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brk.S revision 1.7 
      1  1.7    kleink /*	$NetBSD: brk.S,v 1.7 1999/06/03 20:14:58 kleink Exp $	*/
      2  1.3  christos 
      3  1.1       cgd /*
      4  1.1       cgd  * Copyright (c) 1992, 1993
      5  1.1       cgd  *	The Regents of the University of California.  All rights reserved.
      6  1.1       cgd  *
      7  1.1       cgd  * This software was developed by the Computer Systems Engineering group
      8  1.1       cgd  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
      9  1.1       cgd  * contributed to Berkeley.
     10  1.1       cgd  *
     11  1.1       cgd  * Redistribution and use in source and binary forms, with or without
     12  1.1       cgd  * modification, are permitted provided that the following conditions
     13  1.1       cgd  * are met:
     14  1.1       cgd  * 1. Redistributions of source code must retain the above copyright
     15  1.1       cgd  *    notice, this list of conditions and the following disclaimer.
     16  1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
     17  1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
     18  1.1       cgd  *    documentation and/or other materials provided with the distribution.
     19  1.1       cgd  * 3. All advertising materials mentioning features or use of this software
     20  1.1       cgd  *    must display the following acknowledgement:
     21  1.1       cgd  *	This product includes software developed by the University of
     22  1.1       cgd  *	California, Berkeley and its contributors.
     23  1.1       cgd  * 4. Neither the name of the University nor the names of its contributors
     24  1.1       cgd  *    may be used to endorse or promote products derived from this software
     25  1.1       cgd  *    without specific prior written permission.
     26  1.1       cgd  *
     27  1.1       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  1.1       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  1.1       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  1.1       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  1.1       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  1.1       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  1.1       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  1.1       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  1.1       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  1.1       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  1.1       cgd  * SUCH DAMAGE.
     38  1.1       cgd  *
     39  1.1       cgd  * from: Header: brk.s,v 1.3 92/06/25 12:56:05 mccanne Exp
     40  1.1       cgd  */
     41  1.1       cgd 
     42  1.3  christos #include <machine/asm.h>
     43  1.3  christos #if defined(SYSLIBC_SCCS) && !defined(lint)
     44  1.3  christos #if 0
     45  1.1       cgd 	.asciz "@(#)brk.s	8.1 (Berkeley) 6/4/93"
     46  1.3  christos #else
     47  1.7    kleink 	RCSID("$NetBSD: brk.S,v 1.7 1999/06/03 20:14:58 kleink Exp $")
     48  1.3  christos #endif
     49  1.3  christos #endif /* SYSLIBC_SCCS and not lint */
     50  1.1       cgd 
     51  1.1       cgd #include "SYS.h"
     52  1.1       cgd 
     53  1.6    kleink 	.globl	CURBRK
     54  1.5    kleink 	.globl	_C_LABEL(__minbrk)
     55  1.7    kleink 	.globl	_end
     56  1.1       cgd 
     57  1.1       cgd 	.data
     58  1.5    kleink _C_LABEL(__minbrk):
     59  1.7    kleink 	.long	_end			! lower brk limit; also for gmon code
     60  1.1       cgd 	.text
     61  1.1       cgd 
     62  1.2        pk #ifdef PIC
     63  1.2        pk ENTRY(brk)
     64  1.2        pk 	PIC_PROLOGUE(%o5,%o4)
     65  1.5    kleink 	ld	[%o5 + _C_LABEL(__minbrk)], %o4
     66  1.2        pk 	ld	[%o4], %o1		! %o1 = minbrk
     67  1.2        pk 	cmp	%o1, %o0		! if (minbrk > %o0)
     68  1.2        pk 	bg,a	0f
     69  1.2        pk 	 mov	%o1, %o0		!	%o0 = minbrk
     70  1.2        pk 0:
     71  1.2        pk 	mov	%o0, %o2		! save argument to syscall
     72  1.2        pk 	mov	SYS_break, %g1
     73  1.2        pk 	t	ST_SYSCALL
     74  1.2        pk 	bcc,a	1f
     75  1.6    kleink 	ld	[%o5 + CURBRK], %o4
     76  1.2        pk 	ERROR()
     77  1.2        pk 1:
     78  1.2        pk 	retl				! success, return 0 & record new break
     79  1.2        pk 	 st	%o2, [%o4]
     80  1.2        pk #else
     81  1.1       cgd ENTRY(brk)
     82  1.5    kleink 	sethi	%hi(_C_LABEL(__minbrk)), %o1	! %o1 = minbrk
     83  1.5    kleink 	ld	[%o1 + %lo(_C_LABEL(__minbrk))], %o1
     84  1.1       cgd 	cmp	%o1, %o0		! if (minbrk > %o0)
     85  1.1       cgd 	bg,a	0f
     86  1.1       cgd 	 mov	%o1, %o0		!	%o0 = minbrk
     87  1.1       cgd 0:
     88  1.1       cgd 	mov	%o0, %o2		! save argument to syscall
     89  1.1       cgd 	mov	SYS_break, %g1
     90  1.1       cgd 	t	ST_SYSCALL
     91  1.1       cgd 	bcc,a	1f
     92  1.6    kleink 	 sethi	%hi(CURBRK), %g1
     93  1.1       cgd 	ERROR()
     94  1.1       cgd 1:
     95  1.1       cgd 	retl				! success, return 0 & record new break
     96  1.6    kleink 	 st	%o2, [%g1 + %lo(CURBRK)]
     97  1.2        pk #endif
     98