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SYS.h revision 1.15 
      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. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  *	from: @(#)SYS.h	5.5 (Berkeley) 5/7/91
     37  *	$NetBSD: SYS.h,v 1.15 2000/02/19 21:04:58 mycroft Exp $
     38  */
     39 
     40 #include <machine/asm.h>
     41 #include <sys/syscall.h>
     42 
     43 #ifdef __STDC__
     44 #define SYSTRAP(x)	movl $(SYS_ ## x),%eax; int $0x80
     45 #else
     46 #define SYSTRAP(x)	movl $(SYS_/**/x),%eax; int $0x80
     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 #define _SYSCALL_NOERROR(x,y)						\
     58 	ENTRY(x);							\
     59 	SYSTRAP(y)
     60 
     61 #ifdef PIC
     62 #define _SYSCALL(x,y)							\
     63 	.text; _ALIGN_TEXT;						\
     64 	2: PIC_PROLOGUE;						\
     65 	   mov PIC_GOT(CERROR), %ecx;					\
     66 	   PIC_EPILOGUE;						\
     67 	   jmp %ecx;							\
     68 	_SYSCALL_NOERROR(x,y);						\
     69 	jc 2b
     70 #else
     71 #define _SYSCALL(x,y)							\
     72 	.text; _ALIGN_TEXT;						\
     73 	2: jmp CERROR;							\
     74 	_SYSCALL_NOERROR(x,y);						\
     75 	jc 2b
     76 #endif
     77 
     78 #define SYSCALL_NOERROR(x)						\
     79 	_SYSCALL_NOERROR(x,x)
     80 
     81 #define SYSCALL(x)							\
     82 	_SYSCALL(x,x)
     83 
     84 #define PSEUDO_NOERROR(x,y)						\
     85 	_SYSCALL_NOERROR(x,y);						\
     86 	ret
     87 
     88 #define PSEUDO(x,y)							\
     89 	_SYSCALL(x,y);							\
     90 	ret
     91 
     92 #define RSYSCALL_NOERROR(x)						\
     93 	PSEUDO_NOERROR(x,x)
     94 
     95 #define RSYSCALL(x)							\
     96 	PSEUDO(x,x)
     97 
     98 
     99 	.globl	CERROR
    100