1*caab277bSThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-only */ 2a2c1d73bSMark Rutland /* 3a2c1d73bSMark Rutland * Linker script macros to generate Image header fields. 4a2c1d73bSMark Rutland * 5a2c1d73bSMark Rutland * Copyright (C) 2014 ARM Ltd. 6a2c1d73bSMark Rutland */ 7f56063c5SAKASHI Takahiro #ifndef __ARM64_KERNEL_IMAGE_H 8f56063c5SAKASHI Takahiro #define __ARM64_KERNEL_IMAGE_H 9a2c1d73bSMark Rutland 10a2c1d73bSMark Rutland #ifndef LINKER_SCRIPT 11a2c1d73bSMark Rutland #error This file should only be included in vmlinux.lds.S 12a2c1d73bSMark Rutland #endif 13a2c1d73bSMark Rutland 14f56063c5SAKASHI Takahiro #include <asm/image.h> 15f56063c5SAKASHI Takahiro 16a2c1d73bSMark Rutland /* 17a2c1d73bSMark Rutland * There aren't any ELF relocations we can use to endian-swap values known only 18a2c1d73bSMark Rutland * at link time (e.g. the subtraction of two symbol addresses), so we must get 19a2c1d73bSMark Rutland * the linker to endian-swap certain values before emitting them. 206ad1fe5dSArd Biesheuvel * 216ad1fe5dSArd Biesheuvel * Note that, in order for this to work when building the ELF64 PIE executable 226ad1fe5dSArd Biesheuvel * (for KASLR), these values should not be referenced via R_AARCH64_ABS64 236ad1fe5dSArd Biesheuvel * relocations, since these are fixed up at runtime rather than at build time 246ad1fe5dSArd Biesheuvel * when PIE is in effect. So we need to split them up in 32-bit high and low 256ad1fe5dSArd Biesheuvel * words. 26a2c1d73bSMark Rutland */ 27a2c1d73bSMark Rutland #ifdef CONFIG_CPU_BIG_ENDIAN 286ad1fe5dSArd Biesheuvel #define DATA_LE32(data) \ 296ad1fe5dSArd Biesheuvel ((((data) & 0x000000ff) << 24) | \ 306ad1fe5dSArd Biesheuvel (((data) & 0x0000ff00) << 8) | \ 316ad1fe5dSArd Biesheuvel (((data) & 0x00ff0000) >> 8) | \ 326ad1fe5dSArd Biesheuvel (((data) & 0xff000000) >> 24)) 33a2c1d73bSMark Rutland #else 346ad1fe5dSArd Biesheuvel #define DATA_LE32(data) ((data) & 0xffffffff) 35a2c1d73bSMark Rutland #endif 36a2c1d73bSMark Rutland 376ad1fe5dSArd Biesheuvel #define DEFINE_IMAGE_LE64(sym, data) \ 386ad1fe5dSArd Biesheuvel sym##_lo32 = DATA_LE32((data) & 0xffffffff); \ 396ad1fe5dSArd Biesheuvel sym##_hi32 = DATA_LE32((data) >> 32) 406ad1fe5dSArd Biesheuvel 41f56063c5SAKASHI Takahiro #define __HEAD_FLAG(field) (__HEAD_FLAG_##field << \ 42f56063c5SAKASHI Takahiro ARM64_IMAGE_FLAG_##field##_SHIFT) 43f56063c5SAKASHI Takahiro 44a2c1d73bSMark Rutland #ifdef CONFIG_CPU_BIG_ENDIAN 45f56063c5SAKASHI Takahiro #define __HEAD_FLAG_BE ARM64_IMAGE_FLAG_BE 46a2c1d73bSMark Rutland #else 47f56063c5SAKASHI Takahiro #define __HEAD_FLAG_BE ARM64_IMAGE_FLAG_LE 48a2c1d73bSMark Rutland #endif 49a2c1d73bSMark Rutland 509d372c9fSArd Biesheuvel #define __HEAD_FLAG_PAGE_SIZE ((PAGE_SHIFT - 10) / 2) 519d372c9fSArd Biesheuvel 52a7f8de16SArd Biesheuvel #define __HEAD_FLAG_PHYS_BASE 1 53a7f8de16SArd Biesheuvel 54f56063c5SAKASHI Takahiro #define __HEAD_FLAGS (__HEAD_FLAG(BE) | \ 55f56063c5SAKASHI Takahiro __HEAD_FLAG(PAGE_SIZE) | \ 56f56063c5SAKASHI Takahiro __HEAD_FLAG(PHYS_BASE)) 57a2c1d73bSMark Rutland 58a2c1d73bSMark Rutland /* 59a2c1d73bSMark Rutland * These will output as part of the Image header, which should be little-endian 60a2c1d73bSMark Rutland * regardless of the endianness of the kernel. While constant values could be 61a2c1d73bSMark Rutland * endian swapped in head.S, all are done here for consistency. 62a2c1d73bSMark Rutland */ 63a2c1d73bSMark Rutland #define HEAD_SYMBOLS \ 646ad1fe5dSArd Biesheuvel DEFINE_IMAGE_LE64(_kernel_size_le, _end - _text); \ 656ad1fe5dSArd Biesheuvel DEFINE_IMAGE_LE64(_kernel_flags_le, __HEAD_FLAGS); 66a2c1d73bSMark Rutland 67f56063c5SAKASHI Takahiro #endif /* __ARM64_KERNEL_IMAGE_H */ 68