1/*
2 * Linker script macros to generate Image header fields.
3 *
4 * Copyright (C) 2014 ARM Ltd.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
17 */
18#ifndef __ASM_IMAGE_H
19#define __ASM_IMAGE_H
20
21#ifndef LINKER_SCRIPT
22#error This file should only be included in vmlinux.lds.S
23#endif
24
25/*
26 * There aren't any ELF relocations we can use to endian-swap values known only
27 * at link time (e.g. the subtraction of two symbol addresses), so we must get
28 * the linker to endian-swap certain values before emitting them.
29 */
30#ifdef CONFIG_CPU_BIG_ENDIAN
31#define DATA_LE64(data)					\
32	((((data) & 0x00000000000000ff) << 56) |	\
33	 (((data) & 0x000000000000ff00) << 40) |	\
34	 (((data) & 0x0000000000ff0000) << 24) |	\
35	 (((data) & 0x00000000ff000000) << 8)  |	\
36	 (((data) & 0x000000ff00000000) >> 8)  |	\
37	 (((data) & 0x0000ff0000000000) >> 24) |	\
38	 (((data) & 0x00ff000000000000) >> 40) |	\
39	 (((data) & 0xff00000000000000) >> 56))
40#else
41#define DATA_LE64(data) ((data) & 0xffffffffffffffff)
42#endif
43
44#ifdef CONFIG_CPU_BIG_ENDIAN
45#define __HEAD_FLAG_BE	1
46#else
47#define __HEAD_FLAG_BE	0
48#endif
49
50#define __HEAD_FLAGS	(__HEAD_FLAG_BE << 0)
51
52/*
53 * These will output as part of the Image header, which should be little-endian
54 * regardless of the endianness of the kernel. While constant values could be
55 * endian swapped in head.S, all are done here for consistency.
56 */
57#define HEAD_SYMBOLS						\
58	_kernel_size_le		= DATA_LE64(_end - _text);	\
59	_kernel_offset_le	= DATA_LE64(TEXT_OFFSET);	\
60	_kernel_flags_le	= DATA_LE64(__HEAD_FLAGS);
61
62#endif /* __ASM_IMAGE_H */
63