FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_xxx.c

     /*      $NetBSD: kern_xxx.c,v 1.70 2008/04/25 11:23:42 ad Exp $ */
     
     /*
      * Copyright (c) 1982, 1986, 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)kern_xxx.c  8.3 (Berkeley) 2/14/95
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: kern_xxx.c,v 1.70 2008/04/25 11:23:42 ad Exp $");
    
    #include "opt_syscall_debug.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/proc.h>
    #include <sys/reboot.h>
    #include <sys/syscall.h>
    #include <sys/sysctl.h>
    #include <sys/mount.h>
    #include <sys/syscall.h>
    #include <sys/syscallargs.h>
    #include <sys/kauth.h>
    
    /* ARGSUSED */
    int
    sys_reboot(struct lwp *l, const struct sys_reboot_args *uap, register_t *retval)
    {
            /* {
                    syscallarg(int) opt;
                    syscallarg(char *) bootstr;
            } */
            int error;
            char *bootstr, bs[128];
    
            if ((error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_REBOOT,
                0, NULL, NULL, NULL)) != 0)
                    return (error);
    
            /*
             * Only use the boot string if RB_STRING is set.
             */
            if ((SCARG(uap, opt) & RB_STRING) &&
                (error = copyinstr(SCARG(uap, bootstr), bs, sizeof(bs), 0)) == 0)
                    bootstr = bs;
            else
                    bootstr = NULL;
            /*
             * Not all ports use the bootstr currently.
             */
            KERNEL_LOCK(1, NULL);
            cpu_reboot(SCARG(uap, opt), bootstr);
            KERNEL_UNLOCK_ONE(NULL);
            return (0);
    }
    
    /*
     * Pull in the indirect syscall functions here.
     * They are only actually used if the ports syscall entry code
     * doesn't special-case SYS_SYSCALL and SYS___SYSCALL
     *
     * In some cases the generated code for the two functions is identical,
     * but there isn't a MI way of determining that - so we don't try.
     */
    
    #define SYS_SYSCALL sys_syscall
    #include "sys_syscall.c"
    #undef SYS_SYSCALL
    
    #define SYS_SYSCALL sys___syscall
    #include "sys_syscall.c"
    #undef SYS_SYSCALL
    
   #ifdef SYSCALL_DEBUG
   #define SCDEBUG_CALLS           0x0001  /* show calls */
   #define SCDEBUG_RETURNS         0x0002  /* show returns */
   #define SCDEBUG_ALL             0x0004  /* even syscalls that are implemented */
   #define SCDEBUG_SHOWARGS        0x0008  /* show arguments to calls */
   
   #if 0
   int     scdebug = SCDEBUG_CALLS|SCDEBUG_RETURNS|SCDEBUG_SHOWARGS;
   #else
   int     scdebug = SCDEBUG_CALLS|SCDEBUG_RETURNS|SCDEBUG_SHOWARGS|SCDEBUG_ALL;
   #endif
   
   void
   scdebug_call(register_t code, const register_t args[])
   {
           struct lwp *l = curlwp;
           struct proc *p = l->l_proc;
           const struct sysent *sy;
           const struct emul *em;
           int i;
   
           if (!(scdebug & SCDEBUG_CALLS))
                   return;
   
           em = p->p_emul;
           sy = &em->e_sysent[code];
           if (!(scdebug & SCDEBUG_ALL || (int)code < 0
   #ifndef __HAVE_MINIMAL_EMUL
               || code >= em->e_nsysent
   #endif
               || sy->sy_call == sys_nosys))
                   return;
   
           printf("proc %d (%s): %s num ", p->p_pid, p->p_comm, em->e_name);
           if ((int)code < 0
   #ifndef __HAVE_MINIMAL_EMUL
               || code >= em->e_nsysent
   #endif
               )
                   printf("OUT OF RANGE (%ld)", (long)code);
           else {
                   printf("%ld call: %s", (long)code, em->e_syscallnames[code]);
                   if (scdebug & SCDEBUG_SHOWARGS) {
                           printf("(");
                           for (i = 0; i < sy->sy_argsize/sizeof(register_t); i++)
                                   printf("%s0x%lx", i == 0 ? "" : ", ",
                                       (long)args[i]);
                           printf(")");
                   }
           }
           printf("\n");
   }
   
   void
   scdebug_ret(register_t code, int error, const register_t retval[])
   {
           struct lwp *l = curlwp;
           struct proc *p = l->l_proc;
           const struct sysent *sy;
           const struct emul *em;
   
           if (!(scdebug & SCDEBUG_RETURNS))
                   return;
   
           em = p->p_emul;
           sy = &em->e_sysent[code];
           if (!(scdebug & SCDEBUG_ALL || (int)code < 0
   #ifndef __HAVE_MINIMAL_EMUL
               || (int)code >= em->e_nsysent
   #endif
               || sy->sy_call == sys_nosys))
                   return;
   
           printf("proc %d (%s): %s num ", p->p_pid, p->p_comm, em->e_name);
           if ((int)code < 0
   #ifndef __HAVE_MINIMAL_EMUL
               || code >= em->e_nsysent
   #endif
               )
                   printf("OUT OF RANGE (%ld)", (long)code);
           else
                   printf("%ld ret: err = %d, rv = 0x%lx,0x%lx", (long)code,
                       error, (long)retval[0], (long)retval[1]);
           printf("\n");
   }
   #endif /* SYSCALL_DEBUG */

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