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sbrk.S revision 1.11 
      1 /*	$NetBSD: sbrk.S,v 1.11 2000/06/23 15:40:38 kleink Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Ralph Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include "SYS.h"
     40 
     41 #if defined(LIBC_SCCS) && !defined(lint)
     42 	ASMSTR("from: @(#)sbrk.s	8.1 (Berkeley) 6/4/93")
     43 	ASMSTR("$NetBSD: sbrk.S,v 1.11 2000/06/23 15:40:38 kleink Exp $")
     44 #endif /* LIBC_SCCS and not lint */
     45 
     46 #ifdef ABICALLS
     47 	.abicalls
     48 #endif
     49 
     50 	.globl	_C_LABEL(__curbrk)
     51 	.globl	_C_LABEL(_end)
     52 
     53 #ifdef WEAK_ALIAS
     54 WEAK_ALIAS(sbrk, _sbrk)
     55 #endif
     56 
     57 	.data
     58 _C_LABEL(__curbrk):
     59 	.word	_C_LABEL(_end)
     60 	.text
     61 
     62 #ifdef WEAK_ALIAS
     63 LEAF(_sbrk)
     64 #else
     65 LEAF(sbrk)
     66 #endif
     67 #ifdef ABICALLS
     68 	.set	noreorder
     69 	.cpload	t9
     70 	.set	reorder
     71 #endif
     72 	lw	v1, _C_LABEL(__curbrk)
     73 	li	v0, SYS_break
     74 	addu	a0, a0, v1		# compute current break
     75 	syscall
     76 	bne	a3, zero, 1f
     77 	move	v0, v1			# return old val of curbrk from above
     78 	sw	a0, _C_LABEL(__curbrk)	# save current val of curbrk from above
     79 	j	ra
     80 1:
     81 	la	t9, _C_LABEL(__cerror)
     82 	jr	t9
     83 END(sbrk)
     84