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/* $OpenBSD: brk.S,v 1.8 2016/05/30 05:18:52 guenther Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* 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
.data
__minbrk:
PTR_VAL _C_LABEL(_end)
.size __minbrk, . - __minbrk
.type __minbrk,@object
.text
FRAMESZ= MKFSIZ(1,1)
GPOFF= FRAMESZ-2*REGSZ
.weak brk
LEAF(brk, FRAMESZ)
PTR_SUBU sp, FRAMESZ
SETUP_GP64(GPOFF, brk)
.set reorder
PTR_L v0, __minbrk
bgtu a0, v0, 1f
move a0, v0 # dont allow break < minbrk
1:
li v0, SYS_break
syscall
bne a3, zero, 2f
PTR_S a0, __curbrk
move v0, zero
RESTORE_GP64
PTR_ADDU sp, FRAMESZ
j ra
2:
LA t9, CERROR
RESTORE_GP64
PTR_ADDU sp, FRAMESZ
jr t9
END(brk)
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