ptrace.S revision 1.13 
1/*	$NetBSD: ptrace.S,v 1.13 2025/05/03 19:57:13 riastradh Exp $ */
2
3/*-
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 *	from: @(#)ptrace.s	5.1 (Berkeley) 4/23/90
32 */
33
34#include "SYS.h"
35
36ENTRY(ptrace)
37#ifdef _REENTRANT
38#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
39	push	{r0-r3, lr}
40#else
41	push	{r0-r4}
42	mov	r4, lr
43#endif
44	sub	sp, sp, #4	/* align stack */
45	bl	PLT_SYM(_C_LABEL(__errno))
46	add	sp, sp, #4	/* unalign stack */
47	movs	r1, #0
48	str	r1, [r0]
49#if !defined(__thumb__) || defined(_ARM_ARCH_T2)
50	pop	{r0-r3, lr}
51#else
52	mov	lr, r4
53	pop	{r0-r4}
54#endif
55#else
56	push	{r0, r1}
57	GOT_INIT(r0, .Lgot, .LPIC0)
58	GOT_GET(r0, r1, .Lerrno)
59	movs	r0, #0
60	str	r0, [r1]
61	pop	{r0, r1}
62#endif /* _REENTRANT */
63
64	SYSTRAP(ptrace)
65	_INVOKE_CERROR()
66	RET
67
68#ifndef _REENTRANT
69	GOT_INITSYM(.Lgot, .LPIC0)
70
71.Lerrno:
72	.word	GOT_SYM(_C_LABEL(errno))
73#endif /* !_REENTRANT */
74END(ptrace)
75