1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_COMPILER_H
3 #define __ASM_COMPILER_H
5 #if defined(CONFIG_ARM64_PTR_AUTH)
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.
11 #define ptrauth_user_pac_mask() GENMASK_ULL(54, vabits_actual)
12 #define ptrauth_kernel_pac_mask() GENMASK_ULL(63, vabits_actual)
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()))
19 #define __builtin_return_address(val) \
20 (void *)(ptrauth_clear_pac((unsigned long)__builtin_return_address(val)))
22 #endif /* CONFIG_ARM64_PTR_AUTH */
24 #endif /* __ASM_COMPILER_H */