2 * Copyright (c) 1982, 1988, 1991 The Regents of the University of California.
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33 * $FreeBSD: src/sys/sys/sysent.h,v 1.27.2.5 2002/03/17 11:08:38 alfred Exp $
34 * $DragonFly: src/sys/sys/sysent.h,v 1.8 2004/07/24 20:21:35 dillon Exp $
37 #ifndef _SYS_SYSENT_H_
38 #define _SYS_SYSENT_H_
42 typedef int sy_call_t (void *);
44 struct sysent { /* system call table */
45 int sy_narg; /* number of arguments */
46 sy_call_t *sy_call; /* start function */
47 sy_call_t *sy_abort; /* abort function (only if start was async) */
50 #define SYF_ARGMASK 0x0000FFFF
51 #define SYF_MPSAFE 0x00010000
53 #define SCARG(p,k) ((p)->k) /* get arg from args pointer */
54 /* placeholder till we integrate rest of lite2 syscallargs changes XXX */
62 int sv_size; /* number of entries */
63 struct sysent *sv_table; /* pointer to sysent */
64 u_int sv_mask; /* optional mask to index, else -1 */
65 int sv_sigsize; /* size of signal translation table */
66 int *sv_sigtbl; /* signal translation table */
67 int sv_errsize; /* size of errno translation table */
68 int *sv_errtbl; /* errno translation table */
69 int (*sv_transtrap) (int, int);
70 /* translate trap-to-signal mapping */
71 int (*sv_fixup) (register_t **, struct image_params *);
72 /* stack fixup function */
73 void (*sv_sendsig) (void (*)(int), int,
74 struct __sigset *, u_long);
76 char *sv_sigcode; /* start of sigtramp code */
77 int *sv_szsigcode; /* size of sigtramp code */
78 void (*sv_prepsyscall) (struct trapframe *, int *,
80 char *sv_name; /* name of binary type */
81 int (*sv_coredump) (struct proc *, struct vnode *,
83 /* function to dump core, or NULL */
84 int (*sv_imgact_try) (struct image_params *);
85 int sv_minsigstksz; /* minimum signal stack size */
89 extern struct sysentvec aout_sysvec;
90 extern struct sysent sysent[];
92 #define NO_SYSCALL (-1)
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 */
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 } \
109 static moduledata_t name##_mod = { \
111 syscall_module_handler, \
112 &name##_syscall_mod \
114 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
116 #define SYSCALL_MODULE_HELPER(syscallname) \
117 static int syscallname##_syscall = SYS_##syscallname; \
118 static struct sysent syscallname##_sysent = { \
119 ((sizeof(struct syscallname ## _args ) - sizeof(struct sysmsg) - \
120 sizeof(union usrmsg)) / sizeof(register_t)), \
121 (sy_call_t *)& syscallname \
123 SYSCALL_MODULE(syscallname, \
124 & syscallname##_syscall, & syscallname##_sysent, \
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);
134 #endif /* !_SYS_SYSENT_H_ */