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SYS.h revision 1.6 
      1 /*-
      2  * Copyright (c) 1990 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * William Jolitz.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. Neither the name of the University nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  *
     32  *	from: @(#)SYS.h	5.5 (Berkeley) 5/7/91
     33  *	$NetBSD: SYS.h,v 1.6 2003/08/07 16:42:18 agc Exp $
     34  */
     35 
     36 #include <machine/asm.h>
     37 #include <sys/syscall.h>
     38 
     39 #ifdef __STDC__
     40 #define SYSTRAP(x)					\
     41 		mov.l	903f, r0;			\
     42 		.long	0xc380;	/* trapa #0x80 */	\
     43 		nop;					\
     44 		bra	904f;				\
     45 		nop;					\
     46 		.align	2;				\
     47 	903:	.long	(SYS_ ## x);			\
     48 	904:
     49 #else
     50 #define SYSTRAP(x)					\
     51 		mov.l	903f, r0;			\
     52 		trapa	#0x80;				\
     53 		nop;					\
     54 		bra	904f;				\
     55 		nop;					\
     56 		.align	2;				\
     57 	903:	.long	(SYS_/**/x);			\
     58 	904:
     59 #endif
     60 
     61 #define _SYSCALL_NOERROR(x,y)				\
     62 		ENTRY(x);				\
     63 		SYSTRAP(y)
     64 
     65 #ifdef PIC
     66 #define _SYSCALL(x,y)					\
     67 		.text;					\
     68 	911:	mov.l	912f, r3;			\
     69 		braf	r3;				\
     70 		nop;					\
     71 		.align	2;				\
     72 	912:	.long	cerror-(911b+6);		\
     73 		_SYSCALL_NOERROR(x,y);			\
     74 		bf	911b;				\
     75 		nop
     76 #else
     77 #define _SYSCALL(x,y)					\
     78 		.text;					\
     79 	911:	mov.l	912f, r3;			\
     80 		jmp	@r3;				\
     81 		nop;					\
     82 		.align	2;				\
     83 	912:	.long	cerror;				\
     84 		_SYSCALL_NOERROR(x,y);			\
     85 		bf	911b;				\
     86 		nop
     87 #endif
     88 
     89 #define SYSCALL_NOERROR(x)				\
     90 		_SYSCALL_NOERROR(x,x)
     91 
     92 #define SYSCALL(x)					\
     93 		_SYSCALL(x,x)
     94 
     95 #define PSEUDO_NOERROR(x,y)				\
     96 		_SYSCALL_NOERROR(x,y);			\
     97 		rts;					\
     98 		nop
     99 
    100 #define PSEUDO(x,y)					\
    101 		_SYSCALL(x,y);				\
    102 		rts;					\
    103 		nop
    104 
    105 #define RSYSCALL_NOERROR(x)				\
    106 		PSEUDO_NOERROR(x,x)
    107 
    108 #define RSYSCALL(x)					\
    109 		PSEUDO(x,x)
    110 
    111 #ifdef WEAK_ALIAS
    112 #define	WSYSCALL(weak,strong)				\
    113 	WEAK_ALIAS(weak,strong);			\
    114 	PSEUDO(strong,weak)
    115 #else
    116 #define	WSYSCALL(weak,strong)				\
    117 	PSEUDO(weak,weak)
    118 #endif
    119 
    120 	.globl	cerror
    121