arch/arm64/include/asm/hyp_image.h

   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__ */