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