projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | |
| a7f8de16 | 45 | #define __HEAD_FLAG_BE 1 |
| a2c1d73b | 46 | #else |
| a7f8de16 | 47 | #define __HEAD_FLAG_BE 0 |
| a2c1d73b MR |
48 | #endif |
| 49 | ||
| a7f8de16 | 50 | #define __HEAD_FLAG_PAGE_SIZE ((PAGE_SHIFT - 10) / 2) |
| 9d372c9f | 51 | |
| a7f8de16 AB |
52 | #define __HEAD_FLAG_PHYS_BASE 1 |
| 53 | ||
| 54 | #define __HEAD_FLAGS ((__HEAD_FLAG_BE << 0) | \ | |
| 55 | (__HEAD_FLAG_PAGE_SIZE << 1) | \ | |
| 56 | (__HEAD_FLAG_PHYS_BASE << 3)) | |
| a2c1d73b MR |
57 | |
| 58 | /* | |
| 59 | * These will output as part of the Image header, which should be little-endian | |
| 60 | * regardless of the endianness of the kernel. While constant values could be | |
| 61 | * endian swapped in head.S, all are done here for consistency. | |
| 62 | */ | |
| 63 | #define HEAD_SYMBOLS \ | |
| 64 | _kernel_size_le = DATA_LE64(_end - _text); \ | |
| 65 | _kernel_offset_le = DATA_LE64(TEXT_OFFSET); \ | |
| 66 | _kernel_flags_le = DATA_LE64(__HEAD_FLAGS); | |
| 67 | ||
| e8f3010f AB |
68 | #ifdef CONFIG_EFI |
| 69 | ||
| 75feee3d AB |
70 | /* |
| 71 | * Prevent the symbol aliases below from being emitted into the kallsyms | |
| 72 | * table, by forcing them to be absolute symbols (which are conveniently | |
| 73 | * ignored by scripts/kallsyms) rather than section relative symbols. | |
| 74 | * The distinction is only relevant for partial linking, and only for symbols | |
| 75 | * that are defined within a section declaration (which is not the case for | |
| 76 | * the definitions below) so the resulting values will be identical. | |
| 77 | */ | |
| 78 | #define KALLSYMS_HIDE(sym) ABSOLUTE(sym) | |
| 79 | ||
| e8f3010f AB |
80 | /* |
| 81 | * The EFI stub has its own symbol namespace prefixed by __efistub_, to | |
| 82 | * isolate it from the kernel proper. The following symbols are legally | |
| 83 | * accessed by the stub, so provide some aliases to make them accessible. | |
| 84 | * Only include data symbols here, or text symbols of functions that are | |
| 85 | * guaranteed to be safe when executed at another offset than they were | |
| 86 | * linked at. The routines below are all implemented in assembler in a | |
| 87 | * position independent manner | |
| 88 | */ | |
| 75feee3d AB |
89 | __efistub_memcmp = KALLSYMS_HIDE(__pi_memcmp); |
| 90 | __efistub_memchr = KALLSYMS_HIDE(__pi_memchr); | |
| 91 | __efistub_memcpy = KALLSYMS_HIDE(__pi_memcpy); | |
| 92 | __efistub_memmove = KALLSYMS_HIDE(__pi_memmove); | |
| 93 | __efistub_memset = KALLSYMS_HIDE(__pi_memset); | |
| 94 | __efistub_strlen = KALLSYMS_HIDE(__pi_strlen); | |
| 95 | __efistub_strcmp = KALLSYMS_HIDE(__pi_strcmp); | |
| 96 | __efistub_strncmp = KALLSYMS_HIDE(__pi_strncmp); | |
| 97 | __efistub___flush_dcache_area = KALLSYMS_HIDE(__pi___flush_dcache_area); | |
| e8f3010f | 98 | |
| 39d114dd | 99 | #ifdef CONFIG_KASAN |
| 75feee3d AB |
100 | __efistub___memcpy = KALLSYMS_HIDE(__pi_memcpy); |
| 101 | __efistub___memmove = KALLSYMS_HIDE(__pi_memmove); | |
| 102 | __efistub___memset = KALLSYMS_HIDE(__pi_memset); | |
| 39d114dd AR |
103 | #endif |
| 104 | ||
| 75feee3d AB |
105 | __efistub__text = KALLSYMS_HIDE(_text); |
| 106 | __efistub__end = KALLSYMS_HIDE(_end); | |
| 107 | __efistub__edata = KALLSYMS_HIDE(_edata); | |
| e8f3010f AB |
108 | |
| 109 | #endif | |
| 110 | ||
| a2c1d73b | 111 | #endif /* __ASM_IMAGE_H */ |