extern struct sysentvec null_sysvec;
90 extern struct sysent sysent[];
91
92 #define NO_SYSCALL (-1)
93
94 struct module;
95
96 struct syscall_module_data {
97 int (*chainevh)(struct module *, int, void *); /* next handler */
98 void *chainarg; /* arg for next event handler */
99 int *offset; /* offset into sysent */
100 struct sysent *new_sysent; /* new sysent */
101 struct sysent old_sysent; /* old sysent */
102 };
103
104 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \
105 static struct syscall_module_data name##_syscall_mod = { \
106 evh, arg, offset, new_sysent, { 0, NULL } \
107 }; \
108 \
109 static moduledata_t name##_mod = { \
110 #name, \
111 syscall_module_handler, \
112 &name##_syscall_mod \
113 }; \
114 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
115
116 #define SYSCALL_MODULE_HELPER(syscallname) \
117 static int syscallname##_syscall = SYS_##syscallname; \
118 static struct sysent syscallname##_sysent = { \
119 (sizeof(struct syscallname ## _args ) \
120 / sizeof(register_t)), \
121 (sy_call_t *)& syscallname \
122 }; \
123 SYSCALL_MODULE(syscallname, \
124 & syscallname##_syscall, & syscallname##_sysent, \
125 NULL, NULL);
126
127 int syscall_register(int *offset, struct sysent *new_sysent,
128 struct sysent *old_sysent);
129 int syscall_deregister(int *offset, struct sysent *old_sysent);
130 int syscall_module_handler(struct module *mod, int what, void *arg);
131
132 #endif /* _KERNEL */
133
134 #endif /* !_SYS_SYSENT_H_ */
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