1 /* $NetBSD: SYS.h,v 1.3 2019/04/13 16:08:54 maya Exp $ */ 2 3 /*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matt Thomas of 3am Software Foundry. 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/syscall.h> 33 #include <machine/asm.h> 34 35 #define SYSTRAP(x) li t6,SYS_ ## x; scall 36 #define JUMP_TO_CERROR() tail _C_LABEL(__cerror) 37 38 /* 39 * Do a syscall that cannot fail (sync, get{p,u,g,eu,eg)id) 40 */ 41 #define RSYSCALL_NOERROR(x) \ 42 PSEUDO_NOERROR(x,x) 43 44 /* 45 * Do a normal syscall. 46 */ 47 #define RSYSCALL(x) \ 48 PSEUDO(x,x) 49 50 /* 51 * Do a syscall that has an internal name and a weak external alias. 52 */ 53 #define WSYSCALL(weak,strong) \ 54 WEAK_ALIAS(weak,strong) ;\ 55 PSEUDO(strong,weak) 56 57 /* 58 * Do a renamed or pseudo syscall (e.g., _exit()), where the entrypoint 59 * and syscall name are not the same. 60 */ 61 #define PSEUDO_NOERROR(x,y) \ 62 ENTRY(x); ;\ 63 SYSTRAP(y) ;\ 64 ret /* error */ ;\ 65 ret /* success */ ;\ 66 END(x) 67 68 #define PSEUDO(x,y) \ 69 ENTRY(x); ;\ 70 SYSTRAP(y) ;\ 71 JUMP_TO_CERROR() /* error */ ;\ 72 ret /* success */ ;\ 73 END(x) 74