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a2c1d73b MR |
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 */ |