arch/arm64/include/asm/compiler.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_COMPILER_H
   3 #define __ASM_COMPILER_H
   4
   5 #ifdef ARM64_ASM_ARCH
   6 #define ARM64_ASM_PREAMBLE ".arch " ARM64_ASM_ARCH "\n"
   7 #else
   8 #define ARM64_ASM_PREAMBLE
   9 #endif
  10
  11 #define xpaclri(ptr)                                                    \
  12 ({                                                                      \
  13         register unsigned long __xpaclri_ptr asm("x30") = (ptr);        \
  14                                                                         \
  15         asm(                                                            \
  16         ARM64_ASM_PREAMBLE                                              \
  17         "       hint    #7\n"                                           \
  18         : "+r" (__xpaclri_ptr));                                        \
  19                                                                         \
  20         __xpaclri_ptr;                                                  \
  21 })
  22
  23 #ifdef CONFIG_ARM64_PTR_AUTH_KERNEL
  24 #define ptrauth_strip_kernel_insn_pac(ptr)      xpaclri(ptr)
  25 #else
  26 #define ptrauth_strip_kernel_insn_pac(ptr)      (ptr)
  27 #endif
  28
  29 #ifdef CONFIG_ARM64_PTR_AUTH
  30 #define ptrauth_strip_user_insn_pac(ptr)        xpaclri(ptr)
  31 #else
  32 #define ptrauth_strip_user_insn_pac(ptr)        (ptr)
  33 #endif
  34
  35 #if !defined(CONFIG_BUILTIN_RETURN_ADDRESS_STRIPS_PAC)
  36 #define __builtin_return_address(val)                                   \
  37         (void *)(ptrauth_strip_kernel_insn_pac((unsigned long)__builtin_return_address(val)))
  38 #endif
  39
  40 #endif /* __ASM_COMPILER_H */