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brk.S revision 1.5 
      1  1.1     glass /*-
      2  1.1     glass  * Copyright (c) 1991, 1993
      3  1.1     glass  *	The Regents of the University of California.  All rights reserved.
      4  1.1     glass  *
      5  1.1     glass  * This code is derived from software contributed to Berkeley by
      6  1.1     glass  * Ralph Campbell.
      7  1.1     glass  *
      8  1.1     glass  * Redistribution and use in source and binary forms, with or without
      9  1.1     glass  * modification, are permitted provided that the following conditions
     10  1.1     glass  * are met:
     11  1.1     glass  * 1. Redistributions of source code must retain the above copyright
     12  1.1     glass  *    notice, this list of conditions and the following disclaimer.
     13  1.1     glass  * 2. Redistributions in binary form must reproduce the above copyright
     14  1.1     glass  *    notice, this list of conditions and the following disclaimer in the
     15  1.1     glass  *    documentation and/or other materials provided with the distribution.
     16  1.1     glass  * 3. All advertising materials mentioning features or use of this software
     17  1.1     glass  *    must display the following acknowledgement:
     18  1.1     glass  *	This product includes software developed by the University of
     19  1.1     glass  *	California, Berkeley and its contributors.
     20  1.1     glass  * 4. Neither the name of the University nor the names of its contributors
     21  1.1     glass  *    may be used to endorse or promote products derived from this software
     22  1.1     glass  *    without specific prior written permission.
     23  1.1     glass  *
     24  1.1     glass  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  1.1     glass  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  1.1     glass  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  1.1     glass  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  1.1     glass  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  1.1     glass  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  1.1     glass  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  1.1     glass  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  1.1     glass  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  1.1     glass  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  1.1     glass  * SUCH DAMAGE.
     35  1.1     glass  */
     36  1.1     glass 
     37  1.5  jonathan #include "SYS.h"
     38  1.5  jonathan 
     39  1.1     glass #if defined(LIBC_SCCS) && !defined(lint)
     40  1.1     glass 	ASMSTR("from: @(#)brk.s	8.1 (Berkeley) 6/4/93")
     41  1.5  jonathan 	ASMSTR("$Id: brk.S,v 1.5 1995/09/25 19:21:41 jonathan Exp $")
     42  1.1     glass #endif /* LIBC_SCCS and not lint */
     43  1.4   mycroft 
     44  1.4   mycroft 	.globl	minbrk
     45  1.4   mycroft 	.globl	curbrk
     46  1.4   mycroft 
     47  1.4   mycroft 	.data
     48  1.4   mycroft minbrk:	.word	_C_LABEL(end)
     49  1.4   mycroft 	.text
     50  1.1     glass 
     51  1.3   mycroft LEAF(brk)
     52  1.1     glass 	lw	v0, minbrk
     53  1.3   mycroft 	bgeu	a0, v0, _C_LABEL(brk)
     54  1.1     glass 	move	a0, v0		# dont allow break < minbrk
     55  1.3   mycroft ALEAF(_brk)
     56  1.4   mycroft 	li	v0, SYS_break
     57  1.1     glass 	syscall
     58  1.1     glass 	bne	a3, zero, 1f
     59  1.1     glass 	sw	a0, curbrk
     60  1.1     glass 	move	v0, zero
     61  1.1     glass 	j	ra
     62  1.1     glass 1:
     63  1.3   mycroft 	j	_C_LABEL(cerror)
     64  1.3   mycroft END(brk)
     65