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: 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 1.12 2007/02/21 15:45:37 corecode Exp $
  35  */
  36
  37 #ifndef _SYS_SYSENT_H_
  38 #define _SYS_SYSENT_H_
  39
  40 #ifndef _SYS_TYPES_H_
  41 #include <sys/types.h>
  42 #endif
  43
  44 struct lwp;
  45
  46 typedef int     sy_call_t (void *);
  47
  48 struct sysent {         /* system call table */
  49         int     sy_narg;        /* number of arguments */
  50         sy_call_t *sy_call;     /* start function */
  51         sy_call_t *sy_abort;    /* abort function (only if start was async) */
  52 };
  53
  54 #define SYF_ARGMASK     0x0000FFFF
  55 #define SYF_MPSAFE      0x00010000
  56
  57 #define SCARG(p,k)      ((p)->k)        /* get arg from args pointer */
  58   /* placeholder till we integrate rest of lite2 syscallargs changes XXX */
  59
  60 struct image_params;
  61 struct __sigset;
  62 struct trapframe;
  63 struct vnode;
  64
  65 struct sysentvec {
  66         int             sv_size;        /* number of entries */
  67         struct sysent   *sv_table;      /* pointer to sysent */
  68         u_int           sv_mask;        /* optional mask to index, else -1 */
  69         int             sv_sigsize;     /* size of signal translation table */
  70         int             *sv_sigtbl;     /* signal translation table */
  71         int             sv_errsize;     /* size of errno translation table */
  72         int             *sv_errtbl;     /* errno translation table */
  73         int             (*sv_transtrap) (int, int);
  74                                         /* translate trap-to-signal mapping */
  75         int             (*sv_fixup) (register_t **, struct image_params *);
  76                                         /* stack fixup function */
  77         void            (*sv_sendsig) (void (*)(int), int,
  78                                            struct __sigset *, u_long);
  79                                         /* send signal */
  80         char            *sv_sigcode;    /* start of sigtramp code */
  81         int             *sv_szsigcode;  /* size of sigtramp code */
  82                                         /* prep syscall (must be MPSAFE) */
  83         void            (*sv_prepsyscall) (struct trapframe *, int *,
  84                                                u_int *, caddr_t *);
  85         char            *sv_name;       /* name of binary type */
  86         int             (*sv_coredump) (struct lwp *, int, struct vnode *,
  87                                             off_t);
  88                                         /* function to dump core, or NULL */
  89         int             (*sv_imgact_try) (struct image_params *);
  90         int             sv_minsigstksz; /* minimum signal stack size */
  91 };
  92
  93 #ifdef _KERNEL
  94 extern struct sysentvec aout_sysvec;
  95 extern struct sysent sysent[];
  96
  97 #define NO_SYSCALL (-1)
  98
  99 struct module;
 100
 101 struct syscall_module_data {
 102        int     (*chainevh)(struct module *, int, void *); /* next handler */
 103        void    *chainarg;      /* arg for next event handler */
 104        int     *offset;         /* offset into sysent */
 105        struct  sysent *new_sysent; /* new sysent */
 106        struct  sysent old_sysent; /* old sysent */
 107 };
 108
 109 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg)     \
 110 static struct syscall_module_data name##_syscall_mod = {       \
 111        evh, arg, offset, new_sysent, { 0, NULL }               \
 112 };                                                             \
 113                                                                \
 114 static moduledata_t name##_mod = {                             \
 115        #name,                                                  \
 116        syscall_module_handler,                                 \
 117        &name##_syscall_mod                                     \
 118 };                                                             \
 119 DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE)
 120
 121 #define SYSCALL_MODULE_HELPER(syscallname)              \
 122 static int syscallname##_syscall = SYS_##syscallname;   \
 123 static struct sysent syscallname##_sysent = {           \
 124     ((sizeof(struct syscallname ## _args ) - sizeof(struct sysmsg)) \
 125         / sizeof(register_t)),    \
 126     (sy_call_t *)& syscallname                          \
 127 };                                                      \
 128 SYSCALL_MODULE(syscallname,                             \
 129     & syscallname##_syscall, & syscallname##_sysent,    \
 130     NULL, NULL);
 131
 132 int    syscall_register (int *offset, struct sysent *new_sysent,
 133                              struct sysent *old_sysent);
 134 int    syscall_deregister (int *offset, struct sysent *old_sysent);
 135 int    syscall_module_handler (struct module *mod, int what, void *arg);
 136
 137 #endif /* _KERNEL */
 138
 139 #endif /* !_SYS_SYSENT_H_ */