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/* $OpenBSD: sbrk.S,v 1.3 2017/11/22 20:36:02 kettenis Exp $ */
/* $NetBSD: sbrk.S,v 1.7 2003/08/07 16:42:05 agc Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* 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.
*
* from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90
*/
#include "SYS.h"
.globl _C_LABEL(_end)
.data
.align 3
.globl __curbrk
.type __curbrk,#object
.hidden __curbrk
__curbrk:
.quad _C_LABEL(_end)
END(__curbrk)
/*
* Change the data segment size
*/
ENTRY(sbrk)
#ifdef __PIC__
/* Setup the GOT */
adrp x3, :got:__curbrk
ldr x2, [x3, #:got_lo12:__curbrk]
#else
ldr x2, .Lcurbrk
#endif
/* Get the current brk address */
ldr x1, [x2]
/* Calculate new value */
mov x3, x0
add x0, x0, x1
SYSTRAP(break)
bcs CERROR
/* Store new curbrk value */
ldr x0, [x2]
add x1, x0, x3
str x1, [x2]
/* Return old curbrk value */
ret
.align 3
#if !defined(__PIC__)
.Lcurbrk:
.quad __curbrk
#endif
END(sbrk)
.weak sbrk
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