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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 | ||
9d372c9f AB |
50 | #define __HEAD_FLAG_PAGE_SIZE ((PAGE_SHIFT - 10) / 2) |
51 | ||
52 | #define __HEAD_FLAGS ((__HEAD_FLAG_BE << 0) | \ | |
53 | (__HEAD_FLAG_PAGE_SIZE << 1)) | |
a2c1d73b MR |
54 | |
55 | /* | |
56 | * These will output as part of the Image header, which should be little-endian | |
57 | * regardless of the endianness of the kernel. While constant values could be | |
58 | * endian swapped in head.S, all are done here for consistency. | |
59 | */ | |
60 | #define HEAD_SYMBOLS \ | |
61 | _kernel_size_le = DATA_LE64(_end - _text); \ | |
62 | _kernel_offset_le = DATA_LE64(TEXT_OFFSET); \ | |
63 | _kernel_flags_le = DATA_LE64(__HEAD_FLAGS); | |
64 | ||
e8f3010f AB |
65 | #ifdef CONFIG_EFI |
66 | ||
67 | /* | |
68 | * The EFI stub has its own symbol namespace prefixed by __efistub_, to | |
69 | * isolate it from the kernel proper. The following symbols are legally | |
70 | * accessed by the stub, so provide some aliases to make them accessible. | |
71 | * Only include data symbols here, or text symbols of functions that are | |
72 | * guaranteed to be safe when executed at another offset than they were | |
73 | * linked at. The routines below are all implemented in assembler in a | |
74 | * position independent manner | |
75 | */ | |
76 | __efistub_memcmp = __pi_memcmp; | |
77 | __efistub_memchr = __pi_memchr; | |
78 | __efistub_memcpy = __pi_memcpy; | |
79 | __efistub_memmove = __pi_memmove; | |
80 | __efistub_memset = __pi_memset; | |
81 | __efistub_strlen = __pi_strlen; | |
82 | __efistub_strcmp = __pi_strcmp; | |
83 | __efistub_strncmp = __pi_strncmp; | |
84 | __efistub___flush_dcache_area = __pi___flush_dcache_area; | |
85 | ||
39d114dd AR |
86 | #ifdef CONFIG_KASAN |
87 | __efistub___memcpy = __pi_memcpy; | |
88 | __efistub___memmove = __pi_memmove; | |
89 | __efistub___memset = __pi_memset; | |
90 | #endif | |
91 | ||
e8f3010f AB |
92 | __efistub__text = _text; |
93 | __efistub__end = _end; | |
94 | __efistub__edata = _edata; | |
95 | ||
96 | #endif | |
97 | ||
a2c1d73b | 98 | #endif /* __ASM_IMAGE_H */ |