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brk.S revision 1.9 
      1  1.9  kleink /* $NetBSD: brk.S,v 1.9 2001/05/07 17:19:17 kleink Exp $ */
      2  1.1     cgd 
      3  1.1     cgd /*
      4  1.1     cgd  * Copyright (c) 1994, 1995 Carnegie-Mellon University.
      5  1.1     cgd  * All rights reserved.
      6  1.1     cgd  *
      7  1.1     cgd  * Author: Chris G. Demetriou
      8  1.1     cgd  *
      9  1.1     cgd  * Permission to use, copy, modify and distribute this software and
     10  1.1     cgd  * its documentation is hereby granted, provided that both the copyright
     11  1.1     cgd  * notice and this permission notice appear in all copies of the
     12  1.1     cgd  * software, derivative works or modified versions, and any portions
     13  1.1     cgd  * thereof, and that both notices appear in supporting documentation.
     14  1.1     cgd  *
     15  1.1     cgd  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  1.1     cgd  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  1.1     cgd  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  1.1     cgd  *
     19  1.1     cgd  * Carnegie Mellon requests users of this software to return to
     20  1.1     cgd  *
     21  1.1     cgd  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  1.1     cgd  *  School of Computer Science
     23  1.1     cgd  *  Carnegie Mellon University
     24  1.1     cgd  *  Pittsburgh PA 15213-3890
     25  1.1     cgd  *
     26  1.1     cgd  * any improvements or extensions that they make and grant Carnegie the
     27  1.1     cgd  * rights to redistribute these changes.
     28  1.1     cgd  */
     29  1.1     cgd 
     30  1.1     cgd #include "SYS.h"
     31  1.1     cgd 
     32  1.1     cgd 	.globl	_end
     33  1.5  kleink IMPORT(__curbrk, 8)
     34  1.1     cgd 
     35  1.7  kleink #ifdef WEAK_ALIAS
     36  1.7  kleink WEAK_ALIAS(brk, _brk)
     37  1.7  kleink #endif
     38  1.7  kleink 
     39  1.1     cgd 	.data
     40  1.5  kleink EXPORT(__minbrk)
     41  1.1     cgd 	.quad	_end
     42  1.1     cgd 
     43  1.1     cgd 	.text
     44  1.7  kleink LEAF(_brk, 1)
     45  1.3     cgd 	br	pv, L1				/* XXX profiling */
     46  1.4     cgd L1:	LDGP(pv)
     47  1.5  kleink 	ldq	v0, __minbrk
     48  1.1     cgd 	cmpult  a0, v0, t0
     49  1.1     cgd 	cmovne  t0, v0, a0
     50  1.4     cgd 	CALLSYS_ERROR(break)
     51  1.5  kleink 	stq	a0, __curbrk
     52  1.1     cgd 	mov	zero, v0
     53  1.1     cgd 	RET
     54  1.9  kleink END(_brk)
     55