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67 lines
2.0 KiB
67 lines
2.0 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Linker script macros to generate Image header fields. |
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* |
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* Copyright (C) 2014 ARM Ltd. |
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*/ |
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#ifndef __ARM64_KERNEL_IMAGE_H |
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#define __ARM64_KERNEL_IMAGE_H |
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#ifndef LINKER_SCRIPT |
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#error This file should only be included in vmlinux.lds.S |
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#endif |
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#include <asm/image.h> |
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/* |
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* There aren't any ELF relocations we can use to endian-swap values known only |
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* at link time (e.g. the subtraction of two symbol addresses), so we must get |
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* the linker to endian-swap certain values before emitting them. |
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* |
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* Note that, in order for this to work when building the ELF64 PIE executable |
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* (for KASLR), these values should not be referenced via R_AARCH64_ABS64 |
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* relocations, since these are fixed up at runtime rather than at build time |
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* when PIE is in effect. So we need to split them up in 32-bit high and low |
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* words. |
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*/ |
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#ifdef CONFIG_CPU_BIG_ENDIAN |
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#define DATA_LE32(data) \ |
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((((data) & 0x000000ff) << 24) | \ |
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(((data) & 0x0000ff00) << 8) | \ |
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(((data) & 0x00ff0000) >> 8) | \ |
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(((data) & 0xff000000) >> 24)) |
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#else |
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#define DATA_LE32(data) ((data) & 0xffffffff) |
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#endif |
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#define DEFINE_IMAGE_LE64(sym, data) \ |
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sym##_lo32 = DATA_LE32((data) & 0xffffffff); \ |
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sym##_hi32 = DATA_LE32((data) >> 32) |
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#define __HEAD_FLAG(field) (__HEAD_FLAG_##field << \ |
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ARM64_IMAGE_FLAG_##field##_SHIFT) |
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#ifdef CONFIG_CPU_BIG_ENDIAN |
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#define __HEAD_FLAG_BE ARM64_IMAGE_FLAG_BE |
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#else |
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#define __HEAD_FLAG_BE ARM64_IMAGE_FLAG_LE |
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#endif |
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#define __HEAD_FLAG_PAGE_SIZE ((PAGE_SHIFT - 10) / 2) |
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#define __HEAD_FLAG_PHYS_BASE 1 |
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#define __HEAD_FLAGS (__HEAD_FLAG(BE) | \ |
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__HEAD_FLAG(PAGE_SIZE) | \ |
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__HEAD_FLAG(PHYS_BASE)) |
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/* |
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* These will output as part of the Image header, which should be little-endian |
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* regardless of the endianness of the kernel. While constant values could be |
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* endian swapped in head.S, all are done here for consistency. |
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*/ |
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#define HEAD_SYMBOLS \ |
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DEFINE_IMAGE_LE64(_kernel_size_le, _end - _text); \ |
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DEFINE_IMAGE_LE64(_kernel_flags_le, __HEAD_FLAGS); |
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#endif /* __ARM64_KERNEL_IMAGE_H */
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