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sbrk.S revision 1.10.10.1 
      1  1.10.10.1    kleink /*	$NetBSD: sbrk.S,v 1.10.10.1 2000/08/22 07:13:30 kleink Exp $	*/
      2        1.7  jonathan 
      3        1.1     glass /*-
      4        1.1     glass  * Copyright (c) 1991, 1993
      5        1.1     glass  *	The Regents of the University of California.  All rights reserved.
      6        1.1     glass  *
      7        1.1     glass  * This code is derived from software contributed to Berkeley by
      8        1.1     glass  * Ralph Campbell.
      9        1.1     glass  *
     10        1.1     glass  * Redistribution and use in source and binary forms, with or without
     11        1.1     glass  * modification, are permitted provided that the following conditions
     12        1.1     glass  * are met:
     13        1.1     glass  * 1. Redistributions of source code must retain the above copyright
     14        1.1     glass  *    notice, this list of conditions and the following disclaimer.
     15        1.1     glass  * 2. Redistributions in binary form must reproduce the above copyright
     16        1.1     glass  *    notice, this list of conditions and the following disclaimer in the
     17        1.1     glass  *    documentation and/or other materials provided with the distribution.
     18        1.1     glass  * 3. All advertising materials mentioning features or use of this software
     19        1.1     glass  *    must display the following acknowledgement:
     20        1.1     glass  *	This product includes software developed by the University of
     21        1.1     glass  *	California, Berkeley and its contributors.
     22        1.1     glass  * 4. Neither the name of the University nor the names of its contributors
     23        1.1     glass  *    may be used to endorse or promote products derived from this software
     24        1.1     glass  *    without specific prior written permission.
     25        1.1     glass  *
     26        1.1     glass  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27        1.1     glass  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28        1.1     glass  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29        1.1     glass  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30        1.1     glass  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31        1.1     glass  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32        1.1     glass  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33        1.1     glass  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34        1.1     glass  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35        1.1     glass  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36        1.1     glass  * SUCH DAMAGE.
     37        1.1     glass  */
     38        1.1     glass 
     39        1.6  jonathan #include "SYS.h"
     40        1.6  jonathan 
     41        1.1     glass #if defined(LIBC_SCCS) && !defined(lint)
     42        1.1     glass 	ASMSTR("from: @(#)sbrk.s	8.1 (Berkeley) 6/4/93")
     43  1.10.10.1    kleink 	ASMSTR("$NetBSD: sbrk.S,v 1.10.10.1 2000/08/22 07:13:30 kleink Exp $")
     44        1.1     glass #endif /* LIBC_SCCS and not lint */
     45        1.5   mycroft 
     46        1.8  jonathan #ifdef ABICALLS
     47        1.8  jonathan 	.abicalls
     48        1.8  jonathan #endif
     49        1.8  jonathan 
     50        1.9    kleink 	.globl	_C_LABEL(__curbrk)
     51       1.10    kleink 	.globl	_C_LABEL(_end)
     52        1.1     glass 
     53  1.10.10.1    kleink #ifdef WEAK_ALIAS
     54  1.10.10.1    kleink WEAK_ALIAS(sbrk, _sbrk)
     55  1.10.10.1    kleink #endif
     56  1.10.10.1    kleink 
     57        1.1     glass 	.data
     58        1.9    kleink _C_LABEL(__curbrk):
     59       1.10    kleink 	.word	_C_LABEL(_end)
     60        1.1     glass 	.text
     61        1.1     glass 
     62  1.10.10.1    kleink LEAF(_sbrk)
     63        1.8  jonathan #ifdef ABICALLS
     64        1.8  jonathan 	.set	noreorder
     65        1.8  jonathan 	.cpload	t9
     66        1.8  jonathan 	.set	reorder
     67        1.8  jonathan #endif
     68        1.9    kleink 	lw	v1, _C_LABEL(__curbrk)
     69        1.5   mycroft 	li	v0, SYS_break
     70        1.9    kleink 	addu	a0, a0, v1		# compute current break
     71        1.1     glass 	syscall
     72        1.1     glass 	bne	a3, zero, 1f
     73        1.9    kleink 	move	v0, v1			# return old val of curbrk from above
     74        1.9    kleink 	sw	a0, _C_LABEL(__curbrk)	# save current val of curbrk from above
     75        1.1     glass 	j	ra
     76        1.1     glass 1:
     77        1.9    kleink 	la	t9, _C_LABEL(__cerror)
     78        1.8  jonathan 	jr	t9
     79        1.4   mycroft END(sbrk)
     80