Merge branch 'for-next/kernel-ptrauth' into for-next/core
[linux-2.6-microblaze.git] / 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 #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 */