| 1 |
|
| 2 | |
| 3 | * Linker script macros to generate Image header fields.
|
| 4 | *
|
| 5 | * Copyright (C) 2014 ARM Ltd.
|
| 6 |
|
| 7 | #ifndef __ARM64_KERNEL_IMAGE_H
|
| 8 | #define __ARM64_KERNEL_IMAGE_H
|
| 9 |
|
| 10 | #ifndef LINKER_SCRIPT
|
| 11 | #error This file should only be included in vmlinux.lds.S
|
| 12 | #endif
|
| 13 |
|
| 14 | #include <asm/image.h>
|
| 15 |
|
| 16 | |
| 17 | * There aren't any ELF relocations we can use to endian-swap values known only
|
| 18 | * at link time (e.g. the subtraction of two symbol addresses), so we must get
|
| 19 | * the linker to endian-swap certain values before emitting them.
|
| 20 | *
|
| 21 | * Note that, in order for this to work when building the ELF64 PIE executable
|
| 22 | * (for KASLR), these values should not be referenced via R_AARCH64_ABS64
|
| 23 | * relocations, since these are fixed up at runtime rather than at build time
|
| 24 | * when PIE is in effect. So we need to split them up in 32-bit high and low
|
| 25 | * words.
|
| 26 |
|
| 27 | #define DEFINE_IMAGE_LE64(sym, data) \
|
| 28 | sym##_lo32 = (data) & 0xffffffff; \
|
| 29 | sym##_hi32 = (data) >> 32
|
| 30 |
|
| 31 | #define __HEAD_FLAG(field) (__HEAD_FLAG_##field << \
|
| 32 | ARM64_IMAGE_FLAG_##field##_SHIFT)
|
| 33 |
|
| 34 | #define __HEAD_FLAG_BE ARM64_IMAGE_FLAG_LE
|
| 35 |
|
| 36 | #define __HEAD_FLAG_PAGE_SIZE ((PAGE_SHIFT - 10) / 2)
|
| 37 |
|
| 38 | #define __HEAD_FLAG_PHYS_BASE 1
|
| 39 |
|
| 40 | #define __HEAD_FLAGS (__HEAD_FLAG(BE) | \
|
| 41 | __HEAD_FLAG(PAGE_SIZE) | \
|
| 42 | __HEAD_FLAG(PHYS_BASE))
|
| 43 |
|
| 44 | |
| 45 | * These will output as part of the Image header, which should be little-endian
|
| 46 | * regardless of the endianness of the kernel. While constant values could be
|
| 47 | * endian swapped in head.S, all are done here for consistency.
|
| 48 |
|
| 49 | #define HEAD_SYMBOLS \
|
| 50 | DEFINE_IMAGE_LE64(_kernel_size_le, _end - _text); \
|
| 51 | DEFINE_IMAGE_LE64(_kernel_flags_le, __HEAD_FLAGS);
|
| 52 |
|
| 53 | #endif
|