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SYS.h revision 1.7 
      1 /*-
      2  * Copyright (c) 1992, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * This software was developed by the Computer Systems Engineering group
      6  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      7  * contributed to Berkeley.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Berkeley and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  *
     37  *	@(#)SYS.h	8.1 (Berkeley) 6/4/93
     38  *
     39  *	from: Header: SYS.h,v 1.2 92/07/03 18:57:00 torek Exp
     40  *	$NetBSD: SYS.h,v 1.7 2002/01/14 00:55:56 thorpej Exp $
     41  */
     42 
     43 #include <machine/asm.h>
     44 #include <sys/syscall.h>
     45 #include <machine/trap.h>
     46 
     47 #ifdef __STDC__
     48 #define _CAT(x,y) x##y
     49 #else
     50 #define _CAT(x,y) x/**/y
     51 #endif
     52 
     53 /*
     54  * ERROR branches to cerror.  This is done with a macro so that I can
     55  * change it to be position independent later, if need be.
     56  */
     57 #ifdef PIC
     58 #define	CALL(name) \
     59 	PIC_PROLOGUE(%g1,%g2); \
     60 	sethi %hi(name),%g2; \
     61 	or %g2,%lo(name),%g2; \
     62 	ldx [%g1+%g2],%g2; \
     63 	jmp %g2; \
     64 	nop
     65 #else
     66 #define	CALL(name) \
     67 	sethi %hi(name),%g1; or %lo(name),%g1,%g1; \
     68 	jmp %g1; nop
     69 #endif
     70 #define	ERROR()	CALL(_C_LABEL(__cerror))
     71 
     72 /*
     73  * SYSCALL is used when further action must be taken before returning.
     74  * Note that it adds a `nop' over what we could do, if we only knew what
     75  * came at label 1....
     76  */
     77 #define	_SYSCALL(x,y) \
     78 	ENTRY(x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1:
     79 
     80 #define	SYSCALL(x) \
     81 	_SYSCALL(x,x)
     82 
     83 /*
     84  * RSYSCALL is used when the system call should just return.  Here
     85  * we use the SYSCALL_G2RFLAG to put the `success' return address in %g2
     86  * and avoid a branch.
     87  */
     88 #define	RSYSCALL(x) \
     89 	ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
     90 	t ST_SYSCALL; ERROR()
     91 
     92 /*
     93  * PSEUDO(x,y) is like RSYSCALL(y) except that the name is x.
     94  */
     95 #define	PSEUDO(x,y) \
     96 	ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
     97 	t ST_SYSCALL; ERROR()
     98 
     99 /*
    100  * WSYSCALL(weak,strong) is like RSYSCALL(weak), except that weak is
    101  * a weak internal alias for the strong symbol.
    102  */
    103 #define	WSYSCALL(weak,strong) \
    104 	WEAK_ALIAS(weak,strong); \
    105 	PSEUDO(strong,weak)
    106 
    107 /*
    108  * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls
    109  * that never fail.
    110  *
    111  * XXX - This should be optimized.
    112  */
    113 #define SYSCALL_NOERROR(x) \
    114 	ENTRY(x); mov _CAT(SYS_,x),%g1; t ST_SYSCALL
    115 
    116 /*
    117  * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls
    118  * that never fail.
    119  *
    120  * XXX - This should be optimized.
    121  */
    122 #define RSYSCALL_NOERROR(x) \
    123 	ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
    124 	t ST_SYSCALL
    125 
    126 /*
    127  * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y) except that the name is x.
    128  */
    129 #define PSEUDO_NOERROR(x,y) \
    130 	ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
    131 	t ST_SYSCALL
    132 
    133 	.globl	_C_LABEL(__cerror)
    134