1/*        $NetBSD: sbrk.S,v 1.8 2020/05/10 14:34:31 skrll Exp $       */
2
3/*        $OpenBSD: sbrk.S,v 1.7 2001/06/04 23:14:04 mickey Exp $     */
4
5/*
6 * Copyright (c) 1999 Michael Shalayeff
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
27 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28 * THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "SYS.h"
32
33#if defined(LIBC_SCCS) && !defined(lint)
34          RCSID("$NetBSD: sbrk.S,v 1.8 2020/05/10 14:34:31 skrll Exp $")
35#endif /* LIBC_SCCS and not lint */
36
37          .global   _end
38
39#ifdef WEAK_ALIAS
40          WEAK_ALIAS(sbrk, _sbrk)
41#endif
42
43          .data
44          .export   __curbrk, data
45          .hidden __curbrk
46__curbrk:
47          .long     _end
48
49ENTRY(_sbrk,0)
50#ifdef __PIC__
51          addil     LT%__curbrk, %r19
52          ldw       RT%__curbrk(%r1), %r1
53          ldw       0(%r1), %t2
54#else  /* !__PIC__ */
55          ldil      L%__curbrk, %t1
56          ldw       R%__curbrk(%t1), %t2
57#endif /* !__PIC__ */
58          add       %arg0, %t2, %arg0
59          stw       %arg0, HPPA_FRAME_ARG(0)(%sp)
60
61          SYSCALL(break)
62
63#ifdef __PIC__
64          addil     LT%__curbrk, %r19
65          ldw       RT%__curbrk(%r1), %r1
66#else  /* !__PIC__ */
67          ldil      L%__curbrk, %t1
68          ldo       R%__curbrk(%t1), %r1
69#endif /* !__PIC__ */
70          ldw       0(%r1), %ret0
71          ldw       HPPA_FRAME_ARG(0)(%sp), %arg0
72          bv        %r0(%rp)
73           stw      %arg0, 0(%r1)
74
75EXIT(sbrk)
76
77          .end
78