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/* $NetBSD: brk.S,v 1.4 2015/03/31 11:59:41 matt Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matt Thomas of 3am Software Foundry.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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"
#if defined(LIBC_SCCS) && !defined(lint)
RCSID("$NetBSD: brk.S,v 1.4 2015/03/31 11:59:41 matt Exp $")
#endif /* LIBC_SCCS and not lint */
.hidden _C_LABEL(__minbrk)
.hidden _C_LABEL(__curbrk)
.globl _C_LABEL(__minbrk)
.globl _C_LABEL(__curbrk)
.globl _C_LABEL(_end)
#ifdef WEAK_ALIAS
WEAK_ALIAS(brk, _brk)
#endif
.data
.p2align PTR_SCALESHIFT
_C_LABEL(__minbrk):
PTR_WORD _C_LABEL(_end)
_C_LABEL(__curbrk):
PTR_WORD _C_LABEL(_end)
.text
ENTRY(_brk)
lla t1, _C_LABEL(__minbrk)
PTR_L t5, 0(t1)
bgeu a0, t5, 1f
move a0, t5 # dont allow break < minbrk
1:
SYSTRAP(break)
JUMP_TO_CERROR() /* error */
PTR_S a0, __SIZEOF_POINTER__(t1) /* success */
move a0, zero
ret
END(_brk)
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