1*5e3eaea3SApple OSS Distributions /* 2*5e3eaea3SApple OSS Distributions * Copyright (c) 2019-2022 Apple Inc. All rights reserved. 3*5e3eaea3SApple OSS Distributions * 4*5e3eaea3SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5*5e3eaea3SApple OSS Distributions * 6*5e3eaea3SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code 7*5e3eaea3SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License 8*5e3eaea3SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in 9*5e3eaea3SApple OSS Distributions * compliance with the License. The rights granted to you under the License 10*5e3eaea3SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of, 11*5e3eaea3SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to 12*5e3eaea3SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any 13*5e3eaea3SApple OSS Distributions * terms of an Apple operating system software license agreement. 14*5e3eaea3SApple OSS Distributions * 15*5e3eaea3SApple OSS Distributions * Please obtain a copy of the License at 16*5e3eaea3SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file. 17*5e3eaea3SApple OSS Distributions * 18*5e3eaea3SApple OSS Distributions * The Original Code and all software distributed under the License are 19*5e3eaea3SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20*5e3eaea3SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21*5e3eaea3SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22*5e3eaea3SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23*5e3eaea3SApple OSS Distributions * Please see the License for the specific language governing rights and 24*5e3eaea3SApple OSS Distributions * limitations under the License. 25*5e3eaea3SApple OSS Distributions * 26*5e3eaea3SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27*5e3eaea3SApple OSS Distributions */ 28*5e3eaea3SApple OSS Distributions 29*5e3eaea3SApple OSS Distributions #include <darwintest.h> 30*5e3eaea3SApple OSS Distributions #include <pthread.h> 31*5e3eaea3SApple OSS Distributions #include <sys/types.h> 32*5e3eaea3SApple OSS Distributions #include <sys/sysctl.h> 33*5e3eaea3SApple OSS Distributions 34*5e3eaea3SApple OSS Distributions T_GLOBAL_META( 35*5e3eaea3SApple OSS Distributions T_META_NAMESPACE("xnu.arm"), 36*5e3eaea3SApple OSS Distributions T_META_RADAR_COMPONENT_NAME("xnu"), 37*5e3eaea3SApple OSS Distributions T_META_RADAR_COMPONENT_VERSION("arm"), 38*5e3eaea3SApple OSS Distributions T_META_OWNER("joster"), 39*5e3eaea3SApple OSS Distributions T_META_REQUIRES_SYSCTL_EQ("hw.optional.arm_kernel_protect", 0), // entitlement will crash on arm_kernel_protect devices 40*5e3eaea3SApple OSS Distributions T_META_RUN_CONCURRENTLY(true)); 41*5e3eaea3SApple OSS Distributions 42*5e3eaea3SApple OSS Distributions T_DECL(x18_entitled, 43*5e3eaea3SApple OSS Distributions "Test that x18 is preserved on hardware that supports it, if entitled.") 44*5e3eaea3SApple OSS Distributions { 45*5e3eaea3SApple OSS Distributions #ifndef __arm64__ 46*5e3eaea3SApple OSS Distributions T_SKIP("Running on non-arm64 target, skipping..."); 47*5e3eaea3SApple OSS Distributions #else 48*5e3eaea3SApple OSS Distributions uint64_t x18_val; 49*5e3eaea3SApple OSS Distributions for (uint64_t i = 0xFEEDB0B000000000ULL; i < 0xFEEDB0B000000000ULL + 10000; ++i) { 50*5e3eaea3SApple OSS Distributions asm volatile ("mov x18, %0" : : "r"(i)); 51*5e3eaea3SApple OSS Distributions sched_yield(); 52*5e3eaea3SApple OSS Distributions asm volatile ("mov %0, x18" : "=r"(x18_val)); 53*5e3eaea3SApple OSS Distributions T_QUIET; T_ASSERT_EQ(x18_val, i, "check that x18 reads back correctly after yield"); 54*5e3eaea3SApple OSS Distributions } 55*5e3eaea3SApple OSS Distributions #endif 56*5e3eaea3SApple OSS Distributions } 57