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 */ 27