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/* $OpenBSD: brk.S,v 1.9 2013/01/05 11:20:55 miod Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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
.data
.align 8
ASGLOBAL(__minbrk)
.long _end
ENTRY(brk)
or.u %r5,%r0,%hi16(__minbrk)
ld %r5,%r5,%lo16(__minbrk)
cmp %r3,%r5,%r2
bb1 ls,%r3,1f /* r2 should be > minbrk; can't go below end */
or %r2,%r5,0 /* otherwise, set r2 to minbrk */
1:
or %r4,%r2,0
or %r13,%r0,__SYSCALLNAME(SYS_,break)
tb0 0,%r0,128
br __cerror
or.u %r5,%r0,%hi16(__curbrk)
st %r4,%r5,%lo16(__curbrk)
or %r2,%r0,0 /* clear r2/r3 to indicate success */
jmp.n %r1
or %r3,%r0,0
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