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. 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: src/sys/sys/sysent.h,v 1.27.2.5 2002/03/17 11:08:38 alfred Exp $
  30  * $DragonFly: src/sys/sys/sysent.h,v 1.12 2007/02/21 15:45:37 corecode Exp $
  31  */
  32
  33 #ifndef _SYS_SYSENT_H_
  34 #define _SYS_SYSENT_H_
  35
  36 #ifndef _SYS_TYPES_H_
  37 #include <sys/types.h>
  38 #endif
  39
  40 struct lwp;
  41
  42 typedef int     sy_call_t (void *);
  43
  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) */
  48 };
  49
  50 #define SYF_ARGMASK     0x0000FFFF
  51
  52 #define SCARG(p,k)      ((p)->k)        /* get arg from args pointer */
  53   /* placeholder till we integrate rest of lite2 syscallargs changes XXX */
  54
  55 struct image_params;
  56 struct __sigset;
  57 struct trapframe;
  58 struct vnode;
  59
  60 struct sysentvec {
  61         int             sv_size;        /* number of entries */
  62         struct sysent   *sv_table;      /* pointer to sysent */
  63         u_int           sv_mask;        /* optional mask to index, else -1 */
  64         int             sv_sigsize;     /* size of signal translation table */
  65         int             *sv_sigtbl;     /* signal translation table */
  66         int             sv_errsize;     /* size of errno translation table */
  67         int             *sv_errtbl;     /* errno translation table */
  68         int             (*sv_transtrap) (int, int);
  69                                         /* translate trap-to-signal mapping */
  70         int             (*sv_fixup) (register_t **, struct image_params *);
  71                                         /* stack fixup function */
  72         void            (*sv_sendsig) (void (*)(int), int,
  73                                            struct __sigset *, u_long);
  74                                         /* send signal */
  75         char            *sv_sigcode;    /* start of sigtramp code */
  76         int             *sv_szsigcode;  /* size of sigtramp code */
  77                                         /* prep syscall (must be MPSAFE) */
  78         void            (*sv_prepsyscall) (struct trapframe *, int *,
  79                                                u_int *, caddr_t *);
  80         char            *sv_name;       /* name of binary type */
  81         int             (*sv_coredump) (struct lwp *, int, struct vnode *,
  82                                             off_t);
  83                                         /* function to dump core, or NULL */
  84         int             (*sv_imgact_try) (struct image_params *);
  85         int             sv_minsigstksz; /* minimum signal stack size */
  86 };
  87
  88 #ifdef _KERNEL
  89 extern struct sysentvec aout_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 ) - sizeof(struct sysmsg)) \
 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_ */