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SYS.h revision 1.9 
      1 /*	$NetBSD: SYS.h,v 1.9 2002/05/07 01:31:33 eeh 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 #ifdef BIGPIC
     60 #define	JUMP(name) \
     61 	PIC_PROLOGUE(%g1,%g5); \
     62 	sethi %hi(_C_LABEL(name)),%g5; \
     63 	or %g5,%lo(_C_LABEL(name)),%g5; \
     64 	ldx [%g1+%g5],%g5; \
     65 	jmp %g5; \
     66 	nop
     67 #else
     68 #define	JUMP(name) \
     69 	PIC_PROLOGUE(%g1,%g5); \
     70 	ldx [%g1+_C_LABEL(name)],%g5; jmp %g5; nop
     71 #endif
     72 #else
     73 #define	JUMP(name)	set _C_LABEL(name),%g1; jmp %g1; nop
     74 #endif
     75 #define	ERROR()		JUMP(__cerror)
     76 /*
     77  * SYSCALL is used when further action must be taken before returning.
     78  * Note that it adds a `nop' over what we could do, if we only knew what
     79  * came at label 1....
     80  */
     81 #define	_SYSCALL(x,y) \
     82 	ENTRY(x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1:
     83 
     84 #define	SYSCALL(x) \
     85 	_SYSCALL(x,x)
     86 
     87 /*
     88  * RSYSCALL is used when the system call should just return.  Here
     89  * we use the SYSCALL_G2RFLAG to put the `success' return address in %g2
     90  * and avoid a branch.
     91  */
     92 #define	RSYSCALL(x) \
     93 	ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
     94 	t ST_SYSCALL; ERROR()
     95 
     96 /*
     97  * PSEUDO(x,y) is like RSYSCALL(y) except that the name is x.
     98  */
     99 #define	PSEUDO(x,y) \
    100 	ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
    101 	t ST_SYSCALL; ERROR()
    102 
    103 /*
    104  * WSYSCALL(weak,strong) is like RSYSCALL(weak), except that weak is
    105  * a weak internal alias for the strong symbol.
    106  */
    107 #define	WSYSCALL(weak,strong) \
    108 	WEAK_ALIAS(weak,strong); \
    109 	PSEUDO(strong,weak)
    110 
    111 /*
    112  * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls
    113  * that never fail.
    114  *
    115  * XXX - This should be optimized.
    116  */
    117 #define SYSCALL_NOERROR(x) \
    118 	ENTRY(x); mov _CAT(SYS_,x),%g1; t ST_SYSCALL
    119 
    120 /*
    121  * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls
    122  * that never fail.
    123  *
    124  * XXX - This should be optimized.
    125  */
    126 #define RSYSCALL_NOERROR(x) \
    127 	ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
    128 	t ST_SYSCALL
    129 
    130 /*
    131  * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y) except that the name is x.
    132  */
    133 #define PSEUDO_NOERROR(x,y) \
    134 	ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
    135 	t ST_SYSCALL
    136 
    137 	.register	%g2,#scratch
    138 
    139 	.globl	_C_LABEL(__cerror)
    140