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

     /*      $NetBSD: kern_stub.c,v 1.11 2008/10/15 16:03:29 wrstuden Exp $  */
     
     /*-
      * Copyright (c) 2007, 2008 The NetBSD Foundation, Inc.
      * 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.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    
    /*
     * Copyright (c) 1982, 1986, 1991, 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.
     *
     *      @(#)subr_xxx.c  8.3 (Berkeley) 3/29/95
     */
    
    /*
     * Stubs for system calls and facilities not included in the system.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: kern_stub.c,v 1.11 2008/10/15 16:03:29 wrstuden Exp $");
    
    #include "opt_ptrace.h"
    #include "opt_ktrace.h"
    #include "opt_sa.h"
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/proc.h>
    #include <sys/signalvar.h>
    #include <sys/syscallargs.h>
    #include <sys/ktrace.h>
    #include <sys/intr.h>
    #include <sys/cpu.h>
    
    /*
     * Nonexistent system call-- signal process (may want to handle it).  Flag
     * error in case process won't see signal immediately (blocked or ignored).
     */
    #ifndef PTRACE
    __weak_alias(sys_ptrace,sys_nosys);
    #endif  /* PTRACE */
    
    /*
     * ktrace stubs.  ktruser() goes to enosys as we want to fail the syscall,
     * but not kill the process: utrace() is a debugging feature.
     */
    #ifndef KTRACE
    __weak_alias(ktr_csw,nullop);           /* Probes */
    __weak_alias(ktr_emul,nullop);
    __weak_alias(ktr_geniov,nullop);
    __weak_alias(ktr_genio,nullop);
    __weak_alias(ktr_mibio,nullop);
    __weak_alias(ktr_namei,nullop);
    __weak_alias(ktr_namei2,nullop);
   __weak_alias(ktr_psig,nullop);
   __weak_alias(ktr_saupcall,nullop);
   __weak_alias(ktr_syscall,nullop);
   __weak_alias(ktr_sysret,nullop);
   __weak_alias(ktr_kuser,nullop);
   __weak_alias(ktr_mmsg,nullop);
   __weak_alias(ktr_mib,nullop);
   __weak_alias(ktr_mool,nullop);
   __weak_alias(ktr_execarg,nullop);
   __weak_alias(ktr_execenv,nullop);
   
   __weak_alias(sys_fktrace,sys_nosys);    /* Syscalls */
   __weak_alias(sys_ktrace,sys_nosys);
   __weak_alias(sys_utrace,sys_nosys);
   
   int     ktrace_on;                      /* Misc */
   __weak_alias(ktruser,enosys);
   __weak_alias(ktr_point,nullop);
   #endif  /* KTRACE */
   
   /*
    * Scheduler activations system calls.  These need to remain, even when
    * KERN_SA isn't defined, until libc's major version is bumped.
    */
   #if !defined(KERN_SA)
   __strong_alias(sys_sa_register,sys_nosys);
   __strong_alias(sys_sa_stacks,sys_nosys);
   __strong_alias(sys_sa_enable,sys_nosys);
   __strong_alias(sys_sa_setconcurrency,sys_nosys);
   __strong_alias(sys_sa_yield,sys_nosys);
   __strong_alias(sys_sa_preempt,sys_nosys);
   __strong_alias(sys_sa_unblockyield,sys_nosys);
   #endif
   
   /*
    * Stubs for architectures that do not support kernel preemption.
    */
   #ifndef __HAVE_PREEMPTION
   bool
   cpu_kpreempt_enter(uintptr_t where, int s)
   {
   
           return false;
   }
   
   void
   cpu_kpreempt_exit(uintptr_t where)
   {
   
   }
   
   bool
   cpu_kpreempt_disabled(void)
   {
   
           return true;
   }
   #else
   # ifndef MULTIPROCESSOR
   #   error __HAVE_PREEMPTION requires MULTIPROCESSOR
   # endif
   #endif  /* !__HAVE_PREEMPTION */
   
   /* ARGSUSED */
   int
   sys_nosys(struct lwp *l, const void *v, register_t *retval)
   {
   
           mutex_enter(proc_lock);
           psignal(l->l_proc, SIGSYS);
           mutex_exit(proc_lock);
           return ENOSYS;
   }
   
   /*
    * Unsupported device function (e.g. writing to read-only device).
    */
   int
   enodev(void)
   {
   
           return (ENODEV);
   }
   
   /*
    * Unconfigured device function; driver not configured.
    */
   int
   enxio(void)
   {
   
           return (ENXIO);
   }
   
   /*
    * Unsupported ioctl function.
    */
   int
   enoioctl(void)
   {
   
           return (ENOTTY);
   }
   
   /*
    * Unsupported system function.
    * This is used for an otherwise-reasonable operation
    * that is not supported by the current system binary.
    */
   int
   enosys(void)
   {
   
           return (ENOSYS);
   }
   
   /*
    * Return error for operation not supported
    * on a specific object or file type.
    */
   int
   eopnotsupp(void)
   {
   
           return (EOPNOTSUPP);
   }
   
   /*
    * Generic null operation, always returns success.
    */
   /*ARGSUSED*/
   int
   nullop(void *v)
   {
   
           return (0);
   }

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