1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_COMPILER_H 3 #define __ASM_COMPILER_H 4 5 #if defined(CONFIG_ARM64_PTR_AUTH) 6 7 /* 8 * The EL0/EL1 pointer bits used by a pointer authentication code. 9 * This is dependent on TBI0/TBI1 being enabled, or bits 63:56 would also apply. 10 */ 11 #define ptrauth_user_pac_mask() GENMASK_ULL(54, vabits_actual) 12 #define ptrauth_kernel_pac_mask() GENMASK_ULL(63, vabits_actual) 13 14 /* Valid for EL0 TTBR0 and EL1 TTBR1 instruction pointers */ 15 #define ptrauth_clear_pac(ptr) \ 16 ((ptr & BIT_ULL(55)) ? (ptr | ptrauth_kernel_pac_mask()) : \ 17 (ptr & ~ptrauth_user_pac_mask())) 18 19 #define __builtin_return_address(val) \ 20 (void *)(ptrauth_clear_pac((unsigned long)__builtin_return_address(val))) 21 22 #endif /* CONFIG_ARM64_PTR_AUTH */ 23 24 #endif /* __ASM_COMPILER_H */ 25