1 /* 2 * Helper for pauth test case 3 * 4 * Copyright (c) 2023 Linaro Ltd 5 * SPDX-License-Identifier: GPL-2.0-or-later 6 */ 7 8 #include <assert.h> 9 #include <sys/auxv.h> 10 11 static int get_pac_feature(void) 12 { 13 unsigned long isar1, isar2; 14 15 assert(getauxval(AT_HWCAP) & HWCAP_CPUID); 16 17 asm("mrs %0, id_aa64isar1_el1" : "=r"(isar1)); 18 asm("mrs %0, S3_0_C0_C6_2" : "=r"(isar2)); /* id_aa64isar2_el1 */ 19 20 return ((isar1 >> 4) & 0xf) /* APA */ 21 | ((isar1 >> 8) & 0xf) /* API */ 22 | ((isar2 >> 12) & 0xf); /* APA3 */ 23 } 24