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SYS.h revision 1.15 
      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 1.15 2003/08/07 16:42:23 agc 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.  This is done with a macro so that I can
     59  * change it to be position independent later, if need be.
     60  */
     61 #ifdef PIC
     62 #define CALL(name) \
     63 	PIC_PROLOGUE(%g1,%g2); \
     64 	ld [%g1+name],%g2; jmp %g2; nop
     65 #else
     66 #define	CALL(name) \
     67 	sethi %hi(name),%g1; or %lo(name),%g1,%g1; jmp %g1; nop
     68 #endif
     69 #define	ERROR() CALL(CERROR)
     70 
     71 /*
     72  * SYSCALL is used when further action must be taken before returning.
     73  * Note that it adds a `nop' over what we could do, if we only knew what
     74  * came at label 1....
     75  */
     76 #define	_SYSCALL(x,y) \
     77 	ENTRY(x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1:
     78 
     79 #define	SYSCALL(x) \
     80 	_SYSCALL(x,x)
     81 
     82 /*
     83  * RSYSCALL is used when the system call should just return.  Here
     84  * we use the SYSCALL_G2RFLAG to put the `success' return address in %g2
     85  * and avoid a branch.
     86  */
     87 #define	RSYSCALL(x) \
     88 	ENTRY(x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
     89 	t ST_SYSCALL; ERROR()
     90 
     91 /*
     92  * PSEUDO(x,y) is like RSYSCALL(y) except that the name is x.
     93  */
     94 #define	PSEUDO(x,y) \
     95 	ENTRY(x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
     96 	t ST_SYSCALL; ERROR()
     97 
     98 /*
     99  * WSYSCALL(weak,strong) is like RSYSCALL(weak), except that weak is
    100  * a weak internal alias for the strong symbol.
    101  */
    102 #ifdef WEAK_ALIAS
    103 #define	WSYSCALL(weak,strong) \
    104 	WEAK_ALIAS(weak,strong); \
    105 	PSEUDO(strong,weak)
    106 #else
    107 #define	WSYSCALL(weak,strong) \
    108 	RSYSCALL(weak)
    109 #endif
    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 	.globl	CERROR
    138