1 /* 2 * (C) Copyright 2017 NVIDIA Corporation <www.nvidia.com> 3 * 4 * Derived from Linux kernel v4.14 files: 5 * 6 * arch/arm64/include/asm/assembler.h: 7 * Based on arch/arm/include/asm/assembler.h, arch/arm/mm/proc-macros.S 8 * Copyright (C) 1996-2000 Russell King 9 * Copyright (C) 2012 ARM Ltd. 10 * 11 * arch/arm64/kernel/head.S: 12 * Based on arch/arm/kernel/head.S 13 * Copyright (C) 1994-2002 Russell King 14 * Copyright (C) 2003-2012 ARM Ltd. 15 * Authors: Catalin Marinas <catalin.marinas@arm.com> 16 * Will Deacon <will.deacon@arm.com> 17 * 18 * arch/arm64/kernel/image.h: 19 * Copyright (C) 2014 ARM Ltd. 20 * 21 * SPDX-License-Identifier: GPL-2.0 22 */ 23 24 /* 25 * There aren't any ELF relocations we can use to endian-swap values known only 26 * at link time (e.g. the subtraction of two symbol addresses), so we must get 27 * the linker to endian-swap certain values before emitting them. 28 * 29 * Note that, in order for this to work when building the ELF64 PIE executable 30 * (for KASLR), these values should not be referenced via R_AARCH64_ABS64 31 * relocations, since these are fixed up at runtime rather than at build time 32 * when PIE is in effect. So we need to split them up in 32-bit high and low 33 * words. 34 */ 35 #ifdef CONFIG_CPU_BIG_ENDIAN 36 #define DATA_LE32(data) \ 37 ((((data) & 0x000000ff) << 24) | \ 38 (((data) & 0x0000ff00) << 8) | \ 39 (((data) & 0x00ff0000) >> 8) | \ 40 (((data) & 0xff000000) >> 24)) 41 #else 42 #define DATA_LE32(data) ((data) & 0xffffffff) 43 #endif 44 45 #define DEFINE_IMAGE_LE64(sym, data) \ 46 sym##_lo32 = DATA_LE32((data) & 0xffffffff); \ 47 sym##_hi32 = DATA_LE32((data) >> 32) 48 49 #define __MAX(a, b) (((a) > (b)) ? (a) : (b)) 50 #define __CODE_DATA_SIZE (__bss_start - _start) 51 #define __BSS_SIZE (__bss_end - __bss_start) 52 #ifdef CONFIG_SYS_INIT_SP_BSS_OFFSET 53 #define __MAX_EXTRA_RAM_USAGE __MAX(__BSS_SIZE, CONFIG_SYS_INIT_SP_BSS_OFFSET) 54 #else 55 #define __MAX_EXTRA_RAM_USAGE __BSS_SIZE 56 #endif 57 #define __MEM_USAGE (__CODE_DATA_SIZE + __MAX_EXTRA_RAM_USAGE) 58 59 #ifdef CONFIG_CPU_BIG_ENDIAN 60 #define __HEAD_FLAG_BE 1 61 #else 62 #define __HEAD_FLAG_BE 0 63 #endif 64 65 #define __HEAD_FLAG_PAGE_SIZE 1 /* 4K hard-coded */ 66 67 #define __HEAD_FLAG_PHYS_BASE 1 68 69 #define __HEAD_FLAGS ((__HEAD_FLAG_BE << 0) | \ 70 (__HEAD_FLAG_PAGE_SIZE << 1) | \ 71 (__HEAD_FLAG_PHYS_BASE << 3)) 72 73 #define TEXT_OFFSET (CONFIG_SYS_TEXT_BASE - \ 74 CONFIG_LNX_KRNL_IMG_TEXT_OFFSET_BASE) 75 76 /* 77 * These will output as part of the Image header, which should be little-endian 78 * regardless of the endianness of the kernel. While constant values could be 79 * endian swapped in head.S, all are done here for consistency. 80 */ 81 #define HEAD_SYMBOLS \ 82 DEFINE_IMAGE_LE64(_kernel_size_le, __MEM_USAGE); \ 83 DEFINE_IMAGE_LE64(_kernel_offset_le, TEXT_OFFSET); \ 84 DEFINE_IMAGE_LE64(_kernel_flags_le, __HEAD_FLAGS); 85 86 HEAD_SYMBOLS 87