cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

compiler.h (850B)

      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/*
     12 * The EL0/EL1 pointer bits used by a pointer authentication code.
     13 * This is dependent on TBI0/TBI1 being enabled, or bits 63:56 would also apply.
     14 */
     15#define ptrauth_user_pac_mask()		GENMASK_ULL(54, vabits_actual)
     16#define ptrauth_kernel_pac_mask()	GENMASK_ULL(63, vabits_actual)
     17
     18/* Valid for EL0 TTBR0 and EL1 TTBR1 instruction pointers */
     19#define ptrauth_clear_pac(ptr)						\
     20	((ptr & BIT_ULL(55)) ? (ptr | ptrauth_kernel_pac_mask()) :	\
     21			       (ptr & ~ptrauth_user_pac_mask()))
     22
     23#define __builtin_return_address(val)					\
     24	(void *)(ptrauth_clear_pac((unsigned long)__builtin_return_address(val)))
     25
     26#endif /* __ASM_COMPILER_H */