Home | History | Annotate | Line # | Download | only in sys 
      1 /* $NetBSD: sbrk.S,v 1.9 2001/05/07 17:19:18 kleink Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1994, 1995 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 #include "SYS.h"
     31 
     32 	.globl	_end
     33 
     34 #ifdef WEAK_ALIAS
     35 WEAK_ALIAS(sbrk, _sbrk)
     36 #endif
     37 
     38 	.data
     39 EXPORT(__curbrk)
     40 	.quad	_end
     41 
     42 	.text
     43 LEAF(_sbrk, 1)
     44 	br	pv, L1				/* XXX profiling */
     45 L1:	LDGP(pv)
     46 	ldq	a1, __curbrk
     47 	addq	a0, a1, a0
     48 	CALLSYS_ERROR(break)
     49 	stq	a0, __curbrk
     50 	mov	a1, v0
     51 	RET
     52 END(_sbrk)
     53