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sbrk.S revision 1.1 
      1  1.1  cgd /*
      2  1.1  cgd  * Copyright (c) 1992, 1993
      3  1.1  cgd  *	The Regents of the University of California.  All rights reserved.
      4  1.1  cgd  *
      5  1.1  cgd  * This software was developed by the Computer Systems Engineering group
      6  1.1  cgd  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      7  1.1  cgd  * contributed to Berkeley.
      8  1.1  cgd  *
      9  1.1  cgd  * Redistribution and use in source and binary forms, with or without
     10  1.1  cgd  * modification, are permitted provided that the following conditions
     11  1.1  cgd  * are met:
     12  1.1  cgd  * 1. Redistributions of source code must retain the above copyright
     13  1.1  cgd  *    notice, this list of conditions and the following disclaimer.
     14  1.1  cgd  * 2. Redistributions in binary form must reproduce the above copyright
     15  1.1  cgd  *    notice, this list of conditions and the following disclaimer in the
     16  1.1  cgd  *    documentation and/or other materials provided with the distribution.
     17  1.1  cgd  * 3. All advertising materials mentioning features or use of this software
     18  1.1  cgd  *    must display the following acknowledgement:
     19  1.1  cgd  *	This product includes software developed by the University of
     20  1.1  cgd  *	California, Berkeley and its contributors.
     21  1.1  cgd  * 4. Neither the name of the University nor the names of its contributors
     22  1.1  cgd  *    may be used to endorse or promote products derived from this software
     23  1.1  cgd  *    without specific prior written permission.
     24  1.1  cgd  *
     25  1.1  cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  1.1  cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  1.1  cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  1.1  cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  1.1  cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  1.1  cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  1.1  cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  1.1  cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  1.1  cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  1.1  cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  1.1  cgd  * SUCH DAMAGE.
     36  1.1  cgd  *
     37  1.1  cgd  * from: Header: sbrk.s,v 1.3 92/07/02 00:56:49 torek Exp
     38  1.1  cgd  * $Id: sbrk.S,v 1.1 1993/10/07 00:22:24 cgd Exp $
     39  1.1  cgd  */
     40  1.1  cgd 
     41  1.1  cgd #if defined(LIBC_SCCS) && !defined(lint)
     42  1.1  cgd 	.asciz "@(#)sbrk.s	8.1 (Berkeley) 6/4/93"
     43  1.1  cgd #endif /* LIBC_SCCS and not lint */
     44  1.1  cgd 
     45  1.1  cgd #include "SYS.h"
     46  1.1  cgd 
     47  1.1  cgd 	.globl	_end
     48  1.1  cgd 	.globl	curbrk
     49  1.1  cgd 
     50  1.1  cgd 	.data
     51  1.1  cgd curbrk:	.long	_end
     52  1.1  cgd 	.text
     53  1.1  cgd 
     54  1.1  cgd ENTRY(sbrk)
     55  1.1  cgd 	sethi	%hi(curbrk), %o2
     56  1.1  cgd 	ld	[%o2 + %lo(curbrk)], %o3	! %o3 = old break
     57  1.1  cgd 	add	%o3, %o0, %o4			! %o4 = new break
     58  1.1  cgd 	mov	%o4, %o0			! copy for syscall
     59  1.1  cgd 	mov	SYS_break, %g1
     60  1.1  cgd 	t	ST_SYSCALL			! break(new_break)
     61  1.1  cgd 	bcc,a	1f				! if success,
     62  1.1  cgd 	 mov	%o3, %o0			!    set return value
     63  1.1  cgd 	ERROR()
     64  1.1  cgd 1:
     65  1.1  cgd 	retl					! and update curbrk
     66  1.1  cgd 	 st	%o4, [%o2 + %lo(curbrk)]
     67