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SYS.h revision 1.10 
      1 /*-
      2  * Copyright (c) 1990 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * William Jolitz.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. Neither the name of the University nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  *
     32  *	from: @(#)SYS.h	5.5 (Berkeley) 5/7/91
     33  *	$NetBSD: SYS.h,v 1.10 2007/11/23 07:36:05 dsl Exp $
     34  */
     35 
     36 #include <machine/asm.h>
     37 #include <sys/syscall.h>
     38 
     39 #ifdef __STDC__
     40 #define SYSTRAP(x)	movl $(SYS_ ## x),%eax; movq %rcx, %r10; syscall
     41 #else
     42 #define SYSTRAP(x)	movl $(SYS_/**/x),%eax; movq %rcx, %r10; syscall
     43 #endif
     44 
     45 #define CERROR		_C_LABEL(__cerror)
     46 #define CURBRK		_C_LABEL(__curbrk)
     47 
     48 #define _SYSCALL_NOERROR(x,y)						\
     49 	ENTRY(x);							\
     50 	SYSTRAP(y)
     51 
     52 #ifdef PIC
     53 #define _SYSCALL_ERR	 						\
     54 	mov PIC_GOT(CERROR), %rcx;					\
     55 	jmp *%rcx
     56 #else
     57 #define _SYSCALL_ERR							\
     58 	jmp CERROR
     59 #endif
     60 
     61 #define _SYSCALL(x,y)							\
     62 	.text; _ALIGN_TEXT;						\
     63 	2: _SYSCALL_ERR;						\
     64 	_SYSCALL_NOERROR(x,y);						\
     65 	jc 2b
     66 
     67 #define SYSCALL_NOERROR(x)						\
     68 	_SYSCALL_NOERROR(x,x)
     69 
     70 #define SYSCALL(x)							\
     71 	_SYSCALL(x,x)
     72 
     73 #define PSEUDO_NOERROR(x,y)						\
     74 	_SYSCALL_NOERROR(x,y);						\
     75 	ret
     76 
     77 #define PSEUDO(x,y)							\
     78 	_SYSCALL_NOERROR(x,y);						\
     79 	jc 2f;								\
     80 	ret;								\
     81 	2: _SYSCALL_ERR
     82 
     83 #define RSYSCALL_NOERROR(x)						\
     84 	PSEUDO_NOERROR(x,x)
     85 
     86 #define RSYSCALL(x)							\
     87 	PSEUDO(x,x)
     88 
     89 #define	WSYSCALL(weak,strong)						\
     90 	WEAK_ALIAS(weak,strong);					\
     91 	PSEUDO(strong,weak)
     92 
     93 	.globl	CERROR
     94