1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Copyright (C) 2020 Google LLC.
 4 * Written by David Brazdil <dbrazdil@google.com>
 5 */
 6
 7#ifndef __ARM64_HYP_IMAGE_H__
 8#define __ARM64_HYP_IMAGE_H__
 9
10#define __HYP_CONCAT(a, b)	a ## b
11#define HYP_CONCAT(a, b)	__HYP_CONCAT(a, b)
12
13#ifndef __KVM_NVHE_HYPERVISOR__
14/*
15 * KVM nVHE code has its own symbol namespace prefixed with __kvm_nvhe_,
16 * to separate it from the kernel proper.
17 */
18#define kvm_nvhe_sym(sym)	__kvm_nvhe_##sym
19#else
20#define kvm_nvhe_sym(sym)	sym
21#endif
22
23#ifdef LINKER_SCRIPT
24
25/*
26 * KVM nVHE ELF section names are prefixed with .hyp, to separate them
27 * from the kernel proper.
28 */
29#define HYP_SECTION_NAME(NAME)	.hyp##NAME
30
31/* Symbol defined at the beginning of each hyp section. */
32#define HYP_SECTION_SYMBOL_NAME(NAME) \
33	HYP_CONCAT(__hyp_section_, HYP_SECTION_NAME(NAME))
34
35/*
36 * Helper to generate linker script statements starting a hyp section.
37 *
38 * A symbol with a well-known name is defined at the first byte. This
39 * is used as a base for hyp relocations (see gen-hyprel.c). It must
40 * be defined inside the section so the linker of `vmlinux` cannot
41 * separate it from the section data.
42 */
43#define BEGIN_HYP_SECTION(NAME)				\
44	HYP_SECTION_NAME(NAME) : {			\
45		HYP_SECTION_SYMBOL_NAME(NAME) = .;
46
47/* Helper to generate linker script statements ending a hyp section. */
48#define END_HYP_SECTION					\
49	}
50
51/* Defines an ELF hyp section from input section @NAME and its subsections. */
52#define HYP_SECTION(NAME)			\
53	BEGIN_HYP_SECTION(NAME)			\
54		*(NAME NAME##.*)		\
55	END_HYP_SECTION
56
57/*
58 * Defines a linker script alias of a kernel-proper symbol referenced by
59 * KVM nVHE hyp code.
60 */
61#define KVM_NVHE_ALIAS(sym)	kvm_nvhe_sym(sym) = sym;
62
63/* Defines a linker script alias for KVM nVHE hyp symbols */
64#define KVM_NVHE_ALIAS_HYP(first, sec)	kvm_nvhe_sym(first) = kvm_nvhe_sym(sec);
65
66#endif /* LINKER_SCRIPT */
67
68#endif /* __ARM64_HYP_IMAGE_H__ */