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/* $OpenBSD: brk.S,v 1.4 2020/10/16 23:42:16 deraadt 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
SYSENTRY(brk)
RETGUARD_SETUP(brk, %r11)
/* check >= _end, if not make the call for _end */
addis %r5, %r2, .LC0@toc@ha
ld %r5, .LC0@toc@l(%r5) /* # %r5 = &_end */
cmpld %r3, %r5
bge+ .L_brk_call
mr %r3, %r5
.L_brk_call:
mr %r7, %r3
/* call break(size) */
addis %r6, %r2, __curbrk@toc@ha
addi %r6, %r6, __curbrk@toc@l /* # %r6 = &__curbrk */
li %r0, SYS_break
sc
/* check for error */
cmpwi %r0, 0
beq+ .L_brk_ok /* OK so this is stupid but I haven't read b */
stw %r0, R13_OFFSET_ERRNO(%r13)
li %r3, -1
b .L_done
nop
/* update, __curbrk and return */
.L_brk_ok:
std %r7, 0(%r6) /* # remember, %r6=&__curbrk, %r3=new value */
mr %r3, 0 /* # return 0 */
.L_done:
RETGUARD_CHECK(brk, %r11);
blr
END(brk)
.section .toc,"aw",@progbits
.LC0:
.tc _end[TC],_end
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