1*871a7f6aSRichard Henderson /* 2*871a7f6aSRichard Henderson * Helper for pauth test case 3*871a7f6aSRichard Henderson * 4*871a7f6aSRichard Henderson * Copyright (c) 2023 Linaro Ltd 5*871a7f6aSRichard Henderson * SPDX-License-Identifier: GPL-2.0-or-later 6*871a7f6aSRichard Henderson */ 7*871a7f6aSRichard Henderson 8*871a7f6aSRichard Henderson #include <assert.h> 9*871a7f6aSRichard Henderson #include <sys/auxv.h> 10*871a7f6aSRichard Henderson get_pac_feature(void)11*871a7f6aSRichard Hendersonstatic int get_pac_feature(void) 12*871a7f6aSRichard Henderson { 13*871a7f6aSRichard Henderson unsigned long isar1, isar2; 14*871a7f6aSRichard Henderson 15*871a7f6aSRichard Henderson assert(getauxval(AT_HWCAP) & HWCAP_CPUID); 16*871a7f6aSRichard Henderson 17*871a7f6aSRichard Henderson asm("mrs %0, id_aa64isar1_el1" : "=r"(isar1)); 18*871a7f6aSRichard Henderson asm("mrs %0, S3_0_C0_C6_2" : "=r"(isar2)); /* id_aa64isar2_el1 */ 19*871a7f6aSRichard Henderson 20*871a7f6aSRichard Henderson return ((isar1 >> 4) & 0xf) /* APA */ 21*871a7f6aSRichard Henderson | ((isar1 >> 8) & 0xf) /* API */ 22*871a7f6aSRichard Henderson | ((isar2 >> 12) & 0xf); /* APA3 */ 23*871a7f6aSRichard Henderson } 24