1/*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright © 2020 Keith Packard
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above
14 *    copyright notice, this list of conditions and the following
15 *    disclaimer in the documentation and/or other materials provided
16 *    with the distribution.
17 *
18 * 3. Neither the name of the copyright holder nor the names of its
19 *    contributors may be used to endorse or promote products derived
20 *    from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
33 * OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35#include "arm_tls.h"
36/*
37 * This cannot be a C ABI function as the compiler assumes that it
38 * does not modify anything other than r0 and lr.
39 */
40	.syntax unified
41	.text
42	.align 4
43	.p2align 4,,15
44	.global __aeabi_read_tp
45	.type __aeabi_read_tp,%function
46#ifdef __thumb__
47	.thumb
48#endif
49
50__aeabi_read_tp:
51	.cfi_sections .debug_frame
52	.cfi_startproc
53#ifdef ARM_TLS_CP15
54	mrc p15, 0, r0, c13, c0, 3
55#else
56	/* Load the address of __tls */
57	ldr r0,1f
58	/* Dereference to get the value of __tls */
59	ldr r0,[r0]
60#endif
61	/* All done, return to caller */
62	bx lr
63	.cfi_endproc
64
65	/* Holds the address of __tls */
66	.align 2
67#ifndef ARM_TLS_CP15
681: .word __tls
69#endif
70