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/* $OpenBSD: sbrk.S,v 1.9 2021/11/27 15:12:19 visa 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
.hidden __curbrk
.data
__curbrk: PTR_VAL _C_LABEL(_end)
.size __curbrk, . - __curbrk
.type __curbrk,@object
.text
FRAMESZ= MKFSIZ(1,1)
GPOFF= FRAMESZ-2*REGSZ
LEAF(sbrk, FRAMESZ)
PTR_SUBU sp, FRAMESZ
SETUP_GP64(GPOFF, sbrk)
.set reorder
PTR_L v1, __curbrk
li v0, SYS_break
PTR_ADDU a0, a0, v1 # compute current break
syscall
bne a3, zero, 1f
move v0, v1 # return old val of curbrk from above
PTR_S a0, __curbrk # save current val of curbrk from above
RESTORE_GP64
PTR_ADDU sp, FRAMESZ
j ra
1:
LA t9, CERROR
RESTORE_GP64
PTR_ADDU sp, FRAMESZ
jr t9
END(sbrk)
.weak sbrk
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