/* 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 */