1 /* $NetBSD: sys_syscall.c,v 1.15 2022/06/29 16:33:09 hannken 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 1.15 2022/06/29 16:33:09 hannken 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
47 static void
CONCAT(SYS_SYSCALL,_biglockcheck)48 CONCAT(SYS_SYSCALL, _biglockcheck)(struct proc *p, int code)
49 {
50
51 #ifdef DIAGNOSTIC
52 kpreempt_disable(); /* make curcpu() stable */
53 KASSERTMSG(curcpu()->ci_biglock_count == 0,
54 "syscall %ld of emul %s leaked %d kernel locks",
55 (long)code, p->p_emul->e_name, curcpu()->ci_biglock_count);
56 kpreempt_enable();
57 #endif
58 }
59
60 int
SYS_SYSCALL(struct lwp * l,const struct CONCAT (SYS_SYSCALL,_args)* uap,register_t * rval)61 SYS_SYSCALL(struct lwp *l, const struct CONCAT(SYS_SYSCALL, _args) *uap,
62 register_t *rval)
63 {
64 /* {
65 syscallarg(int) code;
66 syscallarg(register_t) args[SYS_MAXSYSARGS];
67 } */
68 const struct sysent *callp;
69 struct proc *p = l->l_proc;
70 int code;
71 int error;
72 #ifdef NETBSD32_SYSCALL
73 register_t args64[SYS_MAXSYSARGS];
74 int i, narg;
75 #define TRACE_ARGS args64
76 #else
77 #define TRACE_ARGS &SCARG(uap, args[0])
78 #endif
79
80 callp = p->p_emul->e_sysent;
81
82 code = SCARG(uap, code) & (SYS_NSYSENT - 1);
83 SYSCALL_COUNT(syscall_counts, code);
84 callp += code;
85
86 if (__predict_false(callp->sy_flags & SYCALL_INDIRECT))
87 return ENOSYS;
88
89 if (__predict_true(!p->p_trace_enabled)) {
90 error = sy_call(callp, l, &uap->args, rval);
91 CONCAT(SYS_SYSCALL, _biglockcheck)(p, code);
92 return error;
93 }
94
95 #ifdef NETBSD32_SYSCALL
96 narg = callp->sy_narg;
97 for (i = 0; i < narg; i++)
98 args64[i] = SCARG(uap, args[i]);
99 #endif
100
101 error = trace_enter(code, callp, TRACE_ARGS);
102 if (__predict_true(error == 0))
103 error = sy_call(callp, l, &uap->args, rval);
104 trace_exit(code, callp, &uap->args, rval, error);
105 CONCAT(SYS_SYSCALL, _biglockcheck)(p, code);
106 return error;
107
108 #undef TRACE_ARGS
109 }
110