sys_syscall.c

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    1 /*      $NetBSD: sys_syscall.c,v 1.9 2008/04/29 06:53:03 martin Exp $   */
    2 
    3 /*-
    4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by David Laight.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   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  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __KERNEL_RCSID(0, "$NetBSD: sys_syscall.c,v 1.9 2008/04/29 06:53:03 martin Exp $");
   34 
   35 #include <sys/syscall_stats.h>
   36 
   37 /*
   38  * MI indirect system call support.
   39  * Included from sys_indirect.c and compat/netbsd32/netbsd32_indirect.c
   40  *
   41  * SYS_SYSCALL is set to the required function name.
   42  */
   43 
   44 #define CONCAT(a,b) __CONCAT(a,b)
   45 
   46 int
   47 SYS_SYSCALL(struct lwp *l, const struct CONCAT(SYS_SYSCALL, _args) *uap,
   48     register_t *rval)
   49 {
   50         /* {
   51                 syscallarg(int) code;
   52                 syscallarg(register_t) args[SYS_MAXSYSARGS];
   53         } */
   54         const struct sysent *callp;
   55         struct proc *p = l->l_proc;
   56         int code;
   57         int error;
   58         int narg;
   59 #ifdef NETBSD32_SYSCALL
   60         register_t args64[SYS_MAXSYSARGS];
   61         int i;
   62         #define TRACE_ARGS args64
   63 #else
   64         #define TRACE_ARGS &SCARG(uap, args[0])
   65 #endif
   66 
   67         callp = p->p_emul->e_sysent;
   68 
   69         code = SCARG(uap, code) & (SYS_NSYSENT - 1);
   70         SYSCALL_COUNT(syscall_counts, code);
   71         callp += code;
   72 
   73         if (__predict_false(callp->sy_flags & SYCALL_INDIRECT))
   74                 return ENOSYS;
   75 
   76         if (__predict_true(!p->p_trace_enabled))
   77                 return callp->sy_call(l, &uap->args, rval);
   78 
   79         narg = callp->sy_narg;
   80 #ifdef NETBSD32_SYSCALL
   81         for (i = 0; i < narg; i++)
   82                 args64[i] = SCARG(uap, args[i]);
   83 #endif
   84 
   85         error = trace_enter(code, TRACE_ARGS, narg);
   86         if (__predict_false(error != 0))
   87                 return error;
   88         error = callp->sy_call(l, &uap->args, rval);
   89         trace_exit(code, rval, error);
   90         return error;
   91 
   92         #undef TRACE_ARGS
   93 }

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

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sys/kern/sys_syscall.c