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SYS.h revision 1.14.4.1 
      1 /*	$NetBSD: SYS.h,v 1.14.4.1 2014/05/22 11:36:49 yamt 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. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)SYS.h	8.1 (Berkeley) 6/4/93
     36  *
     37  *	from: Header: SYS.h,v 1.2 92/07/03 18:57:00 torek Exp
     38  */
     39 
     40 #include <machine/asm.h>
     41 #include <sys/syscall.h>
     42 #include <machine/trap.h>
     43 
     44 #ifdef __STDC__
     45 #define _CAT(x,y) x##y
     46 #else
     47 #define _CAT(x,y) x/**/y
     48 #endif
     49 
     50 /*
     51  * ERROR branches to cerror.  This is done with a macro so that I can
     52  * change it to be position independent later, if need be.
     53  */
     54 #if __PIC__ - 0 >= 2
     55 #define	JUMP(name) \
     56 	PIC_PROLOGUE(%g1,%g5); \
     57 	sethi %hi(_C_LABEL(name)),%g5; \
     58 	or %g5,%lo(_C_LABEL(name)),%g5; \
     59 	ldx [%g1+%g5],%g5; \
     60 	jmp %g5; \
     61 	nop
     62 #elif __PIC__ - 0 >= 1
     63 #define	JUMP(name) \
     64 	PIC_PROLOGUE(%g1,%g5); \
     65 	ldx [%g1+_C_LABEL(name)],%g5; jmp %g5; nop
     66 #else
     67 #define	JUMP(name)	set _C_LABEL(name),%g1; jmp %g1; nop
     68 #endif
     69 #define	ERROR()		JUMP(__cerror)
     70 /*
     71  * SYSCALL is used when further action must be taken before returning.
     72  * Note that it adds a `nop' over what we could do, if we only knew what
     73  * came at label 1....
     74  */
     75 #define	_SYSCALL(x,y) \
     76 	ENTRY(x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1:
     77 
     78 #define	SYSCALL(x) \
     79 	_SYSCALL(x,x)
     80 
     81 /*
     82  * RSYSCALL is used when the system call should just return.  Here
     83  * we use the SYSCALL_G5RFLAG to put the `success' return address in %g5
     84  * and avoid a branch.
     85  */
     86 #define	RSYSCALL(x) \
     87 	ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G5RFLAG,%g1; add %o7,8,%g5; \
     88 	t ST_SYSCALL; ERROR()
     89 
     90 /*
     91  * PSEUDO(x,y) is like RSYSCALL(y) except that the name is x.
     92  */
     93 #define	PSEUDO(x,y) \
     94 	ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G5RFLAG,%g1; add %o7,8,%g5; \
     95 	t ST_SYSCALL; ERROR()
     96 
     97 /*
     98  * WSYSCALL(weak,strong) is like RSYSCALL(weak), except that weak is
     99  * a weak internal alias for the strong symbol.
    100  */
    101 #define	WSYSCALL(weak,strong) \
    102 	WEAK_ALIAS(weak,strong); \
    103 	PSEUDO(strong,weak)
    104 
    105 /*
    106  * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls
    107  * that never fail.
    108  *
    109  * XXX - This should be optimized.
    110  */
    111 #define SYSCALL_NOERROR(x) \
    112 	ENTRY(x); mov _CAT(SYS_,x),%g1; t ST_SYSCALL
    113 
    114 /*
    115  * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls
    116  * that never fail.
    117  *
    118  * XXX - This should be optimized.
    119  */
    120 #define RSYSCALL_NOERROR(x) \
    121 	ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G5RFLAG,%g1; add %o7,8,%g5; \
    122 	t ST_SYSCALL
    123 
    124 /*
    125  * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y) except that the name is x.
    126  */
    127 #define PSEUDO_NOERROR(x,y) \
    128 	ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G5RFLAG,%g1; add %o7,8,%g5; \
    129 	t ST_SYSCALL
    130 
    131 	.globl	_C_LABEL(__cerror)
    132