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sys_syscall.c revision 1.8.10.1 
      1 /*	$NetBSD: sys_syscall.c,v 1.8.10.1 2008/05/16 02:25:27 yamt 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 1.8.10.1 2008/05/16 02:25:27 yamt 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 }
     94