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/* $OpenBSD: brk.S,v 1.15 2020/10/26 22:07:05 gkoehler Exp $ */
/*
* Copyright (c) 1996 Dale Rahn
*
* 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 AUTHOR ``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 AUTHOR 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"
.extern __curbrk
.extern _C_LABEL(_end)
.weak brk
ENTRY(brk)
/* check >= _end, if not make the call for _end */
#ifndef __PIC__
addis 5,0,_C_LABEL(_end)@h
ori 5,5,_C_LABEL(_end)@l /* # 5 = &_end */
#else
mflr 10
bcl 20, 31, 1f
1: mflr 9
addis 9, 9, _GLOBAL_OFFSET_TABLE_-1b@ha
addi 9, 9, _GLOBAL_OFFSET_TABLE_-1b@l
mtlr 10
lwz 5,_C_LABEL(_end)@got(9)
#endif
cmplw 3,5
bge+ .L_brk_call
mr 3, 5
.L_brk_call:
mr 7, 3
/* call break(size) */
#ifndef __PIC__
addis 6, 0, __curbrk@H
ori 6, 6, __curbrk@L /* # 6 = &__curbrk */
#else
lwz 6,__curbrk@got(9)
#endif
li 0, SYS_break
sc
/* check for error */
cmpwi 0, 0
beq+ .L_brk_ok /* OK so this is stupid but I haven't read b */
stw 0, R2_OFFSET_ERRNO(2)
li 3, -1
blr
/* update, __curbrk and return */
.L_brk_ok:
stw 7, 0(6) /* # remember, 6=&__curbrk, 3= new value */
mr 3, 0 /* # return 0 */
blr
END(brk)
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