1 /* $NetBSD: syscallvar.h,v 1.11 2015/09/24 14:34:22 christos Exp $ */
2
3 /*-
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software developed for The NetBSD Foundation
8 * by Andrew Doran.
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 #ifndef _SYS_SYSCALLVAR_H_
33 #define _SYS_SYSCALLVAR_H_
34
35 #ifndef _KERNEL
36 #error nothing of interest to userspace here
37 #endif
38
39 #if defined(_KERNEL) && defined(_KERNEL_OPT)
40 #include "opt_dtrace.h"
41 #endif
42
43 #include <sys/systm.h>
44 #include <sys/proc.h>
45
46 extern struct emul emul_netbsd;
47
48 struct syscall_package {
49 u_short sp_code;
50 u_short sp_flags;
51 sy_call_t *sp_call;
52 };
53
54 void syscall_init(void);
55 int syscall_establish(const struct emul *, const struct syscall_package *);
56 int syscall_disestablish(const struct emul *, const struct syscall_package *);
57
58 static inline int
sy_call(const struct sysent * sy,struct lwp * l,const void * uap,register_t * rval)59 sy_call(const struct sysent *sy, struct lwp *l, const void *uap,
60 register_t *rval)
61 {
62 int error;
63
64 l->l_sysent = sy;
65 error = (*sy->sy_call)(l, uap, rval);
66 l->l_sysent = NULL;
67
68 return error;
69 }
70
71 static inline int
sy_invoke(const struct sysent * sy,struct lwp * l,const void * uap,register_t * rval,int code)72 sy_invoke(const struct sysent *sy, struct lwp *l, const void *uap,
73 register_t *rval, int code)
74 {
75 const bool do_trace = l->l_proc->p_trace_enabled &&
76 (sy->sy_flags & SYCALL_INDIRECT) == 0;
77 int error;
78
79 #ifdef KDTRACE_HOOKS
80 #define KDTRACE_ENTRY(a) (a)
81 #else
82 #define KDTRACE_ENTRY(a) (0)
83 #endif
84 if (__predict_true(!(do_trace || KDTRACE_ENTRY(sy->sy_entry)))
85 || (error = trace_enter(code, sy, uap)) == 0) {
86 rval[0] = 0;
87 #if !defined(__mips__) && !defined(__m68k__)
88 /*
89 * Due to the mips userland code for SYS_break needing v1 to be
90 * preserved, we can't clear this on mips.
91 */
92 rval[1] = 0;
93 #endif
94 error = sy_call(sy, l, uap, rval);
95 }
96
97 if (__predict_false(do_trace || KDTRACE_ENTRY(sy->sy_return))) {
98 trace_exit(code, sy, uap, rval, error);
99 }
100 return error;
101 }
102
103 /* inclusion in the kernel currently depends on SYSCALL_DEBUG */
104 extern const char * const syscallnames[];
105 extern const char * const altsyscallnames[];
106
107 #endif /* _SYS_SYSCALLVAR_H_ */
108