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__ */ 69