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SYS.h revision 1.16 
      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. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *	@(#)SYS.h	8.1 (Berkeley) 6/4/93
     34  *
     35  *	from: Header: SYS.h,v 1.2 92/07/03 18:57:00 torek Exp
     36  *	$NetBSD: SYS.h,v 1.16 2005/05/20 23:56:15 uwe Exp $
     37  */
     38 
     39 #include <machine/asm.h>
     40 #include <sys/syscall.h>
     41 #include <machine/trap.h>
     42 
     43 #ifdef __STDC__
     44 #define _CAT(x,y) x##y
     45 #else
     46 #define _CAT(x,y) x/**/y
     47 #endif
     48 
     49 #ifdef __ELF__
     50 #define CERROR		_C_LABEL(__cerror)
     51 #define CURBRK		_C_LABEL(__curbrk)
     52 #else
     53 #define CERROR		_ASM_LABEL(cerror)
     54 #define CURBRK		_ASM_LABEL(curbrk)
     55 #endif
     56 
     57 /*
     58  * ERROR branches to cerror.
     59  */
     60 #ifdef PIC
     61 #define CALL(name)				\
     62 	PIC_PROLOGUE(%g1, %g2);			\
     63 	ld	[%g1 + name], %g2;		\
     64 	jmp	%g2;				\
     65 	 nop
     66 #else
     67 #define	CALL(name)				\
     68 	set	name, %g1;			\
     69 	jmp	%g1;				\
     70 	 nop
     71 #endif
     72 #define	ERROR() CALL(CERROR)
     73 
     74 /*
     75  * SYSCALL is used when further action must be taken before returning.
     76  * Note that it adds a `nop' over what we could do, if we only knew
     77  * what came at label 1....
     78  */
     79 #define	_SYSCALL(x,y)				\
     80 ENTRY(x);					\
     81 	mov	_CAT(SYS_,y), %g1;		\
     82 	t	ST_SYSCALL;			\
     83 	bcc	1f;				\
     84 	 nop;					\
     85 	ERROR();				\
     86 1:	/* next insn */
     87 
     88 #define	SYSCALL(x)				\
     89 	_SYSCALL(x,x)
     90 
     91 /*
     92  * RSYSCALL is used when the system call should just return.  Here we
     93  * use the SYSCALL_G2RFLAG to put the `success' return address in %g2
     94  * and avoid a branch.
     95  *
     96  * PSEUDO(x,y) is like RSYSCALL(y), except that the name is x.
     97  */
     98 #define	_RSYSCALL(x,y)					\
     99 ENTRY(x);						\
    100 	mov	(_CAT(SYS_,y)) | SYSCALL_G2RFLAG, %g1;	\
    101 	add	%o7, 8, %g2;				\
    102 	t	ST_SYSCALL;				\
    103 	ERROR()
    104 
    105 #define	RSYSCALL(x)	_RSYSCALL(x,x)
    106 #define	PSEUDO(x,y)	_RSYSCALL(x,y)
    107 
    108 /*
    109  * WSYSCALL(weak,strong) is like RSYSCALL(weak),
    110  * except that weak is a weak internal alias for the strong symbol.
    111  */
    112 #ifdef WEAK_ALIAS
    113 #define	WSYSCALL(weak,strong)			\
    114 	WEAK_ALIAS(weak,strong);		\
    115 	PSEUDO(strong,weak)
    116 #else
    117 #define	WSYSCALL(weak,strong)			\
    118 	RSYSCALL(weak)
    119 #endif
    120 
    121 /*
    122  * SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls that
    123  * never fail.
    124  *
    125  * XXX - This should be optimized.
    126  */
    127 #define SYSCALL_NOERROR(x)			\
    128 ENTRY(x);					\
    129 	mov	_CAT(SYS_,x), %g1;		\
    130 	t	ST_SYSCALL
    131 
    132 /*
    133  * RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls
    134  * that never fail.
    135  *
    136  * PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y), except that the
    137  * name is x.
    138  *
    139  * XXX - This should be optimized.
    140  */
    141 #define _RSYSCALL_NOERROR(x,y)				\
    142 ENTRY(x);						\
    143 	mov	(_CAT(SYS_,y)) | SYSCALL_G2RFLAG, %g1;	\
    144 	add	%o7, 8, %g2;				\
    145 	t	ST_SYSCALL
    146 
    147 #define RSYSCALL_NOERROR(x)	_RSYSCALL_NOERROR(x,x)
    148 #define PSEUDO_NOERROR(x,y)	_RSYSCALL_NOERROR(x,y)
    149 
    150 	.globl	CERROR
    151