sbrk.S revision 1.6 
1/*	$OpenBSD: sbrk.S,v 1.6 2015/08/26 01:54:09 guenther 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
50WEAK_ALIAS(sbrk, _sbrk)
51
52	.data
53__curbrk:	.quad	_end
54	.text
55
56ENTRY(_sbrk)
57#ifdef __PIC__
58	movq	PIC_GOT(__curbrk),%rdx
59	movslq  %edi, %rax
60	movq	(%rdx),%rdi
61	addq	%rax,%rdi
62	SYSTRAP(break)
63	jc	err
64	movq	PIC_GOT(__curbrk),%rdx
65	movq	(%rdx),%rax
66	movq	%rdi,(%rdx)
67	ret
68err:
69	mov	PIC_GOT(CERROR),%rdx
70	jmp	*%rdx
71#else
72	movq	__curbrk(%rip),%rax
73	movslq	%edi,%rsi
74	movq	%rsi,%rdi
75	addq	%rax,%rdi
76	SYSTRAP(break)
77	jc	err
78	movq	__curbrk(%rip),%rax
79	addq	%rsi,__curbrk(%rip)
80	ret
81err:
82	jmp	CERROR
83#endif
84END(_sbrk)
85