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/* $OpenBSD: brk.S,v 1.11 2023/01/13 17:52:08 miod Exp $ */
/* $NetBSD: brk.S,v 1.9 2000/07/25 20:15:40 mycroft Exp $ */
/*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* 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 <machine/asm.h>
#include "SYS.h"
.globl __curbrk
.globl _end
.data
.align 8
__minbrk:
.xword _end /* lower brk limit; also for gmon code */
END(__minbrk)
OTYPE(__minbrk)
.text
ENTRY_NB(brk)
#ifdef __PIC__
PIC_PROLOGUE(%o5, %o4)
set __minbrk, %o4
ldx [%o5 + %o4], %o4
ldx [%o4], %o1 /* %o1 = minbrk */
cmp %o1, %o0 /* if (minbrk > %o0) */
movgu %xcc, %o1, %o0 /* %o0 = minbrk */
mov %o0, %o2 /* save argument to syscall */
mov SYS_break, %g1
t ST_SYSCALL
set __curbrk, %o3
bcc,a,pt %icc, 1f
ldx [%o5 + %o3], %o4
ERROR()
1:
retl /* success, return 0 & record new break */
stx %o2, [%o4]
#else
sethi %hi(__minbrk), %o1 /* %o1 = minbrk */
ldx [%o1 + %lo(__minbrk)], %o1
cmp %o1, %o0 /* if (minbrk > %o0) */
movgu %xcc, %o1, %o0 /* %o0 = minbrk */
mov %o0, %o2 /* save argument to syscall */
mov SYS_break, %g1
t ST_SYSCALL
bcc,a,pt %icc,1f
sethi %hi(__curbrk), %g1
ERROR()
1:
retl /* success, return 0 & record new break */
stx %o2, [%g1 + %lo(__curbrk)]
#endif
END(brk)
.weak brk
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