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/i386/ibcs2/ibcs2_isc.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1994 Søren Schmidt
    5  * Copyright (c) 1994 Sean Eric Fagan
    6  * Copyright (c) 1995 Steven Wallace
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer
   14  *    in this position and unchanged.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. The name of the author may not be used to endorse or promote products
   19  *    derived from this software without specific prior written permission
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: stable/12/sys/i386/ibcs2/ibcs2_isc.c 326260 2017-11-27 15:08:52Z pfg $");
   35 
   36 #include <sys/param.h>
   37 #include <sys/lock.h>
   38 #include <sys/mutex.h>
   39 #include <sys/systm.h>
   40 #include <sys/sysent.h>
   41 #include <sys/proc.h>
   42 
   43 #include <machine/cpu.h>
   44 
   45 #include <i386/ibcs2/ibcs2_types.h>
   46 #include <i386/ibcs2/ibcs2_signal.h>
   47 #include <i386/ibcs2/ibcs2_proto.h>
   48 #include <i386/ibcs2/ibcs2_isc_syscall.h>
   49 
   50 extern struct sysent isc_sysent[];
   51 
   52 int
   53 ibcs2_isc(struct thread *td, struct ibcs2_isc_args *uap)
   54 {
   55         struct trapframe *tf = td->td_frame;
   56         struct sysent *callp;
   57         u_int code;
   58         int error;
   59 
   60         code = (tf->tf_eax & 0xffffff00) >> 8;
   61         callp = &isc_sysent[code];
   62 
   63         if (code < IBCS2_ISC_MAXSYSCALL)
   64                 error = (*callp->sy_call)(td, (void *)uap);
   65         else
   66                 error = ENOSYS;
   67         return (error);
   68 }

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