| 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 | |
| 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 | #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 | |