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brk.S revision 1.10 
      1 /*	$NetBSD: brk.S,v 1.10 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: @(#)brk.s	8.1 (Berkeley) 6/4/93")
     43 	ASMSTR("$NetBSD: brk.S,v 1.10 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(__minbrk)
     51 	.globl	_C_LABEL(__curbrk)
     52 	.globl	_C_LABEL(_end)
     53 
     54 #ifdef WEAK_ALIAS
     55 WEAK_ALIAS(brk, _brk)
     56 #endif
     57 
     58 	.data
     59 _C_LABEL(__minbrk):
     60 	.word	_C_LABEL(_end)
     61 	.text
     62 
     63 #ifdef WEAK_ALIAS
     64 LEAF(_brk)
     65 #else
     66 LEAF(brk)
     67 #endif
     68 #ifdef ABICALLS
     69 	.set	noreorder
     70 	.cpload	t9
     71 	.set	reorder
     72 #endif
     73 	lw	v0, _C_LABEL(__minbrk)
     74 	bgeu	a0, v0, _C_LABEL(_brk)
     75 	move	a0, v0		# dont allow break < minbrk
     76 ALEAF(_brk)
     77 	li	v0, SYS_break
     78 	syscall
     79 	bne	a3, zero, 1f
     80 	sw	a0, _C_LABEL(__curbrk)
     81 	move	v0, zero
     82 	j	ra
     83 1:
     84 	la	t9, _C_LABEL(__cerror)
     85 	jr	t9
     86 END(brk)
     87