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/* $OpenBSD: sbrk.S,v 1.9 2023/01/13 17:52:08 miod Exp $ */
/* $NetBSD: sbrk.S,v 1.7 2000/07/25 15:14:46 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
.hidden __curbrk
.globl _end
.data
.align 8
__curbrk:
.xword _end
END(__curbrk)
OTYPE(__curbrk)
.text
ENTRY_NB(sbrk)
#ifdef __PIC__
PIC_PROLOGUE(%o5, %o4)
set __curbrk, %o3
ldx [%o5 + %o3], %o2
ldx [%o2], %o3 /* %o3 = old break */
add %o3, %o0, %o4 /* %o4 = new break */
mov %o4, %o0 /* copy for syscall */
mov SYS_break, %g1
t ST_SYSCALL /* break(new_break) */
bcc,a 1f /* if success, */
mov %o3, %o0 /* set return value */
ERROR()
1:
retl /* and update curbrk */
stx %o4, [%o2]
#else
sethi %hi(__curbrk), %o2
ldx [%o2 + %lo(__curbrk)], %o3 /* %o3 = old break */
add %o3, %o0, %o4 /* %o4 = new break */
mov %o4, %o0 /* copy for syscall */
mov SYS_break, %g1
t ST_SYSCALL /* break(new_break) */
bcc,a 1f /* if success, */
mov %o3, %o0 /* set return value */
ERROR()
1:
retl /* and update curbrk */
stx %o4, [%o2 + %lo(__curbrk)]
#endif
END(sbrk)
.weak sbrk
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