1*8d741a5dSApple OSS Distributions /* 2*8d741a5dSApple OSS Distributions * Copyright (c) 2019-2022 Apple Inc. All rights reserved. 3*8d741a5dSApple OSS Distributions * 4*8d741a5dSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*8d741a5dSApple OSS Distributions * 6*8d741a5dSApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*8d741a5dSApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*8d741a5dSApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*8d741a5dSApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*8d741a5dSApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*8d741a5dSApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*8d741a5dSApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*8d741a5dSApple OSS Distributions * terms of an Apple operating system software license agreement. 14*8d741a5dSApple OSS Distributions * 15*8d741a5dSApple OSS Distributions * Please obtain a copy of the License at 16*8d741a5dSApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*8d741a5dSApple OSS Distributions * 18*8d741a5dSApple OSS Distributions * The Original Code and all software distributed under the License are 19*8d741a5dSApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*8d741a5dSApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*8d741a5dSApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*8d741a5dSApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*8d741a5dSApple OSS Distributions * Please see the License for the specific language governing rights and 24*8d741a5dSApple OSS Distributions * limitations under the License. 25*8d741a5dSApple OSS Distributions * 26*8d741a5dSApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*8d741a5dSApple OSS Distributions */ 28*8d741a5dSApple OSS Distributions 29*8d741a5dSApple OSS Distributions #include <darwintest.h> 30*8d741a5dSApple OSS Distributions #include <pthread.h> 31*8d741a5dSApple OSS Distributions #include <sys/types.h> 32*8d741a5dSApple OSS Distributions #include <sys/sysctl.h> 33*8d741a5dSApple OSS Distributions 34*8d741a5dSApple OSS Distributions T_GLOBAL_META( 35*8d741a5dSApple OSS Distributions T_META_NAMESPACE("xnu.arm"), 36*8d741a5dSApple OSS Distributions T_META_RADAR_COMPONENT_NAME("xnu"), 37*8d741a5dSApple OSS Distributions T_META_RADAR_COMPONENT_VERSION("arm"), 38*8d741a5dSApple OSS Distributions T_META_OWNER("joster"), 39*8d741a5dSApple OSS Distributions T_META_REQUIRES_SYSCTL_EQ("hw.optional.arm_kernel_protect", 0), // entitlement will crash on arm_kernel_protect devices 40*8d741a5dSApple OSS Distributions T_META_RUN_CONCURRENTLY(true), 41*8d741a5dSApple OSS Distributions T_META_TAG_VM_PREFERRED); 42*8d741a5dSApple OSS Distributions 43*8d741a5dSApple OSS Distributions T_DECL(x18_entitled, 44*8d741a5dSApple OSS Distributions "Test that x18 is preserved on hardware that supports it, if entitled.") 45*8d741a5dSApple OSS Distributions { 46*8d741a5dSApple OSS Distributions #ifndef __arm64__ 47*8d741a5dSApple OSS Distributions T_SKIP("Running on non-arm64 target, skipping..."); 48*8d741a5dSApple OSS Distributions #else 49*8d741a5dSApple OSS Distributions uint64_t x18_val; 50*8d741a5dSApple OSS Distributions for (uint64_t i = 0xFEEDB0B000000000ULL; i < 0xFEEDB0B000000000ULL + 10000; ++i) { 51*8d741a5dSApple OSS Distributions asm volatile ("mov x18, %0" : : "r"(i)); 52*8d741a5dSApple OSS Distributions sched_yield(); 53*8d741a5dSApple OSS Distributions asm volatile ("mov %0, x18" : "=r"(x18_val)); 54*8d741a5dSApple OSS Distributions T_QUIET; T_ASSERT_EQ(x18_val, i, "check that x18 reads back correctly after yield"); 55*8d741a5dSApple OSS Distributions } 56*8d741a5dSApple OSS Distributions #endif 57*8d741a5dSApple OSS Distributions } 58