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  * $FreeBSD$
   30  */
   31 
   32 #ifndef _SYS_SYSENT_H_
   33 #define _SYS_SYSENT_H_
   34 
   35 #include <bsm/audit.h>
   36 
   37 struct rlimit;
   38 struct sysent;
   39 struct thread;
   40 struct ksiginfo;
   41 
   42 typedef int     sy_call_t(struct thread *, void *);
   43 
   44 /* Used by the machine dependent syscall() code. */
   45 typedef void (*systrace_probe_func_t)(u_int32_t, int, struct sysent *, void *);
   46 
   47 /*
   48  * Used by loaded syscalls to convert arguments to a DTrace array
   49  * of 64-bit arguments.
   50  */
   51 typedef void (*systrace_args_func_t)(int, void *, u_int64_t *, int *);
   52 
   53 extern systrace_probe_func_t    systrace_probe_func;
   54 
   55 struct sysent {         /* system call table */
   56         int     sy_narg;        /* number of arguments */
   57         sy_call_t *sy_call;     /* implementing function */
   58         au_event_t sy_auevent;  /* audit event associated with syscall */
   59         systrace_args_func_t sy_systrace_args_func;
   60                                 /* optional argument conversion function. */
   61         u_int32_t sy_entry;     /* DTrace entry ID for systrace. */ 
   62         u_int32_t sy_return;    /* DTrace return ID for systrace. */ 
   63 };
   64 
   65 struct image_params;
   66 struct __sigset;
   67 struct trapframe;
   68 struct vnode;
   69 
   70 struct sysentvec {
   71         int             sv_size;        /* number of entries */
   72         struct sysent   *sv_table;      /* pointer to sysent */
   73         u_int           sv_mask;        /* optional mask to index */
   74         int             sv_sigsize;     /* size of signal translation table */
   75         int             *sv_sigtbl;     /* signal translation table */
   76         int             sv_errsize;     /* size of errno translation table */
   77         int             *sv_errtbl;     /* errno translation table */
   78         int             (*sv_transtrap)(int, int);
   79                                         /* translate trap-to-signal mapping */
   80         int             (*sv_fixup)(register_t **, struct image_params *);
   81                                         /* stack fixup function */
   82         void            (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *);
   83                                         /* send signal */
   84         char            *sv_sigcode;    /* start of sigtramp code */
   85         int             *sv_szsigcode;  /* size of sigtramp code */
   86         void            (*sv_prepsyscall)(struct trapframe *, int *, u_int *,
   87                             caddr_t *);
   88         char            *sv_name;       /* name of binary type */
   89         int             (*sv_coredump)(struct thread *, struct vnode *, off_t);
   90                                         /* function to dump core, or NULL */
   91         int             (*sv_imgact_try)(struct image_params *);
   92         int             sv_minsigstksz; /* minimum signal stack size */
   93         int             sv_pagesize;    /* pagesize */
   94         vm_offset_t     sv_minuser;     /* VM_MIN_ADDRESS */
   95         vm_offset_t     sv_maxuser;     /* VM_MAXUSER_ADDRESS */
   96         vm_offset_t     sv_usrstack;    /* USRSTACK */
   97         vm_offset_t     sv_psstrings;   /* PS_STRINGS */
   98         int             sv_stackprot;   /* vm protection for stack */
   99         register_t      *(*sv_copyout_strings)(struct image_params *);
  100         void            (*sv_setregs)(struct thread *, u_long, u_long, u_long);
  101         void            (*sv_fixlimit)(struct rlimit *, int);
  102         u_long          *sv_maxssiz;
  103 };
  104 
  105 #ifdef _KERNEL
  106 extern struct sysentvec aout_sysvec;
  107 extern struct sysentvec elf_freebsd_sysvec;
  108 extern struct sysentvec null_sysvec;
  109 extern struct sysent sysent[];
  110 
  111 #define NO_SYSCALL (-1)
  112 
  113 struct module;
  114 
  115 struct syscall_module_data {
  116        int     (*chainevh)(struct module *, int, void *); /* next handler */
  117        void    *chainarg;      /* arg for next event handler */
  118        int     *offset;         /* offset into sysent */
  119        struct  sysent *new_sysent; /* new sysent */
  120        struct  sysent old_sysent; /* old sysent */
  121 };
  122 
  123 #define MAKE_SYSENT(syscallname)                        \
  124 static struct sysent syscallname##_sysent = {           \
  125     (sizeof(struct syscallname ## _args )               \
  126      / sizeof(register_t)),                             \
  127     (sy_call_t *)& syscallname,                         \
  128     SYS_AUE_##syscallname                               \
  129 }
  130         
  131 #define SYSCALL_MODULE(name, offset, new_sysent, evh, arg)     \
  132 static struct syscall_module_data name##_syscall_mod = {       \
  133        evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL }     \
  134 };                                                             \
  135                                                                \
  136 static moduledata_t name##_mod = {                             \
  137        #name,                                                  \
  138        syscall_module_handler,                                 \
  139        &name##_syscall_mod                                     \
  140 };                                                             \
  141 DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE)
  142 
  143 #define SYSCALL_MODULE_HELPER(syscallname)              \
  144 static int syscallname##_syscall = SYS_##syscallname;   \
  145 MAKE_SYSENT(syscallname);                               \
  146 SYSCALL_MODULE(syscallname,                             \
  147     & syscallname##_syscall, & syscallname##_sysent,    \
  148     NULL, NULL);
  149 
  150 #define SYSCALL_MODULE_PRESENT(syscallname)             \
  151         (sysent[SYS_##syscallname].sy_call !=           \
  152                         (sy_call_t *)lkmnosys &&        \
  153         sysent[SYS_##syscallname].sy_call !=            \
  154                         (sy_call_t *)lkmressys)
  155 
  156 int    syscall_register(int *offset, struct sysent *new_sysent,
  157             struct sysent *old_sysent);
  158 int    syscall_deregister(int *offset, struct sysent *old_sysent);
  159 int    syscall_module_handler(struct module *mod, int what, void *arg);
  160 
  161 /* Special purpose system call functions. */
  162 struct nosys_args;
  163 
  164 int     lkmnosys(struct thread *, struct nosys_args *);
  165 int     lkmressys(struct thread *, struct nosys_args *);
  166 
  167 #endif /* _KERNEL */
  168 
  169 #endif /* !_SYS_SYSENT_H_ */

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