1/*	$OpenBSD: sbrk.S,v 1.13 2023/01/11 01:55:17 mortimer Exp $	*/
2/*	$NetBSD: sbrk.S,v 1.1 2001/06/19 00:25:06 fvdl Exp $	*/
3
4/*-
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * William Jolitz.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *	This product includes software developed by the University of
22 *	California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 *    may be used to endorse or promote products derived from this software
25 *    without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 *	from: @(#)sbrk.s	5.1 (Berkeley) 4/23/90
40 */
41
42#include <machine/asm.h>
43
44#include "SYS.h"
45
46	.globl	_end
47	.globl	__curbrk
48	.hidden	__curbrk
49
50	.data
51__curbrk:
52	.quad	_end
53	END(__curbrk)
54	.type	__curbrk,@object
55
56ENTRY_NB(sbrk)
57	RETGUARD_SETUP(sbrk, r11);
58	RETGUARD_PUSH(r11);
59	movq	__curbrk(%rip),%rax
60	movslq	%edi,%rsi
61	movq	%rsi,%rdi
62	addq	%rax,%rdi
63	SYSTRAP(break)
64	jc	1f
65	movq	__curbrk(%rip),%rax
66	addq	%rsi,__curbrk(%rip)
67	jmp	2f
681:
69	SET_ERRNO
702:
71	RETGUARD_POP(r11);
72	RETGUARD_CHECK(sbrk, r11);
73	ret
74END(sbrk)
75	.weak	sbrk
76