minix/lib/nbsd_libc/arch/sparc/sys/sbrk.S

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/* $NetBSD: sbrk.S,v 1.10 2007/10/08 13:06:00 uwe Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Header: sbrk.s,v 1.3 92/07/02 00:56:49 torek Exp
*/
#include <machine/asm.h>
#if defined(SYSLIBC_SCCS) && !defined(lint)
#if 0
.asciz "@(#)sbrk.s 8.1 (Berkeley) 6/4/93"
#else
RCSID("$NetBSD: sbrk.S,v 1.10 2007/10/08 13:06:00 uwe Exp $")
#endif
#endif /* SYSLIBC_SCCS and not lint */
#include "SYS.h"
.globl _end
.globl CURBRK
#ifdef WEAK_ALIAS
WEAK_ALIAS(sbrk, _sbrk)
#endif
.data
CURBRK: .long _end
.text
ENTRY(_sbrk)
#ifdef PIC
PIC_PROLOGUE(%o5,%o4)
set CURBRK, %o2
ld [%o5 + %o2], %o2
ld [%o2], %o3 ! %o3 = old break
add %o3, %o0, %o4 ! %o4 = new break
mov %o4, %o0 ! copy for syscall
mov SYS_break, %g1
t ST_SYSCALL ! break(new_break)
bcc,a 1f ! if success,
mov %o3, %o0 ! set return value
ERROR()
1:
retl ! and update curbrk
st %o4, [%o2]
#else
sethi %hi(CURBRK), %o2
ld [%o2 + %lo(CURBRK)], %o3 ! %o3 = old break
add %o3, %o0, %o4 ! %o4 = new break
mov %o4, %o0 ! copy for syscall
mov SYS_break, %g1
t ST_SYSCALL ! break(new_break)
bcc,a 1f ! if success,
mov %o3, %o0 ! set return value
ERROR()
1:
retl ! and update curbrk
st %o4, [%o2 + %lo(CURBRK)]
#endif