Home | History | Annotate | Line # | Download | only in riscv
SYS.h revision 1.1 
      1 /*	$NetBSD: SYS.h,v 1.1 2014/09/19 17:36:25 matt 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	v0,SYS_ ## x; scall
     36 #define	JUMP_TO_CERROR()	j	_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