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SYS.h revision 1.8 
      1 /*	$NetBSD: SYS.h,v 1.8 2002/05/05 17:51:46 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This software was developed by the Computer Systems Engineering group
      8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  * contributed to Berkeley.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Berkeley and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  *
     39  *	@(#)SYS.h	8.1 (Berkeley) 6/4/93
     40  *
     41  *	from: Header: SYS.h,v 1.2 92/07/03 18:57:00 torek Exp
     42  */
     43 
     44 #include <machine/asm.h>
     45 #include <sys/syscall.h>
     46 #include <machine/trap.h>
     47 
     48 #ifdef __STDC__
     49 #define _CAT(x,y) x##y
     50 #else
     51 #define _CAT(x,y) x/**/y
     52 #endif
     53 
     54 /*
     55  * ERROR branches to cerror.  This is done with a macro so that I can
     56  * change it to be position independent later, if need be.
     57  */
     58 #ifdef PIC
     59 #define	CALL(name) \
     60 	PIC_PROLOGUE(%g1,%g2); \
     61 	sethi %hi(name),%g2; \
     62 	or %g2,%lo(name),%g2; \
     63 	ldx [%g1+%g2],%g2; \
     64 	jmp %g2; \
     65 	nop
     66 #else
     67 #define	CALL(name) \
     68 	sethi %hi(name),%g1; or %lo(name),%g1,%g1; \
     69 	jmp %g1; nop
     70 #endif
     71 #define	ERROR()	CALL(_C_LABEL(__cerror))
     72 
     73 /*
     74  * SYSCALL is used when further action must be taken before returning.
     75  * Note that it adds a `nop' over what we could do, if we only knew what
     76  * came at label 1....
     77  */
     78 #define	_SYSCALL(x,y) \
     79 	ENTRY(x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1:
     80 
     81 #define	SYSCALL(x) \
     82 	_SYSCALL(x,x)
     83 
     84 /*
     85  * RSYSCALL is used when the system call should just return.  Here
     86  * we use the SYSCALL_G2RFLAG to put the `success' return address in %g2
     87  * and avoid a branch.
     88  */
     89 #define	RSYSCALL(x) \
     90 	ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
     91 	t ST_SYSCALL; ERROR()
     92 
     93 /*
     94  * PSEUDO(x,y) is like RSYSCALL(y) except that the name is x.
     95  */
     96 #define	PSEUDO(x,y) \
     97 	ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
     98 	t ST_SYSCALL; ERROR()
     99 
    100 /*
    101  * WSYSCALL(weak,strong) is like RSYSCALL(weak), except that weak is
    102  * a weak internal alias for the strong symbol.
    103  */
    104 #define	WSYSCALL(weak,strong) \
    105 	WEAK_ALIAS(weak,strong); \
    106 	PSEUDO(strong,weak)
    107 
    108 /*
    109  * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls
    110  * that never fail.
    111  *
    112  * XXX - This should be optimized.
    113  */
    114 #define SYSCALL_NOERROR(x) \
    115 	ENTRY(x); mov _CAT(SYS_,x),%g1; t ST_SYSCALL
    116 
    117 /*
    118  * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls
    119  * that never fail.
    120  *
    121  * XXX - This should be optimized.
    122  */
    123 #define RSYSCALL_NOERROR(x) \
    124 	ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
    125 	t ST_SYSCALL
    126 
    127 /*
    128  * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y) except that the name is x.
    129  */
    130 #define PSEUDO_NOERROR(x,y) \
    131 	ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
    132 	t ST_SYSCALL
    133 
    134 	.register	%g2,#scratch
    135 
    136 	.globl	_C_LABEL(__cerror)
    137