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SYS.h revision 1.13 
      1 /*	$NetBSD: SYS.h,v 1.13 2003/08/07 16:42:26 agc 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 #ifdef PIC
     55 #ifdef BIGPIC
     56 #define	JUMP(name) \
     57 	PIC_PROLOGUE(%g1,%g5); \
     58 	sethi %hi(_C_LABEL(name)),%g5; \
     59 	or %g5,%lo(_C_LABEL(name)),%g5; \
     60 	ldx [%g1+%g5],%g5; \
     61 	jmp %g5; \
     62 	nop
     63 #else
     64 #define	JUMP(name) \
     65 	PIC_PROLOGUE(%g1,%g5); \
     66 	ldx [%g1+_C_LABEL(name)],%g5; jmp %g5; nop
     67 #endif
     68 #else
     69 #define	JUMP(name)	set _C_LABEL(name),%g1; jmp %g1; nop
     70 #endif
     71 #define	ERROR()		JUMP(__cerror)
     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_G7RFLAG to put the `success' return address in %g7
     86  * and avoid a branch.
     87  */
     88 #define	RSYSCALL(x) \
     89 	ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G7RFLAG,%g1; add %o7,8,%g7; \
     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_G7RFLAG,%g1; add %o7,8,%g7; \
     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_G7RFLAG,%g1; add %o7,8,%g7; \
    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_G7RFLAG,%g1; add %o7,8,%g7; \
    131 	t ST_SYSCALL
    132 
    133 	.register	%g7,#scratch
    134 
    135 	.globl	_C_LABEL(__cerror)
    136