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/* $OpenBSD: sbrk.S,v 1.9 2015/09/10 13:29:09 guenther 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.
*/
#include "SYS.h"
.globl _end
.globl __curbrk
.hidden __curbrk
.data
__curbrk: .long _end
END(__curbrk)
.type __curbrk,@object
.text
.weak sbrk
ENTRY(sbrk)
#ifdef __PIC__
PIC_PROLOGUE(%o5,%o4)
#if __PIC__ == 1
ld [%o5 + __curbrk], %o2
#else /* __PIC__ == 2 */
sethi %hi(__curbrk), %o2
or %o2, %lo(__curbrk), %o2
ld [%o5 + %o2], %o2
#endif
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
END(sbrk)
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