sys/kern/sys_syscall.c

   1 /*      $NetBSD: sys_syscall.c,v 1.8 2008/02/06 22:12:42 dsl 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 1.8 2008/02/06 22:12:42 dsl 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 }