mips/sys/sbrk.S

1.18   tsutsui /*	$NetBSD: sbrk.S,v 1.18 2010/12/12 09:03:06 tsutsui Exp $	*/
 1.7  jonathan
 1.1     glass /*-
 1.1     glass  * Copyright (c) 1991, 1993
 1.1     glass  *	The Regents of the University of California.  All rights reserved.
 1.1     glass  *
 1.1     glass  * This code is derived from software contributed to Berkeley by
 1.1     glass  * Ralph Campbell.
 1.1     glass  *
 1.1     glass  * Redistribution and use in source and binary forms, with or without
 1.1     glass  * modification, are permitted provided that the following conditions
 1.1     glass  * are met:
 1.1     glass  * 1. Redistributions of source code must retain the above copyright
 1.1     glass  *    notice, this list of conditions and the following disclaimer.
 1.1     glass  * 2. Redistributions in binary form must reproduce the above copyright
 1.1     glass  *    notice, this list of conditions and the following disclaimer in the
 1.1     glass  *    documentation and/or other materials provided with the distribution.
1.15       agc  * 3. Neither the name of the University nor the names of its contributors
 1.1     glass  *    may be used to endorse or promote products derived from this software
 1.1     glass  *    without specific prior written permission.
 1.1     glass  *
 1.1     glass  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 1.1     glass  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 1.1     glass  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 1.1     glass  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 1.1     glass  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 1.1     glass  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 1.1     glass  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 1.1     glass  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 1.1     glass  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 1.1     glass  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 1.1     glass  * SUCH DAMAGE.
 1.1     glass  */
 1.1     glass
 1.6  jonathan #include "SYS.h"
 1.6  jonathan
 1.1     glass #if defined(LIBC_SCCS) && !defined(lint)
1.17      matt #if 0
1.17      matt 	RCSID("from: @(#)sbrk.s	8.1 (Berkeley) 6/4/93")
1.17      matt #else
1.18   tsutsui 	RCSID("$NetBSD: sbrk.S,v 1.18 2010/12/12 09:03:06 tsutsui Exp $")
1.17      matt #endif
 1.1     glass #endif /* LIBC_SCCS and not lint */
 1.8  jonathan
 1.9    kleink 	.globl	_C_LABEL(__curbrk)
1.10    kleink 	.globl	_C_LABEL(_end)
 1.1     glass
1.11    kleink #ifdef WEAK_ALIAS
1.11    kleink WEAK_ALIAS(sbrk, _sbrk)
1.11    kleink #endif
1.11    kleink
 1.1     glass 	.data
 1.9    kleink _C_LABEL(__curbrk):
1.17      matt 	PTR_WORD	_C_LABEL(_end)
 1.1     glass 	.text
 1.1     glass
1.11    kleink LEAF(_sbrk)
1.17      matt 	PIC_PROLOGUE(_sbrk)
1.17      matt 	PTR_LA		t0, _C_LABEL(__curbrk)
1.17      matt 	PTR_L		v1, 0(t0)
1.17      matt 	PTR_ADDU	a0, a0, v1	# compute current break
1.17      matt 	SYSTRAP(break)
1.17      matt 	bne		a3, zero, 1f
1.17      matt 	move		v0, v1		# return old val of curbrk from above
1.18   tsutsui 	PTR_LA		t0, _C_LABEL(__curbrk)
1.17      matt 	PTR_S		a0, 0(t0)	# save current val of curbrk from above
1.17      matt 	PIC_RETURN()
 1.1     glass 1:
1.17      matt 	PIC_TAILCALL(__cerror)
1.16    simonb END(_sbrk)