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/kern/kern_xxx.c

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    1 /*      $OpenBSD: kern_xxx.c,v 1.10 2005/11/28 00:14:29 jsg Exp $       */
    2 /*      $NetBSD: kern_xxx.c,v 1.32 1996/04/22 01:38:41 christos Exp $   */
    3 
    4 /*
    5  * Copyright (c) 1982, 1986, 1989, 1993
    6  *      The Regents of the University of California.  All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)kern_xxx.c  8.2 (Berkeley) 11/14/93
   33  */
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/kernel.h>
   38 #include <sys/proc.h>
   39 #include <sys/reboot.h>
   40 #include <uvm/uvm_extern.h>
   41 #include <sys/sysctl.h>
   42 #include <sys/mount.h>
   43 #include <sys/syscallargs.h>
   44 
   45 /* ARGSUSED */
   46 int
   47 sys_reboot(struct proc *p, void *v, register_t *retval)
   48 {
   49         struct sys_reboot_args /* {
   50                 syscallarg(int) opt;
   51         } */ *uap = v;
   52         int error;
   53 
   54         if ((error = suser(p, 0)) != 0)
   55                 return (error);
   56         boot(SCARG(uap, opt));
   57         return (0);
   58 }
   59 
   60 #if !defined(NO_PROPOLICE)
   61 void __stack_smash_handler(char [], int __attribute__((unused)));
   62 
   63 void
   64 __stack_smash_handler(char func[], int damaged)
   65 {
   66         panic("smashed stack in %s", func);
   67 }
   68 #endif
   69 
   70 #ifdef SYSCALL_DEBUG
   71 #define SCDEBUG_CALLS           0x0001  /* show calls */
   72 #define SCDEBUG_RETURNS         0x0002  /* show returns */
   73 #define SCDEBUG_ALL             0x0004  /* even syscalls that are implemented */
   74 #define SCDEBUG_SHOWARGS        0x0008  /* show arguments to calls */
   75 
   76 int     scdebug = SCDEBUG_CALLS|SCDEBUG_RETURNS|SCDEBUG_SHOWARGS;
   77 
   78 void
   79 scdebug_call(struct proc *p, register_t code, register_t args[])
   80 {
   81         struct sysent *sy;
   82         struct emul *em;
   83         int i;
   84 
   85         if (!(scdebug & SCDEBUG_CALLS))
   86                 return;
   87 
   88         em = p->p_emul;
   89         sy = &em->e_sysent[code];
   90         if (!(scdebug & SCDEBUG_ALL || code < 0 || code >= em->e_nsysent ||
   91              sy->sy_call == sys_nosys))
   92                 return;
   93                 
   94         printf("proc %d (%s): %s num ", p->p_pid, p->p_comm, em->e_name);
   95         if (code < 0 || code >= em->e_nsysent)
   96                 printf("OUT OF RANGE (%d)", code);
   97         else {
   98                 printf("%d call: %s", code, em->e_syscallnames[code]);
   99                 if (scdebug & SCDEBUG_SHOWARGS) {
  100                         printf("(");
  101                         for (i = 0; i < sy->sy_argsize / sizeof(register_t);
  102                             i++)
  103                                 printf("%s0x%lx", i == 0 ? "" : ", ",
  104                                     (long)args[i]);
  105                         printf(")");
  106                 }
  107         }
  108         printf("\n");
  109 }
  110 
  111 void
  112 scdebug_ret(struct proc *p, register_t code, int error, register_t retval[])
  113 {
  114         struct sysent *sy;
  115         struct emul *em;
  116 
  117         if (!(scdebug & SCDEBUG_RETURNS))
  118                 return;
  119 
  120         em = p->p_emul;
  121         sy = &em->e_sysent[code];
  122         if (!(scdebug & SCDEBUG_ALL || code < 0 || code >= em->e_nsysent ||
  123             sy->sy_call == sys_nosys))
  124                 return;
  125                 
  126         printf("proc %d (%s): %s num ", p->p_pid, p->p_comm, em->e_name);
  127         if (code < 0 || code >= em->e_nsysent)
  128                 printf("OUT OF RANGE (%d)", code);
  129         else
  130                 printf("%d ret: err = %d, rv = 0x%lx,0x%lx", code,
  131                     error, (long)retval[0], (long)retval[1]);
  132         printf("\n");
  133 }
  134 #endif /* SYSCALL_DEBUG */

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