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brk.S revision 1.9 
      1 /* $NetBSD: brk.S,v 1.9 2001/05/07 17:19:17 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 IMPORT(__curbrk, 8)
     34 
     35 #ifdef WEAK_ALIAS
     36 WEAK_ALIAS(brk, _brk)
     37 #endif
     38 
     39 	.data
     40 EXPORT(__minbrk)
     41 	.quad	_end
     42 
     43 	.text
     44 LEAF(_brk, 1)
     45 	br	pv, L1				/* XXX profiling */
     46 L1:	LDGP(pv)
     47 	ldq	v0, __minbrk
     48 	cmpult  a0, v0, t0
     49 	cmovne  t0, v0, a0
     50 	CALLSYS_ERROR(break)
     51 	stq	a0, __curbrk
     52 	mov	zero, v0
     53 	RET
     54 END(_brk)
     55