mips/sys/sbrk.S

1.18.6.1      yamt /*	$NetBSD: sbrk.S,v 1.18.6.1 2014/05/22 11:36:48 yamt 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
1.18.6.1      yamt 	RCSID("$NetBSD: sbrk.S,v 1.18.6.1 2014/05/22 11:36:48 yamt 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)
1.18.6.1      yamt 	PTR_L		t1, 0(t0)
1.18.6.1      yamt 	PTR_ADDU	a0, a0, t1	# compute current break
    1.17      matt 	SYSTRAP(break)
    1.17      matt 	bne		a3, zero, 1f
1.18.6.1      yamt 	move		v0, t1		# 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)