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/* $OpenBSD: brk.S,v 1.7 2012/08/22 17:19:35 pascal 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 __curbrk
.globl minbrk
.data
minbrk: .long _end ! lower brk limit; also for gmon code
.text
#ifdef __PIC__
ENTRY(brk)
PIC_PROLOGUE(%o5,%o4)
ld [%o5 + minbrk], %o4
ld [%o4], %o1 ! %o1 = minbrk
cmp %o1, %o0 ! if (minbrk > %o0)
bgu,a 0f
mov %o1, %o0 ! %o0 = minbrk
0:
mov %o0, %o2 ! save argument to syscall
mov SYS_break, %g1
t ST_SYSCALL
bcc,a 1f
ld [%o5 + __curbrk], %o4
ERROR()
1:
retl ! success, return 0 & record new break
st %o2, [%o4]
#else
ENTRY(brk)
sethi %hi(minbrk), %o1 ! %o1 = minbrk
ld [%o1 + %lo(minbrk)], %o1
cmp %o1, %o0 ! if (minbrk > %o0)
bgu,a 0f
mov %o1, %o0 ! %o0 = minbrk
0:
mov %o0, %o2 ! save argument to syscall
mov SYS_break, %g1
t ST_SYSCALL
bcc,a 1f
sethi %hi(__curbrk), %g1
ERROR()
1:
retl ! success, return 0 & record new break
st %o2, [%g1 + %lo(__curbrk)]
#endif
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