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sbrk.S revision 1.1 
      1 /*	$NetBSD: sbrk.S,v 1.1 1997/03/29 20:56:06 thorpej 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. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Berkeley and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  *
     39  * from: Header: sbrk.s,v 1.3 92/07/02 00:56:49 torek Exp
     40  */
     41 
     42 #if defined(LIBC_SCCS) && !defined(lint)
     43 	.asciz "@(#)sbrk.s	8.1 (Berkeley) 6/4/93"
     44 #endif /* LIBC_SCCS and not lint */
     45 
     46 #include "SYS.h"
     47 
     48 	.globl	_end
     49 	.globl	curbrk
     50 
     51 	.data
     52 curbrk:	.long	_end
     53 	.text
     54 
     55 ENTRY(sbrk)
     56 #ifdef PIC
     57 	 XXX
     58 #else
     59 	lis	5,curbrk@ha
     60 	lwz	6,curbrk@l(5)			# r6 = old break
     61 	add	3,3,6
     62 	mr	7,3				# r7 = new break
     63 	li	0,SYS_break
     64 	sc					# break(new_break)
     65 	bso	1f
     66 	mr	3,6				# set return value
     67 	stw	7,curbrk@l(5)			# record new break
     68 	blr
     69 1:
     70 	b	cerror
     71 #endif
     72