1 /* $NetBSD: sys_syscall.c,v 1.10 2012/05/05 19:44:02 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 1.10 2012/05/05 19:44:02 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 47 int 48 SYS_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 int narg; 60 #ifdef NETBSD32_SYSCALL 61 register_t args64[SYS_MAXSYSARGS]; 62 int i; 63 #define TRACE_ARGS args64 64 #else 65 #define TRACE_ARGS &SCARG(uap, args[0]) 66 #endif 67 68 callp = p->p_emul->e_sysent; 69 70 code = SCARG(uap, code) & (SYS_NSYSENT - 1); 71 SYSCALL_COUNT(syscall_counts, code); 72 callp += code; 73 74 if (__predict_false(callp->sy_flags & SYCALL_INDIRECT)) 75 return ENOSYS; 76 77 if (__predict_true(!p->p_trace_enabled)) 78 return sy_call(callp, l, &uap->args, rval); 79 80 narg = callp->sy_narg; 81 #ifdef NETBSD32_SYSCALL 82 for (i = 0; i < narg; i++) 83 args64[i] = SCARG(uap, args[i]); 84 #endif 85 86 error = trace_enter(code, TRACE_ARGS, narg); 87 if (__predict_false(error != 0)) 88 return error; 89 error = sy_call(callp, l, &uap->args, rval); 90 trace_exit(code, rval, error); 91 return error; 92 93 #undef TRACE_ARGS 94 } 95