1 /* 2 * Copyright (c) 2021 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 /** 29 * On devices that support it, this test ensures that PSTATE.SSBS is set by 30 * default and is writeable by userspace. 31 */ 32 #include <darwintest.h> 33 #include <stdbool.h> 34 #include <stdint.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <mach/mach.h> 38 #include <mach/thread_status.h> 39 #include <sys/sysctl.h> 40 #include <inttypes.h> 41 42 43 T_GLOBAL_META( 44 T_META_RADAR_COMPONENT_NAME("xnu"), 45 T_META_RADAR_COMPONENT_VERSION("arm"), 46 T_META_OWNER("dmitry_grinberg"), 47 T_META_RUN_CONCURRENTLY(true)); 48 49 50 #define PSR64_SSBS (0x1000) 51 #define REG_SSBS "S3_3_C4_C2_6" /* clang will not emit MRS/MSR to "SSBS" itself since it doesnt always exist */ 52 53 T_DECL(armv85_ssbs, 54 "Test that ARMv8.5 SSBS is off by default (PSTATE.SSBS==1, don't ask!) and can be enabled by userspace.", T_META_TAG_VM_NOT_ELIGIBLE) 55 { 56 #ifndef __arm64__ 57 T_SKIP("Running on non-arm64 target, skipping..."); 58 #else 59 uint32_t ssbs_support = 19180; 60 size_t ssbs_support_len = sizeof(ssbs_support); 61 if (sysctlbyname("hw.optional.arm.FEAT_SSBS", &ssbs_support, &ssbs_support_len, NULL, 0)) { 62 T_SKIP("Could not get SSBS support sysctl, skipping..."); 63 } else if (!ssbs_support) { 64 T_SKIP("HW has no SSBS support, skipping..."); 65 } else if (ssbs_support != 1) { 66 T_FAIL("SSBS support sysctl contains garbage: %u!", ssbs_support); 67 } else { 68 uint64_t ssbs_state = __builtin_arm_rsr64(REG_SSBS); 69 70 if (!(ssbs_state & PSR64_SSBS)) { 71 T_FAIL("SSBS does not default to off (value seen: 0x%" PRIx64 ")!", ssbs_state); 72 } 73 74 __builtin_arm_wsr64(REG_SSBS, 0); 75 ssbs_state = __builtin_arm_rsr64(REG_SSBS); 76 77 if (ssbs_state & PSR64_SSBS) { 78 T_FAIL("SSBS did not turn on (value seen: 0x%" PRIx64 ")!", ssbs_state); 79 } 80 81 __builtin_arm_wsr64(REG_SSBS, PSR64_SSBS); 82 ssbs_state = __builtin_arm_rsr64(REG_SSBS); 83 84 if (!(ssbs_state & PSR64_SSBS)) { 85 T_FAIL("SSBS did not turn off (value seen: 0x%" PRIx64 ")!", ssbs_state); 86 } 87 88 T_PASS("SSBS test passes"); 89 } 90 #endif /* __arm64__ */ 91 } 92