| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* |
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| 3 | * Linker script macros to generate Image header fields. |
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| 4 | * |
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| 5 | * Copyright (C) 2014 ARM Ltd. |
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| 6 | */ |
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| 7 | #ifndef __ARM64_KERNEL_IMAGE_H |
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| 8 | #define __ARM64_KERNEL_IMAGE_H |
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| 9 | |
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| 10 | #ifndef LINKER_SCRIPT |
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| 11 | #error This file should only be included in vmlinux.lds.S |
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| 12 | #endif |
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| 13 | |
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| 14 | #include <asm/image.h> |
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| 15 | |
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| 16 | /* |
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| 17 | * There aren't any ELF relocations we can use to endian-swap values known only |
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| 18 | * at link time (e.g. the subtraction of two symbol addresses), so we must get |
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| 19 | * the linker to endian-swap certain values before emitting them. |
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| 20 | * |
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| 21 | * Note that, in order for this to work when building the ELF64 PIE executable |
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| 22 | * (for KASLR), these values should not be referenced via R_AARCH64_ABS64 |
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| 23 | * relocations, since these are fixed up at runtime rather than at build time |
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| 24 | * when PIE is in effect. So we need to split them up in 32-bit high and low |
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| 25 | * words. |
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| 26 | */ |
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| 27 | #ifdef CONFIG_CPU_BIG_ENDIAN |
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| 28 | #define DATA_LE32(data) \ |
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| 29 | ((((data) & 0x000000ff) << 24) | \ |
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| 30 | (((data) & 0x0000ff00) << 8) | \ |
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| 31 | (((data) & 0x00ff0000) >> 8) | \ |
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| 32 | (((data) & 0xff000000) >> 24)) |
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| 33 | #else |
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| 34 | #define DATA_LE32(data) ((data) & 0xffffffff) |
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| 35 | #endif |
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| 36 | |
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| 37 | #define DEFINE_IMAGE_LE64(sym, data) \ |
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| 38 | sym##_lo32 = DATA_LE32((data) & 0xffffffff); \ |
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| 39 | sym##_hi32 = DATA_LE32((data) >> 32) |
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| 40 | |
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| 41 | #define __HEAD_FLAG(field) (__HEAD_FLAG_##field << \ |
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| 42 | ARM64_IMAGE_FLAG_##field##_SHIFT) |
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| 43 | |
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| 44 | #ifdef CONFIG_CPU_BIG_ENDIAN |
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| 45 | #define __HEAD_FLAG_BE ARM64_IMAGE_FLAG_BE |
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| 46 | #else |
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| 47 | #define __HEAD_FLAG_BE ARM64_IMAGE_FLAG_LE |
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| 48 | #endif |
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| 49 | |
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| 50 | #define __HEAD_FLAG_PAGE_SIZE ((PAGE_SHIFT - 10) / 2) |
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| 51 | |
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| 52 | #define __HEAD_FLAG_PHYS_BASE 1 |
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| 53 | |
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| 54 | #define __HEAD_FLAGS (__HEAD_FLAG(BE) | \ |
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| 55 | __HEAD_FLAG(PAGE_SIZE) | \ |
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| 56 | __HEAD_FLAG(PHYS_BASE)) |
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| 57 | |
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| 58 | /* |
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| 59 | * These will output as part of the Image header, which should be little-endian |
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| 60 | * regardless of the endianness of the kernel. While constant values could be |
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| 61 | * endian swapped in head.S, all are done here for consistency. |
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| 62 | */ |
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| 63 | #define HEAD_SYMBOLS \ |
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| 64 | DEFINE_IMAGE_LE64(_kernel_size_le, _end - _text); \ |
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| 65 | DEFINE_IMAGE_LE64(_kernel_flags_le, __HEAD_FLAGS); |
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| 66 | |
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| 67 | #endif /* __ARM64_KERNEL_IMAGE_H */ |
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| 68 | |
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