1 /* $NetBSD: SYS.h,v 1.5 2023/05/19 06:41:41 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2014,2022 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, and Nick Hudson. 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) \ 36 li t6, SYS_ ## x; \ 37 ecall 38 39 #define JUMP_TO_CERROR() \ 40 .option push ;\ 41 .option norelax ;\ 42 tail _C_LABEL(__cerror) ;\ 43 .option pop 44 45 #define SYSTRAP_NOERROR(x) \ 46 SYSTRAP(x) ;\ 47 nop; nop /* size of ... */ ;\ 48 nop; nop /* JUMP_TO_CERROR */ ;\ 49 50 /* 51 * Do a syscall that cannot fail (sync, get{p,u,g,eu,eg)id) 52 */ 53 #define RSYSCALL_NOERROR(x) \ 54 PSEUDO_NOERROR(x,x) 55 56 /* 57 * Do a normal syscall. 58 */ 59 #define RSYSCALL(x) \ 60 PSEUDO(x,x) 61 62 /* 63 * Do a syscall that has an internal name and a weak external alias. 64 */ 65 #define WSYSCALL(weak,strong) \ 66 WEAK_ALIAS(weak,strong) ;\ 67 PSEUDO(strong,weak) 68 69 /* 70 * Do a renamed or pseudo syscall (e.g., _exit()), where the entrypoint 71 * and syscall name are not the same. 72 */ 73 #define PSEUDO_NOERROR(x,y) \ 74 ENTRY(x) ;\ 75 SYSTRAP_NOERROR(y) ;\ 76 ret /* success */ ;\ 77 END(x) 78 79 #define PSEUDO(x,y) \ 80 ENTRY(x) ;\ 81 SYSTRAP(y) ;\ 82 JUMP_TO_CERROR() /* error */ ;\ 83 ret /* success */ ;\ 84 END(x) 85