| /* | |
| * Helper for pauth test case | |
| * | |
| * Copyright (c) 2023 Linaro Ltd | |
| * SPDX-License-Identifier: GPL-2.0-or-later | |
| */ | |
| #include <assert.h> | |
| #include <sys/auxv.h> | |
| static int get_pac_feature(void) | |
| { | |
| unsigned long isar1, isar2; | |
| assert(getauxval(AT_HWCAP) & HWCAP_CPUID); | |
| asm("mrs %0, id_aa64isar1_el1" : "=r"(isar1)); | |
| asm("mrs %0, S3_0_C0_C6_2" : "=r"(isar2)); /* id_aa64isar2_el1 */ | |
| return ((isar1 >> 4) & 0xf) /* APA */ | |
| | ((isar1 >> 8) & 0xf) /* API */ | |
| | ((isar2 >> 12) & 0xf); /* APA3 */ | |
| } |