/* * (C) Copyright 2017 NVIDIA Corporation <www.nvidia.com> * * Derived from Linux kernel v4.14 files: * * arch/arm64/include/asm/assembler.h: * Based on arch/arm/include/asm/assembler.h, arch/arm/mm/proc-macros.S * Copyright (C) 1996-2000 Russell King * Copyright (C) 2012 ARM Ltd. * * arch/arm64/kernel/head.S: * Based on arch/arm/kernel/head.S * Copyright (C) 1994-2002 Russell King * Copyright (C) 2003-2012 ARM Ltd. * Authors: Catalin Marinas <catalin.marinas@arm.com> * Will Deacon <will.deacon@arm.com> * * arch/arm64/kernel/image.h: * Copyright (C) 2014 ARM Ltd. * * SPDX-License-Identifier: GPL-2.0 */ /* * 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 __MAX(a, b) (((a) > (b)) ? (a) : (b)) #define __CODE_DATA_SIZE (__bss_start - _start) #define __BSS_SIZE (__bss_end - __bss_start) #ifdef CONFIG_SYS_INIT_SP_BSS_OFFSET #define __MAX_EXTRA_RAM_USAGE __MAX(__BSS_SIZE, CONFIG_SYS_INIT_SP_BSS_OFFSET) #else #define __MAX_EXTRA_RAM_USAGE __BSS_SIZE #endif #define __MEM_USAGE (__CODE_DATA_SIZE + __MAX_EXTRA_RAM_USAGE) #ifdef CONFIG_CPU_BIG_ENDIAN #define __HEAD_FLAG_BE 1 #else #define __HEAD_FLAG_BE 0 #endif #define __HEAD_FLAG_PAGE_SIZE 1 /* 4K hard-coded */ #define __HEAD_FLAG_PHYS_BASE 1 #define __HEAD_FLAGS ((__HEAD_FLAG_BE << 0) | \ (__HEAD_FLAG_PAGE_SIZE << 1) | \ (__HEAD_FLAG_PHYS_BASE << 3)) #define TEXT_OFFSET (CONFIG_SYS_TEXT_BASE - \ CONFIG_LNX_KRNL_IMG_TEXT_OFFSET_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, __MEM_USAGE); \ DEFINE_IMAGE_LE64(_kernel_offset_le, TEXT_OFFSET); \ DEFINE_IMAGE_LE64(_kernel_flags_le, __HEAD_FLAGS); HEAD_SYMBOLS