1/* $NetBSD: sys_syscall.c,v 1.11 2015/03/07 16:38:49 christos 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 1.11 2015/03/07 16:38:49 christos Exp $");
34
35#include <sys/syscall_stats.h>
36#include <sys/syscallvar.h>
37
38/*
39 * MI indirect system call support.
40 * Included from sys_indirect.c and compat/netbsd32/netbsd32_indirect.c
41 *
42 * SYS_SYSCALL is set to the required function name.
43 */
44
45#define CONCAT(a,b) __CONCAT(a,b)
46
47int
48SYS_SYSCALL(struct lwp *l, const struct CONCAT(SYS_SYSCALL, _args) *uap,
49 register_t *rval)
50{
51 /* {
52 syscallarg(int) code;
53 syscallarg(register_t) args[SYS_MAXSYSARGS];
54 } */
55 const struct sysent *callp;
56 struct proc *p = l->l_proc;
57 int code;
58 int error;
59#ifdef NETBSD32_SYSCALL
60 register_t args64[SYS_MAXSYSARGS];
61 int i, narg;
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 sy_call(callp, l, &uap->args, rval);
78
79#ifdef NETBSD32_SYSCALL
80 narg = callp->sy_narg;
81 for (i = 0; i < narg; i++)
82 args64[i] = SCARG(uap, args[i]);
83#endif
84
85 error = trace_enter(code, callp, TRACE_ARGS);
86 if (__predict_false(error != 0))
87 return error;
88 error = sy_call(callp, l, &uap->args, rval);
89 trace_exit(code, callp, &uap->args, rval, error);
90 return error;
91
92 #undef TRACE_ARGS
93}
94