| Tom Rini | 10e4779 | 2018-05-06 17:58:06 -0400 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| Stephen Warren | 80a9365 | 2018-01-03 14:31:51 -0700 | [diff] [blame] | 2 | /* |
| 3 | * (C) Copyright 2017 NVIDIA Corporation <www.nvidia.com> |
| 4 | * |
| 5 | * Derived from Linux kernel v4.14 files: |
| 6 | * |
| 7 | * arch/arm64/include/asm/assembler.h: |
| 8 | * Based on arch/arm/include/asm/assembler.h, arch/arm/mm/proc-macros.S |
| 9 | * Copyright (C) 1996-2000 Russell King |
| 10 | * Copyright (C) 2012 ARM Ltd. |
| 11 | * |
| 12 | * arch/arm64/kernel/head.S: |
| 13 | * Based on arch/arm/kernel/head.S |
| 14 | * Copyright (C) 1994-2002 Russell King |
| 15 | * Copyright (C) 2003-2012 ARM Ltd. |
| 16 | * Authors: Catalin Marinas <catalin.marinas@arm.com> |
| 17 | * Will Deacon <will.deacon@arm.com> |
| 18 | * |
| 19 | * arch/arm64/kernel/image.h: |
| 20 | * Copyright (C) 2014 ARM Ltd. |
| Stephen Warren | 80a9365 | 2018-01-03 14:31:51 -0700 | [diff] [blame] | 21 | */ |
| 22 | |
| 23 | /* |
| 24 | * There aren't any ELF relocations we can use to endian-swap values known only |
| 25 | * at link time (e.g. the subtraction of two symbol addresses), so we must get |
| 26 | * the linker to endian-swap certain values before emitting them. |
| 27 | * |
| 28 | * Note that, in order for this to work when building the ELF64 PIE executable |
| 29 | * (for KASLR), these values should not be referenced via R_AARCH64_ABS64 |
| 30 | * relocations, since these are fixed up at runtime rather than at build time |
| 31 | * when PIE is in effect. So we need to split them up in 32-bit high and low |
| 32 | * words. |
| 33 | */ |
| 34 | #ifdef CONFIG_CPU_BIG_ENDIAN |
| 35 | #define DATA_LE32(data) \ |
| 36 | ((((data) & 0x000000ff) << 24) | \ |
| 37 | (((data) & 0x0000ff00) << 8) | \ |
| 38 | (((data) & 0x00ff0000) >> 8) | \ |
| 39 | (((data) & 0xff000000) >> 24)) |
| 40 | #else |
| 41 | #define DATA_LE32(data) ((data) & 0xffffffff) |
| 42 | #endif |
| 43 | |
| 44 | #define DEFINE_IMAGE_LE64(sym, data) \ |
| 45 | sym##_lo32 = DATA_LE32((data) & 0xffffffff); \ |
| 46 | sym##_hi32 = DATA_LE32((data) >> 32) |
| 47 | |
| 48 | #define __MAX(a, b) (((a) > (b)) ? (a) : (b)) |
| 49 | #define __CODE_DATA_SIZE (__bss_start - _start) |
| 50 | #define __BSS_SIZE (__bss_end - __bss_start) |
| 51 | #ifdef CONFIG_SYS_INIT_SP_BSS_OFFSET |
| 52 | #define __MAX_EXTRA_RAM_USAGE __MAX(__BSS_SIZE, CONFIG_SYS_INIT_SP_BSS_OFFSET) |
| 53 | #else |
| 54 | #define __MAX_EXTRA_RAM_USAGE __BSS_SIZE |
| 55 | #endif |
| 56 | #define __MEM_USAGE (__CODE_DATA_SIZE + __MAX_EXTRA_RAM_USAGE) |
| 57 | |
| 58 | #ifdef CONFIG_CPU_BIG_ENDIAN |
| 59 | #define __HEAD_FLAG_BE 1 |
| 60 | #else |
| 61 | #define __HEAD_FLAG_BE 0 |
| 62 | #endif |
| 63 | |
| 64 | #define __HEAD_FLAG_PAGE_SIZE 1 /* 4K hard-coded */ |
| 65 | |
| 66 | #define __HEAD_FLAG_PHYS_BASE 1 |
| 67 | |
| 68 | #define __HEAD_FLAGS ((__HEAD_FLAG_BE << 0) | \ |
| 69 | (__HEAD_FLAG_PAGE_SIZE << 1) | \ |
| 70 | (__HEAD_FLAG_PHYS_BASE << 3)) |
| 71 | |
| 72 | #define TEXT_OFFSET (CONFIG_SYS_TEXT_BASE - \ |
| 73 | CONFIG_LNX_KRNL_IMG_TEXT_OFFSET_BASE) |
| 74 | |
| 75 | /* |
| 76 | * These will output as part of the Image header, which should be little-endian |
| 77 | * regardless of the endianness of the kernel. While constant values could be |
| 78 | * endian swapped in head.S, all are done here for consistency. |
| 79 | */ |
| 80 | #define HEAD_SYMBOLS \ |
| 81 | DEFINE_IMAGE_LE64(_kernel_size_le, __MEM_USAGE); \ |
| 82 | DEFINE_IMAGE_LE64(_kernel_offset_le, TEXT_OFFSET); \ |
| 83 | DEFINE_IMAGE_LE64(_kernel_flags_le, __HEAD_FLAGS); |
| 84 | |
| 85 | HEAD_SYMBOLS |