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sbrk.S revision 1.18.12.1 
      1  1.18.12.1       tls /*	$NetBSD: sbrk.S,v 1.18.12.1 2014/08/20 00:02:11 tls 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       1.15       agc  * 3. Neither the name of the University nor the names of its contributors
     19        1.1     glass  *    may be used to endorse or promote products derived from this software
     20        1.1     glass  *    without specific prior written permission.
     21        1.1     glass  *
     22        1.1     glass  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23        1.1     glass  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24        1.1     glass  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25        1.1     glass  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26        1.1     glass  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27        1.1     glass  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28        1.1     glass  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29        1.1     glass  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30        1.1     glass  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31        1.1     glass  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32        1.1     glass  * SUCH DAMAGE.
     33        1.1     glass  */
     34        1.1     glass 
     35        1.6  jonathan #include "SYS.h"
     36        1.6  jonathan 
     37        1.1     glass #if defined(LIBC_SCCS) && !defined(lint)
     38       1.17      matt #if 0
     39       1.17      matt 	RCSID("from: @(#)sbrk.s	8.1 (Berkeley) 6/4/93")
     40       1.17      matt #else
     41  1.18.12.1       tls 	RCSID("$NetBSD: sbrk.S,v 1.18.12.1 2014/08/20 00:02:11 tls Exp $")
     42       1.17      matt #endif
     43        1.1     glass #endif /* LIBC_SCCS and not lint */
     44        1.8  jonathan 
     45        1.9    kleink 	.globl	_C_LABEL(__curbrk)
     46       1.10    kleink 	.globl	_C_LABEL(_end)
     47        1.1     glass 
     48       1.11    kleink #ifdef WEAK_ALIAS
     49       1.11    kleink WEAK_ALIAS(sbrk, _sbrk)
     50       1.11    kleink #endif
     51       1.11    kleink 
     52        1.1     glass 	.data
     53        1.9    kleink _C_LABEL(__curbrk):
     54       1.17      matt 	PTR_WORD	_C_LABEL(_end)
     55        1.1     glass 	.text
     56        1.1     glass 
     57       1.11    kleink LEAF(_sbrk)
     58       1.17      matt 	PIC_PROLOGUE(_sbrk)
     59       1.17      matt 	PTR_LA		t0, _C_LABEL(__curbrk)
     60  1.18.12.1       tls 	PTR_L		t1, 0(t0)
     61  1.18.12.1       tls 	PTR_ADDU	a0, a0, t1	# compute current break
     62       1.17      matt 	SYSTRAP(break)
     63       1.17      matt 	bne		a3, zero, 1f
     64  1.18.12.1       tls 	move		v0, t1		# return old val of curbrk from above
     65       1.18   tsutsui 	PTR_LA		t0, _C_LABEL(__curbrk)
     66       1.17      matt 	PTR_S		a0, 0(t0)	# save current val of curbrk from above
     67       1.17      matt 	PIC_RETURN()
     68        1.1     glass 1:
     69       1.17      matt 	PIC_TAILCALL(__cerror)
     70       1.16    simonb END(_sbrk)
     71