The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/sysent.h

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    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: src/sys/sys/sysent.h,v 1.44 2004/04/07 04:19:49 imp Exp $
   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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