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 * 3. Neither the name of The NetBSD Foundation nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 * POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: sys_syscall.c,v 1.8 2008/02/06 22:12:42 dsl Exp $"); 37 38 #include <sys/syscall_stats.h> 39 40 /* 41 * MI indirect system call support. 42 * Included from sys_indirect.c and compat/netbsd32/netbsd32_indirect.c 43 * 44 * SYS_SYSCALL is set to the required function name. 45 */ 46 47 #define CONCAT(a,b) __CONCAT(a,b) 48 49 int 50 SYS_SYSCALL(struct lwp *l, const struct CONCAT(SYS_SYSCALL, _args) *uap, 51 register_t *rval) 52 { 53 /* { 54 syscallarg(int) code; 55 syscallarg(register_t) args[SYS_MAXSYSARGS]; 56 } */ 57 const struct sysent *callp; 58 struct proc *p = l->l_proc; 59 int code; 60 int error; 61 int narg; 62 #ifdef NETBSD32_SYSCALL 63 register_t args64[SYS_MAXSYSARGS]; 64 int i; 65 #define TRACE_ARGS args64 66 #else 67 #define TRACE_ARGS &SCARG(uap, args[0]) 68 #endif 69 70 callp = p->p_emul->e_sysent; 71 72 code = SCARG(uap, code) & (SYS_NSYSENT - 1); 73 SYSCALL_COUNT(syscall_counts, code); 74 callp += code; 75 76 if (__predict_false(callp->sy_flags & SYCALL_INDIRECT)) 77 return ENOSYS; 78 79 if (__predict_true(!p->p_trace_enabled)) 80 return callp->sy_call(l, &uap->args, rval); 81 82 narg = callp->sy_narg; 83 #ifdef NETBSD32_SYSCALL 84 for (i = 0; i < narg; i++) 85 args64[i] = SCARG(uap, args[i]); 86 #endif 87 88 error = trace_enter(code, TRACE_ARGS, narg); 89 if (__predict_false(error != 0)) 90 return error; 91 error = callp->sy_call(l, &uap->args, rval); 92 trace_exit(code, rval, error); 93 return error; 94 95 #undef TRACE_ARGS 96 } 97