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      1 /*	$NetBSD: brk.S,v 1.2 2006/09/23 17:39:34 cherry 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 <machine/asm.h>
     31 /* __FBSDID("$FreeBSD: src/lib/libc/ia64/sys/brk.S,v 1.4 2003/05/16 21:26:39 marcel Exp $"); */
     32 
     33 #include "SYS.h"
     34 
     35 	.globl	_end
     36 IMPORT(__curbrk, 8)
     37 
     38 	.data
     39 EXPORT(__minbrk)
     40 	.quad	_end
     41 
     42 	.text
     43 ENTRY(_brk, 1)
     44 	add	r14=@ltoff(__minbrk),gp ;;
     45 	ld8	r14=[r14] ;;
     46 	ld8	r14=[r14] ;;
     47 	cmp.ltu	p6,p0=r32,r14 ;;
     48 (p6)	mov	r32=r14 ;;
     49 	st8	[sp]=r32
     50 	CALLSYS_ERROR(break)
     51 	ld8	r15=[sp]
     52 	add	r14=@ltoff(__curbrk),gp ;;
     53 	ld8	r14=[r14] ;;
     54 	st8	[r14]=r15
     55 	mov	ret0=0
     56 	br.ret.sptk.few rp
     57 END(_brk)
     58