Home | History | Annotate | Line # | Download | only in sys
sbrk.S revision 1.6.8.1 
      1  1.6.8.1    kleink /*	$NetBSD: sbrk.S,v 1.6.8.1 2000/08/22 07:25:27 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: sbrk.s,v 1.3 92/07/02 00:56:49 torek 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 "@(#)sbrk.s	8.1 (Berkeley) 6/4/93"
     46      1.3  christos #else
     47  1.6.8.1    kleink 	RCSID("$NetBSD: sbrk.S,v 1.6.8.1 2000/08/22 07:25:27 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	_end
     54      1.5    kleink 	.globl	CURBRK
     55      1.1       cgd 
     56  1.6.8.1    kleink #ifdef WEAK_ALIAS
     57  1.6.8.1    kleink WEAK_ALIAS(sbrk, _sbrk)
     58  1.6.8.1    kleink #endif
     59  1.6.8.1    kleink 
     60      1.1       cgd 	.data
     61      1.6    kleink CURBRK:	.long	_end
     62      1.1       cgd 	.text
     63      1.1       cgd 
     64  1.6.8.1    kleink ENTRY(_sbrk)
     65      1.2        pk #ifdef PIC
     66      1.2        pk 	PIC_PROLOGUE(%o5,%o4)
     67      1.5    kleink 	ld	[%o5 + CURBRK], %o2
     68      1.2        pk 	ld	[%o2], %o3			! %o3 = old break
     69      1.2        pk 	add	%o3, %o0, %o4			! %o4 = new break
     70      1.2        pk 	mov	%o4, %o0			! copy for syscall
     71      1.2        pk 	mov	SYS_break, %g1
     72      1.2        pk 	t	ST_SYSCALL			! break(new_break)
     73      1.2        pk 	bcc,a	1f				! if success,
     74      1.2        pk 	 mov	%o3, %o0			!    set return value
     75      1.2        pk 	ERROR()
     76      1.2        pk 1:
     77      1.2        pk 	retl					! and update curbrk
     78      1.2        pk 	 st	%o4, [%o2]
     79      1.2        pk #else
     80      1.5    kleink 	sethi	%hi(CURBRK), %o2
     81      1.5    kleink 	ld	[%o2 + %lo(CURBRK)], %o3	! %o3 = old break
     82      1.1       cgd 	add	%o3, %o0, %o4			! %o4 = new break
     83      1.1       cgd 	mov	%o4, %o0			! copy for syscall
     84      1.1       cgd 	mov	SYS_break, %g1
     85      1.1       cgd 	t	ST_SYSCALL			! break(new_break)
     86      1.1       cgd 	bcc,a	1f				! if success,
     87      1.1       cgd 	 mov	%o3, %o0			!    set return value
     88      1.1       cgd 	ERROR()
     89      1.1       cgd 1:
     90      1.1       cgd 	retl					! and update curbrk
     91      1.5    kleink 	 st	%o4, [%o2 + %lo(CURBRK)]
     92      1.2        pk #endif
     93