1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if defined(SYSLIBC_SCCS) && !defined(lint)
34	.asciz "@(#)brk.s	5.2 (Berkeley) 12/17/90"
35#endif /* SYSLIBC_SCCS and not lint */
36#include <machine/asm.h>
37__FBSDID("$FreeBSD$");
38
39#include "SYS.h"
40
41	.globl	HIDENAME(curbrk)
42	.globl	HIDENAME(minbrk)
43ENTRY(_brk)
44	pushq	%rdi
45	jmp	ok
46END(_brk)
47
48ENTRY(brk)
49	pushq	%rdi
50	movq	%rdi,%rax
51#ifdef PIC
52	movq	PIC_GOT(HIDENAME(minbrk)),%rdx
53	cmpq	%rax,(%rdx)
54#else
55	cmpq	%rax,HIDENAME(minbrk)(%rip)
56#endif
57	jbe	ok
58#ifdef PIC
59	movq	(%rdx),%rdi
60#else
61	movq	HIDENAME(minbrk)(%rip),%rdi
62#endif
63ok:
64	movq	$SYS_break,%rax
65	KERNCALL
66	jb	err
67	movq	0(%rsp),%rax
68#ifdef PIC
69	movq	PIC_GOT(HIDENAME(curbrk)),%rdx
70	movq	%rax,(%rdx)
71#else
72	movq	%rax,HIDENAME(curbrk)(%rip)
73#endif
74	movq	$0,%rax
75	popq	%rdi
76	ret
77err:
78	addq	$8, %rsp
79	jmp	HIDENAME(cerror)
80END(brk)
81
82	.section .note.GNU-stack,"",%progbits
83