| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 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 */ |